Root/Makefile

1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 32
4EXTRAVERSION = .10
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 -fno-reorder-blocks -fno-tree-ch
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# improve gcc optimization
565CFLAGS += $(call cc-option,-funit-at-a-time,)
566
567# warn about C99 declaration after statement
568KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
569
570# disable pointer signed / unsigned warnings in gcc 4.0
571KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
572
573# disable invalid "can't wrap" optimizations for signed / pointers
574KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
575
576# revert to pre-gcc-4.4 behaviour of .eh_frame
577KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
578
579# conserve stack if available
580KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
581
582# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
583# But warn user when we do so
584warn-assign = \
585$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
586
587ifneq ($(KCPPFLAGS),)
588        $(call warn-assign,CPPFLAGS)
589        KBUILD_CPPFLAGS += $(KCPPFLAGS)
590endif
591ifneq ($(KAFLAGS),)
592        $(call warn-assign,AFLAGS)
593        KBUILD_AFLAGS += $(KAFLAGS)
594endif
595ifneq ($(KCFLAGS),)
596        $(call warn-assign,CFLAGS)
597        KBUILD_CFLAGS += $(KCFLAGS)
598endif
599
600# Use --build-id when available.
601LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
602                  $(call cc-ldoption, -Wl$(comma)--build-id,))
603LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
604LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
605
606ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
607LDFLAGS_vmlinux += $(call ld-option, -X,)
608endif
609
610# Default kernel image to build when no specific target is given.
611# KBUILD_IMAGE may be overruled on the command line or
612# set in the environment
613# Also any assignments in arch/$(ARCH)/Makefile take precedence over
614# this default value
615export KBUILD_IMAGE ?= vmlinux
616
617#
618# INSTALL_PATH specifies where to place the updated kernel and system map
619# images. Default is /boot, but you can set it to other values
620export INSTALL_PATH ?= /boot
621
622#
623# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
624# relocations required by build roots. This is not defined in the
625# makefile but the argument can be passed to make if needed.
626#
627
628MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
629export MODLIB
630
631#
632# INSTALL_MOD_STRIP, if defined, will cause modules to be
633# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
634# the default option --strip-debug will be used. Otherwise,
635# INSTALL_MOD_STRIP will used as the options to the strip command.
636
637ifdef INSTALL_MOD_STRIP
638ifeq ($(INSTALL_MOD_STRIP),1)
639mod_strip_cmd = $(STRIP) --strip-debug
640else
641mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
642endif # INSTALL_MOD_STRIP=1
643else
644mod_strip_cmd = true
645endif # INSTALL_MOD_STRIP
646export mod_strip_cmd
647
648
649ifeq ($(KBUILD_EXTMOD),)
650core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
651
652vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
653             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
654             $(net-y) $(net-m) $(libs-y) $(libs-m)))
655
656vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
657             $(init-n) $(init-) \
658             $(core-n) $(core-) $(drivers-n) $(drivers-) \
659             $(net-n) $(net-) $(libs-n) $(libs-))))
660
661init-y := $(patsubst %/, %/built-in.o, $(init-y))
662core-y := $(patsubst %/, %/built-in.o, $(core-y))
663drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
664net-y := $(patsubst %/, %/built-in.o, $(net-y))
665libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
666libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
667libs-y := $(libs-y1) $(libs-y2)
668
669# Build vmlinux
670# ---------------------------------------------------------------------------
671# vmlinux is built from the objects selected by $(vmlinux-init) and
672# $(vmlinux-main). Most are built-in.o files from top-level directories
673# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
674# Ordering when linking is important, and $(vmlinux-init) must be first.
675#
676# vmlinux
677# ^
678# |
679# +-< $(vmlinux-init)
680# | +--< init/version.o + more
681# |
682# +--< $(vmlinux-main)
683# | +--< driver/built-in.o mm/built-in.o + more
684# |
685# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
686#
687# vmlinux version (uname -v) cannot be updated during normal
688# descending-into-subdirs phase since we do not yet know if we need to
689# update vmlinux.
690# Therefore this step is delayed until just before final link of vmlinux -
691# except in the kallsyms case where it is done just before adding the
692# symbols to the kernel.
693#
694# System.map is generated to document addresses of all kernel symbols
695
696vmlinux-init := $(head-y) $(init-y)
697vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
698vmlinux-all := $(vmlinux-init) $(vmlinux-main)
699vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
700export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
701
702# Rule to link vmlinux - also used during CONFIG_KALLSYMS
703# May be overridden by arch/$(ARCH)/Makefile
704quiet_cmd_vmlinux__ ?= LD $@
705      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
706      -T $(vmlinux-lds) $(vmlinux-init) \
707      --start-group $(vmlinux-main) --end-group \
708      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
709
710# Generate new vmlinux version
711quiet_cmd_vmlinux_version = GEN .version
712      cmd_vmlinux_version = set -e; \
713    if [ ! -r .version ]; then \
714      rm -f .version; \
715      echo 1 >.version; \
716    else \
717      mv .version .old_version; \
718      expr 0$$(cat .old_version) + 1 >.version; \
719    fi; \
720    $(MAKE) $(build)=init
721
722# Generate System.map
723quiet_cmd_sysmap = SYSMAP
724      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
725
726# Link of vmlinux
727# If CONFIG_KALLSYMS is set .version is already updated
728# Generate System.map and verify that the content is consistent
729# Use + in front of the vmlinux_version rule to silent warning with make -j2
730# First command is ':' to allow us to use + in front of the rule
731define rule_vmlinux__
732    :
733    $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
734
735    $(call cmd,vmlinux__)
736    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
737
738    $(Q)$(if $($(quiet)cmd_sysmap), \
739      echo ' $($(quiet)cmd_sysmap) System.map' &&) \
740    $(cmd_sysmap) $@ System.map; \
741    if [ $$? -ne 0 ]; then \
742        rm -f $@; \
743        /bin/false; \
744    fi;
745    $(verify_kallsyms)
746endef
747
748
749ifdef CONFIG_KALLSYMS
750# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
751# It's a three stage process:
752# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
753# empty
754# Running kallsyms on that gives us .tmp_kallsyms1.o with
755# the right size - vmlinux version (uname -v) is updated during this step
756# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
757# but due to the added section, some addresses have shifted.
758# From here, we generate a correct .tmp_kallsyms2.o
759# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
760# o Verify that the System.map from vmlinux matches the map from
761# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
762# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
763# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
764# temporary bypass to allow the kernel to be built while the
765# maintainers work out what went wrong with kallsyms.
766
767ifdef CONFIG_KALLSYMS_EXTRA_PASS
768last_kallsyms := 3
769else
770last_kallsyms := 2
771endif
772
773kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
774
775define verify_kallsyms
776    $(Q)$(if $($(quiet)cmd_sysmap), \
777      echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
778      $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
779    $(Q)cmp -s System.map .tmp_System.map || \
780        (echo Inconsistent kallsyms data; \
781         echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
782         rm .tmp_kallsyms* ; /bin/false )
783endef
784
785# Update vmlinux version before link
786# Use + in front of this rule to silent warning about make -j1
787# First command is ':' to allow us to use + in front of this rule
788cmd_ksym_ld = $(cmd_vmlinux__)
789define rule_ksym_ld
790    :
791    +$(call cmd,vmlinux_version)
792    $(call cmd,vmlinux__)
793    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
794endef
795
796# Generate .S file with all kernel symbols
797quiet_cmd_kallsyms = KSYM $@
798      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
799                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
800
801.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
802    $(call if_changed_dep,as_o_S)
803
804.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
805    $(call cmd,kallsyms)
806
807# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
808.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
809    $(call if_changed_rule,ksym_ld)
810
811.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
812    $(call if_changed,vmlinux__)
813
814.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
815    $(call if_changed,vmlinux__)
816
817# Needs to visit scripts/ before $(KALLSYMS) can be used.
818$(KALLSYMS): scripts ;
819
820# Generate some data for debugging strange kallsyms problems
821debug_kallsyms: .tmp_map$(last_kallsyms)
822
823.tmp_map%: .tmp_vmlinux% FORCE
824    ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
825
826.tmp_map3: .tmp_map2
827
828.tmp_map2: .tmp_map1
829
830endif # ifdef CONFIG_KALLSYMS
831
832# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
833# relevant sections renamed as per the linker script.
834quiet_cmd_vmlinux-modpost = LD $@
835      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
836     $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
837     $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
838define rule_vmlinux-modpost
839    :
840    +$(call cmd,vmlinux-modpost)
841    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
842    $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
843endef
844
845# vmlinux image - including updated kernel symbols
846vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
847ifdef CONFIG_HEADERS_CHECK
848    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
849endif
850ifdef CONFIG_SAMPLES
851    $(Q)$(MAKE) $(build)=samples
852endif
853ifdef CONFIG_BUILD_DOCSRC
854    $(Q)$(MAKE) $(build)=Documentation
855endif
856    $(call vmlinux-modpost)
857    $(call if_changed_rule,vmlinux__)
858    $(Q)rm -f .old_version
859
860# build vmlinux.o first to catch section mismatch errors early
861ifdef CONFIG_KALLSYMS
862.tmp_vmlinux1: vmlinux.o
863endif
864
865modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
866vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
867    $(call if_changed_rule,vmlinux-modpost)
868
869# The actual objects are generated when descending,
870# make sure no implicit rule kicks in
871$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
872
873# Handle descending into subdirectories listed in $(vmlinux-dirs)
874# Preset locale variables to speed up the build process. Limit locale
875# tweaks to this spot to avoid wrong language settings when running
876# make menuconfig etc.
877# Error messages still appears in the original language
878
879PHONY += $(vmlinux-dirs)
880$(vmlinux-dirs): prepare scripts
881    $(Q)$(MAKE) $(build)=$@
882
883# Build the kernel release string
884#
885# The KERNELRELEASE value built here is stored in the file
886# include/config/kernel.release, and is used when executing several
887# make targets, such as "make install" or "make modules_install."
888#
889# The eventual kernel release string consists of the following fields,
890# shown in a hierarchical format to show how smaller parts are concatenated
891# to form the larger and final value, with values coming from places like
892# the Makefile, kernel config options, make command line options and/or
893# SCM tag information.
894#
895# $(KERNELVERSION)
896# $(VERSION) eg, 2
897# $(PATCHLEVEL) eg, 6
898# $(SUBLEVEL) eg, 18
899# $(EXTRAVERSION) eg, -rc6
900# $(localver-full)
901# $(localver)
902# localversion* (files without backups, containing '~')
903# $(CONFIG_LOCALVERSION) (from kernel config setting)
904# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
905# ./scripts/setlocalversion (SCM tag, if one exists)
906# $(LOCALVERSION) (from make command line if provided)
907#
908# Note how the final $(localver-auto) string is included *only* if the
909# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
910# moment, only git is supported but other SCMs can edit the script
911# scripts/setlocalversion and add the appropriate checks as needed.
912
913pattern = ".*/localversion[^~]*"
914string = $(shell cat /dev/null \
915       `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
916
917localver = $(subst $(space),, $(string) \
918                  $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
919
920# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
921# and if the SCM is know a tag from the SCM is appended.
922# The appended tag is determined by the SCM used.
923#
924# .scmversion is used when generating rpm packages so we do not loose
925# the version information from the SCM when we do the build of the kernel
926# from the copied source
927ifdef CONFIG_LOCALVERSION_AUTO
928
929ifeq ($(wildcard .scmversion),)
930        _localver-auto = $(shell $(CONFIG_SHELL) \
931                         $(srctree)/scripts/setlocalversion $(srctree))
932else
933        _localver-auto = $(shell cat .scmversion 2> /dev/null)
934endif
935
936    localver-auto = $(LOCALVERSION)$(_localver-auto)
937endif
938
939localver-full = $(localver)$(localver-auto)
940
941# Store (new) KERNELRELASE string in include/config/kernel.release
942kernelrelease = $(KERNELVERSION)$(localver-full)
943include/config/kernel.release: include/config/auto.conf FORCE
944    $(Q)rm -f $@
945    $(Q)echo $(kernelrelease) > $@
946
947
948# Things we need to do before we recursively start building the kernel
949# or the modules are listed in "prepare".
950# A multi level approach is used. prepareN is processed before prepareN-1.
951# archprepare is used in arch Makefiles and when processed asm symlink,
952# version.h and scripts_basic is processed / created.
953
954# Listed in dependency order
955PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
956
957# prepare3 is used to check if we are building in a separate output directory,
958# and if so do:
959# 1) Check that make has not been executed in the kernel src $(srctree)
960# 2) Create the include2 directory, used for the second asm symlink
961prepare3: include/config/kernel.release
962ifneq ($(KBUILD_SRC),)
963    @$(kecho) ' Using $(srctree) as source for kernel'
964    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
965        echo " $(srctree) is not clean, please run 'make mrproper'";\
966        echo " in the '$(srctree)' directory.";\
967        /bin/false; \
968    fi;
969    $(Q)if [ ! -d include2 ]; then \
970        mkdir -p include2; \
971        ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
972    fi
973endif
974
975# prepare2 creates a makefile if using a separate output directory
976prepare2: prepare3 outputmakefile
977
978prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
979                   include/asm include/config/auto.conf
980    $(cmd_crmodverdir)
981
982archprepare: prepare1 scripts_basic
983
984prepare0: archprepare FORCE
985    $(Q)$(MAKE) $(build)=.
986    $(Q)$(MAKE) $(build)=. missing-syscalls
987
988# All the preparing..
989prepare: prepare0
990
991# The asm symlink changes when $(ARCH) changes.
992# Detect this and ask user to run make mrproper
993# If asm is a stale symlink (point to dir that does not exist) remove it
994define check-symlink
995    set -e; \
996    if [ -L include/asm ]; then \
997        asmlink=`readlink include/asm | cut -d '-' -f 2`; \
998        if [ "$$asmlink" != "$(SRCARCH)" ]; then \
999            echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1000            echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1001            exit 1; \
1002        fi; \
1003        test -e $$asmlink || rm include/asm; \
1004    elif [ -d include/asm ]; then \
1005        echo "ERROR: $@ is a directory but a symlink was expected";\
1006        exit 1; \
1007    fi
1008endef
1009
1010# We create the target directory of the symlink if it does
1011# not exist so the test in check-symlink works and we have a
1012# directory for generated filesas used by some architectures.
1013define create-symlink
1014    if [ ! -L include/asm ]; then \
1015            $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1016            if [ ! -d include/asm-$(SRCARCH) ]; then \
1017                mkdir -p include/asm-$(SRCARCH); \
1018            fi; \
1019            ln -fsn asm-$(SRCARCH) $@; \
1020    fi
1021endef
1022
1023include/asm: FORCE
1024    $(Q)$(check-symlink)
1025    $(Q)$(create-symlink)
1026
1027# Generate some files
1028# ---------------------------------------------------------------------------
1029
1030# KERNELRELEASE can change from a few different places, meaning version.h
1031# needs to be updated, so this check is forced on all builds
1032
1033uts_len := 64
1034define filechk_utsrelease.h
1035    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1036      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1037      exit 1; \
1038    fi; \
1039    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1040endef
1041
1042define filechk_version.h
1043    (echo \#define LINUX_VERSION_CODE $(shell \
1044    expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1045    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1046endef
1047
1048include/linux/version.h: $(srctree)/Makefile FORCE
1049    $(call filechk,version.h)
1050
1051include/linux/utsrelease.h: include/config/kernel.release FORCE
1052    $(call filechk,utsrelease.h)
1053
1054PHONY += headerdep
1055headerdep:
1056    $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1057
1058# ---------------------------------------------------------------------------
1059
1060PHONY += depend dep
1061depend dep:
1062    @echo '*** Warning: make $@ is unnecessary now.'
1063
1064# ---------------------------------------------------------------------------
1065# Firmware install
1066INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1067export INSTALL_FW_PATH
1068
1069PHONY += firmware_install
1070firmware_install: FORCE
1071    @mkdir -p $(objtree)/firmware
1072    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1073
1074# ---------------------------------------------------------------------------
1075# Kernel headers
1076
1077#Default location for installed headers
1078export INSTALL_HDR_PATH = $(objtree)/usr
1079
1080hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1081# Find out where the Kbuild file is located to support
1082# arch/$(ARCH)/include/asm
1083hdr-dir = $(strip \
1084          $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1085               arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1086
1087# If we do an all arch process set dst to asm-$(hdr-arch)
1088hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1089
1090PHONY += __headers
1091__headers: include/linux/version.h scripts_basic FORCE
1092    $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1093
1094PHONY += headers_install_all
1095headers_install_all:
1096    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1097
1098PHONY += headers_install
1099headers_install: __headers
1100    $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1101    $(error Headers not exportable for the $(SRCARCH) architecture))
1102    $(Q)$(MAKE) $(hdr-inst)=include
1103    $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1104
1105PHONY += headers_check_all
1106headers_check_all: headers_install_all
1107    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1108
1109PHONY += headers_check
1110headers_check: headers_install
1111    $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1112    $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1113
1114# ---------------------------------------------------------------------------
1115# Modules
1116
1117ifdef CONFIG_MODULES
1118
1119# By default, build modules as well
1120
1121all: modules
1122
1123# Build modules
1124#
1125# A module can be listed more than once in obj-m resulting in
1126# duplicate lines in modules.order files. Those are removed
1127# using awk while concatenating to the final file.
1128
1129PHONY += modules
1130modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1131    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1132    @$(kecho) ' Building modules, stage 2.';
1133    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1134    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1135
1136
1137# Target to prepare building external modules
1138PHONY += modules_prepare
1139modules_prepare: prepare scripts
1140
1141# Target to install modules
1142PHONY += modules_install
1143modules_install: _modinst_ _modinst_post
1144
1145PHONY += _modinst_
1146_modinst_:
1147    @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1148        echo "Warning: you may need to install module-init-tools"; \
1149        echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1150        sleep 1; \
1151    fi
1152    @rm -rf $(MODLIB)/kernel
1153    @rm -f $(MODLIB)/source
1154    @mkdir -p $(MODLIB)/kernel
1155    @ln -s $(srctree) $(MODLIB)/source
1156    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1157        rm -f $(MODLIB)/build ; \
1158        ln -s $(objtree) $(MODLIB)/build ; \
1159    fi
1160    @cp -f $(objtree)/modules.order $(MODLIB)/
1161    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1162
1163# This depmod is only for convenience to give the initial
1164# boot a modules.dep even before / is mounted read-write. However the
1165# boot script depmod is the master version.
1166PHONY += _modinst_post
1167_modinst_post: _modinst_
1168    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1169    $(call cmd,depmod)
1170
1171else # CONFIG_MODULES
1172
1173# Modules not configured
1174# ---------------------------------------------------------------------------
1175
1176modules modules_install: FORCE
1177    @echo
1178    @echo "The present kernel configuration has modules disabled."
1179    @echo "Type 'make config' and enable loadable module support."
1180    @echo "Then build a kernel with module support enabled."
1181    @echo
1182    @exit 1
1183
1184endif # CONFIG_MODULES
1185
1186###
1187# Cleaning is done on three levels.
1188# make clean Delete most generated files
1189# Leave enough to build external modules
1190# make mrproper Delete the current configuration, and all generated files
1191# make distclean Remove editor backup files, patch leftover files and the like
1192
1193# Directories & files removed with 'make clean'
1194CLEAN_DIRS += $(MODVERDIR)
1195CLEAN_FILES += vmlinux System.map \
1196                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1197
1198# Directories & files removed with 'make mrproper'
1199MRPROPER_DIRS += include/config include2 usr/include include/generated
1200MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1201                  include/linux/autoconf.h include/linux/version.h \
1202                  include/linux/utsrelease.h \
1203                  include/linux/bounds.h include/asm*/asm-offsets.h \
1204          Module.symvers Module.markers tags TAGS cscope*
1205
1206# clean - Delete most, but leave enough to build external modules
1207#
1208clean: rm-dirs := $(CLEAN_DIRS)
1209clean: rm-files := $(CLEAN_FILES)
1210clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1211
1212PHONY += $(clean-dirs) clean archclean
1213$(clean-dirs):
1214    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1215
1216clean: archclean $(clean-dirs)
1217    $(call cmd,rmdirs)
1218    $(call cmd,rmfiles)
1219    @find . $(RCS_FIND_IGNORE) \
1220        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1221        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1222        -o -name '*.symtypes' -o -name 'modules.order' \
1223        -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1224        -o -name '*.gcno' \) -type f -print | xargs rm -f
1225
1226# mrproper - Delete all generated files, including .config
1227#
1228mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1229mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1230mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1231
1232PHONY += $(mrproper-dirs) mrproper archmrproper
1233$(mrproper-dirs):
1234    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1235
1236mrproper: clean archmrproper $(mrproper-dirs)
1237    $(call cmd,rmdirs)
1238    $(call cmd,rmfiles)
1239
1240# distclean
1241#
1242PHONY += distclean
1243
1244distclean: mrproper
1245    @find $(srctree) $(RCS_FIND_IGNORE) \
1246        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1247        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1248        -o -name '.*.rej' -o -size 0 \
1249        -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1250        -type f -print | xargs rm -f
1251
1252
1253# Packaging of the kernel to various formats
1254# ---------------------------------------------------------------------------
1255# rpm target kept for backward compatibility
1256package-dir := $(srctree)/scripts/package
1257
1258%pkg: include/config/kernel.release FORCE
1259    $(Q)$(MAKE) $(build)=$(package-dir) $@
1260rpm: include/config/kernel.release FORCE
1261    $(Q)$(MAKE) $(build)=$(package-dir) $@
1262
1263
1264# Brief documentation of the typical targets used
1265# ---------------------------------------------------------------------------
1266
1267boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1268boards := $(notdir $(boards))
1269board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1270board-dirs := $(sort $(notdir $(board-dirs:/=)))
1271
1272help:
1273    @echo 'Cleaning targets:'
1274    @echo ' clean - Remove most generated files but keep the config and'
1275    @echo ' enough build support to build external modules'
1276    @echo ' mrproper - Remove all generated files + config + various backup files'
1277    @echo ' distclean - mrproper + remove editor backup and patch files'
1278    @echo ''
1279    @echo 'Configuration targets:'
1280    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1281    @echo ''
1282    @echo 'Other generic targets:'
1283    @echo ' all - Build all targets marked with [*]'
1284    @echo '* vmlinux - Build the bare kernel'
1285    @echo '* modules - Build all modules'
1286    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1287    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1288    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1289    @echo ' dir/ - Build all files in dir and below'
1290    @echo ' dir/file.[ois] - Build specified target only'
1291    @echo ' dir/file.ko - Build module including final link'
1292    @echo ' modules_prepare - Set up for building external modules'
1293    @echo ' tags/TAGS - Generate tags file for editors'
1294    @echo ' cscope - Generate cscope index'
1295    @echo ' kernelrelease - Output the release version string'
1296    @echo ' kernelversion - Output the version stored in Makefile'
1297    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1298     echo ' (default: $(INSTALL_HDR_PATH))'; \
1299     echo ''
1300    @echo 'Static analysers'
1301    @echo ' checkstack - Generate a list of stack hogs'
1302    @echo ' namespacecheck - Name space analysis on compiled kernel'
1303    @echo ' versioncheck - Sanity check on version.h usage'
1304    @echo ' includecheck - Check for duplicate included header files'
1305    @echo ' export_report - List the usages of all exported symbols'
1306    @echo ' headers_check - Sanity check on exported headers'
1307    @echo ' headerdep - Detect inclusion cycles in headers'; \
1308     echo ''
1309    @echo 'Kernel packaging:'
1310    @$(MAKE) $(build)=$(package-dir) help
1311    @echo ''
1312    @echo 'Documentation targets:'
1313    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1314    @echo ''
1315    @echo 'Architecture specific targets ($(SRCARCH)):'
1316    @$(if $(archhelp),$(archhelp),\
1317        echo ' No architecture specific help defined for $(SRCARCH)')
1318    @echo ''
1319    @$(if $(boards), \
1320        $(foreach b, $(boards), \
1321        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1322        echo '')
1323    @$(if $(board-dirs), \
1324        $(foreach b, $(board-dirs), \
1325        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1326        printf " %-16s - Show all of the above\\n" help-boards; \
1327        echo '')
1328
1329    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1330    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1331    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1332    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1333    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1334    @echo ''
1335    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1336    @echo 'For further info see the ./README file'
1337
1338
1339help-board-dirs := $(addprefix help-,$(board-dirs))
1340
1341help-boards: $(help-board-dirs)
1342
1343boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1344
1345$(help-board-dirs): help-%:
1346    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1347    @$(if $(boards-per-dir), \
1348        $(foreach b, $(boards-per-dir), \
1349        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1350        echo '')
1351
1352
1353# Documentation targets
1354# ---------------------------------------------------------------------------
1355%docs: scripts_basic FORCE
1356    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1357
1358else # KBUILD_EXTMOD
1359
1360###
1361# External module support.
1362# When building external modules the kernel used as basis is considered
1363# read-only, and no consistency checks are made and the make
1364# system is not used on the basis kernel. If updates are required
1365# in the basis kernel ordinary make commands (without M=...) must
1366# be used.
1367#
1368# The following are the only valid targets when building external
1369# modules.
1370# make M=dir clean Delete all automatically generated files
1371# make M=dir modules Make all modules in specified dir
1372# make M=dir Same as 'make M=dir modules'
1373# make M=dir modules_install
1374# Install the modules built in the module directory
1375# Assumes install directory is already created
1376
1377# We are always building modules
1378KBUILD_MODULES := 1
1379PHONY += crmodverdir
1380crmodverdir:
1381    $(cmd_crmodverdir)
1382
1383PHONY += $(objtree)/Module.symvers
1384$(objtree)/Module.symvers:
1385    @test -e $(objtree)/Module.symvers || ( \
1386    echo; \
1387    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1388    echo " is missing; modules will have no dependencies and modversions."; \
1389    echo )
1390
1391module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1392PHONY += $(module-dirs) modules
1393$(module-dirs): crmodverdir $(objtree)/Module.symvers
1394    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1395
1396modules: $(module-dirs)
1397    @$(kecho) ' Building modules, stage 2.';
1398    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1399
1400PHONY += modules_install
1401modules_install: _emodinst_ _emodinst_post
1402
1403install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1404PHONY += _emodinst_
1405_emodinst_:
1406    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1407    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1408
1409PHONY += _emodinst_post
1410_emodinst_post: _emodinst_
1411    $(call cmd,depmod)
1412
1413clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1414
1415PHONY += $(clean-dirs) clean
1416$(clean-dirs):
1417    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1418
1419clean: rm-dirs := $(MODVERDIR)
1420clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1421                   $(KBUILD_EXTMOD)/Module.markers \
1422                   $(KBUILD_EXTMOD)/modules.order
1423clean: $(clean-dirs)
1424    $(call cmd,rmdirs)
1425    $(call cmd,rmfiles)
1426    @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1427        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1428        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1429        -o -name '*.gcno' \) -type f -print | xargs rm -f
1430
1431help:
1432    @echo ' Building external modules.'
1433    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1434    @echo ''
1435    @echo ' modules - default target, build the module(s)'
1436    @echo ' modules_install - install the module'
1437    @echo ' clean - remove generated files in module directory only'
1438    @echo ''
1439
1440# Dummies...
1441PHONY += prepare scripts
1442prepare: ;
1443scripts: ;
1444endif # KBUILD_EXTMOD
1445
1446# Generate tags for editors
1447# ---------------------------------------------------------------------------
1448quiet_cmd_tags = GEN $@
1449      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1450
1451tags TAGS cscope: FORCE
1452    $(call cmd,tags)
1453
1454# Scripts to check various things for consistency
1455# ---------------------------------------------------------------------------
1456
1457includecheck:
1458    find * $(RCS_FIND_IGNORE) \
1459        -name '*.[hcS]' -type f -print | sort \
1460        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1461
1462versioncheck:
1463    find * $(RCS_FIND_IGNORE) \
1464        -name '*.[hcS]' -type f -print | sort \
1465        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1466
1467namespacecheck:
1468    $(PERL) $(srctree)/scripts/namespace.pl
1469
1470export_report:
1471    $(PERL) $(srctree)/scripts/export_report.pl
1472
1473endif #ifeq ($(config-targets),1)
1474endif #ifeq ($(mixed-targets),1)
1475
1476PHONY += checkstack kernelrelease kernelversion
1477
1478# UML needs a little special treatment here. It wants to use the host
1479# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1480# else wants $(ARCH), including people doing cross-builds, which means
1481# that $(SUBARCH) doesn't work here.
1482ifeq ($(ARCH), um)
1483CHECKSTACK_ARCH := $(SUBARCH)
1484else
1485CHECKSTACK_ARCH := $(ARCH)
1486endif
1487checkstack:
1488    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1489    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1490
1491kernelrelease:
1492    $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1493    $(error kernelrelease not valid - run 'make prepare' to update it))
1494kernelversion:
1495    @echo $(KERNELVERSION)
1496
1497# Single targets
1498# ---------------------------------------------------------------------------
1499# Single targets are compatible with:
1500# - build with mixed source and output
1501# - build with separate output dir 'make O=...'
1502# - external modules
1503#
1504# target-dir => where to store outputfile
1505# build-dir => directory in kernel source tree to use
1506
1507ifeq ($(KBUILD_EXTMOD),)
1508        build-dir = $(patsubst %/,%,$(dir $@))
1509        target-dir = $(dir $@)
1510else
1511        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1512        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1513        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1514endif
1515
1516%.s: %.c prepare scripts FORCE
1517    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518%.i: %.c prepare scripts FORCE
1519    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520%.o: %.c prepare scripts FORCE
1521    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522%.lst: %.c prepare scripts FORCE
1523    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524%.s: %.S prepare scripts FORCE
1525    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526%.o: %.S prepare scripts FORCE
1527    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528%.symtypes: %.c prepare scripts FORCE
1529    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530
1531# Modules
1532/: prepare scripts FORCE
1533    $(cmd_crmodverdir)
1534    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1535    $(build)=$(build-dir)
1536%/: prepare scripts FORCE
1537    $(cmd_crmodverdir)
1538    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539    $(build)=$(build-dir)
1540%.ko: prepare scripts FORCE
1541    $(cmd_crmodverdir)
1542    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543    $(build)=$(build-dir) $(@:.ko=.o)
1544    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1545
1546# FIXME Should go into a make.lib or something
1547# ===========================================================================
1548
1549quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1550      cmd_rmdirs = rm -rf $(rm-dirs)
1551
1552quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1553      cmd_rmfiles = rm -f $(rm-files)
1554
1555# Run depmod only if we have System.map and depmod is executable
1556quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1557      cmd_depmod = \
1558    if [ -r System.map -a -x $(DEPMOD) ]; then \
1559        $(DEPMOD) -ae -F System.map \
1560        $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1561        $(KERNELRELEASE); \
1562    fi
1563
1564# Create temporary dir for module support files
1565# clean it up only when building all modules
1566cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1567                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1568
1569a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1570      $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1571      $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1572
1573quiet_cmd_as_o_S = AS $@
1574cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1575
1576# read all saved command lines
1577
1578targets := $(wildcard $(sort $(targets)))
1579cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1580
1581ifneq ($(cmd_files),)
1582  $(cmd_files): ; # Do not try to update included dependency files
1583  include $(cmd_files)
1584endif
1585
1586# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1587# Usage:
1588# $(Q)$(MAKE) $(clean)=dir
1589clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1590
1591endif # skip-makefile
1592
1593PHONY += FORCE
1594FORCE:
1595
1596# Declare the contents of the .PHONY variable as phony. We keep that
1597# information in a variable so we can use it in if_changed and friends.
1598.PHONY: $(PHONY)
1599

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