projects/linux·blob 648f4e3e · refs

1595 lines · 53.9 KiB

1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 32
4EXTRAVERSION = -rc8
5NAME = Man-Eating Seals of Antiquity
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
38ifeq ("$(origin V)", "command line")
39 KBUILD_VERBOSE = $(V)
40endif
41ifndef KBUILD_VERBOSE
42 KBUILD_VERBOSE = 0
43endif
44
45# Call a source code checker (by default, "sparse") as part of the
46# C compilation.
47#
48# Use 'make C=1' to enable checking of only re-compiled files.
49# Use 'make C=2' to enable checking of *all* source files, regardless
50# of whether they are re-compiled or not.
51#
52# See the file "Documentation/sparse.txt" for more details, including
53# where to get the "sparse" utility.
54
55ifeq ("$(origin C)", "command line")
56 KBUILD_CHECKSRC = $(C)
57endif
58ifndef KBUILD_CHECKSRC
59 KBUILD_CHECKSRC = 0
60endif
61
62# Use make M=dir to specify directory of external module to build
63# Old syntax make ... SUBDIRS=$PWD is still supported
64# Setting the environment variable KBUILD_EXTMOD take precedence
65ifdef SUBDIRS
66 KBUILD_EXTMOD ?= $(SUBDIRS)
67endif
68
69ifeq ("$(origin M)", "command line")
70 KBUILD_EXTMOD := $(M)
71endif
72
73# kbuild supports saving output files in a separate directory.
74# To locate output files in a separate directory two syntaxes are supported.
75# In both cases the working directory must be the root of the kernel src.
76# 1) O=
77# Use "make O=dir/to/store/output/files/"
78#
79# 2) Set KBUILD_OUTPUT
80# Set the environment variable KBUILD_OUTPUT to point to the directory
81# where the output files shall be placed.
82# export KBUILD_OUTPUT=dir/to/store/output/files/
83# make
84#
85# The O= assignment takes precedence over the KBUILD_OUTPUT environment
86# variable.
87
88
89# KBUILD_SRC is set on invocation of make in OBJ directory
90# KBUILD_SRC is not intended to be used by the regular user (for now)
91ifeq ($(KBUILD_SRC),)
92
93# OK, Make called in directory where kernel src resides
94# Do we want to locate output files in a separate directory?
95ifeq ("$(origin O)", "command line")
96 KBUILD_OUTPUT := $(O)
97endif
98
99# That's our default target when none is given on the command line
100PHONY := _all
101_all:
102
103# Cancel implicit rules on top Makefile
104$(CURDIR)/Makefile Makefile: ;
105
106ifneq ($(KBUILD_OUTPUT),)
107# Invoke a second make in the output directory, passing relevant variables
108# check that the output directory actually exists
109saved-output := $(KBUILD_OUTPUT)
110KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
111$(if $(KBUILD_OUTPUT),, \
112 $(error output directory "$(saved-output)" does not exist))
113
114PHONY += $(MAKECMDGOALS) sub-make
115
116$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
117 $(Q)@:
118
119sub-make: FORCE
120 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
121 KBUILD_SRC=$(CURDIR) \
122 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
123 $(filter-out _all sub-make,$(MAKECMDGOALS))
124
125# Leave processing to above invocation of make
126skip-makefile := 1
127endif # ifneq ($(KBUILD_OUTPUT),)
128endif # ifeq ($(KBUILD_SRC),)
129
130# We process the rest of the Makefile if this is the final invocation of make
131ifeq ($(skip-makefile),)
132
133# If building an external module we do not care about the all: rule
134# but instead _all depend on modules
135PHONY += all
136ifeq ($(KBUILD_EXTMOD),)
137_all: all
138else
139_all: modules
140endif
141
142srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
143objtree := $(CURDIR)
144src := $(srctree)
145obj := $(objtree)
146
147VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
148
149export srctree objtree VPATH
150
151
152# SUBARCH tells the usermode build what the underlying arch is. That is set
153# first, and if a usermode build is happening, the "ARCH=um" on the command
154# line overrides the setting of ARCH below. If a native build is happening,
155# then ARCH is assigned, getting whatever value it gets normally, and
156# SUBARCH is subsequently ignored.
157
158SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
159 -e s/arm.*/arm/ -e s/sa110/arm/ \
160 -e s/s390x/s390/ -e s/parisc64/parisc/ \
161 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
162 -e s/sh[234].*/sh/ )
163
164# Cross compiling and selecting different set of gcc/bin-utils
165# ---------------------------------------------------------------------------
166#
167# When performing cross compilation for other architectures ARCH shall be set
168# to the target architecture. (See arch/* for the possibilities).
169# ARCH can be set during invocation of make:
170# make ARCH=ia64
171# Another way is to have ARCH set in the environment.
172# The default ARCH is the host where make is executed.
173
174# CROSS_COMPILE specify the prefix used for all executables used
175# during compilation. Only gcc and related bin-utils executables
176# are prefixed with $(CROSS_COMPILE).
177# CROSS_COMPILE can be set on the command line
178# make CROSS_COMPILE=ia64-linux-
179# Alternatively CROSS_COMPILE can be set in the environment.
180# Default value for CROSS_COMPILE is not to prefix executables
181# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
182export KBUILD_BUILDHOST := $(SUBARCH)
183ARCH ?= $(SUBARCH)
184CROSS_COMPILE ?=
185
186# Architecture as present in compile.h
187UTS_MACHINE := $(ARCH)
188SRCARCH := $(ARCH)
189
190# Additional ARCH settings for x86
191ifeq ($(ARCH),i386)
192 SRCARCH := x86
193endif
194ifeq ($(ARCH),x86_64)
195 SRCARCH := x86
196endif
197
198# Additional ARCH settings for sparc
199ifeq ($(ARCH),sparc64)
200 SRCARCH := sparc
201endif
202
203# Additional ARCH settings for sh
204ifeq ($(ARCH),sh64)
205 SRCARCH := sh
206endif
207
208# Where to locate arch specific headers
209hdr-arch := $(SRCARCH)
210
211ifeq ($(ARCH),m68knommu)
212 hdr-arch := m68k
213endif
214
215KCONFIG_CONFIG ?= .config
216
217# SHELL used by kbuild
218CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
219 else if [ -x /bin/bash ]; then echo /bin/bash; \
220 else echo sh; fi ; fi)
221
222HOSTCC = gcc
223HOSTCXX = g++
224HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
225HOSTCXXFLAGS = -O2
226
227# Decide whether to build built-in, modular, or both.
228# Normally, just do built-in.
229
230KBUILD_MODULES :=
231KBUILD_BUILTIN := 1
232
233# If we have only "make modules", don't compile built-in objects.
234# When we're building modules with modversions, we need to consider
235# the built-in objects during the descend as well, in order to
236# make sure the checksums are up to date before we record them.
237
238ifeq ($(MAKECMDGOALS),modules)
239 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
240endif
241
242# If we have "make <whatever> modules", compile modules
243# in addition to whatever we do anyway.
244# Just "make" or "make all" shall build modules as well
245
246ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
247 KBUILD_MODULES := 1
248endif
249
250ifeq ($(MAKECMDGOALS),)
251 KBUILD_MODULES := 1
252endif
253
254export KBUILD_MODULES KBUILD_BUILTIN
255export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
256
257# Beautify output
258# ---------------------------------------------------------------------------
259#
260# Normally, we echo the whole command before executing it. By making
261# that echo $($(quiet)$(cmd)), we now have the possibility to set
262# $(quiet) to choose other forms of output instead, e.g.
263#
264# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
265# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
266#
267# If $(quiet) is empty, the whole command will be printed.
268# If it is set to "quiet_", only the short version will be printed.
269# If it is set to "silent_", nothing will be printed at all, since
270# the variable $(silent_cmd_cc_o_c) doesn't exist.
271#
272# A simple variant is to prefix commands with $(Q) - that's useful
273# for commands that shall be hidden in non-verbose mode.
274#
275# $(Q)ln $@ :<
276#
277# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
278# If KBUILD_VERBOSE equals 1 then the above command is displayed.
279
280ifeq ($(KBUILD_VERBOSE),1)
281 quiet =
282 Q =
283else
284 quiet=quiet_
285 Q = @
286endif
287
288# If the user is running make -s (silent mode), suppress echoing of
289# commands
290
291ifneq ($(findstring s,$(MAKEFLAGS)),)
292 quiet=silent_
293endif
294
295export quiet Q KBUILD_VERBOSE
296
297
298# Look for make include files relative to root of kernel src
299MAKEFLAGS += --include-dir=$(srctree)
300
301# We need some generic definitions (do not try to remake the file).
302$(srctree)/scripts/Kbuild.include: ;
303include $(srctree)/scripts/Kbuild.include
304
305# Make variables (CC, etc...)
306
307AS = $(CROSS_COMPILE)as
308LD = $(CROSS_COMPILE)ld
309CC = $(CROSS_COMPILE)gcc
310CPP = $(CC) -E
311AR = $(CROSS_COMPILE)ar
312NM = $(CROSS_COMPILE)nm
313STRIP = $(CROSS_COMPILE)strip
314OBJCOPY = $(CROSS_COMPILE)objcopy
315OBJDUMP = $(CROSS_COMPILE)objdump
316AWK = awk
317GENKSYMS = scripts/genksyms/genksyms
318INSTALLKERNEL := installkernel
319DEPMOD = /sbin/depmod
320KALLSYMS = scripts/kallsyms
321PERL = perl
322CHECK = sparse
323
324CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
325 -Wbitwise -Wno-return-void $(CF)
326MODFLAGS = -DMODULE
327CFLAGS_MODULE = $(MODFLAGS)
328AFLAGS_MODULE = $(MODFLAGS)
329LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
330CFLAGS_KERNEL =
331AFLAGS_KERNEL =
332CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
333
334
335# Use LINUXINCLUDE when you must reference the include/ directory.
336# Needed to be compatible with the O= option
337LINUXINCLUDE := -Iinclude \
338 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
339 -I$(srctree)/arch/$(hdr-arch)/include \
340 -include include/linux/autoconf.h
341
342KBUILD_CPPFLAGS := -D__KERNEL__
343
344KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
345 -fno-strict-aliasing -fno-common \
346 -Werror-implicit-function-declaration \
347 -Wno-format-security \
348 -fno-delete-null-pointer-checks
349KBUILD_AFLAGS := -D__ASSEMBLY__
350
351# Read KERNELRELEASE from include/config/kernel.release (if it exists)
352KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
353KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
354
355export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
356export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
357export CPP AR NM STRIP OBJCOPY OBJDUMP
358export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
359export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
360
361export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
362export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
363export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
364
365# When compiling out-of-tree modules, put MODVERDIR in the module
366# tree rather than in the kernel tree. The kernel tree might
367# even be read-only.
368export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
369
370# Files to ignore in find ... statements
371
372RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
373export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
374
375# ===========================================================================
376# Rules shared between *config targets and build targets
377
378# Basic helpers built in scripts/
379PHONY += scripts_basic
380scripts_basic:
381 $(Q)$(MAKE) $(build)=scripts/basic
382
383# To avoid any implicit rule to kick in, define an empty command.
384scripts/basic/%: scripts_basic ;
385
386PHONY += outputmakefile
387# outputmakefile generates a Makefile in the output directory, if using a
388# separate output directory. This allows convenient use of make in the
389# output directory.
390outputmakefile:
391ifneq ($(KBUILD_SRC),)
392 $(Q)ln -fsn $(srctree) source
393 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
394 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
395endif
396
397# To make sure we do not include .config for any of the *config targets
398# catch them early, and hand them over to scripts/kconfig/Makefile
399# It is allowed to specify more targets when calling make, including
400# mixing *config targets and build targets.
401# For example 'make oldconfig all'.
402# Detect when mixed targets is specified, and make a second invocation
403# of make so .config is not included in this case either (for *config).
404
405no-dot-config-targets := clean mrproper distclean \
406 cscope TAGS tags help %docs check% \
407 include/linux/version.h headers_% \
408 kernelrelease kernelversion
409
410config-targets := 0
411mixed-targets := 0
412dot-config := 1
413
414ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
415 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
416 dot-config := 0
417 endif
418endif
419
420ifeq ($(KBUILD_EXTMOD),)
421 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
422 config-targets := 1
423 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
424 mixed-targets := 1
425 endif
426 endif
427endif
428
429ifeq ($(mixed-targets),1)
430# ===========================================================================
431# We're called with mixed targets (*config and build targets).
432# Handle them one by one.
433
434%:: FORCE
435 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
436
437else
438ifeq ($(config-targets),1)
439# ===========================================================================
440# *config targets only - make sure prerequisites are updated, and descend
441# in scripts/kconfig to make the *config target
442
443# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
444# KBUILD_DEFCONFIG may point out an alternative default configuration
445# used for 'make defconfig'
446include $(srctree)/arch/$(SRCARCH)/Makefile
447export KBUILD_DEFCONFIG KBUILD_KCONFIG
448
449config: scripts_basic outputmakefile FORCE
450 $(Q)mkdir -p include/linux include/config
451 $(Q)$(MAKE) $(build)=scripts/kconfig $@
452
453%config: scripts_basic outputmakefile FORCE
454 $(Q)mkdir -p include/linux include/config
455 $(Q)$(MAKE) $(build)=scripts/kconfig $@
456
457else
458# ===========================================================================
459# Build targets only - this includes vmlinux, arch specific targets, clean
460# targets and others. In general all targets except *config targets.
461
462ifeq ($(KBUILD_EXTMOD),)
463# Additional helpers built in scripts/
464# Carefully list dependencies so we do not try to build scripts twice
465# in parallel
466PHONY += scripts
467scripts: scripts_basic include/config/auto.conf
468 $(Q)$(MAKE) $(build)=$(@)
469
470# Objects we will link into vmlinux / subdirs we need to visit
471init-y := init/
472drivers-y := drivers/ sound/ firmware/
473net-y := net/
474libs-y := lib/
475core-y := usr/
476endif # KBUILD_EXTMOD
477
478ifeq ($(dot-config),1)
479# Read in config
480-include include/config/auto.conf
481
482ifeq ($(KBUILD_EXTMOD),)
483# Read in dependencies to all Kconfig* files, make sure to run
484# oldconfig if changes are detected.
485-include include/config/auto.conf.cmd
486
487# To avoid any implicit rule to kick in, define an empty command
488$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
489
490# If .config is newer than include/config/auto.conf, someone tinkered
491# with it and forgot to run make oldconfig.
492# if auto.conf.cmd is missing then we are probably in a cleaned tree so
493# we execute the config step to be sure to catch updated Kconfig files
494include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
495 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
496else
497# external modules needs include/linux/autoconf.h and include/config/auto.conf
498# but do not care if they are up-to-date. Use auto.conf to trigger the test
499PHONY += include/config/auto.conf
500
501include/config/auto.conf:
502 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
503 echo; \
504 echo " ERROR: Kernel configuration is invalid."; \
505 echo " include/linux/autoconf.h or $@ are missing."; \
506 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
507 echo; \
508 /bin/false)
509
510endif # KBUILD_EXTMOD
511
512else
513# Dummy target needed, because used as prerequisite
514include/config/auto.conf: ;
515endif # $(dot-config)
516
517# The all: target is the default when no target is given on the
518# command line.
519# This allow a user to issue only 'make' to build a kernel including modules
520# Defaults vmlinux but it is usually overridden in the arch makefile
521all: vmlinux
522
523ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
524KBUILD_CFLAGS += -Os
525else
526KBUILD_CFLAGS += -O2
527endif
528
529include $(srctree)/arch/$(SRCARCH)/Makefile
530
531ifneq ($(CONFIG_FRAME_WARN),0)
532KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
533endif
534
535# Force gcc to behave correct even for buggy distributions
536ifndef CONFIG_CC_STACKPROTECTOR
537KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
538endif
539
540ifdef CONFIG_FRAME_POINTER
541KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
542else
543KBUILD_CFLAGS += -fomit-frame-pointer
544endif
545
546ifdef CONFIG_DEBUG_INFO
547KBUILD_CFLAGS += -g
548KBUILD_AFLAGS += -gdwarf-2
549endif
550
551ifdef CONFIG_FUNCTION_TRACER
552KBUILD_CFLAGS += -pg
553endif
554
555# We trigger additional mismatches with less inlining
556ifdef CONFIG_DEBUG_SECTION_MISMATCH
557KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
558endif
559
560# arch Makefile may override CC so keep this after arch Makefile is included
561NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
562CHECKFLAGS += $(NOSTDINC_FLAGS)
563
564# warn about C99 declaration after statement
565KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
566
567# disable pointer signed / unsigned warnings in gcc 4.0
568KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
569
570# disable invalid "can't wrap" optimizations for signed / pointers
571KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
572
573# revert to pre-gcc-4.4 behaviour of .eh_frame
574KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
575
576# conserve stack if available
577KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
578
579# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
580# But warn user when we do so
581warn-assign = \
582$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
583
584ifneq ($(KCPPFLAGS),)
585 $(call warn-assign,CPPFLAGS)
586 KBUILD_CPPFLAGS += $(KCPPFLAGS)
587endif
588ifneq ($(KAFLAGS),)
589 $(call warn-assign,AFLAGS)
590 KBUILD_AFLAGS += $(KAFLAGS)
591endif
592ifneq ($(KCFLAGS),)
593 $(call warn-assign,CFLAGS)
594 KBUILD_CFLAGS += $(KCFLAGS)
595endif
596
597# Use --build-id when available.
598LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
599 $(call cc-ldoption, -Wl$(comma)--build-id,))
600LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
601LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
602
603ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
604LDFLAGS_vmlinux += $(call ld-option, -X,)
605endif
606
607# Default kernel image to build when no specific target is given.
608# KBUILD_IMAGE may be overruled on the command line or
609# set in the environment
610# Also any assignments in arch/$(ARCH)/Makefile take precedence over
611# this default value
612export KBUILD_IMAGE ?= vmlinux
613
614#
615# INSTALL_PATH specifies where to place the updated kernel and system map
616# images. Default is /boot, but you can set it to other values
617export INSTALL_PATH ?= /boot
618
619#
620# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
621# relocations required by build roots. This is not defined in the
622# makefile but the argument can be passed to make if needed.
623#
624
625MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
626export MODLIB
627
628#
629# INSTALL_MOD_STRIP, if defined, will cause modules to be
630# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
631# the default option --strip-debug will be used. Otherwise,
632# INSTALL_MOD_STRIP will used as the options to the strip command.
633
634ifdef INSTALL_MOD_STRIP
635ifeq ($(INSTALL_MOD_STRIP),1)
636mod_strip_cmd = $(STRIP) --strip-debug
637else
638mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
639endif # INSTALL_MOD_STRIP=1
640else
641mod_strip_cmd = true
642endif # INSTALL_MOD_STRIP
643export mod_strip_cmd
644
645
646ifeq ($(KBUILD_EXTMOD),)
647core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
648
649vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
650 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
651 $(net-y) $(net-m) $(libs-y) $(libs-m)))
652
653vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
654 $(init-n) $(init-) \
655 $(core-n) $(core-) $(drivers-n) $(drivers-) \
656 $(net-n) $(net-) $(libs-n) $(libs-))))
657
658init-y := $(patsubst %/, %/built-in.o, $(init-y))
659core-y := $(patsubst %/, %/built-in.o, $(core-y))
660drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
661net-y := $(patsubst %/, %/built-in.o, $(net-y))
662libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
663libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
664libs-y := $(libs-y1) $(libs-y2)
665
666# Build vmlinux
667# ---------------------------------------------------------------------------
668# vmlinux is built from the objects selected by $(vmlinux-init) and
669# $(vmlinux-main). Most are built-in.o files from top-level directories
670# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
671# Ordering when linking is important, and $(vmlinux-init) must be first.
672#
673# vmlinux
674# ^
675# |
676# +-< $(vmlinux-init)
677# | +--< init/version.o + more
678# |
679# +--< $(vmlinux-main)
680# | +--< driver/built-in.o mm/built-in.o + more
681# |
682# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
683#
684# vmlinux version (uname -v) cannot be updated during normal
685# descending-into-subdirs phase since we do not yet know if we need to
686# update vmlinux.
687# Therefore this step is delayed until just before final link of vmlinux -
688# except in the kallsyms case where it is done just before adding the
689# symbols to the kernel.
690#
691# System.map is generated to document addresses of all kernel symbols
692
693vmlinux-init := $(head-y) $(init-y)
694vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
695vmlinux-all := $(vmlinux-init) $(vmlinux-main)
696vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
697export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
698
699# Rule to link vmlinux - also used during CONFIG_KALLSYMS
700# May be overridden by arch/$(ARCH)/Makefile
701quiet_cmd_vmlinux__ ?= LD $@
702 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
703 -T $(vmlinux-lds) $(vmlinux-init) \
704 --start-group $(vmlinux-main) --end-group \
705 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
706
707# Generate new vmlinux version
708quiet_cmd_vmlinux_version = GEN .version
709 cmd_vmlinux_version = set -e; \
710 if [ ! -r .version ]; then \
711 rm -f .version; \
712 echo 1 >.version; \
713 else \
714 mv .version .old_version; \
715 expr 0$$(cat .old_version) + 1 >.version; \
716 fi; \
717 $(MAKE) $(build)=init
718
719# Generate System.map
720quiet_cmd_sysmap = SYSMAP
721 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
722
723# Link of vmlinux
724# If CONFIG_KALLSYMS is set .version is already updated
725# Generate System.map and verify that the content is consistent
726# Use + in front of the vmlinux_version rule to silent warning with make -j2
727# First command is ':' to allow us to use + in front of the rule
728define rule_vmlinux__
729 :
730 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
731
732 $(call cmd,vmlinux__)
733 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
734
735 $(Q)$(if $($(quiet)cmd_sysmap), \
736 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
737 $(cmd_sysmap) $@ System.map; \
738 if [ $$? -ne 0 ]; then \
739 rm -f $@; \
740 /bin/false; \
741 fi;
742 $(verify_kallsyms)
743endef
744
745
746ifdef CONFIG_KALLSYMS
747# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
748# It's a three stage process:
749# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
750# empty
751# Running kallsyms on that gives us .tmp_kallsyms1.o with
752# the right size - vmlinux version (uname -v) is updated during this step
753# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
754# but due to the added section, some addresses have shifted.
755# From here, we generate a correct .tmp_kallsyms2.o
756# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
757# o Verify that the System.map from vmlinux matches the map from
758# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
759# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
760# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
761# temporary bypass to allow the kernel to be built while the
762# maintainers work out what went wrong with kallsyms.
763
764ifdef CONFIG_KALLSYMS_EXTRA_PASS
765last_kallsyms := 3
766else
767last_kallsyms := 2
768endif
769
770kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
771
772define verify_kallsyms
773 $(Q)$(if $($(quiet)cmd_sysmap), \
774 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
775 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
776 $(Q)cmp -s System.map .tmp_System.map || \
777 (echo Inconsistent kallsyms data; \
778 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
779 rm .tmp_kallsyms* ; /bin/false )
780endef
781
782# Update vmlinux version before link
783# Use + in front of this rule to silent warning about make -j1
784# First command is ':' to allow us to use + in front of this rule
785cmd_ksym_ld = $(cmd_vmlinux__)
786define rule_ksym_ld
787 :
788 +$(call cmd,vmlinux_version)
789 $(call cmd,vmlinux__)
790 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
791endef
792
793# Generate .S file with all kernel symbols
794quiet_cmd_kallsyms = KSYM $@
795 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
796 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
797
798.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
799 $(call if_changed_dep,as_o_S)
800
801.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
802 $(call cmd,kallsyms)
803
804# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
805.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
806 $(call if_changed_rule,ksym_ld)
807
808.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
809 $(call if_changed,vmlinux__)
810
811.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
812 $(call if_changed,vmlinux__)
813
814# Needs to visit scripts/ before $(KALLSYMS) can be used.
815$(KALLSYMS): scripts ;
816
817# Generate some data for debugging strange kallsyms problems
818debug_kallsyms: .tmp_map$(last_kallsyms)
819
820.tmp_map%: .tmp_vmlinux% FORCE
821 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
822
823.tmp_map3: .tmp_map2
824
825.tmp_map2: .tmp_map1
826
827endif # ifdef CONFIG_KALLSYMS
828
829# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
830# relevant sections renamed as per the linker script.
831quiet_cmd_vmlinux-modpost = LD $@
832 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
833 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
834 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
835define rule_vmlinux-modpost
836 :
837 +$(call cmd,vmlinux-modpost)
838 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
839 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
840endef
841
842# vmlinux image - including updated kernel symbols
843vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
844ifdef CONFIG_HEADERS_CHECK
845 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
846endif
847ifdef CONFIG_SAMPLES
848 $(Q)$(MAKE) $(build)=samples
849endif
850ifdef CONFIG_BUILD_DOCSRC
851 $(Q)$(MAKE) $(build)=Documentation
852endif
853 $(call vmlinux-modpost)
854 $(call if_changed_rule,vmlinux__)
855 $(Q)rm -f .old_version
856
857# build vmlinux.o first to catch section mismatch errors early
858ifdef CONFIG_KALLSYMS
859.tmp_vmlinux1: vmlinux.o
860endif
861
862modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
863vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
864 $(call if_changed_rule,vmlinux-modpost)
865
866# The actual objects are generated when descending,
867# make sure no implicit rule kicks in
868$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
869
870# Handle descending into subdirectories listed in $(vmlinux-dirs)
871# Preset locale variables to speed up the build process. Limit locale
872# tweaks to this spot to avoid wrong language settings when running
873# make menuconfig etc.
874# Error messages still appears in the original language
875
876PHONY += $(vmlinux-dirs)
877$(vmlinux-dirs): prepare scripts
878 $(Q)$(MAKE) $(build)=$@
879
880# Build the kernel release string
881#
882# The KERNELRELEASE value built here is stored in the file
883# include/config/kernel.release, and is used when executing several
884# make targets, such as "make install" or "make modules_install."
885#
886# The eventual kernel release string consists of the following fields,
887# shown in a hierarchical format to show how smaller parts are concatenated
888# to form the larger and final value, with values coming from places like
889# the Makefile, kernel config options, make command line options and/or
890# SCM tag information.
891#
892# $(KERNELVERSION)
893# $(VERSION) eg, 2
894# $(PATCHLEVEL) eg, 6
895# $(SUBLEVEL) eg, 18
896# $(EXTRAVERSION) eg, -rc6
897# $(localver-full)
898# $(localver)
899# localversion* (files without backups, containing '~')
900# $(CONFIG_LOCALVERSION) (from kernel config setting)
901# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
902# ./scripts/setlocalversion (SCM tag, if one exists)
903# $(LOCALVERSION) (from make command line if provided)
904#
905# Note how the final $(localver-auto) string is included *only* if the
906# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
907# moment, only git is supported but other SCMs can edit the script
908# scripts/setlocalversion and add the appropriate checks as needed.
909
910pattern = ".*/localversion[^~]*"
911string = $(shell cat /dev/null \
912 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
913
914localver = $(subst $(space),, $(string) \
915 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
916
917# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
918# and if the SCM is know a tag from the SCM is appended.
919# The appended tag is determined by the SCM used.
920#
921# .scmversion is used when generating rpm packages so we do not loose
922# the version information from the SCM when we do the build of the kernel
923# from the copied source
924ifdef CONFIG_LOCALVERSION_AUTO
925
926ifeq ($(wildcard .scmversion),)
927 _localver-auto = $(shell $(CONFIG_SHELL) \
928 $(srctree)/scripts/setlocalversion $(srctree))
929else
930 _localver-auto = $(shell cat .scmversion 2> /dev/null)
931endif
932
933 localver-auto = $(LOCALVERSION)$(_localver-auto)
934endif
935
936localver-full = $(localver)$(localver-auto)
937
938# Store (new) KERNELRELASE string in include/config/kernel.release
939kernelrelease = $(KERNELVERSION)$(localver-full)
940include/config/kernel.release: include/config/auto.conf FORCE
941 $(Q)rm -f $@
942 $(Q)echo $(kernelrelease) > $@
943
944
945# Things we need to do before we recursively start building the kernel
946# or the modules are listed in "prepare".
947# A multi level approach is used. prepareN is processed before prepareN-1.
948# archprepare is used in arch Makefiles and when processed asm symlink,
949# version.h and scripts_basic is processed / created.
950
951# Listed in dependency order
952PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
953
954# prepare3 is used to check if we are building in a separate output directory,
955# and if so do:
956# 1) Check that make has not been executed in the kernel src $(srctree)
957# 2) Create the include2 directory, used for the second asm symlink
958prepare3: include/config/kernel.release
959ifneq ($(KBUILD_SRC),)
960 @$(kecho) ' Using $(srctree) as source for kernel'
961 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
962 echo " $(srctree) is not clean, please run 'make mrproper'";\
963 echo " in the '$(srctree)' directory.";\
964 /bin/false; \
965 fi;
966 $(Q)if [ ! -d include2 ]; then \
967 mkdir -p include2; \
968 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
969 fi
970endif
971
972# prepare2 creates a makefile if using a separate output directory
973prepare2: prepare3 outputmakefile
974
975prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
976 include/asm include/config/auto.conf
977 $(cmd_crmodverdir)
978
979archprepare: prepare1 scripts_basic
980
981prepare0: archprepare FORCE
982 $(Q)$(MAKE) $(build)=.
983 $(Q)$(MAKE) $(build)=. missing-syscalls
984
985# All the preparing..
986prepare: prepare0
987
988# The asm symlink changes when $(ARCH) changes.
989# Detect this and ask user to run make mrproper
990# If asm is a stale symlink (point to dir that does not exist) remove it
991define check-symlink
992 set -e; \
993 if [ -L include/asm ]; then \
994 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
995 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
996 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
997 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
998 exit 1; \
999 fi; \
1000 test -e $$asmlink || rm include/asm; \
1001 elif [ -d include/asm ]; then \
1002 echo "ERROR: $@ is a directory but a symlink was expected";\
1003 exit 1; \
1004 fi
1005endef
1006
1007# We create the target directory of the symlink if it does
1008# not exist so the test in check-symlink works and we have a
1009# directory for generated filesas used by some architectures.
1010define create-symlink
1011 if [ ! -L include/asm ]; then \
1012 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1013 if [ ! -d include/asm-$(SRCARCH) ]; then \
1014 mkdir -p include/asm-$(SRCARCH); \
1015 fi; \
1016 ln -fsn asm-$(SRCARCH) $@; \
1017 fi
1018endef
1019
1020include/asm: FORCE
1021 $(Q)$(check-symlink)
1022 $(Q)$(create-symlink)
1023
1024# Generate some files
1025# ---------------------------------------------------------------------------
1026
1027# KERNELRELEASE can change from a few different places, meaning version.h
1028# needs to be updated, so this check is forced on all builds
1029
1030uts_len := 64
1031define filechk_utsrelease.h
1032 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1033 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1034 exit 1; \
1035 fi; \
1036 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1037endef
1038
1039define filechk_version.h
1040 (echo \#define LINUX_VERSION_CODE $(shell \
1041 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1042 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1043endef
1044
1045include/linux/version.h: $(srctree)/Makefile FORCE
1046 $(call filechk,version.h)
1047
1048include/linux/utsrelease.h: include/config/kernel.release FORCE
1049 $(call filechk,utsrelease.h)
1050
1051PHONY += headerdep
1052headerdep:
1053 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1054
1055# ---------------------------------------------------------------------------
1056
1057PHONY += depend dep
1058depend dep:
1059 @echo '*** Warning: make $@ is unnecessary now.'
1060
1061# ---------------------------------------------------------------------------
1062# Firmware install
1063INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1064export INSTALL_FW_PATH
1065
1066PHONY += firmware_install
1067firmware_install: FORCE
1068 @mkdir -p $(objtree)/firmware
1069 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1070
1071# ---------------------------------------------------------------------------
1072# Kernel headers
1073
1074#Default location for installed headers
1075export INSTALL_HDR_PATH = $(objtree)/usr
1076
1077hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1078# Find out where the Kbuild file is located to support
1079# arch/$(ARCH)/include/asm
1080hdr-dir = $(strip \
1081 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1082 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1083
1084# If we do an all arch process set dst to asm-$(hdr-arch)
1085hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1086
1087PHONY += __headers
1088__headers: include/linux/version.h scripts_basic FORCE
1089 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1090
1091PHONY += headers_install_all
1092headers_install_all:
1093 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1094
1095PHONY += headers_install
1096headers_install: __headers
1097 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1098 $(error Headers not exportable for the $(SRCARCH) architecture))
1099 $(Q)$(MAKE) $(hdr-inst)=include
1100 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1101
1102PHONY += headers_check_all
1103headers_check_all: headers_install_all
1104 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1105
1106PHONY += headers_check
1107headers_check: headers_install
1108 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1109 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1110
1111# ---------------------------------------------------------------------------
1112# Modules
1113
1114ifdef CONFIG_MODULES
1115
1116# By default, build modules as well
1117
1118all: modules
1119
1120# Build modules
1121#
1122# A module can be listed more than once in obj-m resulting in
1123# duplicate lines in modules.order files. Those are removed
1124# using awk while concatenating to the final file.
1125
1126PHONY += modules
1127modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1128 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1129 @$(kecho) ' Building modules, stage 2.';
1130 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1131 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1132
1133
1134# Target to prepare building external modules
1135PHONY += modules_prepare
1136modules_prepare: prepare scripts
1137
1138# Target to install modules
1139PHONY += modules_install
1140modules_install: _modinst_ _modinst_post
1141
1142PHONY += _modinst_
1143_modinst_:
1144 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1145 echo "Warning: you may need to install module-init-tools"; \
1146 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1147 sleep 1; \
1148 fi
1149 @rm -rf $(MODLIB)/kernel
1150 @rm -f $(MODLIB)/source
1151 @mkdir -p $(MODLIB)/kernel
1152 @ln -s $(srctree) $(MODLIB)/source
1153 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1154 rm -f $(MODLIB)/build ; \
1155 ln -s $(objtree) $(MODLIB)/build ; \
1156 fi
1157 @cp -f $(objtree)/modules.order $(MODLIB)/
1158 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1159
1160# This depmod is only for convenience to give the initial
1161# boot a modules.dep even before / is mounted read-write. However the
1162# boot script depmod is the master version.
1163PHONY += _modinst_post
1164_modinst_post: _modinst_
1165 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1166 $(call cmd,depmod)
1167
1168else # CONFIG_MODULES
1169
1170# Modules not configured
1171# ---------------------------------------------------------------------------
1172
1173modules modules_install: FORCE
1174 @echo
1175 @echo "The present kernel configuration has modules disabled."
1176 @echo "Type 'make config' and enable loadable module support."
1177 @echo "Then build a kernel with module support enabled."
1178 @echo
1179 @exit 1
1180
1181endif # CONFIG_MODULES
1182
1183###
1184# Cleaning is done on three levels.
1185# make clean Delete most generated files
1186# Leave enough to build external modules
1187# make mrproper Delete the current configuration, and all generated files
1188# make distclean Remove editor backup files, patch leftover files and the like
1189
1190# Directories & files removed with 'make clean'
1191CLEAN_DIRS += $(MODVERDIR)
1192CLEAN_FILES += vmlinux System.map \
1193 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1194
1195# Directories & files removed with 'make mrproper'
1196MRPROPER_DIRS += include/config include2 usr/include include/generated
1197MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1198 include/linux/autoconf.h include/linux/version.h \
1199 include/linux/utsrelease.h \
1200 include/linux/bounds.h include/asm*/asm-offsets.h \
1201 Module.symvers Module.markers tags TAGS cscope*
1202
1203# clean - Delete most, but leave enough to build external modules
1204#
1205clean: rm-dirs := $(CLEAN_DIRS)
1206clean: rm-files := $(CLEAN_FILES)
1207clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1208
1209PHONY += $(clean-dirs) clean archclean
1210$(clean-dirs):
1211 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1212
1213clean: archclean $(clean-dirs)
1214 $(call cmd,rmdirs)
1215 $(call cmd,rmfiles)
1216 @find . $(RCS_FIND_IGNORE) \
1217 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1218 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1219 -o -name '*.symtypes' -o -name 'modules.order' \
1220 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1221 -o -name '*.gcno' \) -type f -print | xargs rm -f
1222
1223# mrproper - Delete all generated files, including .config
1224#
1225mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1226mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1227mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1228
1229PHONY += $(mrproper-dirs) mrproper archmrproper
1230$(mrproper-dirs):
1231 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1232
1233mrproper: clean archmrproper $(mrproper-dirs)
1234 $(call cmd,rmdirs)
1235 $(call cmd,rmfiles)
1236
1237# distclean
1238#
1239PHONY += distclean
1240
1241distclean: mrproper
1242 @find $(srctree) $(RCS_FIND_IGNORE) \
1243 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1244 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1245 -o -name '.*.rej' -o -size 0 \
1246 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1247 -type f -print | xargs rm -f
1248
1249
1250# Packaging of the kernel to various formats
1251# ---------------------------------------------------------------------------
1252# rpm target kept for backward compatibility
1253package-dir := $(srctree)/scripts/package
1254
1255%pkg: include/config/kernel.release FORCE
1256 $(Q)$(MAKE) $(build)=$(package-dir) $@
1257rpm: include/config/kernel.release FORCE
1258 $(Q)$(MAKE) $(build)=$(package-dir) $@
1259
1260
1261# Brief documentation of the typical targets used
1262# ---------------------------------------------------------------------------
1263
1264boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1265boards := $(notdir $(boards))
1266board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1267board-dirs := $(sort $(notdir $(board-dirs:/=)))
1268
1269help:
1270 @echo 'Cleaning targets:'
1271 @echo ' clean - Remove most generated files but keep the config and'
1272 @echo ' enough build support to build external modules'
1273 @echo ' mrproper - Remove all generated files + config + various backup files'
1274 @echo ' distclean - mrproper + remove editor backup and patch files'
1275 @echo ''
1276 @echo 'Configuration targets:'
1277 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1278 @echo ''
1279 @echo 'Other generic targets:'
1280 @echo ' all - Build all targets marked with [*]'
1281 @echo '* vmlinux - Build the bare kernel'
1282 @echo '* modules - Build all modules'
1283 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1284 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1285 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1286 @echo ' dir/ - Build all files in dir and below'
1287 @echo ' dir/file.[ois] - Build specified target only'
1288 @echo ' dir/file.ko - Build module including final link'
1289 @echo ' modules_prepare - Set up for building external modules'
1290 @echo ' tags/TAGS - Generate tags file for editors'
1291 @echo ' cscope - Generate cscope index'
1292 @echo ' kernelrelease - Output the release version string'
1293 @echo ' kernelversion - Output the version stored in Makefile'
1294 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1295 echo ' (default: $(INSTALL_HDR_PATH))'; \
1296 echo ''
1297 @echo 'Static analysers'
1298 @echo ' checkstack - Generate a list of stack hogs'
1299 @echo ' namespacecheck - Name space analysis on compiled kernel'
1300 @echo ' versioncheck - Sanity check on version.h usage'
1301 @echo ' includecheck - Check for duplicate included header files'
1302 @echo ' export_report - List the usages of all exported symbols'
1303 @echo ' headers_check - Sanity check on exported headers'
1304 @echo ' headerdep - Detect inclusion cycles in headers'; \
1305 echo ''
1306 @echo 'Kernel packaging:'
1307 @$(MAKE) $(build)=$(package-dir) help
1308 @echo ''
1309 @echo 'Documentation targets:'
1310 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1311 @echo ''
1312 @echo 'Architecture specific targets ($(SRCARCH)):'
1313 @$(if $(archhelp),$(archhelp),\
1314 echo ' No architecture specific help defined for $(SRCARCH)')
1315 @echo ''
1316 @$(if $(boards), \
1317 $(foreach b, $(boards), \
1318 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1319 echo '')
1320 @$(if $(board-dirs), \
1321 $(foreach b, $(board-dirs), \
1322 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1323 printf " %-16s - Show all of the above\\n" help-boards; \
1324 echo '')
1325
1326 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1327 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1328 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1329 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1330 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1331 @echo ''
1332 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1333 @echo 'For further info see the ./README file'
1334
1335
1336help-board-dirs := $(addprefix help-,$(board-dirs))
1337
1338help-boards: $(help-board-dirs)
1339
1340boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1341
1342$(help-board-dirs): help-%:
1343 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1344 @$(if $(boards-per-dir), \
1345 $(foreach b, $(boards-per-dir), \
1346 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1347 echo '')
1348
1349
1350# Documentation targets
1351# ---------------------------------------------------------------------------
1352%docs: scripts_basic FORCE
1353 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1354
1355else # KBUILD_EXTMOD
1356
1357###
1358# External module support.
1359# When building external modules the kernel used as basis is considered
1360# read-only, and no consistency checks are made and the make
1361# system is not used on the basis kernel. If updates are required
1362# in the basis kernel ordinary make commands (without M=...) must
1363# be used.
1364#
1365# The following are the only valid targets when building external
1366# modules.
1367# make M=dir clean Delete all automatically generated files
1368# make M=dir modules Make all modules in specified dir
1369# make M=dir Same as 'make M=dir modules'
1370# make M=dir modules_install
1371# Install the modules built in the module directory
1372# Assumes install directory is already created
1373
1374# We are always building modules
1375KBUILD_MODULES := 1
1376PHONY += crmodverdir
1377crmodverdir:
1378 $(cmd_crmodverdir)
1379
1380PHONY += $(objtree)/Module.symvers
1381$(objtree)/Module.symvers:
1382 @test -e $(objtree)/Module.symvers || ( \
1383 echo; \
1384 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1385 echo " is missing; modules will have no dependencies and modversions."; \
1386 echo )
1387
1388module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1389PHONY += $(module-dirs) modules
1390$(module-dirs): crmodverdir $(objtree)/Module.symvers
1391 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1392
1393modules: $(module-dirs)
1394 @$(kecho) ' Building modules, stage 2.';
1395 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1396
1397PHONY += modules_install
1398modules_install: _emodinst_ _emodinst_post
1399
1400install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1401PHONY += _emodinst_
1402_emodinst_:
1403 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1404 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1405
1406PHONY += _emodinst_post
1407_emodinst_post: _emodinst_
1408 $(call cmd,depmod)
1409
1410clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1411
1412PHONY += $(clean-dirs) clean
1413$(clean-dirs):
1414 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1415
1416clean: rm-dirs := $(MODVERDIR)
1417clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1418 $(KBUILD_EXTMOD)/Module.markers \
1419 $(KBUILD_EXTMOD)/modules.order
1420clean: $(clean-dirs)
1421 $(call cmd,rmdirs)
1422 $(call cmd,rmfiles)
1423 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1424 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1425 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1426 -o -name '*.gcno' \) -type f -print | xargs rm -f
1427
1428help:
1429 @echo ' Building external modules.'
1430 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1431 @echo ''
1432 @echo ' modules - default target, build the module(s)'
1433 @echo ' modules_install - install the module'
1434 @echo ' clean - remove generated files in module directory only'
1435 @echo ''
1436
1437# Dummies...
1438PHONY += prepare scripts
1439prepare: ;
1440scripts: ;
1441endif # KBUILD_EXTMOD
1442
1443# Generate tags for editors
1444# ---------------------------------------------------------------------------
1445quiet_cmd_tags = GEN $@
1446 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1447
1448tags TAGS cscope: FORCE
1449 $(call cmd,tags)
1450
1451# Scripts to check various things for consistency
1452# ---------------------------------------------------------------------------
1453
1454includecheck:
1455 find * $(RCS_FIND_IGNORE) \
1456 -name '*.[hcS]' -type f -print | sort \
1457 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1458
1459versioncheck:
1460 find * $(RCS_FIND_IGNORE) \
1461 -name '*.[hcS]' -type f -print | sort \
1462 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1463
1464namespacecheck:
1465 $(PERL) $(srctree)/scripts/namespace.pl
1466
1467export_report:
1468 $(PERL) $(srctree)/scripts/export_report.pl
1469
1470endif #ifeq ($(config-targets),1)
1471endif #ifeq ($(mixed-targets),1)
1472
1473PHONY += checkstack kernelrelease kernelversion
1474
1475# UML needs a little special treatment here. It wants to use the host
1476# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1477# else wants $(ARCH), including people doing cross-builds, which means
1478# that $(SUBARCH) doesn't work here.
1479ifeq ($(ARCH), um)
1480CHECKSTACK_ARCH := $(SUBARCH)
1481else
1482CHECKSTACK_ARCH := $(ARCH)
1483endif
1484checkstack:
1485 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1486 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1487
1488kernelrelease:
1489 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1490 $(error kernelrelease not valid - run 'make prepare' to update it))
1491kernelversion:
1492 @echo $(KERNELVERSION)
1493
1494# Single targets
1495# ---------------------------------------------------------------------------
1496# Single targets are compatible with:
1497# - build with mixed source and output
1498# - build with separate output dir 'make O=...'
1499# - external modules
1500#
1501# target-dir => where to store outputfile
1502# build-dir => directory in kernel source tree to use
1503
1504ifeq ($(KBUILD_EXTMOD),)
1505 build-dir = $(patsubst %/,%,$(dir $@))
1506 target-dir = $(dir $@)
1507else
1508 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1509 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1510 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1511endif
1512
1513%.s: %.c prepare scripts FORCE
1514 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515%.i: %.c prepare scripts FORCE
1516 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517%.o: %.c prepare scripts FORCE
1518 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519%.lst: %.c prepare scripts FORCE
1520 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521%.s: %.S prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523%.o: %.S prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.symtypes: %.c prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527
1528# Modules
1529/: prepare scripts FORCE
1530 $(cmd_crmodverdir)
1531 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1532 $(build)=$(build-dir)
1533%/: prepare scripts FORCE
1534 $(cmd_crmodverdir)
1535 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1536 $(build)=$(build-dir)
1537%.ko: prepare scripts FORCE
1538 $(cmd_crmodverdir)
1539 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540 $(build)=$(build-dir) $(@:.ko=.o)
1541 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1542
1543# FIXME Should go into a make.lib or something
1544# ===========================================================================
1545
1546quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1547 cmd_rmdirs = rm -rf $(rm-dirs)
1548
1549quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1550 cmd_rmfiles = rm -f $(rm-files)
1551
1552# Run depmod only if we have System.map and depmod is executable
1553quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1554 cmd_depmod = \
1555 if [ -r System.map -a -x $(DEPMOD) ]; then \
1556 $(DEPMOD) -ae -F System.map \
1557 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1558 $(KERNELRELEASE); \
1559 fi
1560
1561# Create temporary dir for module support files
1562# clean it up only when building all modules
1563cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1564 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1565
1566a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1567 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1568 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1569
1570quiet_cmd_as_o_S = AS $@
1571cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1572
1573# read all saved command lines
1574
1575targets := $(wildcard $(sort $(targets)))
1576cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1577
1578ifneq ($(cmd_files),)
1579 $(cmd_files): ; # Do not try to update included dependency files
1580 include $(cmd_files)
1581endif
1582
1583# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1584# Usage:
1585# $(Q)$(MAKE) $(clean)=dir
1586clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1587
1588endif # skip-makefile
1589
1590PHONY += FORCE
1591FORCE:
1592
1593# Declare the contents of the .PHONY variable as phony. We keep that
1594# information in a variable so we can use it in if_changed and friends.
1595.PHONY: $(PHONY)