Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1VERSION = 3
2PATCHLEVEL = 7
3SUBLEVEL = 0
4EXTRAVERSION = -rc1
5NAME = Terrified Chipmunk
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# We are using a recursive build, so we need to do a little thinking
26# to get the ordering right.
27#
28# Most importantly: sub-Makefiles should only ever modify files in
29# their own directory. If in some directory we have a dependency on
30# a file in another dir (which doesn't happen often, but it's often
31# unavoidable when linking the built-in.o targets which finally
32# turn into vmlinux), we will call a sub make in that other dir, and
33# after that we are sure that everything which is in that other dir
34# is now up to date.
35#
36# The only cases where we need to modify files which have global
37# effects are thus separated out and done before the recursive
38# descending is started. They are now explicitly listed as the
39# prepare rule.
40
41# To put more focus on warnings, be less verbose as default
42# Use 'make V=1' to see the full commands
43
44ifeq ("$(origin V)", "command line")
45 KBUILD_VERBOSE = $(V)
46endif
47ifndef KBUILD_VERBOSE
48 KBUILD_VERBOSE = 0
49endif
50
51# Call a source code checker (by default, "sparse") as part of the
52# C compilation.
53#
54# Use 'make C=1' to enable checking of only re-compiled files.
55# Use 'make C=2' to enable checking of *all* source files, regardless
56# of whether they are re-compiled or not.
57#
58# See the file "Documentation/sparse.txt" for more details, including
59# where to get the "sparse" utility.
60
61ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
63endif
64ifndef KBUILD_CHECKSRC
65 KBUILD_CHECKSRC = 0
66endif
67
68# Use make M=dir to specify directory of external module to build
69# Old syntax make ... SUBDIRS=$PWD is still supported
70# Setting the environment variable KBUILD_EXTMOD take precedence
71ifdef SUBDIRS
72 KBUILD_EXTMOD ?= $(SUBDIRS)
73endif
74
75ifeq ("$(origin M)", "command line")
76 KBUILD_EXTMOD := $(M)
77endif
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(KBUILD_SRC),)
98
99# OK, Make called in directory where kernel src resides
100# Do we want to locate output files in a separate directory?
101ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
103endif
104
105ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107endif
108
109# That's our default target when none is given on the command line
110PHONY := _all
111_all:
112
113# Cancel implicit rules on top Makefile
114$(CURDIR)/Makefile Makefile: ;
115
116ifneq ($(KBUILD_OUTPUT),)
117# Invoke a second make in the output directory, passing relevant variables
118# check that the output directory actually exists
119saved-output := $(KBUILD_OUTPUT)
120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121$(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
123
124PHONY += $(MAKECMDGOALS) sub-make
125
126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 $(Q)@:
128
129sub-make: FORCE
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
134
135# Leave processing to above invocation of make
136skip-makefile := 1
137endif # ifneq ($(KBUILD_OUTPUT),)
138endif # ifeq ($(KBUILD_SRC),)
139
140# We process the rest of the Makefile if this is the final invocation of make
141ifeq ($(skip-makefile),)
142
143# If building an external module we do not care about the all: rule
144# but instead _all depend on modules
145PHONY += all
146ifeq ($(KBUILD_EXTMOD),)
147_all: all
148else
149_all: modules
150endif
151
152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153objtree := $(CURDIR)
154src := $(srctree)
155obj := $(objtree)
156
157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export srctree objtree VPATH
160
161
162# SUBARCH tells the usermode build what the underlying arch is. That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below. If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh[234].*/sh/ )
173
174# Cross compiling and selecting different set of gcc/bin-utils
175# ---------------------------------------------------------------------------
176#
177# When performing cross compilation for other architectures ARCH shall be set
178# to the target architecture. (See arch/* for the possibilities).
179# ARCH can be set during invocation of make:
180# make ARCH=ia64
181# Another way is to have ARCH set in the environment.
182# The default ARCH is the host where make is executed.
183
184# CROSS_COMPILE specify the prefix used for all executables used
185# during compilation. Only gcc and related bin-utils executables
186# are prefixed with $(CROSS_COMPILE).
187# CROSS_COMPILE can be set on the command line
188# make CROSS_COMPILE=ia64-linux-
189# Alternatively CROSS_COMPILE can be set in the environment.
190# A third alternative is to store a setting in .config so that plain
191# "make" in the configured kernel build directory always uses that.
192# Default value for CROSS_COMPILE is not to prefix executables
193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194export KBUILD_BUILDHOST := $(SUBARCH)
195ARCH ?= $(SUBARCH)
196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198# Architecture as present in compile.h
199UTS_MACHINE := $(ARCH)
200SRCARCH := $(ARCH)
201
202# Additional ARCH settings for x86
203ifeq ($(ARCH),i386)
204 SRCARCH := x86
205endif
206ifeq ($(ARCH),x86_64)
207 SRCARCH := x86
208endif
209
210# Additional ARCH settings for sparc
211ifeq ($(ARCH),sparc32)
212 SRCARCH := sparc
213endif
214ifeq ($(ARCH),sparc64)
215 SRCARCH := sparc
216endif
217
218# Additional ARCH settings for sh
219ifeq ($(ARCH),sh64)
220 SRCARCH := sh
221endif
222
223# Additional ARCH settings for tile
224ifeq ($(ARCH),tilepro)
225 SRCARCH := tile
226endif
227ifeq ($(ARCH),tilegx)
228 SRCARCH := tile
229endif
230
231# Where to locate arch specific headers
232hdr-arch := $(SRCARCH)
233
234KCONFIG_CONFIG ?= .config
235export KCONFIG_CONFIG
236
237# SHELL used by kbuild
238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
239 else if [ -x /bin/bash ]; then echo /bin/bash; \
240 else echo sh; fi ; fi)
241
242HOSTCC = gcc
243HOSTCXX = g++
244HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
245HOSTCXXFLAGS = -O2
246
247# Decide whether to build built-in, modular, or both.
248# Normally, just do built-in.
249
250KBUILD_MODULES :=
251KBUILD_BUILTIN := 1
252
253# If we have only "make modules", don't compile built-in objects.
254# When we're building modules with modversions, we need to consider
255# the built-in objects during the descend as well, in order to
256# make sure the checksums are up to date before we record them.
257
258ifeq ($(MAKECMDGOALS),modules)
259 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
260endif
261
262# If we have "make <whatever> modules", compile modules
263# in addition to whatever we do anyway.
264# Just "make" or "make all" shall build modules as well
265
266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
267 KBUILD_MODULES := 1
268endif
269
270ifeq ($(MAKECMDGOALS),)
271 KBUILD_MODULES := 1
272endif
273
274export KBUILD_MODULES KBUILD_BUILTIN
275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
276
277# Beautify output
278# ---------------------------------------------------------------------------
279#
280# Normally, we echo the whole command before executing it. By making
281# that echo $($(quiet)$(cmd)), we now have the possibility to set
282# $(quiet) to choose other forms of output instead, e.g.
283#
284# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
285# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
286#
287# If $(quiet) is empty, the whole command will be printed.
288# If it is set to "quiet_", only the short version will be printed.
289# If it is set to "silent_", nothing will be printed at all, since
290# the variable $(silent_cmd_cc_o_c) doesn't exist.
291#
292# A simple variant is to prefix commands with $(Q) - that's useful
293# for commands that shall be hidden in non-verbose mode.
294#
295# $(Q)ln $@ :<
296#
297# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
298# If KBUILD_VERBOSE equals 1 then the above command is displayed.
299
300ifeq ($(KBUILD_VERBOSE),1)
301 quiet =
302 Q =
303else
304 quiet=quiet_
305 Q = @
306endif
307
308# If the user is running make -s (silent mode), suppress echoing of
309# commands
310
311ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
312 quiet=silent_
313endif
314
315export quiet Q KBUILD_VERBOSE
316
317
318# Look for make include files relative to root of kernel src
319MAKEFLAGS += --include-dir=$(srctree)
320
321# We need some generic definitions (do not try to remake the file).
322$(srctree)/scripts/Kbuild.include: ;
323include $(srctree)/scripts/Kbuild.include
324
325# Make variables (CC, etc...)
326
327AS = $(CROSS_COMPILE)as
328LD = $(CROSS_COMPILE)ld
329CC = $(CROSS_COMPILE)gcc
330CPP = $(CC) -E
331AR = $(CROSS_COMPILE)ar
332NM = $(CROSS_COMPILE)nm
333STRIP = $(CROSS_COMPILE)strip
334OBJCOPY = $(CROSS_COMPILE)objcopy
335OBJDUMP = $(CROSS_COMPILE)objdump
336AWK = awk
337GENKSYMS = scripts/genksyms/genksyms
338INSTALLKERNEL := installkernel
339DEPMOD = /sbin/depmod
340PERL = perl
341CHECK = sparse
342
343CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
344 -Wbitwise -Wno-return-void $(CF)
345CFLAGS_MODULE =
346AFLAGS_MODULE =
347LDFLAGS_MODULE =
348CFLAGS_KERNEL =
349AFLAGS_KERNEL =
350CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
351
352
353# Use USERINCLUDE when you must reference the UAPI directories only.
354USERINCLUDE := \
355 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
356 -Iarch/$(hdr-arch)/include/generated/uapi \
357 -I$(srctree)/include/uapi \
358 -Iinclude/generated/uapi \
359 -include $(srctree)/include/linux/kconfig.h
360
361# Use LINUXINCLUDE when you must reference the include/ directory.
362# Needed to be compatible with the O= option
363LINUXINCLUDE := \
364 -I$(srctree)/arch/$(hdr-arch)/include \
365 -Iarch/$(hdr-arch)/include/generated \
366 $(if $(KBUILD_SRC), -I$(srctree)/include) \
367 -Iinclude \
368 $(USERINCLUDE)
369
370KBUILD_CPPFLAGS := -D__KERNEL__
371
372KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
373 -fno-strict-aliasing -fno-common \
374 -Werror-implicit-function-declaration \
375 -Wno-format-security \
376 -fno-delete-null-pointer-checks
377KBUILD_AFLAGS_KERNEL :=
378KBUILD_CFLAGS_KERNEL :=
379KBUILD_AFLAGS := -D__ASSEMBLY__
380KBUILD_AFLAGS_MODULE := -DMODULE
381KBUILD_CFLAGS_MODULE := -DMODULE
382KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
383
384# Read KERNELRELEASE from include/config/kernel.release (if it exists)
385KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
386KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
387
388export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
389export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
390export CPP AR NM STRIP OBJCOPY OBJDUMP
391export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
392export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
393
394export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
395export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
396export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
397export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
398export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
399export KBUILD_ARFLAGS
400
401# When compiling out-of-tree modules, put MODVERDIR in the module
402# tree rather than in the kernel tree. The kernel tree might
403# even be read-only.
404export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
405
406# Files to ignore in find ... statements
407
408RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
409 -o -name .pc -o -name .hg -o -name .git \) -prune -o
410export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
411 --exclude CVS --exclude .pc --exclude .hg --exclude .git
412
413# ===========================================================================
414# Rules shared between *config targets and build targets
415
416# Basic helpers built in scripts/
417PHONY += scripts_basic
418scripts_basic:
419 $(Q)$(MAKE) $(build)=scripts/basic
420 $(Q)rm -f .tmp_quiet_recordmcount
421
422# To avoid any implicit rule to kick in, define an empty command.
423scripts/basic/%: scripts_basic ;
424
425PHONY += outputmakefile
426# outputmakefile generates a Makefile in the output directory, if using a
427# separate output directory. This allows convenient use of make in the
428# output directory.
429outputmakefile:
430ifneq ($(KBUILD_SRC),)
431 $(Q)ln -fsn $(srctree) source
432 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
433 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
434endif
435
436# Support for using generic headers in asm-generic
437PHONY += asm-generic
438asm-generic:
439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
440 obj=arch/$(SRCARCH)/include/generated/asm
441
442# To make sure we do not include .config for any of the *config targets
443# catch them early, and hand them over to scripts/kconfig/Makefile
444# It is allowed to specify more targets when calling make, including
445# mixing *config targets and build targets.
446# For example 'make oldconfig all'.
447# Detect when mixed targets is specified, and make a second invocation
448# of make so .config is not included in this case either (for *config).
449
450version_h := include/generated/uapi/linux/version.h
451
452no-dot-config-targets := clean mrproper distclean \
453 cscope gtags TAGS tags help %docs check% coccicheck \
454 $(version_h) headers_% archheaders archscripts \
455 kernelversion %src-pkg
456
457config-targets := 0
458mixed-targets := 0
459dot-config := 1
460
461ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
462 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
463 dot-config := 0
464 endif
465endif
466
467ifeq ($(KBUILD_EXTMOD),)
468 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
469 config-targets := 1
470 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
471 mixed-targets := 1
472 endif
473 endif
474endif
475
476ifeq ($(mixed-targets),1)
477# ===========================================================================
478# We're called with mixed targets (*config and build targets).
479# Handle them one by one.
480
481%:: FORCE
482 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
483
484else
485ifeq ($(config-targets),1)
486# ===========================================================================
487# *config targets only - make sure prerequisites are updated, and descend
488# in scripts/kconfig to make the *config target
489
490# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
491# KBUILD_DEFCONFIG may point out an alternative default configuration
492# used for 'make defconfig'
493include $(srctree)/arch/$(SRCARCH)/Makefile
494export KBUILD_DEFCONFIG KBUILD_KCONFIG
495
496config: scripts_basic outputmakefile FORCE
497 $(Q)mkdir -p include/linux include/config
498 $(Q)$(MAKE) $(build)=scripts/kconfig $@
499
500%config: scripts_basic outputmakefile FORCE
501 $(Q)mkdir -p include/linux include/config
502 $(Q)$(MAKE) $(build)=scripts/kconfig $@
503
504else
505# ===========================================================================
506# Build targets only - this includes vmlinux, arch specific targets, clean
507# targets and others. In general all targets except *config targets.
508
509ifeq ($(KBUILD_EXTMOD),)
510# Additional helpers built in scripts/
511# Carefully list dependencies so we do not try to build scripts twice
512# in parallel
513PHONY += scripts
514scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
515 $(Q)$(MAKE) $(build)=$(@)
516
517# Objects we will link into vmlinux / subdirs we need to visit
518init-y := init/
519drivers-y := drivers/ sound/ firmware/
520net-y := net/
521libs-y := lib/
522core-y := usr/
523endif # KBUILD_EXTMOD
524
525ifeq ($(dot-config),1)
526# Read in config
527-include include/config/auto.conf
528
529ifeq ($(KBUILD_EXTMOD),)
530# Read in dependencies to all Kconfig* files, make sure to run
531# oldconfig if changes are detected.
532-include include/config/auto.conf.cmd
533
534# To avoid any implicit rule to kick in, define an empty command
535$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
536
537# If .config is newer than include/config/auto.conf, someone tinkered
538# with it and forgot to run make oldconfig.
539# if auto.conf.cmd is missing then we are probably in a cleaned tree so
540# we execute the config step to be sure to catch updated Kconfig files
541include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
542 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
543else
544# external modules needs include/generated/autoconf.h and include/config/auto.conf
545# but do not care if they are up-to-date. Use auto.conf to trigger the test
546PHONY += include/config/auto.conf
547
548include/config/auto.conf:
549 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
550 echo >&2; \
551 echo >&2 " ERROR: Kernel configuration is invalid."; \
552 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
553 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
554 echo >&2 ; \
555 /bin/false)
556
557endif # KBUILD_EXTMOD
558
559else
560# Dummy target needed, because used as prerequisite
561include/config/auto.conf: ;
562endif # $(dot-config)
563
564# The all: target is the default when no target is given on the
565# command line.
566# This allow a user to issue only 'make' to build a kernel including modules
567# Defaults to vmlinux, but the arch makefile usually adds further targets
568all: vmlinux
569
570ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
571KBUILD_CFLAGS += -Os
572else
573KBUILD_CFLAGS += -O2
574endif
575
576include $(srctree)/arch/$(SRCARCH)/Makefile
577
578ifdef CONFIG_READABLE_ASM
579# Disable optimizations that make assembler listings hard to read.
580# reorder blocks reorders the control in the function
581# ipa clone creates specialized cloned functions
582# partial inlining inlines only parts of functions
583KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
584 $(call cc-option,-fno-ipa-cp-clone,) \
585 $(call cc-option,-fno-partial-inlining)
586endif
587
588ifneq ($(CONFIG_FRAME_WARN),0)
589KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
590endif
591
592# Force gcc to behave correct even for buggy distributions
593ifndef CONFIG_CC_STACKPROTECTOR
594KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
595endif
596
597# This warning generated too much noise in a regular build.
598# Use make W=1 to enable this warning (see scripts/Makefile.build)
599KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
600
601ifdef CONFIG_FRAME_POINTER
602KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
603else
604# Some targets (ARM with Thumb2, for example), can't be built with frame
605# pointers. For those, we don't have FUNCTION_TRACER automatically
606# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
607# incompatible with -fomit-frame-pointer with current GCC, so we don't use
608# -fomit-frame-pointer with FUNCTION_TRACER.
609ifndef CONFIG_FUNCTION_TRACER
610KBUILD_CFLAGS += -fomit-frame-pointer
611endif
612endif
613
614ifdef CONFIG_DEBUG_INFO
615KBUILD_CFLAGS += -g
616KBUILD_AFLAGS += -gdwarf-2
617endif
618
619ifdef CONFIG_DEBUG_INFO_REDUCED
620KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
621endif
622
623ifdef CONFIG_FUNCTION_TRACER
624ifdef CONFIG_HAVE_FENTRY
625CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
626endif
627KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
628KBUILD_AFLAGS += $(CC_USING_FENTRY)
629ifdef CONFIG_DYNAMIC_FTRACE
630 ifdef CONFIG_HAVE_C_RECORDMCOUNT
631 BUILD_C_RECORDMCOUNT := y
632 export BUILD_C_RECORDMCOUNT
633 endif
634endif
635endif
636
637# We trigger additional mismatches with less inlining
638ifdef CONFIG_DEBUG_SECTION_MISMATCH
639KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
640endif
641
642# arch Makefile may override CC so keep this after arch Makefile is included
643NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
644CHECKFLAGS += $(NOSTDINC_FLAGS)
645
646# warn about C99 declaration after statement
647KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
648
649# disable pointer signed / unsigned warnings in gcc 4.0
650KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
651
652# disable invalid "can't wrap" optimizations for signed / pointers
653KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
654
655# conserve stack if available
656KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
657
658# use the deterministic mode of AR if available
659KBUILD_ARFLAGS := $(call ar-option,D)
660
661# check for 'asm goto'
662ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
663 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
664endif
665
666# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
667KBUILD_CPPFLAGS += $(KCPPFLAGS)
668KBUILD_AFLAGS += $(KAFLAGS)
669KBUILD_CFLAGS += $(KCFLAGS)
670
671# Use --build-id when available.
672LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
673 $(call cc-ldoption, -Wl$(comma)--build-id,))
674KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
675LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
676
677ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
678LDFLAGS_vmlinux += $(call ld-option, -X,)
679endif
680
681# Default kernel image to build when no specific target is given.
682# KBUILD_IMAGE may be overruled on the command line or
683# set in the environment
684# Also any assignments in arch/$(ARCH)/Makefile take precedence over
685# this default value
686export KBUILD_IMAGE ?= vmlinux
687
688#
689# INSTALL_PATH specifies where to place the updated kernel and system map
690# images. Default is /boot, but you can set it to other values
691export INSTALL_PATH ?= /boot
692
693#
694# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
695# relocations required by build roots. This is not defined in the
696# makefile but the argument can be passed to make if needed.
697#
698
699MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
700export MODLIB
701
702#
703# INSTALL_MOD_STRIP, if defined, will cause modules to be
704# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
705# the default option --strip-debug will be used. Otherwise,
706# INSTALL_MOD_STRIP value will be used as the options to the strip command.
707
708ifdef INSTALL_MOD_STRIP
709ifeq ($(INSTALL_MOD_STRIP),1)
710mod_strip_cmd = $(STRIP) --strip-debug
711else
712mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
713endif # INSTALL_MOD_STRIP=1
714else
715mod_strip_cmd = true
716endif # INSTALL_MOD_STRIP
717export mod_strip_cmd
718
719
720ifeq ($(KBUILD_EXTMOD),)
721core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
722
723vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
724 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
725 $(net-y) $(net-m) $(libs-y) $(libs-m)))
726
727vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
728 $(init-n) $(init-) \
729 $(core-n) $(core-) $(drivers-n) $(drivers-) \
730 $(net-n) $(net-) $(libs-n) $(libs-))))
731
732init-y := $(patsubst %/, %/built-in.o, $(init-y))
733core-y := $(patsubst %/, %/built-in.o, $(core-y))
734drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
735net-y := $(patsubst %/, %/built-in.o, $(net-y))
736libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
737libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
738libs-y := $(libs-y1) $(libs-y2)
739
740# Externally visible symbols (used by link-vmlinux.sh)
741export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
742export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
743export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
744export LDFLAGS_vmlinux
745
746vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
747
748# Final link of vmlinux
749 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
750quiet_cmd_link-vmlinux = LINK $@
751
752# Include targets which we want to
753# execute if the rest of the kernel build went well.
754vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
755ifdef CONFIG_HEADERS_CHECK
756 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
757endif
758ifdef CONFIG_SAMPLES
759 $(Q)$(MAKE) $(build)=samples
760endif
761ifdef CONFIG_BUILD_DOCSRC
762 $(Q)$(MAKE) $(build)=Documentation
763endif
764 +$(call if_changed,link-vmlinux)
765
766# The actual objects are generated when descending,
767# make sure no implicit rule kicks in
768$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
769
770# Handle descending into subdirectories listed in $(vmlinux-dirs)
771# Preset locale variables to speed up the build process. Limit locale
772# tweaks to this spot to avoid wrong language settings when running
773# make menuconfig etc.
774# Error messages still appears in the original language
775
776PHONY += $(vmlinux-dirs)
777$(vmlinux-dirs): prepare scripts
778 $(Q)$(MAKE) $(build)=$@
779
780# Store (new) KERNELRELASE string in include/config/kernel.release
781include/config/kernel.release: include/config/auto.conf FORCE
782 $(Q)rm -f $@
783 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
784
785
786# Things we need to do before we recursively start building the kernel
787# or the modules are listed in "prepare".
788# A multi level approach is used. prepareN is processed before prepareN-1.
789# archprepare is used in arch Makefiles and when processed asm symlink,
790# version.h and scripts_basic is processed / created.
791
792# Listed in dependency order
793PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
794
795# prepare3 is used to check if we are building in a separate output directory,
796# and if so do:
797# 1) Check that make has not been executed in the kernel src $(srctree)
798prepare3: include/config/kernel.release
799ifneq ($(KBUILD_SRC),)
800 @$(kecho) ' Using $(srctree) as source for kernel'
801 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
802 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
803 echo >&2 " in the '$(srctree)' directory.";\
804 /bin/false; \
805 fi;
806endif
807
808# prepare2 creates a makefile if using a separate output directory
809prepare2: prepare3 outputmakefile asm-generic
810
811prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
812 include/config/auto.conf
813 $(cmd_crmodverdir)
814
815archprepare: archheaders archscripts prepare1 scripts_basic
816
817prepare0: archprepare FORCE
818 $(Q)$(MAKE) $(build)=.
819
820# All the preparing..
821prepare: prepare0
822
823# Generate some files
824# ---------------------------------------------------------------------------
825
826# KERNELRELEASE can change from a few different places, meaning version.h
827# needs to be updated, so this check is forced on all builds
828
829uts_len := 64
830define filechk_utsrelease.h
831 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
832 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
833 exit 1; \
834 fi; \
835 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
836endef
837
838define filechk_version.h
839 (echo \#define LINUX_VERSION_CODE $(shell \
840 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
841 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
842endef
843
844$(version_h): $(srctree)/Makefile FORCE
845 $(call filechk,version.h)
846
847include/generated/utsrelease.h: include/config/kernel.release FORCE
848 $(call filechk,utsrelease.h)
849
850PHONY += headerdep
851headerdep:
852 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
853 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
854
855# ---------------------------------------------------------------------------
856
857PHONY += depend dep
858depend dep:
859 @echo '*** Warning: make $@ is unnecessary now.'
860
861# ---------------------------------------------------------------------------
862# Firmware install
863INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
864export INSTALL_FW_PATH
865
866PHONY += firmware_install
867firmware_install: FORCE
868 @mkdir -p $(objtree)/firmware
869 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
870
871# ---------------------------------------------------------------------------
872# Kernel headers
873
874#Default location for installed headers
875export INSTALL_HDR_PATH = $(objtree)/usr
876
877hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
878
879# If we do an all arch process set dst to asm-$(hdr-arch)
880hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
881
882PHONY += archheaders
883archheaders:
884
885PHONY += archscripts
886archscripts:
887
888PHONY += __headers
889__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
890 $(Q)$(MAKE) $(build)=scripts build_unifdef
891
892PHONY += headers_install_all
893headers_install_all:
894 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
895
896PHONY += headers_install
897headers_install: __headers
898 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
899 $(error Headers not exportable for the $(SRCARCH) architecture))
900 $(Q)$(MAKE) $(hdr-inst)=include/uapi
901 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
902
903PHONY += headers_check_all
904headers_check_all: headers_install_all
905 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
906
907PHONY += headers_check
908headers_check: headers_install
909 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
910 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
911
912# ---------------------------------------------------------------------------
913# Modules
914
915ifdef CONFIG_MODULES
916
917# By default, build modules as well
918
919all: modules
920
921# Build modules
922#
923# A module can be listed more than once in obj-m resulting in
924# duplicate lines in modules.order files. Those are removed
925# using awk while concatenating to the final file.
926
927PHONY += modules
928modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
929 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
930 @$(kecho) ' Building modules, stage 2.';
931 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
932 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
933
934modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
935 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
936
937%/modules.builtin: include/config/auto.conf
938 $(Q)$(MAKE) $(modbuiltin)=$*
939
940
941# Target to prepare building external modules
942PHONY += modules_prepare
943modules_prepare: prepare scripts
944
945# Target to install modules
946PHONY += modules_install
947modules_install: _modinst_ _modinst_post
948
949PHONY += _modinst_
950_modinst_:
951 @rm -rf $(MODLIB)/kernel
952 @rm -f $(MODLIB)/source
953 @mkdir -p $(MODLIB)/kernel
954 @ln -s $(srctree) $(MODLIB)/source
955 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
956 rm -f $(MODLIB)/build ; \
957 ln -s $(objtree) $(MODLIB)/build ; \
958 fi
959 @cp -f $(objtree)/modules.order $(MODLIB)/
960 @cp -f $(objtree)/modules.builtin $(MODLIB)/
961 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
962
963# This depmod is only for convenience to give the initial
964# boot a modules.dep even before / is mounted read-write. However the
965# boot script depmod is the master version.
966PHONY += _modinst_post
967_modinst_post: _modinst_
968 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
969 $(call cmd,depmod)
970
971else # CONFIG_MODULES
972
973# Modules not configured
974# ---------------------------------------------------------------------------
975
976modules modules_install: FORCE
977 @echo >&2
978 @echo >&2 "The present kernel configuration has modules disabled."
979 @echo >&2 "Type 'make config' and enable loadable module support."
980 @echo >&2 "Then build a kernel with module support enabled."
981 @echo >&2
982 @exit 1
983
984endif # CONFIG_MODULES
985
986###
987# Cleaning is done on three levels.
988# make clean Delete most generated files
989# Leave enough to build external modules
990# make mrproper Delete the current configuration, and all generated files
991# make distclean Remove editor backup files, patch leftover files and the like
992
993# Directories & files removed with 'make clean'
994CLEAN_DIRS += $(MODVERDIR)
995
996# Directories & files removed with 'make mrproper'
997MRPROPER_DIRS += include/config usr/include include/generated \
998 arch/*/include/generated
999MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1000 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1001 signing_key.priv signing_key.x509 x509.genkey \
1002 extra_certificates signing_key.x509.keyid \
1003 signing_key.x509.signer
1004
1005# clean - Delete most, but leave enough to build external modules
1006#
1007clean: rm-dirs := $(CLEAN_DIRS)
1008clean: rm-files := $(CLEAN_FILES)
1009clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1010
1011PHONY += $(clean-dirs) clean archclean
1012$(clean-dirs):
1013 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1014
1015clean: archclean
1016
1017# mrproper - Delete all generated files, including .config
1018#
1019mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1020mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1021mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1022
1023PHONY += $(mrproper-dirs) mrproper archmrproper
1024$(mrproper-dirs):
1025 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1026
1027mrproper: clean archmrproper $(mrproper-dirs)
1028 $(call cmd,rmdirs)
1029 $(call cmd,rmfiles)
1030
1031# distclean
1032#
1033PHONY += distclean
1034
1035distclean: mrproper
1036 @find $(srctree) $(RCS_FIND_IGNORE) \
1037 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1038 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1039 -o -name '.*.rej' \
1040 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1041 -type f -print | xargs rm -f
1042
1043
1044# Packaging of the kernel to various formats
1045# ---------------------------------------------------------------------------
1046# rpm target kept for backward compatibility
1047package-dir := $(srctree)/scripts/package
1048
1049%src-pkg: FORCE
1050 $(Q)$(MAKE) $(build)=$(package-dir) $@
1051%pkg: include/config/kernel.release FORCE
1052 $(Q)$(MAKE) $(build)=$(package-dir) $@
1053rpm: include/config/kernel.release FORCE
1054 $(Q)$(MAKE) $(build)=$(package-dir) $@
1055
1056
1057# Brief documentation of the typical targets used
1058# ---------------------------------------------------------------------------
1059
1060boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1061boards := $(notdir $(boards))
1062board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1063board-dirs := $(sort $(notdir $(board-dirs:/=)))
1064
1065help:
1066 @echo 'Cleaning targets:'
1067 @echo ' clean - Remove most generated files but keep the config and'
1068 @echo ' enough build support to build external modules'
1069 @echo ' mrproper - Remove all generated files + config + various backup files'
1070 @echo ' distclean - mrproper + remove editor backup and patch files'
1071 @echo ''
1072 @echo 'Configuration targets:'
1073 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1074 @echo ''
1075 @echo 'Other generic targets:'
1076 @echo ' all - Build all targets marked with [*]'
1077 @echo '* vmlinux - Build the bare kernel'
1078 @echo '* modules - Build all modules'
1079 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1080 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1081 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1082 @echo ' dir/ - Build all files in dir and below'
1083 @echo ' dir/file.[oisS] - Build specified target only'
1084 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1085 @echo ' (requires a recent binutils and recent build (System.map))'
1086 @echo ' dir/file.ko - Build module including final link'
1087 @echo ' modules_prepare - Set up for building external modules'
1088 @echo ' tags/TAGS - Generate tags file for editors'
1089 @echo ' cscope - Generate cscope index'
1090 @echo ' gtags - Generate GNU GLOBAL index'
1091 @echo ' kernelrelease - Output the release version string'
1092 @echo ' kernelversion - Output the version stored in Makefile'
1093 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1094 echo ' (default: $(INSTALL_HDR_PATH))'; \
1095 echo ''
1096 @echo 'Static analysers'
1097 @echo ' checkstack - Generate a list of stack hogs'
1098 @echo ' namespacecheck - Name space analysis on compiled kernel'
1099 @echo ' versioncheck - Sanity check on version.h usage'
1100 @echo ' includecheck - Check for duplicate included header files'
1101 @echo ' export_report - List the usages of all exported symbols'
1102 @echo ' headers_check - Sanity check on exported headers'
1103 @echo ' headerdep - Detect inclusion cycles in headers'
1104 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1105 @echo ''
1106 @echo 'Kernel packaging:'
1107 @$(MAKE) $(build)=$(package-dir) help
1108 @echo ''
1109 @echo 'Documentation targets:'
1110 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1111 @echo ''
1112 @echo 'Architecture specific targets ($(SRCARCH)):'
1113 @$(if $(archhelp),$(archhelp),\
1114 echo ' No architecture specific help defined for $(SRCARCH)')
1115 @echo ''
1116 @$(if $(boards), \
1117 $(foreach b, $(boards), \
1118 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1119 echo '')
1120 @$(if $(board-dirs), \
1121 $(foreach b, $(board-dirs), \
1122 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1123 printf " %-16s - Show all of the above\\n" help-boards; \
1124 echo '')
1125
1126 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1127 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1128 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1129 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1130 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1131 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1132 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1133 @echo ' 1: warnings which may be relevant and do not occur too often'
1134 @echo ' 2: warnings which occur quite often but may still be relevant'
1135 @echo ' 3: more obscure warnings, can most likely be ignored'
1136 @echo ' Multiple levels can be combined with W=12 or W=123'
1137 @echo ''
1138 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1139 @echo 'For further info see the ./README file'
1140
1141
1142help-board-dirs := $(addprefix help-,$(board-dirs))
1143
1144help-boards: $(help-board-dirs)
1145
1146boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1147
1148$(help-board-dirs): help-%:
1149 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1150 @$(if $(boards-per-dir), \
1151 $(foreach b, $(boards-per-dir), \
1152 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1153 echo '')
1154
1155
1156# Documentation targets
1157# ---------------------------------------------------------------------------
1158%docs: scripts_basic FORCE
1159 $(Q)$(MAKE) $(build)=scripts build_docproc
1160 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1161
1162else # KBUILD_EXTMOD
1163
1164###
1165# External module support.
1166# When building external modules the kernel used as basis is considered
1167# read-only, and no consistency checks are made and the make
1168# system is not used on the basis kernel. If updates are required
1169# in the basis kernel ordinary make commands (without M=...) must
1170# be used.
1171#
1172# The following are the only valid targets when building external
1173# modules.
1174# make M=dir clean Delete all automatically generated files
1175# make M=dir modules Make all modules in specified dir
1176# make M=dir Same as 'make M=dir modules'
1177# make M=dir modules_install
1178# Install the modules built in the module directory
1179# Assumes install directory is already created
1180
1181# We are always building modules
1182KBUILD_MODULES := 1
1183PHONY += crmodverdir
1184crmodverdir:
1185 $(cmd_crmodverdir)
1186
1187PHONY += $(objtree)/Module.symvers
1188$(objtree)/Module.symvers:
1189 @test -e $(objtree)/Module.symvers || ( \
1190 echo; \
1191 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1192 echo " is missing; modules will have no dependencies and modversions."; \
1193 echo )
1194
1195module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1196PHONY += $(module-dirs) modules
1197$(module-dirs): crmodverdir $(objtree)/Module.symvers
1198 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1199
1200modules: $(module-dirs)
1201 @$(kecho) ' Building modules, stage 2.';
1202 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1203
1204PHONY += modules_install
1205modules_install: _emodinst_ _emodinst_post
1206
1207install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1208PHONY += _emodinst_
1209_emodinst_:
1210 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1211 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1212
1213PHONY += _emodinst_post
1214_emodinst_post: _emodinst_
1215 $(call cmd,depmod)
1216
1217clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1218
1219PHONY += $(clean-dirs) clean
1220$(clean-dirs):
1221 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1222
1223clean: rm-dirs := $(MODVERDIR)
1224clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1225
1226help:
1227 @echo ' Building external modules.'
1228 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1229 @echo ''
1230 @echo ' modules - default target, build the module(s)'
1231 @echo ' modules_install - install the module'
1232 @echo ' clean - remove generated files in module directory only'
1233 @echo ''
1234
1235# Dummies...
1236PHONY += prepare scripts
1237prepare: ;
1238scripts: ;
1239endif # KBUILD_EXTMOD
1240
1241clean: $(clean-dirs)
1242 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1243 $(call cmd,rmdirs)
1244 $(call cmd,rmfiles)
1245 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1246 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1247 -o -name '*.ko.*' \
1248 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1249 -o -name '*.symtypes' -o -name 'modules.order' \
1250 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1251 -o -name '*.gcno' \) -type f -print | xargs rm -f
1252
1253# Generate tags for editors
1254# ---------------------------------------------------------------------------
1255quiet_cmd_tags = GEN $@
1256 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1257
1258tags TAGS cscope gtags: FORCE
1259 $(call cmd,tags)
1260
1261# Scripts to check various things for consistency
1262# ---------------------------------------------------------------------------
1263
1264PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1265
1266includecheck:
1267 find $(srctree)/* $(RCS_FIND_IGNORE) \
1268 -name '*.[hcS]' -type f -print | sort \
1269 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1270
1271versioncheck:
1272 find $(srctree)/* $(RCS_FIND_IGNORE) \
1273 -name '*.[hcS]' -type f -print | sort \
1274 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1275
1276coccicheck:
1277 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1278
1279namespacecheck:
1280 $(PERL) $(srctree)/scripts/namespace.pl
1281
1282export_report:
1283 $(PERL) $(srctree)/scripts/export_report.pl
1284
1285endif #ifeq ($(config-targets),1)
1286endif #ifeq ($(mixed-targets),1)
1287
1288PHONY += checkstack kernelrelease kernelversion
1289
1290# UML needs a little special treatment here. It wants to use the host
1291# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1292# else wants $(ARCH), including people doing cross-builds, which means
1293# that $(SUBARCH) doesn't work here.
1294ifeq ($(ARCH), um)
1295CHECKSTACK_ARCH := $(SUBARCH)
1296else
1297CHECKSTACK_ARCH := $(ARCH)
1298endif
1299checkstack:
1300 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1301 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1302
1303kernelrelease:
1304 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1305
1306kernelversion:
1307 @echo $(KERNELVERSION)
1308
1309# Clear a bunch of variables before executing the submake
1310tools/: FORCE
1311 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1312
1313tools/%: FORCE
1314 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1315
1316# Single targets
1317# ---------------------------------------------------------------------------
1318# Single targets are compatible with:
1319# - build with mixed source and output
1320# - build with separate output dir 'make O=...'
1321# - external modules
1322#
1323# target-dir => where to store outputfile
1324# build-dir => directory in kernel source tree to use
1325
1326ifeq ($(KBUILD_EXTMOD),)
1327 build-dir = $(patsubst %/,%,$(dir $@))
1328 target-dir = $(dir $@)
1329else
1330 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1331 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1332 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1333endif
1334
1335%.s: %.c prepare scripts FORCE
1336 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1337%.i: %.c prepare scripts FORCE
1338 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1339%.o: %.c prepare scripts FORCE
1340 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1341%.lst: %.c prepare scripts FORCE
1342 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1343%.s: %.S prepare scripts FORCE
1344 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1345%.o: %.S prepare scripts FORCE
1346 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1347%.symtypes: %.c prepare scripts FORCE
1348 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1349
1350# Modules
1351/: prepare scripts FORCE
1352 $(cmd_crmodverdir)
1353 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1354 $(build)=$(build-dir)
1355%/: prepare scripts FORCE
1356 $(cmd_crmodverdir)
1357 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1358 $(build)=$(build-dir)
1359%.ko: prepare scripts FORCE
1360 $(cmd_crmodverdir)
1361 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1362 $(build)=$(build-dir) $(@:.ko=.o)
1363 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1364
1365# FIXME Should go into a make.lib or something
1366# ===========================================================================
1367
1368quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1369 cmd_rmdirs = rm -rf $(rm-dirs)
1370
1371quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1372 cmd_rmfiles = rm -f $(rm-files)
1373
1374# Run depmod only if we have System.map and depmod is executable
1375quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1376 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1377 $(KERNELRELEASE)
1378
1379# Create temporary dir for module support files
1380# clean it up only when building all modules
1381cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1382 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1383
1384# read all saved command lines
1385
1386targets := $(wildcard $(sort $(targets)))
1387cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1388
1389ifneq ($(cmd_files),)
1390 $(cmd_files): ; # Do not try to update included dependency files
1391 include $(cmd_files)
1392endif
1393
1394# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1395# Usage:
1396# $(Q)$(MAKE) $(clean)=dir
1397clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1398
1399endif # skip-makefile
1400
1401PHONY += FORCE
1402FORCE:
1403
1404# Declare the contents of the .PHONY variable as phony. We keep that
1405# information in a variable so we can use it in if_changed and friends.
1406.PHONY: $(PHONY)