xref: /openbmc/linux/Makefile (revision 023e4163)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 1
4SUBLEVEL = 0
5EXTRAVERSION = -rc3
6NAME = Shy Crocodile
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 --%,$(MAKEFLAGS))),)
94  quiet=silent_
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is not intended to be used by the regular user (for now),
115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116
117# OK, Make called in directory where kernel src resides
118# Do we want to locate output files in a separate directory?
119ifeq ("$(origin O)", "command line")
120  KBUILD_OUTPUT := $(O)
121endif
122
123ifneq ($(words $(subst :, ,$(CURDIR))), 1)
124  $(error main directory cannot contain spaces nor colons)
125endif
126
127ifneq ($(KBUILD_OUTPUT),)
128# check that the output directory actually exists
129saved-output := $(KBUILD_OUTPUT)
130KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
131								&& pwd)
132$(if $(KBUILD_OUTPUT),, \
133     $(error failed to create output directory "$(saved-output)"))
134
135# Look for make include files relative to root of kernel src
136#
137# This does not become effective immediately because MAKEFLAGS is re-parsed
138# once after the Makefile is read.  It is OK since we are going to invoke
139# 'sub-make' below.
140MAKEFLAGS += --include-dir=$(CURDIR)
141
142need-sub-make := 1
143else
144
145# Do not print "Entering directory ..." at all for in-tree build.
146MAKEFLAGS += --no-print-directory
147
148endif # ifneq ($(KBUILD_OUTPUT),)
149
150ifneq ($(filter 3.%,$(MAKE_VERSION)),)
151# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
152# We need to invoke sub-make to avoid implicit rules in the top Makefile.
153need-sub-make := 1
154# Cancel implicit rules for this Makefile.
155$(lastword $(MAKEFILE_LIST)): ;
156endif
157
158export sub_make_done := 1
159
160ifeq ($(need-sub-make),1)
161
162PHONY += $(MAKECMDGOALS) sub-make
163
164$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
165	@:
166
167# Invoke a second make in the output directory, passing relevant variables
168sub-make:
169	$(Q)$(MAKE) \
170	$(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
171	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
172
173endif # need-sub-make
174endif # sub_make_done
175
176# We process the rest of the Makefile if this is the final invocation of make
177ifeq ($(need-sub-make),)
178
179# Do not print "Entering directory ...",
180# but we want to display it when entering to the output directory
181# so that IDEs/editors are able to understand relative filenames.
182MAKEFLAGS += --no-print-directory
183
184# Call a source code checker (by default, "sparse") as part of the
185# C compilation.
186#
187# Use 'make C=1' to enable checking of only re-compiled files.
188# Use 'make C=2' to enable checking of *all* source files, regardless
189# of whether they are re-compiled or not.
190#
191# See the file "Documentation/dev-tools/sparse.rst" for more details,
192# including where to get the "sparse" utility.
193
194ifeq ("$(origin C)", "command line")
195  KBUILD_CHECKSRC = $(C)
196endif
197ifndef KBUILD_CHECKSRC
198  KBUILD_CHECKSRC = 0
199endif
200
201# Use make M=dir to specify directory of external module to build
202# Old syntax make ... SUBDIRS=$PWD is still supported
203# Setting the environment variable KBUILD_EXTMOD take precedence
204ifdef SUBDIRS
205  $(warning ================= WARNING ================)
206  $(warning 'SUBDIRS' will be removed after Linux 5.3)
207  $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
208  $(warning ==========================================)
209  KBUILD_EXTMOD ?= $(SUBDIRS)
210endif
211
212ifeq ("$(origin M)", "command line")
213  KBUILD_EXTMOD := $(M)
214endif
215
216ifeq ($(KBUILD_SRC),)
217        # building in the source tree
218        srctree := .
219else
220        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
221                # building in a subdirectory of the source tree
222                srctree := ..
223        else
224                srctree := $(KBUILD_SRC)
225        endif
226endif
227
228export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
229
230objtree		:= .
231src		:= $(srctree)
232obj		:= $(objtree)
233
234VPATH		:= $(srctree)
235
236export srctree objtree VPATH
237
238# To make sure we do not include .config for any of the *config targets
239# catch them early, and hand them over to scripts/kconfig/Makefile
240# It is allowed to specify more targets when calling make, including
241# mixing *config targets and build targets.
242# For example 'make oldconfig all'.
243# Detect when mixed targets is specified, and make a second invocation
244# of make so .config is not included in this case either (for *config).
245
246version_h := include/generated/uapi/linux/version.h
247old_version_h := include/linux/version.h
248
249clean-targets := %clean mrproper cleandocs
250no-dot-config-targets := $(clean-targets) \
251			 cscope gtags TAGS tags help% %docs check% coccicheck \
252			 $(version_h) headers_% archheaders archscripts \
253			 %asm-generic kernelversion %src-pkg
254no-sync-config-targets := $(no-dot-config-targets) install %install \
255			   kernelrelease
256
257config-targets  := 0
258mixed-targets   := 0
259dot-config      := 1
260may-sync-config := 1
261
262ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
263	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
264		dot-config := 0
265	endif
266endif
267
268ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
269	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
270		may-sync-config := 0
271	endif
272endif
273
274ifneq ($(KBUILD_EXTMOD),)
275	may-sync-config := 0
276endif
277
278ifeq ($(KBUILD_EXTMOD),)
279        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
280                config-targets := 1
281                ifneq ($(words $(MAKECMDGOALS)),1)
282                        mixed-targets := 1
283                endif
284        endif
285endif
286
287# For "make -j clean all", "make -j mrproper defconfig all", etc.
288ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
289        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
290                mixed-targets := 1
291        endif
292endif
293
294# install and modules_install need also be processed one by one
295ifneq ($(filter install,$(MAKECMDGOALS)),)
296        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
297	        mixed-targets := 1
298        endif
299endif
300
301ifeq ($(mixed-targets),1)
302# ===========================================================================
303# We're called with mixed targets (*config and build targets).
304# Handle them one by one.
305
306PHONY += $(MAKECMDGOALS) __build_one_by_one
307
308$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
309	@:
310
311__build_one_by_one:
312	$(Q)set -e; \
313	for i in $(MAKECMDGOALS); do \
314		$(MAKE) -f $(srctree)/Makefile $$i; \
315	done
316
317else
318
319include scripts/Kbuild.include
320
321# Read KERNELRELEASE from include/config/kernel.release (if it exists)
322KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
323KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
324export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
325
326include scripts/subarch.include
327
328# Cross compiling and selecting different set of gcc/bin-utils
329# ---------------------------------------------------------------------------
330#
331# When performing cross compilation for other architectures ARCH shall be set
332# to the target architecture. (See arch/* for the possibilities).
333# ARCH can be set during invocation of make:
334# make ARCH=ia64
335# Another way is to have ARCH set in the environment.
336# The default ARCH is the host where make is executed.
337
338# CROSS_COMPILE specify the prefix used for all executables used
339# during compilation. Only gcc and related bin-utils executables
340# are prefixed with $(CROSS_COMPILE).
341# CROSS_COMPILE can be set on the command line
342# make CROSS_COMPILE=ia64-linux-
343# Alternatively CROSS_COMPILE can be set in the environment.
344# Default value for CROSS_COMPILE is not to prefix executables
345# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
346ARCH		?= $(SUBARCH)
347
348# Architecture as present in compile.h
349UTS_MACHINE 	:= $(ARCH)
350SRCARCH 	:= $(ARCH)
351
352# Additional ARCH settings for x86
353ifeq ($(ARCH),i386)
354        SRCARCH := x86
355endif
356ifeq ($(ARCH),x86_64)
357        SRCARCH := x86
358endif
359
360# Additional ARCH settings for sparc
361ifeq ($(ARCH),sparc32)
362       SRCARCH := sparc
363endif
364ifeq ($(ARCH),sparc64)
365       SRCARCH := sparc
366endif
367
368# Additional ARCH settings for sh
369ifeq ($(ARCH),sh64)
370       SRCARCH := sh
371endif
372
373KCONFIG_CONFIG	?= .config
374export KCONFIG_CONFIG
375
376# SHELL used by kbuild
377CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
378	  else if [ -x /bin/bash ]; then echo /bin/bash; \
379	  else echo sh; fi ; fi)
380
381HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
382HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
383HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
384
385HOSTCC       = gcc
386HOSTCXX      = g++
387KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
388		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
389		$(HOSTCFLAGS)
390KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
391KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
392KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
393
394# Make variables (CC, etc...)
395AS		= $(CROSS_COMPILE)as
396LD		= $(CROSS_COMPILE)ld
397CC		= $(CROSS_COMPILE)gcc
398CPP		= $(CC) -E
399AR		= $(CROSS_COMPILE)ar
400NM		= $(CROSS_COMPILE)nm
401STRIP		= $(CROSS_COMPILE)strip
402OBJCOPY		= $(CROSS_COMPILE)objcopy
403OBJDUMP		= $(CROSS_COMPILE)objdump
404LEX		= flex
405YACC		= bison
406AWK		= awk
407INSTALLKERNEL  := installkernel
408DEPMOD		= /sbin/depmod
409PERL		= perl
410PYTHON		= python
411PYTHON2		= python2
412PYTHON3		= python3
413CHECK		= sparse
414
415CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
416		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
417NOSTDINC_FLAGS :=
418CFLAGS_MODULE   =
419AFLAGS_MODULE   =
420LDFLAGS_MODULE  =
421CFLAGS_KERNEL	=
422AFLAGS_KERNEL	=
423LDFLAGS_vmlinux =
424
425# Use USERINCLUDE when you must reference the UAPI directories only.
426USERINCLUDE    := \
427		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
428		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
429		-I$(srctree)/include/uapi \
430		-I$(objtree)/include/generated/uapi \
431                -include $(srctree)/include/linux/kconfig.h
432
433# Use LINUXINCLUDE when you must reference the include/ directory.
434# Needed to be compatible with the O= option
435LINUXINCLUDE    := \
436		-I$(srctree)/arch/$(SRCARCH)/include \
437		-I$(objtree)/arch/$(SRCARCH)/include/generated \
438		$(if $(KBUILD_SRC), -I$(srctree)/include) \
439		-I$(objtree)/include \
440		$(USERINCLUDE)
441
442KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
443KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
444		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
445		   -Werror=implicit-function-declaration -Werror=implicit-int \
446		   -Wno-format-security \
447		   -std=gnu89
448KBUILD_CPPFLAGS := -D__KERNEL__
449KBUILD_AFLAGS_KERNEL :=
450KBUILD_CFLAGS_KERNEL :=
451KBUILD_AFLAGS_MODULE  := -DMODULE
452KBUILD_CFLAGS_MODULE  := -DMODULE
453KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
454KBUILD_LDFLAGS :=
455GCC_PLUGINS_CFLAGS :=
456
457export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
458export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
459export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
460export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
461
462export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
463export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
464export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
465export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
466export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
467export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
468export KBUILD_ARFLAGS
469
470# When compiling out-of-tree modules, put MODVERDIR in the module
471# tree rather than in the kernel tree. The kernel tree might
472# even be read-only.
473export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
474
475# Files to ignore in find ... statements
476
477export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
478			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
479			  -prune -o
480export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
481			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
482
483# ===========================================================================
484# Rules shared between *config targets and build targets
485
486# Basic helpers built in scripts/basic/
487PHONY += scripts_basic
488scripts_basic:
489	$(Q)$(MAKE) $(build)=scripts/basic
490	$(Q)rm -f .tmp_quiet_recordmcount
491
492PHONY += outputmakefile
493# outputmakefile generates a Makefile in the output directory, if using a
494# separate output directory. This allows convenient use of make in the
495# output directory.
496# At the same time when output Makefile generated, generate .gitignore to
497# ignore whole output directory
498outputmakefile:
499ifneq ($(KBUILD_SRC),)
500	$(Q)ln -fsn $(srctree) source
501	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
502	$(Q)test -e .gitignore || \
503	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
504endif
505
506ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
507ifneq ($(CROSS_COMPILE),)
508CLANG_FLAGS	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
509GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
510CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
511GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
512endif
513ifneq ($(GCC_TOOLCHAIN),)
514CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
515endif
516CLANG_FLAGS	+= -no-integrated-as
517KBUILD_CFLAGS	+= $(CLANG_FLAGS)
518KBUILD_AFLAGS	+= $(CLANG_FLAGS)
519export CLANG_FLAGS
520endif
521
522RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
523RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
524RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
525RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
526RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
527RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
528export RETPOLINE_CFLAGS
529export RETPOLINE_VDSO_CFLAGS
530
531# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
532# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
533# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
534# and from include/config/auto.conf.cmd to detect the compiler upgrade.
535CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
536
537ifeq ($(config-targets),1)
538# ===========================================================================
539# *config targets only - make sure prerequisites are updated, and descend
540# in scripts/kconfig to make the *config target
541
542# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
543# KBUILD_DEFCONFIG may point out an alternative default configuration
544# used for 'make defconfig'
545include arch/$(SRCARCH)/Makefile
546export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
547
548config: scripts_basic outputmakefile FORCE
549	$(Q)$(MAKE) $(build)=scripts/kconfig $@
550
551%config: scripts_basic outputmakefile FORCE
552	$(Q)$(MAKE) $(build)=scripts/kconfig $@
553
554else
555# ===========================================================================
556# Build targets only - this includes vmlinux, arch specific targets, clean
557# targets and others. In general all targets except *config targets.
558
559# If building an external module we do not care about the all: rule
560# but instead _all depend on modules
561PHONY += all
562ifeq ($(KBUILD_EXTMOD),)
563_all: all
564else
565_all: modules
566endif
567
568# Decide whether to build built-in, modular, or both.
569# Normally, just do built-in.
570
571KBUILD_MODULES :=
572KBUILD_BUILTIN := 1
573
574# If we have only "make modules", don't compile built-in objects.
575# When we're building modules with modversions, we need to consider
576# the built-in objects during the descend as well, in order to
577# make sure the checksums are up to date before we record them.
578
579ifeq ($(MAKECMDGOALS),modules)
580  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
581endif
582
583# If we have "make <whatever> modules", compile modules
584# in addition to whatever we do anyway.
585# Just "make" or "make all" shall build modules as well
586
587ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
588  KBUILD_MODULES := 1
589endif
590
591ifeq ($(MAKECMDGOALS),)
592  KBUILD_MODULES := 1
593endif
594
595export KBUILD_MODULES KBUILD_BUILTIN
596
597ifeq ($(KBUILD_EXTMOD),)
598# Objects we will link into vmlinux / subdirs we need to visit
599init-y		:= init/
600drivers-y	:= drivers/ sound/
601net-y		:= net/
602libs-y		:= lib/
603core-y		:= usr/
604virt-y		:= virt/
605endif # KBUILD_EXTMOD
606
607ifeq ($(dot-config),1)
608include include/config/auto.conf
609endif
610
611# The all: target is the default when no target is given on the
612# command line.
613# This allow a user to issue only 'make' to build a kernel including modules
614# Defaults to vmlinux, but the arch makefile usually adds further targets
615all: vmlinux
616
617CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
618	$(call cc-option,-fno-tree-loop-im) \
619	$(call cc-disable-warning,maybe-uninitialized,)
620export CFLAGS_GCOV
621
622# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
623ifdef CONFIG_FUNCTION_TRACER
624  CC_FLAGS_FTRACE := -pg
625endif
626
627# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
628# values of the respective KBUILD_* variables
629ARCH_CPPFLAGS :=
630ARCH_AFLAGS :=
631ARCH_CFLAGS :=
632include arch/$(SRCARCH)/Makefile
633
634ifeq ($(dot-config),1)
635ifeq ($(may-sync-config),1)
636# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
637# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
638# because some architectures define CROSS_COMPILE there.
639-include include/config/auto.conf.cmd
640
641$(KCONFIG_CONFIG):
642	@echo >&2 '***'
643	@echo >&2 '*** Configuration file "$@" not found!'
644	@echo >&2 '***'
645	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
646	@echo >&2 '*** "make menuconfig" or "make xconfig").'
647	@echo >&2 '***'
648	@/bin/false
649
650# The actual configuration files used during the build are stored in
651# include/generated/ and include/config/. Update them if .config is newer than
652# include/config/auto.conf (which mirrors .config).
653#
654# This exploits the 'multi-target pattern rule' trick.
655# The syncconfig should be executed only once to make all the targets.
656%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
657	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
658else
659# External modules and some install targets need include/generated/autoconf.h
660# and include/config/auto.conf but do not care if they are up-to-date.
661# Use auto.conf to trigger the test
662PHONY += include/config/auto.conf
663
664include/config/auto.conf:
665	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
666	echo >&2;							\
667	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
668	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
669	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
670	echo >&2 ;							\
671	/bin/false)
672
673endif # may-sync-config
674endif # $(dot-config)
675
676KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
677KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
678KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
679KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
680KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
681
682ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
683KBUILD_CFLAGS	+= -Os
684else
685KBUILD_CFLAGS   += -O2
686endif
687
688ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
689KBUILD_CFLAGS   += -Wno-maybe-uninitialized
690endif
691
692# Tell gcc to never replace conditional load with a non-conditional one
693KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
694
695include scripts/Makefile.kcov
696include scripts/Makefile.gcc-plugins
697
698ifdef CONFIG_READABLE_ASM
699# Disable optimizations that make assembler listings hard to read.
700# reorder blocks reorders the control in the function
701# ipa clone creates specialized cloned functions
702# partial inlining inlines only parts of functions
703KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
704                 $(call cc-option,-fno-ipa-cp-clone,) \
705                 $(call cc-option,-fno-partial-inlining)
706endif
707
708ifneq ($(CONFIG_FRAME_WARN),0)
709KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
710endif
711
712stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
713stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
714stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
715
716KBUILD_CFLAGS += $(stackp-flags-y)
717
718ifdef CONFIG_CC_IS_CLANG
719KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
720KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
721KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
722KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
723# Quiet clang warning: comparison of unsigned expression < 0 is always false
724KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
725# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
726# source of a reference will be _MergedGlobals and not on of the whitelisted names.
727# See modpost pattern 2
728KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
729KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
730else
731
732# These warnings generated too much noise in a regular build.
733# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
734KBUILD_CFLAGS += -Wno-unused-but-set-variable
735endif
736
737KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
738ifdef CONFIG_FRAME_POINTER
739KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
740else
741# Some targets (ARM with Thumb2, for example), can't be built with frame
742# pointers.  For those, we don't have FUNCTION_TRACER automatically
743# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
744# incompatible with -fomit-frame-pointer with current GCC, so we don't use
745# -fomit-frame-pointer with FUNCTION_TRACER.
746ifndef CONFIG_FUNCTION_TRACER
747KBUILD_CFLAGS	+= -fomit-frame-pointer
748endif
749endif
750
751DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
752
753ifdef CONFIG_DEBUG_INFO
754ifdef CONFIG_DEBUG_INFO_SPLIT
755DEBUG_CFLAGS	+= -gsplit-dwarf
756else
757DEBUG_CFLAGS	+= -g
758endif
759KBUILD_AFLAGS	+= -Wa,-gdwarf-2
760endif
761ifdef CONFIG_DEBUG_INFO_DWARF4
762DEBUG_CFLAGS	+= -gdwarf-4
763endif
764
765ifdef CONFIG_DEBUG_INFO_REDUCED
766DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
767		   $(call cc-option,-fno-var-tracking)
768endif
769
770KBUILD_CFLAGS += $(DEBUG_CFLAGS)
771export DEBUG_CFLAGS
772
773ifdef CONFIG_FUNCTION_TRACER
774ifdef CONFIG_FTRACE_MCOUNT_RECORD
775  # gcc 5 supports generating the mcount tables directly
776  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
777    CC_FLAGS_FTRACE	+= -mrecord-mcount
778    export CC_USING_RECORD_MCOUNT := 1
779  endif
780  ifdef CONFIG_HAVE_NOP_MCOUNT
781    ifeq ($(call cc-option-yn, -mnop-mcount),y)
782      CC_FLAGS_FTRACE	+= -mnop-mcount
783      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
784    endif
785  endif
786endif
787ifdef CONFIG_HAVE_FENTRY
788  ifeq ($(call cc-option-yn, -mfentry),y)
789    CC_FLAGS_FTRACE	+= -mfentry
790    CC_FLAGS_USING	+= -DCC_USING_FENTRY
791  endif
792endif
793export CC_FLAGS_FTRACE
794KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
795KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
796ifdef CONFIG_DYNAMIC_FTRACE
797	ifdef CONFIG_HAVE_C_RECORDMCOUNT
798		BUILD_C_RECORDMCOUNT := y
799		export BUILD_C_RECORDMCOUNT
800	endif
801endif
802endif
803
804# We trigger additional mismatches with less inlining
805ifdef CONFIG_DEBUG_SECTION_MISMATCH
806KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
807endif
808
809ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
810KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
811LDFLAGS_vmlinux += --gc-sections
812endif
813
814# arch Makefile may override CC so keep this after arch Makefile is included
815NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
816
817# warn about C99 declaration after statement
818KBUILD_CFLAGS += -Wdeclaration-after-statement
819
820# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
821KBUILD_CFLAGS += $(call cc-option,-Wvla)
822
823# disable pointer signed / unsigned warnings in gcc 4.0
824KBUILD_CFLAGS += -Wno-pointer-sign
825
826# disable stringop warnings in gcc 8+
827KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
828
829# disable invalid "can't wrap" optimizations for signed / pointers
830KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
831
832# clang sets -fmerge-all-constants by default as optimization, but this
833# is non-conforming behavior for C and in fact breaks the kernel, so we
834# need to disable it here generally.
835KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
836
837# for gcc -fno-merge-all-constants disables everything, but it is fine
838# to have actual conforming behavior enabled.
839KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
840
841# Make sure -fstack-check isn't enabled (like gentoo apparently did)
842KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
843
844# conserve stack if available
845KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
846
847# Prohibit date/time macros, which would make the build non-deterministic
848KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
849
850# enforce correct pointer usage
851KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
852
853# Require designated initializers for all marked structures
854KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
855
856# change __FILE__ to the relative path from the srctree
857KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
858
859# use the deterministic mode of AR if available
860KBUILD_ARFLAGS := $(call ar-option,D)
861
862include scripts/Makefile.kasan
863include scripts/Makefile.extrawarn
864include scripts/Makefile.ubsan
865
866# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
867# last assignments
868KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
869KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
870KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
871
872# Use --build-id when available.
873LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
874KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
875LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
876
877ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
878LDFLAGS_vmlinux	+= $(call ld-option, -X,)
879endif
880
881# insure the checker run with the right endianness
882CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
883
884# the checker needs the correct machine size
885CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
886
887# Default kernel image to build when no specific target is given.
888# KBUILD_IMAGE may be overruled on the command line or
889# set in the environment
890# Also any assignments in arch/$(ARCH)/Makefile take precedence over
891# this default value
892export KBUILD_IMAGE ?= vmlinux
893
894#
895# INSTALL_PATH specifies where to place the updated kernel and system map
896# images. Default is /boot, but you can set it to other values
897export	INSTALL_PATH ?= /boot
898
899#
900# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
901# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
902# an argument if needed. Otherwise it defaults to the kernel install path
903#
904export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
905
906#
907# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
908# relocations required by build roots.  This is not defined in the
909# makefile but the argument can be passed to make if needed.
910#
911
912MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
913export MODLIB
914
915#
916# INSTALL_MOD_STRIP, if defined, will cause modules to be
917# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
918# the default option --strip-debug will be used.  Otherwise,
919# INSTALL_MOD_STRIP value will be used as the options to the strip command.
920
921ifdef INSTALL_MOD_STRIP
922ifeq ($(INSTALL_MOD_STRIP),1)
923mod_strip_cmd = $(STRIP) --strip-debug
924else
925mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
926endif # INSTALL_MOD_STRIP=1
927else
928mod_strip_cmd = true
929endif # INSTALL_MOD_STRIP
930export mod_strip_cmd
931
932# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
933# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
934# or CONFIG_MODULE_COMPRESS_XZ.
935
936mod_compress_cmd = true
937ifdef CONFIG_MODULE_COMPRESS
938  ifdef CONFIG_MODULE_COMPRESS_GZIP
939    mod_compress_cmd = gzip -n -f
940  endif # CONFIG_MODULE_COMPRESS_GZIP
941  ifdef CONFIG_MODULE_COMPRESS_XZ
942    mod_compress_cmd = xz -f
943  endif # CONFIG_MODULE_COMPRESS_XZ
944endif # CONFIG_MODULE_COMPRESS
945export mod_compress_cmd
946
947ifdef CONFIG_MODULE_SIG_ALL
948$(eval $(call config_filename,MODULE_SIG_KEY))
949
950mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
951else
952mod_sign_cmd = true
953endif
954export mod_sign_cmd
955
956HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
957
958ifdef CONFIG_STACK_VALIDATION
959  has_libelf := $(call try-run,\
960		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
961  ifeq ($(has_libelf),1)
962    objtool_target := tools/objtool FORCE
963  else
964    SKIP_STACK_VALIDATION := 1
965    export SKIP_STACK_VALIDATION
966  endif
967endif
968
969PHONY += prepare0
970
971ifeq ($(KBUILD_EXTMOD),)
972core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
973
974vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
975		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
976		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
977
978vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
979		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
980
981init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
982core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
983drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
984net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
985libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
986libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
987virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
988
989# Externally visible symbols (used by link-vmlinux.sh)
990export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
991			      $(drivers-y) $(net-y) $(virt-y)
992export KBUILD_VMLINUX_LIBS := $(libs-y1)
993export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
994export LDFLAGS_vmlinux
995# used by scripts/package/Makefile
996export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
997
998vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
999
1000# Recurse until adjust_autoksyms.sh is satisfied
1001PHONY += autoksyms_recursive
1002autoksyms_recursive: $(vmlinux-deps)
1003ifdef CONFIG_TRIM_UNUSED_KSYMS
1004	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1005	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1006endif
1007
1008# For the kernel to actually contain only the needed exported symbols,
1009# we have to build modules as well to determine what those symbols are.
1010# (this can be evaluated only once include/config/auto.conf has been included)
1011ifdef CONFIG_TRIM_UNUSED_KSYMS
1012  KBUILD_MODULES := 1
1013endif
1014
1015autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1016
1017$(autoksyms_h):
1018	$(Q)mkdir -p $(dir $@)
1019	$(Q)touch $@
1020
1021ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1022
1023# Final link of vmlinux with optional arch pass after final link
1024cmd_link-vmlinux =                                                 \
1025	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1026	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1027
1028vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1029	+$(call if_changed,link-vmlinux)
1030
1031targets := vmlinux
1032
1033# Build samples along the rest of the kernel. This needs headers_install.
1034ifdef CONFIG_SAMPLES
1035vmlinux-dirs += samples
1036samples: headers_install
1037endif
1038
1039# The actual objects are generated when descending,
1040# make sure no implicit rule kicks in
1041$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1042
1043# Handle descending into subdirectories listed in $(vmlinux-dirs)
1044# Preset locale variables to speed up the build process. Limit locale
1045# tweaks to this spot to avoid wrong language settings when running
1046# make menuconfig etc.
1047# Error messages still appears in the original language
1048
1049PHONY += $(vmlinux-dirs)
1050$(vmlinux-dirs): prepare
1051	$(Q)$(MAKE) $(build)=$@ need-builtin=1
1052
1053filechk_kernel.release = \
1054	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1055
1056# Store (new) KERNELRELEASE string in include/config/kernel.release
1057include/config/kernel.release: $(srctree)/Makefile FORCE
1058	$(call filechk,kernel.release)
1059
1060# Additional helpers built in scripts/
1061# Carefully list dependencies so we do not try to build scripts twice
1062# in parallel
1063PHONY += scripts
1064scripts: scripts_basic scripts_dtc
1065	$(Q)$(MAKE) $(build)=$(@)
1066
1067# Things we need to do before we recursively start building the kernel
1068# or the modules are listed in "prepare".
1069# A multi level approach is used. prepareN is processed before prepareN-1.
1070# archprepare is used in arch Makefiles and when processed asm symlink,
1071# version.h and scripts_basic is processed / created.
1072
1073PHONY += prepare archprepare prepare1 prepare3
1074
1075# prepare3 is used to check if we are building in a separate output directory,
1076# and if so do:
1077# 1) Check that make has not been executed in the kernel src $(srctree)
1078prepare3: include/config/kernel.release
1079ifneq ($(KBUILD_SRC),)
1080	@$(kecho) '  Using $(srctree) as source for kernel'
1081	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1082		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1083		echo >&2 "  in the '$(srctree)' directory.";\
1084		/bin/false; \
1085	fi;
1086endif
1087
1088prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1089						include/generated/utsrelease.h
1090	$(cmd_crmodverdir)
1091
1092archprepare: archheaders archscripts prepare1 scripts
1093
1094prepare0: archprepare
1095	$(Q)$(MAKE) $(build)=scripts/mod
1096	$(Q)$(MAKE) $(build)=.
1097
1098# All the preparing..
1099prepare: prepare0 prepare-objtool
1100
1101# Support for using generic headers in asm-generic
1102asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1103
1104PHONY += asm-generic uapi-asm-generic
1105asm-generic: uapi-asm-generic
1106	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1107	generic=include/asm-generic
1108uapi-asm-generic:
1109	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1110	generic=include/uapi/asm-generic
1111
1112PHONY += prepare-objtool
1113prepare-objtool: $(objtool_target)
1114ifeq ($(SKIP_STACK_VALIDATION),1)
1115ifdef CONFIG_UNWINDER_ORC
1116	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1117	@false
1118else
1119	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1120endif
1121endif
1122
1123# Generate some files
1124# ---------------------------------------------------------------------------
1125
1126# KERNELRELEASE can change from a few different places, meaning version.h
1127# needs to be updated, so this check is forced on all builds
1128
1129uts_len := 64
1130define filechk_utsrelease.h
1131	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1132	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1133	  exit 1;                                                         \
1134	fi;                                                               \
1135	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1136endef
1137
1138define filechk_version.h
1139	echo \#define LINUX_VERSION_CODE $(shell                         \
1140	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1141	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1142endef
1143
1144$(version_h): FORCE
1145	$(call filechk,version.h)
1146	$(Q)rm -f $(old_version_h)
1147
1148include/generated/utsrelease.h: include/config/kernel.release FORCE
1149	$(call filechk,utsrelease.h)
1150
1151PHONY += headerdep
1152headerdep:
1153	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1154	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1155
1156# ---------------------------------------------------------------------------
1157# Kernel headers
1158
1159#Default location for installed headers
1160export INSTALL_HDR_PATH = $(objtree)/usr
1161
1162# If we do an all arch process set dst to include/arch-$(SRCARCH)
1163hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1164
1165PHONY += archheaders archscripts
1166
1167PHONY += __headers
1168__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1169	$(Q)$(MAKE) $(build)=scripts build_unifdef
1170
1171PHONY += headers_install_all
1172headers_install_all:
1173	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1174
1175PHONY += headers_install
1176headers_install: __headers
1177	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1178	  $(error Headers not exportable for the $(SRCARCH) architecture))
1179	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1180	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1181
1182PHONY += headers_check_all
1183headers_check_all: headers_install_all
1184	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1185
1186PHONY += headers_check
1187headers_check: headers_install
1188	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1189	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1190
1191ifdef CONFIG_HEADERS_CHECK
1192all: headers_check
1193endif
1194
1195# ---------------------------------------------------------------------------
1196# Kernel selftest
1197
1198PHONY += kselftest
1199kselftest:
1200	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1201
1202PHONY += kselftest-clean
1203kselftest-clean:
1204	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1205
1206PHONY += kselftest-merge
1207kselftest-merge:
1208	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1209	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1210		-m $(objtree)/.config \
1211		$(srctree)/tools/testing/selftests/*/config
1212	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1213
1214# ---------------------------------------------------------------------------
1215# Devicetree files
1216
1217ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1218dtstree := arch/$(SRCARCH)/boot/dts
1219endif
1220
1221ifneq ($(dtstree),)
1222
1223%.dtb: prepare3 scripts_dtc
1224	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1225
1226PHONY += dtbs dtbs_install dt_binding_check
1227dtbs dtbs_check: prepare3 scripts_dtc
1228	$(Q)$(MAKE) $(build)=$(dtstree)
1229
1230dtbs_check: export CHECK_DTBS=1
1231dtbs_check: dt_binding_check
1232
1233dtbs_install:
1234	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
1235
1236ifdef CONFIG_OF_EARLY_FLATTREE
1237all: dtbs
1238endif
1239
1240endif
1241
1242PHONY += scripts_dtc
1243scripts_dtc: scripts_basic
1244	$(Q)$(MAKE) $(build)=scripts/dtc
1245
1246dt_binding_check: scripts_dtc
1247	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1248
1249# ---------------------------------------------------------------------------
1250# Modules
1251
1252ifdef CONFIG_MODULES
1253
1254# By default, build modules as well
1255
1256all: modules
1257
1258# Build modules
1259#
1260# A module can be listed more than once in obj-m resulting in
1261# duplicate lines in modules.order files.  Those are removed
1262# using awk while concatenating to the final file.
1263
1264PHONY += modules
1265modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1266	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1267	@$(kecho) '  Building modules, stage 2.';
1268	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1269
1270modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1271	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1272
1273%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1274	$(Q)$(MAKE) $(modbuiltin)=$*
1275
1276
1277# Target to prepare building external modules
1278PHONY += modules_prepare
1279modules_prepare: prepare
1280
1281# Target to install modules
1282PHONY += modules_install
1283modules_install: _modinst_ _modinst_post
1284
1285PHONY += _modinst_
1286_modinst_:
1287	@rm -rf $(MODLIB)/kernel
1288	@rm -f $(MODLIB)/source
1289	@mkdir -p $(MODLIB)/kernel
1290	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1291	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1292		rm -f $(MODLIB)/build ; \
1293		ln -s $(CURDIR) $(MODLIB)/build ; \
1294	fi
1295	@cp -f $(objtree)/modules.order $(MODLIB)/
1296	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1297	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1298
1299# This depmod is only for convenience to give the initial
1300# boot a modules.dep even before / is mounted read-write.  However the
1301# boot script depmod is the master version.
1302PHONY += _modinst_post
1303_modinst_post: _modinst_
1304	$(call cmd,depmod)
1305
1306ifeq ($(CONFIG_MODULE_SIG), y)
1307PHONY += modules_sign
1308modules_sign:
1309	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1310endif
1311
1312else # CONFIG_MODULES
1313
1314# Modules not configured
1315# ---------------------------------------------------------------------------
1316
1317PHONY += modules modules_install
1318modules modules_install:
1319	@echo >&2
1320	@echo >&2 "The present kernel configuration has modules disabled."
1321	@echo >&2 "Type 'make config' and enable loadable module support."
1322	@echo >&2 "Then build a kernel with module support enabled."
1323	@echo >&2
1324	@exit 1
1325
1326endif # CONFIG_MODULES
1327
1328###
1329# Cleaning is done on three levels.
1330# make clean     Delete most generated files
1331#                Leave enough to build external modules
1332# make mrproper  Delete the current configuration, and all generated files
1333# make distclean Remove editor backup files, patch leftover files and the like
1334
1335# Directories & files removed with 'make clean'
1336CLEAN_DIRS  += $(MODVERDIR) include/ksym
1337
1338# Directories & files removed with 'make mrproper'
1339MRPROPER_DIRS  += include/config usr/include include/generated          \
1340		  arch/*/include/generated .tmp_objdiff
1341MRPROPER_FILES += .config .config.old .version \
1342		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1343		  signing_key.pem signing_key.priv signing_key.x509	\
1344		  x509.genkey extra_certificates signing_key.x509.keyid	\
1345		  signing_key.x509.signer vmlinux-gdb.py
1346
1347# clean - Delete most, but leave enough to build external modules
1348#
1349clean: rm-dirs  := $(CLEAN_DIRS)
1350clean: rm-files := $(CLEAN_FILES)
1351clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1352
1353PHONY += $(clean-dirs) clean archclean vmlinuxclean
1354$(clean-dirs):
1355	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1356
1357vmlinuxclean:
1358	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1359	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1360
1361clean: archclean vmlinuxclean
1362
1363# mrproper - Delete all generated files, including .config
1364#
1365mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1366mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1367mrproper-dirs      := $(addprefix _mrproper_,scripts)
1368
1369PHONY += $(mrproper-dirs) mrproper
1370$(mrproper-dirs):
1371	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1372
1373mrproper: clean $(mrproper-dirs)
1374	$(call cmd,rmdirs)
1375	$(call cmd,rmfiles)
1376
1377# distclean
1378#
1379PHONY += distclean
1380
1381distclean: mrproper
1382	@find $(srctree) $(RCS_FIND_IGNORE) \
1383		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1384		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1385		-o -name 'core' \) \
1386		-type f -print | xargs rm -f
1387
1388
1389# Packaging of the kernel to various formats
1390# ---------------------------------------------------------------------------
1391package-dir	:= scripts/package
1392
1393%src-pkg: FORCE
1394	$(Q)$(MAKE) $(build)=$(package-dir) $@
1395%pkg: include/config/kernel.release FORCE
1396	$(Q)$(MAKE) $(build)=$(package-dir) $@
1397
1398
1399# Brief documentation of the typical targets used
1400# ---------------------------------------------------------------------------
1401
1402boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1403boards := $(sort $(notdir $(boards)))
1404board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1405board-dirs := $(sort $(notdir $(board-dirs:/=)))
1406
1407PHONY += help
1408help:
1409	@echo  'Cleaning targets:'
1410	@echo  '  clean		  - Remove most generated files but keep the config and'
1411	@echo  '                    enough build support to build external modules'
1412	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1413	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1414	@echo  ''
1415	@echo  'Configuration targets:'
1416	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1417	@echo  ''
1418	@echo  'Other generic targets:'
1419	@echo  '  all		  - Build all targets marked with [*]'
1420	@echo  '* vmlinux	  - Build the bare kernel'
1421	@echo  '* modules	  - Build all modules'
1422	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1423	@echo  '  dir/            - Build all files in dir and below'
1424	@echo  '  dir/file.[ois]  - Build specified target only'
1425	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1426	@echo  '                    (requires compiler support for LLVM assembly generation)'
1427	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1428	@echo  '                    (requires a recent binutils and recent build (System.map))'
1429	@echo  '  dir/file.ko     - Build module including final link'
1430	@echo  '  modules_prepare - Set up for building external modules'
1431	@echo  '  tags/TAGS	  - Generate tags file for editors'
1432	@echo  '  cscope	  - Generate cscope index'
1433	@echo  '  gtags           - Generate GNU GLOBAL index'
1434	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1435	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1436	@echo  '  image_name	  - Output the image name (use with make -s)'
1437	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1438	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1439	 echo  ''
1440	@echo  'Static analysers:'
1441	@echo  '  checkstack      - Generate a list of stack hogs'
1442	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1443	@echo  '  versioncheck    - Sanity check on version.h usage'
1444	@echo  '  includecheck    - Check for duplicate included header files'
1445	@echo  '  export_report   - List the usages of all exported symbols'
1446	@echo  '  headers_check   - Sanity check on exported headers'
1447	@echo  '  headerdep       - Detect inclusion cycles in headers'
1448	@echo  '  coccicheck      - Check with Coccinelle'
1449	@echo  ''
1450	@echo  'Kernel selftest:'
1451	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1452	@echo  '                    Build, install, and boot kernel before'
1453	@echo  '                    running kselftest on it'
1454	@echo  '  kselftest-clean - Remove all generated kselftest files'
1455	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1456	@echo  '                    .config.'
1457	@echo  ''
1458	@$(if $(dtstree), \
1459		echo 'Devicetree:'; \
1460		echo '* dtbs            - Build device tree blobs for enabled boards'; \
1461		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1462		echo '')
1463
1464	@echo 'Userspace tools targets:'
1465	@echo '  use "make tools/help"'
1466	@echo '  or  "cd tools; make help"'
1467	@echo  ''
1468	@echo  'Kernel packaging:'
1469	@$(MAKE) $(build)=$(package-dir) help
1470	@echo  ''
1471	@echo  'Documentation targets:'
1472	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1473	@echo  ''
1474	@echo  'Architecture specific targets ($(SRCARCH)):'
1475	@$(if $(archhelp),$(archhelp),\
1476		echo '  No architecture specific help defined for $(SRCARCH)')
1477	@echo  ''
1478	@$(if $(boards), \
1479		$(foreach b, $(boards), \
1480		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1481		echo '')
1482	@$(if $(board-dirs), \
1483		$(foreach b, $(board-dirs), \
1484		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1485		printf "  %-16s - Show all of the above\\n" help-boards; \
1486		echo '')
1487
1488	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1489	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1490	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1491	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1492	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1493	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1494	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1495	@echo  '		1: warnings which may be relevant and do not occur too often'
1496	@echo  '		2: warnings which occur quite often but may still be relevant'
1497	@echo  '		3: more obscure warnings, can most likely be ignored'
1498	@echo  '		Multiple levels can be combined with W=12 or W=123'
1499	@echo  ''
1500	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1501	@echo  'For further info see the ./README file'
1502
1503
1504help-board-dirs := $(addprefix help-,$(board-dirs))
1505
1506help-boards: $(help-board-dirs)
1507
1508boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1509
1510$(help-board-dirs): help-%:
1511	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1512	@$(if $(boards-per-dir), \
1513		$(foreach b, $(boards-per-dir), \
1514		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1515		echo '')
1516
1517
1518# Documentation targets
1519# ---------------------------------------------------------------------------
1520DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1521	       linkcheckdocs dochelp refcheckdocs
1522PHONY += $(DOC_TARGETS)
1523$(DOC_TARGETS): scripts_basic FORCE
1524	$(Q)$(MAKE) $(build)=Documentation $@
1525
1526# Misc
1527# ---------------------------------------------------------------------------
1528
1529PHONY += scripts_gdb
1530scripts_gdb: prepare
1531	$(Q)$(MAKE) $(build)=scripts/gdb
1532	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1533
1534ifdef CONFIG_GDB_SCRIPTS
1535all: scripts_gdb
1536endif
1537
1538else # KBUILD_EXTMOD
1539
1540###
1541# External module support.
1542# When building external modules the kernel used as basis is considered
1543# read-only, and no consistency checks are made and the make
1544# system is not used on the basis kernel. If updates are required
1545# in the basis kernel ordinary make commands (without M=...) must
1546# be used.
1547#
1548# The following are the only valid targets when building external
1549# modules.
1550# make M=dir clean     Delete all automatically generated files
1551# make M=dir modules   Make all modules in specified dir
1552# make M=dir	       Same as 'make M=dir modules'
1553# make M=dir modules_install
1554#                      Install the modules built in the module directory
1555#                      Assumes install directory is already created
1556
1557# We are always building modules
1558KBUILD_MODULES := 1
1559
1560PHONY += $(objtree)/Module.symvers
1561$(objtree)/Module.symvers:
1562	@test -e $(objtree)/Module.symvers || ( \
1563	echo; \
1564	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1565	echo "           is missing; modules will have no dependencies and modversions."; \
1566	echo )
1567
1568module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1569PHONY += $(module-dirs) modules
1570$(module-dirs): prepare $(objtree)/Module.symvers
1571	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1572
1573modules: $(module-dirs)
1574	@$(kecho) '  Building modules, stage 2.';
1575	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1576
1577PHONY += modules_install
1578modules_install: _emodinst_ _emodinst_post
1579
1580install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1581PHONY += _emodinst_
1582_emodinst_:
1583	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1584	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1585
1586PHONY += _emodinst_post
1587_emodinst_post: _emodinst_
1588	$(call cmd,depmod)
1589
1590clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1591
1592PHONY += $(clean-dirs) clean
1593$(clean-dirs):
1594	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1595
1596clean:	rm-dirs := $(MODVERDIR)
1597clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1598
1599PHONY += help
1600help:
1601	@echo  '  Building external modules.'
1602	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1603	@echo  ''
1604	@echo  '  modules         - default target, build the module(s)'
1605	@echo  '  modules_install - install the module'
1606	@echo  '  clean           - remove generated files in module directory only'
1607	@echo  ''
1608
1609PHONY += prepare
1610prepare:
1611	$(cmd_crmodverdir)
1612endif # KBUILD_EXTMOD
1613
1614clean: $(clean-dirs)
1615	$(call cmd,rmdirs)
1616	$(call cmd,rmfiles)
1617	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1618		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1619		-o -name '*.ko.*' \
1620		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1621		-o -name '*.dwo' -o -name '*.lst' \
1622		-o -name '*.su'  \
1623		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1624		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1625		-o -name '*.asn1.[ch]' \
1626		-o -name '*.symtypes' -o -name 'modules.order' \
1627		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1628		-o -name '*.c.[012]*.*' \
1629		-o -name '*.ll' \
1630		-o -name '*.gcno' \) -type f -print | xargs rm -f
1631
1632# Generate tags for editors
1633# ---------------------------------------------------------------------------
1634quiet_cmd_tags = GEN     $@
1635      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1636
1637tags TAGS cscope gtags: FORCE
1638	$(call cmd,tags)
1639
1640# Scripts to check various things for consistency
1641# ---------------------------------------------------------------------------
1642
1643PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1644
1645includecheck:
1646	find $(srctree)/* $(RCS_FIND_IGNORE) \
1647		-name '*.[hcS]' -type f -print | sort \
1648		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1649
1650versioncheck:
1651	find $(srctree)/* $(RCS_FIND_IGNORE) \
1652		-name '*.[hcS]' -type f -print | sort \
1653		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1654
1655coccicheck:
1656	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1657
1658namespacecheck:
1659	$(PERL) $(srctree)/scripts/namespace.pl
1660
1661export_report:
1662	$(PERL) $(srctree)/scripts/export_report.pl
1663
1664PHONY += checkstack kernelrelease kernelversion image_name
1665
1666# UML needs a little special treatment here.  It wants to use the host
1667# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1668# else wants $(ARCH), including people doing cross-builds, which means
1669# that $(SUBARCH) doesn't work here.
1670ifeq ($(ARCH), um)
1671CHECKSTACK_ARCH := $(SUBARCH)
1672else
1673CHECKSTACK_ARCH := $(ARCH)
1674endif
1675checkstack:
1676	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1677	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1678
1679kernelrelease:
1680	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1681
1682kernelversion:
1683	@echo $(KERNELVERSION)
1684
1685image_name:
1686	@echo $(KBUILD_IMAGE)
1687
1688# Clear a bunch of variables before executing the submake
1689
1690ifeq ($(quiet),silent_)
1691tools_silent=s
1692endif
1693
1694tools/: FORCE
1695	$(Q)mkdir -p $(objtree)/tools
1696	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1697
1698tools/%: FORCE
1699	$(Q)mkdir -p $(objtree)/tools
1700	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1701
1702# Single targets
1703# ---------------------------------------------------------------------------
1704# Single targets are compatible with:
1705# - build with mixed source and output
1706# - build with separate output dir 'make O=...'
1707# - external modules
1708#
1709#  target-dir => where to store outputfile
1710#  build-dir  => directory in kernel source tree to use
1711
1712build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1713build-dir = $(patsubst %/,%,$(dir $(build-target)))
1714
1715%.i: prepare FORCE
1716	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1717%.ll: prepare FORCE
1718	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1719%.lst: prepare FORCE
1720	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1721%.o: prepare FORCE
1722	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1723%.s: prepare FORCE
1724	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1725%.symtypes: prepare FORCE
1726	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1727%.ko: %.o
1728	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1729
1730# Modules
1731PHONY += /
1732/: ./
1733
1734# Make sure the latest headers are built for Documentation
1735Documentation/ samples/: headers_install
1736%/: prepare FORCE
1737	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1738
1739# FIXME Should go into a make.lib or something
1740# ===========================================================================
1741
1742quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1743      cmd_rmdirs = rm -rf $(rm-dirs)
1744
1745quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1746      cmd_rmfiles = rm -f $(rm-files)
1747
1748# Run depmod only if we have System.map and depmod is executable
1749quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1750      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1751                   $(KERNELRELEASE)
1752
1753# Create temporary dir for module support files
1754# clean it up only when building all modules
1755cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1756                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1757
1758# read saved command lines for existing targets
1759existing-targets := $(wildcard $(sort $(targets)))
1760
1761-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1762
1763endif   # ifeq ($(config-targets),1)
1764endif   # ifeq ($(mixed-targets),1)
1765endif   # need-sub-make
1766
1767PHONY += FORCE
1768FORCE:
1769
1770# Declare the contents of the PHONY variable as phony.  We keep that
1771# information in a variable so we can use it in if_changed and friends.
1772.PHONY: $(PHONY)
1773