Root/Makefile

1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 34
4EXTRAVERSION = -rc7
5NAME = Sheep on Meth
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 := $(O)
103endif
104
105# That's our default target when none is given on the command line
106PHONY := _all
107_all:
108
109# Cancel implicit rules on top Makefile
110$(CURDIR)/Makefile Makefile: ;
111
112ifneq ($(KBUILD_OUTPUT),)
113# Invoke a second make in the output directory, passing relevant variables
114# check that the output directory actually exists
115saved-output := $(KBUILD_OUTPUT)
116KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
117$(if $(KBUILD_OUTPUT),, \
118     $(error output directory "$(saved-output)" does not exist))
119
120PHONY += $(MAKECMDGOALS) sub-make
121
122$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
123    $(Q)@:
124
125sub-make: FORCE
126    $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
127    KBUILD_SRC=$(CURDIR) \
128    KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
129    $(filter-out _all sub-make,$(MAKECMDGOALS))
130
131# Leave processing to above invocation of make
132skip-makefile := 1
133endif # ifneq ($(KBUILD_OUTPUT),)
134endif # ifeq ($(KBUILD_SRC),)
135
136# We process the rest of the Makefile if this is the final invocation of make
137ifeq ($(skip-makefile),)
138
139# If building an external module we do not care about the all: rule
140# but instead _all depend on modules
141PHONY += all
142ifeq ($(KBUILD_EXTMOD),)
143_all: all
144else
145_all: modules
146endif
147
148srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
149objtree := $(CURDIR)
150src := $(srctree)
151obj := $(objtree)
152
153VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
154
155export srctree objtree VPATH
156
157
158# SUBARCH tells the usermode build what the underlying arch is. That is set
159# first, and if a usermode build is happening, the "ARCH=um" on the command
160# line overrides the setting of ARCH below. If a native build is happening,
161# then ARCH is assigned, getting whatever value it gets normally, and
162# SUBARCH is subsequently ignored.
163
164SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
165                  -e s/arm.*/arm/ -e s/sa110/arm/ \
166                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
167                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
168                  -e s/sh[234].*/sh/ )
169
170# Cross compiling and selecting different set of gcc/bin-utils
171# ---------------------------------------------------------------------------
172#
173# When performing cross compilation for other architectures ARCH shall be set
174# to the target architecture. (See arch/* for the possibilities).
175# ARCH can be set during invocation of make:
176# make ARCH=ia64
177# Another way is to have ARCH set in the environment.
178# The default ARCH is the host where make is executed.
179
180# CROSS_COMPILE specify the prefix used for all executables used
181# during compilation. Only gcc and related bin-utils executables
182# are prefixed with $(CROSS_COMPILE).
183# CROSS_COMPILE can be set on the command line
184# make CROSS_COMPILE=ia64-linux-
185# Alternatively CROSS_COMPILE can be set in the environment.
186# Default value for CROSS_COMPILE is not to prefix executables
187# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
188export KBUILD_BUILDHOST := $(SUBARCH)
189ARCH ?= $(SUBARCH)
190CROSS_COMPILE ?=
191
192# Architecture as present in compile.h
193UTS_MACHINE := $(ARCH)
194SRCARCH := $(ARCH)
195
196# Additional ARCH settings for x86
197ifeq ($(ARCH),i386)
198        SRCARCH := x86
199endif
200ifeq ($(ARCH),x86_64)
201        SRCARCH := x86
202endif
203
204# Additional ARCH settings for sparc
205ifeq ($(ARCH),sparc64)
206       SRCARCH := sparc
207endif
208
209# Additional ARCH settings for sh
210ifeq ($(ARCH),sh64)
211       SRCARCH := sh
212endif
213
214# Where to locate arch specific headers
215hdr-arch := $(SRCARCH)
216
217ifeq ($(ARCH),m68knommu)
218       hdr-arch := m68k
219endif
220
221KCONFIG_CONFIG ?= .config
222
223# SHELL used by kbuild
224CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
225      else if [ -x /bin/bash ]; then echo /bin/bash; \
226      else echo sh; fi ; fi)
227
228HOSTCC = gcc
229HOSTCXX = g++
230HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
231HOSTCXXFLAGS = -O2
232
233# Decide whether to build built-in, modular, or both.
234# Normally, just do built-in.
235
236KBUILD_MODULES :=
237KBUILD_BUILTIN := 1
238
239# If we have only "make modules", don't compile built-in objects.
240# When we're building modules with modversions, we need to consider
241# the built-in objects during the descend as well, in order to
242# make sure the checksums are up to date before we record them.
243
244ifeq ($(MAKECMDGOALS),modules)
245  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
246endif
247
248# If we have "make <whatever> modules", compile modules
249# in addition to whatever we do anyway.
250# Just "make" or "make all" shall build modules as well
251
252ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
253  KBUILD_MODULES := 1
254endif
255
256ifeq ($(MAKECMDGOALS),)
257  KBUILD_MODULES := 1
258endif
259
260export KBUILD_MODULES KBUILD_BUILTIN
261export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
262
263# Beautify output
264# ---------------------------------------------------------------------------
265#
266# Normally, we echo the whole command before executing it. By making
267# that echo $($(quiet)$(cmd)), we now have the possibility to set
268# $(quiet) to choose other forms of output instead, e.g.
269#
270# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
271# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
272#
273# If $(quiet) is empty, the whole command will be printed.
274# If it is set to "quiet_", only the short version will be printed.
275# If it is set to "silent_", nothing will be printed at all, since
276# the variable $(silent_cmd_cc_o_c) doesn't exist.
277#
278# A simple variant is to prefix commands with $(Q) - that's useful
279# for commands that shall be hidden in non-verbose mode.
280#
281# $(Q)ln $@ :<
282#
283# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
284# If KBUILD_VERBOSE equals 1 then the above command is displayed.
285
286ifeq ($(KBUILD_VERBOSE),1)
287  quiet =
288  Q =
289else
290  quiet=quiet_
291  Q = @
292endif
293
294# If the user is running make -s (silent mode), suppress echoing of
295# commands
296
297ifneq ($(findstring s,$(MAKEFLAGS)),)
298  quiet=silent_
299endif
300
301export quiet Q KBUILD_VERBOSE
302
303
304# Look for make include files relative to root of kernel src
305MAKEFLAGS += --include-dir=$(srctree)
306
307# We need some generic definitions (do not try to remake the file).
308$(srctree)/scripts/Kbuild.include: ;
309include $(srctree)/scripts/Kbuild.include
310
311# Make variables (CC, etc...)
312
313AS = $(CROSS_COMPILE)as
314LD = $(CROSS_COMPILE)ld
315CC = $(CROSS_COMPILE)gcc
316CPP = $(CC) -E
317AR = $(CROSS_COMPILE)ar
318NM = $(CROSS_COMPILE)nm
319STRIP = $(CROSS_COMPILE)strip
320OBJCOPY = $(CROSS_COMPILE)objcopy
321OBJDUMP = $(CROSS_COMPILE)objdump
322AWK = awk
323GENKSYMS = scripts/genksyms/genksyms
324INSTALLKERNEL := installkernel
325DEPMOD = /sbin/depmod
326KALLSYMS = scripts/kallsyms
327PERL = perl
328CHECK = sparse
329
330CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
331          -Wbitwise -Wno-return-void $(CF)
332MODFLAGS = -DMODULE
333CFLAGS_MODULE = $(MODFLAGS)
334AFLAGS_MODULE = $(MODFLAGS)
335LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
336CFLAGS_KERNEL =
337AFLAGS_KERNEL =
338CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
339
340
341# Use LINUXINCLUDE when you must reference the include/ directory.
342# Needed to be compatible with the O= option
343LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
344                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
345                   -include include/generated/autoconf.h
346
347KBUILD_CPPFLAGS := -D__KERNEL__
348
349KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
350           -fno-strict-aliasing -fno-common \
351           -Werror-implicit-function-declaration \
352           -Wno-format-security \
353           -fno-delete-null-pointer-checks
354KBUILD_AFLAGS := -D__ASSEMBLY__
355
356# Read KERNELRELEASE from include/config/kernel.release (if it exists)
357KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
358KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
359
360export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
361export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
362export CPP AR NM STRIP OBJCOPY OBJDUMP
363export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
364export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
365
366export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
367export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
368export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
369
370# When compiling out-of-tree modules, put MODVERDIR in the module
371# tree rather than in the kernel tree. The kernel tree might
372# even be read-only.
373export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
374
375# Files to ignore in find ... statements
376
377RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
378export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
379
380# ===========================================================================
381# Rules shared between *config targets and build targets
382
383# Basic helpers built in scripts/
384PHONY += scripts_basic
385scripts_basic:
386    $(Q)$(MAKE) $(build)=scripts/basic
387    $(Q)rm -f .tmp_quiet_recordmcount
388
389# To avoid any implicit rule to kick in, define an empty command.
390scripts/basic/%: scripts_basic ;
391
392PHONY += outputmakefile
393# outputmakefile generates a Makefile in the output directory, if using a
394# separate output directory. This allows convenient use of make in the
395# output directory.
396outputmakefile:
397ifneq ($(KBUILD_SRC),)
398    $(Q)ln -fsn $(srctree) source
399    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
400        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
401endif
402
403# To make sure we do not include .config for any of the *config targets
404# catch them early, and hand them over to scripts/kconfig/Makefile
405# It is allowed to specify more targets when calling make, including
406# mixing *config targets and build targets.
407# For example 'make oldconfig all'.
408# Detect when mixed targets is specified, and make a second invocation
409# of make so .config is not included in this case either (for *config).
410
411no-dot-config-targets := clean mrproper distclean \
412             cscope TAGS tags help %docs check% \
413             include/linux/version.h headers_% \
414             kernelrelease kernelversion
415
416config-targets := 0
417mixed-targets := 0
418dot-config := 1
419
420ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
421    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
422        dot-config := 0
423    endif
424endif
425
426ifeq ($(KBUILD_EXTMOD),)
427        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
428                config-targets := 1
429                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
430                        mixed-targets := 1
431                endif
432        endif
433endif
434
435ifeq ($(mixed-targets),1)
436# ===========================================================================
437# We're called with mixed targets (*config and build targets).
438# Handle them one by one.
439
440%:: FORCE
441    $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
442
443else
444ifeq ($(config-targets),1)
445# ===========================================================================
446# *config targets only - make sure prerequisites are updated, and descend
447# in scripts/kconfig to make the *config target
448
449# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
450# KBUILD_DEFCONFIG may point out an alternative default configuration
451# used for 'make defconfig'
452include $(srctree)/arch/$(SRCARCH)/Makefile
453export KBUILD_DEFCONFIG KBUILD_KCONFIG
454
455config: scripts_basic outputmakefile FORCE
456    $(Q)mkdir -p include/linux include/config
457    $(Q)$(MAKE) $(build)=scripts/kconfig $@
458
459%config: scripts_basic outputmakefile FORCE
460    $(Q)mkdir -p include/linux include/config
461    $(Q)$(MAKE) $(build)=scripts/kconfig $@
462
463else
464# ===========================================================================
465# Build targets only - this includes vmlinux, arch specific targets, clean
466# targets and others. In general all targets except *config targets.
467
468ifeq ($(KBUILD_EXTMOD),)
469# Additional helpers built in scripts/
470# Carefully list dependencies so we do not try to build scripts twice
471# in parallel
472PHONY += scripts
473scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
474    $(Q)$(MAKE) $(build)=$(@)
475
476# Objects we will link into vmlinux / subdirs we need to visit
477init-y := init/
478drivers-y := drivers/ sound/ firmware/
479net-y := net/
480libs-y := lib/
481core-y := usr/
482endif # KBUILD_EXTMOD
483
484ifeq ($(dot-config),1)
485# Read in config
486-include include/config/auto.conf
487
488ifeq ($(KBUILD_EXTMOD),)
489# Read in dependencies to all Kconfig* files, make sure to run
490# oldconfig if changes are detected.
491-include include/config/auto.conf.cmd
492
493# To avoid any implicit rule to kick in, define an empty command
494$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
495
496# If .config is newer than include/config/auto.conf, someone tinkered
497# with it and forgot to run make oldconfig.
498# if auto.conf.cmd is missing then we are probably in a cleaned tree so
499# we execute the config step to be sure to catch updated Kconfig files
500include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
501    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
502else
503# external modules needs include/generated/autoconf.h and include/config/auto.conf
504# but do not care if they are up-to-date. Use auto.conf to trigger the test
505PHONY += include/config/auto.conf
506
507include/config/auto.conf:
508    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
509    echo; \
510    echo " ERROR: Kernel configuration is invalid."; \
511    echo " include/generated/autoconf.h or $@ are missing.";\
512    echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
513    echo; \
514    /bin/false)
515
516endif # KBUILD_EXTMOD
517
518else
519# Dummy target needed, because used as prerequisite
520include/config/auto.conf: ;
521endif # $(dot-config)
522
523# The all: target is the default when no target is given on the
524# command line.
525# This allow a user to issue only 'make' to build a kernel including modules
526# Defaults vmlinux but it is usually overridden in the arch makefile
527all: vmlinux
528
529ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
530KBUILD_CFLAGS += -Os
531else
532KBUILD_CFLAGS += -O2
533endif
534
535include $(srctree)/arch/$(SRCARCH)/Makefile
536
537ifneq ($(CONFIG_FRAME_WARN),0)
538KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
539endif
540
541# Force gcc to behave correct even for buggy distributions
542ifndef CONFIG_CC_STACKPROTECTOR
543KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
544endif
545
546ifdef CONFIG_FRAME_POINTER
547KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
548else
549KBUILD_CFLAGS += -fomit-frame-pointer
550endif
551
552ifdef CONFIG_DEBUG_INFO
553KBUILD_CFLAGS += -g
554KBUILD_AFLAGS += -gdwarf-2
555endif
556
557ifdef CONFIG_FUNCTION_TRACER
558KBUILD_CFLAGS += -pg
559endif
560
561# We trigger additional mismatches with less inlining
562ifdef CONFIG_DEBUG_SECTION_MISMATCH
563KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
564endif
565
566# arch Makefile may override CC so keep this after arch Makefile is included
567NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
568CHECKFLAGS += $(NOSTDINC_FLAGS)
569
570# warn about C99 declaration after statement
571KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
572
573# disable pointer signed / unsigned warnings in gcc 4.0
574KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
575
576# disable invalid "can't wrap" optimizations for signed / pointers
577KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
578
579# revert to pre-gcc-4.4 behaviour of .eh_frame
580KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
581
582# conserve stack if available
583KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
584
585# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
586# But warn user when we do so
587warn-assign = \
588$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
589
590ifneq ($(KCPPFLAGS),)
591        $(call warn-assign,CPPFLAGS)
592        KBUILD_CPPFLAGS += $(KCPPFLAGS)
593endif
594ifneq ($(KAFLAGS),)
595        $(call warn-assign,AFLAGS)
596        KBUILD_AFLAGS += $(KAFLAGS)
597endif
598ifneq ($(KCFLAGS),)
599        $(call warn-assign,CFLAGS)
600        KBUILD_CFLAGS += $(KCFLAGS)
601endif
602
603# Use --build-id when available.
604LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
605                  $(call cc-ldoption, -Wl$(comma)--build-id,))
606LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
607LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
608
609ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
610LDFLAGS_vmlinux += $(call ld-option, -X,)
611endif
612
613# Default kernel image to build when no specific target is given.
614# KBUILD_IMAGE may be overruled on the command line or
615# set in the environment
616# Also any assignments in arch/$(ARCH)/Makefile take precedence over
617# this default value
618export KBUILD_IMAGE ?= vmlinux
619
620#
621# INSTALL_PATH specifies where to place the updated kernel and system map
622# images. Default is /boot, but you can set it to other values
623export INSTALL_PATH ?= /boot
624
625#
626# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
627# relocations required by build roots. This is not defined in the
628# makefile but the argument can be passed to make if needed.
629#
630
631MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
632export MODLIB
633
634#
635# INSTALL_MOD_STRIP, if defined, will cause modules to be
636# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
637# the default option --strip-debug will be used. Otherwise,
638# INSTALL_MOD_STRIP will used as the options to the strip command.
639
640ifdef INSTALL_MOD_STRIP
641ifeq ($(INSTALL_MOD_STRIP),1)
642mod_strip_cmd = $(STRIP) --strip-debug
643else
644mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
645endif # INSTALL_MOD_STRIP=1
646else
647mod_strip_cmd = true
648endif # INSTALL_MOD_STRIP
649export mod_strip_cmd
650
651
652ifeq ($(KBUILD_EXTMOD),)
653core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
654
655vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
656             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
657             $(net-y) $(net-m) $(libs-y) $(libs-m)))
658
659vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
660             $(init-n) $(init-) \
661             $(core-n) $(core-) $(drivers-n) $(drivers-) \
662             $(net-n) $(net-) $(libs-n) $(libs-))))
663
664init-y := $(patsubst %/, %/built-in.o, $(init-y))
665core-y := $(patsubst %/, %/built-in.o, $(core-y))
666drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
667net-y := $(patsubst %/, %/built-in.o, $(net-y))
668libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
669libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
670libs-y := $(libs-y1) $(libs-y2)
671
672# Build vmlinux
673# ---------------------------------------------------------------------------
674# vmlinux is built from the objects selected by $(vmlinux-init) and
675# $(vmlinux-main). Most are built-in.o files from top-level directories
676# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
677# Ordering when linking is important, and $(vmlinux-init) must be first.
678#
679# vmlinux
680# ^
681# |
682# +-< $(vmlinux-init)
683# | +--< init/version.o + more
684# |
685# +--< $(vmlinux-main)
686# | +--< driver/built-in.o mm/built-in.o + more
687# |
688# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
689#
690# vmlinux version (uname -v) cannot be updated during normal
691# descending-into-subdirs phase since we do not yet know if we need to
692# update vmlinux.
693# Therefore this step is delayed until just before final link of vmlinux -
694# except in the kallsyms case where it is done just before adding the
695# symbols to the kernel.
696#
697# System.map is generated to document addresses of all kernel symbols
698
699vmlinux-init := $(head-y) $(init-y)
700vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
701vmlinux-all := $(vmlinux-init) $(vmlinux-main)
702vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
703export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
704
705# Rule to link vmlinux - also used during CONFIG_KALLSYMS
706# May be overridden by arch/$(ARCH)/Makefile
707quiet_cmd_vmlinux__ ?= LD $@
708      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
709      -T $(vmlinux-lds) $(vmlinux-init) \
710      --start-group $(vmlinux-main) --end-group \
711      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
712
713# Generate new vmlinux version
714quiet_cmd_vmlinux_version = GEN .version
715      cmd_vmlinux_version = set -e; \
716    if [ ! -r .version ]; then \
717      rm -f .version; \
718      echo 1 >.version; \
719    else \
720      mv .version .old_version; \
721      expr 0$$(cat .old_version) + 1 >.version; \
722    fi; \
723    $(MAKE) $(build)=init
724
725# Generate System.map
726quiet_cmd_sysmap = SYSMAP
727      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
728
729# Link of vmlinux
730# If CONFIG_KALLSYMS is set .version is already updated
731# Generate System.map and verify that the content is consistent
732# Use + in front of the vmlinux_version rule to silent warning with make -j2
733# First command is ':' to allow us to use + in front of the rule
734define rule_vmlinux__
735    :
736    $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
737
738    $(call cmd,vmlinux__)
739    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
740
741    $(Q)$(if $($(quiet)cmd_sysmap), \
742      echo ' $($(quiet)cmd_sysmap) System.map' &&) \
743    $(cmd_sysmap) $@ System.map; \
744    if [ $$? -ne 0 ]; then \
745        rm -f $@; \
746        /bin/false; \
747    fi;
748    $(verify_kallsyms)
749endef
750
751
752ifdef CONFIG_KALLSYMS
753# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
754# It's a three stage process:
755# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
756# empty
757# Running kallsyms on that gives us .tmp_kallsyms1.o with
758# the right size - vmlinux version (uname -v) is updated during this step
759# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
760# but due to the added section, some addresses have shifted.
761# From here, we generate a correct .tmp_kallsyms2.o
762# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
763# o Verify that the System.map from vmlinux matches the map from
764# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
765# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
766# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
767# temporary bypass to allow the kernel to be built while the
768# maintainers work out what went wrong with kallsyms.
769
770ifdef CONFIG_KALLSYMS_EXTRA_PASS
771last_kallsyms := 3
772else
773last_kallsyms := 2
774endif
775
776kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
777
778define verify_kallsyms
779    $(Q)$(if $($(quiet)cmd_sysmap), \
780      echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
781      $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
782    $(Q)cmp -s System.map .tmp_System.map || \
783        (echo Inconsistent kallsyms data; \
784         echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
785         rm .tmp_kallsyms* ; /bin/false )
786endef
787
788# Update vmlinux version before link
789# Use + in front of this rule to silent warning about make -j1
790# First command is ':' to allow us to use + in front of this rule
791cmd_ksym_ld = $(cmd_vmlinux__)
792define rule_ksym_ld
793    :
794    +$(call cmd,vmlinux_version)
795    $(call cmd,vmlinux__)
796    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
797endef
798
799# Generate .S file with all kernel symbols
800quiet_cmd_kallsyms = KSYM $@
801      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
802                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
803
804.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
805    $(call if_changed_dep,as_o_S)
806
807.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
808    $(call cmd,kallsyms)
809
810# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
811.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
812    $(call if_changed_rule,ksym_ld)
813
814.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
815    $(call if_changed,vmlinux__)
816
817.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
818    $(call if_changed,vmlinux__)
819
820# Needs to visit scripts/ before $(KALLSYMS) can be used.
821$(KALLSYMS): scripts ;
822
823# Generate some data for debugging strange kallsyms problems
824debug_kallsyms: .tmp_map$(last_kallsyms)
825
826.tmp_map%: .tmp_vmlinux% FORCE
827    ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
828
829.tmp_map3: .tmp_map2
830
831.tmp_map2: .tmp_map1
832
833endif # ifdef CONFIG_KALLSYMS
834
835# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
836# relevant sections renamed as per the linker script.
837quiet_cmd_vmlinux-modpost = LD $@
838      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
839     $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
840     $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
841define rule_vmlinux-modpost
842    :
843    +$(call cmd,vmlinux-modpost)
844    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
845    $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
846endef
847
848# vmlinux image - including updated kernel symbols
849vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
850ifdef CONFIG_HEADERS_CHECK
851    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
852endif
853ifdef CONFIG_SAMPLES
854    $(Q)$(MAKE) $(build)=samples
855endif
856ifdef CONFIG_BUILD_DOCSRC
857    $(Q)$(MAKE) $(build)=Documentation
858endif
859    $(call vmlinux-modpost)
860    $(call if_changed_rule,vmlinux__)
861    $(Q)rm -f .old_version
862
863# build vmlinux.o first to catch section mismatch errors early
864ifdef CONFIG_KALLSYMS
865.tmp_vmlinux1: vmlinux.o
866endif
867
868modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
869vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
870    $(call if_changed_rule,vmlinux-modpost)
871
872# The actual objects are generated when descending,
873# make sure no implicit rule kicks in
874$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
875
876# Handle descending into subdirectories listed in $(vmlinux-dirs)
877# Preset locale variables to speed up the build process. Limit locale
878# tweaks to this spot to avoid wrong language settings when running
879# make menuconfig etc.
880# Error messages still appears in the original language
881
882PHONY += $(vmlinux-dirs)
883$(vmlinux-dirs): prepare scripts
884    $(Q)$(MAKE) $(build)=$@
885ifdef CONFIG_MODULES
886    $(Q)$(MAKE) $(modbuiltin)=$@
887endif
888
889# Build the kernel release string
890#
891# The KERNELRELEASE value built here is stored in the file
892# include/config/kernel.release, and is used when executing several
893# make targets, such as "make install" or "make modules_install."
894#
895# The eventual kernel release string consists of the following fields,
896# shown in a hierarchical format to show how smaller parts are concatenated
897# to form the larger and final value, with values coming from places like
898# the Makefile, kernel config options, make command line options and/or
899# SCM tag information.
900#
901# $(KERNELVERSION)
902# $(VERSION) eg, 2
903# $(PATCHLEVEL) eg, 6
904# $(SUBLEVEL) eg, 18
905# $(EXTRAVERSION) eg, -rc6
906# $(localver-full)
907# $(localver)
908# localversion* (files without backups, containing '~')
909# $(CONFIG_LOCALVERSION) (from kernel config setting)
910# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
911# ./scripts/setlocalversion (SCM tag, if one exists)
912# $(LOCALVERSION) (from make command line if provided)
913#
914# Note how the final $(localver-auto) string is included *only* if the
915# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
916# moment, only git is supported but other SCMs can edit the script
917# scripts/setlocalversion and add the appropriate checks as needed.
918
919pattern = ".*/localversion[^~]*"
920string = $(shell cat /dev/null \
921       `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
922
923localver = $(subst $(space),, $(string) \
924                  $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
925
926# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
927# and if the SCM is know a tag from the SCM is appended.
928# The appended tag is determined by the SCM used.
929#
930# .scmversion is used when generating rpm packages so we do not loose
931# the version information from the SCM when we do the build of the kernel
932# from the copied source
933ifdef CONFIG_LOCALVERSION_AUTO
934
935ifeq ($(wildcard .scmversion),)
936        _localver-auto = $(shell $(CONFIG_SHELL) \
937                         $(srctree)/scripts/setlocalversion $(srctree))
938else
939        _localver-auto = $(shell cat .scmversion 2> /dev/null)
940endif
941
942    localver-auto = $(LOCALVERSION)$(_localver-auto)
943endif
944
945localver-full = $(localver)$(localver-auto)
946
947# Store (new) KERNELRELASE string in include/config/kernel.release
948kernelrelease = $(KERNELVERSION)$(localver-full)
949include/config/kernel.release: include/config/auto.conf FORCE
950    $(Q)rm -f $@
951    $(Q)echo $(kernelrelease) > $@
952
953
954# Things we need to do before we recursively start building the kernel
955# or the modules are listed in "prepare".
956# A multi level approach is used. prepareN is processed before prepareN-1.
957# archprepare is used in arch Makefiles and when processed asm symlink,
958# version.h and scripts_basic is processed / created.
959
960# Listed in dependency order
961PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
962
963# prepare3 is used to check if we are building in a separate output directory,
964# and if so do:
965# 1) Check that make has not been executed in the kernel src $(srctree)
966prepare3: include/config/kernel.release
967ifneq ($(KBUILD_SRC),)
968    @$(kecho) ' Using $(srctree) as source for kernel'
969    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
970        echo " $(srctree) is not clean, please run 'make mrproper'";\
971        echo " in the '$(srctree)' directory.";\
972        /bin/false; \
973    fi;
974endif
975
976# prepare2 creates a makefile if using a separate output directory
977prepare2: prepare3 outputmakefile
978
979prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
980                   include/config/auto.conf
981    $(cmd_crmodverdir)
982
983archprepare: prepare1 scripts_basic
984
985prepare0: archprepare FORCE
986    $(Q)$(MAKE) $(build)=.
987    $(Q)$(MAKE) $(build)=. missing-syscalls
988
989# All the preparing..
990prepare: prepare0
991
992# Generate some files
993# ---------------------------------------------------------------------------
994
995# KERNELRELEASE can change from a few different places, meaning version.h
996# needs to be updated, so this check is forced on all builds
997
998uts_len := 64
999define filechk_utsrelease.h
1000    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1001      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1002      exit 1; \
1003    fi; \
1004    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1005endef
1006
1007define filechk_version.h
1008    (echo \#define LINUX_VERSION_CODE $(shell \
1009    expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1010    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1011endef
1012
1013include/linux/version.h: $(srctree)/Makefile FORCE
1014    $(call filechk,version.h)
1015
1016include/generated/utsrelease.h: include/config/kernel.release FORCE
1017    $(call filechk,utsrelease.h)
1018
1019PHONY += headerdep
1020headerdep:
1021    $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1022
1023# ---------------------------------------------------------------------------
1024
1025PHONY += depend dep
1026depend dep:
1027    @echo '*** Warning: make $@ is unnecessary now.'
1028
1029# ---------------------------------------------------------------------------
1030# Firmware install
1031INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032export INSTALL_FW_PATH
1033
1034PHONY += firmware_install
1035firmware_install: FORCE
1036    @mkdir -p $(objtree)/firmware
1037    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1038
1039# ---------------------------------------------------------------------------
1040# Kernel headers
1041
1042#Default location for installed headers
1043export INSTALL_HDR_PATH = $(objtree)/usr
1044
1045hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1046
1047# If we do an all arch process set dst to asm-$(hdr-arch)
1048hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050PHONY += __headers
1051__headers: include/linux/version.h scripts_basic FORCE
1052    $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061    $(error Headers not exportable for the $(SRCARCH) architecture))
1062    $(Q)$(MAKE) $(hdr-inst)=include
1063    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071    $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Modules
1076
1077ifdef CONFIG_MODULES
1078
1079# By default, build modules as well
1080
1081all: modules
1082
1083# Build modules
1084#
1085# A module can be listed more than once in obj-m resulting in
1086# duplicate lines in modules.order files. Those are removed
1087# using awk while concatenating to the final file.
1088
1089PHONY += modules
1090modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1091    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
1093    @$(kecho) ' Building modules, stage 2.';
1094    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1095    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1096
1097
1098# Target to prepare building external modules
1099PHONY += modules_prepare
1100modules_prepare: prepare scripts
1101
1102# Target to install modules
1103PHONY += modules_install
1104modules_install: _modinst_ _modinst_post
1105
1106PHONY += _modinst_
1107_modinst_:
1108    @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1109        echo "Warning: you may need to install module-init-tools"; \
1110        echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1111        sleep 1; \
1112    fi
1113    @rm -rf $(MODLIB)/kernel
1114    @rm -f $(MODLIB)/source
1115    @mkdir -p $(MODLIB)/kernel
1116    @ln -s $(srctree) $(MODLIB)/source
1117    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1118        rm -f $(MODLIB)/build ; \
1119        ln -s $(objtree) $(MODLIB)/build ; \
1120    fi
1121    @cp -f $(objtree)/modules.order $(MODLIB)/
1122    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1123    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124
1125# This depmod is only for convenience to give the initial
1126# boot a modules.dep even before / is mounted read-write. However the
1127# boot script depmod is the master version.
1128PHONY += _modinst_post
1129_modinst_post: _modinst_
1130    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131    $(call cmd,depmod)
1132
1133else # CONFIG_MODULES
1134
1135# Modules not configured
1136# ---------------------------------------------------------------------------
1137
1138modules modules_install: FORCE
1139    @echo
1140    @echo "The present kernel configuration has modules disabled."
1141    @echo "Type 'make config' and enable loadable module support."
1142    @echo "Then build a kernel with module support enabled."
1143    @echo
1144    @exit 1
1145
1146endif # CONFIG_MODULES
1147
1148###
1149# Cleaning is done on three levels.
1150# make clean Delete most generated files
1151# Leave enough to build external modules
1152# make mrproper Delete the current configuration, and all generated files
1153# make distclean Remove editor backup files, patch leftover files and the like
1154
1155# Directories & files removed with 'make clean'
1156CLEAN_DIRS += $(MODVERDIR)
1157CLEAN_FILES += vmlinux System.map \
1158                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1159
1160# Directories & files removed with 'make mrproper'
1161MRPROPER_DIRS += include/config usr/include include/generated
1162MRPROPER_FILES += .config .config.old .version .old_version \
1163                  include/linux/version.h \
1164          Module.symvers tags TAGS cscope*
1165
1166# clean - Delete most, but leave enough to build external modules
1167#
1168clean: rm-dirs := $(CLEAN_DIRS)
1169clean: rm-files := $(CLEAN_FILES)
1170clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1171
1172PHONY += $(clean-dirs) clean archclean
1173$(clean-dirs):
1174    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1175
1176clean: archclean $(clean-dirs)
1177    $(call cmd,rmdirs)
1178    $(call cmd,rmfiles)
1179    @find . $(RCS_FIND_IGNORE) \
1180        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1181        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1182        -o -name '*.symtypes' -o -name 'modules.order' \
1183        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1184        -o -name '*.gcno' \) -type f -print | xargs rm -f
1185
1186# mrproper - Delete all generated files, including .config
1187#
1188mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1189mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1190mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1191
1192PHONY += $(mrproper-dirs) mrproper archmrproper
1193$(mrproper-dirs):
1194    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1195
1196mrproper: clean archmrproper $(mrproper-dirs)
1197    $(call cmd,rmdirs)
1198    $(call cmd,rmfiles)
1199
1200# distclean
1201#
1202PHONY += distclean
1203
1204distclean: mrproper
1205    @find $(srctree) $(RCS_FIND_IGNORE) \
1206        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1207        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1208        -o -name '.*.rej' -o -size 0 \
1209        -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1210        -type f -print | xargs rm -f
1211
1212
1213# Packaging of the kernel to various formats
1214# ---------------------------------------------------------------------------
1215# rpm target kept for backward compatibility
1216package-dir := $(srctree)/scripts/package
1217
1218%pkg: include/config/kernel.release FORCE
1219    $(Q)$(MAKE) $(build)=$(package-dir) $@
1220rpm: include/config/kernel.release FORCE
1221    $(Q)$(MAKE) $(build)=$(package-dir) $@
1222
1223
1224# Brief documentation of the typical targets used
1225# ---------------------------------------------------------------------------
1226
1227boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1228boards := $(notdir $(boards))
1229board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1230board-dirs := $(sort $(notdir $(board-dirs:/=)))
1231
1232help:
1233    @echo 'Cleaning targets:'
1234    @echo ' clean - Remove most generated files but keep the config and'
1235    @echo ' enough build support to build external modules'
1236    @echo ' mrproper - Remove all generated files + config + various backup files'
1237    @echo ' distclean - mrproper + remove editor backup and patch files'
1238    @echo ''
1239    @echo 'Configuration targets:'
1240    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1241    @echo ''
1242    @echo 'Other generic targets:'
1243    @echo ' all - Build all targets marked with [*]'
1244    @echo '* vmlinux - Build the bare kernel'
1245    @echo '* modules - Build all modules'
1246    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1247    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1248    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1249    @echo ' dir/ - Build all files in dir and below'
1250    @echo ' dir/file.[ois] - Build specified target only'
1251    @echo ' dir/file.ko - Build module including final link'
1252    @echo ' modules_prepare - Set up for building external modules'
1253    @echo ' tags/TAGS - Generate tags file for editors'
1254    @echo ' cscope - Generate cscope index'
1255    @echo ' kernelrelease - Output the release version string'
1256    @echo ' kernelversion - Output the version stored in Makefile'
1257    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1258     echo ' (default: $(INSTALL_HDR_PATH))'; \
1259     echo ''
1260    @echo 'Static analysers'
1261    @echo ' checkstack - Generate a list of stack hogs'
1262    @echo ' namespacecheck - Name space analysis on compiled kernel'
1263    @echo ' versioncheck - Sanity check on version.h usage'
1264    @echo ' includecheck - Check for duplicate included header files'
1265    @echo ' export_report - List the usages of all exported symbols'
1266    @echo ' headers_check - Sanity check on exported headers'
1267    @echo ' headerdep - Detect inclusion cycles in headers'; \
1268     echo ''
1269    @echo 'Kernel packaging:'
1270    @$(MAKE) $(build)=$(package-dir) help
1271    @echo ''
1272    @echo 'Documentation targets:'
1273    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1274    @echo ''
1275    @echo 'Architecture specific targets ($(SRCARCH)):'
1276    @$(if $(archhelp),$(archhelp),\
1277        echo ' No architecture specific help defined for $(SRCARCH)')
1278    @echo ''
1279    @$(if $(boards), \
1280        $(foreach b, $(boards), \
1281        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1282        echo '')
1283    @$(if $(board-dirs), \
1284        $(foreach b, $(board-dirs), \
1285        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1286        printf " %-16s - Show all of the above\\n" help-boards; \
1287        echo '')
1288
1289    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1290    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1291    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1292    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1293    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1294    @echo ''
1295    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1296    @echo 'For further info see the ./README file'
1297
1298
1299help-board-dirs := $(addprefix help-,$(board-dirs))
1300
1301help-boards: $(help-board-dirs)
1302
1303boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1304
1305$(help-board-dirs): help-%:
1306    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1307    @$(if $(boards-per-dir), \
1308        $(foreach b, $(boards-per-dir), \
1309        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1310        echo '')
1311
1312
1313# Documentation targets
1314# ---------------------------------------------------------------------------
1315%docs: scripts_basic FORCE
1316    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1317
1318else # KBUILD_EXTMOD
1319
1320###
1321# External module support.
1322# When building external modules the kernel used as basis is considered
1323# read-only, and no consistency checks are made and the make
1324# system is not used on the basis kernel. If updates are required
1325# in the basis kernel ordinary make commands (without M=...) must
1326# be used.
1327#
1328# The following are the only valid targets when building external
1329# modules.
1330# make M=dir clean Delete all automatically generated files
1331# make M=dir modules Make all modules in specified dir
1332# make M=dir Same as 'make M=dir modules'
1333# make M=dir modules_install
1334# Install the modules built in the module directory
1335# Assumes install directory is already created
1336
1337# We are always building modules
1338KBUILD_MODULES := 1
1339PHONY += crmodverdir
1340crmodverdir:
1341    $(cmd_crmodverdir)
1342
1343PHONY += $(objtree)/Module.symvers
1344$(objtree)/Module.symvers:
1345    @test -e $(objtree)/Module.symvers || ( \
1346    echo; \
1347    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1348    echo " is missing; modules will have no dependencies and modversions."; \
1349    echo )
1350
1351module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1352PHONY += $(module-dirs) modules
1353$(module-dirs): crmodverdir $(objtree)/Module.symvers
1354    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1355
1356modules: $(module-dirs)
1357    @$(kecho) ' Building modules, stage 2.';
1358    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1359
1360PHONY += modules_install
1361modules_install: _emodinst_ _emodinst_post
1362
1363install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1364PHONY += _emodinst_
1365_emodinst_:
1366    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1367    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1368
1369PHONY += _emodinst_post
1370_emodinst_post: _emodinst_
1371    $(call cmd,depmod)
1372
1373clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1374
1375PHONY += $(clean-dirs) clean
1376$(clean-dirs):
1377    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1378
1379clean: rm-dirs := $(MODVERDIR)
1380clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1381                   $(KBUILD_EXTMOD)/modules.order \
1382                   $(KBUILD_EXTMOD)/modules.builtin
1383clean: $(clean-dirs)
1384    $(call cmd,rmdirs)
1385    $(call cmd,rmfiles)
1386    @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1387        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1388        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1389        -o -name '*.gcno' \) -type f -print | xargs rm -f
1390
1391help:
1392    @echo ' Building external modules.'
1393    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1394    @echo ''
1395    @echo ' modules - default target, build the module(s)'
1396    @echo ' modules_install - install the module'
1397    @echo ' clean - remove generated files in module directory only'
1398    @echo ''
1399
1400# Dummies...
1401PHONY += prepare scripts
1402prepare: ;
1403scripts: ;
1404endif # KBUILD_EXTMOD
1405
1406# Generate tags for editors
1407# ---------------------------------------------------------------------------
1408quiet_cmd_tags = GEN $@
1409      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1410
1411tags TAGS cscope: FORCE
1412    $(call cmd,tags)
1413
1414# Scripts to check various things for consistency
1415# ---------------------------------------------------------------------------
1416
1417includecheck:
1418    find * $(RCS_FIND_IGNORE) \
1419        -name '*.[hcS]' -type f -print | sort \
1420        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1421
1422versioncheck:
1423    find * $(RCS_FIND_IGNORE) \
1424        -name '*.[hcS]' -type f -print | sort \
1425        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1426
1427namespacecheck:
1428    $(PERL) $(srctree)/scripts/namespace.pl
1429
1430export_report:
1431    $(PERL) $(srctree)/scripts/export_report.pl
1432
1433endif #ifeq ($(config-targets),1)
1434endif #ifeq ($(mixed-targets),1)
1435
1436PHONY += checkstack kernelrelease kernelversion
1437
1438# UML needs a little special treatment here. It wants to use the host
1439# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1440# else wants $(ARCH), including people doing cross-builds, which means
1441# that $(SUBARCH) doesn't work here.
1442ifeq ($(ARCH), um)
1443CHECKSTACK_ARCH := $(SUBARCH)
1444else
1445CHECKSTACK_ARCH := $(ARCH)
1446endif
1447checkstack:
1448    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1449    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1450
1451kernelrelease:
1452    $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1453    $(error kernelrelease not valid - run 'make prepare' to update it))
1454kernelversion:
1455    @echo $(KERNELVERSION)
1456
1457# Single targets
1458# ---------------------------------------------------------------------------
1459# Single targets are compatible with:
1460# - build with mixed source and output
1461# - build with separate output dir 'make O=...'
1462# - external modules
1463#
1464# target-dir => where to store outputfile
1465# build-dir => directory in kernel source tree to use
1466
1467ifeq ($(KBUILD_EXTMOD),)
1468        build-dir = $(patsubst %/,%,$(dir $@))
1469        target-dir = $(dir $@)
1470else
1471        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1472        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1473        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1474endif
1475
1476%.s: %.c prepare scripts FORCE
1477    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478%.i: %.c prepare scripts FORCE
1479    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480%.o: %.c prepare scripts FORCE
1481    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482%.lst: %.c prepare scripts FORCE
1483    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484%.s: %.S prepare scripts FORCE
1485    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1486%.o: %.S prepare scripts FORCE
1487    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488%.symtypes: %.c prepare scripts FORCE
1489    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1490
1491# Modules
1492/: prepare scripts FORCE
1493    $(cmd_crmodverdir)
1494    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1495    $(build)=$(build-dir)
1496%/: prepare scripts FORCE
1497    $(cmd_crmodverdir)
1498    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1499    $(build)=$(build-dir)
1500%.ko: prepare scripts FORCE
1501    $(cmd_crmodverdir)
1502    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1503    $(build)=$(build-dir) $(@:.ko=.o)
1504    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1505
1506# FIXME Should go into a make.lib or something
1507# ===========================================================================
1508
1509quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1510      cmd_rmdirs = rm -rf $(rm-dirs)
1511
1512quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1513      cmd_rmfiles = rm -f $(rm-files)
1514
1515# Run depmod only if we have System.map and depmod is executable
1516quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1517      cmd_depmod = \
1518    if [ -r System.map -a -x $(DEPMOD) ]; then \
1519        $(DEPMOD) -ae -F System.map \
1520        $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1521        $(KERNELRELEASE); \
1522    fi
1523
1524# Create temporary dir for module support files
1525# clean it up only when building all modules
1526cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1527                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1528
1529a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1530      $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1531      $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1532
1533quiet_cmd_as_o_S = AS $@
1534cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1535
1536# read all saved command lines
1537
1538targets := $(wildcard $(sort $(targets)))
1539cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1540
1541ifneq ($(cmd_files),)
1542  $(cmd_files): ; # Do not try to update included dependency files
1543  include $(cmd_files)
1544endif
1545
1546# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1547# Usage:
1548# $(Q)$(MAKE) $(clean)=dir
1549clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1550
1551endif # skip-makefile
1552
1553PHONY += FORCE
1554FORCE:
1555
1556# Declare the contents of the .PHONY variable as phony. We keep that
1557# information in a variable so we can use it in if_changed and friends.
1558.PHONY: $(PHONY)
1559

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