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

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