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