xref: /openbmc/linux/Makefile (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 14
4EXTRAVERSION =
5NAME=Affluent Albatross
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 print "Entering directory ..."
14MAKEFLAGS += --no-print-directory
15
16# We are using a recursive build, so we need to do a little thinking
17# to get the ordering right.
18#
19# Most importantly: sub-Makefiles should only ever modify files in
20# their own directory. If in some directory we have a dependency on
21# a file in another dir (which doesn't happen often, but it's often
22# unavoidable when linking the built-in.o targets which finally
23# turn into vmlinux), we will call a sub make in that other dir, and
24# after that we are sure that everything which is in that other dir
25# is now up to date.
26#
27# The only cases where we need to modify files which have global
28# effects are thus separated out and done before the recursive
29# descending is started. They are now explicitly listed as the
30# prepare rule.
31
32# To put more focus on warnings, be less verbose as default
33# Use 'make V=1' to see the full commands
34
35ifdef V
36  ifeq ("$(origin V)", "command line")
37    KBUILD_VERBOSE = $(V)
38  endif
39endif
40ifndef KBUILD_VERBOSE
41  KBUILD_VERBOSE = 0
42endif
43
44# Call sparse as part of compilation of C files
45# Use 'make C=1' to enable sparse checking
46
47ifdef C
48  ifeq ("$(origin C)", "command line")
49    KBUILD_CHECKSRC = $(C)
50  endif
51endif
52ifndef KBUILD_CHECKSRC
53  KBUILD_CHECKSRC = 0
54endif
55
56# Use make M=dir to specify directory of external module to build
57# Old syntax make ... SUBDIRS=$PWD is still supported
58# Setting the environment variable KBUILD_EXTMOD take precedence
59ifdef SUBDIRS
60  KBUILD_EXTMOD ?= $(SUBDIRS)
61endif
62ifdef M
63  ifeq ("$(origin M)", "command line")
64    KBUILD_EXTMOD := $(M)
65  endif
66endif
67
68
69# kbuild supports saving output files in a separate directory.
70# To locate output files in a separate directory two syntaxes are supported.
71# In both cases the working directory must be the root of the kernel src.
72# 1) O=
73# Use "make O=dir/to/store/output/files/"
74#
75# 2) Set KBUILD_OUTPUT
76# Set the environment variable KBUILD_OUTPUT to point to the directory
77# where the output files shall be placed.
78# export KBUILD_OUTPUT=dir/to/store/output/files/
79# make
80#
81# The O= assignment takes precedence over the KBUILD_OUTPUT environment
82# variable.
83
84
85# KBUILD_SRC is set on invocation of make in OBJ directory
86# KBUILD_SRC is not intended to be used by the regular user (for now)
87ifeq ($(KBUILD_SRC),)
88
89# OK, Make called in directory where kernel src resides
90# Do we want to locate output files in a separate directory?
91ifdef O
92  ifeq ("$(origin O)", "command line")
93    KBUILD_OUTPUT := $(O)
94  endif
95endif
96
97# That's our default target when none is given on the command line
98.PHONY: _all
99_all:
100
101ifneq ($(KBUILD_OUTPUT),)
102# Invoke a second make in the output directory, passing relevant variables
103# check that the output directory actually exists
104saved-output := $(KBUILD_OUTPUT)
105KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
106$(if $(KBUILD_OUTPUT),, \
107     $(error output directory "$(saved-output)" does not exist))
108
109.PHONY: $(MAKECMDGOALS)
110
111$(filter-out _all,$(MAKECMDGOALS)) _all:
112	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
113	KBUILD_SRC=$(CURDIR) \
114	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
115
116# Leave processing to above invocation of make
117skip-makefile := 1
118endif # ifneq ($(KBUILD_OUTPUT),)
119endif # ifeq ($(KBUILD_SRC),)
120
121# We process the rest of the Makefile if this is the final invocation of make
122ifeq ($(skip-makefile),)
123
124# If building an external module we do not care about the all: rule
125# but instead _all depend on modules
126.PHONY: all
127ifeq ($(KBUILD_EXTMOD),)
128_all: all
129else
130_all: modules
131endif
132
133srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
134TOPDIR		:= $(srctree)
135# FIXME - TOPDIR is obsolete, use srctree/objtree
136objtree		:= $(CURDIR)
137src		:= $(srctree)
138obj		:= $(objtree)
139
140VPATH		:= $(srctree)
141
142export srctree objtree VPATH TOPDIR
143
144nullstring :=
145space      := $(nullstring) # end of line
146
147# Take the contents of any files called localversion* and the config
148# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
149# careful not to include files twice if building in the source
150# directory. LOCALVERSION from the command line override all of this
151
152localver := $(objtree)/localversion* $(srctree)/localversion*
153localver := $(sort $(wildcard $(localver)))
154# skip backup files (containing '~')
155localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
156
157LOCALVERSION = $(subst $(space),, \
158	       $(shell cat /dev/null $(localver)) \
159	       $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
160
161KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
162
163# SUBARCH tells the usermode build what the underlying arch is.  That is set
164# first, and if a usermode build is happening, the "ARCH=um" on the command
165# line overrides the setting of ARCH below.  If a native build is happening,
166# then ARCH is assigned, getting whatever value it gets normally, and
167# SUBARCH is subsequently ignored.
168
169SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
170				  -e s/arm.*/arm/ -e s/sa110/arm/ \
171				  -e s/s390x/s390/ -e s/parisc64/parisc/ )
172
173# Cross compiling and selecting different set of gcc/bin-utils
174# ---------------------------------------------------------------------------
175#
176# When performing cross compilation for other architectures ARCH shall be set
177# to the target architecture. (See arch/* for the possibilities).
178# ARCH can be set during invocation of make:
179# make ARCH=ia64
180# Another way is to have ARCH set in the environment.
181# The default ARCH is the host where make is executed.
182
183# CROSS_COMPILE specify the prefix used for all executables used
184# during compilation. Only gcc and related bin-utils executables
185# are prefixed with $(CROSS_COMPILE).
186# CROSS_COMPILE can be set on the command line
187# make CROSS_COMPILE=ia64-linux-
188# Alternatively CROSS_COMPILE can be set in the environment.
189# Default value for CROSS_COMPILE is not to prefix executables
190# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
191
192ARCH		?= $(SUBARCH)
193CROSS_COMPILE	?=
194
195# Architecture as present in compile.h
196UTS_MACHINE := $(ARCH)
197
198# SHELL used by kbuild
199CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
200	  else if [ -x /bin/bash ]; then echo /bin/bash; \
201	  else echo sh; fi ; fi)
202
203HOSTCC  	= gcc
204HOSTCXX  	= g++
205HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
206HOSTCXXFLAGS	= -O2
207
208# 	Decide whether to build built-in, modular, or both.
209#	Normally, just do built-in.
210
211KBUILD_MODULES :=
212KBUILD_BUILTIN := 1
213
214#	If we have only "make modules", don't compile built-in objects.
215#	When we're building modules with modversions, we need to consider
216#	the built-in objects during the descend as well, in order to
217#	make sure the checksums are uptodate before we record them.
218
219ifeq ($(MAKECMDGOALS),modules)
220  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
221endif
222
223#	If we have "make <whatever> modules", compile modules
224#	in addition to whatever we do anyway.
225#	Just "make" or "make all" shall build modules as well
226
227ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
228  KBUILD_MODULES := 1
229endif
230
231ifeq ($(MAKECMDGOALS),)
232  KBUILD_MODULES := 1
233endif
234
235export KBUILD_MODULES KBUILD_BUILTIN
236export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
237
238# Beautify output
239# ---------------------------------------------------------------------------
240#
241# Normally, we echo the whole command before executing it. By making
242# that echo $($(quiet)$(cmd)), we now have the possibility to set
243# $(quiet) to choose other forms of output instead, e.g.
244#
245#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
246#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
247#
248# If $(quiet) is empty, the whole command will be printed.
249# If it is set to "quiet_", only the short version will be printed.
250# If it is set to "silent_", nothing wil be printed at all, since
251# the variable $(silent_cmd_cc_o_c) doesn't exist.
252#
253# A simple variant is to prefix commands with $(Q) - that's usefull
254# for commands that shall be hidden in non-verbose mode.
255#
256#	$(Q)ln $@ :<
257#
258# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
259# If KBUILD_VERBOSE equals 1 then the above command is displayed.
260
261ifeq ($(KBUILD_VERBOSE),1)
262  quiet =
263  Q =
264else
265  quiet=quiet_
266  Q = @
267endif
268
269# If the user is running make -s (silent mode), suppress echoing of
270# commands
271
272ifneq ($(findstring s,$(MAKEFLAGS)),)
273  quiet=silent_
274endif
275
276export quiet Q KBUILD_VERBOSE
277
278######
279# cc support functions to be used (only) in arch/$(ARCH)/Makefile
280# See documentation in Documentation/kbuild/makefiles.txt
281
282# cc-option
283# Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
284
285cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
286             > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
287
288# For backward compatibility
289check_gcc = $(warning check_gcc is deprecated - use cc-option) \
290            $(call cc-option, $(1),$(2))
291
292# cc-option-yn
293# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
294cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
295                > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
296
297# cc-option-align
298# Prefix align with either -falign or -malign
299cc-option-align = $(subst -functions=0,,\
300	$(call cc-option,-falign-functions=0,-malign-functions=0))
301
302# cc-version
303# Usage gcc-ver := $(call cc-version $(CC))
304cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
305              $(if $(1), $(1), $(CC)))
306
307
308# Look for make include files relative to root of kernel src
309MAKEFLAGS += --include-dir=$(srctree)
310
311# We need some generic definitions
312include  $(srctree)/scripts/Kbuild.include
313
314# For maximum performance (+ possibly random breakage, uncomment
315# the following)
316
317#MAKEFLAGS += -rR
318
319# Make variables (CC, etc...)
320
321AS		= $(CROSS_COMPILE)as
322LD		= $(CROSS_COMPILE)ld
323CC		= $(CROSS_COMPILE)gcc
324CPP		= $(CC) -E
325AR		= $(CROSS_COMPILE)ar
326NM		= $(CROSS_COMPILE)nm
327STRIP		= $(CROSS_COMPILE)strip
328OBJCOPY		= $(CROSS_COMPILE)objcopy
329OBJDUMP		= $(CROSS_COMPILE)objdump
330AWK		= awk
331GENKSYMS	= scripts/genksyms/genksyms
332DEPMOD		= /sbin/depmod
333KALLSYMS	= scripts/kallsyms
334PERL		= perl
335CHECK		= sparse
336
337CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
338MODFLAGS	= -DMODULE
339CFLAGS_MODULE   = $(MODFLAGS)
340AFLAGS_MODULE   = $(MODFLAGS)
341LDFLAGS_MODULE  = -r
342CFLAGS_KERNEL	=
343AFLAGS_KERNEL	=
344
345
346# Use LINUXINCLUDE when you must reference the include/ directory.
347# Needed to be compatible with the O= option
348LINUXINCLUDE    := -Iinclude \
349                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
350		   -imacros include/linux/autoconf.h
351
352CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
353
354CFLAGS 		:= -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
355	  	   -fno-strict-aliasing -fno-common \
356		   -ffreestanding
357AFLAGS		:= -D__ASSEMBLY__
358
359export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
360	ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
361	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
362	HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
363
364export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
365export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
366export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
367
368# When compiling out-of-tree modules, put MODVERDIR in the module
369# tree rather than in the kernel tree. The kernel tree might
370# even be read-only.
371export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
372
373# Files to ignore in find ... statements
374
375RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
376export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
377
378# ===========================================================================
379# Rules shared between *config targets and build targets
380
381# Basic helpers built in scripts/
382.PHONY: scripts_basic
383scripts_basic:
384	$(Q)$(MAKE) $(build)=scripts/basic
385
386# To avoid any implicit rule to kick in, define an empty command.
387scripts/basic/%: scripts_basic ;
388
389.PHONY: outputmakefile
390# outputmakefile generate a Makefile to be placed in output directory, if
391# using a seperate output directory. This allows convinient use
392# of make in output directory
393outputmakefile:
394	$(Q)if test ! $(srctree) -ef $(objtree); then \
395	$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile              \
396	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)         \
397	    > $(objtree)/Makefile;                                 \
398	    echo '  GEN    $(objtree)/Makefile';                   \
399	fi
400
401# To make sure we do not include .config for any of the *config targets
402# catch them early, and hand them over to scripts/kconfig/Makefile
403# It is allowed to specify more targets when calling make, including
404# mixing *config targets and build targets.
405# For example 'make oldconfig all'.
406# Detect when mixed targets is specified, and make a second invocation
407# of make so .config is not included in this case either (for *config).
408
409no-dot-config-targets := clean mrproper distclean \
410			 cscope TAGS tags help %docs check%
411
412config-targets := 0
413mixed-targets  := 0
414dot-config     := 1
415
416ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
417	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
418		dot-config := 0
419	endif
420endif
421
422ifeq ($(KBUILD_EXTMOD),)
423        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
424                config-targets := 1
425                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
426                        mixed-targets := 1
427                endif
428        endif
429endif
430
431ifeq ($(mixed-targets),1)
432# ===========================================================================
433# We're called with mixed targets (*config and build targets).
434# Handle them one by one.
435
436%:: FORCE
437	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
438
439else
440ifeq ($(config-targets),1)
441# ===========================================================================
442# *config targets only - make sure prerequisites are updated, and descend
443# in scripts/kconfig to make the *config target
444
445# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
446# KBUILD_DEFCONFIG may point out an alternative default configuration
447# used for 'make defconfig'
448include $(srctree)/arch/$(ARCH)/Makefile
449export KBUILD_DEFCONFIG
450
451config %config: scripts_basic outputmakefile FORCE
452	$(Q)mkdir -p include/linux
453	$(Q)$(MAKE) $(build)=scripts/kconfig $@
454
455else
456# ===========================================================================
457# Build targets only - this includes vmlinux, arch specific targets, clean
458# targets and others. In general all targets except *config targets.
459
460ifeq ($(KBUILD_EXTMOD),)
461# Additional helpers built in scripts/
462# Carefully list dependencies so we do not try to build scripts twice
463# in parrallel
464.PHONY: scripts
465scripts: scripts_basic include/config/MARKER
466	$(Q)$(MAKE) $(build)=$(@)
467
468scripts_basic: include/linux/autoconf.h
469
470# Objects we will link into vmlinux / subdirs we need to visit
471init-y		:= init/
472drivers-y	:= drivers/ sound/
473net-y		:= net/
474libs-y		:= lib/
475core-y		:= usr/
476endif # KBUILD_EXTMOD
477
478ifeq ($(dot-config),1)
479# In this section, we need .config
480
481# Read in dependencies to all Kconfig* files, make sure to run
482# oldconfig if changes are detected.
483-include .config.cmd
484
485include .config
486
487# If .config needs to be updated, it will be done via the dependency
488# that autoconf has on .config.
489# To avoid any implicit rule to kick in, define an empty command
490.config: ;
491
492# If .config is newer than include/linux/autoconf.h, someone tinkered
493# with it and forgot to run make oldconfig
494include/linux/autoconf.h: .config
495	$(Q)mkdir -p include/linux
496	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
497else
498# Dummy target needed, because used as prerequisite
499include/linux/autoconf.h: ;
500endif
501
502# The all: target is the default when no target is given on the
503# command line.
504# This allow a user to issue only 'make' to build a kernel including modules
505# Defaults vmlinux but it is usually overriden in the arch makefile
506all: vmlinux
507
508ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
509CFLAGS		+= -Os
510else
511CFLAGS		+= -O2
512endif
513
514#Add align options if CONFIG_CC_* is not equal to 0
515add-align = $(if $(filter-out 0,$($(1))),$(cc-option-align)$(2)=$($(1)))
516CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_FUNCTIONS,-functions)
517CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_LABELS,-labels)
518CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_LOOPS,-loops)
519CFLAGS		+= $(call add-align,CONFIG_CC_ALIGN_JUMPS,-jumps)
520
521ifdef CONFIG_FRAME_POINTER
522CFLAGS		+= -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
523else
524CFLAGS		+= -fomit-frame-pointer
525endif
526
527ifdef CONFIG_DEBUG_INFO
528CFLAGS		+= -g
529endif
530
531include $(srctree)/arch/$(ARCH)/Makefile
532
533# arch Makefile may override CC so keep this after arch Makefile is included
534NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
535CHECKFLAGS     += $(NOSTDINC_FLAGS)
536
537# warn about C99 declaration after statement
538CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
539
540# disable pointer signedness warnings in gcc 4.0
541CFLAGS += $(call cc-option,-Wno-pointer-sign,)
542
543# Default kernel image to build when no specific target is given.
544# KBUILD_IMAGE may be overruled on the commandline or
545# set in the environment
546# Also any assignments in arch/$(ARCH)/Makefile take precedence over
547# this default value
548export KBUILD_IMAGE ?= vmlinux
549
550#
551# INSTALL_PATH specifies where to place the updated kernel and system map
552# images. Default is /boot, but you can set it to other values
553export	INSTALL_PATH ?= /boot
554
555# If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests
556# and try to determine if the current source tree is a release tree, of any sort,
557# or if is a pure development tree.
558#
559# A 'release tree' is any tree with a git TAG associated
560# with it.  The primary goal of this is to make it safe for a native
561# git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to
562# continue developing against the current Linus tree, without having the Linus
563# tree overwrite the 2.6.9 tree when installed.
564#
565# Currently, only git is supported.
566# Other SCMs can edit scripts/setlocalversion and add the appropriate
567# checks as needed.
568
569
570ifdef CONFIG_LOCALVERSION_AUTO
571	localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
572	LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
573endif
574
575#
576# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
577# relocations required by build roots.  This is not defined in the
578# makefile but the arguement can be passed to make if needed.
579#
580
581MODLIB	:= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
582export MODLIB
583
584
585ifeq ($(KBUILD_EXTMOD),)
586core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/
587
588vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
589		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
590		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
591
592vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
593		     $(init-n) $(init-) \
594		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
595		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
596
597init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
598core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
599drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
600net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
601libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
602libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
603libs-y		:= $(libs-y1) $(libs-y2)
604
605# Build vmlinux
606# ---------------------------------------------------------------------------
607# vmlinux is build from the objects selected by $(vmlinux-init) and
608# $(vmlinux-main). Most are built-in.o files from top-level directories
609# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
610# Ordering when linking is important, and $(vmlinux-init) must be first.
611#
612# vmlinux
613#   ^
614#   |
615#   +-< $(vmlinux-init)
616#   |   +--< init/version.o + more
617#   |
618#   +--< $(vmlinux-main)
619#   |    +--< driver/built-in.o mm/built-in.o + more
620#   |
621#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
622#
623# vmlinux version (uname -v) cannot be updated during normal
624# descending-into-subdirs phase since we do not yet know if we need to
625# update vmlinux.
626# Therefore this step is delayed until just before final link of vmlinux -
627# except in the kallsyms case where it is done just before adding the
628# symbols to the kernel.
629#
630# System.map is generated to document addresses of all kernel symbols
631
632vmlinux-init := $(head-y) $(init-y)
633vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
634vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
635vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
636
637# Rule to link vmlinux - also used during CONFIG_KALLSYMS
638# May be overridden by arch/$(ARCH)/Makefile
639quiet_cmd_vmlinux__ ?= LD      $@
640      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
641      -T $(vmlinux-lds) $(vmlinux-init)                          \
642      --start-group $(vmlinux-main) --end-group                  \
643      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
644
645# Generate new vmlinux version
646quiet_cmd_vmlinux_version = GEN     .version
647      cmd_vmlinux_version = set -e;                     \
648	if [ ! -r .version ]; then			\
649	  rm -f .version;				\
650	  echo 1 >.version;				\
651	else						\
652	  mv .version .old_version;			\
653	  expr 0$$(cat .old_version) + 1 >.version;	\
654	fi;						\
655	$(MAKE) $(build)=init
656
657# Generate System.map
658quiet_cmd_sysmap = SYSMAP
659      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
660
661# Link of vmlinux
662# If CONFIG_KALLSYMS is set .version is already updated
663# Generate System.map and verify that the content is consistent
664# Use + in front of the vmlinux_version rule to silent warning with make -j2
665# First command is ':' to allow us to use + in front of the rule
666define rule_vmlinux__
667	:
668	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
669
670	$(call cmd,vmlinux__)
671	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
672
673	$(Q)$(if $($(quiet)cmd_sysmap),                 \
674	  echo '  $($(quiet)cmd_sysmap) System.map' &&) \
675	$(cmd_sysmap) $@ System.map;                    \
676	if [ $$? -ne 0 ]; then                          \
677		rm -f $@;                               \
678		/bin/false;                             \
679	fi;
680	$(verify_kallsyms)
681endef
682
683
684ifdef CONFIG_KALLSYMS
685# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
686# It's a three stage process:
687# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
688#   empty
689#   Running kallsyms on that gives us .tmp_kallsyms1.o with
690#   the right size - vmlinux version (uname -v) is updated during this step
691# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
692#   but due to the added section, some addresses have shifted.
693#   From here, we generate a correct .tmp_kallsyms2.o
694# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
695# o Verify that the System.map from vmlinux matches the map from
696#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
697# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
698#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
699#   temporary bypass to allow the kernel to be built while the
700#   maintainers work out what went wrong with kallsyms.
701
702ifdef CONFIG_KALLSYMS_EXTRA_PASS
703last_kallsyms := 3
704else
705last_kallsyms := 2
706endif
707
708kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
709
710define verify_kallsyms
711	$(Q)$(if $($(quiet)cmd_sysmap),                       \
712	  echo '  $($(quiet)cmd_sysmap) .tmp_System.map' &&)  \
713	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
714	$(Q)cmp -s System.map .tmp_System.map ||              \
715		(echo Inconsistent kallsyms data;             \
716		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
717		 rm .tmp_kallsyms* ; /bin/false )
718endef
719
720# Update vmlinux version before link
721# Use + in front of this rule to silent warning about make -j1
722# First command is ':' to allow us to use + in front of this rule
723cmd_ksym_ld = $(cmd_vmlinux__)
724define rule_ksym_ld
725	:
726	+$(call cmd,vmlinux_version)
727	$(call cmd,vmlinux__)
728	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
729endef
730
731# Generate .S file with all kernel symbols
732quiet_cmd_kallsyms = KSYM    $@
733      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
734                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
735
736.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
737	$(call if_changed_dep,as_o_S)
738
739.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
740	$(call cmd,kallsyms)
741
742# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
743.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
744	$(call if_changed_rule,ksym_ld)
745
746.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
747	$(call if_changed,vmlinux__)
748
749.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
750	$(call if_changed,vmlinux__)
751
752# Needs to visit scripts/ before $(KALLSYMS) can be used.
753$(KALLSYMS): scripts ;
754
755# Generate some data for debugging strange kallsyms problems
756debug_kallsyms: .tmp_map$(last_kallsyms)
757
758.tmp_map%: .tmp_vmlinux% FORCE
759	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
760
761.tmp_map3: .tmp_map2
762
763.tmp_map2: .tmp_map1
764
765endif # ifdef CONFIG_KALLSYMS
766
767# vmlinux image - including updated kernel symbols
768vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
769	$(call if_changed_rule,vmlinux__)
770	$(Q)rm -f .old_version
771
772# The actual objects are generated when descending,
773# make sure no implicit rule kicks in
774$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
775
776# Handle descending into subdirectories listed in $(vmlinux-dirs)
777# Preset locale variables to speed up the build process. Limit locale
778# tweaks to this spot to avoid wrong language settings when running
779# make menuconfig etc.
780# Error messages still appears in the original language
781
782.PHONY: $(vmlinux-dirs)
783$(vmlinux-dirs): prepare scripts
784	$(Q)$(MAKE) $(build)=$@
785
786# Things we need to do before we recursively start building the kernel
787# or the modules are listed in "prepare".
788# A multi level approach is used. prepareN is processed before prepareN-1.
789# archprepare is used in arch Makefiles and when processed asm symlink,
790# version.h and scripts_basic is processed / created.
791
792# Listed in dependency order
793.PHONY: prepare archprepare prepare0 prepare1 prepare2 prepare3
794
795# prepare-all is deprecated, use prepare as valid replacement
796.PHONY: prepare-all
797
798# prepare3 is used to check if we are building in a separate output directory,
799# and if so do:
800# 1) Check that make has not been executed in the kernel src $(srctree)
801# 2) Create the include2 directory, used for the second asm symlink
802
803prepare3:
804ifneq ($(KBUILD_SRC),)
805	@echo '  Using $(srctree) as source for kernel'
806	$(Q)if [ -f $(srctree)/.config ]; then \
807		echo "  $(srctree) is not clean, please run 'make mrproper'";\
808		echo "  in the '$(srctree)' directory.";\
809		/bin/false; \
810	fi;
811	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
812	$(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
813endif
814
815# prepare2 creates a makefile if using a separate output directory
816prepare2: prepare3 outputmakefile
817
818prepare1: prepare2 include/linux/version.h include/asm \
819                   include/config/MARKER
820ifneq ($(KBUILD_MODULES),)
821	$(Q)rm -rf $(MODVERDIR)
822	$(Q)mkdir -p $(MODVERDIR)
823endif
824
825archprepare: prepare1 scripts_basic
826
827prepare0: archprepare FORCE
828	$(Q)$(MAKE) $(build)=.
829
830# All the preparing..
831prepare prepare-all: prepare0
832
833#	Leave this as default for preprocessing vmlinux.lds.S, which is now
834#	done in arch/$(ARCH)/kernel/Makefile
835
836export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
837
838# Single targets
839# ---------------------------------------------------------------------------
840
841%.s: %.c scripts FORCE
842	$(Q)$(MAKE) $(build)=$(@D) $@
843%.i: %.c scripts FORCE
844	$(Q)$(MAKE) $(build)=$(@D) $@
845%.o: %.c scripts FORCE
846	$(Q)$(MAKE) $(build)=$(@D) $@
847%.ko: scripts FORCE
848	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
849	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
850%/:      scripts prepare FORCE
851	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
852%.lst: %.c scripts FORCE
853	$(Q)$(MAKE) $(build)=$(@D) $@
854%.s: %.S scripts FORCE
855	$(Q)$(MAKE) $(build)=$(@D) $@
856%.o: %.S scripts FORCE
857	$(Q)$(MAKE) $(build)=$(@D) $@
858
859# 	FIXME: The asm symlink changes when $(ARCH) changes. That's
860#	hard to detect, but I suppose "make mrproper" is a good idea
861#	before switching between archs anyway.
862
863include/asm:
864	@echo '  SYMLINK $@ -> include/asm-$(ARCH)'
865	$(Q)if [ ! -d include ]; then mkdir -p include; fi;
866	@ln -fsn asm-$(ARCH) $@
867
868# 	Split autoconf.h into include/linux/config/*
869
870include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
871	@echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
872	@scripts/basic/split-include include/linux/autoconf.h include/config
873	@touch $@
874
875# Generate some files
876# ---------------------------------------------------------------------------
877
878# KERNELRELEASE can change from a few different places, meaning version.h
879# needs to be updated, so this check is forced on all builds
880
881uts_len := 64
882
883define filechk_version.h
884	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
885	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
886	  exit 1; \
887	fi; \
888	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
889	  echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
890	 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
891	)
892endef
893
894include/linux/version.h: $(srctree)/Makefile FORCE
895	$(call filechk,version.h)
896
897# ---------------------------------------------------------------------------
898
899.PHONY: depend dep
900depend dep:
901	@echo '*** Warning: make $@ is unnecessary now.'
902
903# ---------------------------------------------------------------------------
904# Modules
905
906ifdef CONFIG_MODULES
907
908# 	By default, build modules as well
909
910all: modules
911
912#	Build modules
913
914.PHONY: modules
915modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
916	@echo '  Building modules, stage 2.';
917	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
918
919
920# Target to prepare building external modules
921.PHONY: modules_prepare
922modules_prepare: prepare scripts
923
924# Target to install modules
925.PHONY: modules_install
926modules_install: _modinst_ _modinst_post
927
928.PHONY: _modinst_
929_modinst_:
930	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
931		echo "Warning: you may need to install module-init-tools"; \
932		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
933		sleep 1; \
934	fi
935	@rm -rf $(MODLIB)/kernel
936	@rm -f $(MODLIB)/source
937	@mkdir -p $(MODLIB)/kernel
938	@ln -s $(srctree) $(MODLIB)/source
939	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
940		rm -f $(MODLIB)/build ; \
941		ln -s $(objtree) $(MODLIB)/build ; \
942	fi
943	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
944
945# If System.map exists, run depmod.  This deliberately does not have a
946# dependency on System.map since that would run the dependency tree on
947# vmlinux.  This depmod is only for convenience to give the initial
948# boot a modules.dep even before / is mounted read-write.  However the
949# boot script depmod is the master version.
950ifeq "$(strip $(INSTALL_MOD_PATH))" ""
951depmod_opts	:=
952else
953depmod_opts	:= -b $(INSTALL_MOD_PATH) -r
954endif
955.PHONY: _modinst_post
956_modinst_post: _modinst_
957	if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
958
959else # CONFIG_MODULES
960
961# Modules not configured
962# ---------------------------------------------------------------------------
963
964modules modules_install: FORCE
965	@echo
966	@echo "The present kernel configuration has modules disabled."
967	@echo "Type 'make config' and enable loadable module support."
968	@echo "Then build a kernel with module support enabled."
969	@echo
970	@exit 1
971
972endif # CONFIG_MODULES
973
974###
975# Cleaning is done on three levels.
976# make clean     Delete most generated files
977#                Leave enough to build external modules
978# make mrproper  Delete the current configuration, and all generated files
979# make distclean Remove editor backup files, patch leftover files and the like
980
981# Directories & files removed with 'make clean'
982CLEAN_DIRS  += $(MODVERDIR)
983CLEAN_FILES +=	vmlinux System.map \
984                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
985
986# Directories & files removed with 'make mrproper'
987MRPROPER_DIRS  += include/config include2
988MRPROPER_FILES += .config .config.old include/asm .version \
989                  include/linux/autoconf.h include/linux/version.h \
990                  Module.symvers tags TAGS cscope*
991
992# clean - Delete most, but leave enough to build external modules
993#
994clean: rm-dirs  := $(CLEAN_DIRS)
995clean: rm-files := $(CLEAN_FILES)
996clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
997
998.PHONY: $(clean-dirs) clean archclean
999$(clean-dirs):
1000	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1001
1002clean: archclean $(clean-dirs)
1003	$(call cmd,rmdirs)
1004	$(call cmd,rmfiles)
1005	@find . $(RCS_FIND_IGNORE) \
1006	 	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1007		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1008		-type f -print | xargs rm -f
1009
1010# mrproper - Delete all generated files, including .config
1011#
1012mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1013mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1014mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1015
1016.PHONY: $(mrproper-dirs) mrproper archmrproper
1017$(mrproper-dirs):
1018	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1019
1020mrproper: clean archmrproper $(mrproper-dirs)
1021	$(call cmd,rmdirs)
1022	$(call cmd,rmfiles)
1023
1024# distclean
1025#
1026.PHONY: distclean
1027
1028distclean: mrproper
1029	@find $(srctree) $(RCS_FIND_IGNORE) \
1030	 	\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1031		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1032	 	-o -name '.*.rej' -o -size 0 \
1033		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1034		-type f -print | xargs rm -f
1035
1036
1037# Packaging of the kernel to various formats
1038# ---------------------------------------------------------------------------
1039# rpm target kept for backward compatibility
1040package-dir	:= $(srctree)/scripts/package
1041
1042.PHONY: %-pkg rpm
1043
1044%pkg: FORCE
1045	$(Q)$(MAKE) -f $(package-dir)/Makefile $@
1046rpm: FORCE
1047	$(Q)$(MAKE) -f $(package-dir)/Makefile $@
1048
1049
1050# Brief documentation of the typical targets used
1051# ---------------------------------------------------------------------------
1052
1053boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1054boards := $(notdir $(boards))
1055
1056help:
1057	@echo  'Cleaning targets:'
1058	@echo  '  clean		  - remove most generated files but keep the config'
1059	@echo  '  mrproper	  - remove all generated files + config + various backup files'
1060	@echo  ''
1061	@echo  'Configuration targets:'
1062	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1063	@echo  ''
1064	@echo  'Other generic targets:'
1065	@echo  '  all		  - Build all targets marked with [*]'
1066	@echo  '* vmlinux	  - Build the bare kernel'
1067	@echo  '* modules	  - Build all modules'
1068	@echo  '  modules_install - Install all modules'
1069	@echo  '  dir/            - Build all files in dir and below'
1070	@echo  '  dir/file.[ois]  - Build specified target only'
1071	@echo  '  dir/file.ko     - Build module including final link'
1072	@echo  '  rpm		  - Build a kernel as an RPM package'
1073	@echo  '  tags/TAGS	  - Generate tags file for editors'
1074	@echo  '  cscope	  - Generate cscope index'
1075	@echo  '  kernelrelease	  - Output the release version string'
1076	@echo  ''
1077	@echo  'Static analysers'
1078	@echo  '  buildcheck      - List dangling references to vmlinux discarded sections'
1079	@echo  '                    and init sections from non-init sections'
1080	@echo  '  checkstack      - Generate a list of stack hogs'
1081	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1082	@echo  ''
1083	@echo  'Kernel packaging:'
1084	@$(MAKE) -f $(package-dir)/Makefile help
1085	@echo  ''
1086	@echo  'Documentation targets:'
1087	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1088	@echo  ''
1089	@echo  'Architecture specific targets ($(ARCH)):'
1090	@$(if $(archhelp),$(archhelp),\
1091		echo '  No architecture specific help defined for $(ARCH)')
1092	@echo  ''
1093	@$(if $(boards), \
1094		$(foreach b, $(boards), \
1095		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1096		echo '')
1097
1098	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1099	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1100	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse)'
1101	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK (sparse)'
1102	@echo  ''
1103	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1104	@echo  'For further info see the ./README file'
1105
1106
1107# Documentation targets
1108# ---------------------------------------------------------------------------
1109%docs: scripts_basic FORCE
1110	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1111
1112else # KBUILD_EXTMOD
1113
1114###
1115# External module support.
1116# When building external modules the kernel used as basis is considered
1117# read-only, and no consistency checks are made and the make
1118# system is not used on the basis kernel. If updates are required
1119# in the basis kernel ordinary make commands (without M=...) must
1120# be used.
1121#
1122# The following are the only valid targets when building external
1123# modules.
1124# make M=dir clean     Delete all automatically generated files
1125# make M=dir modules   Make all modules in specified dir
1126# make M=dir	       Same as 'make M=dir modules'
1127# make M=dir modules_install
1128#                      Install the modules build in the module directory
1129#                      Assumes install directory is already created
1130
1131# We are always building modules
1132KBUILD_MODULES := 1
1133.PHONY: crmodverdir
1134crmodverdir:
1135	$(Q)mkdir -p $(MODVERDIR)
1136
1137.PHONY: $(objtree)/Module.symvers
1138$(objtree)/Module.symvers:
1139	@test -e $(objtree)/Module.symvers || ( \
1140	echo; \
1141	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1142	echo "           is missing; modules will have no dependencies and modversions."; \
1143	echo )
1144
1145module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1146.PHONY: $(module-dirs) modules
1147$(module-dirs): crmodverdir $(objtree)/Module.symvers
1148	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1149
1150modules: $(module-dirs)
1151	@echo '  Building modules, stage 2.';
1152	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1153
1154.PHONY: modules_install
1155modules_install:
1156	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1157
1158clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1159
1160.PHONY: $(clean-dirs) clean
1161$(clean-dirs):
1162	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1163
1164clean:	rm-dirs := $(MODVERDIR)
1165clean: $(clean-dirs)
1166	$(call cmd,rmdirs)
1167	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1168	 	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1169		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1170		-type f -print | xargs rm -f
1171
1172help:
1173	@echo  '  Building external modules.'
1174	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1175	@echo  ''
1176	@echo  '  modules         - default target, build the module(s)'
1177	@echo  '  modules_install - install the module'
1178	@echo  '  clean           - remove generated files in module directory only'
1179	@echo  ''
1180endif # KBUILD_EXTMOD
1181
1182# Generate tags for editors
1183# ---------------------------------------------------------------------------
1184
1185#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1186#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1187#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1188
1189ifeq ($(src),$(obj))
1190__srctree =
1191else
1192__srctree = $(srctree)/
1193endif
1194
1195ALLSOURCE_ARCHS := $(ARCH)
1196
1197define all-sources
1198	( find $(__srctree) $(RCS_FIND_IGNORE) \
1199	       \( -name include -o -name arch \) -prune -o \
1200	       -name '*.[chS]' -print; \
1201	  for ARCH in $(ALLSOURCE_ARCHS) ; do \
1202	       find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1203	            -name '*.[chS]' -print; \
1204	  done ; \
1205	  find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1206	       -name '*.[chS]' -print; \
1207	  find $(__srctree)include $(RCS_FIND_IGNORE) \
1208	       \( -name config -o -name 'asm-*' \) -prune \
1209	       -o -name '*.[chS]' -print; \
1210	  for ARCH in $(ALLSOURCE_ARCHS) ; do \
1211	       find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1212	            -name '*.[chS]' -print; \
1213	  done ; \
1214	  find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1215	       -name '*.[chS]' -print )
1216endef
1217
1218quiet_cmd_cscope-file = FILELST cscope.files
1219      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1220
1221quiet_cmd_cscope = MAKE    cscope.out
1222      cmd_cscope = cscope -b
1223
1224cscope: FORCE
1225	$(call cmd,cscope-file)
1226	$(call cmd,cscope)
1227
1228quiet_cmd_TAGS = MAKE   $@
1229define cmd_TAGS
1230	rm -f $@; \
1231	ETAGSF=`etags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1232	$(all-sources) | xargs etags $$ETAGSF -a
1233endef
1234
1235TAGS: FORCE
1236	$(call cmd,TAGS)
1237
1238
1239quiet_cmd_tags = MAKE   $@
1240define cmd_tags
1241	rm -f $@; \
1242	CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_GPL --extra=+f"`; \
1243	$(all-sources) | xargs ctags $$CTAGSF -a
1244endef
1245
1246tags: FORCE
1247	$(call cmd,tags)
1248
1249
1250# Scripts to check various things for consistency
1251# ---------------------------------------------------------------------------
1252
1253includecheck:
1254	find * $(RCS_FIND_IGNORE) \
1255		-name '*.[hcS]' -type f -print | sort \
1256		| xargs $(PERL) -w scripts/checkincludes.pl
1257
1258versioncheck:
1259	find * $(RCS_FIND_IGNORE) \
1260		-name '*.[hcS]' -type f -print | sort \
1261		| xargs $(PERL) -w scripts/checkversion.pl
1262
1263buildcheck:
1264	$(PERL) $(srctree)/scripts/reference_discarded.pl
1265	$(PERL) $(srctree)/scripts/reference_init.pl
1266
1267namespacecheck:
1268	$(PERL) $(srctree)/scripts/namespace.pl
1269
1270endif #ifeq ($(config-targets),1)
1271endif #ifeq ($(mixed-targets),1)
1272
1273.PHONY: checkstack
1274checkstack:
1275	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1276	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1277
1278kernelrelease:
1279	@echo $(KERNELRELEASE)
1280
1281# FIXME Should go into a make.lib or something
1282# ===========================================================================
1283
1284quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1285      cmd_rmdirs = rm -rf $(rm-dirs)
1286
1287quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1288      cmd_rmfiles = rm -f $(rm-files)
1289
1290
1291a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1292	  $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1293	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1294
1295quiet_cmd_as_o_S = AS      $@
1296cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1297
1298# read all saved command lines
1299
1300targets := $(wildcard $(sort $(targets)))
1301cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1302
1303ifneq ($(cmd_files),)
1304  $(cmd_files): ;	# Do not try to update included dependency files
1305  include $(cmd_files)
1306endif
1307
1308# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1309# Usage:
1310# $(Q)$(MAKE) $(clean)=dir
1311clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1312
1313endif	# skip-makefile
1314
1315FORCE:
1316