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1# SPDX-License-Identifier: GPL-2.0
2VERSION = 4
3PATCHLEVEL = 19
4SUBLEVEL = 155
5EXTRAVERSION =
6NAME = "People's Front"
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# o Do not use make's built-in rules and variables
19#   (this increases performance and avoids hard-to-debug behaviour);
20# o Look for make include files relative to root of kernel src
21MAKEFLAGS += -rR --include-dir=$(CURDIR)
22
23# Avoid funny character set dependencies
24unexport LC_ALL
25LC_COLLATE=C
26LC_NUMERIC=C
27export LC_COLLATE LC_NUMERIC
28
29# Avoid interference with shell env settings
30unexport GREP_OPTIONS
31
32# We are using a recursive build, so we need to do a little thinking
33# to get the ordering right.
34#
35# Most importantly: sub-Makefiles should only ever modify files in
36# their own directory. If in some directory we have a dependency on
37# a file in another dir (which doesn't happen often, but it's often
38# unavoidable when linking the built-in.a targets which finally
39# turn into vmlinux), we will call a sub make in that other dir, and
40# after that we are sure that everything which is in that other dir
41# is now up to date.
42#
43# The only cases where we need to modify files which have global
44# effects are thus separated out and done before the recursive
45# descending is started. They are now explicitly listed as the
46# prepare rule.
47
48# Beautify output
49# ---------------------------------------------------------------------------
50#
51# Normally, we echo the whole command before executing it. By making
52# that echo $($(quiet)$(cmd)), we now have the possibility to set
53# $(quiet) to choose other forms of output instead, e.g.
54#
55#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
57#
58# If $(quiet) is empty, the whole command will be printed.
59# If it is set to "quiet_", only the short version will be printed.
60# If it is set to "silent_", nothing will be printed at all, since
61# the variable $(silent_cmd_cc_o_c) doesn't exist.
62#
63# A simple variant is to prefix commands with $(Q) - that's useful
64# for commands that shall be hidden in non-verbose mode.
65#
66#	$(Q)ln $@ :<
67#
68# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69# If KBUILD_VERBOSE equals 1 then the above command is displayed.
70#
71# To put more focus on warnings, be less verbose as default
72# Use 'make V=1' to see the full commands
73
74ifeq ("$(origin V)", "command line")
75  KBUILD_VERBOSE = $(V)
76endif
77ifndef KBUILD_VERBOSE
78  KBUILD_VERBOSE = 0
79endif
80
81ifeq ($(KBUILD_VERBOSE),1)
82  quiet =
83  Q =
84else
85  quiet=quiet_
86  Q = @
87endif
88
89# If the user is running make -s (silent mode), suppress echoing of
90# commands
91
92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
93  quiet=silent_
94  tools_silent=s
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is not intended to be used by the regular user (for now),
115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121  KBUILD_OUTPUT := $(O)
122endif
123
124# Cancel implicit rules on top Makefile
125$(CURDIR)/Makefile Makefile: ;
126
127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
128  $(error main directory cannot contain spaces nor colons)
129endif
130
131ifneq ($(KBUILD_OUTPUT),)
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135								&& pwd)
136$(if $(KBUILD_OUTPUT),, \
137     $(error failed to create output directory "$(saved-output)"))
138
139PHONY += $(MAKECMDGOALS) sub-make
140
141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142	@:
143
144# Invoke a second make in the output directory, passing relevant variables
145sub-make:
146	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/dev-tools/sparse.rst" for more details,
170# including where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173  KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176  KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183  KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187  KBUILD_EXTMOD := $(M)
188endif
189
190ifeq ($(KBUILD_SRC),)
191        # building in the source tree
192        srctree := .
193else
194        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
195                # building in a subdirectory of the source tree
196                srctree := ..
197        else
198                srctree := $(KBUILD_SRC)
199        endif
200endif
201
202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
203
204objtree		:= .
205src		:= $(srctree)
206obj		:= $(objtree)
207
208VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
209
210export srctree objtree VPATH
211
212# To make sure we do not include .config for any of the *config targets
213# catch them early, and hand them over to scripts/kconfig/Makefile
214# It is allowed to specify more targets when calling make, including
215# mixing *config targets and build targets.
216# For example 'make oldconfig all'.
217# Detect when mixed targets is specified, and make a second invocation
218# of make so .config is not included in this case either (for *config).
219
220version_h := include/generated/uapi/linux/version.h
221old_version_h := include/linux/version.h
222
223clean-targets := %clean mrproper cleandocs
224no-dot-config-targets := $(clean-targets) \
225			 cscope gtags TAGS tags help% %docs check% coccicheck \
226			 $(version_h) headers_% archheaders archscripts \
227			 %asm-generic kernelversion %src-pkg
228no-sync-config-targets := $(no-dot-config-targets) install %install \
229			   kernelrelease
230
231config-targets  := 0
232mixed-targets   := 0
233dot-config      := 1
234may-sync-config := 1
235
236ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
237	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
238		dot-config := 0
239	endif
240endif
241
242ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
243	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
244		may-sync-config := 0
245	endif
246endif
247
248ifneq ($(KBUILD_EXTMOD),)
249	may-sync-config := 0
250endif
251
252ifeq ($(KBUILD_EXTMOD),)
253        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
254                config-targets := 1
255                ifneq ($(words $(MAKECMDGOALS)),1)
256                        mixed-targets := 1
257                endif
258        endif
259endif
260
261# For "make -j clean all", "make -j mrproper defconfig all", etc.
262ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
263        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
264                mixed-targets := 1
265        endif
266endif
267
268# install and modules_install need also be processed one by one
269ifneq ($(filter install,$(MAKECMDGOALS)),)
270        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
271	        mixed-targets := 1
272        endif
273endif
274
275ifeq ($(mixed-targets),1)
276# ===========================================================================
277# We're called with mixed targets (*config and build targets).
278# Handle them one by one.
279
280PHONY += $(MAKECMDGOALS) __build_one_by_one
281
282$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
283	@:
284
285__build_one_by_one:
286	$(Q)set -e; \
287	for i in $(MAKECMDGOALS); do \
288		$(MAKE) -f $(srctree)/Makefile $$i; \
289	done
290
291else
292
293# We need some generic definitions (do not try to remake the file).
294scripts/Kbuild.include: ;
295include scripts/Kbuild.include
296
297# Read KERNELRELEASE from include/config/kernel.release (if it exists)
298KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
299KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
300export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
301
302include scripts/subarch.include
303
304# Cross compiling and selecting different set of gcc/bin-utils
305# ---------------------------------------------------------------------------
306#
307# When performing cross compilation for other architectures ARCH shall be set
308# to the target architecture. (See arch/* for the possibilities).
309# ARCH can be set during invocation of make:
310# make ARCH=ia64
311# Another way is to have ARCH set in the environment.
312# The default ARCH is the host where make is executed.
313
314# CROSS_COMPILE specify the prefix used for all executables used
315# during compilation. Only gcc and related bin-utils executables
316# are prefixed with $(CROSS_COMPILE).
317# CROSS_COMPILE can be set on the command line
318# make CROSS_COMPILE=ia64-linux-
319# Alternatively CROSS_COMPILE can be set in the environment.
320# Default value for CROSS_COMPILE is not to prefix executables
321# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
322ARCH		?= $(SUBARCH)
323
324# Architecture as present in compile.h
325UTS_MACHINE 	:= $(ARCH)
326SRCARCH 	:= $(ARCH)
327
328# Additional ARCH settings for x86
329ifeq ($(ARCH),i386)
330        SRCARCH := x86
331endif
332ifeq ($(ARCH),x86_64)
333        SRCARCH := x86
334endif
335
336# Additional ARCH settings for sparc
337ifeq ($(ARCH),sparc32)
338       SRCARCH := sparc
339endif
340ifeq ($(ARCH),sparc64)
341       SRCARCH := sparc
342endif
343
344# Additional ARCH settings for sh
345ifeq ($(ARCH),sh64)
346       SRCARCH := sh
347endif
348
349KCONFIG_CONFIG	?= .config
350export KCONFIG_CONFIG
351
352# SHELL used by kbuild
353CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
354	  else if [ -x /bin/bash ]; then echo /bin/bash; \
355	  else echo sh; fi ; fi)
356
357HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
358HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
359HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
360
361ifneq ($(LLVM),)
362HOSTCC	= clang
363HOSTCXX	= clang++
364else
365HOSTCC	= gcc
366HOSTCXX	= g++
367endif
368KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
369		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
370		$(HOSTCFLAGS)
371KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
372KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
373KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
374
375# Make variables (CC, etc...)
376CPP		= $(CC) -E
377ifneq ($(LLVM),)
378CC		= clang
379LD		= ld.lld
380AR		= llvm-ar
381NM		= llvm-nm
382OBJCOPY		= llvm-objcopy
383OBJDUMP		= llvm-objdump
384READELF		= llvm-readelf
385OBJSIZE		= llvm-size
386STRIP		= llvm-strip
387else
388CC		= $(CROSS_COMPILE)gcc
389LD		= $(CROSS_COMPILE)ld
390AR		= $(CROSS_COMPILE)ar
391NM		= $(CROSS_COMPILE)nm
392OBJCOPY		= $(CROSS_COMPILE)objcopy
393OBJDUMP		= $(CROSS_COMPILE)objdump
394READELF		= $(CROSS_COMPILE)readelf
395OBJSIZE		= $(CROSS_COMPILE)size
396STRIP		= $(CROSS_COMPILE)strip
397endif
398LEX		= flex
399YACC		= bison
400AWK		= awk
401GENKSYMS	= scripts/genksyms/genksyms
402INSTALLKERNEL  := installkernel
403DEPMOD		= /sbin/depmod
404PERL		= perl
405PYTHON		= python
406PYTHON2		= python2
407PYTHON3		= python3
408CHECK		= sparse
409
410CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
411		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
412NOSTDINC_FLAGS  =
413CFLAGS_MODULE   =
414AFLAGS_MODULE   =
415LDFLAGS_MODULE  =
416CFLAGS_KERNEL	=
417AFLAGS_KERNEL	=
418LDFLAGS_vmlinux =
419
420# Use USERINCLUDE when you must reference the UAPI directories only.
421USERINCLUDE    := \
422		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
423		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
424		-I$(srctree)/include/uapi \
425		-I$(objtree)/include/generated/uapi \
426                -include $(srctree)/include/linux/kconfig.h
427
428# Use LINUXINCLUDE when you must reference the include/ directory.
429# Needed to be compatible with the O= option
430LINUXINCLUDE    := \
431		-I$(srctree)/arch/$(SRCARCH)/include \
432		-I$(objtree)/arch/$(SRCARCH)/include/generated \
433		$(if $(KBUILD_SRC), -I$(srctree)/include) \
434		-I$(objtree)/include \
435		$(USERINCLUDE)
436
437KBUILD_AFLAGS   := -D__ASSEMBLY__
438KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
439		   -fno-strict-aliasing -fno-common -fshort-wchar \
440		   -Werror-implicit-function-declaration \
441		   -Wno-format-security \
442		   -std=gnu89
443KBUILD_CPPFLAGS := -D__KERNEL__
444KBUILD_AFLAGS_KERNEL :=
445KBUILD_CFLAGS_KERNEL :=
446KBUILD_AFLAGS_MODULE  := -DMODULE
447KBUILD_CFLAGS_MODULE  := -DMODULE
448KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
449KBUILD_LDFLAGS :=
450GCC_PLUGINS_CFLAGS :=
451CLANG_FLAGS :=
452
453export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
454export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
455export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
456export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
457
458export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
459export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
460export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
461export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
462export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
463export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
464export KBUILD_ARFLAGS
465
466# When compiling out-of-tree modules, put MODVERDIR in the module
467# tree rather than in the kernel tree. The kernel tree might
468# even be read-only.
469export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
470
471# Files to ignore in find ... statements
472
473export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
474			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
475			  -prune -o
476export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
477			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
478
479# ===========================================================================
480# Rules shared between *config targets and build targets
481
482# Basic helpers built in scripts/basic/
483PHONY += scripts_basic
484scripts_basic:
485	$(Q)$(MAKE) $(build)=scripts/basic
486	$(Q)rm -f .tmp_quiet_recordmcount
487
488# To avoid any implicit rule to kick in, define an empty command.
489scripts/basic/%: scripts_basic ;
490
491PHONY += outputmakefile
492# outputmakefile generates a Makefile in the output directory, if using a
493# separate output directory. This allows convenient use of make in the
494# output directory.
495outputmakefile:
496ifneq ($(KBUILD_SRC),)
497	$(Q)ln -fsn $(srctree) source
498	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
499	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
500endif
501
502ifeq ($(cc-name),clang)
503ifneq ($(CROSS_COMPILE),)
504CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
505GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
506CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
507GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
508endif
509ifneq ($(GCC_TOOLCHAIN),)
510CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
511endif
512ifneq ($(LLVM_IAS),1)
513CLANG_FLAGS	+= -no-integrated-as
514endif
515CLANG_FLAGS	+= -Werror=unknown-warning-option
516KBUILD_CFLAGS	+= $(CLANG_FLAGS)
517KBUILD_AFLAGS	+= $(CLANG_FLAGS)
518export CLANG_FLAGS
519endif
520
521RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
522RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
523RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
524RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
525RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
526RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
527export RETPOLINE_CFLAGS
528export RETPOLINE_VDSO_CFLAGS
529
530KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
531KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
532
533# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
534# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
535# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
536# and from include/config/auto.conf.cmd to detect the compiler upgrade.
537CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
538
539ifeq ($(config-targets),1)
540# ===========================================================================
541# *config targets only - make sure prerequisites are updated, and descend
542# in scripts/kconfig to make the *config target
543
544# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
545# KBUILD_DEFCONFIG may point out an alternative default configuration
546# used for 'make defconfig'
547include arch/$(SRCARCH)/Makefile
548export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
549
550config: scripts_basic outputmakefile FORCE
551	$(Q)$(MAKE) $(build)=scripts/kconfig $@
552
553%config: scripts_basic outputmakefile FORCE
554	$(Q)$(MAKE) $(build)=scripts/kconfig $@
555
556else
557# ===========================================================================
558# Build targets only - this includes vmlinux, arch specific targets, clean
559# targets and others. In general all targets except *config targets.
560
561# If building an external module we do not care about the all: rule
562# but instead _all depend on modules
563PHONY += all
564ifeq ($(KBUILD_EXTMOD),)
565_all: all
566else
567_all: modules
568endif
569
570# Decide whether to build built-in, modular, or both.
571# Normally, just do built-in.
572
573KBUILD_MODULES :=
574KBUILD_BUILTIN := 1
575
576# If we have only "make modules", don't compile built-in objects.
577ifeq ($(MAKECMDGOALS),modules)
578  KBUILD_BUILTIN :=
579endif
580
581# If we have "make <whatever> modules", compile modules
582# in addition to whatever we do anyway.
583# Just "make" or "make all" shall build modules as well
584
585ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
586  KBUILD_MODULES := 1
587endif
588
589ifeq ($(MAKECMDGOALS),)
590  KBUILD_MODULES := 1
591endif
592
593export KBUILD_MODULES KBUILD_BUILTIN
594
595ifeq ($(KBUILD_EXTMOD),)
596# Objects we will link into vmlinux / subdirs we need to visit
597init-y		:= init/
598drivers-y	:= drivers/ sound/ firmware/
599net-y		:= net/
600libs-y		:= lib/
601core-y		:= usr/
602virt-y		:= virt/
603endif # KBUILD_EXTMOD
604
605ifeq ($(dot-config),1)
606include include/config/auto.conf
607endif
608
609# The all: target is the default when no target is given on the
610# command line.
611# This allow a user to issue only 'make' to build a kernel including modules
612# Defaults to vmlinux, but the arch makefile usually adds further targets
613all: vmlinux
614
615CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
616	$(call cc-option,-fno-tree-loop-im) \
617	$(call cc-disable-warning,maybe-uninitialized,)
618export CFLAGS_GCOV
619
620# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
621ifdef CONFIG_FUNCTION_TRACER
622  CC_FLAGS_FTRACE := -pg
623endif
624
625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
626# values of the respective KBUILD_* variables
627ARCH_CPPFLAGS :=
628ARCH_AFLAGS :=
629ARCH_CFLAGS :=
630include arch/$(SRCARCH)/Makefile
631
632ifeq ($(dot-config),1)
633ifeq ($(may-sync-config),1)
634# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
635# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
636# because some architectures define CROSS_COMPILE there.
637include include/config/auto.conf.cmd
638
639# To avoid any implicit rule to kick in, define an empty command
640$(KCONFIG_CONFIG): ;
641
642# The actual configuration files used during the build are stored in
643# include/generated/ and include/config/. Update them if .config is newer than
644# include/config/auto.conf (which mirrors .config).
645#
646# This exploits the 'multi-target pattern rule' trick.
647# The syncconfig should be executed only once to make all the targets.
648%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
649	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
650else
651# External modules and some install targets need include/generated/autoconf.h
652# and include/config/auto.conf but do not care if they are up-to-date.
653# Use auto.conf to trigger the test
654PHONY += include/config/auto.conf
655
656include/config/auto.conf:
657	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
658	echo >&2;							\
659	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
660	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
661	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
662	echo >&2 ;							\
663	/bin/false)
664
665endif # may-sync-config
666endif # $(dot-config)
667
668KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
669KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
670KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
671KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
672KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
673KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
674
675ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
676KBUILD_CFLAGS   += -Os
677else
678KBUILD_CFLAGS   += -O2
679endif
680
681# Tell gcc to never replace conditional load with a non-conditional one
682KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
683KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
684
685include scripts/Makefile.kcov
686include scripts/Makefile.gcc-plugins
687
688ifdef CONFIG_READABLE_ASM
689# Disable optimizations that make assembler listings hard to read.
690# reorder blocks reorders the control in the function
691# ipa clone creates specialized cloned functions
692# partial inlining inlines only parts of functions
693KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
694                 $(call cc-option,-fno-ipa-cp-clone,) \
695                 $(call cc-option,-fno-partial-inlining)
696endif
697
698ifneq ($(CONFIG_FRAME_WARN),0)
699KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
700endif
701
702stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
703stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
704stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
705
706KBUILD_CFLAGS += $(stackp-flags-y)
707
708ifeq ($(cc-name),clang)
709KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
710KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
711KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
712# Quiet clang warning: comparison of unsigned expression < 0 is always false
713KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
714# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
715# source of a reference will be _MergedGlobals and not on of the whitelisted names.
716# See modpost pattern 2
717KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
718KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
719else
720
721# These warnings generated too much noise in a regular build.
722# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
723KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
724endif
725
726KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
727ifdef CONFIG_FRAME_POINTER
728KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
729else
730# Some targets (ARM with Thumb2, for example), can't be built with frame
731# pointers.  For those, we don't have FUNCTION_TRACER automatically
732# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
733# incompatible with -fomit-frame-pointer with current GCC, so we don't use
734# -fomit-frame-pointer with FUNCTION_TRACER.
735ifndef CONFIG_FUNCTION_TRACER
736KBUILD_CFLAGS	+= -fomit-frame-pointer
737endif
738endif
739
740KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
741
742ifdef CONFIG_DEBUG_INFO
743ifdef CONFIG_DEBUG_INFO_SPLIT
744KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
745else
746KBUILD_CFLAGS	+= -g
747endif
748KBUILD_AFLAGS	+= -Wa,-gdwarf-2
749endif
750ifdef CONFIG_DEBUG_INFO_DWARF4
751KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
752endif
753
754ifdef CONFIG_DEBUG_INFO_REDUCED
755KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
756		   $(call cc-option,-fno-var-tracking)
757endif
758
759ifdef CONFIG_FUNCTION_TRACER
760ifdef CONFIG_FTRACE_MCOUNT_RECORD
761  # gcc 5 supports generating the mcount tables directly
762  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
763    CC_FLAGS_FTRACE	+= -mrecord-mcount
764    export CC_USING_RECORD_MCOUNT := 1
765  endif
766  ifdef CONFIG_HAVE_NOP_MCOUNT
767    ifeq ($(call cc-option-yn, -mnop-mcount),y)
768      CC_FLAGS_FTRACE	+= -mnop-mcount
769      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
770    endif
771  endif
772endif
773ifdef CONFIG_HAVE_FENTRY
774  ifeq ($(call cc-option-yn, -mfentry),y)
775    CC_FLAGS_FTRACE	+= -mfentry
776    CC_FLAGS_USING	+= -DCC_USING_FENTRY
777  endif
778endif
779export CC_FLAGS_FTRACE
780KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
781KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
782ifdef CONFIG_DYNAMIC_FTRACE
783	ifdef CONFIG_HAVE_C_RECORDMCOUNT
784		BUILD_C_RECORDMCOUNT := y
785		export BUILD_C_RECORDMCOUNT
786	endif
787endif
788endif
789
790# We trigger additional mismatches with less inlining
791ifdef CONFIG_DEBUG_SECTION_MISMATCH
792KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
793endif
794
795ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
796KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
797LDFLAGS_vmlinux += --gc-sections
798endif
799
800# arch Makefile may override CC so keep this after arch Makefile is included
801NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
802
803# warn about C99 declaration after statement
804KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
805
806# disable pointer signed / unsigned warnings in gcc 4.0
807KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
808
809# disable stringop warnings in gcc 8+
810KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
811
812# We'll want to enable this eventually, but it's not going away for 5.7 at least
813KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
814KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
815KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
816
817# Another good warning that we'll want to enable eventually
818KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
819
820# Enabled with W=2, disabled by default as noisy
821KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
822
823# disable invalid "can't wrap" optimizations for signed / pointers
824KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
825
826# clang sets -fmerge-all-constants by default as optimization, but this
827# is non-conforming behavior for C and in fact breaks the kernel, so we
828# need to disable it here generally.
829KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
830
831# for gcc -fno-merge-all-constants disables everything, but it is fine
832# to have actual conforming behavior enabled.
833KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
834
835# Make sure -fstack-check isn't enabled (like gentoo apparently did)
836KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
837
838# conserve stack if available
839KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
840
841# disallow errors like 'EXPORT_GPL(foo);' with missing header
842KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
843
844# require functions to have arguments in prototypes, not empty 'int foo()'
845KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
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# ensure -fcf-protection is disabled when using retpoline as it is
860# incompatible with -mindirect-branch=thunk-extern
861ifdef CONFIG_RETPOLINE
862KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
863endif
864
865# use the deterministic mode of AR if available
866KBUILD_ARFLAGS := $(call ar-option,D)
867
868include scripts/Makefile.kasan
869include scripts/Makefile.extrawarn
870include scripts/Makefile.ubsan
871
872# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
873# last assignments
874KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
875KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
876KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
877
878# Use --build-id when available.
879LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
880KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
881LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
882
883ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
884LDFLAGS_vmlinux	+= $(call ld-option, -X,)
885endif
886
887# insure the checker run with the right endianness
888CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
889
890# the checker needs the correct machine size
891CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
892
893# Default kernel image to build when no specific target is given.
894# KBUILD_IMAGE may be overruled on the command line or
895# set in the environment
896# Also any assignments in arch/$(ARCH)/Makefile take precedence over
897# this default value
898export KBUILD_IMAGE ?= vmlinux
899
900#
901# INSTALL_PATH specifies where to place the updated kernel and system map
902# images. Default is /boot, but you can set it to other values
903export	INSTALL_PATH ?= /boot
904
905#
906# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
907# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
908# an argument if needed. Otherwise it defaults to the kernel install path
909#
910export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
911
912#
913# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
914# relocations required by build roots.  This is not defined in the
915# makefile but the argument can be passed to make if needed.
916#
917
918MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
919export MODLIB
920
921#
922# INSTALL_MOD_STRIP, if defined, will cause modules to be
923# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
924# the default option --strip-debug will be used.  Otherwise,
925# INSTALL_MOD_STRIP value will be used as the options to the strip command.
926
927ifdef INSTALL_MOD_STRIP
928ifeq ($(INSTALL_MOD_STRIP),1)
929mod_strip_cmd = $(STRIP) --strip-debug
930else
931mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
932endif # INSTALL_MOD_STRIP=1
933else
934mod_strip_cmd = true
935endif # INSTALL_MOD_STRIP
936export mod_strip_cmd
937
938# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
939# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
940# or CONFIG_MODULE_COMPRESS_XZ.
941
942mod_compress_cmd = true
943ifdef CONFIG_MODULE_COMPRESS
944  ifdef CONFIG_MODULE_COMPRESS_GZIP
945    mod_compress_cmd = gzip -n -f
946  endif # CONFIG_MODULE_COMPRESS_GZIP
947  ifdef CONFIG_MODULE_COMPRESS_XZ
948    mod_compress_cmd = xz -f
949  endif # CONFIG_MODULE_COMPRESS_XZ
950endif # CONFIG_MODULE_COMPRESS
951export mod_compress_cmd
952
953# Select initial ramdisk compression format, default is gzip(1).
954# This shall be used by the dracut(8) tool while creating an initramfs image.
955#
956INITRD_COMPRESS-y                  := gzip
957INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
958INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
959INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
960INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
961INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
962# do not export INITRD_COMPRESS, since we didn't actually
963# choose a sane default compression above.
964# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
965
966ifdef CONFIG_MODULE_SIG_ALL
967$(eval $(call config_filename,MODULE_SIG_KEY))
968
969mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
970else
971mod_sign_cmd = true
972endif
973export mod_sign_cmd
974
975HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
976
977ifdef CONFIG_STACK_VALIDATION
978  has_libelf := $(call try-run,\
979		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
980  ifeq ($(has_libelf),1)
981    objtool_target := tools/objtool FORCE
982  else
983    SKIP_STACK_VALIDATION := 1
984    export SKIP_STACK_VALIDATION
985  endif
986endif
987
988PHONY += prepare0
989
990ifeq ($(KBUILD_EXTMOD),)
991core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
992
993vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
994		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
995		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
996
997vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
998		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
999
1000init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
1001core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
1002drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
1003net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
1004libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1005libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1006virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
1007
1008# Externally visible symbols (used by link-vmlinux.sh)
1009export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1010export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1011export KBUILD_VMLINUX_LIBS := $(libs-y1)
1012export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1013export LDFLAGS_vmlinux
1014# used by scripts/package/Makefile
1015export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1016
1017vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1018
1019# Recurse until adjust_autoksyms.sh is satisfied
1020PHONY += autoksyms_recursive
1021autoksyms_recursive: $(vmlinux-deps)
1022ifdef CONFIG_TRIM_UNUSED_KSYMS
1023	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1024	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1025endif
1026
1027# For the kernel to actually contain only the needed exported symbols,
1028# we have to build modules as well to determine what those symbols are.
1029# (this can be evaluated only once include/config/auto.conf has been included)
1030ifdef CONFIG_TRIM_UNUSED_KSYMS
1031  KBUILD_MODULES := 1
1032endif
1033
1034autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1035
1036$(autoksyms_h):
1037	$(Q)mkdir -p $(dir $@)
1038	$(Q)touch $@
1039
1040ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1041
1042# Final link of vmlinux with optional arch pass after final link
1043cmd_link-vmlinux =                                                 \
1044	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1045	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1046
1047vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1048ifdef CONFIG_HEADERS_CHECK
1049	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1050endif
1051ifdef CONFIG_GDB_SCRIPTS
1052	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1053endif
1054	+$(call if_changed,link-vmlinux)
1055
1056# Build samples along the rest of the kernel. This needs headers_install.
1057ifdef CONFIG_SAMPLES
1058vmlinux-dirs += samples
1059samples: headers_install
1060endif
1061
1062# The actual objects are generated when descending,
1063# make sure no implicit rule kicks in
1064$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1065
1066# Handle descending into subdirectories listed in $(vmlinux-dirs)
1067# Preset locale variables to speed up the build process. Limit locale
1068# tweaks to this spot to avoid wrong language settings when running
1069# make menuconfig etc.
1070# Error messages still appears in the original language
1071
1072PHONY += $(vmlinux-dirs)
1073$(vmlinux-dirs): prepare scripts
1074	$(Q)$(MAKE) $(build)=$@ need-builtin=1
1075
1076define filechk_kernel.release
1077	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1078endef
1079
1080# Store (new) KERNELRELEASE string in include/config/kernel.release
1081include/config/kernel.release: $(srctree)/Makefile FORCE
1082	$(call filechk,kernel.release)
1083
1084# Additional helpers built in scripts/
1085# Carefully list dependencies so we do not try to build scripts twice
1086# in parallel
1087PHONY += scripts
1088scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1089	$(Q)$(MAKE) $(build)=$(@)
1090
1091# Things we need to do before we recursively start building the kernel
1092# or the modules are listed in "prepare".
1093# A multi level approach is used. prepareN is processed before prepareN-1.
1094# archprepare is used in arch Makefiles and when processed asm symlink,
1095# version.h and scripts_basic is processed / created.
1096
1097PHONY += prepare archprepare prepare1 prepare2 prepare3
1098
1099# prepare3 is used to check if we are building in a separate output directory,
1100# and if so do:
1101# 1) Check that make has not been executed in the kernel src $(srctree)
1102prepare3: include/config/kernel.release
1103ifneq ($(KBUILD_SRC),)
1104	@$(kecho) '  Using $(srctree) as source for kernel'
1105	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1106		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1107		echo >&2 "  in the '$(srctree)' directory.";\
1108		/bin/false; \
1109	fi;
1110endif
1111
1112# prepare2 creates a makefile if using a separate output directory.
1113# From this point forward, .config has been reprocessed, so any rules
1114# that need to depend on updated CONFIG_* values can be checked here.
1115prepare2: prepare3 outputmakefile asm-generic
1116
1117prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1118	$(cmd_crmodverdir)
1119
1120archprepare: archheaders archscripts prepare1 scripts_basic
1121
1122prepare0: archprepare gcc-plugins
1123	$(Q)$(MAKE) $(build)=.
1124
1125# All the preparing..
1126prepare: prepare0 prepare-objtool
1127
1128# Support for using generic headers in asm-generic
1129PHONY += asm-generic uapi-asm-generic
1130asm-generic: uapi-asm-generic
1131	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1132	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
1133uapi-asm-generic:
1134	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1135	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1136
1137PHONY += prepare-objtool
1138prepare-objtool: $(objtool_target)
1139ifeq ($(SKIP_STACK_VALIDATION),1)
1140ifdef CONFIG_UNWINDER_ORC
1141	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1142	@false
1143else
1144	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1145endif
1146endif
1147
1148# Generate some files
1149# ---------------------------------------------------------------------------
1150
1151# KERNELRELEASE can change from a few different places, meaning version.h
1152# needs to be updated, so this check is forced on all builds
1153
1154uts_len := 64
1155define filechk_utsrelease.h
1156	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1157	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1158	  exit 1;                                                         \
1159	fi;                                                               \
1160	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1161endef
1162
1163define filechk_version.h
1164	(echo \#define LINUX_VERSION_CODE $(shell                         \
1165	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1166	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1167endef
1168
1169$(version_h): FORCE
1170	$(call filechk,version.h)
1171	$(Q)rm -f $(old_version_h)
1172
1173include/generated/utsrelease.h: include/config/kernel.release FORCE
1174	$(call filechk,utsrelease.h)
1175
1176PHONY += headerdep
1177headerdep:
1178	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1179	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1180
1181# ---------------------------------------------------------------------------
1182# Kernel headers
1183
1184#Default location for installed headers
1185export INSTALL_HDR_PATH = $(objtree)/usr
1186
1187# If we do an all arch process set dst to include/arch-$(SRCARCH)
1188hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1189
1190PHONY += archheaders
1191archheaders:
1192
1193PHONY += archscripts
1194archscripts:
1195
1196PHONY += __headers
1197__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1198	$(Q)$(MAKE) $(build)=scripts build_unifdef
1199
1200PHONY += headers_install_all
1201headers_install_all:
1202	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1203
1204PHONY += headers_install
1205headers_install: __headers
1206	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1207	  $(error Headers not exportable for the $(SRCARCH) architecture))
1208	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1209	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1210
1211PHONY += headers_check_all
1212headers_check_all: headers_install_all
1213	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1214
1215PHONY += headers_check
1216headers_check: headers_install
1217	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1218	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1219
1220# ---------------------------------------------------------------------------
1221# Kernel selftest
1222
1223PHONY += kselftest
1224kselftest:
1225	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1226
1227PHONY += kselftest-clean
1228kselftest-clean:
1229	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1230
1231PHONY += kselftest-merge
1232kselftest-merge:
1233	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1234	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1235		-m $(objtree)/.config \
1236		$(srctree)/tools/testing/selftests/*/config
1237	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1238
1239# ---------------------------------------------------------------------------
1240# Modules
1241
1242ifdef CONFIG_MODULES
1243
1244# By default, build modules as well
1245
1246all: modules
1247
1248# When we're building modules with modversions, we need to consider
1249# the built-in objects during the descend as well, in order to
1250# make sure the checksums are up to date before we record them.
1251ifdef CONFIG_MODVERSIONS
1252  KBUILD_BUILTIN := 1
1253endif
1254
1255# Build modules
1256#
1257# A module can be listed more than once in obj-m resulting in
1258# duplicate lines in modules.order files.  Those are removed
1259# using awk while concatenating to the final file.
1260
1261PHONY += modules
1262modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1263	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1264	@$(kecho) '  Building modules, stage 2.';
1265	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1266
1267modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1268	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1269
1270%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1271	$(Q)$(MAKE) $(modbuiltin)=$*
1272
1273
1274# Target to prepare building external modules
1275PHONY += modules_prepare
1276modules_prepare: prepare scripts
1277
1278# Target to install modules
1279PHONY += modules_install
1280modules_install: _modinst_ _modinst_post
1281
1282PHONY += _modinst_
1283_modinst_:
1284	@rm -rf $(MODLIB)/kernel
1285	@rm -f $(MODLIB)/source
1286	@mkdir -p $(MODLIB)/kernel
1287	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1288	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1289		rm -f $(MODLIB)/build ; \
1290		ln -s $(CURDIR) $(MODLIB)/build ; \
1291	fi
1292	@cp -f $(objtree)/modules.order $(MODLIB)/
1293	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1294	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1295
1296# This depmod is only for convenience to give the initial
1297# boot a modules.dep even before / is mounted read-write.  However the
1298# boot script depmod is the master version.
1299PHONY += _modinst_post
1300_modinst_post: _modinst_
1301	$(call cmd,depmod)
1302
1303ifeq ($(CONFIG_MODULE_SIG), y)
1304PHONY += modules_sign
1305modules_sign:
1306	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1307endif
1308
1309else # CONFIG_MODULES
1310
1311# Modules not configured
1312# ---------------------------------------------------------------------------
1313
1314PHONY += modules modules_install
1315modules modules_install:
1316	@echo >&2
1317	@echo >&2 "The present kernel configuration has modules disabled."
1318	@echo >&2 "Type 'make config' and enable loadable module support."
1319	@echo >&2 "Then build a kernel with module support enabled."
1320	@echo >&2
1321	@exit 1
1322
1323endif # CONFIG_MODULES
1324
1325###
1326# Cleaning is done on three levels.
1327# make clean     Delete most generated files
1328#                Leave enough to build external modules
1329# make mrproper  Delete the current configuration, and all generated files
1330# make distclean Remove editor backup files, patch leftover files and the like
1331
1332# Directories & files removed with 'make clean'
1333CLEAN_DIRS  += $(MODVERDIR) include/ksym
1334
1335# Directories & files removed with 'make mrproper'
1336MRPROPER_DIRS  += include/config usr/include include/generated          \
1337		  arch/*/include/generated .tmp_objdiff
1338MRPROPER_FILES += .config .config.old .version \
1339		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1340		  signing_key.pem signing_key.priv signing_key.x509	\
1341		  x509.genkey extra_certificates signing_key.x509.keyid	\
1342		  signing_key.x509.signer vmlinux-gdb.py
1343
1344# clean - Delete most, but leave enough to build external modules
1345#
1346clean: rm-dirs  := $(CLEAN_DIRS)
1347clean: rm-files := $(CLEAN_FILES)
1348clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1349
1350PHONY += $(clean-dirs) clean archclean vmlinuxclean
1351$(clean-dirs):
1352	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1353
1354vmlinuxclean:
1355	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1356	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1357
1358clean: archclean vmlinuxclean
1359
1360# mrproper - Delete all generated files, including .config
1361#
1362mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1363mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1364mrproper-dirs      := $(addprefix _mrproper_,scripts)
1365
1366PHONY += $(mrproper-dirs) mrproper archmrproper
1367$(mrproper-dirs):
1368	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1369
1370mrproper: clean archmrproper $(mrproper-dirs)
1371	$(call cmd,rmdirs)
1372	$(call cmd,rmfiles)
1373
1374# distclean
1375#
1376PHONY += distclean
1377
1378distclean: mrproper
1379	@find $(srctree) $(RCS_FIND_IGNORE) \
1380		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1381		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1382		-o -name 'core' \) \
1383		-type f -print | xargs rm -f
1384
1385
1386# Packaging of the kernel to various formats
1387# ---------------------------------------------------------------------------
1388package-dir	:= scripts/package
1389
1390%src-pkg: FORCE
1391	$(Q)$(MAKE) $(build)=$(package-dir) $@
1392%pkg: include/config/kernel.release FORCE
1393	$(Q)$(MAKE) $(build)=$(package-dir) $@
1394
1395
1396# Brief documentation of the typical targets used
1397# ---------------------------------------------------------------------------
1398
1399boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1400boards := $(sort $(notdir $(boards)))
1401board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1402board-dirs := $(sort $(notdir $(board-dirs:/=)))
1403
1404PHONY += help
1405help:
1406	@echo  'Cleaning targets:'
1407	@echo  '  clean		  - Remove most generated files but keep the config and'
1408	@echo  '                    enough build support to build external modules'
1409	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1410	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1411	@echo  ''
1412	@echo  'Configuration targets:'
1413	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1414	@echo  ''
1415	@echo  'Other generic targets:'
1416	@echo  '  all		  - Build all targets marked with [*]'
1417	@echo  '* vmlinux	  - Build the bare kernel'
1418	@echo  '* modules	  - Build all modules'
1419	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1420	@echo  '  dir/            - Build all files in dir and below'
1421	@echo  '  dir/file.[ois]  - Build specified target only'
1422	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1423	@echo  '                    (requires compiler support for LLVM assembly generation)'
1424	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1425	@echo  '                    (requires a recent binutils and recent build (System.map))'
1426	@echo  '  dir/file.ko     - Build module including final link'
1427	@echo  '  modules_prepare - Set up for building external modules'
1428	@echo  '  tags/TAGS	  - Generate tags file for editors'
1429	@echo  '  cscope	  - Generate cscope index'
1430	@echo  '  gtags           - Generate GNU GLOBAL index'
1431	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1432	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1433	@echo  '  image_name	  - Output the image name (use with make -s)'
1434	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1435	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1436	 echo  ''
1437	@echo  'Static analysers:'
1438	@echo  '  checkstack      - Generate a list of stack hogs'
1439	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1440	@echo  '  versioncheck    - Sanity check on version.h usage'
1441	@echo  '  includecheck    - Check for duplicate included header files'
1442	@echo  '  export_report   - List the usages of all exported symbols'
1443	@echo  '  headers_check   - Sanity check on exported headers'
1444	@echo  '  headerdep       - Detect inclusion cycles in headers'
1445	@echo  '  coccicheck      - Check with Coccinelle'
1446	@echo  ''
1447	@echo  'Kernel selftest:'
1448	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1449	@echo  '                    Build, install, and boot kernel before'
1450	@echo  '                    running kselftest on it'
1451	@echo  '  kselftest-clean - Remove all generated kselftest files'
1452	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1453	@echo  '                    .config.'
1454	@echo  ''
1455	@echo 'Userspace tools targets:'
1456	@echo '  use "make tools/help"'
1457	@echo '  or  "cd tools; make help"'
1458	@echo  ''
1459	@echo  'Kernel packaging:'
1460	@$(MAKE) $(build)=$(package-dir) help
1461	@echo  ''
1462	@echo  'Documentation targets:'
1463	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1464	@echo  ''
1465	@echo  'Architecture specific targets ($(SRCARCH)):'
1466	@$(if $(archhelp),$(archhelp),\
1467		echo '  No architecture specific help defined for $(SRCARCH)')
1468	@echo  ''
1469	@$(if $(boards), \
1470		$(foreach b, $(boards), \
1471		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1472		echo '')
1473	@$(if $(board-dirs), \
1474		$(foreach b, $(board-dirs), \
1475		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1476		printf "  %-16s - Show all of the above\\n" help-boards; \
1477		echo '')
1478
1479	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1480	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1481	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1482	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1483	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1484	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1485	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1486	@echo  '		1: warnings which may be relevant and do not occur too often'
1487	@echo  '		2: warnings which occur quite often but may still be relevant'
1488	@echo  '		3: more obscure warnings, can most likely be ignored'
1489	@echo  '		Multiple levels can be combined with W=12 or W=123'
1490	@echo  ''
1491	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1492	@echo  'For further info see the ./README file'
1493
1494
1495help-board-dirs := $(addprefix help-,$(board-dirs))
1496
1497help-boards: $(help-board-dirs)
1498
1499boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1500
1501$(help-board-dirs): help-%:
1502	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1503	@$(if $(boards-per-dir), \
1504		$(foreach b, $(boards-per-dir), \
1505		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1506		echo '')
1507
1508
1509# Documentation targets
1510# ---------------------------------------------------------------------------
1511DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1512	       linkcheckdocs dochelp refcheckdocs
1513PHONY += $(DOC_TARGETS)
1514$(DOC_TARGETS): scripts_basic FORCE
1515	$(Q)$(MAKE) $(build)=Documentation $@
1516
1517else # KBUILD_EXTMOD
1518
1519###
1520# External module support.
1521# When building external modules the kernel used as basis is considered
1522# read-only, and no consistency checks are made and the make
1523# system is not used on the basis kernel. If updates are required
1524# in the basis kernel ordinary make commands (without M=...) must
1525# be used.
1526#
1527# The following are the only valid targets when building external
1528# modules.
1529# make M=dir clean     Delete all automatically generated files
1530# make M=dir modules   Make all modules in specified dir
1531# make M=dir	       Same as 'make M=dir modules'
1532# make M=dir modules_install
1533#                      Install the modules built in the module directory
1534#                      Assumes install directory is already created
1535
1536# We are always building modules
1537KBUILD_MODULES := 1
1538
1539PHONY += $(objtree)/Module.symvers
1540$(objtree)/Module.symvers:
1541	@test -e $(objtree)/Module.symvers || ( \
1542	echo; \
1543	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1544	echo "           is missing; modules will have no dependencies and modversions."; \
1545	echo )
1546
1547module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1548PHONY += $(module-dirs) modules
1549$(module-dirs): prepare $(objtree)/Module.symvers
1550	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1551
1552modules: $(module-dirs)
1553	@$(kecho) '  Building modules, stage 2.';
1554	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1555
1556PHONY += modules_install
1557modules_install: _emodinst_ _emodinst_post
1558
1559install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1560PHONY += _emodinst_
1561_emodinst_:
1562	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1563	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1564
1565PHONY += _emodinst_post
1566_emodinst_post: _emodinst_
1567	$(call cmd,depmod)
1568
1569clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1570
1571PHONY += $(clean-dirs) clean
1572$(clean-dirs):
1573	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1574
1575clean:	rm-dirs := $(MODVERDIR)
1576clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1577
1578PHONY += help
1579help:
1580	@echo  '  Building external modules.'
1581	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1582	@echo  ''
1583	@echo  '  modules         - default target, build the module(s)'
1584	@echo  '  modules_install - install the module'
1585	@echo  '  clean           - remove generated files in module directory only'
1586	@echo  ''
1587
1588# Dummies...
1589PHONY += prepare scripts
1590prepare:
1591	$(cmd_crmodverdir)
1592scripts: ;
1593endif # KBUILD_EXTMOD
1594
1595clean: $(clean-dirs)
1596	$(call cmd,rmdirs)
1597	$(call cmd,rmfiles)
1598	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1599		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1600		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1601		-o -name '*.dwo' -o -name '*.lst' \
1602		-o -name '*.su'  \
1603		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1604		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1605		-o -name '*.asn1.[ch]' \
1606		-o -name '*.symtypes' -o -name 'modules.order' \
1607		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1608		-o -name '*.c.[012]*.*' \
1609		-o -name '*.ll' \
1610		-o -name '*.gcno' \) -type f -print | xargs rm -f
1611
1612# Generate tags for editors
1613# ---------------------------------------------------------------------------
1614quiet_cmd_tags = GEN     $@
1615      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1616
1617tags TAGS cscope gtags: FORCE
1618	$(call cmd,tags)
1619
1620# Scripts to check various things for consistency
1621# ---------------------------------------------------------------------------
1622
1623PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1624
1625includecheck:
1626	find $(srctree)/* $(RCS_FIND_IGNORE) \
1627		-name '*.[hcS]' -type f -print | sort \
1628		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1629
1630versioncheck:
1631	find $(srctree)/* $(RCS_FIND_IGNORE) \
1632		-name '*.[hcS]' -type f -print | sort \
1633		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1634
1635coccicheck:
1636	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1637
1638namespacecheck:
1639	$(PERL) $(srctree)/scripts/namespace.pl
1640
1641export_report:
1642	$(PERL) $(srctree)/scripts/export_report.pl
1643
1644endif #ifeq ($(config-targets),1)
1645endif #ifeq ($(mixed-targets),1)
1646
1647PHONY += checkstack kernelrelease kernelversion image_name
1648
1649# UML needs a little special treatment here.  It wants to use the host
1650# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1651# else wants $(ARCH), including people doing cross-builds, which means
1652# that $(SUBARCH) doesn't work here.
1653ifeq ($(ARCH), um)
1654CHECKSTACK_ARCH := $(SUBARCH)
1655else
1656CHECKSTACK_ARCH := $(ARCH)
1657endif
1658checkstack:
1659	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1660	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1661
1662kernelrelease:
1663	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1664
1665kernelversion:
1666	@echo $(KERNELVERSION)
1667
1668image_name:
1669	@echo $(KBUILD_IMAGE)
1670
1671# Clear a bunch of variables before executing the submake
1672tools/: FORCE
1673	$(Q)mkdir -p $(objtree)/tools
1674	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1675
1676tools/%: FORCE
1677	$(Q)mkdir -p $(objtree)/tools
1678	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1679
1680# Single targets
1681# ---------------------------------------------------------------------------
1682# Single targets are compatible with:
1683# - build with mixed source and output
1684# - build with separate output dir 'make O=...'
1685# - external modules
1686#
1687#  target-dir => where to store outputfile
1688#  build-dir  => directory in kernel source tree to use
1689
1690ifeq ($(KBUILD_EXTMOD),)
1691        build-dir  = $(patsubst %/,%,$(dir $@))
1692        target-dir = $(dir $@)
1693else
1694        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1695        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1696        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1697endif
1698
1699%.s: %.c prepare scripts FORCE
1700	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1701%.i: %.c prepare scripts FORCE
1702	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1703%.o: %.c prepare scripts FORCE
1704	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1705%.lst: %.c prepare scripts FORCE
1706	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1707%.s: %.S prepare scripts FORCE
1708	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1709%.o: %.S prepare scripts FORCE
1710	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1711%.symtypes: %.c prepare scripts FORCE
1712	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1713%.ll: %.c prepare scripts FORCE
1714	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1715
1716# Modules
1717/: prepare scripts FORCE
1718	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1719	$(build)=$(build-dir)
1720# Make sure the latest headers are built for Documentation
1721Documentation/ samples/: headers_install
1722%/: prepare scripts FORCE
1723	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1724	$(build)=$(build-dir)
1725%.ko: prepare scripts FORCE
1726	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1727	$(build)=$(build-dir) $(@:.ko=.o)
1728	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1729
1730# FIXME Should go into a make.lib or something
1731# ===========================================================================
1732
1733quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1734      cmd_rmdirs = rm -rf $(rm-dirs)
1735
1736quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1737      cmd_rmfiles = rm -f $(rm-files)
1738
1739# Run depmod only if we have System.map and depmod is executable
1740quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1741      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1742                   $(KERNELRELEASE)
1743
1744# Create temporary dir for module support files
1745# clean it up only when building all modules
1746cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1747                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1748
1749# read all saved command lines
1750
1751cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1752
1753ifneq ($(cmd_files),)
1754  $(cmd_files): ;	# Do not try to update included dependency files
1755  include $(cmd_files)
1756endif
1757
1758endif	# skip-makefile
1759
1760PHONY += FORCE
1761FORCE:
1762
1763# Declare the contents of the PHONY variable as phony.  We keep that
1764# information in a variable so we can use it in if_changed and friends.
1765.PHONY: $(PHONY)
1766