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Version:	[ 2.4.35 ] [ 2.6.16.53 ] [ 2.6.17 ] [ 2.6.18 ] [ 2.6.19 ] [ 2.6.20 ] [ 2.6.21 ] [ 2.6.22 ] [ 2.6.23 ] [ 2.6.24 ] [ 2.6.25 ]
001 VERSION = 2
002 PATCHLEVEL = 6
003 SUBLEVEL = 25
004 EXTRAVERSION =
005 NAME = Funky Weasel is Jiggy wit it
006 
007 # *DOCUMENTATION*
008 # To see a list of typical targets execute "make help"
009 # More info can be located in ./README
010 # Comments in this file are targeted only to the developer, do not
011 # expect to learn how to build the kernel reading this file.
012 
013 # Do not:
014 # o  use make's built-in rules and variables
015 #    (this increases performance and avoids hard-to-debug behaviour);
016 # o  print "Entering directory ...";
017 MAKEFLAGS += -rR --no-print-directory
018 
019 # We are using a recursive build, so we need to do a little thinking
020 # to get the ordering right.
021 #
022 # Most importantly: sub-Makefiles should only ever modify files in
023 # their own directory. If in some directory we have a dependency on
024 # a file in another dir (which doesn't happen often, but it's often
025 # unavoidable when linking the built-in.o targets which finally
026 # turn into vmlinux), we will call a sub make in that other dir, and
027 # after that we are sure that everything which is in that other dir
028 # is now up to date.
029 #
030 # The only cases where we need to modify files which have global
031 # effects are thus separated out and done before the recursive
032 # descending is started. They are now explicitly listed as the
033 # prepare rule.
034 
035 # To put more focus on warnings, be less verbose as default
036 # Use 'make V=1' to see the full commands
037 
038 ifdef V
039   ifeq ("$(origin V)", "command line")
040     KBUILD_VERBOSE = $(V)
041   endif
042 endif
043 ifndef KBUILD_VERBOSE
044   KBUILD_VERBOSE = 0
045 endif
046 
047 # Call a source code checker (by default, "sparse") as part of the
048 # C compilation.
049 #
050 # Use 'make C=1' to enable checking of only re-compiled files.
051 # Use 'make C=2' to enable checking of *all* source files, regardless
052 # of whether they are re-compiled or not.
053 #
054 # See the file "Documentation/sparse.txt" for more details, including
055 # where to get the "sparse" utility.
056 
057 ifdef C
058   ifeq ("$(origin C)", "command line")
059     KBUILD_CHECKSRC = $(C)
060   endif
061 endif
062 ifndef KBUILD_CHECKSRC
063   KBUILD_CHECKSRC = 0
064 endif
065 
066 # Use make M=dir to specify directory of external module to build
067 # Old syntax make ... SUBDIRS=$PWD is still supported
068 # Setting the environment variable KBUILD_EXTMOD take precedence
069 ifdef SUBDIRS
070   KBUILD_EXTMOD ?= $(SUBDIRS)
071 endif
072 ifdef M
073   ifeq ("$(origin M)", "command line")
074     KBUILD_EXTMOD := $(M)
075   endif
076 endif
077 
078 
079 # kbuild supports saving output files in a separate directory.
080 # To locate output files in a separate directory two syntaxes are supported.
081 # In both cases the working directory must be the root of the kernel src.
082 # 1) O=
083 # Use "make O=dir/to/store/output/files/"
084 #
085 # 2) Set KBUILD_OUTPUT
086 # Set the environment variable KBUILD_OUTPUT to point to the directory
087 # where the output files shall be placed.
088 # export KBUILD_OUTPUT=dir/to/store/output/files/
089 # make
090 #
091 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
092 # variable.
093 
094 
095 # KBUILD_SRC is set on invocation of make in OBJ directory
096 # KBUILD_SRC is not intended to be used by the regular user (for now)
097 ifeq ($(KBUILD_SRC),)
098 
099 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
101 ifdef O
102   ifeq ("$(origin O)", "command line")
103     KBUILD_OUTPUT := $(O)
104   endif
105 endif
106 
107 # That's our default target when none is given on the command line
108 PHONY := _all
109 _all:
110 
111 # Cancel implicit rules on top Makefile
112 $(CURDIR)/Makefile Makefile: ;
113 
114 ifneq ($(KBUILD_OUTPUT),)
115 # Invoke a second make in the output directory, passing relevant variables
116 # check that the output directory actually exists
117 saved-output := $(KBUILD_OUTPUT)
118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119 $(if $(KBUILD_OUTPUT),, \
120      $(error output directory "$(saved-output)" does not exist))
121 
122 PHONY += $(MAKECMDGOALS) sub-make
123 
124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
125         $(Q)@:
126 
127 sub-make: FORCE
128         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129         KBUILD_SRC=$(CURDIR) \
130         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131         $(filter-out _all sub-make,$(MAKECMDGOALS))
132 
133 # Leave processing to above invocation of make
134 skip-makefile := 1
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
137 
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile),)
140 
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
143 PHONY += all
144 ifeq ($(KBUILD_EXTMOD),)
145 _all: all
146 else
147 _all: modules
148 endif
149 
150 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
151 TOPDIR          := $(srctree)
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
153 objtree         := $(CURDIR)
154 src             := $(srctree)
155 obj             := $(objtree)
156 
157 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158 
159 export srctree objtree VPATH TOPDIR
160 
161 
162 # SUBARCH tells the usermode build what the underlying arch is.  That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below.  If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and 
166 # SUBARCH is subsequently ignored.
167 
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
170                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
171                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172                                   -e s/sh.*/sh/ )
173 
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
176 #
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
180 # make ARCH=ia64
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
183 
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192 export KBUILD_BUILDHOST := $(SUBARCH)
193 ARCH            ?= $(SUBARCH)
194 CROSS_COMPILE   ?=
195 
196 # Architecture as present in compile.h
197 UTS_MACHINE     := $(ARCH)
198 SRCARCH         := $(ARCH)
199 
200 # Additional ARCH settings for x86
201 ifeq ($(ARCH),i386)
202         SRCARCH := x86
203 endif
204 ifeq ($(ARCH),x86_64)
205         SRCARCH := x86
206 endif
207 
208 KCONFIG_CONFIG  ?= .config
209 
210 # SHELL used by kbuild
211 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
212           else if [ -x /bin/bash ]; then echo /bin/bash; \
213           else echo sh; fi ; fi)
214 
215 HOSTCC       = gcc
216 HOSTCXX      = g++
217 HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
218 HOSTCXXFLAGS = -O2
219 
220 # Decide whether to build built-in, modular, or both.
221 # Normally, just do built-in.
222 
223 KBUILD_MODULES :=
224 KBUILD_BUILTIN := 1
225 
226 #       If we have only "make modules", don't compile built-in objects.
227 #       When we're building modules with modversions, we need to consider
228 #       the built-in objects during the descend as well, in order to
229 #       make sure the checksums are up to date before we record them.
230 
231 ifeq ($(MAKECMDGOALS),modules)
232   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
233 endif
234 
235 #       If we have "make <whatever> modules", compile modules
236 #       in addition to whatever we do anyway.
237 #       Just "make" or "make all" shall build modules as well
238 
239 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
240   KBUILD_MODULES := 1
241 endif
242 
243 ifeq ($(MAKECMDGOALS),)
244   KBUILD_MODULES := 1
245 endif
246 
247 export KBUILD_MODULES KBUILD_BUILTIN
248 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
249 
250 # Beautify output
251 # ---------------------------------------------------------------------------
252 #
253 # Normally, we echo the whole command before executing it. By making
254 # that echo $($(quiet)$(cmd)), we now have the possibility to set
255 # $(quiet) to choose other forms of output instead, e.g.
256 #
257 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
258 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
259 #
260 # If $(quiet) is empty, the whole command will be printed.
261 # If it is set to "quiet_", only the short version will be printed. 
262 # If it is set to "silent_", nothing will be printed at all, since
263 # the variable $(silent_cmd_cc_o_c) doesn't exist.
264 #
265 # A simple variant is to prefix commands with $(Q) - that's useful
266 # for commands that shall be hidden in non-verbose mode.
267 #
268 #       $(Q)ln $@ :<
269 #
270 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
271 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
272 
273 ifeq ($(KBUILD_VERBOSE),1)
274   quiet =
275   Q =
276 else
277   quiet=quiet_
278   Q = @
279 endif
280 
281 # If the user is running make -s (silent mode), suppress echoing of
282 # commands
283 
284 ifneq ($(findstring s,$(MAKEFLAGS)),)
285   quiet=silent_
286 endif
287 
288 export quiet Q KBUILD_VERBOSE
289 
290 
291 # Look for make include files relative to root of kernel src
292 MAKEFLAGS += --include-dir=$(srctree)
293 
294 # We need some generic definitions (do not try to remake the file).
295 $(srctree)/scripts/Kbuild.include: ;
296 include $(srctree)/scripts/Kbuild.include
297 
298 # Make variables (CC, etc...)
299 
300 AS              = $(CROSS_COMPILE)as
301 LD              = $(CROSS_COMPILE)ld
302 CC              = $(CROSS_COMPILE)gcc
303 CPP             = $(CC) -E
304 AR              = $(CROSS_COMPILE)ar
305 NM              = $(CROSS_COMPILE)nm
306 STRIP           = $(CROSS_COMPILE)strip
307 OBJCOPY         = $(CROSS_COMPILE)objcopy
308 OBJDUMP         = $(CROSS_COMPILE)objdump
309 AWK             = awk
310 GENKSYMS        = scripts/genksyms/genksyms
311 DEPMOD          = /sbin/depmod
312 KALLSYMS        = scripts/kallsyms
313 PERL            = perl
314 CHECK           = sparse
315 
316 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
317 MODFLAGS        = -DMODULE
318 CFLAGS_MODULE   = $(MODFLAGS)
319 AFLAGS_MODULE   = $(MODFLAGS)
320 LDFLAGS_MODULE  =
321 CFLAGS_KERNEL   =
322 AFLAGS_KERNEL   =
323 
324 
325 # Use LINUXINCLUDE when you must reference the include/ directory.
326 # Needed to be compatible with the O= option
327 LINUXINCLUDE    := -Iinclude \
328                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
329                    -include include/linux/autoconf.h
330 
331 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
332 
333 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
334                    -fno-strict-aliasing -fno-common \
335                    -Werror-implicit-function-declaration
336 KBUILD_AFLAGS   := -D__ASSEMBLY__
337 
338 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
339 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
340 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
341 
342 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
344 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
345 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
346 
347 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
348 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
349 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
350 
351 # When compiling out-of-tree modules, put MODVERDIR in the module
352 # tree rather than in the kernel tree. The kernel tree might
353 # even be read-only.
354 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
355 
356 # Files to ignore in find ... statements
357 
358 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
359 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
360 
361 # ===========================================================================
362 # Rules shared between *config targets and build targets
363 
364 # Basic helpers built in scripts/
365 PHONY += scripts_basic
366 scripts_basic:
367         $(Q)$(MAKE) $(build)=scripts/basic
368 
369 # To avoid any implicit rule to kick in, define an empty command.
370 scripts/basic/%: scripts_basic ;
371 
372 PHONY += outputmakefile
373 # outputmakefile generates a Makefile in the output directory, if using a
374 # separate output directory. This allows convenient use of make in the
375 # output directory.
376 outputmakefile:
377 ifneq ($(KBUILD_SRC),)
378         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
379             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
380 endif
381 
382 # To make sure we do not include .config for any of the *config targets
383 # catch them early, and hand them over to scripts/kconfig/Makefile
384 # It is allowed to specify more targets when calling make, including
385 # mixing *config targets and build targets.
386 # For example 'make oldconfig all'.
387 # Detect when mixed targets is specified, and make a second invocation
388 # of make so .config is not included in this case either (for *config).
389 
390 no-dot-config-targets := clean mrproper distclean \
391                          cscope TAGS tags help %docs check% \
392                          include/linux/version.h headers_% \
393                          kernelrelease kernelversion
394 
395 config-targets := 0
396 mixed-targets  := 0
397 dot-config     := 1
398 
399 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
400         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
401                 dot-config := 0
402         endif
403 endif
404 
405 ifeq ($(KBUILD_EXTMOD),)
406         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
407                 config-targets := 1
408                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
409                         mixed-targets := 1
410                 endif
411         endif
412 endif
413 
414 ifeq ($(mixed-targets),1)
415 # ===========================================================================
416 # We're called with mixed targets (*config and build targets).
417 # Handle them one by one.
418 
419 %:: FORCE
420         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
421 
422 else
423 ifeq ($(config-targets),1)
424 # ===========================================================================
425 # *config targets only - make sure prerequisites are updated, and descend
426 # in scripts/kconfig to make the *config target
427 
428 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
429 # KBUILD_DEFCONFIG may point out an alternative default configuration
430 # used for 'make defconfig'
431 include $(srctree)/arch/$(SRCARCH)/Makefile
432 export KBUILD_DEFCONFIG
433 
434 config %config: scripts_basic outputmakefile FORCE
435         $(Q)mkdir -p include/linux include/config
436         $(Q)$(MAKE) $(build)=scripts/kconfig $@
437 
438 else
439 # ===========================================================================
440 # Build targets only - this includes vmlinux, arch specific targets, clean
441 # targets and others. In general all targets except *config targets.
442 
443 ifeq ($(KBUILD_EXTMOD),)
444 # Additional helpers built in scripts/
445 # Carefully list dependencies so we do not try to build scripts twice
446 # in parallel
447 PHONY += scripts
448 scripts: scripts_basic include/config/auto.conf
449         $(Q)$(MAKE) $(build)=$(@)
450 
451 # Objects we will link into vmlinux / subdirs we need to visit
452 init-y          := init/
453 drivers-y       := drivers/ sound/
454 net-y           := net/
455 libs-y          := lib/
456 core-y          := usr/
457 endif # KBUILD_EXTMOD
458 
459 ifeq ($(dot-config),1)
460 # Read in config
461 -include include/config/auto.conf
462 
463 ifeq ($(KBUILD_EXTMOD),)
464 # Read in dependencies to all Kconfig* files, make sure to run
465 # oldconfig if changes are detected.
466 -include include/config/auto.conf.cmd
467 
468 # To avoid any implicit rule to kick in, define an empty command
469 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
470 
471 # If .config is newer than include/config/auto.conf, someone tinkered
472 # with it and forgot to run make oldconfig.
473 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
474 # we execute the config step to be sure to catch updated Kconfig files
475 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
476         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
477 else
478 # external modules needs include/linux/autoconf.h and include/config/auto.conf
479 # but do not care if they are up-to-date. Use auto.conf to trigger the test
480 PHONY += include/config/auto.conf
481 
482 include/config/auto.conf:
483         $(Q)test -e include/linux/autoconf.h -a -e $@ || (              \
484         echo;                                                           \
485         echo "  ERROR: Kernel configuration is invalid.";               \
486         echo "         include/linux/autoconf.h or $@ are missing.";    \
487         echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
488         echo;                                                           \
489         /bin/false)
490 
491 endif # KBUILD_EXTMOD
492 
493 else
494 # Dummy target needed, because used as prerequisite
495 include/config/auto.conf: ;
496 endif # $(dot-config)
497 
498 # The all: target is the default when no target is given on the
499 # command line.
500 # This allow a user to issue only 'make' to build a kernel including modules
501 # Defaults vmlinux but it is usually overridden in the arch makefile
502 all: vmlinux
503 
504 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
505 KBUILD_CFLAGS   += -Os
506 else
507 KBUILD_CFLAGS   += -O2
508 endif
509 
510 # Force gcc to behave correct even for buggy distributions
511 # Arch Makefiles may override this setting
512 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
513 
514 include $(srctree)/arch/$(SRCARCH)/Makefile
515 
516 ifdef CONFIG_FRAME_POINTER
517 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
518 else
519 KBUILD_CFLAGS   += -fomit-frame-pointer
520 endif
521 
522 ifdef CONFIG_DEBUG_INFO
523 KBUILD_CFLAGS   += -g
524 KBUILD_AFLAGS   += -gdwarf-2
525 endif
526 
527 # We trigger additional mismatches with less inlining
528 ifdef CONFIG_DEBUG_SECTION_MISMATCH
529 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
530 endif
531 
532 # arch Makefile may override CC so keep this after arch Makefile is included
533 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
534 CHECKFLAGS     += $(NOSTDINC_FLAGS)
535 
536 # warn about C99 declaration after statement
537 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
538 
539 # disable pointer signed / unsigned warnings in gcc 4.0
540 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
541 
542 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
543 # But warn user when we do so
544 warn-assign = \
545 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
546 
547 ifneq ($(KCPPFLAGS),)
548         $(call warn-assign,CPPFLAGS)
549         KBUILD_CPPFLAGS += $(KCPPFLAGS)
550 endif
551 ifneq ($(KAFLAGS),)
552         $(call warn-assign,AFLAGS)
553         KBUILD_AFLAGS += $(KAFLAGS)
554 endif
555 ifneq ($(KCFLAGS),)
556         $(call warn-assign,CFLAGS)
557         KBUILD_CFLAGS += $(KCFLAGS)
558 endif
559 
560 # Use --build-id when available.
561 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
562                               $(call ld-option, -Wl$(comma)--build-id,))
563 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
564 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
565 
566 # Default kernel image to build when no specific target is given.
567 # KBUILD_IMAGE may be overruled on the command line or
568 # set in the environment
569 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
570 # this default value
571 export KBUILD_IMAGE ?= vmlinux
572 
573 #
574 # INSTALL_PATH specifies where to place the updated kernel and system map
575 # images. Default is /boot, but you can set it to other values
576 export  INSTALL_PATH ?= /boot
577 
578 #
579 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
580 # relocations required by build roots.  This is not defined in the
581 # makefile but the argument can be passed to make if needed.
582 #
583 
584 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
585 export MODLIB
586 
587 #
588 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
589 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
590 #  the default option --strip-debug will be used.  Otherwise,
591 #  INSTALL_MOD_STRIP will used as the options to the strip command.
592 
593 ifdef INSTALL_MOD_STRIP
594 ifeq ($(INSTALL_MOD_STRIP),1)
595 mod_strip_cmd = $(STRIP) --strip-debug
596 else
597 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
598 endif # INSTALL_MOD_STRIP=1
599 else
600 mod_strip_cmd = true
601 endif # INSTALL_MOD_STRIP
602 export mod_strip_cmd
603 
604 
605 ifeq ($(KBUILD_EXTMOD),)
606 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
607 
608 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
609                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
610                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
611 
612 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
613                      $(init-n) $(init-) \
614                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
615                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
616 
617 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
618 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
619 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
620 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
621 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
622 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
623 libs-y          := $(libs-y1) $(libs-y2)
624 
625 # Build vmlinux
626 # ---------------------------------------------------------------------------
627 # vmlinux is built from the objects selected by $(vmlinux-init) and
628 # $(vmlinux-main). Most are built-in.o files from top-level directories
629 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
630 # Ordering when linking is important, and $(vmlinux-init) must be first.
631 #
632 # vmlinux
633 #   ^
634 #   |
635 #   +-< $(vmlinux-init)
636 #   |   +--< init/version.o + more
637 #   |
638 #   +--< $(vmlinux-main)
639 #   |    +--< driver/built-in.o mm/built-in.o + more
640 #   |
641 #   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
642 #
643 # vmlinux version (uname -v) cannot be updated during normal
644 # descending-into-subdirs phase since we do not yet know if we need to
645 # update vmlinux.
646 # Therefore this step is delayed until just before final link of vmlinux -
647 # except in the kallsyms case where it is done just before adding the
648 # symbols to the kernel.
649 #
650 # System.map is generated to document addresses of all kernel symbols
651 
652 vmlinux-init := $(head-y) $(init-y)
653 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
654 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
655 vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
656 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
657 
658 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
659 # May be overridden by arch/$(ARCH)/Makefile
660 quiet_cmd_vmlinux__ ?= LD      $@
661       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
662       -T $(vmlinux-lds) $(vmlinux-init)                          \
663       --start-group $(vmlinux-main) --end-group                  \
664       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
665 
666 # Generate new vmlinux version
667 quiet_cmd_vmlinux_version = GEN     .version
668       cmd_vmlinux_version = set -e;                     \
669         if [ ! -r .version ]; then                      \
670           rm -f .version;                               \
671           echo 1 >.version;                             \
672         else                                            \
673           mv .version .old_version;                     \
674           expr 0$$(cat .old_version) + 1 >.version;     \
675         fi;                                             \
676         $(MAKE) $(build)=init
677 
678 # Generate System.map
679 quiet_cmd_sysmap = SYSMAP
680       cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
681 
682 # Link of vmlinux
683 # If CONFIG_KALLSYMS is set .version is already updated
684 # Generate System.map and verify that the content is consistent
685 # Use + in front of the vmlinux_version rule to silent warning with make -j2
686 # First command is ':' to allow us to use + in front of the rule
687 define rule_vmlinux__
688         :
689         $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
690 
691         $(call cmd,vmlinux__)
692         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
693 
694         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
695           echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
696         $(cmd_sysmap) $@ System.map;                                         \
697         if [ $$? -ne 0 ]; then                                               \
698                 rm -f $@;                                                    \
699                 /bin/false;                                                  \
700         fi;
701         $(verify_kallsyms)
702 endef
703 
704 
705 ifdef CONFIG_KALLSYMS
706 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
707 # It's a three stage process:
708 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
709 #   empty
710 #   Running kallsyms on that gives us .tmp_kallsyms1.o with
711 #   the right size - vmlinux version (uname -v) is updated during this step
712 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
713 #   but due to the added section, some addresses have shifted.
714 #   From here, we generate a correct .tmp_kallsyms2.o
715 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
716 # o Verify that the System.map from vmlinux matches the map from
717 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
718 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
719 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
720 #   temporary bypass to allow the kernel to be built while the
721 #   maintainers work out what went wrong with kallsyms.
722 
723 ifdef CONFIG_KALLSYMS_EXTRA_PASS
724 last_kallsyms := 3
725 else
726 last_kallsyms := 2
727 endif
728 
729 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
730 
731 define verify_kallsyms
732         $(Q)$(if $($(quiet)cmd_sysmap),                                      \
733           echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
734           $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
735         $(Q)cmp -s System.map .tmp_System.map ||                             \
736                 (echo Inconsistent kallsyms data;                            \
737                  echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
738                  rm .tmp_kallsyms* ; /bin/false )
739 endef
740 
741 # Update vmlinux version before link
742 # Use + in front of this rule to silent warning about make -j1
743 # First command is ':' to allow us to use + in front of this rule
744 cmd_ksym_ld = $(cmd_vmlinux__)
745 define rule_ksym_ld
746         : 
747         +$(call cmd,vmlinux_version)
748         $(call cmd,vmlinux__)
749         $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
750 endef
751 
752 # Generate .S file with all kernel symbols
753 quiet_cmd_kallsyms = KSYM    $@
754       cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
755                      $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
756 
757 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
758         $(call if_changed_dep,as_o_S)
759 
760 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
761         $(call cmd,kallsyms)
762 
763 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
764 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
765         $(call if_changed_rule,ksym_ld)
766 
767 .tmp_vmlinux2: $(vmlinux-