xref: /openbmc/linux/Makefile (revision 22246614)
1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 26
4EXTRAVERSION = -rc2
5NAME = Funky Weasel is Jiggy wit it
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
208KCONFIG_CONFIG	?= .config
209
210# SHELL used by kbuild
211CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
212	  else if [ -x /bin/bash ]; then echo /bin/bash; \
213	  else echo sh; fi ; fi)
214
215HOSTCC       = gcc
216HOSTCXX      = g++
217HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
218HOSTCXXFLAGS = -O2
219
220# Decide whether to build built-in, modular, or both.
221# Normally, just do built-in.
222
223KBUILD_MODULES :=
224KBUILD_BUILTIN := 1
225
226#	If we have only "make modules", don't compile built-in objects.
227#	When we're building modules with modversions, we need to consider
228#	the built-in objects during the descend as well, in order to
229#	make sure the checksums are up to date before we record them.
230
231ifeq ($(MAKECMDGOALS),modules)
232  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
233endif
234
235#	If we have "make <whatever> modules", compile modules
236#	in addition to whatever we do anyway.
237#	Just "make" or "make all" shall build modules as well
238
239ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
240  KBUILD_MODULES := 1
241endif
242
243ifeq ($(MAKECMDGOALS),)
244  KBUILD_MODULES := 1
245endif
246
247export KBUILD_MODULES KBUILD_BUILTIN
248export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
249
250# Beautify output
251# ---------------------------------------------------------------------------
252#
253# Normally, we echo the whole command before executing it. By making
254# that echo $($(quiet)$(cmd)), we now have the possibility to set
255# $(quiet) to choose other forms of output instead, e.g.
256#
257#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
258#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
259#
260# If $(quiet) is empty, the whole command will be printed.
261# If it is set to "quiet_", only the short version will be printed.
262# If it is set to "silent_", nothing will be printed at all, since
263# the variable $(silent_cmd_cc_o_c) doesn't exist.
264#
265# A simple variant is to prefix commands with $(Q) - that's useful
266# for commands that shall be hidden in non-verbose mode.
267#
268#	$(Q)ln $@ :<
269#
270# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
271# If KBUILD_VERBOSE equals 1 then the above command is displayed.
272
273ifeq ($(KBUILD_VERBOSE),1)
274  quiet =
275  Q =
276else
277  quiet=quiet_
278  Q = @
279endif
280
281# If the user is running make -s (silent mode), suppress echoing of
282# commands
283
284ifneq ($(findstring s,$(MAKEFLAGS)),)
285  quiet=silent_
286endif
287
288export quiet Q KBUILD_VERBOSE
289
290
291# Look for make include files relative to root of kernel src
292MAKEFLAGS += --include-dir=$(srctree)
293
294# We need some generic definitions (do not try to remake the file).
295$(srctree)/scripts/Kbuild.include: ;
296include $(srctree)/scripts/Kbuild.include
297
298# Make variables (CC, etc...)
299
300AS		= $(CROSS_COMPILE)as
301LD		= $(CROSS_COMPILE)ld
302CC		= $(CROSS_COMPILE)gcc
303CPP		= $(CC) -E
304AR		= $(CROSS_COMPILE)ar
305NM		= $(CROSS_COMPILE)nm
306STRIP		= $(CROSS_COMPILE)strip
307OBJCOPY		= $(CROSS_COMPILE)objcopy
308OBJDUMP		= $(CROSS_COMPILE)objdump
309AWK		= awk
310GENKSYMS	= scripts/genksyms/genksyms
311DEPMOD		= /sbin/depmod
312KALLSYMS	= scripts/kallsyms
313PERL		= perl
314CHECK		= sparse
315
316CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
317MODFLAGS	= -DMODULE
318CFLAGS_MODULE   = $(MODFLAGS)
319AFLAGS_MODULE   = $(MODFLAGS)
320LDFLAGS_MODULE  =
321CFLAGS_KERNEL	=
322AFLAGS_KERNEL	=
323
324
325# Use LINUXINCLUDE when you must reference the include/ directory.
326# Needed to be compatible with the O= option
327LINUXINCLUDE    := -Iinclude \
328                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
329		   -include include/linux/autoconf.h
330
331KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
332
333KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
334		   -fno-strict-aliasing -fno-common \
335		   -Werror-implicit-function-declaration
336KBUILD_AFLAGS   := -D__ASSEMBLY__
337
338# Read KERNELRELEASE from include/config/kernel.release (if it exists)
339KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
340KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
341
342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
344export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
345export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
346
347export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
348export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
349export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
350
351# When compiling out-of-tree modules, put MODVERDIR in the module
352# tree rather than in the kernel tree. The kernel tree might
353# even be read-only.
354export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
355
356# Files to ignore in find ... statements
357
358RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
359export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
360
361# ===========================================================================
362# Rules shared between *config targets and build targets
363
364# Basic helpers built in scripts/
365PHONY += scripts_basic
366scripts_basic:
367	$(Q)$(MAKE) $(build)=scripts/basic
368
369# To avoid any implicit rule to kick in, define an empty command.
370scripts/basic/%: scripts_basic ;
371
372PHONY += outputmakefile
373# outputmakefile generates a Makefile in the output directory, if using a
374# separate output directory. This allows convenient use of make in the
375# output directory.
376outputmakefile:
377ifneq ($(KBUILD_SRC),)
378	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
379	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
380endif
381
382# To make sure we do not include .config for any of the *config targets
383# catch them early, and hand them over to scripts/kconfig/Makefile
384# It is allowed to specify more targets when calling make, including
385# mixing *config targets and build targets.
386# For example 'make oldconfig all'.
387# Detect when mixed targets is specified, and make a second invocation
388# of make so .config is not included in this case either (for *config).
389
390no-dot-config-targets := clean mrproper distclean \
391			 cscope TAGS tags help %docs check% \
392			 include/linux/version.h headers_% \
393			 kernelrelease kernelversion
394
395config-targets := 0
396mixed-targets  := 0
397dot-config     := 1
398
399ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
400	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
401		dot-config := 0
402	endif
403endif
404
405ifeq ($(KBUILD_EXTMOD),)
406        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
407                config-targets := 1
408                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
409                        mixed-targets := 1
410                endif
411        endif
412endif
413
414ifeq ($(mixed-targets),1)
415# ===========================================================================
416# We're called with mixed targets (*config and build targets).
417# Handle them one by one.
418
419%:: FORCE
420	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
421
422else
423ifeq ($(config-targets),1)
424# ===========================================================================
425# *config targets only - make sure prerequisites are updated, and descend
426# in scripts/kconfig to make the *config target
427
428# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
429# KBUILD_DEFCONFIG may point out an alternative default configuration
430# used for 'make defconfig'
431include $(srctree)/arch/$(SRCARCH)/Makefile
432export KBUILD_DEFCONFIG
433
434config %config: scripts_basic outputmakefile FORCE
435	$(Q)mkdir -p include/linux include/config
436	$(Q)$(MAKE) $(build)=scripts/kconfig $@
437
438else
439# ===========================================================================
440# Build targets only - this includes vmlinux, arch specific targets, clean
441# targets and others. In general all targets except *config targets.
442
443ifeq ($(KBUILD_EXTMOD),)
444# Additional helpers built in scripts/
445# Carefully list dependencies so we do not try to build scripts twice
446# in parallel
447PHONY += scripts
448scripts: scripts_basic include/config/auto.conf
449	$(Q)$(MAKE) $(build)=$(@)
450
451# Objects we will link into vmlinux / subdirs we need to visit
452init-y		:= init/
453drivers-y	:= drivers/ sound/
454net-y		:= net/
455libs-y		:= lib/
456core-y		:= usr/
457endif # KBUILD_EXTMOD
458
459ifeq ($(dot-config),1)
460# Read in config
461-include include/config/auto.conf
462
463ifeq ($(KBUILD_EXTMOD),)
464# Read in dependencies to all Kconfig* files, make sure to run
465# oldconfig if changes are detected.
466-include include/config/auto.conf.cmd
467
468# To avoid any implicit rule to kick in, define an empty command
469$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
470
471# If .config is newer than include/config/auto.conf, someone tinkered
472# with it and forgot to run make oldconfig.
473# if auto.conf.cmd is missing then we are probably in a cleaned tree so
474# we execute the config step to be sure to catch updated Kconfig files
475include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
476	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
477else
478# external modules needs include/linux/autoconf.h and include/config/auto.conf
479# but do not care if they are up-to-date. Use auto.conf to trigger the test
480PHONY += include/config/auto.conf
481
482include/config/auto.conf:
483	$(Q)test -e include/linux/autoconf.h -a -e $@ || (		\
484	echo;								\
485	echo "  ERROR: Kernel configuration is invalid.";		\
486	echo "         include/linux/autoconf.h or $@ are missing.";	\
487	echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
488	echo;								\
489	/bin/false)
490
491endif # KBUILD_EXTMOD
492
493else
494# Dummy target needed, because used as prerequisite
495include/config/auto.conf: ;
496endif # $(dot-config)
497
498# The all: target is the default when no target is given on the
499# command line.
500# This allow a user to issue only 'make' to build a kernel including modules
501# Defaults vmlinux but it is usually overridden in the arch makefile
502all: vmlinux
503
504ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
505KBUILD_CFLAGS	+= -Os
506else
507KBUILD_CFLAGS	+= -O2
508endif
509
510ifneq (CONFIG_FRAME_WARN,0)
511KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
512endif
513
514# Force gcc to behave correct even for buggy distributions
515# Arch Makefiles may override this setting
516KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
517
518include $(srctree)/arch/$(SRCARCH)/Makefile
519
520ifdef CONFIG_FRAME_POINTER
521KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
522else
523KBUILD_CFLAGS	+= -fomit-frame-pointer
524endif
525
526ifdef CONFIG_DEBUG_INFO
527KBUILD_CFLAGS	+= -g
528KBUILD_AFLAGS	+= -gdwarf-2
529endif
530
531# We trigger additional mismatches with less inlining
532ifdef CONFIG_DEBUG_SECTION_MISMATCH
533KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
534endif
535
536# arch Makefile may override CC so keep this after arch Makefile is included
537NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
538CHECKFLAGS     += $(NOSTDINC_FLAGS)
539
540# warn about C99 declaration after statement
541KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
542
543# disable pointer signed / unsigned warnings in gcc 4.0
544KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
545
546# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
547# But warn user when we do so
548warn-assign = \
549$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
550
551ifneq ($(KCPPFLAGS),)
552        $(call warn-assign,CPPFLAGS)
553        KBUILD_CPPFLAGS += $(KCPPFLAGS)
554endif
555ifneq ($(KAFLAGS),)
556        $(call warn-assign,AFLAGS)
557        KBUILD_AFLAGS += $(KAFLAGS)
558endif
559ifneq ($(KCFLAGS),)
560        $(call warn-assign,CFLAGS)
561        KBUILD_CFLAGS += $(KCFLAGS)
562endif
563
564# Use --build-id when available.
565LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
566			      $(call ld-option, -Wl$(comma)--build-id,))
567LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
568LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
569
570# Default kernel image to build when no specific target is given.
571# KBUILD_IMAGE may be overruled on the command line or
572# set in the environment
573# Also any assignments in arch/$(ARCH)/Makefile take precedence over
574# this default value
575export KBUILD_IMAGE ?= vmlinux
576
577#
578# INSTALL_PATH specifies where to place the updated kernel and system map
579# images. Default is /boot, but you can set it to other values
580export	INSTALL_PATH ?= /boot
581
582#
583# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
584# relocations required by build roots.  This is not defined in the
585# makefile but the argument can be passed to make if needed.
586#
587
588MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
589export MODLIB
590
591#
592#  INSTALL_MOD_STRIP, if defined, will cause modules to be
593#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
594#  the default option --strip-debug will be used.  Otherwise,
595#  INSTALL_MOD_STRIP will used as the options to the strip command.
596
597ifdef INSTALL_MOD_STRIP
598ifeq ($(INSTALL_MOD_STRIP),1)
599mod_strip_cmd = $(STRIP) --strip-debug
600else
601mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
602endif # INSTALL_MOD_STRIP=1
603else
604mod_strip_cmd = true
605endif # INSTALL_MOD_STRIP
606export mod_strip_cmd
607
608
609ifeq ($(KBUILD_EXTMOD),)
610core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
611
612vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
613		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
614		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
615
616vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
617		     $(init-n) $(init-) \
618		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
619		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
620
621init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
622core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
623drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
624net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
625libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
626libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
627libs-y		:= $(libs-y1) $(libs-y2)
628
629# Build vmlinux
630# ---------------------------------------------------------------------------
631# vmlinux is built from the objects selected by $(vmlinux-init) and
632# $(vmlinux-main). Most are built-in.o files from top-level directories
633# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
634# Ordering when linking is important, and $(vmlinux-init) must be first.
635#
636# vmlinux
637#   ^
638#   |
639#   +-< $(vmlinux-init)
640#   |   +--< init/version.o + more
641#   |
642#   +--< $(vmlinux-main)
643#   |    +--< driver/built-in.o mm/built-in.o + more
644#   |
645#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
646#
647# vmlinux version (uname -v) cannot be updated during normal
648# descending-into-subdirs phase since we do not yet know if we need to
649# update vmlinux.
650# Therefore this step is delayed until just before final link of vmlinux -
651# except in the kallsyms case where it is done just before adding the
652# symbols to the kernel.
653#
654# System.map is generated to document addresses of all kernel symbols
655
656vmlinux-init := $(head-y) $(init-y)
657vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
658vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
659vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
660export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
661
662# Rule to link vmlinux - also used during CONFIG_KALLSYMS
663# May be overridden by arch/$(ARCH)/Makefile
664quiet_cmd_vmlinux__ ?= LD      $@
665      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
666      -T $(vmlinux-lds) $(vmlinux-init)                          \
667      --start-group $(vmlinux-main) --end-group                  \
668      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
669
670# Generate new vmlinux version
671quiet_cmd_vmlinux_version = GEN     .version
672      cmd_vmlinux_version = set -e;                     \
673	if [ ! -r .version ]; then			\
674	  rm -f .version;				\
675	  echo 1 >.version;				\
676	else						\
677	  mv .version .old_version;			\
678	  expr 0$$(cat .old_version) + 1 >.version;	\
679	fi;						\
680	$(MAKE) $(build)=init
681
682# Generate System.map
683quiet_cmd_sysmap = SYSMAP
684      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
685
686# Link of vmlinux
687# If CONFIG_KALLSYMS is set .version is already updated
688# Generate System.map and verify that the content is consistent
689# Use + in front of the vmlinux_version rule to silent warning with make -j2
690# First command is ':' to allow us to use + in front of the rule
691define rule_vmlinux__
692	:
693	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
694
695	$(call cmd,vmlinux__)
696	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
697
698	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
699	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
700	$(cmd_sysmap) $@ System.map;                                         \
701	if [ $$? -ne 0 ]; then                                               \
702		rm -f $@;                                                    \
703		/bin/false;                                                  \
704	fi;
705	$(verify_kallsyms)
706endef
707
708
709ifdef CONFIG_KALLSYMS
710# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
711# It's a three stage process:
712# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
713#   empty
714#   Running kallsyms on that gives us .tmp_kallsyms1.o with
715#   the right size - vmlinux version (uname -v) is updated during this step
716# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
717#   but due to the added section, some addresses have shifted.
718#   From here, we generate a correct .tmp_kallsyms2.o
719# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
720# o Verify that the System.map from vmlinux matches the map from
721#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
722# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
723#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
724#   temporary bypass to allow the kernel to be built while the
725#   maintainers work out what went wrong with kallsyms.
726
727ifdef CONFIG_KALLSYMS_EXTRA_PASS
728last_kallsyms := 3
729else
730last_kallsyms := 2
731endif
732
733kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
734
735define verify_kallsyms
736	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
737	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
738	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
739	$(Q)cmp -s System.map .tmp_System.map ||                             \
740		(echo Inconsistent kallsyms data;                            \
741		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
742		 rm .tmp_kallsyms* ; /bin/false )
743endef
744
745# Update vmlinux version before link
746# Use + in front of this rule to silent warning about make -j1
747# First command is ':' to allow us to use + in front of this rule
748cmd_ksym_ld = $(cmd_vmlinux__)
749define rule_ksym_ld
750	:
751	+$(call cmd,vmlinux_version)
752	$(call cmd,vmlinux__)
753	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
754endef
755
756# Generate .S file with all kernel symbols
757quiet_cmd_kallsyms = KSYM    $@
758      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
759                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
760
761.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
762	$(call if_changed_dep,as_o_S)
763
764.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
765	$(call cmd,kallsyms)
766
767# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
768.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
769	$(call if_changed_rule,ksym_ld)
770
771.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
772	$(call if_changed,vmlinux__)
773
774.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
775	$(call if_changed,vmlinux__)
776
777# Needs to visit scripts/ before $(KALLSYMS) can be used.
778$(KALLSYMS): scripts ;
779
780# Generate some data for debugging strange kallsyms problems
781debug_kallsyms: .tmp_map$(last_kallsyms)
782
783.tmp_map%: .tmp_vmlinux% FORCE
784	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
785
786.tmp_map3: .tmp_map2
787
788.tmp_map2: .tmp_map1
789
790endif # ifdef CONFIG_KALLSYMS
791
792# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
793# relevant sections renamed as per the linker script.
794quiet_cmd_vmlinux-modpost = LD      $@
795      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
796	 $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
797	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
798define rule_vmlinux-modpost
799	:
800	+$(call cmd,vmlinux-modpost)
801	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
802	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
803endef
804
805# vmlinux image - including updated kernel symbols
806vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
807ifdef CONFIG_HEADERS_CHECK
808	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
809endif
810ifdef CONFIG_SAMPLES
811	$(Q)$(MAKE) $(build)=samples
812endif
813	$(call vmlinux-modpost)
814	$(call if_changed_rule,vmlinux__)
815	$(Q)rm -f .old_version
816
817# build vmlinux.o first to catch section mismatch errors early
818ifdef CONFIG_KALLSYMS
819.tmp_vmlinux1: vmlinux.o
820endif
821
822modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
823vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
824	$(call if_changed_rule,vmlinux-modpost)
825
826# The actual objects are generated when descending,
827# make sure no implicit rule kicks in
828$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
829
830# Handle descending into subdirectories listed in $(vmlinux-dirs)
831# Preset locale variables to speed up the build process. Limit locale
832# tweaks to this spot to avoid wrong language settings when running
833# make menuconfig etc.
834# Error messages still appears in the original language
835
836PHONY += $(vmlinux-dirs)
837$(vmlinux-dirs): prepare scripts
838	$(Q)$(MAKE) $(build)=$@
839
840# Build the kernel release string
841#
842# The KERNELRELEASE value built here is stored in the file
843# include/config/kernel.release, and is used when executing several
844# make targets, such as "make install" or "make modules_install."
845#
846# The eventual kernel release string consists of the following fields,
847# shown in a hierarchical format to show how smaller parts are concatenated
848# to form the larger and final value, with values coming from places like
849# the Makefile, kernel config options, make command line options and/or
850# SCM tag information.
851#
852#	$(KERNELVERSION)
853#	  $(VERSION)			eg, 2
854#	  $(PATCHLEVEL)			eg, 6
855#	  $(SUBLEVEL)			eg, 18
856#	  $(EXTRAVERSION)		eg, -rc6
857#	$(localver-full)
858#	  $(localver)
859#	    localversion*		(files without backups, containing '~')
860#	    $(CONFIG_LOCALVERSION)	(from kernel config setting)
861#	  $(localver-auto)		(only if CONFIG_LOCALVERSION_AUTO is set)
862#	    ./scripts/setlocalversion	(SCM tag, if one exists)
863#	    $(LOCALVERSION)		(from make command line if provided)
864#
865#  Note how the final $(localver-auto) string is included *only* if the
866# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
867# moment, only git is supported but other SCMs can edit the script
868# scripts/setlocalversion and add the appropriate checks as needed.
869
870pattern = ".*/localversion[^~]*"
871string  = $(shell cat /dev/null \
872	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
873
874localver = $(subst $(space),, $(string) \
875			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
876
877# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
878# and if the SCM is know a tag from the SCM is appended.
879# The appended tag is determined by the SCM used.
880#
881# Currently, only git is supported.
882# Other SCMs can edit scripts/setlocalversion and add the appropriate
883# checks as needed.
884ifdef CONFIG_LOCALVERSION_AUTO
885	_localver-auto = $(shell $(CONFIG_SHELL) \
886	                  $(srctree)/scripts/setlocalversion $(srctree))
887	localver-auto  = $(LOCALVERSION)$(_localver-auto)
888endif
889
890localver-full = $(localver)$(localver-auto)
891
892# Store (new) KERNELRELASE string in include/config/kernel.release
893kernelrelease = $(KERNELVERSION)$(localver-full)
894include/config/kernel.release: include/config/auto.conf FORCE
895	$(Q)rm -f $@
896	$(Q)echo $(kernelrelease) > $@
897
898
899# Things we need to do before we recursively start building the kernel
900# or the modules are listed in "prepare".
901# A multi level approach is used. prepareN is processed before prepareN-1.
902# archprepare is used in arch Makefiles and when processed asm symlink,
903# version.h and scripts_basic is processed / created.
904
905# Listed in dependency order
906PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
907
908# prepare3 is used to check if we are building in a separate output directory,
909# and if so do:
910# 1) Check that make has not been executed in the kernel src $(srctree)
911# 2) Create the include2 directory, used for the second asm symlink
912prepare3: include/config/kernel.release
913ifneq ($(KBUILD_SRC),)
914	@echo '  Using $(srctree) as source for kernel'
915	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
916		echo "  $(srctree) is not clean, please run 'make mrproper'";\
917		echo "  in the '$(srctree)' directory.";\
918		/bin/false; \
919	fi;
920	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
921	$(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
922endif
923
924# prepare2 creates a makefile if using a separate output directory
925prepare2: prepare3 outputmakefile
926
927prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
928                   include/asm include/config/auto.conf
929	$(cmd_crmodverdir)
930
931archprepare: prepare1 scripts_basic
932
933prepare0: archprepare FORCE
934	$(Q)$(MAKE) $(build)=.
935	$(Q)$(MAKE) $(build)=. missing-syscalls
936
937# All the preparing..
938prepare: prepare0
939
940# Leave this as default for preprocessing vmlinux.lds.S, which is now
941# done in arch/$(ARCH)/kernel/Makefile
942
943export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
944
945# The asm symlink changes when $(ARCH) changes.
946# Detect this and ask user to run make mrproper
947
948include/asm: FORCE
949	$(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
950	if [ -L include/asm ]; then                                     \
951		if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
952			echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
953			echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
954			exit 1;                                         \
955		fi;                                                     \
956	else                                                            \
957		echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
958		if [ ! -d include ]; then                               \
959			mkdir -p include;                               \
960		fi;                                                     \
961		ln -fsn asm-$(SRCARCH) $@;                              \
962	fi
963
964# Generate some files
965# ---------------------------------------------------------------------------
966
967# KERNELRELEASE can change from a few different places, meaning version.h
968# needs to be updated, so this check is forced on all builds
969
970uts_len := 64
971define filechk_utsrelease.h
972	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
973	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
974	  exit 1;                                                         \
975	fi;                                                               \
976	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
977endef
978
979define filechk_version.h
980	(echo \#define LINUX_VERSION_CODE $(shell                             \
981	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
982	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
983endef
984
985include/linux/version.h: $(srctree)/Makefile FORCE
986	$(call filechk,version.h)
987
988include/linux/utsrelease.h: include/config/kernel.release FORCE
989	$(call filechk,utsrelease.h)
990
991# ---------------------------------------------------------------------------
992
993PHONY += depend dep
994depend dep:
995	@echo '*** Warning: make $@ is unnecessary now.'
996
997# ---------------------------------------------------------------------------
998# Kernel headers
999INSTALL_HDR_PATH=$(objtree)/usr
1000export INSTALL_HDR_PATH
1001
1002HDRFILTER=generic i386 x86_64
1003HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
1004
1005PHONY += headers_install_all
1006headers_install_all: include/linux/version.h scripts_basic FORCE
1007	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1008	$(Q)for arch in $(HDRARCHES); do \
1009	 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1010	 done
1011
1012PHONY += headers_install
1013headers_install: include/linux/version.h scripts_basic FORCE
1014	@if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1015	  echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1016	  exit 1 ; fi
1017	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1018	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1019
1020PHONY += headers_check_all
1021headers_check_all: headers_install_all
1022	$(Q)for arch in $(HDRARCHES); do \
1023	 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1024	 done
1025
1026PHONY += headers_check
1027headers_check: headers_install
1028	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1029
1030# ---------------------------------------------------------------------------
1031# Modules
1032
1033ifdef CONFIG_MODULES
1034
1035# By default, build modules as well
1036
1037all: modules
1038
1039#	Build modules
1040#
1041#	A module can be listed more than once in obj-m resulting in
1042#	duplicate lines in modules.order files.  Those are removed
1043#	using awk while concatenating to the final file.
1044
1045PHONY += modules
1046modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1047	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1048	@echo '  Building modules, stage 2.';
1049	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1050
1051
1052# Target to prepare building external modules
1053PHONY += modules_prepare
1054modules_prepare: prepare scripts
1055
1056# Target to install modules
1057PHONY += modules_install
1058modules_install: _modinst_ _modinst_post
1059
1060PHONY += _modinst_
1061_modinst_:
1062	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1063		echo "Warning: you may need to install module-init-tools"; \
1064		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1065		sleep 1; \
1066	fi
1067	@rm -rf $(MODLIB)/kernel
1068	@rm -f $(MODLIB)/source
1069	@mkdir -p $(MODLIB)/kernel
1070	@ln -s $(srctree) $(MODLIB)/source
1071	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1072		rm -f $(MODLIB)/build ; \
1073		ln -s $(objtree) $(MODLIB)/build ; \
1074	fi
1075	@cp -f $(objtree)/modules.order $(MODLIB)/
1076	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1077
1078# This depmod is only for convenience to give the initial
1079# boot a modules.dep even before / is mounted read-write.  However the
1080# boot script depmod is the master version.
1081PHONY += _modinst_post
1082_modinst_post: _modinst_
1083	$(call cmd,depmod)
1084
1085else # CONFIG_MODULES
1086
1087# Modules not configured
1088# ---------------------------------------------------------------------------
1089
1090modules modules_install: FORCE
1091	@echo
1092	@echo "The present kernel configuration has modules disabled."
1093	@echo "Type 'make config' and enable loadable module support."
1094	@echo "Then build a kernel with module support enabled."
1095	@echo
1096	@exit 1
1097
1098endif # CONFIG_MODULES
1099
1100###
1101# Cleaning is done on three levels.
1102# make clean     Delete most generated files
1103#                Leave enough to build external modules
1104# make mrproper  Delete the current configuration, and all generated files
1105# make distclean Remove editor backup files, patch leftover files and the like
1106
1107# Directories & files removed with 'make clean'
1108CLEAN_DIRS  += $(MODVERDIR)
1109CLEAN_FILES +=	vmlinux System.map \
1110                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1111
1112# Directories & files removed with 'make mrproper'
1113MRPROPER_DIRS  += include/config include2 usr/include
1114MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1115                  include/linux/autoconf.h include/linux/version.h      \
1116                  include/linux/utsrelease.h                            \
1117		  Module.symvers tags TAGS cscope*
1118
1119# clean - Delete most, but leave enough to build external modules
1120#
1121clean: rm-dirs  := $(CLEAN_DIRS)
1122clean: rm-files := $(CLEAN_FILES)
1123clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1124
1125PHONY += $(clean-dirs) clean archclean
1126$(clean-dirs):
1127	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1128
1129clean: archclean $(clean-dirs)
1130	$(call cmd,rmdirs)
1131	$(call cmd,rmfiles)
1132	@find . $(RCS_FIND_IGNORE) \
1133		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1134		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1135		-o -name '*.symtypes' -o -name 'modules.order' \) \
1136		-type f -print | xargs rm -f
1137
1138# mrproper - Delete all generated files, including .config
1139#
1140mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1141mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1142mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1143
1144PHONY += $(mrproper-dirs) mrproper archmrproper
1145$(mrproper-dirs):
1146	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1147
1148mrproper: clean archmrproper $(mrproper-dirs)
1149	$(call cmd,rmdirs)
1150	$(call cmd,rmfiles)
1151
1152# distclean
1153#
1154PHONY += distclean
1155
1156distclean: mrproper
1157	@find $(srctree) $(RCS_FIND_IGNORE) \
1158		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1159		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1160		-o -name '.*.rej' -o -size 0 \
1161		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1162		-type f -print | xargs rm -f
1163
1164
1165# Packaging of the kernel to various formats
1166# ---------------------------------------------------------------------------
1167# rpm target kept for backward compatibility
1168package-dir	:= $(srctree)/scripts/package
1169
1170%pkg: include/config/kernel.release FORCE
1171	$(Q)$(MAKE) $(build)=$(package-dir) $@
1172rpm: include/config/kernel.release FORCE
1173	$(Q)$(MAKE) $(build)=$(package-dir) $@
1174
1175
1176# Brief documentation of the typical targets used
1177# ---------------------------------------------------------------------------
1178
1179boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1180boards := $(notdir $(boards))
1181board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1182board-dirs := $(sort $(notdir $(board-dirs:/=)))
1183
1184help:
1185	@echo  'Cleaning targets:'
1186	@echo  '  clean		  - Remove most generated files but keep the config and'
1187	@echo  '                    enough build support to build external modules'
1188	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1189	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1190	@echo  ''
1191	@echo  'Configuration targets:'
1192	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1193	@echo  ''
1194	@echo  'Other generic targets:'
1195	@echo  '  all		  - Build all targets marked with [*]'
1196	@echo  '* vmlinux	  - Build the bare kernel'
1197	@echo  '* modules	  - Build all modules'
1198	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1199	@echo  '  dir/            - Build all files in dir and below'
1200	@echo  '  dir/file.[ois]  - Build specified target only'
1201	@echo  '  dir/file.ko     - Build module including final link'
1202	@echo  '  prepare         - Set up for building external modules'
1203	@echo  '  tags/TAGS	  - Generate tags file for editors'
1204	@echo  '  cscope	  - Generate cscope index'
1205	@echo  '  kernelrelease	  - Output the release version string'
1206	@echo  '  kernelversion	  - Output the version stored in Makefile'
1207	@if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1208	 echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1209	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1210	 fi
1211	@echo  ''
1212	@echo  'Static analysers'
1213	@echo  '  checkstack      - Generate a list of stack hogs'
1214	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1215	@echo  '  versioncheck    - Sanity check on version.h usage'
1216	@echo  '  includecheck    - Check for duplicate included header files'
1217	@echo  '  export_report   - List the usages of all exported symbols'
1218	@if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1219	 echo  '  headers_check   - Sanity check on exported headers'; \
1220	 fi
1221	@echo  ''
1222	@echo  'Kernel packaging:'
1223	@$(MAKE) $(build)=$(package-dir) help
1224	@echo  ''
1225	@echo  'Documentation targets:'
1226	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1227	@echo  ''
1228	@echo  'Architecture specific targets ($(SRCARCH)):'
1229	@$(if $(archhelp),$(archhelp),\
1230		echo '  No architecture specific help defined for $(SRCARCH)')
1231	@echo  ''
1232	@$(if $(boards), \
1233		$(foreach b, $(boards), \
1234		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1235		echo '')
1236	@$(if $(board-dirs), \
1237		$(foreach b, $(board-dirs), \
1238		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1239		printf "  %-16s - Show all of the above\\n" help-boards; \
1240		echo '')
1241
1242	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1243	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1244	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1245	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1246	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1247	@echo  ''
1248	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1249	@echo  'For further info see the ./README file'
1250
1251
1252help-board-dirs := $(addprefix help-,$(board-dirs))
1253
1254help-boards: $(help-board-dirs)
1255
1256boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1257
1258$(help-board-dirs): help-%:
1259	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1260	@$(if $(boards-per-dir), \
1261		$(foreach b, $(boards-per-dir), \
1262		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1263		echo '')
1264
1265
1266# Documentation targets
1267# ---------------------------------------------------------------------------
1268%docs: scripts_basic FORCE
1269	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1270
1271else # KBUILD_EXTMOD
1272
1273###
1274# External module support.
1275# When building external modules the kernel used as basis is considered
1276# read-only, and no consistency checks are made and the make
1277# system is not used on the basis kernel. If updates are required
1278# in the basis kernel ordinary make commands (without M=...) must
1279# be used.
1280#
1281# The following are the only valid targets when building external
1282# modules.
1283# make M=dir clean     Delete all automatically generated files
1284# make M=dir modules   Make all modules in specified dir
1285# make M=dir	       Same as 'make M=dir modules'
1286# make M=dir modules_install
1287#                      Install the modules built in the module directory
1288#                      Assumes install directory is already created
1289
1290# We are always building modules
1291KBUILD_MODULES := 1
1292PHONY += crmodverdir
1293crmodverdir:
1294	$(cmd_crmodverdir)
1295
1296PHONY += $(objtree)/Module.symvers
1297$(objtree)/Module.symvers:
1298	@test -e $(objtree)/Module.symvers || ( \
1299	echo; \
1300	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1301	echo "           is missing; modules will have no dependencies and modversions."; \
1302	echo )
1303
1304module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1305PHONY += $(module-dirs) modules
1306$(module-dirs): crmodverdir $(objtree)/Module.symvers
1307	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1308
1309modules: $(module-dirs)
1310	@echo '  Building modules, stage 2.';
1311	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1312
1313PHONY += modules_install
1314modules_install: _emodinst_ _emodinst_post
1315
1316install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1317PHONY += _emodinst_
1318_emodinst_:
1319	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1320	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1321
1322PHONY += _emodinst_post
1323_emodinst_post: _emodinst_
1324	$(call cmd,depmod)
1325
1326clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1327
1328PHONY += $(clean-dirs) clean
1329$(clean-dirs):
1330	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1331
1332clean:	rm-dirs := $(MODVERDIR)
1333clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1334clean: $(clean-dirs)
1335	$(call cmd,rmdirs)
1336	$(call cmd,rmfiles)
1337	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1338		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1339		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1340		-type f -print | xargs rm -f
1341
1342help:
1343	@echo  '  Building external modules.'
1344	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1345	@echo  ''
1346	@echo  '  modules         - default target, build the module(s)'
1347	@echo  '  modules_install - install the module'
1348	@echo  '  clean           - remove generated files in module directory only'
1349	@echo  ''
1350
1351# Dummies...
1352PHONY += prepare scripts
1353prepare: ;
1354scripts: ;
1355endif # KBUILD_EXTMOD
1356
1357# Generate tags for editors
1358# ---------------------------------------------------------------------------
1359
1360#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1361#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1362#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1363
1364ifeq ($(src),$(obj))
1365__srctree =
1366else
1367__srctree = $(srctree)/
1368endif
1369
1370ifeq ($(ALLSOURCE_ARCHS),)
1371ifeq ($(ARCH),um)
1372ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1373else
1374ALLINCLUDE_ARCHS := $(SRCARCH)
1375endif
1376else
1377#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1378ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1379endif
1380
1381ALLSOURCE_ARCHS := $(SRCARCH)
1382
1383define find-sources
1384        ( for arch in $(ALLSOURCE_ARCHS) ; do \
1385	       find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1386	            -name $1 -print; \
1387	  done ; \
1388	  find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1389	       -name $1 -print; \
1390	  find $(__srctree)include $(RCS_FIND_IGNORE) \
1391	       \( -name config -o -name 'asm-*' \) -prune \
1392	       -o -name $1 -print; \
1393	  for arch in $(ALLINCLUDE_ARCHS) ; do \
1394	       find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1395	            -name $1 -print; \
1396	  done ; \
1397	  find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1398	       -name $1 -print; \
1399	  find $(__srctree) $(RCS_FIND_IGNORE) \
1400	       \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1401	       -name $1 -print; \
1402	  )
1403endef
1404
1405define all-sources
1406	$(call find-sources,'*.[chS]')
1407endef
1408define all-kconfigs
1409	$(call find-sources,'Kconfig*')
1410endef
1411define all-defconfigs
1412	$(call find-sources,'defconfig')
1413endef
1414
1415define xtags
1416	if $1 --version 2>&1 | grep -iq exuberant; then \
1417	    $(all-sources) | xargs $1 -a \
1418		-I __initdata,__exitdata,__acquires,__releases \
1419		-I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1420		-I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1421		--extra=+f --c-kinds=+px \
1422		--regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1423	    $(all-kconfigs) | xargs $1 -a \
1424		--langdef=kconfig \
1425		--language-force=kconfig \
1426		--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1427	    $(all-defconfigs) | xargs -r $1 -a \
1428		--langdef=dotconfig \
1429		--language-force=dotconfig \
1430		--regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1431	elif $1 --version 2>&1 | grep -iq emacs; then \
1432	    $(all-sources) | xargs $1 -a; \
1433	    $(all-kconfigs) | xargs $1 -a \
1434		--regex='/^[ \t]*(menu|)config[ \t]+\([a-zA-Z0-9_]+\)/\2/'; \
1435	    $(all-defconfigs) | xargs -r $1 -a \
1436		--regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1437	else \
1438	    $(all-sources) | xargs $1 -a; \
1439	fi
1440endef
1441
1442quiet_cmd_cscope-file = FILELST cscope.files
1443      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1444
1445quiet_cmd_cscope = MAKE    cscope.out
1446      cmd_cscope = cscope -b
1447
1448cscope: FORCE
1449	$(call cmd,cscope-file)
1450	$(call cmd,cscope)
1451
1452quiet_cmd_TAGS = MAKE   $@
1453define cmd_TAGS
1454	rm -f $@; \
1455	$(call xtags,etags)
1456endef
1457
1458TAGS: FORCE
1459	$(call cmd,TAGS)
1460
1461quiet_cmd_tags = MAKE   $@
1462define cmd_tags
1463	rm -f $@; \
1464	$(call xtags,ctags)
1465endef
1466
1467tags: FORCE
1468	$(call cmd,tags)
1469
1470
1471# Scripts to check various things for consistency
1472# ---------------------------------------------------------------------------
1473
1474includecheck:
1475	find * $(RCS_FIND_IGNORE) \
1476		-name '*.[hcS]' -type f -print | sort \
1477		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1478
1479versioncheck:
1480	find * $(RCS_FIND_IGNORE) \
1481		-name '*.[hcS]' -type f -print | sort \
1482		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1483
1484namespacecheck:
1485	$(PERL) $(srctree)/scripts/namespace.pl
1486
1487export_report:
1488	$(PERL) $(srctree)/scripts/export_report.pl
1489
1490endif #ifeq ($(config-targets),1)
1491endif #ifeq ($(mixed-targets),1)
1492
1493PHONY += checkstack kernelrelease kernelversion
1494
1495# UML needs a little special treatment here.  It wants to use the host
1496# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1497# else wants $(ARCH), including people doing cross-builds, which means
1498# that $(SUBARCH) doesn't work here.
1499ifeq ($(ARCH), um)
1500CHECKSTACK_ARCH := $(SUBARCH)
1501else
1502CHECKSTACK_ARCH := $(ARCH)
1503endif
1504checkstack:
1505	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1506	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1507
1508kernelrelease:
1509	$(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1510	$(error kernelrelease not valid - run 'make prepare' to update it))
1511kernelversion:
1512	@echo $(KERNELVERSION)
1513
1514# Single targets
1515# ---------------------------------------------------------------------------
1516# Single targets are compatible with:
1517# - build with mixed source and output
1518# - build with separate output dir 'make O=...'
1519# - external modules
1520#
1521#  target-dir => where to store outputfile
1522#  build-dir  => directory in kernel source tree to use
1523
1524ifeq ($(KBUILD_EXTMOD),)
1525        build-dir  = $(patsubst %/,%,$(dir $@))
1526        target-dir = $(dir $@)
1527else
1528        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1529        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1530        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1531endif
1532
1533%.s: %.c prepare scripts FORCE
1534	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535%.i: %.c prepare scripts FORCE
1536	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537%.o: %.c prepare scripts FORCE
1538	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539%.lst: %.c prepare scripts FORCE
1540	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1541%.s: %.S prepare scripts FORCE
1542	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1543%.o: %.S prepare scripts FORCE
1544	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1545%.symtypes: %.c prepare scripts FORCE
1546	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1547
1548# Modules
1549/ %/: prepare scripts FORCE
1550	$(cmd_crmodverdir)
1551	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1552	$(build)=$(build-dir)
1553%.ko: prepare scripts FORCE
1554	$(cmd_crmodverdir)
1555	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1556	$(build)=$(build-dir) $(@:.ko=.o)
1557	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1558
1559# FIXME Should go into a make.lib or something
1560# ===========================================================================
1561
1562quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1563      cmd_rmdirs = rm -rf $(rm-dirs)
1564
1565quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1566      cmd_rmfiles = rm -f $(rm-files)
1567
1568# Run depmod only if we have System.map and depmod is executable
1569quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1570      cmd_depmod = \
1571	if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1572		$(DEPMOD) -ae -F System.map                                     \
1573		$(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1574		$(KERNELRELEASE);                                               \
1575	fi
1576
1577# Create temporary dir for module support files
1578# clean it up only when building all modules
1579cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1580                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1581
1582a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1583	  $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1584	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1585
1586quiet_cmd_as_o_S = AS      $@
1587cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1588
1589# read all saved command lines
1590
1591targets := $(wildcard $(sort $(targets)))
1592cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1593
1594ifneq ($(cmd_files),)
1595  $(cmd_files): ;	# Do not try to update included dependency files
1596  include $(cmd_files)
1597endif
1598
1599# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1600# Usage:
1601# $(Q)$(MAKE) $(clean)=dir
1602clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1603
1604endif	# skip-makefile
1605
1606PHONY += FORCE
1607FORCE:
1608
1609# Declare the contents of the .PHONY variable as phony.  We keep that
1610# information in a variable se we can use it in if_changed and friends.
1611.PHONY: $(PHONY)
1612