Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/Makefile

  1 VERSION = 4
  2 PATCHLEVEL = 8
  3 SUBLEVEL = 0
  4 EXTRAVERSION =
  5 NAME = Psychotic Stoned Sheep
  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 # o Do not use make's built-in rules and variables
 14 #   (this increases performance and avoids hard-to-debug behaviour);
 15 # o Look for make include files relative to root of kernel src
 16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
 17 
 18 # Avoid funny character set dependencies
 19 unexport LC_ALL
 20 LC_COLLATE=C
 21 LC_NUMERIC=C
 22 export LC_COLLATE LC_NUMERIC
 23 
 24 # Avoid interference with shell env settings
 25 unexport GREP_OPTIONS
 26 
 27 # We are using a recursive build, so we need to do a little thinking
 28 # to get the ordering right.
 29 #
 30 # Most importantly: sub-Makefiles should only ever modify files in
 31 # their own directory. If in some directory we have a dependency on
 32 # a file in another dir (which doesn't happen often, but it's often
 33 # unavoidable when linking the built-in.o targets which finally
 34 # turn into vmlinux), we will call a sub make in that other dir, and
 35 # after that we are sure that everything which is in that other dir
 36 # is now up to date.
 37 #
 38 # The only cases where we need to modify files which have global
 39 # effects are thus separated out and done before the recursive
 40 # descending is started. They are now explicitly listed as the
 41 # prepare rule.
 42 
 43 # Beautify output
 44 # ---------------------------------------------------------------------------
 45 #
 46 # Normally, we echo the whole command before executing it. By making
 47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 48 # $(quiet) to choose other forms of output instead, e.g.
 49 #
 50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 52 #
 53 # If $(quiet) is empty, the whole command will be printed.
 54 # If it is set to "quiet_", only the short version will be printed.
 55 # If it is set to "silent_", nothing will be printed at all, since
 56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 57 #
 58 # A simple variant is to prefix commands with $(Q) - that's useful
 59 # for commands that shall be hidden in non-verbose mode.
 60 #
 61 #       $(Q)ln $@ :<
 62 #
 63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 65 #
 66 # To put more focus on warnings, be less verbose as default
 67 # Use 'make V=1' to see the full commands
 68 
 69 ifeq ("$(origin V)", "command line")
 70   KBUILD_VERBOSE = $(V)
 71 endif
 72 ifndef KBUILD_VERBOSE
 73   KBUILD_VERBOSE = 0
 74 endif
 75 
 76 ifeq ($(KBUILD_VERBOSE),1)
 77   quiet =
 78   Q =
 79 else
 80   quiet=quiet_
 81   Q = @
 82 endif
 83 
 84 # If the user is running make -s (silent mode), suppress echoing of
 85 # commands
 86 
 87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 89   quiet=silent_
 90 endif
 91 else                                    # make-3.8x
 92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 93   quiet=silent_
 94 endif
 95 endif
 96 
 97 export quiet Q KBUILD_VERBOSE
 98 
 99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
102 # 1) O=
103 # Use "make O=dir/to/store/output/files/"
104 #
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
109 # make
110 #
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
112 # variable.
113 
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC),)
117 
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121   KBUILD_OUTPUT := $(O)
122 endif
123 
124 # That's our default target when none is given on the command line
125 PHONY := _all
126 _all:
127 
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
130 
131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132   $(error main directory cannot contain spaces nor colons)
133 endif
134 
135 ifneq ($(KBUILD_OUTPUT),)
136 # Invoke a second make in the output directory, passing relevant variables
137 # check that the output directory actually exists
138 saved-output := $(KBUILD_OUTPUT)
139 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
140                                                                 && /bin/pwd)
141 $(if $(KBUILD_OUTPUT),, \
142      $(error failed to create output directory "$(saved-output)"))
143 
144 PHONY += $(MAKECMDGOALS) sub-make
145 
146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
147         @:
148 
149 sub-make:
150         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
151         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
152 
153 # Leave processing to above invocation of make
154 skip-makefile := 1
155 endif # ifneq ($(KBUILD_OUTPUT),)
156 endif # ifeq ($(KBUILD_SRC),)
157 
158 # We process the rest of the Makefile if this is the final invocation of make
159 ifeq ($(skip-makefile),)
160 
161 # Do not print "Entering directory ...",
162 # but we want to display it when entering to the output directory
163 # so that IDEs/editors are able to understand relative filenames.
164 MAKEFLAGS += --no-print-directory
165 
166 # Call a source code checker (by default, "sparse") as part of the
167 # C compilation.
168 #
169 # Use 'make C=1' to enable checking of only re-compiled files.
170 # Use 'make C=2' to enable checking of *all* source files, regardless
171 # of whether they are re-compiled or not.
172 #
173 # See the file "Documentation/sparse.txt" for more details, including
174 # where to get the "sparse" utility.
175 
176 ifeq ("$(origin C)", "command line")
177   KBUILD_CHECKSRC = $(C)
178 endif
179 ifndef KBUILD_CHECKSRC
180   KBUILD_CHECKSRC = 0
181 endif
182 
183 # Use make M=dir to specify directory of external module to build
184 # Old syntax make ... SUBDIRS=$PWD is still supported
185 # Setting the environment variable KBUILD_EXTMOD take precedence
186 ifdef SUBDIRS
187   KBUILD_EXTMOD ?= $(SUBDIRS)
188 endif
189 
190 ifeq ("$(origin M)", "command line")
191   KBUILD_EXTMOD := $(M)
192 endif
193 
194 # If building an external module we do not care about the all: rule
195 # but instead _all depend on modules
196 PHONY += all
197 ifeq ($(KBUILD_EXTMOD),)
198 _all: all
199 else
200 _all: modules
201 endif
202 
203 ifeq ($(KBUILD_SRC),)
204         # building in the source tree
205         srctree := .
206 else
207         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208                 # building in a subdirectory of the source tree
209                 srctree := ..
210         else
211                 srctree := $(KBUILD_SRC)
212         endif
213 endif
214 objtree         := .
215 src             := $(srctree)
216 obj             := $(objtree)
217 
218 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
219 
220 export srctree objtree VPATH
221 
222 # SUBARCH tells the usermode build what the underlying arch is.  That is set
223 # first, and if a usermode build is happening, the "ARCH=um" on the command
224 # line overrides the setting of ARCH below.  If a native build is happening,
225 # then ARCH is assigned, getting whatever value it gets normally, and
226 # SUBARCH is subsequently ignored.
227 
228 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
229                                   -e s/sun4u/sparc64/ \
230                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
231                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
232                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
233                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
234 
235 # Cross compiling and selecting different set of gcc/bin-utils
236 # ---------------------------------------------------------------------------
237 #
238 # When performing cross compilation for other architectures ARCH shall be set
239 # to the target architecture. (See arch/* for the possibilities).
240 # ARCH can be set during invocation of make:
241 # make ARCH=ia64
242 # Another way is to have ARCH set in the environment.
243 # The default ARCH is the host where make is executed.
244 
245 # CROSS_COMPILE specify the prefix used for all executables used
246 # during compilation. Only gcc and related bin-utils executables
247 # are prefixed with $(CROSS_COMPILE).
248 # CROSS_COMPILE can be set on the command line
249 # make CROSS_COMPILE=ia64-linux-
250 # Alternatively CROSS_COMPILE can be set in the environment.
251 # A third alternative is to store a setting in .config so that plain
252 # "make" in the configured kernel build directory always uses that.
253 # Default value for CROSS_COMPILE is not to prefix executables
254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
255 ARCH            ?= $(SUBARCH)
256 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
257 
258 # Architecture as present in compile.h
259 UTS_MACHINE     := $(ARCH)
260 SRCARCH         := $(ARCH)
261 
262 # Additional ARCH settings for x86
263 ifeq ($(ARCH),i386)
264         SRCARCH := x86
265 endif
266 ifeq ($(ARCH),x86_64)
267         SRCARCH := x86
268 endif
269 
270 # Additional ARCH settings for sparc
271 ifeq ($(ARCH),sparc32)
272        SRCARCH := sparc
273 endif
274 ifeq ($(ARCH),sparc64)
275        SRCARCH := sparc
276 endif
277 
278 # Additional ARCH settings for sh
279 ifeq ($(ARCH),sh64)
280        SRCARCH := sh
281 endif
282 
283 # Additional ARCH settings for tile
284 ifeq ($(ARCH),tilepro)
285        SRCARCH := tile
286 endif
287 ifeq ($(ARCH),tilegx)
288        SRCARCH := tile
289 endif
290 
291 # Where to locate arch specific headers
292 hdr-arch  := $(SRCARCH)
293 
294 KCONFIG_CONFIG  ?= .config
295 export KCONFIG_CONFIG
296 
297 # SHELL used by kbuild
298 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
299           else if [ -x /bin/bash ]; then echo /bin/bash; \
300           else echo sh; fi ; fi)
301 
302 HOSTCC       = gcc
303 HOSTCXX      = g++
304 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
305 HOSTCXXFLAGS = -O2
306 
307 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
308 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
309                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
310 endif
311 
312 # Decide whether to build built-in, modular, or both.
313 # Normally, just do built-in.
314 
315 KBUILD_MODULES :=
316 KBUILD_BUILTIN := 1
317 
318 # If we have only "make modules", don't compile built-in objects.
319 # When we're building modules with modversions, we need to consider
320 # the built-in objects during the descend as well, in order to
321 # make sure the checksums are up to date before we record them.
322 
323 ifeq ($(MAKECMDGOALS),modules)
324   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
325 endif
326 
327 # If we have "make <whatever> modules", compile modules
328 # in addition to whatever we do anyway.
329 # Just "make" or "make all" shall build modules as well
330 
331 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
332   KBUILD_MODULES := 1
333 endif
334 
335 ifeq ($(MAKECMDGOALS),)
336   KBUILD_MODULES := 1
337 endif
338 
339 export KBUILD_MODULES KBUILD_BUILTIN
340 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
341 
342 # We need some generic definitions (do not try to remake the file).
343 scripts/Kbuild.include: ;
344 include scripts/Kbuild.include
345 
346 # Make variables (CC, etc...)
347 AS              = $(CROSS_COMPILE)as
348 LD              = $(CROSS_COMPILE)ld
349 CC              = $(CROSS_COMPILE)gcc
350 CPP             = $(CC) -E
351 AR              = $(CROSS_COMPILE)ar
352 NM              = $(CROSS_COMPILE)nm
353 STRIP           = $(CROSS_COMPILE)strip
354 OBJCOPY         = $(CROSS_COMPILE)objcopy
355 OBJDUMP         = $(CROSS_COMPILE)objdump
356 AWK             = awk
357 GENKSYMS        = scripts/genksyms/genksyms
358 INSTALLKERNEL  := installkernel
359 DEPMOD          = /sbin/depmod
360 PERL            = perl
361 PYTHON          = python
362 CHECK           = sparse
363 
364 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
365                   -Wbitwise -Wno-return-void $(CF)
366 NOSTDINC_FLAGS  =
367 CFLAGS_MODULE   =
368 AFLAGS_MODULE   =
369 LDFLAGS_MODULE  =
370 CFLAGS_KERNEL   =
371 AFLAGS_KERNEL   =
372 LDFLAGS_vmlinux =
373 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
374 CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
375 
376 
377 # Use USERINCLUDE when you must reference the UAPI directories only.
378 USERINCLUDE    := \
379                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
380                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
381                 -I$(srctree)/include/uapi \
382                 -I$(objtree)/include/generated/uapi \
383                 -include $(srctree)/include/linux/kconfig.h
384 
385 # Use LINUXINCLUDE when you must reference the include/ directory.
386 # Needed to be compatible with the O= option
387 LINUXINCLUDE    := \
388                 -I$(srctree)/arch/$(hdr-arch)/include \
389                 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
390                 -I$(objtree)/arch/$(hdr-arch)/include/generated \
391                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
392                 -I$(objtree)/include
393 
394 LINUXINCLUDE    += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
395 
396 KBUILD_CPPFLAGS := -D__KERNEL__
397 
398 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
399                    -fno-strict-aliasing -fno-common \
400                    -Werror-implicit-function-declaration \
401                    -Wno-format-security \
402                    -std=gnu89
403 
404 KBUILD_AFLAGS_KERNEL :=
405 KBUILD_CFLAGS_KERNEL :=
406 KBUILD_AFLAGS   := -D__ASSEMBLY__
407 KBUILD_AFLAGS_MODULE  := -DMODULE
408 KBUILD_CFLAGS_MODULE  := -DMODULE
409 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
410 
411 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
412 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
413 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
414 
415 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
416 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
417 export CPP AR NM STRIP OBJCOPY OBJDUMP
418 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
419 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
420 
421 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
422 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
423 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
424 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
425 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
426 export KBUILD_ARFLAGS
427 
428 # When compiling out-of-tree modules, put MODVERDIR in the module
429 # tree rather than in the kernel tree. The kernel tree might
430 # even be read-only.
431 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
432 
433 # Files to ignore in find ... statements
434 
435 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
436                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
437                           -prune -o
438 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
439                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
440 
441 # ===========================================================================
442 # Rules shared between *config targets and build targets
443 
444 # Basic helpers built in scripts/
445 PHONY += scripts_basic
446 scripts_basic:
447         $(Q)$(MAKE) $(build)=scripts/basic
448         $(Q)rm -f .tmp_quiet_recordmcount
449 
450 # To avoid any implicit rule to kick in, define an empty command.
451 scripts/basic/%: scripts_basic ;
452 
453 PHONY += outputmakefile
454 # outputmakefile generates a Makefile in the output directory, if using a
455 # separate output directory. This allows convenient use of make in the
456 # output directory.
457 outputmakefile:
458 ifneq ($(KBUILD_SRC),)
459         $(Q)ln -fsn $(srctree) source
460         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
461             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
462 endif
463 
464 # Support for using generic headers in asm-generic
465 PHONY += asm-generic
466 asm-generic:
467         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
468                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
469         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
471 
472 # To make sure we do not include .config for any of the *config targets
473 # catch them early, and hand them over to scripts/kconfig/Makefile
474 # It is allowed to specify more targets when calling make, including
475 # mixing *config targets and build targets.
476 # For example 'make oldconfig all'.
477 # Detect when mixed targets is specified, and make a second invocation
478 # of make so .config is not included in this case either (for *config).
479 
480 version_h := include/generated/uapi/linux/version.h
481 old_version_h := include/linux/version.h
482 
483 no-dot-config-targets := clean mrproper distclean \
484                          cscope gtags TAGS tags help% %docs check% coccicheck \
485                          $(version_h) headers_% archheaders archscripts \
486                          kernelversion %src-pkg
487 
488 config-targets := 0
489 mixed-targets  := 0
490 dot-config     := 1
491 
492 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
493         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
494                 dot-config := 0
495         endif
496 endif
497 
498 ifeq ($(KBUILD_EXTMOD),)
499         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
500                 config-targets := 1
501                 ifneq ($(words $(MAKECMDGOALS)),1)
502                         mixed-targets := 1
503                 endif
504         endif
505 endif
506 # install and module_install need also be processed one by one
507 ifneq ($(filter install,$(MAKECMDGOALS)),)
508         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
509                 mixed-targets := 1
510         endif
511 endif
512 
513 ifeq ($(mixed-targets),1)
514 # ===========================================================================
515 # We're called with mixed targets (*config and build targets).
516 # Handle them one by one.
517 
518 PHONY += $(MAKECMDGOALS) __build_one_by_one
519 
520 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
521         @:
522 
523 __build_one_by_one:
524         $(Q)set -e; \
525         for i in $(MAKECMDGOALS); do \
526                 $(MAKE) -f $(srctree)/Makefile $$i; \
527         done
528 
529 else
530 ifeq ($(config-targets),1)
531 # ===========================================================================
532 # *config targets only - make sure prerequisites are updated, and descend
533 # in scripts/kconfig to make the *config target
534 
535 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
536 # KBUILD_DEFCONFIG may point out an alternative default configuration
537 # used for 'make defconfig'
538 include arch/$(SRCARCH)/Makefile
539 export KBUILD_DEFCONFIG KBUILD_KCONFIG
540 
541 config: scripts_basic outputmakefile FORCE
542         $(Q)$(MAKE) $(build)=scripts/kconfig $@
543 
544 %config: scripts_basic outputmakefile FORCE
545         $(Q)$(MAKE) $(build)=scripts/kconfig $@
546 
547 else
548 # ===========================================================================
549 # Build targets only - this includes vmlinux, arch specific targets, clean
550 # targets and others. In general all targets except *config targets.
551 
552 ifeq ($(KBUILD_EXTMOD),)
553 # Additional helpers built in scripts/
554 # Carefully list dependencies so we do not try to build scripts twice
555 # in parallel
556 PHONY += scripts
557 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
558          asm-generic gcc-plugins
559         $(Q)$(MAKE) $(build)=$(@)
560 
561 # Objects we will link into vmlinux / subdirs we need to visit
562 init-y          := init/
563 drivers-y       := drivers/ sound/ firmware/
564 net-y           := net/
565 libs-y          := lib/
566 core-y          := usr/
567 virt-y          := virt/
568 endif # KBUILD_EXTMOD
569 
570 ifeq ($(dot-config),1)
571 # Read in config
572 -include include/config/auto.conf
573 
574 ifeq ($(KBUILD_EXTMOD),)
575 # Read in dependencies to all Kconfig* files, make sure to run
576 # oldconfig if changes are detected.
577 -include include/config/auto.conf.cmd
578 
579 # To avoid any implicit rule to kick in, define an empty command
580 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
581 
582 # If .config is newer than include/config/auto.conf, someone tinkered
583 # with it and forgot to run make oldconfig.
584 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
585 # we execute the config step to be sure to catch updated Kconfig files
586 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
587         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
588 else
589 # external modules needs include/generated/autoconf.h and include/config/auto.conf
590 # but do not care if they are up-to-date. Use auto.conf to trigger the test
591 PHONY += include/config/auto.conf
592 
593 include/config/auto.conf:
594         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
595         echo >&2;                                                       \
596         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
597         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
598         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
599         echo >&2 ;                                                      \
600         /bin/false)
601 
602 endif # KBUILD_EXTMOD
603 
604 else
605 # Dummy target needed, because used as prerequisite
606 include/config/auto.conf: ;
607 endif # $(dot-config)
608 
609 # The all: target is the default when no target is given on the
610 # command line.
611 # This allow a user to issue only 'make' to build a kernel including modules
612 # Defaults to vmlinux, but the arch makefile usually adds further targets
613 all: vmlinux
614 
615 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
616 # values of the respective KBUILD_* variables
617 ARCH_CPPFLAGS :=
618 ARCH_AFLAGS :=
619 ARCH_CFLAGS :=
620 include arch/$(SRCARCH)/Makefile
621 
622 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
623 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
624 
625 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
626 KBUILD_CFLAGS   += -Os
627 else
628 ifdef CONFIG_PROFILE_ALL_BRANCHES
629 KBUILD_CFLAGS   += -O2
630 else
631 KBUILD_CFLAGS   += -O2
632 endif
633 endif
634 
635 # Tell gcc to never replace conditional load with a non-conditional one
636 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
637 
638 include scripts/Makefile.gcc-plugins
639 
640 ifdef CONFIG_READABLE_ASM
641 # Disable optimizations that make assembler listings hard to read.
642 # reorder blocks reorders the control in the function
643 # ipa clone creates specialized cloned functions
644 # partial inlining inlines only parts of functions
645 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
646                  $(call cc-option,-fno-ipa-cp-clone,) \
647                  $(call cc-option,-fno-partial-inlining)
648 endif
649 
650 ifneq ($(CONFIG_FRAME_WARN),0)
651 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
652 endif
653 
654 # This selects the stack protector compiler flag. Testing it is delayed
655 # until after .config has been reprocessed, in the prepare-compiler-check
656 # target.
657 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
658   stackp-flag := -fstack-protector
659   stackp-name := REGULAR
660 else
661 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
662   stackp-flag := -fstack-protector-strong
663   stackp-name := STRONG
664 else
665   # Force off for distro compilers that enable stack protector by default.
666   stackp-flag := $(call cc-option, -fno-stack-protector)
667 endif
668 endif
669 # Find arch-specific stack protector compiler sanity-checking script.
670 ifdef CONFIG_CC_STACKPROTECTOR
671   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
672   stackp-check := $(wildcard $(stackp-path))
673 endif
674 KBUILD_CFLAGS += $(stackp-flag)
675 
676 ifeq ($(cc-name),clang)
677 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682 # Quiet clang warning: comparison of unsigned expression < 0 is always false
683 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
686 # See modpost pattern 2
687 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
688 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
689 else
690 
691 # These warnings generated too much noise in a regular build.
692 # Use make W=1 to enable them (see scripts/Makefile.build)
693 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
694 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
695 endif
696 
697 ifdef CONFIG_FRAME_POINTER
698 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
699 else
700 # Some targets (ARM with Thumb2, for example), can't be built with frame
701 # pointers.  For those, we don't have FUNCTION_TRACER automatically
702 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
703 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
704 # -fomit-frame-pointer with FUNCTION_TRACER.
705 ifndef CONFIG_FUNCTION_TRACER
706 KBUILD_CFLAGS   += -fomit-frame-pointer
707 endif
708 endif
709 
710 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
711 
712 ifdef CONFIG_DEBUG_INFO
713 ifdef CONFIG_DEBUG_INFO_SPLIT
714 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
715 else
716 KBUILD_CFLAGS   += -g
717 endif
718 KBUILD_AFLAGS   += -Wa,-gdwarf-2
719 endif
720 ifdef CONFIG_DEBUG_INFO_DWARF4
721 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
722 endif
723 
724 ifdef CONFIG_DEBUG_INFO_REDUCED
725 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
726                    $(call cc-option,-fno-var-tracking)
727 endif
728 
729 ifdef CONFIG_FUNCTION_TRACER
730 ifndef CC_FLAGS_FTRACE
731 CC_FLAGS_FTRACE := -pg
732 endif
733 export CC_FLAGS_FTRACE
734 ifdef CONFIG_HAVE_FENTRY
735 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
736 endif
737 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
738 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
739 ifdef CONFIG_DYNAMIC_FTRACE
740         ifdef CONFIG_HAVE_C_RECORDMCOUNT
741                 BUILD_C_RECORDMCOUNT := y
742                 export BUILD_C_RECORDMCOUNT
743         endif
744 endif
745 endif
746 
747 # We trigger additional mismatches with less inlining
748 ifdef CONFIG_DEBUG_SECTION_MISMATCH
749 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
750 endif
751 
752 # arch Makefile may override CC so keep this after arch Makefile is included
753 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
754 CHECKFLAGS     += $(NOSTDINC_FLAGS)
755 
756 # warn about C99 declaration after statement
757 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
758 
759 # disable pointer signed / unsigned warnings in gcc 4.0
760 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
761 
762 # disable invalid "can't wrap" optimizations for signed / pointers
763 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
764 
765 # conserve stack if available
766 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
767 
768 # disallow errors like 'EXPORT_GPL(foo);' with missing header
769 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
770 
771 # require functions to have arguments in prototypes, not empty 'int foo()'
772 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
773 
774 # Prohibit date/time macros, which would make the build non-deterministic
775 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
776 
777 # enforce correct pointer usage
778 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
779 
780 # use the deterministic mode of AR if available
781 KBUILD_ARFLAGS := $(call ar-option,D)
782 
783 # check for 'asm goto'
784 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
785         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
786         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
787 endif
788 
789 include scripts/Makefile.kasan
790 include scripts/Makefile.extrawarn
791 include scripts/Makefile.ubsan
792 
793 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
794 # last assignments
795 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
796 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
797 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
798 
799 # Use --build-id when available.
800 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
801                               $(call cc-ldoption, -Wl$(comma)--build-id,))
802 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
803 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
804 
805 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
806 LDFLAGS_vmlinux += $(call ld-option, -X,)
807 endif
808 
809 # Default kernel image to build when no specific target is given.
810 # KBUILD_IMAGE may be overruled on the command line or
811 # set in the environment
812 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
813 # this default value
814 export KBUILD_IMAGE ?= vmlinux
815 
816 #
817 # INSTALL_PATH specifies where to place the updated kernel and system map
818 # images. Default is /boot, but you can set it to other values
819 export  INSTALL_PATH ?= /boot
820 
821 #
822 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
823 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
824 # an argument if needed. Otherwise it defaults to the kernel install path
825 #
826 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
827 
828 #
829 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
830 # relocations required by build roots.  This is not defined in the
831 # makefile but the argument can be passed to make if needed.
832 #
833 
834 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
835 export MODLIB
836 
837 #
838 # INSTALL_MOD_STRIP, if defined, will cause modules to be
839 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
840 # the default option --strip-debug will be used.  Otherwise,
841 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
842 
843 ifdef INSTALL_MOD_STRIP
844 ifeq ($(INSTALL_MOD_STRIP),1)
845 mod_strip_cmd = $(STRIP) --strip-debug
846 else
847 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
848 endif # INSTALL_MOD_STRIP=1
849 else
850 mod_strip_cmd = true
851 endif # INSTALL_MOD_STRIP
852 export mod_strip_cmd
853 
854 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
855 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
856 # or CONFIG_MODULE_COMPRESS_XZ.
857 
858 mod_compress_cmd = true
859 ifdef CONFIG_MODULE_COMPRESS
860   ifdef CONFIG_MODULE_COMPRESS_GZIP
861     mod_compress_cmd = gzip -n -f
862   endif # CONFIG_MODULE_COMPRESS_GZIP
863   ifdef CONFIG_MODULE_COMPRESS_XZ
864     mod_compress_cmd = xz -f
865   endif # CONFIG_MODULE_COMPRESS_XZ
866 endif # CONFIG_MODULE_COMPRESS
867 export mod_compress_cmd
868 
869 # Select initial ramdisk compression format, default is gzip(1).
870 # This shall be used by the dracut(8) tool while creating an initramfs image.
871 #
872 INITRD_COMPRESS-y                  := gzip
873 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
874 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
875 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
876 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
877 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
878 # do not export INITRD_COMPRESS, since we didn't actually
879 # choose a sane default compression above.
880 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
881 
882 ifdef CONFIG_MODULE_SIG_ALL
883 $(eval $(call config_filename,MODULE_SIG_KEY))
884 
885 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
886 else
887 mod_sign_cmd = true
888 endif
889 export mod_sign_cmd
890 
891 
892 ifeq ($(KBUILD_EXTMOD),)
893 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
894 
895 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
896                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
897                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
898 
899 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
900                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
901 
902 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
903 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
904 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
905 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
906 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
907 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
908 libs-y          := $(libs-y1) $(libs-y2)
909 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
910 
911 # Externally visible symbols (used by link-vmlinux.sh)
912 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
913 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
914 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
915 export LDFLAGS_vmlinux
916 # used by scripts/pacmage/Makefile
917 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
918 
919 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
920 
921 # Include targets which we want to execute sequentially if the rest of the
922 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
923 # evaluated more than once.
924 PHONY += vmlinux_prereq
925 vmlinux_prereq: $(vmlinux-deps) FORCE
926 ifdef CONFIG_HEADERS_CHECK
927         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
928 endif
929 ifdef CONFIG_BUILD_DOCSRC
930         $(Q)$(MAKE) $(build)=Documentation
931 endif
932 ifdef CONFIG_GDB_SCRIPTS
933         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
934 endif
935 ifdef CONFIG_TRIM_UNUSED_KSYMS
936         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
937           "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
938 endif
939 
940 # standalone target for easier testing
941 include/generated/autoksyms.h: FORCE
942         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
943 
944 # Final link of vmlinux
945       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
946 quiet_cmd_link-vmlinux = LINK    $@
947 
948 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
949         +$(call if_changed,link-vmlinux)
950 
951 # Build samples along the rest of the kernel
952 ifdef CONFIG_SAMPLES
953 vmlinux-dirs += samples
954 endif
955 
956 # The actual objects are generated when descending,
957 # make sure no implicit rule kicks in
958 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
959 
960 # Handle descending into subdirectories listed in $(vmlinux-dirs)
961 # Preset locale variables to speed up the build process. Limit locale
962 # tweaks to this spot to avoid wrong language settings when running
963 # make menuconfig etc.
964 # Error messages still appears in the original language
965 
966 PHONY += $(vmlinux-dirs)
967 $(vmlinux-dirs): prepare scripts
968         $(Q)$(MAKE) $(build)=$@
969 
970 define filechk_kernel.release
971         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
972 endef
973 
974 # Store (new) KERNELRELEASE string in include/config/kernel.release
975 include/config/kernel.release: include/config/auto.conf FORCE
976         $(call filechk,kernel.release)
977 
978 
979 # Things we need to do before we recursively start building the kernel
980 # or the modules are listed in "prepare".
981 # A multi level approach is used. prepareN is processed before prepareN-1.
982 # archprepare is used in arch Makefiles and when processed asm symlink,
983 # version.h and scripts_basic is processed / created.
984 
985 # Listed in dependency order
986 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
987 
988 # prepare3 is used to check if we are building in a separate output directory,
989 # and if so do:
990 # 1) Check that make has not been executed in the kernel src $(srctree)
991 prepare3: include/config/kernel.release
992 ifneq ($(KBUILD_SRC),)
993         @$(kecho) '  Using $(srctree) as source for kernel'
994         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
995                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
996                 echo >&2 "  in the '$(srctree)' directory.";\
997                 /bin/false; \
998         fi;
999 endif
1000 
1001 # prepare2 creates a makefile if using a separate output directory.
1002 # From this point forward, .config has been reprocessed, so any rules
1003 # that need to depend on updated CONFIG_* values can be checked here.
1004 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1005 
1006 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1007                    include/config/auto.conf
1008         $(cmd_crmodverdir)
1009         $(Q)test -e include/generated/autoksyms.h || \
1010             touch   include/generated/autoksyms.h
1011 
1012 archprepare: archheaders archscripts prepare1 scripts_basic
1013 
1014 prepare0: archprepare gcc-plugins
1015         $(Q)$(MAKE) $(build)=.
1016 
1017 # All the preparing..
1018 prepare: prepare0 prepare-objtool
1019 
1020 ifdef CONFIG_STACK_VALIDATION
1021   has_libelf := $(call try-run,\
1022                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1023   ifeq ($(has_libelf),1)
1024     objtool_target := tools/objtool FORCE
1025   else
1026     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1027     SKIP_STACK_VALIDATION := 1
1028     export SKIP_STACK_VALIDATION
1029   endif
1030 endif
1031 
1032 PHONY += prepare-objtool
1033 prepare-objtool: $(objtool_target)
1034 
1035 # Check for CONFIG flags that require compiler support. Abort the build
1036 # after .config has been processed, but before the kernel build starts.
1037 #
1038 # For security-sensitive CONFIG options, we don't want to fallback and/or
1039 # silently change which compiler flags will be used, since that leads to
1040 # producing kernels with different security feature characteristics
1041 # depending on the compiler used. (For example, "But I selected
1042 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1043 PHONY += prepare-compiler-check
1044 prepare-compiler-check: FORCE
1045 # Make sure compiler supports requested stack protector flag.
1046 ifdef stackp-name
1047   ifeq ($(call cc-option, $(stackp-flag)),)
1048         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1049                   $(stackp-flag) not supported by compiler >&2 && exit 1
1050   endif
1051 endif
1052 # Make sure compiler does not have buggy stack-protector support.
1053 ifdef stackp-check
1054   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1055         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1056                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1057   endif
1058 endif
1059         @:
1060 
1061 # Generate some files
1062 # ---------------------------------------------------------------------------
1063 
1064 # KERNELRELEASE can change from a few different places, meaning version.h
1065 # needs to be updated, so this check is forced on all builds
1066 
1067 uts_len := 64
1068 define filechk_utsrelease.h
1069         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1070           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1071           exit 1;                                                         \
1072         fi;                                                               \
1073         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1074 endef
1075 
1076 define filechk_version.h
1077         (echo \#define LINUX_VERSION_CODE $(shell                         \
1078         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1079         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1080 endef
1081 
1082 $(version_h): $(srctree)/Makefile FORCE
1083         $(call filechk,version.h)
1084         $(Q)rm -f $(old_version_h)
1085 
1086 include/generated/utsrelease.h: include/config/kernel.release FORCE
1087         $(call filechk,utsrelease.h)
1088 
1089 PHONY += headerdep
1090 headerdep:
1091         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1092         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1093 
1094 # ---------------------------------------------------------------------------
1095 # Firmware install
1096 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1097 export INSTALL_FW_PATH
1098 
1099 PHONY += firmware_install
1100 firmware_install:
1101         @mkdir -p $(objtree)/firmware
1102         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1103 
1104 # ---------------------------------------------------------------------------
1105 # Kernel headers
1106 
1107 #Default location for installed headers
1108 export INSTALL_HDR_PATH = $(objtree)/usr
1109 
1110 # If we do an all arch process set dst to asm-$(hdr-arch)
1111 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1112 
1113 PHONY += archheaders
1114 archheaders:
1115 
1116 PHONY += archscripts
1117 archscripts:
1118 
1119 PHONY += __headers
1120 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1121         $(Q)$(MAKE) $(build)=scripts build_unifdef
1122 
1123 PHONY += headers_install_all
1124 headers_install_all:
1125         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1126 
1127 PHONY += headers_install
1128 headers_install: __headers
1129         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1130           $(error Headers not exportable for the $(SRCARCH) architecture))
1131         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1132         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1133 
1134 PHONY += headers_check_all
1135 headers_check_all: headers_install_all
1136         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1137 
1138 PHONY += headers_check
1139 headers_check: headers_install
1140         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1141         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1142 
1143 # ---------------------------------------------------------------------------
1144 # Kernel selftest
1145 
1146 PHONY += kselftest
1147 kselftest:
1148         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1149 
1150 kselftest-clean:
1151         $(Q)$(MAKE) -C tools/testing/selftests clean
1152 
1153 PHONY += kselftest-merge
1154 kselftest-merge:
1155         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1156         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1157                 -m $(objtree)/.config \
1158                 $(srctree)/tools/testing/selftests/*/config
1159         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1160 
1161 # ---------------------------------------------------------------------------
1162 # Modules
1163 
1164 ifdef CONFIG_MODULES
1165 
1166 # By default, build modules as well
1167 
1168 all: modules
1169 
1170 # Build modules
1171 #
1172 # A module can be listed more than once in obj-m resulting in
1173 # duplicate lines in modules.order files.  Those are removed
1174 # using awk while concatenating to the final file.
1175 
1176 PHONY += modules
1177 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1178         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1179         @$(kecho) '  Building modules, stage 2.';
1180         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1181         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1182 
1183 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1184         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1185 
1186 %/modules.builtin: include/config/auto.conf
1187         $(Q)$(MAKE) $(modbuiltin)=$*
1188 
1189 
1190 # Target to prepare building external modules
1191 PHONY += modules_prepare
1192 modules_prepare: prepare scripts
1193 
1194 # Target to install modules
1195 PHONY += modules_install
1196 modules_install: _modinst_ _modinst_post
1197 
1198 PHONY += _modinst_
1199 _modinst_:
1200         @rm -rf $(MODLIB)/kernel
1201         @rm -f $(MODLIB)/source
1202         @mkdir -p $(MODLIB)/kernel
1203         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1204         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1205                 rm -f $(MODLIB)/build ; \
1206                 ln -s $(CURDIR) $(MODLIB)/build ; \
1207         fi
1208         @cp -f $(objtree)/modules.order $(MODLIB)/
1209         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1210         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1211 
1212 # This depmod is only for convenience to give the initial
1213 # boot a modules.dep even before / is mounted read-write.  However the
1214 # boot script depmod is the master version.
1215 PHONY += _modinst_post
1216 _modinst_post: _modinst_
1217         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1218         $(call cmd,depmod)
1219 
1220 ifeq ($(CONFIG_MODULE_SIG), y)
1221 PHONY += modules_sign
1222 modules_sign:
1223         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1224 endif
1225 
1226 else # CONFIG_MODULES
1227 
1228 # Modules not configured
1229 # ---------------------------------------------------------------------------
1230 
1231 PHONY += modules modules_install
1232 modules modules_install:
1233         @echo >&2
1234         @echo >&2 "The present kernel configuration has modules disabled."
1235         @echo >&2 "Type 'make config' and enable loadable module support."
1236         @echo >&2 "Then build a kernel with module support enabled."
1237         @echo >&2
1238         @exit 1
1239 
1240 endif # CONFIG_MODULES
1241 
1242 ###
1243 # Cleaning is done on three levels.
1244 # make clean     Delete most generated files
1245 #                Leave enough to build external modules
1246 # make mrproper  Delete the current configuration, and all generated files
1247 # make distclean Remove editor backup files, patch leftover files and the like
1248 
1249 # Directories & files removed with 'make clean'
1250 CLEAN_DIRS  += $(MODVERDIR)
1251 
1252 # Directories & files removed with 'make mrproper'
1253 MRPROPER_DIRS  += include/config usr/include include/generated          \
1254                   arch/*/include/generated .tmp_objdiff
1255 MRPROPER_FILES += .config .config.old .version .old_version \
1256                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1257                   signing_key.pem signing_key.priv signing_key.x509     \
1258                   x509.genkey extra_certificates signing_key.x509.keyid \
1259                   signing_key.x509.signer vmlinux-gdb.py
1260 
1261 # clean - Delete most, but leave enough to build external modules
1262 #
1263 clean: rm-dirs  := $(CLEAN_DIRS)
1264 clean: rm-files := $(CLEAN_FILES)
1265 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1266 
1267 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1268 $(clean-dirs):
1269         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1270 
1271 vmlinuxclean:
1272         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1273 
1274 clean: archclean vmlinuxclean
1275 
1276 # mrproper - Delete all generated files, including .config
1277 #
1278 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1279 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1280 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1281 
1282 PHONY += $(mrproper-dirs) mrproper archmrproper
1283 $(mrproper-dirs):
1284         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1285 
1286 mrproper: clean archmrproper $(mrproper-dirs)
1287         $(call cmd,rmdirs)
1288         $(call cmd,rmfiles)
1289 
1290 # distclean
1291 #
1292 PHONY += distclean
1293 
1294 distclean: mrproper
1295         @find $(srctree) $(RCS_FIND_IGNORE) \
1296                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1297                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1298                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1299                 -type f -print | xargs rm -f
1300 
1301 
1302 # Packaging of the kernel to various formats
1303 # ---------------------------------------------------------------------------
1304 # rpm target kept for backward compatibility
1305 package-dir     := scripts/package
1306 
1307 %src-pkg: FORCE
1308         $(Q)$(MAKE) $(build)=$(package-dir) $@
1309 %pkg: include/config/kernel.release FORCE
1310         $(Q)$(MAKE) $(build)=$(package-dir) $@
1311 rpm: include/config/kernel.release FORCE
1312         $(Q)$(MAKE) $(build)=$(package-dir) $@
1313 
1314 
1315 # Brief documentation of the typical targets used
1316 # ---------------------------------------------------------------------------
1317 
1318 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1319 boards := $(sort $(notdir $(boards)))
1320 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1321 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1322 
1323 PHONY += help
1324 help:
1325         @echo  'Cleaning targets:'
1326         @echo  '  clean           - Remove most generated files but keep the config and'
1327         @echo  '                    enough build support to build external modules'
1328         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1329         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1330         @echo  ''
1331         @echo  'Configuration targets:'
1332         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1333         @echo  ''
1334         @echo  'Other generic targets:'
1335         @echo  '  all             - Build all targets marked with [*]'
1336         @echo  '* vmlinux         - Build the bare kernel'
1337         @echo  '* modules         - Build all modules'
1338         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1339         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1340         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1341         @echo  '  dir/            - Build all files in dir and below'
1342         @echo  '  dir/file.[ois]  - Build specified target only'
1343         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1344         @echo  '                    (requires a recent binutils and recent build (System.map))'
1345         @echo  '  dir/file.ko     - Build module including final link'
1346         @echo  '  modules_prepare - Set up for building external modules'
1347         @echo  '  tags/TAGS       - Generate tags file for editors'
1348         @echo  '  cscope          - Generate cscope index'
1349         @echo  '  gtags           - Generate GNU GLOBAL index'
1350         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1351         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1352         @echo  '  image_name      - Output the image name (use with make -s)'
1353         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1354          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1355          echo  ''
1356         @echo  'Static analysers'
1357         @echo  '  checkstack      - Generate a list of stack hogs'
1358         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1359         @echo  '  versioncheck    - Sanity check on version.h usage'
1360         @echo  '  includecheck    - Check for duplicate included header files'
1361         @echo  '  export_report   - List the usages of all exported symbols'
1362         @echo  '  headers_check   - Sanity check on exported headers'
1363         @echo  '  headerdep       - Detect inclusion cycles in headers'
1364         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1365         @echo  ''
1366         @echo  'Kernel selftest'
1367         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1368         @echo  '                    Build, install, and boot kernel before'
1369         @echo  '                    running kselftest on it'
1370         @echo  '  kselftest-clean - Remove all generated kselftest files'
1371         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1372         @echo  '                    .config.'
1373         @echo  ''
1374         @echo  'Kernel packaging:'
1375         @$(MAKE) $(build)=$(package-dir) help
1376         @echo  ''
1377         @echo  'Documentation targets:'
1378         @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1379         @echo  ''
1380         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1381         @echo  ''
1382         @echo  'Architecture specific targets ($(SRCARCH)):'
1383         @$(if $(archhelp),$(archhelp),\
1384                 echo '  No architecture specific help defined for $(SRCARCH)')
1385         @echo  ''
1386         @$(if $(boards), \
1387                 $(foreach b, $(boards), \
1388                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1389                 echo '')
1390         @$(if $(board-dirs), \
1391                 $(foreach b, $(board-dirs), \
1392                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1393                 printf "  %-16s - Show all of the above\\n" help-boards; \
1394                 echo '')
1395 
1396         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1397         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1398         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1399         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1400         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1401         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1402         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1403         @echo  '                1: warnings which may be relevant and do not occur too often'
1404         @echo  '                2: warnings which occur quite often but may still be relevant'
1405         @echo  '                3: more obscure warnings, can most likely be ignored'
1406         @echo  '                Multiple levels can be combined with W=12 or W=123'
1407         @echo  ''
1408         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1409         @echo  'For further info see the ./README file'
1410 
1411 
1412 help-board-dirs := $(addprefix help-,$(board-dirs))
1413 
1414 help-boards: $(help-board-dirs)
1415 
1416 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1417 
1418 $(help-board-dirs): help-%:
1419         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1420         @$(if $(boards-per-dir), \
1421                 $(foreach b, $(boards-per-dir), \
1422                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1423                 echo '')
1424 
1425 
1426 # Documentation targets
1427 # ---------------------------------------------------------------------------
1428 DOC_TARGETS := xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1429 PHONY += $(DOC_TARGETS)
1430 $(DOC_TARGETS): scripts_basic FORCE
1431         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1432         $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1433         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1434 
1435 else # KBUILD_EXTMOD
1436 
1437 ###
1438 # External module support.
1439 # When building external modules the kernel used as basis is considered
1440 # read-only, and no consistency checks are made and the make
1441 # system is not used on the basis kernel. If updates are required
1442 # in the basis kernel ordinary make commands (without M=...) must
1443 # be used.
1444 #
1445 # The following are the only valid targets when building external
1446 # modules.
1447 # make M=dir clean     Delete all automatically generated files
1448 # make M=dir modules   Make all modules in specified dir
1449 # make M=dir           Same as 'make M=dir modules'
1450 # make M=dir modules_install
1451 #                      Install the modules built in the module directory
1452 #                      Assumes install directory is already created
1453 
1454 # We are always building modules
1455 KBUILD_MODULES := 1
1456 PHONY += crmodverdir
1457 crmodverdir:
1458         $(cmd_crmodverdir)
1459 
1460 PHONY += $(objtree)/Module.symvers
1461 $(objtree)/Module.symvers:
1462         @test -e $(objtree)/Module.symvers || ( \
1463         echo; \
1464         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1465         echo "           is missing; modules will have no dependencies and modversions."; \
1466         echo )
1467 
1468 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1469 PHONY += $(module-dirs) modules
1470 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1471         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1472 
1473 modules: $(module-dirs)
1474         @$(kecho) '  Building modules, stage 2.';
1475         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1476 
1477 PHONY += modules_install
1478 modules_install: _emodinst_ _emodinst_post
1479 
1480 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1481 PHONY += _emodinst_
1482 _emodinst_:
1483         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1484         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1485 
1486 PHONY += _emodinst_post
1487 _emodinst_post: _emodinst_
1488         $(call cmd,depmod)
1489 
1490 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1491 
1492 PHONY += $(clean-dirs) clean
1493 $(clean-dirs):
1494         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1495 
1496 clean:  rm-dirs := $(MODVERDIR)
1497 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1498 
1499 PHONY += help
1500 help:
1501         @echo  '  Building external modules.'
1502         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1503         @echo  ''
1504         @echo  '  modules         - default target, build the module(s)'
1505         @echo  '  modules_install - install the module'
1506         @echo  '  clean           - remove generated files in module directory only'
1507         @echo  ''
1508 
1509 # Dummies...
1510 PHONY += prepare scripts
1511 prepare: ;
1512 scripts: ;
1513 endif # KBUILD_EXTMOD
1514 
1515 clean: $(clean-dirs)
1516         $(call cmd,rmdirs)
1517         $(call cmd,rmfiles)
1518         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1519                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1520                 -o -name '*.ko.*' \
1521                 -o -name '*.dwo'  \
1522                 -o -name '*.su'  \
1523                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1524                 -o -name '*.symtypes' -o -name 'modules.order' \
1525                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1526                 -o -name '*.c.[012]*.*' \
1527                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1528 
1529 # Generate tags for editors
1530 # ---------------------------------------------------------------------------
1531 quiet_cmd_tags = GEN     $@
1532       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1533 
1534 tags TAGS cscope gtags: FORCE
1535         $(call cmd,tags)
1536 
1537 # Scripts to check various things for consistency
1538 # ---------------------------------------------------------------------------
1539 
1540 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1541 
1542 includecheck:
1543         find $(srctree)/* $(RCS_FIND_IGNORE) \
1544                 -name '*.[hcS]' -type f -print | sort \
1545                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1546 
1547 versioncheck:
1548         find $(srctree)/* $(RCS_FIND_IGNORE) \
1549                 -name '*.[hcS]' -type f -print | sort \
1550                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1551 
1552 coccicheck:
1553         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1554 
1555 namespacecheck:
1556         $(PERL) $(srctree)/scripts/namespace.pl
1557 
1558 export_report:
1559         $(PERL) $(srctree)/scripts/export_report.pl
1560 
1561 endif #ifeq ($(config-targets),1)
1562 endif #ifeq ($(mixed-targets),1)
1563 
1564 PHONY += checkstack kernelrelease kernelversion image_name
1565 
1566 # UML needs a little special treatment here.  It wants to use the host
1567 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1568 # else wants $(ARCH), including people doing cross-builds, which means
1569 # that $(SUBARCH) doesn't work here.
1570 ifeq ($(ARCH), um)
1571 CHECKSTACK_ARCH := $(SUBARCH)
1572 else
1573 CHECKSTACK_ARCH := $(ARCH)
1574 endif
1575 checkstack:
1576         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1577         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1578 
1579 kernelrelease:
1580         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1581 
1582 kernelversion:
1583         @echo $(KERNELVERSION)
1584 
1585 image_name:
1586         @echo $(KBUILD_IMAGE)
1587 
1588 # Clear a bunch of variables before executing the submake
1589 tools/: FORCE
1590         $(Q)mkdir -p $(objtree)/tools
1591         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1592 
1593 tools/%: FORCE
1594         $(Q)mkdir -p $(objtree)/tools
1595         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1596 
1597 # Single targets
1598 # ---------------------------------------------------------------------------
1599 # Single targets are compatible with:
1600 # - build with mixed source and output
1601 # - build with separate output dir 'make O=...'
1602 # - external modules
1603 #
1604 #  target-dir => where to store outputfile
1605 #  build-dir  => directory in kernel source tree to use
1606 
1607 ifeq ($(KBUILD_EXTMOD),)
1608         build-dir  = $(patsubst %/,%,$(dir $@))
1609         target-dir = $(dir $@)
1610 else
1611         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1612         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1613         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1614 endif
1615 
1616 %.s: %.c prepare scripts FORCE
1617         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1618 %.i: %.c prepare scripts FORCE
1619         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1620 %.o: %.c prepare scripts FORCE
1621         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1622 %.lst: %.c prepare scripts FORCE
1623         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1624 %.s: %.S prepare scripts FORCE
1625         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1626 %.o: %.S prepare scripts FORCE
1627         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1628 %.symtypes: %.c prepare scripts FORCE
1629         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1630 
1631 # Modules
1632 /: prepare scripts FORCE
1633         $(cmd_crmodverdir)
1634         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1635         $(build)=$(build-dir)
1636 # Make sure the latest headers are built for Documentation
1637 Documentation/ samples/: headers_install
1638 %/: prepare scripts FORCE
1639         $(cmd_crmodverdir)
1640         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1641         $(build)=$(build-dir)
1642 %.ko: prepare scripts FORCE
1643         $(cmd_crmodverdir)
1644         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1645         $(build)=$(build-dir) $(@:.ko=.o)
1646         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1647 
1648 # FIXME Should go into a make.lib or something
1649 # ===========================================================================
1650 
1651 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1652       cmd_rmdirs = rm -rf $(rm-dirs)
1653 
1654 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1655       cmd_rmfiles = rm -f $(rm-files)
1656 
1657 # Run depmod only if we have System.map and depmod is executable
1658 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1659       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1660                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1661 
1662 # Create temporary dir for module support files
1663 # clean it up only when building all modules
1664 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1665                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1666 
1667 # read all saved command lines
1668 
1669 targets := $(wildcard $(sort $(targets)))
1670 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1671 
1672 ifneq ($(cmd_files),)
1673   $(cmd_files): ;       # Do not try to update included dependency files
1674   include $(cmd_files)
1675 endif
1676 
1677 endif   # skip-makefile
1678 
1679 PHONY += FORCE
1680 FORCE:
1681 
1682 # Declare the contents of the .PHONY variable as phony.  We keep that
1683 # information in a variable so we can use it in if_changed and friends.
1684 .PHONY: $(PHONY)

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