projects/linux·blob v2.6.35-rc6 · refs

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1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 35
4EXTRAVERSION = -rc6
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# A third alternative is to store a setting in .config so that plain
187# "make" in the configured kernel build directory always uses that.
188# Default value for CROSS_COMPILE is not to prefix executables
189# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
190export KBUILD_BUILDHOST := $(SUBARCH)
191ARCH ?= $(SUBARCH)
192CROSS_COMPILE ?=
193CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
194
195# Architecture as present in compile.h
196UTS_MACHINE := $(ARCH)
197SRCARCH := $(ARCH)
198
199# Additional ARCH settings for x86
200ifeq ($(ARCH),i386)
201 SRCARCH := x86
202endif
203ifeq ($(ARCH),x86_64)
204 SRCARCH := x86
205endif
206
207# Additional ARCH settings for sparc
208ifeq ($(ARCH),sparc64)
209 SRCARCH := sparc
210endif
211
212# Additional ARCH settings for sh
213ifeq ($(ARCH),sh64)
214 SRCARCH := sh
215endif
216
217# Where to locate arch specific headers
218hdr-arch := $(SRCARCH)
219
220ifeq ($(ARCH),m68knommu)
221 hdr-arch := m68k
222endif
223
224KCONFIG_CONFIG ?= .config
225
226# SHELL used by kbuild
227CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
228 else if [ -x /bin/bash ]; then echo /bin/bash; \
229 else echo sh; fi ; fi)
230
231HOSTCC = gcc
232HOSTCXX = g++
233HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
234HOSTCXXFLAGS = -O2
235
236# Decide whether to build built-in, modular, or both.
237# Normally, just do built-in.
238
239KBUILD_MODULES :=
240KBUILD_BUILTIN := 1
241
242# If we have only "make modules", don't compile built-in objects.
243# When we're building modules with modversions, we need to consider
244# the built-in objects during the descend as well, in order to
245# make sure the checksums are up to date before we record them.
246
247ifeq ($(MAKECMDGOALS),modules)
248 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
249endif
250
251# If we have "make <whatever> modules", compile modules
252# in addition to whatever we do anyway.
253# Just "make" or "make all" shall build modules as well
254
255ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
256 KBUILD_MODULES := 1
257endif
258
259ifeq ($(MAKECMDGOALS),)
260 KBUILD_MODULES := 1
261endif
262
263export KBUILD_MODULES KBUILD_BUILTIN
264export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
265
266# Beautify output
267# ---------------------------------------------------------------------------
268#
269# Normally, we echo the whole command before executing it. By making
270# that echo $($(quiet)$(cmd)), we now have the possibility to set
271# $(quiet) to choose other forms of output instead, e.g.
272#
273# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
274# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
275#
276# If $(quiet) is empty, the whole command will be printed.
277# If it is set to "quiet_", only the short version will be printed.
278# If it is set to "silent_", nothing will be printed at all, since
279# the variable $(silent_cmd_cc_o_c) doesn't exist.
280#
281# A simple variant is to prefix commands with $(Q) - that's useful
282# for commands that shall be hidden in non-verbose mode.
283#
284# $(Q)ln $@ :<
285#
286# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
287# If KBUILD_VERBOSE equals 1 then the above command is displayed.
288
289ifeq ($(KBUILD_VERBOSE),1)
290 quiet =
291 Q =
292else
293 quiet=quiet_
294 Q = @
295endif
296
297# If the user is running make -s (silent mode), suppress echoing of
298# commands
299
300ifneq ($(findstring s,$(MAKEFLAGS)),)
301 quiet=silent_
302endif
303
304export quiet Q KBUILD_VERBOSE
305
306
307# Look for make include files relative to root of kernel src
308MAKEFLAGS += --include-dir=$(srctree)
309
310# We need some generic definitions (do not try to remake the file).
311$(srctree)/scripts/Kbuild.include: ;
312include $(srctree)/scripts/Kbuild.include
313
314# Make variables (CC, etc...)
315
316AS = $(CROSS_COMPILE)as
317LD = $(CROSS_COMPILE)ld
318CC = $(CROSS_COMPILE)gcc
319CPP = $(CC) -E
320AR = $(CROSS_COMPILE)ar
321NM = $(CROSS_COMPILE)nm
322STRIP = $(CROSS_COMPILE)strip
323OBJCOPY = $(CROSS_COMPILE)objcopy
324OBJDUMP = $(CROSS_COMPILE)objdump
325AWK = awk
326GENKSYMS = scripts/genksyms/genksyms
327INSTALLKERNEL := installkernel
328DEPMOD = /sbin/depmod
329KALLSYMS = scripts/kallsyms
330PERL = perl
331CHECK = sparse
332
333CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
334 -Wbitwise -Wno-return-void $(CF)
335MODFLAGS = -DMODULE
336CFLAGS_MODULE = $(MODFLAGS)
337AFLAGS_MODULE = $(MODFLAGS)
338LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
339CFLAGS_KERNEL =
340AFLAGS_KERNEL =
341CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
342
343
344# Use LINUXINCLUDE when you must reference the include/ directory.
345# Needed to be compatible with the O= option
346LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
347 $(if $(KBUILD_SRC), -I$(srctree)/include) \
348 -include include/generated/autoconf.h
349
350KBUILD_CPPFLAGS := -D__KERNEL__
351
352KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
353 -fno-strict-aliasing -fno-common \
354 -Werror-implicit-function-declaration \
355 -Wno-format-security \
356 -fno-delete-null-pointer-checks
357KBUILD_AFLAGS := -D__ASSEMBLY__
358
359# Read KERNELRELEASE from include/config/kernel.release (if it exists)
360KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
361KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
362
363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
364export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
365export CPP AR NM STRIP OBJCOPY OBJDUMP
366export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
367export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
368
369export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
370export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
371export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
372
373# When compiling out-of-tree modules, put MODVERDIR in the module
374# tree rather than in the kernel tree. The kernel tree might
375# even be read-only.
376export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
377
378# Files to ignore in find ... statements
379
380RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
381export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
382
383# ===========================================================================
384# Rules shared between *config targets and build targets
385
386# Basic helpers built in scripts/
387PHONY += scripts_basic
388scripts_basic:
389 $(Q)$(MAKE) $(build)=scripts/basic
390 $(Q)rm -f .tmp_quiet_recordmcount
391
392# To avoid any implicit rule to kick in, define an empty command.
393scripts/basic/%: scripts_basic ;
394
395PHONY += outputmakefile
396# outputmakefile generates a Makefile in the output directory, if using a
397# separate output directory. This allows convenient use of make in the
398# output directory.
399outputmakefile:
400ifneq ($(KBUILD_SRC),)
401 $(Q)ln -fsn $(srctree) source
402 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
403 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
404endif
405
406# To make sure we do not include .config for any of the *config targets
407# catch them early, and hand them over to scripts/kconfig/Makefile
408# It is allowed to specify more targets when calling make, including
409# mixing *config targets and build targets.
410# For example 'make oldconfig all'.
411# Detect when mixed targets is specified, and make a second invocation
412# of make so .config is not included in this case either (for *config).
413
414no-dot-config-targets := clean mrproper distclean \
415 cscope TAGS tags help %docs check% \
416 include/linux/version.h headers_% \
417 kernelrelease kernelversion
418
419config-targets := 0
420mixed-targets := 0
421dot-config := 1
422
423ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
424 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
425 dot-config := 0
426 endif
427endif
428
429ifeq ($(KBUILD_EXTMOD),)
430 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
431 config-targets := 1
432 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
433 mixed-targets := 1
434 endif
435 endif
436endif
437
438ifeq ($(mixed-targets),1)
439# ===========================================================================
440# We're called with mixed targets (*config and build targets).
441# Handle them one by one.
442
443%:: FORCE
444 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
445
446else
447ifeq ($(config-targets),1)
448# ===========================================================================
449# *config targets only - make sure prerequisites are updated, and descend
450# in scripts/kconfig to make the *config target
451
452# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
453# KBUILD_DEFCONFIG may point out an alternative default configuration
454# used for 'make defconfig'
455include $(srctree)/arch/$(SRCARCH)/Makefile
456export KBUILD_DEFCONFIG KBUILD_KCONFIG
457
458config: scripts_basic outputmakefile FORCE
459 $(Q)mkdir -p include/linux include/config
460 $(Q)$(MAKE) $(build)=scripts/kconfig $@
461
462%config: scripts_basic outputmakefile FORCE
463 $(Q)mkdir -p include/linux include/config
464 $(Q)$(MAKE) $(build)=scripts/kconfig $@
465
466else
467# ===========================================================================
468# Build targets only - this includes vmlinux, arch specific targets, clean
469# targets and others. In general all targets except *config targets.
470
471ifeq ($(KBUILD_EXTMOD),)
472# Additional helpers built in scripts/
473# Carefully list dependencies so we do not try to build scripts twice
474# in parallel
475PHONY += scripts
476scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
477 $(Q)$(MAKE) $(build)=$(@)
478
479# Objects we will link into vmlinux / subdirs we need to visit
480init-y := init/
481drivers-y := drivers/ sound/ firmware/
482net-y := net/
483libs-y := lib/
484core-y := usr/
485endif # KBUILD_EXTMOD
486
487ifeq ($(dot-config),1)
488# Read in config
489-include include/config/auto.conf
490
491ifeq ($(KBUILD_EXTMOD),)
492# Read in dependencies to all Kconfig* files, make sure to run
493# oldconfig if changes are detected.
494-include include/config/auto.conf.cmd
495
496# To avoid any implicit rule to kick in, define an empty command
497$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
498
499# If .config is newer than include/config/auto.conf, someone tinkered
500# with it and forgot to run make oldconfig.
501# if auto.conf.cmd is missing then we are probably in a cleaned tree so
502# we execute the config step to be sure to catch updated Kconfig files
503include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
504 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
505else
506# external modules needs include/generated/autoconf.h and include/config/auto.conf
507# but do not care if they are up-to-date. Use auto.conf to trigger the test
508PHONY += include/config/auto.conf
509
510include/config/auto.conf:
511 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
512 echo; \
513 echo " ERROR: Kernel configuration is invalid."; \
514 echo " include/generated/autoconf.h or $@ are missing.";\
515 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
516 echo; \
517 /bin/false)
518
519endif # KBUILD_EXTMOD
520
521else
522# Dummy target needed, because used as prerequisite
523include/config/auto.conf: ;
524endif # $(dot-config)
525
526# The all: target is the default when no target is given on the
527# command line.
528# This allow a user to issue only 'make' to build a kernel including modules
529# Defaults vmlinux but it is usually overridden in the arch makefile
530all: vmlinux
531
532ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
533KBUILD_CFLAGS += -Os
534else
535KBUILD_CFLAGS += -O2
536endif
537
538include $(srctree)/arch/$(SRCARCH)/Makefile
539
540ifneq ($(CONFIG_FRAME_WARN),0)
541KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
542endif
543
544# Force gcc to behave correct even for buggy distributions
545ifndef CONFIG_CC_STACKPROTECTOR
546KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
547endif
548
549ifdef CONFIG_FRAME_POINTER
550KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
551else
552KBUILD_CFLAGS += -fomit-frame-pointer
553endif
554
555ifdef CONFIG_DEBUG_INFO
556KBUILD_CFLAGS += -g
557KBUILD_AFLAGS += -gdwarf-2
558endif
559
560ifdef CONFIG_FUNCTION_TRACER
561KBUILD_CFLAGS += -pg
562endif
563
564# We trigger additional mismatches with less inlining
565ifdef CONFIG_DEBUG_SECTION_MISMATCH
566KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
567endif
568
569# arch Makefile may override CC so keep this after arch Makefile is included
570NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
571CHECKFLAGS += $(NOSTDINC_FLAGS)
572
573# warn about C99 declaration after statement
574KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
575
576# disable pointer signed / unsigned warnings in gcc 4.0
577KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
578
579# disable invalid "can't wrap" optimizations for signed / pointers
580KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
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) $(build)=$@
885
886# Store (new) KERNELRELASE string in include/config/kernel.release
887include/config/kernel.release: include/config/auto.conf FORCE
888 $(Q)rm -f $@
889 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
890
891
892# Things we need to do before we recursively start building the kernel
893# or the modules are listed in "prepare".
894# A multi level approach is used. prepareN is processed before prepareN-1.
895# archprepare is used in arch Makefiles and when processed asm symlink,
896# version.h and scripts_basic is processed / created.
897
898# Listed in dependency order
899PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
900
901# prepare3 is used to check if we are building in a separate output directory,
902# and if so do:
903# 1) Check that make has not been executed in the kernel src $(srctree)
904prepare3: include/config/kernel.release
905ifneq ($(KBUILD_SRC),)
906 @$(kecho) ' Using $(srctree) as source for kernel'
907 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
908 echo " $(srctree) is not clean, please run 'make mrproper'";\
909 echo " in the '$(srctree)' directory.";\
910 /bin/false; \
911 fi;
912endif
913
914# prepare2 creates a makefile if using a separate output directory
915prepare2: prepare3 outputmakefile
916
917prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
918 include/config/auto.conf
919 $(cmd_crmodverdir)
920
921archprepare: prepare1 scripts_basic
922
923prepare0: archprepare FORCE
924 $(Q)$(MAKE) $(build)=.
925 $(Q)$(MAKE) $(build)=. missing-syscalls
926
927# All the preparing..
928prepare: prepare0
929
930# Generate some files
931# ---------------------------------------------------------------------------
932
933# KERNELRELEASE can change from a few different places, meaning version.h
934# needs to be updated, so this check is forced on all builds
935
936uts_len := 64
937define filechk_utsrelease.h
938 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
939 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
940 exit 1; \
941 fi; \
942 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
943endef
944
945define filechk_version.h
946 (echo \#define LINUX_VERSION_CODE $(shell \
947 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
948 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
949endef
950
951include/linux/version.h: $(srctree)/Makefile FORCE
952 $(call filechk,version.h)
953
954include/generated/utsrelease.h: include/config/kernel.release FORCE
955 $(call filechk,utsrelease.h)
956
957PHONY += headerdep
958headerdep:
959 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
960
961# ---------------------------------------------------------------------------
962
963PHONY += depend dep
964depend dep:
965 @echo '*** Warning: make $@ is unnecessary now.'
966
967# ---------------------------------------------------------------------------
968# Firmware install
969INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
970export INSTALL_FW_PATH
971
972PHONY += firmware_install
973firmware_install: FORCE
974 @mkdir -p $(objtree)/firmware
975 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
976
977# ---------------------------------------------------------------------------
978# Kernel headers
979
980#Default location for installed headers
981export INSTALL_HDR_PATH = $(objtree)/usr
982
983hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
984
985# If we do an all arch process set dst to asm-$(hdr-arch)
986hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
987
988PHONY += __headers
989__headers: include/linux/version.h scripts_basic FORCE
990 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
991
992PHONY += headers_install_all
993headers_install_all:
994 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
995
996PHONY += headers_install
997headers_install: __headers
998 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
999 $(error Headers not exportable for the $(SRCARCH) architecture))
1000 $(Q)$(MAKE) $(hdr-inst)=include
1001 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1002
1003PHONY += headers_check_all
1004headers_check_all: headers_install_all
1005 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1006
1007PHONY += headers_check
1008headers_check: headers_install
1009 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1010 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1011
1012# ---------------------------------------------------------------------------
1013# Modules
1014
1015ifdef CONFIG_MODULES
1016
1017# By default, build modules as well
1018
1019all: modules
1020
1021# Build modules
1022#
1023# A module can be listed more than once in obj-m resulting in
1024# duplicate lines in modules.order files. Those are removed
1025# using awk while concatenating to the final file.
1026
1027PHONY += modules
1028modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1029 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1030 @$(kecho) ' Building modules, stage 2.';
1031 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1032 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1033
1034modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1035 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1036
1037%/modules.builtin: include/config/auto.conf
1038 $(Q)$(MAKE) $(modbuiltin)=$*
1039
1040
1041# Target to prepare building external modules
1042PHONY += modules_prepare
1043modules_prepare: prepare scripts
1044
1045# Target to install modules
1046PHONY += modules_install
1047modules_install: _modinst_ _modinst_post
1048
1049PHONY += _modinst_
1050_modinst_:
1051 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1052 echo "Warning: you may need to install module-init-tools"; \
1053 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1054 sleep 1; \
1055 fi
1056 @rm -rf $(MODLIB)/kernel
1057 @rm -f $(MODLIB)/source
1058 @mkdir -p $(MODLIB)/kernel
1059 @ln -s $(srctree) $(MODLIB)/source
1060 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1061 rm -f $(MODLIB)/build ; \
1062 ln -s $(objtree) $(MODLIB)/build ; \
1063 fi
1064 @cp -f $(objtree)/modules.order $(MODLIB)/
1065 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1066 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1067
1068# This depmod is only for convenience to give the initial
1069# boot a modules.dep even before / is mounted read-write. However the
1070# boot script depmod is the master version.
1071PHONY += _modinst_post
1072_modinst_post: _modinst_
1073 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1074 $(call cmd,depmod)
1075
1076else # CONFIG_MODULES
1077
1078# Modules not configured
1079# ---------------------------------------------------------------------------
1080
1081modules modules_install: FORCE
1082 @echo
1083 @echo "The present kernel configuration has modules disabled."
1084 @echo "Type 'make config' and enable loadable module support."
1085 @echo "Then build a kernel with module support enabled."
1086 @echo
1087 @exit 1
1088
1089endif # CONFIG_MODULES
1090
1091###
1092# Cleaning is done on three levels.
1093# make clean Delete most generated files
1094# Leave enough to build external modules
1095# make mrproper Delete the current configuration, and all generated files
1096# make distclean Remove editor backup files, patch leftover files and the like
1097
1098# Directories & files removed with 'make clean'
1099CLEAN_DIRS += $(MODVERDIR)
1100CLEAN_FILES += vmlinux System.map \
1101 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1102
1103# Directories & files removed with 'make mrproper'
1104MRPROPER_DIRS += include/config usr/include include/generated
1105MRPROPER_FILES += .config .config.old .version .old_version \
1106 include/linux/version.h \
1107 Module.symvers tags TAGS cscope*
1108
1109# clean - Delete most, but leave enough to build external modules
1110#
1111clean: rm-dirs := $(CLEAN_DIRS)
1112clean: rm-files := $(CLEAN_FILES)
1113clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1114
1115PHONY += $(clean-dirs) clean archclean
1116$(clean-dirs):
1117 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1118
1119clean: archclean $(clean-dirs)
1120 $(call cmd,rmdirs)
1121 $(call cmd,rmfiles)
1122 @find . $(RCS_FIND_IGNORE) \
1123 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1124 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1125 -o -name '*.symtypes' -o -name 'modules.order' \
1126 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1127 -o -name '*.gcno' \) -type f -print | xargs rm -f
1128
1129# mrproper - Delete all generated files, including .config
1130#
1131mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1132mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1133mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1134
1135PHONY += $(mrproper-dirs) mrproper archmrproper
1136$(mrproper-dirs):
1137 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1138
1139mrproper: clean archmrproper $(mrproper-dirs)
1140 $(call cmd,rmdirs)
1141 $(call cmd,rmfiles)
1142
1143# distclean
1144#
1145PHONY += distclean
1146
1147distclean: mrproper
1148 @find $(srctree) $(RCS_FIND_IGNORE) \
1149 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1150 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1151 -o -name '.*.rej' -o -size 0 \
1152 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1153 -type f -print | xargs rm -f
1154
1155
1156# Packaging of the kernel to various formats
1157# ---------------------------------------------------------------------------
1158# rpm target kept for backward compatibility
1159package-dir := $(srctree)/scripts/package
1160
1161%pkg: include/config/kernel.release FORCE
1162 $(Q)$(MAKE) $(build)=$(package-dir) $@
1163rpm: include/config/kernel.release FORCE
1164 $(Q)$(MAKE) $(build)=$(package-dir) $@
1165
1166
1167# Brief documentation of the typical targets used
1168# ---------------------------------------------------------------------------
1169
1170boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1171boards := $(notdir $(boards))
1172board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1173board-dirs := $(sort $(notdir $(board-dirs:/=)))
1174
1175help:
1176 @echo 'Cleaning targets:'
1177 @echo ' clean - Remove most generated files but keep the config and'
1178 @echo ' enough build support to build external modules'
1179 @echo ' mrproper - Remove all generated files + config + various backup files'
1180 @echo ' distclean - mrproper + remove editor backup and patch files'
1181 @echo ''
1182 @echo 'Configuration targets:'
1183 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1184 @echo ''
1185 @echo 'Other generic targets:'
1186 @echo ' all - Build all targets marked with [*]'
1187 @echo '* vmlinux - Build the bare kernel'
1188 @echo '* modules - Build all modules'
1189 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1190 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1191 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1192 @echo ' dir/ - Build all files in dir and below'
1193 @echo ' dir/file.[oisS] - Build specified target only'
1194 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1195 @echo ' (requires a recent binutils and recent build (System.map))'
1196 @echo ' dir/file.ko - Build module including final link'
1197 @echo ' modules_prepare - Set up for building external modules'
1198 @echo ' tags/TAGS - Generate tags file for editors'
1199 @echo ' cscope - Generate cscope index'
1200 @echo ' kernelrelease - Output the release version string'
1201 @echo ' kernelversion - Output the version stored in Makefile'
1202 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1203 echo ' (default: $(INSTALL_HDR_PATH))'; \
1204 echo ''
1205 @echo 'Static analysers'
1206 @echo ' checkstack - Generate a list of stack hogs'
1207 @echo ' namespacecheck - Name space analysis on compiled kernel'
1208 @echo ' versioncheck - Sanity check on version.h usage'
1209 @echo ' includecheck - Check for duplicate included header files'
1210 @echo ' export_report - List the usages of all exported symbols'
1211 @echo ' headers_check - Sanity check on exported headers'
1212 @echo ' headerdep - Detect inclusion cycles in headers'; \
1213 echo ''
1214 @echo 'Kernel packaging:'
1215 @$(MAKE) $(build)=$(package-dir) help
1216 @echo ''
1217 @echo 'Documentation targets:'
1218 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1219 @echo ''
1220 @echo 'Architecture specific targets ($(SRCARCH)):'
1221 @$(if $(archhelp),$(archhelp),\
1222 echo ' No architecture specific help defined for $(SRCARCH)')
1223 @echo ''
1224 @$(if $(boards), \
1225 $(foreach b, $(boards), \
1226 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1227 echo '')
1228 @$(if $(board-dirs), \
1229 $(foreach b, $(board-dirs), \
1230 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1231 printf " %-16s - Show all of the above\\n" help-boards; \
1232 echo '')
1233
1234 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1235 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1236 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1237 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1238 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1239 @echo ''
1240 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1241 @echo 'For further info see the ./README file'
1242
1243
1244help-board-dirs := $(addprefix help-,$(board-dirs))
1245
1246help-boards: $(help-board-dirs)
1247
1248boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1249
1250$(help-board-dirs): help-%:
1251 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1252 @$(if $(boards-per-dir), \
1253 $(foreach b, $(boards-per-dir), \
1254 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1255 echo '')
1256
1257
1258# Documentation targets
1259# ---------------------------------------------------------------------------
1260%docs: scripts_basic FORCE
1261 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1262
1263else # KBUILD_EXTMOD
1264
1265###
1266# External module support.
1267# When building external modules the kernel used as basis is considered
1268# read-only, and no consistency checks are made and the make
1269# system is not used on the basis kernel. If updates are required
1270# in the basis kernel ordinary make commands (without M=...) must
1271# be used.
1272#
1273# The following are the only valid targets when building external
1274# modules.
1275# make M=dir clean Delete all automatically generated files
1276# make M=dir modules Make all modules in specified dir
1277# make M=dir Same as 'make M=dir modules'
1278# make M=dir modules_install
1279# Install the modules built in the module directory
1280# Assumes install directory is already created
1281
1282# We are always building modules
1283KBUILD_MODULES := 1
1284PHONY += crmodverdir
1285crmodverdir:
1286 $(cmd_crmodverdir)
1287
1288PHONY += $(objtree)/Module.symvers
1289$(objtree)/Module.symvers:
1290 @test -e $(objtree)/Module.symvers || ( \
1291 echo; \
1292 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1293 echo " is missing; modules will have no dependencies and modversions."; \
1294 echo )
1295
1296module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1297PHONY += $(module-dirs) modules
1298$(module-dirs): crmodverdir $(objtree)/Module.symvers
1299 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1300
1301modules: $(module-dirs)
1302 @$(kecho) ' Building modules, stage 2.';
1303 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1304
1305PHONY += modules_install
1306modules_install: _emodinst_ _emodinst_post
1307
1308install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1309PHONY += _emodinst_
1310_emodinst_:
1311 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1312 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1313
1314PHONY += _emodinst_post
1315_emodinst_post: _emodinst_
1316 $(call cmd,depmod)
1317
1318clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1319
1320PHONY += $(clean-dirs) clean
1321$(clean-dirs):
1322 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1323
1324clean: rm-dirs := $(MODVERDIR)
1325clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1326 $(KBUILD_EXTMOD)/modules.order \
1327 $(KBUILD_EXTMOD)/modules.builtin
1328clean: $(clean-dirs)
1329 $(call cmd,rmdirs)
1330 $(call cmd,rmfiles)
1331 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1332 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1333 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1334 -o -name '*.gcno' \) -type f -print | xargs rm -f
1335
1336help:
1337 @echo ' Building external modules.'
1338 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1339 @echo ''
1340 @echo ' modules - default target, build the module(s)'
1341 @echo ' modules_install - install the module'
1342 @echo ' clean - remove generated files in module directory only'
1343 @echo ''
1344
1345# Dummies...
1346PHONY += prepare scripts
1347prepare: ;
1348scripts: ;
1349endif # KBUILD_EXTMOD
1350
1351# Generate tags for editors
1352# ---------------------------------------------------------------------------
1353quiet_cmd_tags = GEN $@
1354 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1355
1356tags TAGS cscope: FORCE
1357 $(call cmd,tags)
1358
1359# Scripts to check various things for consistency
1360# ---------------------------------------------------------------------------
1361
1362includecheck:
1363 find * $(RCS_FIND_IGNORE) \
1364 -name '*.[hcS]' -type f -print | sort \
1365 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1366
1367versioncheck:
1368 find * $(RCS_FIND_IGNORE) \
1369 -name '*.[hcS]' -type f -print | sort \
1370 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1371
1372namespacecheck:
1373 $(PERL) $(srctree)/scripts/namespace.pl
1374
1375export_report:
1376 $(PERL) $(srctree)/scripts/export_report.pl
1377
1378endif #ifeq ($(config-targets),1)
1379endif #ifeq ($(mixed-targets),1)
1380
1381PHONY += checkstack kernelrelease kernelversion
1382
1383# UML needs a little special treatment here. It wants to use the host
1384# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1385# else wants $(ARCH), including people doing cross-builds, which means
1386# that $(SUBARCH) doesn't work here.
1387ifeq ($(ARCH), um)
1388CHECKSTACK_ARCH := $(SUBARCH)
1389else
1390CHECKSTACK_ARCH := $(ARCH)
1391endif
1392checkstack:
1393 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1394 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1395
1396kernelrelease:
1397 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1398 $(error kernelrelease not valid - run 'make prepare' to update it))
1399kernelversion:
1400 @echo $(KERNELVERSION)
1401
1402# Single targets
1403# ---------------------------------------------------------------------------
1404# Single targets are compatible with:
1405# - build with mixed source and output
1406# - build with separate output dir 'make O=...'
1407# - external modules
1408#
1409# target-dir => where to store outputfile
1410# build-dir => directory in kernel source tree to use
1411
1412ifeq ($(KBUILD_EXTMOD),)
1413 build-dir = $(patsubst %/,%,$(dir $@))
1414 target-dir = $(dir $@)
1415else
1416 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1417 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1418 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1419endif
1420
1421%.s: %.c prepare scripts FORCE
1422 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1423%.i: %.c prepare scripts FORCE
1424 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1425%.o: %.c prepare scripts FORCE
1426 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1427%.lst: %.c prepare scripts FORCE
1428 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1429%.s: %.S prepare scripts FORCE
1430 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1431%.o: %.S prepare scripts FORCE
1432 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1433%.symtypes: %.c prepare scripts FORCE
1434 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1435
1436# Modules
1437/: prepare scripts FORCE
1438 $(cmd_crmodverdir)
1439 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1440 $(build)=$(build-dir)
1441%/: prepare scripts FORCE
1442 $(cmd_crmodverdir)
1443 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1444 $(build)=$(build-dir)
1445%.ko: prepare scripts FORCE
1446 $(cmd_crmodverdir)
1447 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1448 $(build)=$(build-dir) $(@:.ko=.o)
1449 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1450
1451# FIXME Should go into a make.lib or something
1452# ===========================================================================
1453
1454quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1455 cmd_rmdirs = rm -rf $(rm-dirs)
1456
1457quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1458 cmd_rmfiles = rm -f $(rm-files)
1459
1460# Run depmod only if we have System.map and depmod is executable
1461quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1462 cmd_depmod = \
1463 if [ -r System.map -a -x $(DEPMOD) ]; then \
1464 $(DEPMOD) -ae -F System.map \
1465 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1466 $(KERNELRELEASE); \
1467 fi
1468
1469# Create temporary dir for module support files
1470# clean it up only when building all modules
1471cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1472 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1473
1474a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1475 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1476 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1477
1478quiet_cmd_as_o_S = AS $@
1479cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1480
1481# read all saved command lines
1482
1483targets := $(wildcard $(sort $(targets)))
1484cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1485
1486ifneq ($(cmd_files),)
1487 $(cmd_files): ; # Do not try to update included dependency files
1488 include $(cmd_files)
1489endif
1490
1491# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1492# Usage:
1493# $(Q)$(MAKE) $(clean)=dir
1494clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1495
1496endif # skip-makefile
1497
1498PHONY += FORCE
1499FORCE:
1500
1501# Declare the contents of the .PHONY variable as phony. We keep that
1502# information in a variable so we can use it in if_changed and friends.
1503.PHONY: $(PHONY)