xref: /openbmc/linux/Makefile (revision da2014a2)
1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 26
4EXTRAVERSION =
5NAME = Rotary Wombat
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# We are using a recursive build, so we need to do a little thinking
20# to get the ordering right.
21#
22# Most importantly: sub-Makefiles should only ever modify files in
23# their own directory. If in some directory we have a dependency on
24# a file in another dir (which doesn't happen often, but it's often
25# unavoidable when linking the built-in.o targets which finally
26# turn into vmlinux), we will call a sub make in that other dir, and
27# after that we are sure that everything which is in that other dir
28# is now up to date.
29#
30# The only cases where we need to modify files which have global
31# effects are thus separated out and done before the recursive
32# descending is started. They are now explicitly listed as the
33# prepare rule.
34
35# To put more focus on warnings, be less verbose as default
36# Use 'make V=1' to see the full commands
37
38ifdef V
39  ifeq ("$(origin V)", "command line")
40    KBUILD_VERBOSE = $(V)
41  endif
42endif
43ifndef KBUILD_VERBOSE
44  KBUILD_VERBOSE = 0
45endif
46
47# Call a source code checker (by default, "sparse") as part of the
48# C compilation.
49#
50# Use 'make C=1' to enable checking of only re-compiled files.
51# Use 'make C=2' to enable checking of *all* source files, regardless
52# of whether they are re-compiled or not.
53#
54# See the file "Documentation/sparse.txt" for more details, including
55# where to get the "sparse" utility.
56
57ifdef C
58  ifeq ("$(origin C)", "command line")
59    KBUILD_CHECKSRC = $(C)
60  endif
61endif
62ifndef KBUILD_CHECKSRC
63  KBUILD_CHECKSRC = 0
64endif
65
66# Use make M=dir to specify directory of external module to build
67# Old syntax make ... SUBDIRS=$PWD is still supported
68# Setting the environment variable KBUILD_EXTMOD take precedence
69ifdef SUBDIRS
70  KBUILD_EXTMOD ?= $(SUBDIRS)
71endif
72ifdef M
73  ifeq ("$(origin M)", "command line")
74    KBUILD_EXTMOD := $(M)
75  endif
76endif
77
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(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?
101ifdef O
102  ifeq ("$(origin O)", "command line")
103    KBUILD_OUTPUT := $(O)
104  endif
105endif
106
107# That's our default target when none is given on the command line
108PHONY := _all
109_all:
110
111# Cancel implicit rules on top Makefile
112$(CURDIR)/Makefile Makefile: ;
113
114ifneq ($(KBUILD_OUTPUT),)
115# Invoke a second make in the output directory, passing relevant variables
116# check that the output directory actually exists
117saved-output := $(KBUILD_OUTPUT)
118KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119$(if $(KBUILD_OUTPUT),, \
120     $(error output directory "$(saved-output)" does not exist))
121
122PHONY += $(MAKECMDGOALS) sub-make
123
124$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
125	$(Q)@:
126
127sub-make: FORCE
128	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129	KBUILD_SRC=$(CURDIR) \
130	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131	$(filter-out _all sub-make,$(MAKECMDGOALS))
132
133# Leave processing to above invocation of make
134skip-makefile := 1
135endif # ifneq ($(KBUILD_OUTPUT),)
136endif # ifeq ($(KBUILD_SRC),)
137
138# We process the rest of the Makefile if this is the final invocation of make
139ifeq ($(skip-makefile),)
140
141# If building an external module we do not care about the all: rule
142# but instead _all depend on modules
143PHONY += all
144ifeq ($(KBUILD_EXTMOD),)
145_all: all
146else
147_all: modules
148endif
149
150srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
151TOPDIR		:= $(srctree)
152# FIXME - TOPDIR is obsolete, use srctree/objtree
153objtree		:= $(CURDIR)
154src		:= $(srctree)
155obj		:= $(objtree)
156
157VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export srctree objtree VPATH TOPDIR
160
161
162# SUBARCH tells the usermode build what the underlying arch is.  That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below.  If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169				  -e s/arm.*/arm/ -e s/sa110/arm/ \
170				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
171				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172				  -e s/sh.*/sh/ )
173
174# Cross compiling and selecting different set of gcc/bin-utils
175# ---------------------------------------------------------------------------
176#
177# When performing cross compilation for other architectures ARCH shall be set
178# to the target architecture. (See arch/* for the possibilities).
179# ARCH can be set during invocation of make:
180# make ARCH=ia64
181# Another way is to have ARCH set in the environment.
182# The default ARCH is the host where make is executed.
183
184# CROSS_COMPILE specify the prefix used for all executables used
185# during compilation. Only gcc and related bin-utils executables
186# are prefixed with $(CROSS_COMPILE).
187# CROSS_COMPILE can be set on the command line
188# make CROSS_COMPILE=ia64-linux-
189# Alternatively CROSS_COMPILE can be set in the environment.
190# Default value for CROSS_COMPILE is not to prefix executables
191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192export KBUILD_BUILDHOST := $(SUBARCH)
193ARCH		?= $(SUBARCH)
194CROSS_COMPILE	?=
195
196# Architecture as present in compile.h
197UTS_MACHINE 	:= $(ARCH)
198SRCARCH 	:= $(ARCH)
199
200# Additional ARCH settings for x86
201ifeq ($(ARCH),i386)
202        SRCARCH := x86
203endif
204ifeq ($(ARCH),x86_64)
205        SRCARCH := x86
206endif
207
208# Where to locate arch specific headers
209ifeq ($(ARCH),sparc64)
210       hdr-arch  := sparc
211else
212       hdr-arch  := $(SRCARCH)
213endif
214
215KCONFIG_CONFIG	?= .config
216
217# SHELL used by kbuild
218CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
219	  else if [ -x /bin/bash ]; then echo /bin/bash; \
220	  else echo sh; fi ; fi)
221
222HOSTCC       = gcc
223HOSTCXX      = g++
224HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
225HOSTCXXFLAGS = -O2
226
227# Decide whether to build built-in, modular, or both.
228# Normally, just do built-in.
229
230KBUILD_MODULES :=
231KBUILD_BUILTIN := 1
232
233#	If we have only "make modules", don't compile built-in objects.
234#	When we're building modules with modversions, we need to consider
235#	the built-in objects during the descend as well, in order to
236#	make sure the checksums are up to date before we record them.
237
238ifeq ($(MAKECMDGOALS),modules)
239  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
240endif
241
242#	If we have "make <whatever> modules", compile modules
243#	in addition to whatever we do anyway.
244#	Just "make" or "make all" shall build modules as well
245
246ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
247  KBUILD_MODULES := 1
248endif
249
250ifeq ($(MAKECMDGOALS),)
251  KBUILD_MODULES := 1
252endif
253
254export KBUILD_MODULES KBUILD_BUILTIN
255export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
256
257# Beautify output
258# ---------------------------------------------------------------------------
259#
260# Normally, we echo the whole command before executing it. By making
261# that echo $($(quiet)$(cmd)), we now have the possibility to set
262# $(quiet) to choose other forms of output instead, e.g.
263#
264#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
265#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
266#
267# If $(quiet) is empty, the whole command will be printed.
268# If it is set to "quiet_", only the short version will be printed.
269# If it is set to "silent_", nothing will be printed at all, since
270# the variable $(silent_cmd_cc_o_c) doesn't exist.
271#
272# A simple variant is to prefix commands with $(Q) - that's useful
273# for commands that shall be hidden in non-verbose mode.
274#
275#	$(Q)ln $@ :<
276#
277# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
278# If KBUILD_VERBOSE equals 1 then the above command is displayed.
279
280ifeq ($(KBUILD_VERBOSE),1)
281  quiet =
282  Q =
283else
284  quiet=quiet_
285  Q = @
286endif
287
288# If the user is running make -s (silent mode), suppress echoing of
289# commands
290
291ifneq ($(findstring s,$(MAKEFLAGS)),)
292  quiet=silent_
293endif
294
295export quiet Q KBUILD_VERBOSE
296
297
298# Look for make include files relative to root of kernel src
299MAKEFLAGS += --include-dir=$(srctree)
300
301# We need some generic definitions (do not try to remake the file).
302$(srctree)/scripts/Kbuild.include: ;
303include $(srctree)/scripts/Kbuild.include
304
305# Make variables (CC, etc...)
306
307AS		= $(CROSS_COMPILE)as
308LD		= $(CROSS_COMPILE)ld
309CC		= $(CROSS_COMPILE)gcc
310CPP		= $(CC) -E
311AR		= $(CROSS_COMPILE)ar
312NM		= $(CROSS_COMPILE)nm
313STRIP		= $(CROSS_COMPILE)strip
314OBJCOPY		= $(CROSS_COMPILE)objcopy
315OBJDUMP		= $(CROSS_COMPILE)objdump
316AWK		= awk
317GENKSYMS	= scripts/genksyms/genksyms
318DEPMOD		= /sbin/depmod
319KALLSYMS	= scripts/kallsyms
320PERL		= perl
321CHECK		= sparse
322
323CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
324MODFLAGS	= -DMODULE
325CFLAGS_MODULE   = $(MODFLAGS)
326AFLAGS_MODULE   = $(MODFLAGS)
327LDFLAGS_MODULE  =
328CFLAGS_KERNEL	=
329AFLAGS_KERNEL	=
330
331
332# Use LINUXINCLUDE when you must reference the include/ directory.
333# Needed to be compatible with the O= option
334LINUXINCLUDE    := -Iinclude \
335                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
336                   -I$(srctree)/arch/$(hdr-arch)/include               \
337                   -include include/linux/autoconf.h
338
339KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
340
341KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
342		   -fno-strict-aliasing -fno-common \
343		   -Werror-implicit-function-declaration
344KBUILD_AFLAGS   := -D__ASSEMBLY__
345
346# Read KERNELRELEASE from include/config/kernel.release (if it exists)
347KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
348KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
349
350export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
351export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
352export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
353export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
354
355export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
356export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
357export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
358
359# When compiling out-of-tree modules, put MODVERDIR in the module
360# tree rather than in the kernel tree. The kernel tree might
361# even be read-only.
362export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
363
364# Files to ignore in find ... statements
365
366RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
367export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
368
369# ===========================================================================
370# Rules shared between *config targets and build targets
371
372# Basic helpers built in scripts/
373PHONY += scripts_basic
374scripts_basic:
375	$(Q)$(MAKE) $(build)=scripts/basic
376
377# To avoid any implicit rule to kick in, define an empty command.
378scripts/basic/%: scripts_basic ;
379
380PHONY += outputmakefile
381# outputmakefile generates a Makefile in the output directory, if using a
382# separate output directory. This allows convenient use of make in the
383# output directory.
384outputmakefile:
385ifneq ($(KBUILD_SRC),)
386	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
387	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
388endif
389
390# To make sure we do not include .config for any of the *config targets
391# catch them early, and hand them over to scripts/kconfig/Makefile
392# It is allowed to specify more targets when calling make, including
393# mixing *config targets and build targets.
394# For example 'make oldconfig all'.
395# Detect when mixed targets is specified, and make a second invocation
396# of make so .config is not included in this case either (for *config).
397
398no-dot-config-targets := clean mrproper distclean \
399			 cscope TAGS tags help %docs check% \
400			 include/linux/version.h headers_% \
401			 kernelrelease kernelversion
402
403config-targets := 0
404mixed-targets  := 0
405dot-config     := 1
406
407ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
408	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
409		dot-config := 0
410	endif
411endif
412
413ifeq ($(KBUILD_EXTMOD),)
414        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
415                config-targets := 1
416                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
417                        mixed-targets := 1
418                endif
419        endif
420endif
421
422ifeq ($(mixed-targets),1)
423# ===========================================================================
424# We're called with mixed targets (*config and build targets).
425# Handle them one by one.
426
427%:: FORCE
428	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
429
430else
431ifeq ($(config-targets),1)
432# ===========================================================================
433# *config targets only - make sure prerequisites are updated, and descend
434# in scripts/kconfig to make the *config target
435
436# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
437# KBUILD_DEFCONFIG may point out an alternative default configuration
438# used for 'make defconfig'
439include $(srctree)/arch/$(SRCARCH)/Makefile
440export KBUILD_DEFCONFIG
441
442config %config: scripts_basic outputmakefile FORCE
443	$(Q)mkdir -p include/linux include/config
444	$(Q)$(MAKE) $(build)=scripts/kconfig $@
445
446else
447# ===========================================================================
448# Build targets only - this includes vmlinux, arch specific targets, clean
449# targets and others. In general all targets except *config targets.
450
451ifeq ($(KBUILD_EXTMOD),)
452# Additional helpers built in scripts/
453# Carefully list dependencies so we do not try to build scripts twice
454# in parallel
455PHONY += scripts
456scripts: scripts_basic include/config/auto.conf
457	$(Q)$(MAKE) $(build)=$(@)
458
459# Objects we will link into vmlinux / subdirs we need to visit
460init-y		:= init/
461drivers-y	:= drivers/ sound/ firmware/
462net-y		:= net/
463libs-y		:= lib/
464core-y		:= usr/
465endif # KBUILD_EXTMOD
466
467ifeq ($(dot-config),1)
468# Read in config
469-include include/config/auto.conf
470
471ifeq ($(KBUILD_EXTMOD),)
472# Read in dependencies to all Kconfig* files, make sure to run
473# oldconfig if changes are detected.
474-include include/config/auto.conf.cmd
475
476# To avoid any implicit rule to kick in, define an empty command
477$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
478
479# If .config is newer than include/config/auto.conf, someone tinkered
480# with it and forgot to run make oldconfig.
481# if auto.conf.cmd is missing then we are probably in a cleaned tree so
482# we execute the config step to be sure to catch updated Kconfig files
483include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
484	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
485else
486# external modules needs include/linux/autoconf.h and include/config/auto.conf
487# but do not care if they are up-to-date. Use auto.conf to trigger the test
488PHONY += include/config/auto.conf
489
490include/config/auto.conf:
491	$(Q)test -e include/linux/autoconf.h -a -e $@ || (		\
492	echo;								\
493	echo "  ERROR: Kernel configuration is invalid.";		\
494	echo "         include/linux/autoconf.h or $@ are missing.";	\
495	echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
496	echo;								\
497	/bin/false)
498
499endif # KBUILD_EXTMOD
500
501else
502# Dummy target needed, because used as prerequisite
503include/config/auto.conf: ;
504endif # $(dot-config)
505
506# The all: target is the default when no target is given on the
507# command line.
508# This allow a user to issue only 'make' to build a kernel including modules
509# Defaults vmlinux but it is usually overridden in the arch makefile
510all: vmlinux
511
512ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
513KBUILD_CFLAGS	+= -Os
514else
515KBUILD_CFLAGS	+= -O2
516endif
517
518include $(srctree)/arch/$(SRCARCH)/Makefile
519
520ifneq (CONFIG_FRAME_WARN,0)
521KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
522endif
523
524# Force gcc to behave correct even for buggy distributions
525# Arch Makefiles may override this setting
526KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
527
528ifdef CONFIG_FRAME_POINTER
529KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
530else
531KBUILD_CFLAGS	+= -fomit-frame-pointer
532endif
533
534ifdef CONFIG_DEBUG_INFO
535KBUILD_CFLAGS	+= -g
536KBUILD_AFLAGS	+= -gdwarf-2
537endif
538
539ifdef CONFIG_FTRACE
540KBUILD_CFLAGS	+= -pg
541endif
542
543# We trigger additional mismatches with less inlining
544ifdef CONFIG_DEBUG_SECTION_MISMATCH
545KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
546endif
547
548# arch Makefile may override CC so keep this after arch Makefile is included
549NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
550CHECKFLAGS     += $(NOSTDINC_FLAGS)
551
552# warn about C99 declaration after statement
553KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
554
555# disable pointer signed / unsigned warnings in gcc 4.0
556KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
557
558# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
559# But warn user when we do so
560warn-assign = \
561$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
562
563ifneq ($(KCPPFLAGS),)
564        $(call warn-assign,CPPFLAGS)
565        KBUILD_CPPFLAGS += $(KCPPFLAGS)
566endif
567ifneq ($(KAFLAGS),)
568        $(call warn-assign,AFLAGS)
569        KBUILD_AFLAGS += $(KAFLAGS)
570endif
571ifneq ($(KCFLAGS),)
572        $(call warn-assign,CFLAGS)
573        KBUILD_CFLAGS += $(KCFLAGS)
574endif
575
576# Use --build-id when available.
577LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
578			      $(call ld-option, -Wl$(comma)--build-id,))
579LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
580LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
581
582# Default kernel image to build when no specific target is given.
583# KBUILD_IMAGE may be overruled on the command line or
584# set in the environment
585# Also any assignments in arch/$(ARCH)/Makefile take precedence over
586# this default value
587export KBUILD_IMAGE ?= vmlinux
588
589#
590# INSTALL_PATH specifies where to place the updated kernel and system map
591# images. Default is /boot, but you can set it to other values
592export	INSTALL_PATH ?= /boot
593
594#
595# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
596# relocations required by build roots.  This is not defined in the
597# makefile but the argument can be passed to make if needed.
598#
599
600MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
601export MODLIB
602
603#
604#  INSTALL_MOD_STRIP, if defined, will cause modules to be
605#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
606#  the default option --strip-debug will be used.  Otherwise,
607#  INSTALL_MOD_STRIP will used as the options to the strip command.
608
609ifdef INSTALL_MOD_STRIP
610ifeq ($(INSTALL_MOD_STRIP),1)
611mod_strip_cmd = $(STRIP) --strip-debug
612else
613mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
614endif # INSTALL_MOD_STRIP=1
615else
616mod_strip_cmd = true
617endif # INSTALL_MOD_STRIP
618export mod_strip_cmd
619
620
621ifeq ($(KBUILD_EXTMOD),)
622core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
623
624vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
625		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
626		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
627
628vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
629		     $(init-n) $(init-) \
630		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
631		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
632
633init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
634core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
635drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
636net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
637libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
638libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
639libs-y		:= $(libs-y1) $(libs-y2)
640
641# Build vmlinux
642# ---------------------------------------------------------------------------
643# vmlinux is built from the objects selected by $(vmlinux-init) and
644# $(vmlinux-main). Most are built-in.o files from top-level directories
645# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
646# Ordering when linking is important, and $(vmlinux-init) must be first.
647#
648# vmlinux
649#   ^
650#   |
651#   +-< $(vmlinux-init)
652#   |   +--< init/version.o + more
653#   |
654#   +--< $(vmlinux-main)
655#   |    +--< driver/built-in.o mm/built-in.o + more
656#   |
657#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
658#
659# vmlinux version (uname -v) cannot be updated during normal
660# descending-into-subdirs phase since we do not yet know if we need to
661# update vmlinux.
662# Therefore this step is delayed until just before final link of vmlinux -
663# except in the kallsyms case where it is done just before adding the
664# symbols to the kernel.
665#
666# System.map is generated to document addresses of all kernel symbols
667
668vmlinux-init := $(head-y) $(init-y)
669vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
670vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
671vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
672export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
673
674# Rule to link vmlinux - also used during CONFIG_KALLSYMS
675# May be overridden by arch/$(ARCH)/Makefile
676quiet_cmd_vmlinux__ ?= LD      $@
677      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
678      -T $(vmlinux-lds) $(vmlinux-init)                          \
679      --start-group $(vmlinux-main) --end-group                  \
680      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
681
682# Generate new vmlinux version
683quiet_cmd_vmlinux_version = GEN     .version
684      cmd_vmlinux_version = set -e;                     \
685	if [ ! -r .version ]; then			\
686	  rm -f .version;				\
687	  echo 1 >.version;				\
688	else						\
689	  mv .version .old_version;			\
690	  expr 0$$(cat .old_version) + 1 >.version;	\
691	fi;						\
692	$(MAKE) $(build)=init
693
694# Generate System.map
695quiet_cmd_sysmap = SYSMAP
696      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
697
698# Link of vmlinux
699# If CONFIG_KALLSYMS is set .version is already updated
700# Generate System.map and verify that the content is consistent
701# Use + in front of the vmlinux_version rule to silent warning with make -j2
702# First command is ':' to allow us to use + in front of the rule
703define rule_vmlinux__
704	:
705	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
706
707	$(call cmd,vmlinux__)
708	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
709
710	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
711	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
712	$(cmd_sysmap) $@ System.map;                                         \
713	if [ $$? -ne 0 ]; then                                               \
714		rm -f $@;                                                    \
715		/bin/false;                                                  \
716	fi;
717	$(verify_kallsyms)
718endef
719
720
721ifdef CONFIG_KALLSYMS
722# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
723# It's a three stage process:
724# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
725#   empty
726#   Running kallsyms on that gives us .tmp_kallsyms1.o with
727#   the right size - vmlinux version (uname -v) is updated during this step
728# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
729#   but due to the added section, some addresses have shifted.
730#   From here, we generate a correct .tmp_kallsyms2.o
731# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
732# o Verify that the System.map from vmlinux matches the map from
733#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
734# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
735#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
736#   temporary bypass to allow the kernel to be built while the
737#   maintainers work out what went wrong with kallsyms.
738
739ifdef CONFIG_KALLSYMS_EXTRA_PASS
740last_kallsyms := 3
741else
742last_kallsyms := 2
743endif
744
745kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
746
747define verify_kallsyms
748	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
749	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
750	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
751	$(Q)cmp -s System.map .tmp_System.map ||                             \
752		(echo Inconsistent kallsyms data;                            \
753		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
754		 rm .tmp_kallsyms* ; /bin/false )
755endef
756
757# Update vmlinux version before link
758# Use + in front of this rule to silent warning about make -j1
759# First command is ':' to allow us to use + in front of this rule
760cmd_ksym_ld = $(cmd_vmlinux__)
761define rule_ksym_ld
762	:
763	+$(call cmd,vmlinux_version)
764	$(call cmd,vmlinux__)
765	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
766endef
767
768# Generate .S file with all kernel symbols
769quiet_cmd_kallsyms = KSYM    $@
770      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
771                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
772
773.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
774	$(call if_changed_dep,as_o_S)
775
776.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
777	$(call cmd,kallsyms)
778
779# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
780.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
781	$(call if_changed_rule,ksym_ld)
782
783.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
784	$(call if_changed,vmlinux__)
785
786.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
787	$(call if_changed,vmlinux__)
788
789# Needs to visit scripts/ before $(KALLSYMS) can be used.
790$(KALLSYMS): scripts ;
791
792# Generate some data for debugging strange kallsyms problems
793debug_kallsyms: .tmp_map$(last_kallsyms)
794
795.tmp_map%: .tmp_vmlinux% FORCE
796	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
797
798.tmp_map3: .tmp_map2
799
800.tmp_map2: .tmp_map1
801
802endif # ifdef CONFIG_KALLSYMS
803
804# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
805# relevant sections renamed as per the linker script.
806quiet_cmd_vmlinux-modpost = LD      $@
807      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
808	 $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
809	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
810define rule_vmlinux-modpost
811	:
812	+$(call cmd,vmlinux-modpost)
813	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
814	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
815endef
816
817# vmlinux image - including updated kernel symbols
818vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
819ifdef CONFIG_HEADERS_CHECK
820	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
821endif
822ifdef CONFIG_SAMPLES
823	$(Q)$(MAKE) $(build)=samples
824endif
825	$(call vmlinux-modpost)
826	$(call if_changed_rule,vmlinux__)
827	$(Q)rm -f .old_version
828
829# build vmlinux.o first to catch section mismatch errors early
830ifdef CONFIG_KALLSYMS
831.tmp_vmlinux1: vmlinux.o
832endif
833
834modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
835vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
836	$(call if_changed_rule,vmlinux-modpost)
837
838# The actual objects are generated when descending,
839# make sure no implicit rule kicks in
840$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
841
842# Handle descending into subdirectories listed in $(vmlinux-dirs)
843# Preset locale variables to speed up the build process. Limit locale
844# tweaks to this spot to avoid wrong language settings when running
845# make menuconfig etc.
846# Error messages still appears in the original language
847
848PHONY += $(vmlinux-dirs)
849$(vmlinux-dirs): prepare scripts
850	$(Q)$(MAKE) $(build)=$@
851
852# Build the kernel release string
853#
854# The KERNELRELEASE value built here is stored in the file
855# include/config/kernel.release, and is used when executing several
856# make targets, such as "make install" or "make modules_install."
857#
858# The eventual kernel release string consists of the following fields,
859# shown in a hierarchical format to show how smaller parts are concatenated
860# to form the larger and final value, with values coming from places like
861# the Makefile, kernel config options, make command line options and/or
862# SCM tag information.
863#
864#	$(KERNELVERSION)
865#	  $(VERSION)			eg, 2
866#	  $(PATCHLEVEL)			eg, 6
867#	  $(SUBLEVEL)			eg, 18
868#	  $(EXTRAVERSION)		eg, -rc6
869#	$(localver-full)
870#	  $(localver)
871#	    localversion*		(files without backups, containing '~')
872#	    $(CONFIG_LOCALVERSION)	(from kernel config setting)
873#	  $(localver-auto)		(only if CONFIG_LOCALVERSION_AUTO is set)
874#	    ./scripts/setlocalversion	(SCM tag, if one exists)
875#	    $(LOCALVERSION)		(from make command line if provided)
876#
877#  Note how the final $(localver-auto) string is included *only* if the
878# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
879# moment, only git is supported but other SCMs can edit the script
880# scripts/setlocalversion and add the appropriate checks as needed.
881
882pattern = ".*/localversion[^~]*"
883string  = $(shell cat /dev/null \
884	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
885
886localver = $(subst $(space),, $(string) \
887			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
888
889# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
890# and if the SCM is know a tag from the SCM is appended.
891# The appended tag is determined by the SCM used.
892#
893# Currently, only git is supported.
894# Other SCMs can edit scripts/setlocalversion and add the appropriate
895# checks as needed.
896ifdef CONFIG_LOCALVERSION_AUTO
897	_localver-auto = $(shell $(CONFIG_SHELL) \
898	                  $(srctree)/scripts/setlocalversion $(srctree))
899	localver-auto  = $(LOCALVERSION)$(_localver-auto)
900endif
901
902localver-full = $(localver)$(localver-auto)
903
904# Store (new) KERNELRELASE string in include/config/kernel.release
905kernelrelease = $(KERNELVERSION)$(localver-full)
906include/config/kernel.release: include/config/auto.conf FORCE
907	$(Q)rm -f $@
908	$(Q)echo $(kernelrelease) > $@
909
910
911# Things we need to do before we recursively start building the kernel
912# or the modules are listed in "prepare".
913# A multi level approach is used. prepareN is processed before prepareN-1.
914# archprepare is used in arch Makefiles and when processed asm symlink,
915# version.h and scripts_basic is processed / created.
916
917# Listed in dependency order
918PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
919
920# prepare3 is used to check if we are building in a separate output directory,
921# and if so do:
922# 1) Check that make has not been executed in the kernel src $(srctree)
923# 2) Create the include2 directory, used for the second asm symlink
924prepare3: include/config/kernel.release
925ifneq ($(KBUILD_SRC),)
926	@echo '  Using $(srctree) as source for kernel'
927	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
928		echo "  $(srctree) is not clean, please run 'make mrproper'";\
929		echo "  in the '$(srctree)' directory.";\
930		/bin/false; \
931	fi;
932	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
933	$(Q)if [ -e $(srctree)/include/asm-$(SRCARCH)/system.h ]; then  \
934	    ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
935	    fi
936endif
937
938# prepare2 creates a makefile if using a separate output directory
939prepare2: prepare3 outputmakefile
940
941prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
942                   include/asm include/config/auto.conf
943	$(cmd_crmodverdir)
944
945archprepare: prepare1 scripts_basic
946
947prepare0: archprepare FORCE
948	$(Q)$(MAKE) $(build)=.
949	$(Q)$(MAKE) $(build)=. missing-syscalls
950
951# All the preparing..
952prepare: prepare0
953
954# Leave this as default for preprocessing vmlinux.lds.S, which is now
955# done in arch/$(ARCH)/kernel/Makefile
956
957export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
958
959# The asm symlink changes when $(ARCH) changes.
960# Detect this and ask user to run make mrproper
961define check-symlink
962	set -e;                                                            \
963	if [ -L include/asm ]; then                                        \
964		asmlink=`readlink include/asm | cut -d '-' -f 2`;          \
965		if [ "$$asmlink" != "$(SRCARCH)" ]; then                   \
966			echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
967			echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
968			exit 1;                                            \
969		fi;                                                        \
970	fi
971endef
972
973# We create the target directory of the symlink if it does
974# not exist so the test in chack-symlink works and we have a
975# directory for generated filesas used by some architectures.
976define create-symlink
977	if [ ! -L include/asm ]; then                                      \
978			echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';     \
979			if [ ! -d include/asm-$(SRCARCH) ]; then           \
980				mkdir -p include/asm-$(SRCARCH);           \
981			fi;                                                \
982			ln -fsn asm-$(SRCARCH) $@;                         \
983	fi
984endef
985
986include/asm: FORCE
987	$(Q)$(check-symlink)
988	$(Q)$(create-symlink)
989
990# Generate some files
991# ---------------------------------------------------------------------------
992
993# KERNELRELEASE can change from a few different places, meaning version.h
994# needs to be updated, so this check is forced on all builds
995
996uts_len := 64
997define filechk_utsrelease.h
998	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
999	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1000	  exit 1;                                                         \
1001	fi;                                                               \
1002	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1003endef
1004
1005define filechk_version.h
1006	(echo \#define LINUX_VERSION_CODE $(shell                             \
1007	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
1008	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1009endef
1010
1011include/linux/version.h: $(srctree)/Makefile FORCE
1012	$(call filechk,version.h)
1013
1014include/linux/utsrelease.h: include/config/kernel.release FORCE
1015	$(call filechk,utsrelease.h)
1016
1017# ---------------------------------------------------------------------------
1018
1019PHONY += depend dep
1020depend dep:
1021	@echo '*** Warning: make $@ is unnecessary now.'
1022
1023# ---------------------------------------------------------------------------
1024# Firmware install
1025INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1026export INSTALL_FW_PATH
1027
1028PHONY += firmware_install
1029firmware_install: FORCE
1030	@mkdir -p $(objtree)/firmware
1031	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032
1033# ---------------------------------------------------------------------------
1034# Kernel headers
1035
1036#Default location for installed headers
1037export INSTALL_HDR_PATH = $(objtree)/usr
1038
1039hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040# Find out where the Kbuild file is located to support
1041# arch/$(ARCH)/include/asm
1042hdr-dir = $(strip                                                         \
1043          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1044               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1045
1046# If we do an all arch process set dst to asm-$(hdr-arch)
1047hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1048
1049PHONY += __headers
1050__headers: include/linux/version.h scripts_basic FORCE
1051	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1052
1053PHONY += headers_install_all
1054headers_install_all:
1055	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1056
1057PHONY += headers_install
1058headers_install: __headers
1059	$(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1060	$(error Headers not exportable for the $(SRCARCH) architecture))
1061	$(Q)$(MAKE) $(hdr-inst)=include
1062	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1063
1064PHONY += headers_check_all
1065headers_check_all: headers_install_all
1066	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1067
1068PHONY += headers_check
1069headers_check: headers_install
1070	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1071	$(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1072
1073# ---------------------------------------------------------------------------
1074# Modules
1075
1076ifdef CONFIG_MODULES
1077
1078# By default, build modules as well
1079
1080all: modules
1081
1082#	Build modules
1083#
1084#	A module can be listed more than once in obj-m resulting in
1085#	duplicate lines in modules.order files.  Those are removed
1086#	using awk while concatenating to the final file.
1087
1088PHONY += modules
1089modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1090	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1091	@echo '  Building modules, stage 2.';
1092	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1093	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1094
1095
1096# Target to prepare building external modules
1097PHONY += modules_prepare
1098modules_prepare: prepare scripts
1099
1100# Target to install modules
1101PHONY += modules_install
1102modules_install: _modinst_ _modinst_post
1103
1104PHONY += _modinst_
1105_modinst_:
1106	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1107		echo "Warning: you may need to install module-init-tools"; \
1108		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1109		sleep 1; \
1110	fi
1111	@rm -rf $(MODLIB)/kernel
1112	@rm -f $(MODLIB)/source
1113	@mkdir -p $(MODLIB)/kernel
1114	@ln -s $(srctree) $(MODLIB)/source
1115	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1116		rm -f $(MODLIB)/build ; \
1117		ln -s $(objtree) $(MODLIB)/build ; \
1118	fi
1119	@cp -f $(objtree)/modules.order $(MODLIB)/
1120	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1121
1122# This depmod is only for convenience to give the initial
1123# boot a modules.dep even before / is mounted read-write.  However the
1124# boot script depmod is the master version.
1125PHONY += _modinst_post
1126_modinst_post: _modinst_
1127	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1128	$(call cmd,depmod)
1129
1130else # CONFIG_MODULES
1131
1132# Modules not configured
1133# ---------------------------------------------------------------------------
1134
1135modules modules_install: FORCE
1136	@echo
1137	@echo "The present kernel configuration has modules disabled."
1138	@echo "Type 'make config' and enable loadable module support."
1139	@echo "Then build a kernel with module support enabled."
1140	@echo
1141	@exit 1
1142
1143endif # CONFIG_MODULES
1144
1145###
1146# Cleaning is done on three levels.
1147# make clean     Delete most generated files
1148#                Leave enough to build external modules
1149# make mrproper  Delete the current configuration, and all generated files
1150# make distclean Remove editor backup files, patch leftover files and the like
1151
1152# Directories & files removed with 'make clean'
1153CLEAN_DIRS  += $(MODVERDIR)
1154CLEAN_FILES +=	vmlinux System.map \
1155                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1156
1157# Directories & files removed with 'make mrproper'
1158MRPROPER_DIRS  += include/config include2 usr/include
1159MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1160                  include/linux/autoconf.h include/linux/version.h      \
1161                  include/linux/utsrelease.h                            \
1162                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1163		  Module.symvers Module.markers tags TAGS cscope*
1164
1165# clean - Delete most, but leave enough to build external modules
1166#
1167clean: rm-dirs  := $(CLEAN_DIRS)
1168clean: rm-files := $(CLEAN_FILES)
1169clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1170
1171PHONY += $(clean-dirs) clean archclean
1172$(clean-dirs):
1173	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1174
1175clean: archclean $(clean-dirs)
1176	$(call cmd,rmdirs)
1177	$(call cmd,rmfiles)
1178	@find . $(RCS_FIND_IGNORE) \
1179		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1180		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1181		-o -name '*.symtypes' -o -name 'modules.order' \
1182		-o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1183		-type f -print | xargs rm -f
1184
1185# mrproper - Delete all generated files, including .config
1186#
1187mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1188mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1189mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1190
1191PHONY += $(mrproper-dirs) mrproper archmrproper
1192$(mrproper-dirs):
1193	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1194
1195mrproper: clean archmrproper $(mrproper-dirs)
1196	$(call cmd,rmdirs)
1197	$(call cmd,rmfiles)
1198
1199# distclean
1200#
1201PHONY += distclean
1202
1203distclean: mrproper
1204	@find $(srctree) $(RCS_FIND_IGNORE) \
1205		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1206		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1207		-o -name '.*.rej' -o -size 0 \
1208		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1209		-type f -print | xargs rm -f
1210
1211
1212# Packaging of the kernel to various formats
1213# ---------------------------------------------------------------------------
1214# rpm target kept for backward compatibility
1215package-dir	:= $(srctree)/scripts/package
1216
1217%pkg: include/config/kernel.release FORCE
1218	$(Q)$(MAKE) $(build)=$(package-dir) $@
1219rpm: include/config/kernel.release FORCE
1220	$(Q)$(MAKE) $(build)=$(package-dir) $@
1221
1222
1223# Brief documentation of the typical targets used
1224# ---------------------------------------------------------------------------
1225
1226boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1227boards := $(notdir $(boards))
1228board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1229board-dirs := $(sort $(notdir $(board-dirs:/=)))
1230
1231help:
1232	@echo  'Cleaning targets:'
1233	@echo  '  clean		  - Remove most generated files but keep the config and'
1234	@echo  '                    enough build support to build external modules'
1235	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1236	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1237	@echo  ''
1238	@echo  'Configuration targets:'
1239	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1240	@echo  ''
1241	@echo  'Other generic targets:'
1242	@echo  '  all		  - Build all targets marked with [*]'
1243	@echo  '* vmlinux	  - Build the bare kernel'
1244	@echo  '* modules	  - Build all modules'
1245	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1246	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1247	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1248	@echo  '  dir/            - Build all files in dir and below'
1249	@echo  '  dir/file.[ois]  - Build specified target only'
1250	@echo  '  dir/file.ko     - Build module including final link'
1251	@echo  '  prepare         - Set up for building external modules'
1252	@echo  '  tags/TAGS	  - Generate tags file for editors'
1253	@echo  '  cscope	  - Generate cscope index'
1254	@echo  '  kernelrelease	  - Output the release version string'
1255	@echo  '  kernelversion	  - Output the version stored in Makefile'
1256	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1257	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1258	 echo  ''
1259	@echo  'Static analysers'
1260	@echo  '  checkstack      - Generate a list of stack hogs'
1261	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1262	@echo  '  versioncheck    - Sanity check on version.h usage'
1263	@echo  '  includecheck    - Check for duplicate included header files'
1264	@echo  '  export_report   - List the usages of all exported symbols'
1265	@echo  '  headers_check   - Sanity check on exported headers'; \
1266	 echo  ''
1267	@echo  'Kernel packaging:'
1268	@$(MAKE) $(build)=$(package-dir) help
1269	@echo  ''
1270	@echo  'Documentation targets:'
1271	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1272	@echo  ''
1273	@echo  'Architecture specific targets ($(SRCARCH)):'
1274	@$(if $(archhelp),$(archhelp),\
1275		echo '  No architecture specific help defined for $(SRCARCH)')
1276	@echo  ''
1277	@$(if $(boards), \
1278		$(foreach b, $(boards), \
1279		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1280		echo '')
1281	@$(if $(board-dirs), \
1282		$(foreach b, $(board-dirs), \
1283		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1284		printf "  %-16s - Show all of the above\\n" help-boards; \
1285		echo '')
1286
1287	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1288	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1289	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1290	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1291	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1292	@echo  ''
1293	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1294	@echo  'For further info see the ./README file'
1295
1296
1297help-board-dirs := $(addprefix help-,$(board-dirs))
1298
1299help-boards: $(help-board-dirs)
1300
1301boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1302
1303$(help-board-dirs): help-%:
1304	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1305	@$(if $(boards-per-dir), \
1306		$(foreach b, $(boards-per-dir), \
1307		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1308		echo '')
1309
1310
1311# Documentation targets
1312# ---------------------------------------------------------------------------
1313%docs: scripts_basic FORCE
1314	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1315
1316else # KBUILD_EXTMOD
1317
1318###
1319# External module support.
1320# When building external modules the kernel used as basis is considered
1321# read-only, and no consistency checks are made and the make
1322# system is not used on the basis kernel. If updates are required
1323# in the basis kernel ordinary make commands (without M=...) must
1324# be used.
1325#
1326# The following are the only valid targets when building external
1327# modules.
1328# make M=dir clean     Delete all automatically generated files
1329# make M=dir modules   Make all modules in specified dir
1330# make M=dir	       Same as 'make M=dir modules'
1331# make M=dir modules_install
1332#                      Install the modules built in the module directory
1333#                      Assumes install directory is already created
1334
1335# We are always building modules
1336KBUILD_MODULES := 1
1337PHONY += crmodverdir
1338crmodverdir:
1339	$(cmd_crmodverdir)
1340
1341PHONY += $(objtree)/Module.symvers
1342$(objtree)/Module.symvers:
1343	@test -e $(objtree)/Module.symvers || ( \
1344	echo; \
1345	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1346	echo "           is missing; modules will have no dependencies and modversions."; \
1347	echo )
1348
1349module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1350PHONY += $(module-dirs) modules
1351$(module-dirs): crmodverdir $(objtree)/Module.symvers
1352	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1353
1354modules: $(module-dirs)
1355	@echo '  Building modules, stage 2.';
1356	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1357
1358PHONY += modules_install
1359modules_install: _emodinst_ _emodinst_post
1360
1361install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1362PHONY += _emodinst_
1363_emodinst_:
1364	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1365	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1366
1367PHONY += _emodinst_post
1368_emodinst_post: _emodinst_
1369	$(call cmd,depmod)
1370
1371clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1372
1373PHONY += $(clean-dirs) clean
1374$(clean-dirs):
1375	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1376
1377clean:	rm-dirs := $(MODVERDIR)
1378clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1379clean: $(clean-dirs)
1380	$(call cmd,rmdirs)
1381	$(call cmd,rmfiles)
1382	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1383		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1384		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1385		-type f -print | xargs rm -f
1386
1387help:
1388	@echo  '  Building external modules.'
1389	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1390	@echo  ''
1391	@echo  '  modules         - default target, build the module(s)'
1392	@echo  '  modules_install - install the module'
1393	@echo  '  clean           - remove generated files in module directory only'
1394	@echo  ''
1395
1396# Dummies...
1397PHONY += prepare scripts
1398prepare: ;
1399scripts: ;
1400endif # KBUILD_EXTMOD
1401
1402# Generate tags for editors
1403# ---------------------------------------------------------------------------
1404
1405#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1406#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1407#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1408
1409ifeq ($(src),$(obj))
1410__srctree =
1411else
1412__srctree = $(srctree)/
1413endif
1414
1415ifeq ($(ALLSOURCE_ARCHS),)
1416ifeq ($(ARCH),um)
1417ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1418else
1419ALLINCLUDE_ARCHS := $(SRCARCH)
1420endif
1421else
1422#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1423ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1424endif
1425
1426ALLSOURCE_ARCHS := $(SRCARCH)
1427
1428define find-sources
1429        ( for arch in $(ALLSOURCE_ARCHS) ; do \
1430	       find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1431	            -name $1 -print; \
1432	  done ; \
1433	  find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1434	       -name $1 -print; \
1435	  find $(__srctree)include $(RCS_FIND_IGNORE) \
1436	       \( -name config -o -name 'asm-*' \) -prune \
1437	       -o -name $1 -print; \
1438	  for arch in $(ALLINCLUDE_ARCHS) ; do \
1439	       test -e $(__srctree)include/asm-$${arch} && \
1440                 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1441	            -name $1 -print; \
1442	       test -e $(__srctree)arch/$${arch}/include/asm && \
1443	         find $(__srctree)arch/$${arch}/include/asm $(RCS_FIND_IGNORE) \
1444	            -name $1 -print; \
1445	  done ; \
1446	  find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1447	       -name $1 -print; \
1448	  find $(__srctree) $(RCS_FIND_IGNORE) \
1449	       \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1450	       -name $1 -print; \
1451	  )
1452endef
1453
1454define all-sources
1455	$(call find-sources,'*.[chS]')
1456endef
1457define all-kconfigs
1458	$(call find-sources,'Kconfig*')
1459endef
1460define all-defconfigs
1461	$(call find-sources,'defconfig')
1462endef
1463
1464define xtags
1465	if $1 --version 2>&1 | grep -iq exuberant; then \
1466	    $(all-sources) | xargs $1 -a \
1467		-I __initdata,__exitdata,__acquires,__releases \
1468		-I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1469		-I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1470		--extra=+f --c-kinds=+px \
1471		--regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1472	    $(all-kconfigs) | xargs $1 -a \
1473		--langdef=kconfig \
1474		--language-force=kconfig \
1475		--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1476	    $(all-defconfigs) | xargs -r $1 -a \
1477		--langdef=dotconfig \
1478		--language-force=dotconfig \
1479		--regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1480	elif $1 --version 2>&1 | grep -iq emacs; then \
1481	    $(all-sources) | xargs $1 -a; \
1482	    $(all-kconfigs) | xargs $1 -a \
1483		--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1484	    $(all-defconfigs) | xargs -r $1 -a \
1485		--regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1486	else \
1487	    $(all-sources) | xargs $1 -a; \
1488	fi
1489endef
1490
1491quiet_cmd_cscope-file = FILELST cscope.files
1492      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1493
1494quiet_cmd_cscope = MAKE    cscope.out
1495      cmd_cscope = cscope -b
1496
1497cscope: FORCE
1498	$(call cmd,cscope-file)
1499	$(call cmd,cscope)
1500
1501quiet_cmd_TAGS = MAKE   $@
1502define cmd_TAGS
1503	rm -f $@; \
1504	$(call xtags,etags)
1505endef
1506
1507TAGS: FORCE
1508	$(call cmd,TAGS)
1509
1510quiet_cmd_tags = MAKE   $@
1511define cmd_tags
1512	rm -f $@; \
1513	$(call xtags,ctags)
1514endef
1515
1516tags: FORCE
1517	$(call cmd,tags)
1518
1519
1520# Scripts to check various things for consistency
1521# ---------------------------------------------------------------------------
1522
1523includecheck:
1524	find * $(RCS_FIND_IGNORE) \
1525		-name '*.[hcS]' -type f -print | sort \
1526		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1527
1528versioncheck:
1529	find * $(RCS_FIND_IGNORE) \
1530		-name '*.[hcS]' -type f -print | sort \
1531		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1532
1533namespacecheck:
1534	$(PERL) $(srctree)/scripts/namespace.pl
1535
1536export_report:
1537	$(PERL) $(srctree)/scripts/export_report.pl
1538
1539endif #ifeq ($(config-targets),1)
1540endif #ifeq ($(mixed-targets),1)
1541
1542PHONY += checkstack kernelrelease kernelversion
1543
1544# UML needs a little special treatment here.  It wants to use the host
1545# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1546# else wants $(ARCH), including people doing cross-builds, which means
1547# that $(SUBARCH) doesn't work here.
1548ifeq ($(ARCH), um)
1549CHECKSTACK_ARCH := $(SUBARCH)
1550else
1551CHECKSTACK_ARCH := $(ARCH)
1552endif
1553checkstack:
1554	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1555	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1556
1557kernelrelease:
1558	$(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1559	$(error kernelrelease not valid - run 'make prepare' to update it))
1560kernelversion:
1561	@echo $(KERNELVERSION)
1562
1563# Single targets
1564# ---------------------------------------------------------------------------
1565# Single targets are compatible with:
1566# - build with mixed source and output
1567# - build with separate output dir 'make O=...'
1568# - external modules
1569#
1570#  target-dir => where to store outputfile
1571#  build-dir  => directory in kernel source tree to use
1572
1573ifeq ($(KBUILD_EXTMOD),)
1574        build-dir  = $(patsubst %/,%,$(dir $@))
1575        target-dir = $(dir $@)
1576else
1577        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1578        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1579        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1580endif
1581
1582%.s: %.c prepare scripts FORCE
1583	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1584%.i: %.c prepare scripts FORCE
1585	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1586%.o: %.c prepare scripts FORCE
1587	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1588%.lst: %.c prepare scripts FORCE
1589	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1590%.s: %.S prepare scripts FORCE
1591	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1592%.o: %.S prepare scripts FORCE
1593	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1594%.symtypes: %.c prepare scripts FORCE
1595	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1596
1597# Modules
1598/ %/: prepare scripts FORCE
1599	$(cmd_crmodverdir)
1600	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1601	$(build)=$(build-dir)
1602%.ko: prepare scripts FORCE
1603	$(cmd_crmodverdir)
1604	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1605	$(build)=$(build-dir) $(@:.ko=.o)
1606	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1607
1608# FIXME Should go into a make.lib or something
1609# ===========================================================================
1610
1611quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1612      cmd_rmdirs = rm -rf $(rm-dirs)
1613
1614quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1615      cmd_rmfiles = rm -f $(rm-files)
1616
1617# Run depmod only if we have System.map and depmod is executable
1618quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1619      cmd_depmod = \
1620	if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1621		$(DEPMOD) -ae -F System.map                                     \
1622		$(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1623		$(KERNELRELEASE);                                               \
1624	fi
1625
1626# Create temporary dir for module support files
1627# clean it up only when building all modules
1628cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1629                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1630
1631a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1632	  $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1633	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1634
1635quiet_cmd_as_o_S = AS      $@
1636cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1637
1638# read all saved command lines
1639
1640targets := $(wildcard $(sort $(targets)))
1641cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1642
1643ifneq ($(cmd_files),)
1644  $(cmd_files): ;	# Do not try to update included dependency files
1645  include $(cmd_files)
1646endif
1647
1648# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1649# Usage:
1650# $(Q)$(MAKE) $(clean)=dir
1651clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1652
1653endif	# skip-makefile
1654
1655PHONY += FORCE
1656FORCE:
1657
1658# Declare the contents of the .PHONY variable as phony.  We keep that
1659# information in a variable se we can use it in if_changed and friends.
1660.PHONY: $(PHONY)
1661