Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 3
4SUBLEVEL = 0
5EXTRAVERSION = -rc4
6NAME = Bobtail Squid
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
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# We are using a recursive build, so we need to do a little thinking
19# to get the ordering right.
20#
21# Most importantly: sub-Makefiles should only ever modify files in
22# their own directory. If in some directory we have a dependency on
23# a file in another dir (which doesn't happen often, but it's often
24# unavoidable when linking the built-in.a targets which finally
25# turn into vmlinux), we will call a sub make in that other dir, and
26# after that we are sure that everything which is in that other dir
27# is now up to date.
28#
29# The only cases where we need to modify files which have global
30# effects are thus separated out and done before the recursive
31# descending is started. They are now explicitly listed as the
32# prepare rule.
33
34ifneq ($(sub_make_done),1)
35
36# Do not use make's built-in rules and variables
37# (this increases performance and avoids hard-to-debug behaviour)
38MAKEFLAGS += -rR
39
40# Avoid funny character set dependencies
41unexport LC_ALL
42LC_COLLATE=C
43LC_NUMERIC=C
44export LC_COLLATE LC_NUMERIC
45
46# Avoid interference with shell env settings
47unexport GREP_OPTIONS
48
49# Beautify output
50# ---------------------------------------------------------------------------
51#
52# Normally, we echo the whole command before executing it. By making
53# that echo $($(quiet)$(cmd)), we now have the possibility to set
54# $(quiet) to choose other forms of output instead, e.g.
55#
56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58#
59# If $(quiet) is empty, the whole command will be printed.
60# If it is set to "quiet_", only the short version will be printed.
61# If it is set to "silent_", nothing will be printed at all, since
62# the variable $(silent_cmd_cc_o_c) doesn't exist.
63#
64# A simple variant is to prefix commands with $(Q) - that's useful
65# for commands that shall be hidden in non-verbose mode.
66#
67# $(Q)ln $@ :<
68#
69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
71#
72# To put more focus on warnings, be less verbose as default
73# Use 'make V=1' to see the full commands
74
75ifeq ("$(origin V)", "command line")
76 KBUILD_VERBOSE = $(V)
77endif
78ifndef KBUILD_VERBOSE
79 KBUILD_VERBOSE = 0
80endif
81
82ifeq ($(KBUILD_VERBOSE),1)
83 quiet =
84 Q =
85else
86 quiet=quiet_
87 Q = @
88endif
89
90# If the user is running make -s (silent mode), suppress echoing of
91# commands
92
93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
94 quiet=silent_
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# Kbuild will save output files in the current working directory.
100# This does not need to match to the root of the kernel source tree.
101#
102# For example, you can do this:
103#
104# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
105#
106# If you want to save output files in a different location, there are
107# two syntaxes to specify it.
108#
109# 1) O=
110# Use "make O=dir/to/store/output/files/"
111#
112# 2) Set KBUILD_OUTPUT
113# Set the environment variable KBUILD_OUTPUT to point to the output directory.
114# export KBUILD_OUTPUT=dir/to/store/output/files/; make
115#
116# The O= assignment takes precedence over the KBUILD_OUTPUT environment
117# variable.
118
119# Do we want to change the working directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124ifneq ($(KBUILD_OUTPUT),)
125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126# expand a shell special character '~'. We use a somewhat tedious way here.
127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128$(if $(abs_objtree),, \
129 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
130
131# $(realpath ...) resolves symlinks
132abs_objtree := $(realpath $(abs_objtree))
133else
134abs_objtree := $(CURDIR)
135endif # ifneq ($(KBUILD_OUTPUT),)
136
137ifeq ($(abs_objtree),$(CURDIR))
138# Suppress "Entering directory ..." unless we are changing the work directory.
139MAKEFLAGS += --no-print-directory
140else
141need-sub-make := 1
142endif
143
144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
145
146ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147$(error source directory cannot contain spaces or colons)
148endif
149
150ifneq ($(abs_srctree),$(abs_objtree))
151# Look for make include files relative to root of kernel src
152#
153# This does not become effective immediately because MAKEFLAGS is re-parsed
154# once after the Makefile is read. We need to invoke sub-make.
155MAKEFLAGS += --include-dir=$(abs_srctree)
156need-sub-make := 1
157endif
158
159ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161# We need to invoke sub-make to avoid implicit rules in the top Makefile.
162need-sub-make := 1
163# Cancel implicit rules for this Makefile.
164$(lastword $(MAKEFILE_LIST)): ;
165endif
166
167export abs_srctree abs_objtree
168export sub_make_done := 1
169
170ifeq ($(need-sub-make),1)
171
172PHONY += $(MAKECMDGOALS) sub-make
173
174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
175 @:
176
177# Invoke a second make in the output directory, passing relevant variables
178sub-make:
179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
180
181endif # need-sub-make
182endif # sub_make_done
183
184# We process the rest of the Makefile if this is the final invocation of make
185ifeq ($(need-sub-make),)
186
187# Do not print "Entering directory ...",
188# but we want to display it when entering to the output directory
189# so that IDEs/editors are able to understand relative filenames.
190MAKEFLAGS += --no-print-directory
191
192# Call a source code checker (by default, "sparse") as part of the
193# C compilation.
194#
195# Use 'make C=1' to enable checking of only re-compiled files.
196# Use 'make C=2' to enable checking of *all* source files, regardless
197# of whether they are re-compiled or not.
198#
199# See the file "Documentation/dev-tools/sparse.rst" for more details,
200# including where to get the "sparse" utility.
201
202ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC = $(C)
204endif
205ifndef KBUILD_CHECKSRC
206 KBUILD_CHECKSRC = 0
207endif
208
209# Use make M=dir to specify directory of external module to build
210# Old syntax make ... SUBDIRS=$PWD is still supported
211# Setting the environment variable KBUILD_EXTMOD take precedence
212ifdef SUBDIRS
213 $(warning ================= WARNING ================)
214 $(warning 'SUBDIRS' will be removed after Linux 5.3)
215 $(warning )
216 $(warning If you are building an individual subdirectory)
217 $(warning in the kernel tree, you can do like this:)
218 $(warning $$ make path/to/dir/you/want/to/build/)
219 $(warning (Do not forget the trailing slash))
220 $(warning )
221 $(warning If you are building an external module,)
222 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
223 $(warning ==========================================)
224 KBUILD_EXTMOD ?= $(SUBDIRS)
225endif
226
227ifeq ("$(origin M)", "command line")
228 KBUILD_EXTMOD := $(M)
229endif
230
231export KBUILD_CHECKSRC KBUILD_EXTMOD
232
233ifeq ($(abs_srctree),$(abs_objtree))
234 # building in the source tree
235 srctree := .
236 building_out_of_srctree :=
237else
238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
239 # building in a subdirectory of the source tree
240 srctree := ..
241 else
242 srctree := $(abs_srctree)
243 endif
244 building_out_of_srctree := 1
245endif
246
247ifneq ($(KBUILD_ABS_SRCTREE),)
248srctree := $(abs_srctree)
249endif
250
251objtree := .
252VPATH := $(srctree)
253
254export building_out_of_srctree srctree objtree VPATH
255
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
265old_version_h := include/linux/version.h
266
267clean-targets := %clean mrproper cleandocs
268no-dot-config-targets := $(clean-targets) \
269 cscope gtags TAGS tags help% %docs check% coccicheck \
270 $(version_h) headers headers_% archheaders archscripts \
271 %asm-generic kernelversion %src-pkg
272no-sync-config-targets := $(no-dot-config-targets) install %install \
273 kernelrelease
274
275config-targets := 0
276mixed-targets := 0
277dot-config := 1
278may-sync-config := 1
279
280ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
281 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
282 dot-config := 0
283 endif
284endif
285
286ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
287 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
288 may-sync-config := 0
289 endif
290endif
291
292ifneq ($(KBUILD_EXTMOD),)
293 may-sync-config := 0
294endif
295
296ifeq ($(KBUILD_EXTMOD),)
297 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
298 config-targets := 1
299 ifneq ($(words $(MAKECMDGOALS)),1)
300 mixed-targets := 1
301 endif
302 endif
303endif
304
305# For "make -j clean all", "make -j mrproper defconfig all", etc.
306ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
307 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
308 mixed-targets := 1
309 endif
310endif
311
312# install and modules_install need also be processed one by one
313ifneq ($(filter install,$(MAKECMDGOALS)),)
314 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
315 mixed-targets := 1
316 endif
317endif
318
319ifeq ($(mixed-targets),1)
320# ===========================================================================
321# We're called with mixed targets (*config and build targets).
322# Handle them one by one.
323
324PHONY += $(MAKECMDGOALS) __build_one_by_one
325
326$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
327 @:
328
329__build_one_by_one:
330 $(Q)set -e; \
331 for i in $(MAKECMDGOALS); do \
332 $(MAKE) -f $(srctree)/Makefile $$i; \
333 done
334
335else
336
337include scripts/Kbuild.include
338
339# Read KERNELRELEASE from include/config/kernel.release (if it exists)
340KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
341KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343
344include scripts/subarch.include
345
346# Cross compiling and selecting different set of gcc/bin-utils
347# ---------------------------------------------------------------------------
348#
349# When performing cross compilation for other architectures ARCH shall be set
350# to the target architecture. (See arch/* for the possibilities).
351# ARCH can be set during invocation of make:
352# make ARCH=ia64
353# Another way is to have ARCH set in the environment.
354# The default ARCH is the host where make is executed.
355
356# CROSS_COMPILE specify the prefix used for all executables used
357# during compilation. Only gcc and related bin-utils executables
358# are prefixed with $(CROSS_COMPILE).
359# CROSS_COMPILE can be set on the command line
360# make CROSS_COMPILE=ia64-linux-
361# Alternatively CROSS_COMPILE can be set in the environment.
362# Default value for CROSS_COMPILE is not to prefix executables
363# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
364ARCH ?= $(SUBARCH)
365
366# Architecture as present in compile.h
367UTS_MACHINE := $(ARCH)
368SRCARCH := $(ARCH)
369
370# Additional ARCH settings for x86
371ifeq ($(ARCH),i386)
372 SRCARCH := x86
373endif
374ifeq ($(ARCH),x86_64)
375 SRCARCH := x86
376endif
377
378# Additional ARCH settings for sparc
379ifeq ($(ARCH),sparc32)
380 SRCARCH := sparc
381endif
382ifeq ($(ARCH),sparc64)
383 SRCARCH := sparc
384endif
385
386# Additional ARCH settings for sh
387ifeq ($(ARCH),sh64)
388 SRCARCH := sh
389endif
390
391KCONFIG_CONFIG ?= .config
392export KCONFIG_CONFIG
393
394# SHELL used by kbuild
395CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
396 else if [ -x /bin/bash ]; then echo /bin/bash; \
397 else echo sh; fi ; fi)
398
399HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
400HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
401HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
402
403HOSTCC = gcc
404HOSTCXX = g++
405KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
406 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
407 $(HOSTCFLAGS)
408KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
409KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
410KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
411
412# Make variables (CC, etc...)
413AS = $(CROSS_COMPILE)as
414LD = $(CROSS_COMPILE)ld
415CC = $(CROSS_COMPILE)gcc
416CPP = $(CC) -E
417AR = $(CROSS_COMPILE)ar
418NM = $(CROSS_COMPILE)nm
419STRIP = $(CROSS_COMPILE)strip
420OBJCOPY = $(CROSS_COMPILE)objcopy
421OBJDUMP = $(CROSS_COMPILE)objdump
422OBJSIZE = $(CROSS_COMPILE)size
423PAHOLE = pahole
424LEX = flex
425YACC = bison
426AWK = awk
427INSTALLKERNEL := installkernel
428DEPMOD = /sbin/depmod
429PERL = perl
430PYTHON = python
431PYTHON2 = python2
432PYTHON3 = python3
433CHECK = sparse
434
435CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
436 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
437NOSTDINC_FLAGS :=
438CFLAGS_MODULE =
439AFLAGS_MODULE =
440LDFLAGS_MODULE =
441CFLAGS_KERNEL =
442AFLAGS_KERNEL =
443LDFLAGS_vmlinux =
444
445# Use USERINCLUDE when you must reference the UAPI directories only.
446USERINCLUDE := \
447 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
448 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
449 -I$(srctree)/include/uapi \
450 -I$(objtree)/include/generated/uapi \
451 -include $(srctree)/include/linux/kconfig.h
452
453# Use LINUXINCLUDE when you must reference the include/ directory.
454# Needed to be compatible with the O= option
455LINUXINCLUDE := \
456 -I$(srctree)/arch/$(SRCARCH)/include \
457 -I$(objtree)/arch/$(SRCARCH)/include/generated \
458 $(if $(building_out_of_srctree),-I$(srctree)/include) \
459 -I$(objtree)/include \
460 $(USERINCLUDE)
461
462KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
463KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
464 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
465 -Werror=implicit-function-declaration -Werror=implicit-int \
466 -Wno-format-security \
467 -std=gnu89
468KBUILD_CPPFLAGS := -D__KERNEL__
469KBUILD_AFLAGS_KERNEL :=
470KBUILD_CFLAGS_KERNEL :=
471KBUILD_AFLAGS_MODULE := -DMODULE
472KBUILD_CFLAGS_MODULE := -DMODULE
473KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
474KBUILD_LDFLAGS :=
475GCC_PLUGINS_CFLAGS :=
476CLANG_FLAGS :=
477
478export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
479export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
480export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
481export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
482
483export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
484export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
485export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
486export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
487export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
488export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
489export KBUILD_ARFLAGS
490
491# Files to ignore in find ... statements
492
493export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
494 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
495 -prune -o
496export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
497 --exclude CVS --exclude .pc --exclude .hg --exclude .git
498
499# ===========================================================================
500# Rules shared between *config targets and build targets
501
502# Basic helpers built in scripts/basic/
503PHONY += scripts_basic
504scripts_basic:
505 $(Q)$(MAKE) $(build)=scripts/basic
506 $(Q)rm -f .tmp_quiet_recordmcount
507
508PHONY += outputmakefile
509# outputmakefile generates a Makefile in the output directory, if using a
510# separate output directory. This allows convenient use of make in the
511# output directory.
512# At the same time when output Makefile generated, generate .gitignore to
513# ignore whole output directory
514outputmakefile:
515ifdef building_out_of_srctree
516 $(Q)ln -fsn $(srctree) source
517 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
518 $(Q)test -e .gitignore || \
519 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
520endif
521
522ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
523ifneq ($(CROSS_COMPILE),)
524CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
525GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
526CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
527GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
528endif
529ifneq ($(GCC_TOOLCHAIN),)
530CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
531endif
532ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
533CLANG_FLAGS += -no-integrated-as
534endif
535CLANG_FLAGS += -Werror=unknown-warning-option
536KBUILD_CFLAGS += $(CLANG_FLAGS)
537KBUILD_AFLAGS += $(CLANG_FLAGS)
538export CLANG_FLAGS
539endif
540
541# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
542# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
543# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
544# and from include/config/auto.conf.cmd to detect the compiler upgrade.
545CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
546
547ifeq ($(config-targets),1)
548# ===========================================================================
549# *config targets only - make sure prerequisites are updated, and descend
550# in scripts/kconfig to make the *config target
551
552# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
553# KBUILD_DEFCONFIG may point out an alternative default configuration
554# used for 'make defconfig'
555include arch/$(SRCARCH)/Makefile
556export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
557
558config: scripts_basic outputmakefile FORCE
559 $(Q)$(MAKE) $(build)=scripts/kconfig $@
560
561%config: scripts_basic outputmakefile FORCE
562 $(Q)$(MAKE) $(build)=scripts/kconfig $@
563
564else
565# ===========================================================================
566# Build targets only - this includes vmlinux, arch specific targets, clean
567# targets and others. In general all targets except *config targets.
568
569# If building an external module we do not care about the all: rule
570# but instead _all depend on modules
571PHONY += all
572ifeq ($(KBUILD_EXTMOD),)
573_all: all
574else
575_all: modules
576endif
577
578# Decide whether to build built-in, modular, or both.
579# Normally, just do built-in.
580
581KBUILD_MODULES :=
582KBUILD_BUILTIN := 1
583
584# If we have only "make modules", don't compile built-in objects.
585# When we're building modules with modversions, we need to consider
586# the built-in objects during the descend as well, in order to
587# make sure the checksums are up to date before we record them.
588
589ifeq ($(MAKECMDGOALS),modules)
590 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
591endif
592
593# If we have "make <whatever> modules", compile modules
594# in addition to whatever we do anyway.
595# Just "make" or "make all" shall build modules as well
596
597ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
598 KBUILD_MODULES := 1
599endif
600
601ifeq ($(MAKECMDGOALS),)
602 KBUILD_MODULES := 1
603endif
604
605export KBUILD_MODULES KBUILD_BUILTIN
606
607ifeq ($(dot-config),1)
608include include/config/auto.conf
609endif
610
611ifeq ($(KBUILD_EXTMOD),)
612# Objects we will link into vmlinux / subdirs we need to visit
613init-y := init/
614drivers-y := drivers/ sound/
615drivers-$(CONFIG_SAMPLES) += samples/
616drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
617net-y := net/
618libs-y := lib/
619core-y := usr/
620virt-y := virt/
621endif # KBUILD_EXTMOD
622
623# The all: target is the default when no target is given on the
624# command line.
625# This allow a user to issue only 'make' to build a kernel including modules
626# Defaults to vmlinux, but the arch makefile usually adds further targets
627all: vmlinux
628
629CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
630 $(call cc-option,-fno-tree-loop-im) \
631 $(call cc-disable-warning,maybe-uninitialized,)
632export CFLAGS_GCOV
633
634# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
635ifdef CONFIG_FUNCTION_TRACER
636 CC_FLAGS_FTRACE := -pg
637endif
638
639RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
640RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
641RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
642RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
643RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
644RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
645export RETPOLINE_CFLAGS
646export RETPOLINE_VDSO_CFLAGS
647
648# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
649# values of the respective KBUILD_* variables
650ARCH_CPPFLAGS :=
651ARCH_AFLAGS :=
652ARCH_CFLAGS :=
653include arch/$(SRCARCH)/Makefile
654
655ifeq ($(dot-config),1)
656ifeq ($(may-sync-config),1)
657# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
658# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
659# because some architectures define CROSS_COMPILE there.
660include include/config/auto.conf.cmd
661
662$(KCONFIG_CONFIG):
663 @echo >&2 '***'
664 @echo >&2 '*** Configuration file "$@" not found!'
665 @echo >&2 '***'
666 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
667 @echo >&2 '*** "make menuconfig" or "make xconfig").'
668 @echo >&2 '***'
669 @/bin/false
670
671# The actual configuration files used during the build are stored in
672# include/generated/ and include/config/. Update them if .config is newer than
673# include/config/auto.conf (which mirrors .config).
674#
675# This exploits the 'multi-target pattern rule' trick.
676# The syncconfig should be executed only once to make all the targets.
677%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
678 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
679else
680# External modules and some install targets need include/generated/autoconf.h
681# and include/config/auto.conf but do not care if they are up-to-date.
682# Use auto.conf to trigger the test
683PHONY += include/config/auto.conf
684
685include/config/auto.conf:
686 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
687 echo >&2; \
688 echo >&2 " ERROR: Kernel configuration is invalid."; \
689 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
690 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
691 echo >&2 ; \
692 /bin/false)
693
694endif # may-sync-config
695endif # $(dot-config)
696
697KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
698KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
699KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
700KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
701KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
702
703ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
704KBUILD_CFLAGS += -Os
705else
706KBUILD_CFLAGS += -O2
707endif
708
709ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
710KBUILD_CFLAGS += -Wno-maybe-uninitialized
711endif
712
713# Tell gcc to never replace conditional load with a non-conditional one
714KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
715
716include scripts/Makefile.kcov
717include scripts/Makefile.gcc-plugins
718
719ifdef CONFIG_READABLE_ASM
720# Disable optimizations that make assembler listings hard to read.
721# reorder blocks reorders the control in the function
722# ipa clone creates specialized cloned functions
723# partial inlining inlines only parts of functions
724KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
725 $(call cc-option,-fno-ipa-cp-clone,) \
726 $(call cc-option,-fno-partial-inlining)
727endif
728
729ifneq ($(CONFIG_FRAME_WARN),0)
730KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
731endif
732
733stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
734stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
735stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
736
737KBUILD_CFLAGS += $(stackp-flags-y)
738
739ifdef CONFIG_CC_IS_CLANG
740KBUILD_CPPFLAGS += -Qunused-arguments
741KBUILD_CFLAGS += -Wno-format-invalid-specifier
742KBUILD_CFLAGS += -Wno-gnu
743# Quiet clang warning: comparison of unsigned expression < 0 is always false
744KBUILD_CFLAGS += -Wno-tautological-compare
745# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
746# source of a reference will be _MergedGlobals and not on of the whitelisted names.
747# See modpost pattern 2
748KBUILD_CFLAGS += -mno-global-merge
749else
750
751# These warnings generated too much noise in a regular build.
752# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
753KBUILD_CFLAGS += -Wno-unused-but-set-variable
754endif
755
756KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
757ifdef CONFIG_FRAME_POINTER
758KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
759else
760# Some targets (ARM with Thumb2, for example), can't be built with frame
761# pointers. For those, we don't have FUNCTION_TRACER automatically
762# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
763# incompatible with -fomit-frame-pointer with current GCC, so we don't use
764# -fomit-frame-pointer with FUNCTION_TRACER.
765ifndef CONFIG_FUNCTION_TRACER
766KBUILD_CFLAGS += -fomit-frame-pointer
767endif
768endif
769
770# Initialize all stack variables with a pattern, if desired.
771ifdef CONFIG_INIT_STACK_ALL
772KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
773endif
774
775DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
776
777ifdef CONFIG_DEBUG_INFO
778ifdef CONFIG_DEBUG_INFO_SPLIT
779DEBUG_CFLAGS += -gsplit-dwarf
780else
781DEBUG_CFLAGS += -g
782endif
783KBUILD_AFLAGS += -Wa,-gdwarf-2
784endif
785ifdef CONFIG_DEBUG_INFO_DWARF4
786DEBUG_CFLAGS += -gdwarf-4
787endif
788
789ifdef CONFIG_DEBUG_INFO_REDUCED
790DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
791 $(call cc-option,-fno-var-tracking)
792endif
793
794KBUILD_CFLAGS += $(DEBUG_CFLAGS)
795export DEBUG_CFLAGS
796
797ifdef CONFIG_FUNCTION_TRACER
798ifdef CONFIG_FTRACE_MCOUNT_RECORD
799 # gcc 5 supports generating the mcount tables directly
800 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
801 CC_FLAGS_FTRACE += -mrecord-mcount
802 export CC_USING_RECORD_MCOUNT := 1
803 endif
804 ifdef CONFIG_HAVE_NOP_MCOUNT
805 ifeq ($(call cc-option-yn, -mnop-mcount),y)
806 CC_FLAGS_FTRACE += -mnop-mcount
807 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
808 endif
809 endif
810endif
811ifdef CONFIG_HAVE_FENTRY
812 ifeq ($(call cc-option-yn, -mfentry),y)
813 CC_FLAGS_FTRACE += -mfentry
814 CC_FLAGS_USING += -DCC_USING_FENTRY
815 endif
816endif
817export CC_FLAGS_FTRACE
818KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
819KBUILD_AFLAGS += $(CC_FLAGS_USING)
820ifdef CONFIG_DYNAMIC_FTRACE
821 ifdef CONFIG_HAVE_C_RECORDMCOUNT
822 BUILD_C_RECORDMCOUNT := y
823 export BUILD_C_RECORDMCOUNT
824 endif
825endif
826endif
827
828# We trigger additional mismatches with less inlining
829ifdef CONFIG_DEBUG_SECTION_MISMATCH
830KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
831endif
832
833ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
834KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
835LDFLAGS_vmlinux += --gc-sections
836endif
837
838ifdef CONFIG_LIVEPATCH
839KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
840endif
841
842# arch Makefile may override CC so keep this after arch Makefile is included
843NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
844
845# warn about C99 declaration after statement
846KBUILD_CFLAGS += -Wdeclaration-after-statement
847
848# Warn about unmarked fall-throughs in switch statement.
849KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
850
851# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
852KBUILD_CFLAGS += -Wvla
853
854# disable pointer signed / unsigned warnings in gcc 4.0
855KBUILD_CFLAGS += -Wno-pointer-sign
856
857# disable stringop warnings in gcc 8+
858KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
859
860# disable invalid "can't wrap" optimizations for signed / pointers
861KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
862
863# clang sets -fmerge-all-constants by default as optimization, but this
864# is non-conforming behavior for C and in fact breaks the kernel, so we
865# need to disable it here generally.
866KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
867
868# for gcc -fno-merge-all-constants disables everything, but it is fine
869# to have actual conforming behavior enabled.
870KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
871
872# Make sure -fstack-check isn't enabled (like gentoo apparently did)
873KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
874
875# conserve stack if available
876KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
877
878# Prohibit date/time macros, which would make the build non-deterministic
879KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
880
881# enforce correct pointer usage
882KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
883
884# Require designated initializers for all marked structures
885KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
886
887# change __FILE__ to the relative path from the srctree
888KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
889
890# ensure -fcf-protection is disabled when using retpoline as it is
891# incompatible with -mindirect-branch=thunk-extern
892ifdef CONFIG_RETPOLINE
893KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
894endif
895
896# use the deterministic mode of AR if available
897KBUILD_ARFLAGS := $(call ar-option,D)
898
899include scripts/Makefile.kasan
900include scripts/Makefile.extrawarn
901include scripts/Makefile.ubsan
902
903# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
904# last assignments
905KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
906KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
907KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
908
909KBUILD_LDFLAGS_MODULE += --build-id
910LDFLAGS_vmlinux += --build-id
911
912ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
913LDFLAGS_vmlinux += $(call ld-option, -X,)
914endif
915
916# insure the checker run with the right endianness
917CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
918
919# the checker needs the correct machine size
920CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
921
922# Default kernel image to build when no specific target is given.
923# KBUILD_IMAGE may be overruled on the command line or
924# set in the environment
925# Also any assignments in arch/$(ARCH)/Makefile take precedence over
926# this default value
927export KBUILD_IMAGE ?= vmlinux
928
929#
930# INSTALL_PATH specifies where to place the updated kernel and system map
931# images. Default is /boot, but you can set it to other values
932export INSTALL_PATH ?= /boot
933
934#
935# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
936# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
937# an argument if needed. Otherwise it defaults to the kernel install path
938#
939export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
940
941#
942# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
943# relocations required by build roots. This is not defined in the
944# makefile but the argument can be passed to make if needed.
945#
946
947MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
948export MODLIB
949
950#
951# INSTALL_MOD_STRIP, if defined, will cause modules to be
952# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
953# the default option --strip-debug will be used. Otherwise,
954# INSTALL_MOD_STRIP value will be used as the options to the strip command.
955
956ifdef INSTALL_MOD_STRIP
957ifeq ($(INSTALL_MOD_STRIP),1)
958mod_strip_cmd = $(STRIP) --strip-debug
959else
960mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
961endif # INSTALL_MOD_STRIP=1
962else
963mod_strip_cmd = true
964endif # INSTALL_MOD_STRIP
965export mod_strip_cmd
966
967# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
968# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
969# or CONFIG_MODULE_COMPRESS_XZ.
970
971mod_compress_cmd = true
972ifdef CONFIG_MODULE_COMPRESS
973 ifdef CONFIG_MODULE_COMPRESS_GZIP
974 mod_compress_cmd = gzip -n -f
975 endif # CONFIG_MODULE_COMPRESS_GZIP
976 ifdef CONFIG_MODULE_COMPRESS_XZ
977 mod_compress_cmd = xz -f
978 endif # CONFIG_MODULE_COMPRESS_XZ
979endif # CONFIG_MODULE_COMPRESS
980export mod_compress_cmd
981
982ifdef CONFIG_MODULE_SIG_ALL
983$(eval $(call config_filename,MODULE_SIG_KEY))
984
985mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
986else
987mod_sign_cmd = true
988endif
989export mod_sign_cmd
990
991HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
992
993ifdef CONFIG_STACK_VALIDATION
994 has_libelf := $(call try-run,\
995 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
996 ifeq ($(has_libelf),1)
997 objtool_target := tools/objtool FORCE
998 else
999 SKIP_STACK_VALIDATION := 1
1000 export SKIP_STACK_VALIDATION
1001 endif
1002endif
1003
1004PHONY += prepare0
1005
1006export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
1007
1008ifeq ($(KBUILD_EXTMOD),)
1009core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1010
1011vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1012 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1013 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1014
1015vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1016 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1017 $(drivers-) $(net-) $(libs-) $(virt-))))
1018
1019init-y := $(patsubst %/, %/built-in.a, $(init-y))
1020core-y := $(patsubst %/, %/built-in.a, $(core-y))
1021drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1022net-y := $(patsubst %/, %/built-in.a, $(net-y))
1023libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1024libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1025virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1026
1027# Externally visible symbols (used by link-vmlinux.sh)
1028export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1029 $(drivers-y) $(net-y) $(virt-y)
1030export KBUILD_VMLINUX_LIBS := $(libs-y1)
1031export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1032export LDFLAGS_vmlinux
1033# used by scripts/package/Makefile
1034export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1035
1036vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1037
1038# Recurse until adjust_autoksyms.sh is satisfied
1039PHONY += autoksyms_recursive
1040ifdef CONFIG_TRIM_UNUSED_KSYMS
1041autoksyms_recursive: $(vmlinux-deps) modules.order
1042 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1043 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1044endif
1045
1046# For the kernel to actually contain only the needed exported symbols,
1047# we have to build modules as well to determine what those symbols are.
1048# (this can be evaluated only once include/config/auto.conf has been included)
1049ifdef CONFIG_TRIM_UNUSED_KSYMS
1050 KBUILD_MODULES := 1
1051endif
1052
1053autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1054
1055$(autoksyms_h):
1056 $(Q)mkdir -p $(dir $@)
1057 $(Q)touch $@
1058
1059ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1060
1061# Final link of vmlinux with optional arch pass after final link
1062cmd_link-vmlinux = \
1063 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1064 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1065
1066vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1067 +$(call if_changed,link-vmlinux)
1068
1069targets := vmlinux
1070
1071# The actual objects are generated when descending,
1072# make sure no implicit rule kicks in
1073$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1074
1075# Handle descending into subdirectories listed in $(vmlinux-dirs)
1076# Preset locale variables to speed up the build process. Limit locale
1077# tweaks to this spot to avoid wrong language settings when running
1078# make menuconfig etc.
1079# Error messages still appears in the original language
1080
1081PHONY += $(vmlinux-dirs)
1082$(vmlinux-dirs): prepare
1083 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
1084
1085filechk_kernel.release = \
1086 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1087
1088# Store (new) KERNELRELEASE string in include/config/kernel.release
1089include/config/kernel.release: FORCE
1090 $(call filechk,kernel.release)
1091
1092# Additional helpers built in scripts/
1093# Carefully list dependencies so we do not try to build scripts twice
1094# in parallel
1095PHONY += scripts
1096scripts: scripts_basic scripts_dtc
1097 $(Q)$(MAKE) $(build)=$(@)
1098
1099# Things we need to do before we recursively start building the kernel
1100# or the modules are listed in "prepare".
1101# A multi level approach is used. prepareN is processed before prepareN-1.
1102# archprepare is used in arch Makefiles and when processed asm symlink,
1103# version.h and scripts_basic is processed / created.
1104
1105PHONY += prepare archprepare prepare3
1106
1107# prepare3 is used to check if we are building in a separate output directory,
1108# and if so do:
1109# 1) Check that make has not been executed in the kernel src $(srctree)
1110prepare3: include/config/kernel.release
1111ifdef building_out_of_srctree
1112 @$(kecho) ' Using $(srctree) as source for kernel'
1113 $(Q)if [ -f $(srctree)/.config -o \
1114 -d $(srctree)/include/config -o \
1115 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1116 echo >&2 " $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
1117 echo >&2 " in the '$(srctree)' directory.";\
1118 /bin/false; \
1119 fi;
1120endif
1121
1122archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1123 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1124
1125prepare0: archprepare
1126 $(Q)$(MAKE) $(build)=scripts/mod
1127 $(Q)$(MAKE) $(build)=.
1128
1129# All the preparing..
1130prepare: prepare0 prepare-objtool
1131
1132# Support for using generic headers in asm-generic
1133asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1134
1135PHONY += asm-generic uapi-asm-generic
1136asm-generic: uapi-asm-generic
1137 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1138 generic=include/asm-generic
1139uapi-asm-generic:
1140 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1141 generic=include/uapi/asm-generic
1142
1143PHONY += prepare-objtool
1144prepare-objtool: $(objtool_target)
1145ifeq ($(SKIP_STACK_VALIDATION),1)
1146ifdef CONFIG_UNWINDER_ORC
1147 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1148 @false
1149else
1150 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1151endif
1152endif
1153
1154# Generate some files
1155# ---------------------------------------------------------------------------
1156
1157# KERNELRELEASE can change from a few different places, meaning version.h
1158# needs to be updated, so this check is forced on all builds
1159
1160uts_len := 64
1161define filechk_utsrelease.h
1162 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1163 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1164 exit 1; \
1165 fi; \
1166 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1167endef
1168
1169define filechk_version.h
1170 echo \#define LINUX_VERSION_CODE $(shell \
1171 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1172 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1173endef
1174
1175$(version_h): FORCE
1176 $(call filechk,version.h)
1177 $(Q)rm -f $(old_version_h)
1178
1179include/generated/utsrelease.h: include/config/kernel.release FORCE
1180 $(call filechk,utsrelease.h)
1181
1182PHONY += headerdep
1183headerdep:
1184 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1185 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1186
1187# ---------------------------------------------------------------------------
1188# Kernel headers
1189
1190#Default location for installed headers
1191export INSTALL_HDR_PATH = $(objtree)/usr
1192
1193quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1194 cmd_headers_install = \
1195 mkdir -p $(INSTALL_HDR_PATH); \
1196 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1197 usr/include $(INSTALL_HDR_PATH)
1198
1199PHONY += headers_install
1200headers_install: headers
1201 $(call cmd,headers_install)
1202
1203PHONY += archheaders archscripts
1204
1205hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1206
1207PHONY += headers
1208headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1209 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1210 $(error Headers not exportable for the $(SRCARCH) architecture))
1211 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1212 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1213
1214PHONY += headers_check
1215headers_check: headers
1216 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1217 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1218
1219ifdef CONFIG_HEADERS_INSTALL
1220prepare: headers
1221endif
1222
1223ifdef CONFIG_HEADERS_CHECK
1224all: headers_check
1225endif
1226
1227PHONY += scripts_unifdef
1228scripts_unifdef: scripts_basic
1229 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1230
1231# ---------------------------------------------------------------------------
1232# Kernel selftest
1233
1234PHONY += kselftest
1235kselftest:
1236 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1237
1238PHONY += kselftest-clean
1239kselftest-clean:
1240 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1241
1242PHONY += kselftest-merge
1243kselftest-merge:
1244 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1245 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1246 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1247 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1248
1249# ---------------------------------------------------------------------------
1250# Devicetree files
1251
1252ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1253dtstree := arch/$(SRCARCH)/boot/dts
1254endif
1255
1256ifneq ($(dtstree),)
1257
1258%.dtb: prepare3 scripts_dtc
1259 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1260
1261PHONY += dtbs dtbs_install dt_binding_check
1262dtbs dtbs_check: prepare3 scripts_dtc
1263 $(Q)$(MAKE) $(build)=$(dtstree)
1264
1265dtbs_check: export CHECK_DTBS=1
1266dtbs_check: dt_binding_check
1267
1268dtbs_install:
1269 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1270
1271ifdef CONFIG_OF_EARLY_FLATTREE
1272all: dtbs
1273endif
1274
1275endif
1276
1277PHONY += scripts_dtc
1278scripts_dtc: scripts_basic
1279 $(Q)$(MAKE) $(build)=scripts/dtc
1280
1281dt_binding_check: scripts_dtc
1282 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1283
1284# ---------------------------------------------------------------------------
1285# Modules
1286
1287ifdef CONFIG_MODULES
1288
1289# By default, build modules as well
1290
1291all: modules
1292
1293# Build modules
1294#
1295# A module can be listed more than once in obj-m resulting in
1296# duplicate lines in modules.order files. Those are removed
1297# using awk while concatenating to the final file.
1298
1299PHONY += modules
1300modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1301 @$(kecho) ' Building modules, stage 2.';
1302 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1304
1305modules.order: $(vmlinux-dirs)
1306 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1307
1308modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1309
1310modules.builtin: $(modbuiltin-dirs)
1311 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1312
1313PHONY += $(modbuiltin-dirs)
1314# tristate.conf is not included from this Makefile. Add it as a prerequisite
1315# here to make it self-healing in case somebody accidentally removes it.
1316$(modbuiltin-dirs): include/config/tristate.conf
1317 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1318
1319# Target to prepare building external modules
1320PHONY += modules_prepare
1321modules_prepare: prepare
1322
1323# Target to install modules
1324PHONY += modules_install
1325modules_install: _modinst_ _modinst_post
1326
1327PHONY += _modinst_
1328_modinst_:
1329 @rm -rf $(MODLIB)/kernel
1330 @rm -f $(MODLIB)/source
1331 @mkdir -p $(MODLIB)/kernel
1332 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1333 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1334 rm -f $(MODLIB)/build ; \
1335 ln -s $(CURDIR) $(MODLIB)/build ; \
1336 fi
1337 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1338 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1339 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1340 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1341
1342# This depmod is only for convenience to give the initial
1343# boot a modules.dep even before / is mounted read-write. However the
1344# boot script depmod is the master version.
1345PHONY += _modinst_post
1346_modinst_post: _modinst_
1347 $(call cmd,depmod)
1348
1349ifeq ($(CONFIG_MODULE_SIG), y)
1350PHONY += modules_sign
1351modules_sign:
1352 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1353endif
1354
1355else # CONFIG_MODULES
1356
1357# Modules not configured
1358# ---------------------------------------------------------------------------
1359
1360PHONY += modules modules_install
1361modules modules_install:
1362 @echo >&2
1363 @echo >&2 "The present kernel configuration has modules disabled."
1364 @echo >&2 "Type 'make config' and enable loadable module support."
1365 @echo >&2 "Then build a kernel with module support enabled."
1366 @echo >&2
1367 @exit 1
1368
1369endif # CONFIG_MODULES
1370
1371###
1372# Cleaning is done on three levels.
1373# make clean Delete most generated files
1374# Leave enough to build external modules
1375# make mrproper Delete the current configuration, and all generated files
1376# make distclean Remove editor backup files, patch leftover files and the like
1377
1378# Directories & files removed with 'make clean'
1379CLEAN_DIRS += include/ksym
1380CLEAN_FILES += modules.builtin.modinfo
1381
1382# Directories & files removed with 'make mrproper'
1383MRPROPER_DIRS += include/config include/generated \
1384 arch/$(SRCARCH)/include/generated .tmp_objdiff
1385MRPROPER_FILES += .config .config.old .version \
1386 Module.symvers \
1387 signing_key.pem signing_key.priv signing_key.x509 \
1388 x509.genkey extra_certificates signing_key.x509.keyid \
1389 signing_key.x509.signer vmlinux-gdb.py
1390
1391# Directories & files removed with 'make distclean'
1392DISTCLEAN_DIRS +=
1393DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1394
1395# clean - Delete most, but leave enough to build external modules
1396#
1397clean: rm-dirs := $(CLEAN_DIRS)
1398clean: rm-files := $(CLEAN_FILES)
1399clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs))
1400
1401PHONY += $(clean-dirs) clean archclean vmlinuxclean
1402$(clean-dirs):
1403 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1404
1405vmlinuxclean:
1406 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1407 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1408
1409clean: archclean vmlinuxclean
1410
1411# mrproper - Delete all generated files, including .config
1412#
1413mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1414mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1415mrproper-dirs := $(addprefix _mrproper_,scripts)
1416
1417PHONY += $(mrproper-dirs) mrproper
1418$(mrproper-dirs):
1419 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1420
1421mrproper: clean $(mrproper-dirs)
1422 $(call cmd,rmdirs)
1423 $(call cmd,rmfiles)
1424
1425# distclean
1426#
1427distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS))
1428distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1429
1430PHONY += distclean
1431
1432distclean: mrproper
1433 $(call cmd,rmdirs)
1434 $(call cmd,rmfiles)
1435 @find $(srctree) $(RCS_FIND_IGNORE) \
1436 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1437 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1438 -o -name 'core' \) \
1439 -type f -print | xargs rm -f
1440
1441
1442# Packaging of the kernel to various formats
1443# ---------------------------------------------------------------------------
1444package-dir := scripts/package
1445
1446%src-pkg: FORCE
1447 $(Q)$(MAKE) $(build)=$(package-dir) $@
1448%pkg: include/config/kernel.release FORCE
1449 $(Q)$(MAKE) $(build)=$(package-dir) $@
1450
1451
1452# Brief documentation of the typical targets used
1453# ---------------------------------------------------------------------------
1454
1455boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1456boards := $(sort $(notdir $(boards)))
1457board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1458board-dirs := $(sort $(notdir $(board-dirs:/=)))
1459
1460PHONY += help
1461help:
1462 @echo 'Cleaning targets:'
1463 @echo ' clean - Remove most generated files but keep the config and'
1464 @echo ' enough build support to build external modules'
1465 @echo ' mrproper - Remove all generated files + config + various backup files'
1466 @echo ' distclean - mrproper + remove editor backup and patch files'
1467 @echo ''
1468 @echo 'Configuration targets:'
1469 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1470 @echo ''
1471 @echo 'Other generic targets:'
1472 @echo ' all - Build all targets marked with [*]'
1473 @echo '* vmlinux - Build the bare kernel'
1474 @echo '* modules - Build all modules'
1475 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1476 @echo ' dir/ - Build all files in dir and below'
1477 @echo ' dir/file.[ois] - Build specified target only'
1478 @echo ' dir/file.ll - Build the LLVM assembly file'
1479 @echo ' (requires compiler support for LLVM assembly generation)'
1480 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1481 @echo ' (requires a recent binutils and recent build (System.map))'
1482 @echo ' dir/file.ko - Build module including final link'
1483 @echo ' modules_prepare - Set up for building external modules'
1484 @echo ' tags/TAGS - Generate tags file for editors'
1485 @echo ' cscope - Generate cscope index'
1486 @echo ' gtags - Generate GNU GLOBAL index'
1487 @echo ' kernelrelease - Output the release version string (use with make -s)'
1488 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1489 @echo ' image_name - Output the image name (use with make -s)'
1490 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1491 echo ' (default: $(INSTALL_HDR_PATH))'; \
1492 echo ''
1493 @echo 'Static analysers:'
1494 @echo ' checkstack - Generate a list of stack hogs'
1495 @echo ' namespacecheck - Name space analysis on compiled kernel'
1496 @echo ' versioncheck - Sanity check on version.h usage'
1497 @echo ' includecheck - Check for duplicate included header files'
1498 @echo ' export_report - List the usages of all exported symbols'
1499 @echo ' headers_check - Sanity check on exported headers'
1500 @echo ' headerdep - Detect inclusion cycles in headers'
1501 @echo ' coccicheck - Check with Coccinelle'
1502 @echo ''
1503 @echo 'Kernel selftest:'
1504 @echo ' kselftest - Build and run kernel selftest (run as root)'
1505 @echo ' Build, install, and boot kernel before'
1506 @echo ' running kselftest on it'
1507 @echo ' kselftest-clean - Remove all generated kselftest files'
1508 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1509 @echo ' .config.'
1510 @echo ''
1511 @$(if $(dtstree), \
1512 echo 'Devicetree:'; \
1513 echo '* dtbs - Build device tree blobs for enabled boards'; \
1514 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1515 echo '')
1516
1517 @echo 'Userspace tools targets:'
1518 @echo ' use "make tools/help"'
1519 @echo ' or "cd tools; make help"'
1520 @echo ''
1521 @echo 'Kernel packaging:'
1522 @$(MAKE) $(build)=$(package-dir) help
1523 @echo ''
1524 @echo 'Documentation targets:'
1525 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1526 @echo ''
1527 @echo 'Architecture specific targets ($(SRCARCH)):'
1528 @$(if $(archhelp),$(archhelp),\
1529 echo ' No architecture specific help defined for $(SRCARCH)')
1530 @echo ''
1531 @$(if $(boards), \
1532 $(foreach b, $(boards), \
1533 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1534 echo '')
1535 @$(if $(board-dirs), \
1536 $(foreach b, $(board-dirs), \
1537 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1538 printf " %-16s - Show all of the above\\n" help-boards; \
1539 echo '')
1540
1541 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1542 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1543 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1544 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1545 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1546 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1547 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1548 @echo ' 1: warnings which may be relevant and do not occur too often'
1549 @echo ' 2: warnings which occur quite often but may still be relevant'
1550 @echo ' 3: more obscure warnings, can most likely be ignored'
1551 @echo ' Multiple levels can be combined with W=12 or W=123'
1552 @echo ''
1553 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1554 @echo 'For further info see the ./README file'
1555
1556
1557help-board-dirs := $(addprefix help-,$(board-dirs))
1558
1559help-boards: $(help-board-dirs)
1560
1561boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1562
1563$(help-board-dirs): help-%:
1564 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1565 @$(if $(boards-per-dir), \
1566 $(foreach b, $(boards-per-dir), \
1567 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1568 echo '')
1569
1570
1571# Documentation targets
1572# ---------------------------------------------------------------------------
1573DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1574 linkcheckdocs dochelp refcheckdocs
1575PHONY += $(DOC_TARGETS)
1576$(DOC_TARGETS): scripts_basic FORCE
1577 $(Q)$(MAKE) $(build)=Documentation $@
1578
1579# Misc
1580# ---------------------------------------------------------------------------
1581
1582PHONY += scripts_gdb
1583scripts_gdb: prepare0
1584 $(Q)$(MAKE) $(build)=scripts/gdb
1585 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1586
1587ifdef CONFIG_GDB_SCRIPTS
1588all: scripts_gdb
1589endif
1590
1591else # KBUILD_EXTMOD
1592
1593###
1594# External module support.
1595# When building external modules the kernel used as basis is considered
1596# read-only, and no consistency checks are made and the make
1597# system is not used on the basis kernel. If updates are required
1598# in the basis kernel ordinary make commands (without M=...) must
1599# be used.
1600#
1601# The following are the only valid targets when building external
1602# modules.
1603# make M=dir clean Delete all automatically generated files
1604# make M=dir modules Make all modules in specified dir
1605# make M=dir Same as 'make M=dir modules'
1606# make M=dir modules_install
1607# Install the modules built in the module directory
1608# Assumes install directory is already created
1609
1610# We are always building modules
1611KBUILD_MODULES := 1
1612
1613PHONY += $(objtree)/Module.symvers
1614$(objtree)/Module.symvers:
1615 @test -e $(objtree)/Module.symvers || ( \
1616 echo; \
1617 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1618 echo " is missing; modules will have no dependencies and modversions."; \
1619 echo )
1620
1621module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1622PHONY += $(module-dirs) modules
1623$(module-dirs): prepare $(objtree)/Module.symvers
1624 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
1625
1626modules: $(module-dirs)
1627 @$(kecho) ' Building modules, stage 2.';
1628 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1629
1630PHONY += modules_install
1631modules_install: _emodinst_ _emodinst_post
1632
1633install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1634PHONY += _emodinst_
1635_emodinst_:
1636 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1637 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1638
1639PHONY += _emodinst_post
1640_emodinst_post: _emodinst_
1641 $(call cmd,depmod)
1642
1643clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1644
1645PHONY += $(clean-dirs) clean
1646$(clean-dirs):
1647 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1648
1649clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1650
1651PHONY += help
1652help:
1653 @echo ' Building external modules.'
1654 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1655 @echo ''
1656 @echo ' modules - default target, build the module(s)'
1657 @echo ' modules_install - install the module'
1658 @echo ' clean - remove generated files in module directory only'
1659 @echo ''
1660
1661PHONY += prepare
1662endif # KBUILD_EXTMOD
1663
1664clean: $(clean-dirs)
1665 $(call cmd,rmdirs)
1666 $(call cmd,rmfiles)
1667 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1668 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1669 -o -name '*.ko.*' \
1670 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1671 -o -name '*.dwo' -o -name '*.lst' \
1672 -o -name '*.su' -o -name '*.mod' \
1673 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1674 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1675 -o -name '*.asn1.[ch]' \
1676 -o -name '*.symtypes' -o -name 'modules.order' \
1677 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1678 -o -name '*.c.[012]*.*' \
1679 -o -name '*.ll' \
1680 -o -name '*.gcno' \) -type f -print | xargs rm -f
1681
1682# Generate tags for editors
1683# ---------------------------------------------------------------------------
1684quiet_cmd_tags = GEN $@
1685 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1686
1687tags TAGS cscope gtags: FORCE
1688 $(call cmd,tags)
1689
1690# Scripts to check various things for consistency
1691# ---------------------------------------------------------------------------
1692
1693PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1694
1695includecheck:
1696 find $(srctree)/* $(RCS_FIND_IGNORE) \
1697 -name '*.[hcS]' -type f -print | sort \
1698 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1699
1700versioncheck:
1701 find $(srctree)/* $(RCS_FIND_IGNORE) \
1702 -name '*.[hcS]' -type f -print | sort \
1703 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1704
1705coccicheck:
1706 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1707
1708namespacecheck:
1709 $(PERL) $(srctree)/scripts/namespace.pl
1710
1711export_report:
1712 $(PERL) $(srctree)/scripts/export_report.pl
1713
1714PHONY += checkstack kernelrelease kernelversion image_name
1715
1716# UML needs a little special treatment here. It wants to use the host
1717# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1718# else wants $(ARCH), including people doing cross-builds, which means
1719# that $(SUBARCH) doesn't work here.
1720ifeq ($(ARCH), um)
1721CHECKSTACK_ARCH := $(SUBARCH)
1722else
1723CHECKSTACK_ARCH := $(ARCH)
1724endif
1725checkstack:
1726 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1727 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1728
1729kernelrelease:
1730 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1731
1732kernelversion:
1733 @echo $(KERNELVERSION)
1734
1735image_name:
1736 @echo $(KBUILD_IMAGE)
1737
1738# Clear a bunch of variables before executing the submake
1739
1740ifeq ($(quiet),silent_)
1741tools_silent=s
1742endif
1743
1744tools/: FORCE
1745 $(Q)mkdir -p $(objtree)/tools
1746 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1747
1748tools/%: FORCE
1749 $(Q)mkdir -p $(objtree)/tools
1750 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1751
1752# Single targets
1753# ---------------------------------------------------------------------------
1754# Single targets are compatible with:
1755# - build with mixed source and output
1756# - build with separate output dir 'make O=...'
1757# - external modules
1758#
1759# target-dir => where to store outputfile
1760# build-dir => directory in kernel source tree to use
1761
1762build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1763build-dir = $(patsubst %/,%,$(dir $(build-target)))
1764
1765%.i: prepare FORCE
1766 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1767%.ll: prepare FORCE
1768 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1769%.lst: prepare FORCE
1770 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1771%.o: prepare FORCE
1772 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1773%.s: prepare FORCE
1774 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1775%.symtypes: prepare FORCE
1776 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1777ifeq ($(KBUILD_EXTMOD),)
1778# For the single build of an in-tree module, use a temporary file to avoid
1779# the situation of modules_install installing an invalid modules.order.
1780%.ko: MODORDER := .modules.tmp
1781endif
1782%.ko: prepare FORCE
1783 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
1784 $(Q)echo $(build-target) > $(MODORDER)
1785 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1786
1787# Modules
1788PHONY += /
1789/: ./
1790
1791%/: prepare FORCE
1792 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1793
1794# FIXME Should go into a make.lib or something
1795# ===========================================================================
1796
1797quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1798 cmd_rmdirs = rm -rf $(rm-dirs)
1799
1800quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1801 cmd_rmfiles = rm -f $(rm-files)
1802
1803# Run depmod only if we have System.map and depmod is executable
1804quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1805 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1806 $(KERNELRELEASE)
1807
1808# read saved command lines for existing targets
1809existing-targets := $(wildcard $(sort $(targets)))
1810
1811-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1812
1813endif # ifeq ($(config-targets),1)
1814endif # ifeq ($(mixed-targets),1)
1815endif # need-sub-make
1816
1817PHONY += FORCE
1818FORCE:
1819
1820# Declare the contents of the PHONY variable as phony. We keep that
1821# information in a variable so we can use it in if_changed and friends.
1822.PHONY: $(PHONY)