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android / kernel / common / a37338aad8c4d8676173ead14e881d2ec308155c / . / Makefile
blob: c3f9bd191b8941e70c69569dc88466f38926d828 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +0100[diff] [blame]1# SPDX-License-Identifier: GPL-2.0
Linus Torvaldsbfeffd12019-01-06 17:08:20 -0800[diff] [blame]2VERSION = 5
Linus Torvaldse73f0f02021-07-11 15:07:40 -0700[diff] [blame]3PATCHLEVEL = 14
Linus Torvalds55922c9d2011-05-29 17:43:36 -0700[diff] [blame]4SUBLEVEL = 0
Linus Torvaldse73f0f02021-07-11 15:07:40 -0700[diff] [blame]5EXTRAVERSION = -rc1
Linus Torvalds13311e72021-06-20 15:03:15 -0700[diff] [blame]6NAME = Opossums on Parade
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]14$(if $(filter __%, $(MAKECMDGOALS)), \
15 $(error targets prefixed with '__' are only for internal use))
16
Masahiro Yamadaba634ec2017-10-04 12:56:05 +0900[diff] [blame]17# That's our default target when none is given on the command line
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]18PHONY := __all
19__all:
Masahiro Yamadaba634ec2017-10-04 12:56:05 +0900[diff] [blame]20
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]21# We are using a recursive build, so we need to do a little thinking
22# to get the ordering right.
23#
24# Most importantly: sub-Makefiles should only ever modify files in
25# their own directory. If in some directory we have a dependency on
26# a file in another dir (which doesn't happen often, but it's often
Nicholas Pigginf49821e2018-02-11 00:25:04 +1000[diff] [blame]27# unavoidable when linking the built-in.a targets which finally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]28# turn into vmlinux), we will call a sub make in that other dir, and
29# after that we are sure that everything which is in that other dir
30# is now up to date.
31#
32# The only cases where we need to modify files which have global
33# effects are thus separated out and done before the recursive
34# descending is started. They are now explicitly listed as the
35# prepare rule.
36
Masahiro Yamada221cc2d2019-03-26 13:02:19 +0900[diff] [blame]37ifneq ($(sub_make_done),1)
Masahiro Yamada3812b8c2019-02-22 16:40:07 +0900[diff] [blame]38
39# Do not use make's built-in rules and variables
40# (this increases performance and avoids hard-to-debug behaviour)
41MAKEFLAGS += -rR
42
43# Avoid funny character set dependencies
44unexport LC_ALL
45LC_COLLATE=C
46LC_NUMERIC=C
47export LC_COLLATE LC_NUMERIC
48
49# Avoid interference with shell env settings
50unexport GREP_OPTIONS
51
Michal Marek066b7ed2014-07-04 14:29:30 +0200[diff] [blame]52# Beautify output
53# ---------------------------------------------------------------------------
54#
55# Normally, we echo the whole command before executing it. By making
56# that echo $($(quiet)$(cmd)), we now have the possibility to set
57# $(quiet) to choose other forms of output instead, e.g.
58#
59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
61#
62# If $(quiet) is empty, the whole command will be printed.
63# If it is set to "quiet_", only the short version will be printed.
64# If it is set to "silent_", nothing will be printed at all, since
65# the variable $(silent_cmd_cc_o_c) doesn't exist.
66#
67# A simple variant is to prefix commands with $(Q) - that's useful
68# for commands that shall be hidden in non-verbose mode.
69#
70# $(Q)ln $@ :<
71#
72# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73# If KBUILD_VERBOSE equals 1 then the above command is displayed.
Randy Dunlap505b12b2020-02-12 20:40:57 -0800[diff] [blame]74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
Michal Marek066b7ed2014-07-04 14:29:30 +0200[diff] [blame]75#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]76# To put more focus on warnings, be less verbose as default
77# Use 'make V=1' to see the full commands
78
Cheng Renquanb8b06182009-05-26 16:03:07 +0800[diff] [blame]79ifeq ("$(origin V)", "command line")
80 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]81endif
82ifndef KBUILD_VERBOSE
83 KBUILD_VERBOSE = 0
84endif
85
Michal Marek066b7ed2014-07-04 14:29:30 +0200[diff] [blame]86ifeq ($(KBUILD_VERBOSE),1)
87 quiet =
88 Q =
89else
90 quiet=quiet_
91 Q = @
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96
Masahiro Yamada6f0fa582017-05-19 20:42:30 +0900[diff] [blame]97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
Michal Marek066b7ed2014-07-04 14:29:30 +0200[diff] [blame]98 quiet=silent_
Masahiro Yamada22149452021-02-27 15:26:20 +0900[diff] [blame]99 KBUILD_VERBOSE = 0
Michal Marek066b7ed2014-07-04 14:29:30 +0200[diff] [blame]100endif
Michal Marek066b7ed2014-07-04 14:29:30 +0200[diff] [blame]101
102export quiet Q KBUILD_VERBOSE
103
Masahiro Yamadabcf637f2021-02-22 01:53:06 +0900[diff] [blame]104# Call a source code checker (by default, "sparse") as part of the
105# C compilation.
106#
107# Use 'make C=1' to enable checking of only re-compiled files.
108# Use 'make C=2' to enable checking of *all* source files, regardless
109# of whether they are re-compiled or not.
110#
111# See the file "Documentation/dev-tools/sparse.rst" for more details,
112# including where to get the "sparse" utility.
113
114ifeq ("$(origin C)", "command line")
115 KBUILD_CHECKSRC = $(C)
116endif
117ifndef KBUILD_CHECKSRC
118 KBUILD_CHECKSRC = 0
119endif
120
121export KBUILD_CHECKSRC
122
123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124# directory of external module to build. Setting M= takes precedence.
125ifeq ("$(origin M)", "command line")
126 KBUILD_EXTMOD := $(M)
127endif
128
129$(if $(word 2, $(KBUILD_EXTMOD)), \
130 $(error building multiple external modules is not supported))
131
Masahiro Yamada74ee5852021-06-02 23:02:13 +0900[diff] [blame]132# Remove trailing slashes
133ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
135endif
136
Masahiro Yamadabcf637f2021-02-22 01:53:06 +0900[diff] [blame]137export KBUILD_EXTMOD
138
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]139# Kbuild will save output files in the current working directory.
140# This does not need to match to the root of the kernel source tree.
141#
142# For example, you can do this:
143#
144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
145#
146# If you want to save output files in a different location, there are
147# two syntaxes to specify it.
148#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]149# 1) O=
150# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200[diff] [blame]151#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]152# 2) Set KBUILD_OUTPUT
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]153# Set the environment variable KBUILD_OUTPUT to point to the output directory.
154# export KBUILD_OUTPUT=dir/to/store/output/files/; make
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]155#
156# The O= assignment takes precedence over the KBUILD_OUTPUT environment
157# variable.
158
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]159# Do we want to change the working directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800[diff] [blame]160ifeq ("$(origin O)", "command line")
161 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]162endif
163
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]164ifneq ($(KBUILD_OUTPUT),)
165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
166# expand a shell special character '~'. We use a somewhat tedious way here.
167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
168$(if $(abs_objtree),, \
169 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
170
171# $(realpath ...) resolves symlinks
172abs_objtree := $(realpath $(abs_objtree))
173else
174abs_objtree := $(CURDIR)
175endif # ifneq ($(KBUILD_OUTPUT),)
176
177ifeq ($(abs_objtree),$(CURDIR))
178# Suppress "Entering directory ..." unless we are changing the work directory.
179MAKEFLAGS += --no-print-directory
180else
181need-sub-make := 1
Robert Jarzmik51193b72016-04-02 21:38:53 +0200[diff] [blame]182endif
183
Masahiro Yamada30cef682021-02-22 01:50:19 +0900[diff] [blame]184this-makefile := $(lastword $(MAKEFILE_LIST))
185abs_srctree := $(realpath $(dir $(this-makefile)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]186
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]187ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
188$(error source directory cannot contain spaces or colons)
189endif
190
191ifneq ($(abs_srctree),$(abs_objtree))
Masahiro Yamada80463f12018-09-14 15:33:23 +0900[diff] [blame]192# Look for make include files relative to root of kernel src
193#
194# This does not become effective immediately because MAKEFLAGS is re-parsed
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]195# once after the Makefile is read. We need to invoke sub-make.
196MAKEFLAGS += --include-dir=$(abs_srctree)
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]197need-sub-make := 1
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]198endif
Masahiro Yamada3812b8c2019-02-22 16:40:07 +0900[diff] [blame]199
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]200ifneq ($(filter 3.%,$(MAKE_VERSION)),)
201# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
202# We need to invoke sub-make to avoid implicit rules in the top Makefile.
203need-sub-make := 1
204# Cancel implicit rules for this Makefile.
Masahiro Yamada93fdddf2020-05-11 12:50:12 +0900[diff] [blame]205$(this-makefile): ;
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]206endif
207
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]208export abs_srctree abs_objtree
Masahiro Yamada221cc2d2019-03-26 13:02:19 +0900[diff] [blame]209export sub_make_done := 1
210
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]211ifeq ($(need-sub-make),1)
212
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]213PHONY += $(MAKECMDGOALS) __sub-make
Milton Miller0b357862007-09-21 18:09:02 -0500[diff] [blame]214
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]215$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100[diff] [blame]216 @:
Milton Miller0b357862007-09-21 18:09:02 -0500[diff] [blame]217
Cao jinc4e6fff2017-06-30 10:45:43 +0800[diff] [blame]218# Invoke a second make in the output directory, passing relevant variables
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]219__sub-make:
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]221
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]222endif # need-sub-make
Masahiro Yamada221cc2d2019-03-26 13:02:19 +0900[diff] [blame]223endif # sub_make_done
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]225# We process the rest of the Makefile if this is the final invocation of make
Masahiro Yamada688931a2019-03-19 13:02:36 +0900[diff] [blame]226ifeq ($(need-sub-make),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]227
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900[diff] [blame]228# Do not print "Entering directory ...",
229# but we want to display it when entering to the output directory
230# so that IDEs/editors are able to understand relative filenames.
231MAKEFLAGS += --no-print-directory
232
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]233ifeq ($(abs_srctree),$(abs_objtree))
Michal Marek9da07632014-04-25 23:25:18 +0200[diff] [blame]234 # building in the source tree
235 srctree := .
Masahiro Yamada051f2782019-07-06 12:07:12 +0900[diff] [blame]236 building_out_of_srctree :=
Michal Marek9da07632014-04-25 23:25:18 +0200[diff] [blame]237else
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
Michal Marek9da07632014-04-25 23:25:18 +0200[diff] [blame]239 # building in a subdirectory of the source tree
240 srctree := ..
241 else
Masahiro Yamada25b146c52019-03-30 21:04:14 +0900[diff] [blame]242 srctree := $(abs_srctree)
Michal Marek9da07632014-04-25 23:25:18 +0200[diff] [blame]243 endif
Masahiro Yamada051f2782019-07-06 12:07:12 +0900[diff] [blame]244 building_out_of_srctree := 1
Michal Marek9da07632014-04-25 23:25:18 +0200[diff] [blame]245endif
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]246
Masahiro Yamada95fd3f82019-07-06 12:07:13 +0900[diff] [blame]247ifneq ($(KBUILD_ABS_SRCTREE),)
248srctree := $(abs_srctree)
249endif
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]250
Michal Marek7e1c0472014-04-25 17:29:45 +0200[diff] [blame]251objtree := .
Masahiro Yamada6b12de62019-02-22 16:40:09 +0900[diff] [blame]252VPATH := $(srctree)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]253
Masahiro Yamada051f2782019-07-06 12:07:12 +0900[diff] [blame]254export building_out_of_srctree srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]255
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]256# To make sure we do not include .config for any of the *config targets
257# catch them early, and hand them over to scripts/kconfig/Makefile
258# It is allowed to specify more targets when calling make, including
259# mixing *config targets and build targets.
260# For example 'make oldconfig all'.
261# Detect when mixed targets is specified, and make a second invocation
262# of make so .config is not included in this case either (for *config).
263
264version_h := include/generated/uapi/linux/version.h
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]265
Masahiro Yamada22340a02018-02-11 17:40:29 +0900[diff] [blame]266clean-targets := %clean mrproper cleandocs
267no-dot-config-targets := $(clean-targets) \
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]268 cscope gtags TAGS tags help% %docs check% coccicheck \
Masahiro Yamada59b2bd02019-06-04 19:14:02 +0900[diff] [blame]269 $(version_h) headers headers_% archheaders archscripts \
David Engraf46239802020-03-26 20:29:33 +0100[diff] [blame]270 %asm-generic kernelversion %src-pkg dt_binding_check \
271 outputmakefile
Masahiro Yamada805b2e12021-02-28 15:10:28 +0900[diff] [blame]272# Installation targets should not require compiler. Unfortunately, vdso_install
273# is an exception where build artifacts may be updated. This must be fixed.
274no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
275 headers_install modules_install kernelrelease image_name
Masahiro Yamada993bdde2021-02-28 15:10:25 +0900[diff] [blame]276no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
277 image_name
Masahiro Yamada394053f2019-08-15 00:19:18 +0900[diff] [blame]278single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]279
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]280config-build :=
281mixed-build :=
282need-config := 1
Masahiro Yamada805b2e12021-02-28 15:10:28 +0900[diff] [blame]283need-compiler := 1
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]284may-sync-config := 1
Masahiro Yamada394053f2019-08-15 00:19:18 +0900[diff] [blame]285single-build :=
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]286
287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]289 need-config :=
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]290 endif
291endif
292
Masahiro Yamada805b2e12021-02-28 15:10:28 +0900[diff] [blame]293ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
295 need-compiler :=
296 endif
297endif
298
Masahiro Yamadad7942412018-07-20 16:46:34 +0900[diff] [blame]299ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]301 may-sync-config :=
Masahiro Yamadad7942412018-07-20 16:46:34 +0900[diff] [blame]302 endif
303endif
304
305ifneq ($(KBUILD_EXTMOD),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]306 may-sync-config :=
Masahiro Yamadad7942412018-07-20 16:46:34 +0900[diff] [blame]307endif
308
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]309ifeq ($(KBUILD_EXTMOD),)
Masahiro Yamadaefbf9722020-08-12 23:49:23 +0900[diff] [blame]310 ifneq ($(filter %config,$(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]311 config-build := 1
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]312 ifneq ($(words $(MAKECMDGOALS)),1)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]313 mixed-build := 1
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]314 endif
315 endif
316endif
Masahiro Yamada22340a02018-02-11 17:40:29 +0900[diff] [blame]317
Masahiro Yamada394053f2019-08-15 00:19:18 +0900[diff] [blame]318# We cannot build single targets and the others at the same time
319ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
320 single-build := 1
321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
322 mixed-build := 1
323 endif
324endif
325
Masahiro Yamada22340a02018-02-11 17:40:29 +0900[diff] [blame]326# For "make -j clean all", "make -j mrproper defconfig all", etc.
327ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]329 mixed-build := 1
Masahiro Yamada22340a02018-02-11 17:40:29 +0900[diff] [blame]330 endif
331endif
332
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]333# install and modules_install need also be processed one by one
334ifneq ($(filter install,$(MAKECMDGOALS)),)
335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]336 mixed-build := 1
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]337 endif
338endif
339
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]340ifdef mixed-build
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]341# ===========================================================================
342# We're called with mixed targets (*config and build targets).
343# Handle them one by one.
344
345PHONY += $(MAKECMDGOALS) __build_one_by_one
346
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]347$(MAKECMDGOALS): __build_one_by_one
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]348 @:
349
350__build_one_by_one:
351 $(Q)set -e; \
352 for i in $(MAKECMDGOALS); do \
353 $(MAKE) -f $(srctree)/Makefile $$i; \
354 done
355
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]356else # !mixed-build
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]357
Masahiro Yamada3204a7f2021-02-28 15:10:26 +0900[diff] [blame]358include $(srctree)/scripts/Kbuild.include
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]359
360# Read KERNELRELEASE from include/config/kernel.release (if it exists)
361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
362KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
364
Masahiro Yamada3204a7f2021-02-28 15:10:26 +0900[diff] [blame]365include $(srctree)/scripts/subarch.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]366
367# Cross compiling and selecting different set of gcc/bin-utils
368# ---------------------------------------------------------------------------
369#
370# When performing cross compilation for other architectures ARCH shall be set
371# to the target architecture. (See arch/* for the possibilities).
372# ARCH can be set during invocation of make:
373# make ARCH=ia64
374# Another way is to have ARCH set in the environment.
375# The default ARCH is the host where make is executed.
376
377# CROSS_COMPILE specify the prefix used for all executables used
378# during compilation. Only gcc and related bin-utils executables
379# are prefixed with $(CROSS_COMPILE).
380# CROSS_COMPILE can be set on the command line
381# make CROSS_COMPILE=ia64-linux-
382# Alternatively CROSS_COMPILE can be set in the environment.
383# Default value for CROSS_COMPILE is not to prefix executables
384# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a62009-10-11 23:22:58 +0200[diff] [blame]385ARCH ?= $(SUBARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]386
387# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200[diff] [blame]388UTS_MACHINE := $(ARCH)
389SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]390
Sam Ravnborgd746d642007-11-12 20:14:19 +0100[diff] [blame]391# Additional ARCH settings for x86
392ifeq ($(ARCH),i386)
393 SRCARCH := x86
394endif
395ifeq ($(ARCH),x86_64)
396 SRCARCH := x86
397endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200[diff] [blame]398
Sam Ravnborg5e538792008-12-02 23:17:12 -0800[diff] [blame]399# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000[diff] [blame]400ifeq ($(ARCH),sparc32)
401 SRCARCH := sparc
402endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200[diff] [blame]403ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800[diff] [blame]404 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200[diff] [blame]405endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200[diff] [blame]406
Masahiro Yamadaf02aa482021-04-10 23:31:58 +0900[diff] [blame]407export cross_compiling :=
408ifneq ($(SRCARCH),$(SUBARCH))
409cross_compiling := 1
410endif
411
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700[diff] [blame]412KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500[diff] [blame]413export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700[diff] [blame]414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]415# SHELL used by kbuild
Masahiro Yamada858805b2019-08-25 22:28:37 +0900[diff] [blame]416CONFIG_SHELL := sh
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]417
Masahiro Yamada6d79a7b2018-07-12 19:38:36 +0900[diff] [blame]418HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
419HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
420HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200[diff] [blame]421
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900[diff] [blame]422ifneq ($(LLVM),)
423HOSTCC = clang
424HOSTCXX = clang++
425else
426HOSTCC = gcc
427HOSTCXX = g++
428endif
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +0900[diff] [blame]429
430export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
431 -O2 -fomit-frame-pointer -std=gnu89
432export KBUILD_USERLDFLAGS :=
433
434KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
Masahiro Yamada735aab12020-03-25 12:14:32 +0900[diff] [blame]435KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
Laura Abbottf92d19e2018-07-09 17:46:02 -0700[diff] [blame]436KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
437KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]439# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]440CPP = $(CC) -E
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900[diff] [blame]441ifneq ($(LLVM),)
442CC = clang
443LD = ld.lld
444AR = llvm-ar
445NM = llvm-nm
446OBJCOPY = llvm-objcopy
447OBJDUMP = llvm-objdump
448READELF = llvm-readelf
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900[diff] [blame]449STRIP = llvm-strip
450else
451CC = $(CROSS_COMPILE)gcc
452LD = $(CROSS_COMPILE)ld
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]453AR = $(CROSS_COMPILE)ar
454NM = $(CROSS_COMPILE)nm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]455OBJCOPY = $(CROSS_COMPILE)objcopy
456OBJDUMP = $(CROSS_COMPILE)objdump
Dmitry Golovineefb8c12019-12-05 00:54:41 +0200[diff] [blame]457READELF = $(CROSS_COMPILE)readelf
Masahiro Yamadaa0d1c952020-04-08 10:36:23 +0900[diff] [blame]458STRIP = $(CROSS_COMPILE)strip
459endif
Andrii Nakryikoe83b9f52019-04-02 09:49:50 -0700[diff] [blame]460PAHOLE = pahole
Jiri Olsac9a0f3b2020-07-11 23:53:24 +0200[diff] [blame]461RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
Masahiro Yamada73a4f6d2017-12-10 01:02:28 +0900[diff] [blame]462LEX = flex
463YACC = bison
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]464AWK = awk
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200[diff] [blame]465INSTALLKERNEL := installkernel
Dominique Martinet436e9802020-12-01 14:17:30 +0100[diff] [blame]466DEPMOD = depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]467PERL = perl
Masahiro Yamadae9781b52018-03-13 18:12:02 +0900[diff] [blame]468PYTHON3 = python3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]469CHECK = sparse
Masahiro Yamada858805b2019-08-25 22:28:37 +0900[diff] [blame]470BASH = bash
Denis Efremove4a42c82020-06-08 12:59:44 +0300[diff] [blame]471KGZIP = gzip
472KBZIP2 = bzip2
473KLZOP = lzop
Denis Efremov8dfb61d2020-06-05 10:39:55 +0300[diff] [blame]474LZMA = lzma
475LZ4 = lz4c
476XZ = xz
Nick Terrell48f7ddf2020-07-30 12:08:36 -0700[diff] [blame]477ZSTD = zstd
Denis Efremov8dfb61d2020-06-05 10:39:55 +0300[diff] [blame]478
Hannes Eder80a7d1d2008-12-27 22:38:44 +0100[diff] [blame]479CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
Luc Van Oostenryck6c49f352018-02-15 22:07:50 +0100[diff] [blame]480 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
Douglas Anderson0c22be02019-03-14 16:41:59 -0700[diff] [blame]481NOSTDINC_FLAGS :=
Sam Ravnborg65881692010-07-28 17:33:09 +0200[diff] [blame]482CFLAGS_MODULE =
483AFLAGS_MODULE =
484LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]485CFLAGS_KERNEL =
486AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200[diff] [blame]487LDFLAGS_vmlinux =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]488
David Howellsabbf1592012-10-02 18:01:26 +0100[diff] [blame]489# Use USERINCLUDE when you must reference the UAPI directories only.
490USERINCLUDE := \
Masahiro Yamada9d022c52017-10-04 12:56:04 +0900[diff] [blame]491 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
492 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100[diff] [blame]493 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200[diff] [blame]494 -I$(objtree)/include/generated/uapi \
Masahiro Yamadace6ed1c2021-03-04 20:37:08 +0900[diff] [blame]495 -include $(srctree)/include/linux/compiler-version.h \
David Howellsabbf1592012-10-02 18:01:26 +0100[diff] [blame]496 -include $(srctree)/include/linux/kconfig.h
497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]498# Use LINUXINCLUDE when you must reference the include/ directory.
499# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100[diff] [blame]500LINUXINCLUDE := \
Masahiro Yamada9d022c52017-10-04 12:56:04 +0900[diff] [blame]501 -I$(srctree)/arch/$(SRCARCH)/include \
502 -I$(objtree)/arch/$(SRCARCH)/include/generated \
Masahiro Yamada051f2782019-07-06 12:07:12 +0900[diff] [blame]503 $(if $(building_out_of_srctree),-I$(srctree)/include) \
Masahiro Yamadaf8224f72017-06-06 16:15:28 +0900[diff] [blame]504 -I$(objtree)/include \
505 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]506
Masahiro Yamada42a92bc2018-12-14 17:05:37 +0900[diff] [blame]507KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
Masahiro Yamadaeeb56872018-12-14 17:05:38 +0900[diff] [blame]508KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
Masahiro Yamada42a92bc2018-12-14 17:05:37 +0900[diff] [blame]509 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
Luc Van Oostenryckb89f25e2019-03-04 13:55:20 +0100[diff] [blame]510 -Werror=implicit-function-declaration -Werror=implicit-int \
Olaf Hering172aad81a2020-10-11 20:54:31 +0200[diff] [blame]511 -Werror=return-type -Wno-format-security \
Masahiro Yamada433dc2e2017-10-12 18:22:25 +0900[diff] [blame]512 -std=gnu89
513KBUILD_CPPFLAGS := -D__KERNEL__
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200[diff] [blame]514KBUILD_AFLAGS_KERNEL :=
515KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg65881692010-07-28 17:33:09 +0200[diff] [blame]516KBUILD_AFLAGS_MODULE := -DMODULE
517KBUILD_CFLAGS_MODULE := -DMODULE
Masahiro Yamada10df0632019-08-15 01:06:22 +0900[diff] [blame]518KBUILD_LDFLAGS_MODULE :=
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900[diff] [blame]519KBUILD_LDFLAGS :=
Masahiro Yamada5241ab4c2019-07-29 18:15:17 +0900[diff] [blame]520CLANG_FLAGS :=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]521
Masahiro Yamadaaa824e02020-03-26 14:57:18 +0900[diff] [blame]522export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
Vasily Gorbikd9b56652020-10-23 13:57:32 +0200[diff] [blame]523export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
Masahiro Yamadad8d2d382021-02-01 10:00:24 +0900[diff] [blame]524export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
Nick Terrell48f7ddf2020-07-30 12:08:36 -0700[diff] [blame]525export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
Vasily Gorbik7bac9872019-01-21 13:54:39 +0100[diff] [blame]526export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]527
Masahiro Yamadad503ac52018-08-24 08:20:39 +0900[diff] [blame]528export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
Andrey Konovalov0e410e12018-02-06 15:36:00 -0800[diff] [blame]529export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Sam Ravnborg222d3942007-10-15 21:59:31 +0200[diff] [blame]530export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200[diff] [blame]531export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200[diff] [blame]532export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]534# Files to ignore in find ... statements
535
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500[diff] [blame]536export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
537 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
538 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100[diff] [blame]539export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
540 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]541
542# ===========================================================================
543# Rules shared between *config targets and build targets
544
Cao jin312a3d02017-08-02 10:31:06 +0800[diff] [blame]545# Basic helpers built in scripts/basic/
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]546PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]547scripts_basic:
548 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500[diff] [blame]549 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]550
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]551PHONY += outputmakefile
Masahiro Yamada2728fcf2021-05-17 16:03:11 +0900[diff] [blame]552ifdef building_out_of_srctree
Masahiro Yamadae8e83a22019-08-22 13:46:11 +0900[diff] [blame]553# Before starting out-of-tree build, make sure the source tree is clean.
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200[diff] [blame]554# outputmakefile generates a Makefile in the output directory, if using a
555# separate output directory. This allows convenient use of make in the
556# output directory.
Vladimir Kondratiev3a51ff32019-02-03 10:48:40 +0200[diff] [blame]557# At the same time when output Makefile generated, generate .gitignore to
558# ignore whole output directory
Masahiro Yamada2728fcf2021-05-17 16:03:11 +0900[diff] [blame]559
560quiet_cmd_makefile = GEN Makefile
561 cmd_makefile = { \
562 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
563 echo "include $(srctree)/Makefile"; \
564 } > Makefile
565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]566outputmakefile:
Masahiro Yamadae8e83a22019-08-22 13:46:11 +0900[diff] [blame]567 $(Q)if [ -f $(srctree)/.config -o \
568 -d $(srctree)/include/config -o \
569 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
570 echo >&2 "***"; \
571 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
572 echo >&2 "*** in $(abs_srctree)";\
573 echo >&2 "***"; \
574 false; \
575 fi
Andi Kleen92979992009-01-10 04:56:13 +0100[diff] [blame]576 $(Q)ln -fsn $(srctree) source
Masahiro Yamada2728fcf2021-05-17 16:03:11 +0900[diff] [blame]577 $(call cmd,makefile)
Masahiro Yamada156e7cb2019-03-26 13:26:58 +0900[diff] [blame]578 $(Q)test -e .gitignore || \
579 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200[diff] [blame]580endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]581
Nick Desaulniersdb075622021-02-05 14:01:25 -0800[diff] [blame]582# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
583# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
584# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
585# and from include/config/auto.conf.cmd to detect the compiler upgrade.
Masahiro Yamada6e0839f2021-03-14 15:15:50 +0900[diff] [blame]586CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
Nick Desaulniersdb075622021-02-05 14:01:25 -0800[diff] [blame]587
588ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
Chris Friesae6b2892017-11-07 11:46:13 -0800[diff] [blame]589ifneq ($(CROSS_COMPILE),)
Masahiro Yamada5241ab4c2019-07-29 18:15:17 +0900[diff] [blame]590CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
Chris Friesae6b2892017-11-07 11:46:13 -0800[diff] [blame]591endif
Masahiro Yamadaba64beb2021-03-16 01:12:56 +0900[diff] [blame]592ifeq ($(LLVM_IAS),1)
593CLANG_FLAGS += -integrated-as
594else
Masahiro Yamada238bcbc2018-11-06 12:04:55 +0900[diff] [blame]595CLANG_FLAGS += -no-integrated-as
Chris Friesae6b2892017-11-07 11:46:13 -0800[diff] [blame]596GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
597CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
Nathan Chancellor876a0602019-06-27 12:14:48 -0700[diff] [blame]598endif
Nathan Chancellor589834b2019-06-11 11:43:31 -0700[diff] [blame]599CLANG_FLAGS += -Werror=unknown-warning-option
Masahiro Yamada238bcbc2018-11-06 12:04:55 +0900[diff] [blame]600KBUILD_CFLAGS += $(CLANG_FLAGS)
601KBUILD_AFLAGS += $(CLANG_FLAGS)
Joel Stanley3bd98052018-11-12 14:51:15 +1030[diff] [blame]602export CLANG_FLAGS
Chris Friesae6b2892017-11-07 11:46:13 -0800[diff] [blame]603endif
604
Masahiro Yamada57fd2512021-02-28 15:10:27 +0900[diff] [blame]605# Include this also for config targets because some architectures need
606# cc-cross-prefix to determine CROSS_COMPILE.
Masahiro Yamada805b2e12021-02-28 15:10:28 +0900[diff] [blame]607ifdef need-compiler
Masahiro Yamada57fd2512021-02-28 15:10:27 +0900[diff] [blame]608include $(srctree)/scripts/Makefile.compiler
Masahiro Yamada805b2e12021-02-28 15:10:28 +0900[diff] [blame]609endif
Masahiro Yamada57fd2512021-02-28 15:10:27 +0900[diff] [blame]610
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]611ifdef config-build
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]612# ===========================================================================
613# *config targets only - make sure prerequisites are updated, and descend
614# in scripts/kconfig to make the *config target
615
616# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
617# KBUILD_DEFCONFIG may point out an alternative default configuration
618# used for 'make defconfig'
Masahiro Yamada3204a7f2021-02-28 15:10:26 +0900[diff] [blame]619include $(srctree)/arch/$(SRCARCH)/Makefile
Masahiro Yamada315bab42018-06-08 09:21:43 +0900[diff] [blame]620export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]621
Masahiro Yamada36de0772019-08-22 13:46:13 +0900[diff] [blame]622config: outputmakefile scripts_basic FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100[diff] [blame]623 $(Q)$(MAKE) $(build)=scripts/kconfig $@
624
Masahiro Yamada36de0772019-08-22 13:46:13 +0900[diff] [blame]625%config: outputmakefile scripts_basic FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]626 $(Q)$(MAKE) $(build)=scripts/kconfig $@
627
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]628else #!config-build
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]629# ===========================================================================
630# Build targets only - this includes vmlinux, arch specific targets, clean
631# targets and others. In general all targets except *config targets.
632
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]633# If building an external module we do not care about the all: rule
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]634# but instead __all depend on modules
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]635PHONY += all
636ifeq ($(KBUILD_EXTMOD),)
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]637__all: all
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]638else
Masahiro Yamada121c2a12020-05-11 12:50:13 +0900[diff] [blame]639__all: modules
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]640endif
641
642# Decide whether to build built-in, modular, or both.
643# Normally, just do built-in.
644
645KBUILD_MODULES :=
646KBUILD_BUILTIN := 1
647
648# If we have only "make modules", don't compile built-in objects.
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]649ifeq ($(MAKECMDGOALS),modules)
Masahiro Yamada4b50c8c2020-05-31 17:47:06 +0900[diff] [blame]650 KBUILD_BUILTIN :=
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]651endif
652
653# If we have "make <whatever> modules", compile modules
654# in addition to whatever we do anyway.
655# Just "make" or "make all" shall build modules as well
656
Nathan Huckleberry6ad7cbc2020-08-22 23:56:18 +0900[diff] [blame]657ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]658 KBUILD_MODULES := 1
659endif
660
661ifeq ($(MAKECMDGOALS),)
662 KBUILD_MODULES := 1
663endif
664
665export KBUILD_MODULES KBUILD_BUILTIN
666
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]667ifdef need-config
Masahiro Yamadad93a18f2019-04-27 12:33:36 +0900[diff] [blame]668include include/config/auto.conf
669endif
670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]671ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]672# Objects we will link into vmlinux / subdirs we need to visit
Masahiro Yamadad92cc4d2021-05-12 16:57:25 +0900[diff] [blame]673core-y := init/ usr/ arch/$(SRCARCH)/
Masahiro Yamadaf96182e2019-01-11 18:52:00 +0900[diff] [blame]674drivers-y := drivers/ sound/
Masahiro Yamadad93a18f2019-04-27 12:33:36 +0900[diff] [blame]675drivers-$(CONFIG_SAMPLES) += samples/
Masahiro Yamada8b5f4eb2021-01-26 08:16:55 +0900[diff] [blame]676drivers-$(CONFIG_NET) += net/
677drivers-y += virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]678libs-y := lib/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]679endif # KBUILD_EXTMOD
680
Masahiro Yamada315bab42018-06-08 09:21:43 +0900[diff] [blame]681# The all: target is the default when no target is given on the
682# command line.
683# This allow a user to issue only 'make' to build a kernel including modules
684# Defaults to vmlinux, but the arch makefile usually adds further targets
685all: vmlinux
686
687CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
688 $(call cc-option,-fno-tree-loop-im) \
689 $(call cc-disable-warning,maybe-uninitialized,)
Masahiro Yamada5aadfde2018-05-28 18:22:04 +0900[diff] [blame]690export CFLAGS_GCOV
Masahiro Yamada315bab42018-06-08 09:21:43 +0900[diff] [blame]691
Paulo Zanonib1f4ff72018-09-10 10:59:56 -0700[diff] [blame]692# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
693ifdef CONFIG_FUNCTION_TRACER
694 CC_FLAGS_FTRACE := -pg
695endif
696
Masahiro Yamada669e06b2019-03-26 15:11:12 +0900[diff] [blame]697RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
698RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
699RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
700RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
701RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
702RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
703export RETPOLINE_CFLAGS
704export RETPOLINE_VDSO_CFLAGS
705
Masahiro Yamada3204a7f2021-02-28 15:10:26 +0900[diff] [blame]706include $(srctree)/arch/$(SRCARCH)/Makefile
Masahiro Yamada315bab42018-06-08 09:21:43 +0900[diff] [blame]707
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]708ifdef need-config
709ifdef may-sync-config
Masahiro Yamada315bab42018-06-08 09:21:43 +0900[diff] [blame]710# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
711# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
712# because some architectures define CROSS_COMPILE there.
Masahiro Yamadad2f8ae02019-05-12 11:13:48 +0900[diff] [blame]713include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]714
Masahiro Yamada05850712019-02-22 16:40:11 +0900[diff] [blame]715$(KCONFIG_CONFIG):
716 @echo >&2 '***'
717 @echo >&2 '*** Configuration file "$@" not found!'
718 @echo >&2 '***'
719 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
720 @echo >&2 '*** "make menuconfig" or "make xconfig").'
721 @echo >&2 '***'
722 @/bin/false
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]723
Ulf Magnusson61277982018-02-13 08:58:20 +0100[diff] [blame]724# The actual configuration files used during the build are stored in
725# include/generated/ and include/config/. Update them if .config is newer than
726# include/config/auto.conf (which mirrors .config).
Masahiro Yamada9390dff2019-02-22 16:40:10 +0900[diff] [blame]727#
728# This exploits the 'multi-target pattern rule' trick.
729# The syncconfig should be executed only once to make all the targets.
Masahiro Yamadaf463c352020-03-25 12:16:30 +0900[diff] [blame]730# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
Masahiro Yamada23cd88c2020-08-21 11:43:58 +0900[diff] [blame]731quiet_cmd_syncconfig = SYNC $@
732 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
733
Masahiro Yamada3044dd02020-05-01 15:01:41 +0900[diff] [blame]734%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
Masahiro Yamada23cd88c2020-08-21 11:43:58 +0900[diff] [blame]735 +$(call cmd,syncconfig)
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]736else # !may-sync-config
Masahiro Yamadad7942412018-07-20 16:46:34 +0900[diff] [blame]737# External modules and some install targets need include/generated/autoconf.h
738# and include/config/auto.conf but do not care if they are up-to-date.
739# Use auto.conf to trigger the test
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200[diff] [blame]740PHONY += include/config/auto.conf
741
742include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200[diff] [blame]743 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200[diff] [blame]744 echo >&2; \
745 echo >&2 " ERROR: Kernel configuration is invalid."; \
746 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
747 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
748 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200[diff] [blame]749 /bin/false)
750
Masahiro Yamadad7942412018-07-20 16:46:34 +0900[diff] [blame]751endif # may-sync-config
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]752endif # need-config
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]753
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200[diff] [blame]754KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700[diff] [blame]755KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvaldsbd664f62017-07-12 19:25:47 -0700[diff] [blame]756KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
757KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
Linus Torvalds6f303d62019-05-01 11:05:41 -0700[diff] [blame]758KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200[diff] [blame]759
Masahiro Yamada15f5db62019-08-21 02:09:40 +0900[diff] [blame]760ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
761KBUILD_CFLAGS += -O2
762else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
763KBUILD_CFLAGS += -O3
764else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
765KBUILD_CFLAGS += -Os
Arnd Bergmann815eb712016-04-25 17:35:28 +0200[diff] [blame]766endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]767
Jiri Kosina69102312014-08-06 16:08:43 -0700[diff] [blame]768# Tell gcc to never replace conditional load with a non-conditional one
769KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
Sergei Trofimovichb11121392020-03-17 00:07:18 +0000[diff] [blame]770KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
Jiri Kosina69102312014-08-06 16:08:43 -0700[diff] [blame]771
Andi Kleen1873e872012-03-28 11:51:18 -0700[diff] [blame]772ifdef CONFIG_READABLE_ASM
773# Disable optimizations that make assembler listings hard to read.
774# reorder blocks reorders the control in the function
775# ipa clone creates specialized cloned functions
776# partial inlining inlines only parts of functions
777KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
778 $(call cc-option,-fno-ipa-cp-clone,) \
779 $(call cc-option,-fno-partial-inlining)
780endif
781
Mike Frysinger08f67462009-06-04 16:29:08 -0700[diff] [blame]782ifneq ($(CONFIG_FRAME_WARN),0)
Masahiro Yamadaa83e4ca2020-02-17 00:19:36 +0900[diff] [blame]783KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100[diff] [blame]784endif
785
Masahiro Yamada893ab0042020-06-27 03:59:12 +0900[diff] [blame]786stackp-flags-y := -fno-stack-protector
Linus Torvalds050e9ba2018-06-14 12:21:18 +0900[diff] [blame]787stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
788stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
Masahiro Yamada2a61f472018-05-28 18:22:00 +0900[diff] [blame]789
790KBUILD_CFLAGS += $(stackp-flags-y)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100[diff] [blame]791
Masahiro Yamada076f4212018-10-30 22:26:33 +0900[diff] [blame]792ifdef CONFIG_CC_IS_CLANG
Masahiro Yamadaa1494302019-05-10 23:10:09 +0900[diff] [blame]793KBUILD_CPPFLAGS += -Qunused-arguments
794KBUILD_CFLAGS += -Wno-format-invalid-specifier
795KBUILD_CFLAGS += -Wno-gnu
Masahiro Yamadacfe17c92017-11-27 21:15:13 +0900[diff] [blame]796# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
797# source of a reference will be _MergedGlobals and not on of the whitelisted names.
798# See modpost pattern 2
Masahiro Yamadaa1494302019-05-10 23:10:09 +0900[diff] [blame]799KBUILD_CFLAGS += -mno-global-merge
Masahiro Yamadacfe17c92017-11-27 21:15:13 +0900[diff] [blame]800else
801
Nathan Chancellore2079e92019-08-26 17:41:55 -0700[diff] [blame]802# Warn about unmarked fall-throughs in switch statement.
803# Disabled for clang while comment to attribute conversion happens and
804# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
805KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
Masahiro Yamadacfe17c92017-11-27 21:15:13 +0900[diff] [blame]806endif
807
Nathan Chancellor885480b2021-04-28 18:23:50 -0700[diff] [blame]808# These warnings generated too much noise in a regular build.
809# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
810KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
811
Sodagudi Prasad0a5f4172018-02-06 15:46:51 -0800[diff] [blame]812KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]813ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200[diff] [blame]814KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]815else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100[diff] [blame]816# Some targets (ARM with Thumb2, for example), can't be built with frame
817# pointers. For those, we don't have FUNCTION_TRACER automatically
818# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
819# incompatible with -fomit-frame-pointer with current GCC, so we don't use
820# -fomit-frame-pointer with FUNCTION_TRACER.
821ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200[diff] [blame]822KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]823endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100[diff] [blame]824endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]825
glider@google.comf0fe00d2020-06-16 10:34:35 +0200[diff] [blame]826# Initialize all stack variables with a 0xAA pattern.
827ifdef CONFIG_INIT_STACK_ALL_PATTERN
Kees Cook709a9722019-04-10 08:48:31 -0700[diff] [blame]828KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
829endif
830
glider@google.comf0fe00d2020-06-16 10:34:35 +0200[diff] [blame]831# Initialize all stack variables with a zero value.
832ifdef CONFIG_INIT_STACK_ALL_ZERO
833# Future support for zero initialization is still being debated, see
834# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
835# renamed or dropped.
836KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
837KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
838endif
839
Kees Cook39218ff2021-04-01 16:23:44 -0700[diff] [blame]840# While VLAs have been removed, GCC produces unreachable stack probes
841# for the randomize_kstack_offset feature. Disable it for all compilers.
842KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
843
Masahiro Yamada315da872021-02-03 16:52:39 +0900[diff] [blame]844DEBUG_CFLAGS :=
845
Mark Wielaard121c5d02020-10-17 14:01:35 +0200[diff] [blame]846# Workaround for GCC versions < 5.0
847# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
848ifdef CONFIG_CC_IS_GCC
Masahiro Yamada315da872021-02-03 16:52:39 +0900[diff] [blame]849DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
Mark Wielaard121c5d02020-10-17 14:01:35 +0200[diff] [blame]850endif
Linus Torvalds2062afb2014-07-26 14:52:01 -0700[diff] [blame]851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]852ifdef CONFIG_DEBUG_INFO
Sedat Dilek695afd32020-08-16 14:32:44 +0200[diff] [blame]853
Andi Kleen866ced92014-07-30 20:50:18 +0200[diff] [blame]854ifdef CONFIG_DEBUG_INFO_SPLIT
Masahiro Yamada9d937442019-02-22 16:56:09 +0900[diff] [blame]855DEBUG_CFLAGS += -gsplit-dwarf
Andi Kleen866ced92014-07-30 20:50:18 +0200[diff] [blame]856else
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900[diff] [blame]857DEBUG_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200[diff] [blame]858endif
Sedat Dilek695afd32020-08-16 14:32:44 +0200[diff] [blame]859
Nick Desaulniersb8a90922020-11-09 10:35:28 -0800[diff] [blame]860ifneq ($(LLVM_IAS),1)
Behan Webster22883282014-02-14 15:19:17 -0800[diff] [blame]861KBUILD_AFLAGS += -Wa,-gdwarf-2
Nick Desaulniersb8a90922020-11-09 10:35:28 -0800[diff] [blame]862endif
Sedat Dilek695afd32020-08-16 14:32:44 +0200[diff] [blame]863
Nick Desaulniersa66049e2021-02-05 12:22:19 -0800[diff] [blame]864ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
865dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
Nick Desaulniers98cd6f52021-02-05 12:22:20 -0800[diff] [blame]866dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
Nick Desaulniersa66049e2021-02-05 12:22:19 -0800[diff] [blame]867DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200[diff] [blame]868endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]869
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200[diff] [blame]870ifdef CONFIG_DEBUG_INFO_REDUCED
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900[diff] [blame]871DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
Andi Kleene82c4bb2013-02-07 13:58:40 -0800[diff] [blame]872 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200[diff] [blame]873endif
874
Nick Desaulniers10e68b022020-05-26 10:18:29 -0700[diff] [blame]875ifdef CONFIG_DEBUG_INFO_COMPRESSED
876DEBUG_CFLAGS += -gz=zlib
Arvind Sankar7b169942020-06-11 18:03:39 -0400[diff] [blame]877KBUILD_AFLAGS += -gz=zlib
Nick Desaulniers10e68b022020-05-26 10:18:29 -0700[diff] [blame]878KBUILD_LDFLAGS += --compress-debug-sections=zlib
879endif
880
Sedat Dilek695afd32020-08-16 14:32:44 +0200[diff] [blame]881endif # CONFIG_DEBUG_INFO
882
Masahiro Yamada1e88e412019-02-10 15:51:00 +0900[diff] [blame]883KBUILD_CFLAGS += $(DEBUG_CFLAGS)
884export DEBUG_CFLAGS
885
Steven Rostedt606576c2008-10-06 19:06:12 -0400[diff] [blame]886ifdef CONFIG_FUNCTION_TRACER
Sami Tolvanen3b15cdc12020-12-11 10:46:18 -0800[diff] [blame]887ifdef CONFIG_FTRACE_MCOUNT_USE_CC
888 CC_FLAGS_FTRACE += -mrecord-mcount
Vasily Gorbik2f4df002018-08-06 15:17:46 +0200[diff] [blame]889 ifdef CONFIG_HAVE_NOP_MCOUNT
890 ifeq ($(call cc-option-yn, -mnop-mcount),y)
891 CC_FLAGS_FTRACE += -mnop-mcount
892 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
893 endif
894 endif
Steven Rostedta2546fa2011-02-09 13:15:59 -0500[diff] [blame]895endif
Sami Tolvanen22c85422020-09-25 16:43:53 -0700[diff] [blame]896ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
897 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
898endif
Sami Tolvanen3b15cdc12020-12-11 10:46:18 -0800[diff] [blame]899ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
900 ifdef CONFIG_HAVE_C_RECORDMCOUNT
901 BUILD_C_RECORDMCOUNT := y
902 export BUILD_C_RECORDMCOUNT
903 endif
904endif
Steven Rostedta2546fa2011-02-09 13:15:59 -0500[diff] [blame]905ifdef CONFIG_HAVE_FENTRY
Vasily Gorbikf28bc3c2018-08-06 15:17:42 +0200[diff] [blame]906 ifeq ($(call cc-option-yn, -mfentry),y)
907 CC_FLAGS_FTRACE += -mfentry
908 CC_FLAGS_USING += -DCC_USING_FENTRY
909 endif
Steven Rostedta2546fa2011-02-09 13:15:59 -0500[diff] [blame]910endif
Vasily Gorbikf28bc3c2018-08-06 15:17:42 +0200[diff] [blame]911export CC_FLAGS_FTRACE
912KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
913KBUILD_AFLAGS += $(CC_FLAGS_USING)
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200[diff] [blame]914endif
915
Sam Ravnborg91341d42008-01-21 21:31:44 +0100[diff] [blame]916# We trigger additional mismatches with less inlining
917ifdef CONFIG_DEBUG_SECTION_MISMATCH
918KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
919endif
920
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900[diff] [blame]921ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
Masahiro Yamadae85d1d62018-08-22 22:51:09 +0900[diff] [blame]922KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
923LDFLAGS_vmlinux += --gc-sections
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900[diff] [blame]924endif
925
Sami Tolvanend08b9f02020-04-27 09:00:07 -0700[diff] [blame]926ifdef CONFIG_SHADOW_CALL_STACK
927CC_FLAGS_SCS := -fsanitize=shadow-call-stack
928KBUILD_CFLAGS += $(CC_FLAGS_SCS)
929export CC_FLAGS_SCS
930endif
931
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]932ifdef CONFIG_LTO_CLANG
933ifdef CONFIG_LTO_CLANG_THIN
Alexander Lobakin2b868952021-01-21 18:45:55 +0000[diff] [blame]934CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]935KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]936else
Alexander Lobakin2b868952021-01-21 18:45:55 +0000[diff] [blame]937CC_FLAGS_LTO := -flto
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]938endif
939CC_FLAGS_LTO += -fvisibility=hidden
Sami Tolvanen22d429e2020-12-11 10:46:21 -0800[diff] [blame]940
941# Limit inlining across translation units to reduce binary size
942KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
Nick Desaulniers24845dc2021-03-11 17:09:41 -0800[diff] [blame]943
Tor Vic02365262021-06-13 13:07:49 +0000[diff] [blame]944# Check for frame size exceeding threshold during prolog/epilog insertion
945# when using lld < 13.0.0.
Nick Desaulniers24845dc2021-03-11 17:09:41 -0800[diff] [blame]946ifneq ($(CONFIG_FRAME_WARN),0)
Tor Vic02365262021-06-13 13:07:49 +0000[diff] [blame]947ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
Nick Desaulniers24845dc2021-03-11 17:09:41 -0800[diff] [blame]948KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
949endif
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]950endif
Tor Vic02365262021-06-13 13:07:49 +0000[diff] [blame]951endif
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]952
953ifdef CONFIG_LTO
Sami Tolvanen5e953252021-02-23 13:59:52 -0800[diff] [blame]954KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
955KBUILD_AFLAGS += -fno-lto
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]956export CC_FLAGS_LTO
957endif
958
Sami Tolvanencf68fff2021-04-08 11:28:26 -0700[diff] [blame]959ifdef CONFIG_CFI_CLANG
960CC_FLAGS_CFI := -fsanitize=cfi \
961 -fsanitize-cfi-cross-dso \
962 -fno-sanitize-cfi-canonical-jump-tables \
963 -fno-sanitize-trap=cfi \
964 -fno-sanitize-blacklist
965
966ifdef CONFIG_CFI_PERMISSIVE
967CC_FLAGS_CFI += -fsanitize-recover=cfi
968endif
969
970# If LTO flags are filtered out, we must also filter out CFI.
971CC_FLAGS_LTO += $(CC_FLAGS_CFI)
972KBUILD_CFLAGS += $(CC_FLAGS_CFI)
973export CC_FLAGS_CFI
974endif
975
Feng Tangcf536e12021-05-06 15:34:59 +0800[diff] [blame]976ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
977KBUILD_CFLAGS += -falign-functions=64
Feng Tang09c60542020-08-11 18:34:13 -0700[diff] [blame]978endif
979
Sam Ravnborge8e69932005-04-30 16:51:42 -0700[diff] [blame]980# arch Makefile may override CC so keep this after arch Makefile is included
Masahiro Yamadae08d6de2018-05-28 18:21:38 +0900[diff] [blame]981NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700[diff] [blame]982
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]983# warn about C99 declaration after statement
Masahiro Yamadaa33e7ae2018-10-01 18:44:37 +0900[diff] [blame]984KBUILD_CFLAGS += -Wdeclaration-after-statement
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]985
Kees Cook0bb95f82018-06-25 15:59:34 -0700[diff] [blame]986# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
Masahiro Yamada8289f912019-05-09 15:45:49 +0900[diff] [blame]987KBUILD_CFLAGS += -Wvla
Kees Cook0bb95f82018-06-25 15:59:34 -0700[diff] [blame]988
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200[diff] [blame]989# disable pointer signed / unsigned warnings in gcc 4.0
Masahiro Yamadafb073a4b2018-10-01 18:44:36 +0900[diff] [blame]990KBUILD_CFLAGS += -Wno-pointer-sign
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]991
Stephen Rothwell217c3e02018-08-31 07:47:28 +1000[diff] [blame]992# disable stringop warnings in gcc 8+
993KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
994
Linus Torvalds5c45de22020-05-09 14:30:29 -0700[diff] [blame]995# We'll want to enable this eventually, but it's not going away for 5.7 at least
996KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
Linus Torvalds44720992020-05-09 14:52:44 -0700[diff] [blame]997KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
Linus Torvalds5a760212020-05-09 15:40:52 -0700[diff] [blame]998KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
Linus Torvalds5c45de22020-05-09 14:30:29 -0700[diff] [blame]999
Linus Torvaldsadc71922020-05-09 15:45:21 -0700[diff] [blame]1000# Another good warning that we'll want to enable eventually
1001KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1002
Linus Torvalds78a52552020-05-09 13:57:10 -0700[diff] [blame]1003# Enabled with W=2, disabled by default as noisy
1004KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
1005
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400[diff] [blame]1006# disable invalid "can't wrap" optimizations for signed / pointers
Masahiro Yamada8b42cf22020-09-10 22:51:17 +0900[diff] [blame]1007KBUILD_CFLAGS += -fno-strict-overflow
Linus Torvaldsd0115552009-03-19 15:53:19 -0700[diff] [blame]1008
Linus Torvalds3ce120b2017-12-29 17:34:43 -0800[diff] [blame]1009# Make sure -fstack-check isn't enabled (like gentoo apparently did)
Masahiro Yamada7d4eb0d2020-09-10 22:51:19 +0900[diff] [blame]1010KBUILD_CFLAGS += -fno-stack-check
Linus Torvalds3ce120b2017-12-29 17:34:43 -0800[diff] [blame]1011
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700[diff] [blame]1012# conserve stack if available
1013KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
1014
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800[diff] [blame]1015# Prohibit date/time macros, which would make the build non-deterministic
Masahiro Yamada87de84c2020-09-10 22:51:20 +0900[diff] [blame]1016KBUILD_CFLAGS += -Werror=date-time
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800[diff] [blame]1017
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100[diff] [blame]1018# enforce correct pointer usage
1019KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1020
Kees Cookc834f0e2017-03-20 17:14:11 -0700[diff] [blame]1021# Require designated initializers for all marked structures
1022KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1023
Masahiro Yamadaa73619a2018-03-30 13:15:26 +0900[diff] [blame]1024# change __FILE__ to the relative path from the srctree
Denys Zagoruia716bd72020-11-02 04:08:53 -0800[diff] [blame]1025KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
Masahiro Yamadaa73619a2018-03-30 13:15:26 +0900[diff] [blame]1026
Masahiro Yamadae0fe0bb2020-08-02 00:00:49 +0900[diff] [blame]1027# include additional Makefiles when needed
1028include-y := scripts/Makefile.extrawarn
1029include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1030include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1031include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1032include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1033include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1034
1035include $(addprefix $(srctree)/, $(include-y))
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900[diff] [blame]1036
Masahiro Yamada132305b2020-08-02 00:00:50 +0900[diff] [blame]1037# scripts/Makefile.gcc-plugins is intentionally included last.
1038# Do not add $(call cc-option,...) below this line. When you build the kernel
1039# from the clean source tree, the GCC plugins do not exist at this point.
Jason Baronbf5438fc2010-09-17 11:09:00 -0400[diff] [blame]1040
Masahiro Yamada8cc7af72019-08-21 02:09:41 +0900[diff] [blame]1041# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1042KBUILD_CPPFLAGS += $(KCPPFLAGS)
1043KBUILD_AFLAGS += $(KAFLAGS)
1044KBUILD_CFLAGS += $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200[diff] [blame]1045
Bill Wendlinga9684332020-09-22 16:21:40 -0700[diff] [blame]1046KBUILD_LDFLAGS_MODULE += --build-id=sha1
1047LDFLAGS_vmlinux += --build-id=sha1
Roland McGrath18991192007-07-19 01:48:40 -0700[diff] [blame]1048
David Howells5d7d18f2009-03-04 11:59:07 -0800[diff] [blame]1049ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200[diff] [blame]1050LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800[diff] [blame]1051endif
1052
Peter Collingbourne5cf896fb62019-07-31 18:18:42 -0700[diff] [blame]1053ifeq ($(CONFIG_RELR),y)
Nick Desaulniers27f2a4d2021-05-21 18:26:24 -0700[diff] [blame]1054LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
Peter Collingbourne5cf896fb62019-07-31 18:18:42 -0700[diff] [blame]1055endif
1056
Nathan Chancellor59612b22020-11-19 13:46:56 -0700[diff] [blame]1057# We never want expected sections to be placed heuristically by the
1058# linker. All sections should be explicitly named in the linker script.
1059ifdef CONFIG_LD_ORPHAN_WARN
1060LDFLAGS_vmlinux += --orphan-handling=warn
1061endif
1062
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +0900[diff] [blame]1063# Align the bit size of userspace programs with the kernel
Masahiro Yamada7f58b482020-07-01 00:06:25 +0900[diff] [blame]1064KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1065KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
Masahiro Yamada7f3a59d2020-04-29 12:45:14 +0900[diff] [blame]1066
Luc Van Oostenryck80591e62019-11-09 13:12:16 +0100[diff] [blame]1067# make the checker run with the right architecture
1068CHECKFLAGS += --arch=$(ARCH)
1069
Luc Van Oostenryck145167652018-05-28 20:27:35 +0200[diff] [blame]1070# insure the checker run with the right endianness
1071CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1072
Luc Van Oostenryck1f2f01b2018-05-30 22:48:38 +0200[diff] [blame]1073# the checker needs the correct machine size
1074CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1075
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1076# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200[diff] [blame]1077# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1078# set in the environment
1079# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1080# this default value
1081export KBUILD_IMAGE ?= vmlinux
1082
1083#
1084# INSTALL_PATH specifies where to place the updated kernel and system map
1085# images. Default is /boot, but you can set it to other values
1086export INSTALL_PATH ?= /boot
1087
1088#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000[diff] [blame]1089# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1090# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1091# an argument if needed. Otherwise it defaults to the kernel install path
1092#
1093export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1094
1095#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1096# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1097# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200[diff] [blame]1098# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1099#
1100
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100[diff] [blame]1101MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1102export MODLIB
1103
Masahiro Yamadae00d8882019-01-15 16:19:00 +0900[diff] [blame]1104PHONY += prepare0
Rusty Russelle2a666d2012-10-19 11:53:15 +1030[diff] [blame]1105
Masahiro Yamadaccae4cf2021-03-31 22:38:07 +0900[diff] [blame]1106export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1107export MODORDER := $(extmod_prefix)modules.order
1108export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
Masahiro Yamada47801c92019-08-02 19:23:58 +0900[diff] [blame]1109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1110ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100[diff] [blame]1111core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1112
Masahiro Yamada23febe32020-06-01 14:56:57 +0900[diff] [blame]1113vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1114 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Masahiro Yamada95fb6312020-06-01 14:56:58 +0900[diff] [blame]1115 $(libs-y) $(libs-m)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1116
Masahiro Yamada1eaca4b2019-04-27 12:33:37 +0900[diff] [blame]1117vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
Masahiro Yamada23febe32020-06-01 14:56:57 +0900[diff] [blame]1118 $(patsubst %/,%,$(filter %/, $(core-) \
Masahiro Yamada95fb6312020-06-01 14:56:58 +0900[diff] [blame]1119 $(drivers-) $(libs-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1120
Masahiro Yamadab2c88552020-06-01 14:57:00 +0900[diff] [blame]1121subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1122 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1123 $(drivers-y) $(drivers-m)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1124
Masahiro Yamadac99f3912019-08-11 00:53:04 +0900[diff] [blame]1125build-dirs := $(vmlinux-dirs)
Masahiro Yamada76cd3062019-08-11 00:53:05 +0900[diff] [blame]1126clean-dirs := $(vmlinux-alldirs)
Masahiro Yamadac99f3912019-08-11 00:53:04 +0900[diff] [blame]1127
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200[diff] [blame]1128# Externally visible symbols (used by link-vmlinux.sh)
Masahiro Yamadaf0d50ca2020-06-01 14:56:59 +0900[diff] [blame]1129KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1130KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1131ifdef CONFIG_MODULES
1132KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1133KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1134else
1135KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1136endif
1137KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1138
1139export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
Sam Ravnborg95698572012-05-05 10:18:40 +0200[diff] [blame]1140export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Masahiro Yamada85f0ae72019-09-21 22:18:46 +0900[diff] [blame]1141# used by scripts/Makefile.package
Masahiro Yamada233c7412019-05-16 01:18:54 +0900[diff] [blame]1142export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1143
Masahiro Yamadad151e972019-01-17 09:10:04 +0900[diff] [blame]1144vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1145
Masahiro Yamada3fdc7d32018-03-16 16:37:15 +0900[diff] [blame]1146# Recurse until adjust_autoksyms.sh is satisfied
1147PHONY += autoksyms_recursive
Nicolas Pitre2441e782016-04-22 15:25:00 -0400[diff] [blame]1148ifdef CONFIG_TRIM_UNUSED_KSYMS
Masahiro Yamada1f50b802018-03-16 16:37:13 +0900[diff] [blame]1149# For the kernel to actually contain only the needed exported symbols,
1150# we have to build modules as well to determine what those symbols are.
1151# (this can be evaluated only once include/config/auto.conf has been included)
Masahiro Yamadafb2d99b2020-05-31 19:11:39 +0900[diff] [blame]1152KBUILD_MODULES := 1
1153
1154autoksyms_recursive: descend modules.order
1155 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1156 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Masahiro Yamada1f50b802018-03-16 16:37:13 +0900[diff] [blame]1157endif
1158
Masahiro Yamada07a422b2018-03-16 16:37:12 +0900[diff] [blame]1159autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1160
Quentin Perret88694cf2020-02-28 17:20:15 +0000[diff] [blame]1161quiet_cmd_autoksyms_h = GEN $@
1162 cmd_autoksyms_h = mkdir -p $(dir $@); \
1163 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1164
Masahiro Yamada07a422b2018-03-16 16:37:12 +0900[diff] [blame]1165$(autoksyms_h):
Quentin Perret88694cf2020-02-28 17:20:15 +0000[diff] [blame]1166 $(call cmd,autoksyms_h)
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500[diff] [blame]1167
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000[diff] [blame]1168ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1169
1170# Final link of vmlinux with optional arch pass after final link
Cao jin312a3d02017-08-02 10:31:06 +0800[diff] [blame]1171cmd_link-vmlinux = \
Masahiro Yamada3ec8a5b2020-07-02 04:29:36 +0900[diff] [blame]1172 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000[diff] [blame]1173 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -0400[diff] [blame]1174
Masahiro Yamada3fdc7d32018-03-16 16:37:15 +0900[diff] [blame]1175vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
Rasmus Villemoes0b956e22021-03-05 11:02:12 +0100[diff] [blame]1176 +$(call if_changed_dep,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200[diff] [blame]1177
Masahiro Yamada392885e2018-11-30 10:05:22 +0900[diff] [blame]1178targets := vmlinux
1179
Masahiro Yamada38385f82014-04-28 16:26:18 +0900[diff] [blame]1180# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1181# make sure no implicit rule kicks in
Masahiro Yamadab2c88552020-06-01 14:57:00 +0900[diff] [blame]1182$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1183
Masahiro Yamadaba97df42019-01-03 10:16:54 +0900[diff] [blame]1184filechk_kernel.release = \
Michal Marek0d0e7712013-07-11 15:34:51 +0200[diff] [blame]1185 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Michal Marek0d0e7712013-07-11 15:34:51 +0200[diff] [blame]1186
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +0200[diff] [blame]1187# Store (new) KERNELRELEASE string in include/config/kernel.release
Masahiro Yamada24512792019-04-07 19:03:18 +0900[diff] [blame]1188include/config/kernel.release: FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +0200[diff] [blame]1189 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100[diff] [blame]1190
Masahiro Yamadad8821622018-03-16 16:37:11 +0900[diff] [blame]1191# Additional helpers built in scripts/
1192# Carefully list dependencies so we do not try to build scripts twice
1193# in parallel
1194PHONY += scripts
Masahiro Yamada60df1ae2018-11-29 12:13:24 +0900[diff] [blame]1195scripts: scripts_basic scripts_dtc
Masahiro Yamadad8821622018-03-16 16:37:11 +0900[diff] [blame]1196 $(Q)$(MAKE) $(build)=$(@)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100[diff] [blame]1197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1198# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200[diff] [blame]1199# or the modules are listed in "prepare".
1200# A multi level approach is used. prepareN is processed before prepareN-1.
1201# archprepare is used in arch Makefiles and when processed asm symlink,
1202# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1203
Masahiro Yamadaa5139fb2019-08-22 13:46:12 +0900[diff] [blame]1204PHONY += prepare archprepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200[diff] [blame]1205
Masahiro Yamada36de0772019-08-22 13:46:13 +0900[diff] [blame]1206archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
Masahiro Yamada3044dd02020-05-01 15:01:41 +0900[diff] [blame]1207 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
Masahiro Yamada1476fee52021-04-25 16:07:12 +0900[diff] [blame]1208 include/generated/autoconf.h remove-stale-files
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200[diff] [blame]1209
Masahiro Yamada65bba042018-11-29 11:58:50 +0900[diff] [blame]1210prepare0: archprepare
Masahiro Yamada60df1ae2018-11-29 12:13:24 +0900[diff] [blame]1211 $(Q)$(MAKE) $(build)=scripts/mod
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200[diff] [blame]1212 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200[diff] [blame]1213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1214# All the preparing..
Masahiro Yamada0d989ac2021-05-12 15:52:01 +0900[diff] [blame]1215prepare: prepare0
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600[diff] [blame]1216
Masahiro Yamada1476fee52021-04-25 16:07:12 +0900[diff] [blame]1217PHONY += remove-stale-files
1218remove-stale-files:
1219 $(Q)$(srctree)/scripts/remove-stale-files
1220
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]1221# Support for using generic headers in asm-generic
Masahiro Yamada7d0e5c22018-12-05 20:28:04 +0900[diff] [blame]1222asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1223
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]1224PHONY += asm-generic uapi-asm-generic
1225asm-generic: uapi-asm-generic
Masahiro Yamada037fc332019-03-17 11:01:09 +0900[diff] [blame]1226 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1227 generic=include/asm-generic
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]1228uapi-asm-generic:
Masahiro Yamada037fc332019-03-17 11:01:09 +0900[diff] [blame]1229 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1230 generic=include/uapi/asm-generic
Masahiro Yamada2c1f4f12017-10-04 12:56:06 +0900[diff] [blame]1231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1232# Generate some files
1233# ---------------------------------------------------------------------------
1234
1235# KERNELRELEASE can change from a few different places, meaning version.h
1236# needs to be updated, so this check is forced on all builds
1237
1238uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200[diff] [blame]1239define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1240 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200[diff] [blame]1241 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1242 exit 1; \
1243 fi; \
Masahiro Yamadaad774082018-12-31 17:24:09 +0900[diff] [blame]1244 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1245endef
1246
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200[diff] [blame]1247define filechk_version.h
Sasha Levin9b82f132021-02-05 22:50:32 -0500[diff] [blame]1248 if [ $(SUBLEVEL) -gt 255 ]; then \
1249 echo \#define LINUX_VERSION_CODE $(shell \
Masahiro Yamada207da4c2021-02-27 23:20:23 +0900[diff] [blame]1250 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
Sasha Levin9b82f132021-02-05 22:50:32 -0500[diff] [blame]1251 else \
1252 echo \#define LINUX_VERSION_CODE $(shell \
Masahiro Yamada207da4c2021-02-27 23:20:23 +0900[diff] [blame]1253 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
Sasha Levin9b82f132021-02-05 22:50:32 -0500[diff] [blame]1254 fi; \
1255 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
Sasha Levin88a68672021-02-12 11:29:24 -0500[diff] [blame]1256 ((c) > 255 ? 255 : (c)))'; \
1257 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1258 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1259 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200[diff] [blame]1260endef
1261
Masahiro Yamada207da4c2021-02-27 23:20:23 +0900[diff] [blame]1262$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1263$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
Masahiro Yamada43fee2b2018-07-25 14:16:11 +0900[diff] [blame]1264$(version_h): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1265 $(call filechk,version.h)
1266
Sam Ravnborg273b2812009-10-18 00:52:28 +0200[diff] [blame]1267include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200[diff] [blame]1268 $(call filechk,utsrelease.h)
1269
Vegard Nossum179efcb2008-12-16 12:33:43 +0100[diff] [blame]1270PHONY += headerdep
1271headerdep:
Peter Foley9663d982011-04-26 17:17:11 -0400[diff] [blame]1272 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1273 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +0100[diff] [blame]1274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1275# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +0100[diff] [blame]1276# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +0100[diff] [blame]1277
Sam Ravnborge6883b12008-06-05 16:43:46 +0200[diff] [blame]1278#Default location for installed headers
1279export INSTALL_HDR_PATH = $(objtree)/usr
1280
Masahiro Yamada59b2bd02019-06-04 19:14:02 +0900[diff] [blame]1281quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1282 cmd_headers_install = \
1283 mkdir -p $(INSTALL_HDR_PATH); \
1284 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1285 usr/include $(INSTALL_HDR_PATH)
David Woodhouse6d716272006-09-24 22:16:03 +0100[diff] [blame]1286
David Woodhouse8d730cf2006-06-18 11:58:39 +0100[diff] [blame]1287PHONY += headers_install
Masahiro Yamada59b2bd02019-06-04 19:14:02 +0900[diff] [blame]1288headers_install: headers
1289 $(call cmd,headers_install)
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1291PHONY += archheaders archscripts
1292
Masahiro Yamadaa5bae542019-06-04 19:14:04 +0900[diff] [blame]1293hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1294
Masahiro Yamada59b2bd02019-06-04 19:14:02 +0900[diff] [blame]1295PHONY += headers
1296headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
Masahiro Yamada9d022c52017-10-04 12:56:04 +0900[diff] [blame]1297 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
David Howells10b63952012-10-02 18:01:57 +0100[diff] [blame]1298 $(error Headers not exportable for the $(SRCARCH) architecture))
Masahiro Yamadad5470d12019-06-04 19:14:03 +0900[diff] [blame]1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
Mike Frysinger1f857122007-02-14 00:33:02 -0800[diff] [blame]1301
Masahiro Yamada7ecaf062019-11-07 16:14:41 +0900[diff] [blame]1302# Deprecated. It is no-op now.
David Woodhouse68475352006-06-18 12:02:10 +0100[diff] [blame]1303PHONY += headers_check
Masahiro Yamada7ecaf062019-11-07 16:14:41 +0900[diff] [blame]1304headers_check:
Masahiro Yamada609bbb42021-03-02 23:26:14 +0900[diff] [blame]1305 @echo >&2 "=================== WARNING ==================="
1306 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1307 @echo >&2 "and will be removed after Linux 5.15 release."
1308 @echo >&2 "Please remove headers_check from your scripts."
1309 @echo >&2 "==============================================="
David Woodhouse68475352006-06-18 12:02:10 +0100[diff] [blame]1310
Masahiro Yamadae949f4c2019-06-04 19:13:59 +0900[diff] [blame]1311ifdef CONFIG_HEADERS_INSTALL
Masahiro Yamada59b2bd02019-06-04 19:14:02 +0900[diff] [blame]1312prepare: headers
Masahiro Yamadae949f4c2019-06-04 19:13:59 +0900[diff] [blame]1313endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1314
Masahiro Yamadabdd77142019-06-04 19:14:01 +0900[diff] [blame]1315PHONY += scripts_unifdef
1316scripts_unifdef: scripts_basic
1317 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1319# ---------------------------------------------------------------------------
Masahiro Yamada1bb0b182021-05-12 15:52:00 +0900[diff] [blame]1320# Tools
1321
Masahiro Yamada0d989ac2021-05-12 15:52:01 +0900[diff] [blame]1322ifdef CONFIG_STACK_VALIDATION
1323prepare: tools/objtool
1324endif
1325
1326ifdef CONFIG_BPF
1327ifdef CONFIG_DEBUG_INFO_BTF
1328prepare: tools/bpf/resolve_btfids
1329endif
1330endif
1331
1332PHONY += resolve_btfids_clean
1333
1334resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1335
1336# tools/bpf/resolve_btfids directory might not exist
1337# in output directory, skip its clean in that case
1338resolve_btfids_clean:
1339ifneq ($(wildcard $(resolve_btfids_O)),)
1340 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1341endif
1342
Masahiro Yamada1bb0b182021-05-12 15:52:00 +0900[diff] [blame]1343# Clear a bunch of variables before executing the submake
1344ifeq ($(quiet),silent_)
1345tools_silent=s
1346endif
1347
1348tools/: FORCE
1349 $(Q)mkdir -p $(objtree)/tools
1350 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1351
1352tools/%: FORCE
1353 $(Q)mkdir -p $(objtree)/tools
1354 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1355
1356# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -0600[diff] [blame]1357# Kernel selftest
1358
1359PHONY += kselftest
1360kselftest:
Shuah Khan2bc84522017-09-06 16:44:35 -0600[diff] [blame]1361 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
Shuah Khan5a5da782014-08-07 13:07:46 -0600[diff] [blame]1362
Shuah Khan17eac6c2019-09-26 16:40:14 -0600[diff] [blame]1363kselftest-%: FORCE
1364 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
Wang Longdcb825a2015-10-08 02:41:18 +0000[diff] [blame]1365
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +0800[diff] [blame]1366PHONY += kselftest-merge
1367kselftest-merge:
1368 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
Dan Rue6d3db462019-05-20 10:16:14 -0500[diff] [blame]1369 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1370 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
Masahiro Yamada3e4c6942019-08-21 16:03:48 +0900[diff] [blame]1371 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +0800[diff] [blame]1372
Shuah Khan5a5da782014-08-07 13:07:46 -0600[diff] [blame]1373# ---------------------------------------------------------------------------
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1374# Devicetree files
1375
1376ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1377dtstree := arch/$(SRCARCH)/boot/dts
1378endif
1379
1380ifneq ($(dtstree),)
1381
Masahiro Yamadaa5139fb2019-08-22 13:46:12 +0900[diff] [blame]1382%.dtb: include/config/kernel.release scripts_dtc
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1383 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1384
Viresh Kumarce88c9c2021-01-29 12:54:08 +0530[diff] [blame]1385%.dtbo: include/config/kernel.release scripts_dtc
1386 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1387
Masahiro Yamadac473a8d2020-02-23 04:04:34 +0900[diff] [blame]1388PHONY += dtbs dtbs_install dtbs_check
Masahiro Yamadab5154bf2020-03-04 12:20:36 +0900[diff] [blame]1389dtbs: include/config/kernel.release scripts_dtc
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1390 $(Q)$(MAKE) $(build)=$(dtstree)
1391
Masahiro Yamadab5154bf2020-03-04 12:20:36 +0900[diff] [blame]1392ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
Masahiro Yamadae10c43212020-03-04 12:20:37 +0900[diff] [blame]1393export CHECK_DTBS=y
Masahiro Yamadab5154bf2020-03-04 12:20:36 +0900[diff] [blame]1394dtbs: dt_binding_check
1395endif
1396
Masahiro Yamadab5154bf2020-03-04 12:20:36 +0900[diff] [blame]1397dtbs_check: dtbs
Rob Herring4f0e3a52018-09-06 13:26:07 -0500[diff] [blame]1398
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1399dtbs_install:
Masahiro Yamada2431f222020-03-07 02:08:51 +0900[diff] [blame]1400 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1401
1402ifdef CONFIG_OF_EARLY_FLATTREE
1403all: dtbs
1404endif
1405
1406endif
1407
1408PHONY += scripts_dtc
1409scripts_dtc: scripts_basic
1410 $(Q)$(MAKE) $(build)=scripts/dtc
1411
Masahiro Yamadae10c43212020-03-04 12:20:37 +0900[diff] [blame]1412ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1413export CHECK_DT_BINDING=y
1414endif
1415
Masahiro Yamadac473a8d2020-02-23 04:04:34 +0900[diff] [blame]1416PHONY += dt_binding_check
Rob Herring4f0e3a52018-09-06 13:26:07 -0500[diff] [blame]1417dt_binding_check: scripts_dtc
1418 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1419
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1420# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1421# Modules
1422
1423ifdef CONFIG_MODULES
1424
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200[diff] [blame]1425# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1426
Michal Marek73d13932010-03-10 12:28:58 +0100[diff] [blame]1427all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1428
Masahiro Yamada4b50c8c2020-05-31 17:47:06 +0900[diff] [blame]1429# When we're building modules with modversions, we need to consider
1430# the built-in objects during the descend as well, in order to
1431# make sure the checksums are up to date before we record them.
1432ifdef CONFIG_MODVERSIONS
1433 KBUILD_BUILTIN := 1
1434endif
1435
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900[diff] [blame]1436# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +0900[diff] [blame]1437#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900[diff] [blame]1438# A module can be listed more than once in obj-m resulting in
1439# duplicate lines in modules.order files. Those are removed
1440# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1441
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1442PHONY += modules
Masahiro Yamada596b0472020-09-08 13:27:08 +0900[diff] [blame]1443modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1444
Masahiro Yamadab2c88552020-06-01 14:57:00 +0900[diff] [blame]1445cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1446
1447modules.order: $(subdir-modorder) FORCE
1448 $(call if_changed,modules_order)
1449
1450targets += modules.order
Michal Mareka6c36632010-03-08 10:07:12 +0100[diff] [blame]1451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1452# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1453PHONY += modules_prepare
Masahiro Yamada059bc9fc2018-11-29 12:56:30 +0900[diff] [blame]1454modules_prepare: prepare
Masahiro Yamada596b0472020-09-08 13:27:08 +0900[diff] [blame]1455 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1456
Masahiro Yamada961ab4a2021-03-31 22:38:09 +0900[diff] [blame]1457export modules_sign_only :=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1458
Masahiro Yamada961ab4a2021-03-31 22:38:09 +0900[diff] [blame]1459ifeq ($(CONFIG_MODULE_SIG),y)
1460PHONY += modules_sign
1461modules_sign: modules_install
1462 @:
1463
1464# modules_sign is a subset of modules_install.
1465# 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1466ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1467modules_sign_only := y
1468endif
1469endif
1470
1471modinst_pre :=
1472ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1473modinst_pre := __modinst_pre
1474endif
1475
1476modules_install: $(modinst_pre)
Masahiro Yamada3e3005d2021-03-31 22:38:03 +0900[diff] [blame]1477PHONY += __modinst_pre
1478__modinst_pre:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1479 @rm -rf $(MODLIB)/kernel
1480 @rm -f $(MODLIB)/source
1481 @mkdir -p $(MODLIB)/kernel
Masahiro Yamada8e9b4662017-08-20 15:04:11 +0900[diff] [blame]1482 @ln -s $(abspath $(srctree)) $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1483 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1484 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +0200[diff] [blame]1485 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1486 fi
Masahiro Yamada1bd9a462019-07-17 15:17:50 +0900[diff] [blame]1487 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
Masahiro Yamada2c6d9632020-06-20 00:09:55 +0900[diff] [blame]1488 @cp -f modules.builtin $(MODLIB)/
1489 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1490
1491endif # CONFIG_MODULES
1492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1493###
1494# Cleaning is done on three levels.
1495# make clean Delete most generated files
1496# Leave enough to build external modules
1497# make mrproper Delete the current configuration, and all generated files
1498# make distclean Remove editor backup files, patch leftover files and the like
1499
1500# Directories & files removed with 'make clean'
Masahiro Yamada69bc8d32021-03-26 03:54:09 +0900[diff] [blame]1501CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1502 modules.builtin modules.builtin.modinfo modules.nsdeps \
Masahiro Yamada4c7858b2021-02-26 04:39:12 +0900[diff] [blame]1503 compile_commands.json .thinlto-cache
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1504
1505# Directories & files removed with 'make mrproper'
Masahiro Yamada0663c682020-05-04 17:08:07 +0900[diff] [blame]1506MRPROPER_FILES += include/config include/generated \
Masahiro Yamada46a63d42019-08-21 16:02:02 +0900[diff] [blame]1507 arch/$(SRCARCH)/include/generated .tmp_objdiff \
Masahiro Yamada0663c682020-05-04 17:08:07 +0900[diff] [blame]1508 debian snap tar-install \
1509 .config .config.old .version \
Masahiro Yamada46457132019-07-15 23:01:49 +0900[diff] [blame]1510 Module.symvers \
Nayna Jainb31f2a42021-04-09 10:35:05 -0400[diff] [blame]1511 certs/signing_key.pem certs/signing_key.x509 \
1512 certs/x509.genkey \
1513 vmlinux-gdb.py \
Masahiro Yamada46a63d42019-08-21 16:02:02 +0900[diff] [blame]1514 *.spec
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1515
1516# clean - Delete most, but leave enough to build external modules
1517#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1518clean: rm-files := $(CLEAN_FILES)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1519
Masahiro Yamada76cd3062019-08-11 00:53:05 +0900[diff] [blame]1520PHONY += archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1521
Pawel Mollbd1ee802012-10-29 11:23:02 +0000[diff] [blame]1522vmlinuxclean:
1523 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000[diff] [blame]1524 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +0000[diff] [blame]1525
Jiri Olsa50d3a3f2021-02-05 13:40:20 +0100[diff] [blame]1526clean: archclean vmlinuxclean resolve_btfids_clean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1527
1528# mrproper - Delete all generated files, including .config
1529#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1530mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -0300[diff] [blame]1531mrproper-dirs := $(addprefix _mrproper_,scripts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1532
Masahiro Yamadab421b8a2019-01-14 17:29:29 +0900[diff] [blame]1533PHONY += $(mrproper-dirs) mrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1534$(mrproper-dirs):
1535 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1536
Masahiro Yamadab421b8a2019-01-14 17:29:29 +0900[diff] [blame]1537mrproper: clean $(mrproper-dirs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1538 $(call cmd,rmfiles)
1539
1540# distclean
1541#
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1542PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1543
1544distclean: mrproper
Masahiro Yamada19c8d9122021-05-04 19:10:56 +0900[diff] [blame]1545 @find . $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200[diff] [blame]1546 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Masahiro Yamadaf78271d2017-01-22 23:02:32 +0900[diff] [blame]1547 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
Masahiro Yamada7a02cec2021-05-04 19:10:57 +0900[diff] [blame]1548 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1549 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1550 -type f -print | xargs rm -f
1551
1552
1553# Packaging of the kernel to various formats
1554# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1555
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -0300[diff] [blame]1556%src-pkg: FORCE
Masahiro Yamada000ec952019-08-21 16:02:04 +0900[diff] [blame]1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
Zach Brown031ecc62006-06-08 22:12:37 -0700[diff] [blame]1558%pkg: include/config/kernel.release FORCE
Masahiro Yamada000ec952019-08-21 16:02:04 +0900[diff] [blame]1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1560
1561# Brief documentation of the typical targets used
1562# ---------------------------------------------------------------------------
1563
Segher Boessenkool5dffbe82008-04-06 22:16:07 +0200[diff] [blame]1564boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +0400[diff] [blame]1565boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +0200[diff] [blame]1566board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1567board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1568
Masahiro Yamadafe69b422016-03-13 09:39:55 +0900[diff] [blame]1569PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1570help:
1571 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +0100[diff] [blame]1572 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +0200[diff] [blame]1573 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +0100[diff] [blame]1574 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +0200[diff] [blame]1575 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1576 @echo ''
1577 @echo 'Configuration targets:'
1578 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1579 @echo ''
1580 @echo 'Other generic targets:'
1581 @echo ' all - Build all targets marked with [*]'
1582 @echo '* vmlinux - Build the bare kernel'
1583 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +0100[diff] [blame]1584 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1585 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a42015-12-11 00:35:19 +0800[diff] [blame]1586 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti433db3e2017-04-24 13:04:58 -0700[diff] [blame]1587 @echo ' dir/file.ll - Build the LLVM assembly file'
1588 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -0800[diff] [blame]1589 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1590 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -0700[diff] [blame]1591 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -0400[diff] [blame]1592 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1593 @echo ' tags/TAGS - Generate tags file for editors'
1594 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +0800[diff] [blame]1595 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +0200[diff] [blame]1596 @echo ' kernelrelease - Output the release version string (use with make -s)'
1597 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1598 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200[diff] [blame]1599 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df32302007-01-29 13:47:01 +0100[diff] [blame]1600 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200[diff] [blame]1601 echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -0700[diff] [blame]1602 @echo 'Static analysers:'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1603 @echo ' checkstack - Generate a list of stack hogs'
Sam Ravnborgaa025e72007-11-14 21:34:55 +0100[diff] [blame]1604 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -0800[diff] [blame]1605 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +0200[diff] [blame]1606 @echo ' export_report - List the usages of all exported symbols'
Nicolas Palix74425ee2010-06-06 17:15:01 +0200[diff] [blame]1607 @echo ' headerdep - Detect inclusion cycles in headers'
Masahiro Yamada7f855fc82017-11-14 18:47:20 +0900[diff] [blame]1608 @echo ' coccicheck - Check with Coccinelle'
Nathan Huckleberry6ad7cbc2020-08-22 23:56:18 +0900[diff] [blame]1609 @echo ' clang-analyzer - Check with clang static analyzer'
1610 @echo ' clang-tidy - Check with clang-tidy'
Nicolas Palix74425ee2010-06-06 17:15:01 +0200[diff] [blame]1611 @echo ''
Matthias Maennicheb8305a2019-09-06 11:32:32 +0100[diff] [blame]1612 @echo 'Tools:'
1613 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1614 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -0700[diff] [blame]1615 @echo 'Kernel selftest:'
Shuah Khane51d8da2020-03-30 12:07:11 -0600[diff] [blame]1616 @echo ' kselftest - Build and run kernel selftest'
1617 @echo ' Build, install, and boot kernel before'
1618 @echo ' running kselftest on it'
1619 @echo ' Run as root for full coverage'
1620 @echo ' kselftest-all - Build kernel selftest'
1621 @echo ' kselftest-install - Build and install kernel selftest'
1622 @echo ' kselftest-clean - Remove all generated kselftest files'
1623 @echo ' kselftest-merge - Merge all the config dependencies of'
1624 @echo ' kselftest to existing .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -0600[diff] [blame]1625 @echo ''
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1626 @$(if $(dtstree), \
1627 echo 'Devicetree:'; \
Stephen Boyd7aa8dd912019-08-13 11:38:25 -0700[diff] [blame]1628 echo '* dtbs - Build device tree blobs for enabled boards'; \
1629 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1630 echo ' dt_binding_check - Validate device tree binding documents'; \
1631 echo ' dtbs_check - Validate device tree source files';\
Rob Herring37c8a5fa2018-01-10 15:19:37 -0600[diff] [blame]1632 echo '')
1633
Randy Dunlap31b8cc82017-05-08 15:55:08 -0700[diff] [blame]1634 @echo 'Userspace tools targets:'
1635 @echo ' use "make tools/help"'
1636 @echo ' or "cd tools; make help"'
1637 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1638 @echo 'Kernel packaging:'
Masahiro Yamada000ec952019-08-21 16:02:04 +0900[diff] [blame]1639 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1640 @echo ''
1641 @echo 'Documentation targets:'
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -0300[diff] [blame]1642 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1643 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -0400[diff] [blame]1644 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1645 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -0400[diff] [blame]1646 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1647 @echo ''
1648 @$(if $(boards), \
1649 $(foreach b, $(boards), \
Geert Uytterhoeven42344482019-10-25 13:53:05 +0200[diff] [blame]1650 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1651 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +0200[diff] [blame]1652 @$(if $(board-dirs), \
1653 $(foreach b, $(board-dirs), \
1654 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1655 printf " %-16s - Show all of the above\\n" help-boards; \
1656 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1657
1658 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200[diff] [blame]1659 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1660 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Geert Uytterhoevena64c0442019-10-25 13:52:32 +0200[diff] [blame]1661 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1662 @echo ' (sparse by default)'
Dustin Kirkland701842e2006-05-23 15:57:23 -0500[diff] [blame]1663 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +0200[diff] [blame]1664 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Masahiro Yamadae27128d2019-09-01 01:25:55 +0900[diff] [blame]1665 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +0200[diff] [blame]1666 @echo ' 1: warnings which may be relevant and do not occur too often'
1667 @echo ' 2: warnings which occur quite often but may still be relevant'
1668 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +0200[diff] [blame]1669 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1670 @echo ''
1671 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1672 @echo 'For further info see the ./README file'
1673
1674
Segher Boessenkool5dffbe82008-04-06 22:16:07 +0200[diff] [blame]1675help-board-dirs := $(addprefix help-,$(board-dirs))
1676
1677help-boards: $(help-board-dirs)
1678
Michal Marekfbae4d52014-11-28 13:31:43 +0100[diff] [blame]1679boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +0200[diff] [blame]1680
1681$(help-board-dirs): help-%:
1682 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1683 @$(if $(boards-per-dir), \
1684 $(foreach b, $(boards-per-dir), \
1685 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1686 echo '')
1687
1688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1689# Documentation targets
1690# ---------------------------------------------------------------------------
Jani Nikulae8939222017-10-09 18:26:15 +0300[diff] [blame]1691DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1692 linkcheckdocs dochelp refcheckdocs
Jani Nikula22cba312016-05-19 15:14:05 +0300[diff] [blame]1693PHONY += $(DOC_TARGETS)
Masahiro Yamadabc7b752a2019-08-22 02:33:21 +0900[diff] [blame]1694$(DOC_TARGETS):
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -0300[diff] [blame]1695 $(Q)$(MAKE) $(build)=Documentation $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1696
Masahiro Yamada67274c02019-02-19 18:33:02 +0900[diff] [blame]1697# Misc
1698# ---------------------------------------------------------------------------
1699
1700PHONY += scripts_gdb
Masahiro Yamada7a739ce2019-06-04 19:13:57 +0900[diff] [blame]1701scripts_gdb: prepare0
Masahiro Yamada1e5ff842019-02-19 18:33:04 +0900[diff] [blame]1702 $(Q)$(MAKE) $(build)=scripts/gdb
Masahiro Yamada8d2e5202019-02-19 18:33:05 +0900[diff] [blame]1703 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
Masahiro Yamada67274c02019-02-19 18:33:02 +0900[diff] [blame]1704
1705ifdef CONFIG_GDB_SCRIPTS
1706all: scripts_gdb
1707endif
1708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1709else # KBUILD_EXTMOD
1710
1711###
1712# External module support.
1713# When building external modules the kernel used as basis is considered
1714# read-only, and no consistency checks are made and the make
1715# system is not used on the basis kernel. If updates are required
Masahiro Yamada11122b82021-05-04 19:10:58 +0900[diff] [blame]1716# in the basis kernel ordinary make commands (without M=...) must be used.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1717
Masahiro Yamada62128042020-09-09 05:55:57 +0900[diff] [blame]1718# We are always building only modules.
1719KBUILD_BUILTIN :=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1720KBUILD_MODULES := 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1721
Masahiro Yamadac99f3912019-08-11 00:53:04 +0900[diff] [blame]1722build-dirs := $(KBUILD_EXTMOD)
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1723$(MODORDER): descend
1724 @:
1725
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1726compile_commands.json: $(extmod_prefix)compile_commands.json
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1727PHONY += compile_commands.json
1728
Masahiro Yamada76cd3062019-08-11 00:53:05 +0900[diff] [blame]1729clean-dirs := $(KBUILD_EXTMOD)
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1730clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
Sami Tolvanendc5723b2020-12-11 10:46:19 -0800[diff] [blame]1731 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1732
Masahiro Yamadafe69b422016-03-13 09:39:55 +0900[diff] [blame]1733PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1734help:
1735 @echo ' Building external modules.'
1736 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1737 @echo ''
1738 @echo ' modules - default target, build the module(s)'
1739 @echo ' modules_install - install the module'
1740 @echo ' clean - remove generated files in module directory only'
1741 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +0100[diff] [blame]1742
Masahiro Yamada596b0472020-09-08 13:27:08 +0900[diff] [blame]1743# no-op for external module builds
1744PHONY += prepare modules_prepare
1745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1746endif # KBUILD_EXTMOD
1747
Masahiro Yamada3e3005d2021-03-31 22:38:03 +0900[diff] [blame]1748# ---------------------------------------------------------------------------
1749# Modules
1750
1751PHONY += modules modules_install
1752
1753ifdef CONFIG_MODULES
1754
Masahiro Yamada1a998be2021-03-31 22:38:05 +0900[diff] [blame]1755modules: modules_check
Masahiro Yamada3e3005d2021-03-31 22:38:03 +0900[diff] [blame]1756 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1757
Masahiro Yamada1a998be2021-03-31 22:38:05 +0900[diff] [blame]1758PHONY += modules_check
1759modules_check: $(MODORDER)
1760 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1761
Masahiro Yamada3ac42b22021-03-31 22:38:04 +0900[diff] [blame]1762quiet_cmd_depmod = DEPMOD $(MODLIB)
Masahiro Yamada3e3005d2021-03-31 22:38:03 +0900[diff] [blame]1763 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1764 $(KERNELRELEASE)
1765
1766modules_install:
1767 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1768 $(call cmd,depmod)
1769
1770else # CONFIG_MODULES
1771
1772# Modules not configured
1773# ---------------------------------------------------------------------------
1774
1775modules modules_install:
1776 @echo >&2 '***'
1777 @echo >&2 '*** The present kernel configuration has modules disabled.'
1778 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1779 @echo >&2 '*** to enable CONFIG_MODULES.'
1780 @echo >&2 '***'
1781 @exit 1
1782
1783endif # CONFIG_MODULES
1784
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +0900[diff] [blame]1785# Single targets
1786# ---------------------------------------------------------------------------
1787# To build individual files in subdirectories, you can do like this:
1788#
1789# make foo/bar/baz.s
1790#
1791# The supported suffixes for single-target are listed in 'single-targets'
1792#
1793# To build only under specific subdirectories, you can do like this:
1794#
1795# make foo/bar/baz/
1796
1797ifdef single-build
1798
1799# .ko is special because modpost is needed
1800single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1801single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1802
1803$(single-ko): single_modpost
1804 @:
1805$(single-no-ko): descend
1806 @:
1807
1808ifeq ($(KBUILD_EXTMOD),)
1809# For the single build of in-tree modules, use a temporary file to avoid
1810# the situation of modules_install installing an invalid modules.order.
1811MODORDER := .modules.tmp
1812endif
1813
1814PHONY += single_modpost
Masahiro Yamada596b0472020-09-08 13:27:08 +0900[diff] [blame]1815single_modpost: $(single-no-ko) modules_prepare
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1816 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +0900[diff] [blame]1817 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1818
1819KBUILD_MODULES := 1
1820
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1821export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +0900[diff] [blame]1822
1823# trim unrelated directories
1824build-dirs := $(foreach d, $(build-dirs), \
1825 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1826
1827endif
1828
Masahiro Yamadab480fec2020-05-22 10:59:59 +0900[diff] [blame]1829ifndef CONFIG_MODULES
1830KBUILD_MODULES :=
1831endif
1832
Masahiro Yamadac99f3912019-08-11 00:53:04 +0900[diff] [blame]1833# Handle descending into subdirectories listed in $(build-dirs)
1834# Preset locale variables to speed up the build process. Limit locale
1835# tweaks to this spot to avoid wrong language settings when running
1836# make menuconfig etc.
1837# Error messages still appears in the original language
1838PHONY += descend $(build-dirs)
1839descend: $(build-dirs)
1840$(build-dirs): prepare
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +0900[diff] [blame]1841 $(Q)$(MAKE) $(build)=$@ \
Masahiro Yamada20b1be52020-07-08 01:35:08 +0900[diff] [blame]1842 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
Masahiro Yamadab1fbfcb2019-11-18 13:52:47 +0900[diff] [blame]1843 need-builtin=1 need-modorder=1
Masahiro Yamadac99f3912019-08-11 00:53:04 +0900[diff] [blame]1844
Masahiro Yamada76cd3062019-08-11 00:53:05 +0900[diff] [blame]1845clean-dirs := $(addprefix _clean_, $(clean-dirs))
1846PHONY += $(clean-dirs) clean
1847$(clean-dirs):
1848 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1849
Michal Marek88d7be02010-09-06 12:00:08 +0200[diff] [blame]1850clean: $(clean-dirs)
Michal Marek88d7be02010-09-06 12:00:08 +0200[diff] [blame]1851 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -0700[diff] [blame]1852 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Masahiro Yamadaef46d9b2017-11-17 01:49:13 +0900[diff] [blame]1853 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
Rob Herring4f0e3a52018-09-06 13:26:07 -0500[diff] [blame]1854 -o -name '*.ko.*' \
Viresh Kumarce88c9c2021-01-29 12:54:08 +0530[diff] [blame]1855 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
Masahiro Yamadaef46d9b2017-11-17 01:49:13 +0900[diff] [blame]1856 -o -name '*.dwo' -o -name '*.lst' \
Masahiro Yamadabbc55bd2019-10-29 21:38:07 +0900[diff] [blame]1857 -o -name '*.su' -o -name '*.mod' \
Michal Marek88d7be02010-09-06 12:00:08 +0200[diff] [blame]1858 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
Masahiro Yamada9a8dfb32018-03-23 22:04:31 +0900[diff] [blame]1859 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
Masahiro Yamada4fa8bc92018-03-23 22:04:37 +0900[diff] [blame]1860 -o -name '*.asn1.[ch]' \
Michal Marek88d7be02010-09-06 12:00:08 +0200[diff] [blame]1861 -o -name '*.symtypes' -o -name 'modules.order' \
Masahiro Yamada8b41fc42019-12-19 17:33:29 +0900[diff] [blame]1862 -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +0200[diff] [blame]1863 -o -name '*.c.[012]*.*' \
Vinícius Tinti433db3e2017-04-24 13:04:58 -0700[diff] [blame]1864 -o -name '*.ll' \
Sami Tolvanen38e89182020-12-11 10:46:20 -0800[diff] [blame]1865 -o -name '*.gcno' \
1866 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
Michal Marek88d7be02010-09-06 12:00:08 +0200[diff] [blame]1867
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1868# Generate tags for editors
1869# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +0100[diff] [blame]1870quiet_cmd_tags = GEN $@
Masahiro Yamada858805b2019-08-25 22:28:37 +0900[diff] [blame]1871 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1872
Jianbin Kangf4ed1002011-01-14 20:07:05 +0800[diff] [blame]1873tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1874 $(call cmd,tags)
1875
Matthias Maennicheb8305a2019-09-06 11:32:32 +0100[diff] [blame]1876# Script to generate missing namespace dependencies
1877# ---------------------------------------------------------------------------
1878
1879PHONY += nsdeps
Masahiro Yamadabff9c622019-10-29 21:38:06 +0900[diff] [blame]1880nsdeps: export KBUILD_NSDEPS=1
Matthias Maennicheb8305a2019-09-06 11:32:32 +0100[diff] [blame]1881nsdeps: modules
Masahiro Yamadabff9c622019-10-29 21:38:06 +0900[diff] [blame]1882 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
Matthias Maennicheb8305a2019-09-06 11:32:32 +0100[diff] [blame]1883
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1884# Clang Tooling
1885# ---------------------------------------------------------------------------
1886
1887quiet_cmd_gen_compile_commands = GEN $@
1888 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1889
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1890$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1891 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1892 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1893 $(call if_changed,gen_compile_commands)
1894
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1895targets += $(extmod_prefix)compile_commands.json
Masahiro Yamada3d322852020-08-22 23:56:16 +0900[diff] [blame]1896
Nathan Huckleberry6ad7cbc2020-08-22 23:56:18 +0900[diff] [blame]1897PHONY += clang-tidy clang-analyzer
1898
1899ifdef CONFIG_CC_IS_CLANG
1900quiet_cmd_clang_tools = CHECK $<
1901 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1902
Masahiro Yamada7f691802021-03-31 22:38:06 +0900[diff] [blame]1903clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
Nathan Huckleberry6ad7cbc2020-08-22 23:56:18 +0900[diff] [blame]1904 $(call cmd,clang_tools)
1905else
1906clang-tidy clang-analyzer:
1907 @echo "$@ requires CC=clang" >&2
1908 @false
1909endif
1910
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1911# Scripts to check various things for consistency
1912# ---------------------------------------------------------------------------
1913
Jacob Keller7dfbea42020-10-09 17:18:44 -0700[diff] [blame]1914PHONY += includecheck versioncheck coccicheck export_report
Peter Foley279f3dd2011-04-26 17:15:01 -0400[diff] [blame]1915
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1916includecheck:
Peter Foley436f8762011-04-26 17:18:29 -0400[diff] [blame]1917 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1918 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +0100[diff] [blame]1919 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1920
1921versioncheck:
Peter Foley2ee2d2922011-04-26 17:19:28 -0400[diff] [blame]1922 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1923 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +0100[diff] [blame]1924 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1925
Nicolas Palix74425ee2010-06-06 17:15:01 +0200[diff] [blame]1926coccicheck:
Masahiro Yamada858805b2019-08-25 22:28:37 +0900[diff] [blame]1927 $(Q)$(BASH) $(srctree)/scripts/$@
Nicolas Palix74425ee2010-06-06 17:15:01 +0200[diff] [blame]1928
Adrian Bunk295ac052007-08-24 23:04:56 +0200[diff] [blame]1929export_report:
1930 $(PERL) $(srctree)/scripts/export_report.pl
1931
Mike Marciniszync398ff02013-06-24 08:48:37 -0400[diff] [blame]1932PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -0700[diff] [blame]1933
Jeff Dike011e3a92006-12-13 00:34:12 -0800[diff] [blame]1934# UML needs a little special treatment here. It wants to use the host
1935# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1936# else wants $(ARCH), including people doing cross-builds, which means
1937# that $(SUBARCH) doesn't work here.
1938ifeq ($(ARCH), um)
1939CHECKSTACK_ARCH := $(SUBARCH)
1940else
1941CHECKSTACK_ARCH := $(ARCH)
1942endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1943checkstack:
1944 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Masahiro Yamada75dd4742019-07-06 12:07:11 +0900[diff] [blame]1945 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1946
Amerigo Wang7b8ea532010-08-20 05:36:06 -0400[diff] [blame]1947kernelrelease:
1948 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +0800[diff] [blame]1949
Sam Ravnborgcb584552006-01-09 21:20:34 +0100[diff] [blame]1950kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100[diff] [blame]1951 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1952
Mike Marciniszync398ff02013-06-24 08:48:37 -0400[diff] [blame]1953image_name:
1954 @echo $(KBUILD_IMAGE)
1955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1956quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
Masahiro Yamada0663c682020-05-04 17:08:07 +0900[diff] [blame]1957 cmd_rmfiles = rm -rf $(rm-files)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1958
Masahiro Yamada392885e2018-11-30 10:05:22 +0900[diff] [blame]1959# read saved command lines for existing targets
1960existing-targets := $(wildcard $(sort $(targets)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1961
Masahiro Yamadab9999232019-02-22 16:40:08 +0900[diff] [blame]1962-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1963
SZ Lin (林上智)46b7c492020-03-01 00:09:58 +0800[diff] [blame]1964endif # config-build
Masahiro Yamada2042b542019-08-11 00:53:03 +0900[diff] [blame]1965endif # mixed-build
1966endif # need-sub-make
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1967
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1968PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1969FORCE:
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1970
Ulf Magnussonbd412d82018-07-05 12:33:07 +0900[diff] [blame]1971# Declare the contents of the PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400[diff] [blame]1972# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -0500[diff] [blame]1973.PHONY: $(PHONY)