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 = 3
  2 PATCHLEVEL = 16
  3 SUBLEVEL = 0
  4 EXTRAVERSION =
  5 NAME = Shuffling Zombie Juror
  6 
  7 # *DOCUMENTATION*
  8 # To see a list of typical targets execute "make help"
  9 # More info can be located in ./README
 10 # Comments in this file are targeted only to the developer, do not
 11 # expect to learn how to build the kernel reading this file.
 12 
 13 # Do not:
 14 # o  use make's built-in rules and variables
 15 #    (this increases performance and avoids hard-to-debug behaviour);
 16 # o  print "Entering directory ...";
 17 MAKEFLAGS += -rR --no-print-directory
 18 
 19 # Avoid funny character set dependencies
 20 unexport LC_ALL
 21 LC_COLLATE=C
 22 LC_NUMERIC=C
 23 export LC_COLLATE LC_NUMERIC
 24 
 25 # Avoid interference with shell env settings
 26 unexport GREP_OPTIONS
 27 
 28 # We are using a recursive build, so we need to do a little thinking
 29 # to get the ordering right.
 30 #
 31 # Most importantly: sub-Makefiles should only ever modify files in
 32 # their own directory. If in some directory we have a dependency on
 33 # a file in another dir (which doesn't happen often, but it's often
 34 # unavoidable when linking the built-in.o targets which finally
 35 # turn into vmlinux), we will call a sub make in that other dir, and
 36 # after that we are sure that everything which is in that other dir
 37 # is now up to date.
 38 #
 39 # The only cases where we need to modify files which have global
 40 # effects are thus separated out and done before the recursive
 41 # descending is started. They are now explicitly listed as the
 42 # prepare rule.
 43 
 44 # Beautify output
 45 # ---------------------------------------------------------------------------
 46 #
 47 # Normally, we echo the whole command before executing it. By making
 48 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 49 # $(quiet) to choose other forms of output instead, e.g.
 50 #
 51 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 52 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 53 #
 54 # If $(quiet) is empty, the whole command will be printed.
 55 # If it is set to "quiet_", only the short version will be printed.
 56 # If it is set to "silent_", nothing will be printed at all, since
 57 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 58 #
 59 # A simple variant is to prefix commands with $(Q) - that's useful
 60 # for commands that shall be hidden in non-verbose mode.
 61 #
 62 #       $(Q)ln $@ :<
 63 #
 64 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 65 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 66 #
 67 # To put more focus on warnings, be less verbose as default
 68 # Use 'make V=1' to see the full commands
 69 
 70 ifeq ("$(origin V)", "command line")
 71   KBUILD_VERBOSE = $(V)
 72 endif
 73 ifndef KBUILD_VERBOSE
 74   KBUILD_VERBOSE = 0
 75 endif
 76 
 77 ifeq ($(KBUILD_VERBOSE),1)
 78   quiet =
 79   Q =
 80 else
 81   quiet=quiet_
 82   Q = @
 83 endif
 84 
 85 # If the user is running make -s (silent mode), suppress echoing of
 86 # commands
 87 
 88 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 89 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 90   quiet=silent_
 91 endif
 92 else                                    # make-3.8x
 93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 94   quiet=silent_
 95 endif
 96 endif
 97 
 98 export quiet Q KBUILD_VERBOSE
 99 
100 # Call a source code checker (by default, "sparse") as part of the
101 # C compilation.
102 #
103 # Use 'make C=1' to enable checking of only re-compiled files.
104 # Use 'make C=2' to enable checking of *all* source files, regardless
105 # of whether they are re-compiled or not.
106 #
107 # See the file "Documentation/sparse.txt" for more details, including
108 # where to get the "sparse" utility.
109 
110 ifeq ("$(origin C)", "command line")
111   KBUILD_CHECKSRC = $(C)
112 endif
113 ifndef KBUILD_CHECKSRC
114   KBUILD_CHECKSRC = 0
115 endif
116 
117 # Use make M=dir to specify directory of external module to build
118 # Old syntax make ... SUBDIRS=$PWD is still supported
119 # Setting the environment variable KBUILD_EXTMOD take precedence
120 ifdef SUBDIRS
121   KBUILD_EXTMOD ?= $(SUBDIRS)
122 endif
123 
124 ifeq ("$(origin M)", "command line")
125   KBUILD_EXTMOD := $(M)
126 endif
127 
128 # kbuild supports saving output files in a separate directory.
129 # To locate output files in a separate directory two syntaxes are supported.
130 # In both cases the working directory must be the root of the kernel src.
131 # 1) O=
132 # Use "make O=dir/to/store/output/files/"
133 #
134 # 2) Set KBUILD_OUTPUT
135 # Set the environment variable KBUILD_OUTPUT to point to the directory
136 # where the output files shall be placed.
137 # export KBUILD_OUTPUT=dir/to/store/output/files/
138 # make
139 #
140 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
141 # variable.
142 
143 
144 # KBUILD_SRC is set on invocation of make in OBJ directory
145 # KBUILD_SRC is not intended to be used by the regular user (for now)
146 ifeq ($(KBUILD_SRC),)
147 
148 # OK, Make called in directory where kernel src resides
149 # Do we want to locate output files in a separate directory?
150 ifeq ("$(origin O)", "command line")
151   KBUILD_OUTPUT := $(O)
152 endif
153 
154 # That's our default target when none is given on the command line
155 PHONY := _all
156 _all:
157 
158 # Cancel implicit rules on top Makefile
159 $(CURDIR)/Makefile Makefile: ;
160 
161 ifneq ($(KBUILD_OUTPUT),)
162 # Invoke a second make in the output directory, passing relevant variables
163 # check that the output directory actually exists
164 saved-output := $(KBUILD_OUTPUT)
165 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
166                                                                 && /bin/pwd)
167 $(if $(KBUILD_OUTPUT),, \
168      $(error failed to create output directory "$(saved-output)"))
169 
170 PHONY += $(MAKECMDGOALS) sub-make
171 
172 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
173         @:
174 
175 # Fake the "Entering directory" message once, so that IDEs/editors are
176 # able to understand relative filenames.
177        echodir := @echo
178  quiet_echodir := @echo
179 silent_echodir := @:
180 sub-make: FORCE
181         $($(quiet)echodir) "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
182         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
183         KBUILD_SRC=$(CURDIR) \
184         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
185         $(filter-out _all sub-make,$(MAKECMDGOALS))
186 
187 # Leave processing to above invocation of make
188 skip-makefile := 1
189 endif # ifneq ($(KBUILD_OUTPUT),)
190 endif # ifeq ($(KBUILD_SRC),)
191 
192 # We process the rest of the Makefile if this is the final invocation of make
193 ifeq ($(skip-makefile),)
194 
195 # If building an external module we do not care about the all: rule
196 # but instead _all depend on modules
197 PHONY += all
198 ifeq ($(KBUILD_EXTMOD),)
199 _all: all
200 else
201 _all: modules
202 endif
203 
204 ifeq ($(KBUILD_SRC),)
205         # building in the source tree
206         srctree := .
207 else
208         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
209                 # building in a subdirectory of the source tree
210                 srctree := ..
211         else
212                 srctree := $(KBUILD_SRC)
213         endif
214 endif
215 objtree         := .
216 src             := $(srctree)
217 obj             := $(objtree)
218 
219 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
220 
221 export srctree objtree VPATH
222 
223 
224 # SUBARCH tells the usermode build what the underlying arch is.  That is set
225 # first, and if a usermode build is happening, the "ARCH=um" on the command
226 # line overrides the setting of ARCH below.  If a native build is happening,
227 # then ARCH is assigned, getting whatever value it gets normally, and
228 # SUBARCH is subsequently ignored.
229 
230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231                                   -e s/sun4u/sparc64/ \
232                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
233                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
234                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
236 
237 # Cross compiling and selecting different set of gcc/bin-utils
238 # ---------------------------------------------------------------------------
239 #
240 # When performing cross compilation for other architectures ARCH shall be set
241 # to the target architecture. (See arch/* for the possibilities).
242 # ARCH can be set during invocation of make:
243 # make ARCH=ia64
244 # Another way is to have ARCH set in the environment.
245 # The default ARCH is the host where make is executed.
246 
247 # CROSS_COMPILE specify the prefix used for all executables used
248 # during compilation. Only gcc and related bin-utils executables
249 # are prefixed with $(CROSS_COMPILE).
250 # CROSS_COMPILE can be set on the command line
251 # make CROSS_COMPILE=ia64-linux-
252 # Alternatively CROSS_COMPILE can be set in the environment.
253 # A third alternative is to store a setting in .config so that plain
254 # "make" in the configured kernel build directory always uses that.
255 # Default value for CROSS_COMPILE is not to prefix executables
256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
257 ARCH            ?= $(SUBARCH)
258 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
259 
260 # Architecture as present in compile.h
261 UTS_MACHINE     := $(ARCH)
262 SRCARCH         := $(ARCH)
263 
264 # Additional ARCH settings for x86
265 ifeq ($(ARCH),i386)
266         SRCARCH := x86
267 endif
268 ifeq ($(ARCH),x86_64)
269         SRCARCH := x86
270 endif
271 
272 # Additional ARCH settings for sparc
273 ifeq ($(ARCH),sparc32)
274        SRCARCH := sparc
275 endif
276 ifeq ($(ARCH),sparc64)
277        SRCARCH := sparc
278 endif
279 
280 # Additional ARCH settings for sh
281 ifeq ($(ARCH),sh64)
282        SRCARCH := sh
283 endif
284 
285 # Additional ARCH settings for tile
286 ifeq ($(ARCH),tilepro)
287        SRCARCH := tile
288 endif
289 ifeq ($(ARCH),tilegx)
290        SRCARCH := tile
291 endif
292 
293 # Where to locate arch specific headers
294 hdr-arch  := $(SRCARCH)
295 
296 KCONFIG_CONFIG  ?= .config
297 export KCONFIG_CONFIG
298 
299 # SHELL used by kbuild
300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301           else if [ -x /bin/bash ]; then echo /bin/bash; \
302           else echo sh; fi ; fi)
303 
304 HOSTCC       = gcc
305 HOSTCXX      = g++
306 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
307 HOSTCXXFLAGS = -O2
308 
309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
311                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
312 endif
313 
314 # Decide whether to build built-in, modular, or both.
315 # Normally, just do built-in.
316 
317 KBUILD_MODULES :=
318 KBUILD_BUILTIN := 1
319 
320 # If we have only "make modules", don't compile built-in objects.
321 # When we're building modules with modversions, we need to consider
322 # the built-in objects during the descend as well, in order to
323 # make sure the checksums are up to date before we record them.
324 
325 ifeq ($(MAKECMDGOALS),modules)
326   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327 endif
328 
329 # If we have "make <whatever> modules", compile modules
330 # in addition to whatever we do anyway.
331 # Just "make" or "make all" shall build modules as well
332 
333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
334   KBUILD_MODULES := 1
335 endif
336 
337 ifeq ($(MAKECMDGOALS),)
338   KBUILD_MODULES := 1
339 endif
340 
341 export KBUILD_MODULES KBUILD_BUILTIN
342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
343 
344 ifneq ($(CC),)
345 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
346 COMPILER := clang
347 else
348 COMPILER := gcc
349 endif
350 export COMPILER
351 endif
352 
353 # Look for make include files relative to root of kernel src
354 MAKEFLAGS += --include-dir=$(srctree)
355 
356 # We need some generic definitions (do not try to remake the file).
357 $(srctree)/scripts/Kbuild.include: ;
358 include $(srctree)/scripts/Kbuild.include
359 
360 # Make variables (CC, etc...)
361 AS              = $(CROSS_COMPILE)as
362 LD              = $(CROSS_COMPILE)ld
363 CC              = $(CROSS_COMPILE)gcc
364 CPP             = $(CC) -E
365 AR              = $(CROSS_COMPILE)ar
366 NM              = $(CROSS_COMPILE)nm
367 STRIP           = $(CROSS_COMPILE)strip
368 OBJCOPY         = $(CROSS_COMPILE)objcopy
369 OBJDUMP         = $(CROSS_COMPILE)objdump
370 AWK             = awk
371 GENKSYMS        = scripts/genksyms/genksyms
372 INSTALLKERNEL  := installkernel
373 DEPMOD          = /sbin/depmod
374 PERL            = perl
375 CHECK           = sparse
376 
377 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
378                   -Wbitwise -Wno-return-void $(CF)
379 CFLAGS_MODULE   =
380 AFLAGS_MODULE   =
381 LDFLAGS_MODULE  =
382 CFLAGS_KERNEL   =
383 AFLAGS_KERNEL   =
384 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
385 
386 
387 # Use USERINCLUDE when you must reference the UAPI directories only.
388 USERINCLUDE    := \
389                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
390                 -Iarch/$(hdr-arch)/include/generated/uapi \
391                 -I$(srctree)/include/uapi \
392                 -Iinclude/generated/uapi \
393                 -include $(srctree)/include/linux/kconfig.h
394 
395 # Use LINUXINCLUDE when you must reference the include/ directory.
396 # Needed to be compatible with the O= option
397 LINUXINCLUDE    := \
398                 -I$(srctree)/arch/$(hdr-arch)/include \
399                 -Iarch/$(hdr-arch)/include/generated \
400                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
401                 -Iinclude \
402                 $(USERINCLUDE)
403 
404 KBUILD_CPPFLAGS := -D__KERNEL__
405 
406 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
407                    -fno-strict-aliasing -fno-common \
408                    -Werror-implicit-function-declaration \
409                    -Wno-format-security
410 
411 KBUILD_AFLAGS_KERNEL :=
412 KBUILD_CFLAGS_KERNEL :=
413 KBUILD_AFLAGS   := -D__ASSEMBLY__
414 KBUILD_AFLAGS_MODULE  := -DMODULE
415 KBUILD_CFLAGS_MODULE  := -DMODULE
416 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
417 
418 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
419 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
420 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
421 
422 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
423 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
424 export CPP AR NM STRIP OBJCOPY OBJDUMP
425 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
426 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427 
428 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
429 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
430 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
431 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
432 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
433 export KBUILD_ARFLAGS
434 
435 # When compiling out-of-tree modules, put MODVERDIR in the module
436 # tree rather than in the kernel tree. The kernel tree might
437 # even be read-only.
438 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
439 
440 # Files to ignore in find ... statements
441 
442 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
443                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
444                           -prune -o
445 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
446                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
447 
448 # ===========================================================================
449 # Rules shared between *config targets and build targets
450 
451 # Basic helpers built in scripts/
452 PHONY += scripts_basic
453 scripts_basic:
454         $(Q)$(MAKE) $(build)=scripts/basic
455         $(Q)rm -f .tmp_quiet_recordmcount
456 
457 # To avoid any implicit rule to kick in, define an empty command.
458 scripts/basic/%: scripts_basic ;
459 
460 PHONY += outputmakefile
461 # outputmakefile generates a Makefile in the output directory, if using a
462 # separate output directory. This allows convenient use of make in the
463 # output directory.
464 outputmakefile:
465 ifneq ($(KBUILD_SRC),)
466         $(Q)ln -fsn $(srctree) source
467         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
468             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
469 endif
470 
471 # Support for using generic headers in asm-generic
472 PHONY += asm-generic
473 asm-generic:
474         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
475                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
476         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
477                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
478 
479 # To make sure we do not include .config for any of the *config targets
480 # catch them early, and hand them over to scripts/kconfig/Makefile
481 # It is allowed to specify more targets when calling make, including
482 # mixing *config targets and build targets.
483 # For example 'make oldconfig all'.
484 # Detect when mixed targets is specified, and make a second invocation
485 # of make so .config is not included in this case either (for *config).
486 
487 version_h := include/generated/uapi/linux/version.h
488 
489 no-dot-config-targets := clean mrproper distclean \
490                          cscope gtags TAGS tags help %docs check% coccicheck \
491                          $(version_h) headers_% archheaders archscripts \
492                          kernelversion %src-pkg
493 
494 config-targets := 0
495 mixed-targets  := 0
496 dot-config     := 1
497 
498 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
499         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
500                 dot-config := 0
501         endif
502 endif
503 
504 ifeq ($(KBUILD_EXTMOD),)
505         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
506                 config-targets := 1
507                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
508                         mixed-targets := 1
509                 endif
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 $(srctree)/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
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 endif # KBUILD_EXTMOD
568 
569 ifeq ($(dot-config),1)
570 # Read in config
571 -include include/config/auto.conf
572 
573 ifeq ($(KBUILD_EXTMOD),)
574 # Read in dependencies to all Kconfig* files, make sure to run
575 # oldconfig if changes are detected.
576 -include include/config/auto.conf.cmd
577 
578 # To avoid any implicit rule to kick in, define an empty command
579 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
580 
581 # If .config is newer than include/config/auto.conf, someone tinkered
582 # with it and forgot to run make oldconfig.
583 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
584 # we execute the config step to be sure to catch updated Kconfig files
585 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
586         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
587 else
588 # external modules needs include/generated/autoconf.h and include/config/auto.conf
589 # but do not care if they are up-to-date. Use auto.conf to trigger the test
590 PHONY += include/config/auto.conf
591 
592 include/config/auto.conf:
593         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
594         echo >&2;                                                       \
595         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
596         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
597         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
598         echo >&2 ;                                                      \
599         /bin/false)
600 
601 endif # KBUILD_EXTMOD
602 
603 else
604 # Dummy target needed, because used as prerequisite
605 include/config/auto.conf: ;
606 endif # $(dot-config)
607 
608 # The all: target is the default when no target is given on the
609 # command line.
610 # This allow a user to issue only 'make' to build a kernel including modules
611 # Defaults to vmlinux, but the arch makefile usually adds further targets
612 all: vmlinux
613 
614 include $(srctree)/arch/$(SRCARCH)/Makefile
615 
616 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
617 
618 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
619 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
620 else
621 KBUILD_CFLAGS   += -O2
622 endif
623 
624 ifdef CONFIG_READABLE_ASM
625 # Disable optimizations that make assembler listings hard to read.
626 # reorder blocks reorders the control in the function
627 # ipa clone creates specialized cloned functions
628 # partial inlining inlines only parts of functions
629 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
630                  $(call cc-option,-fno-ipa-cp-clone,) \
631                  $(call cc-option,-fno-partial-inlining)
632 endif
633 
634 ifneq ($(CONFIG_FRAME_WARN),0)
635 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
636 endif
637 
638 # Handle stack protector mode.
639 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
640   stackp-flag := -fstack-protector
641   ifeq ($(call cc-option, $(stackp-flag)),)
642     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
643              -fstack-protector not supported by compiler)
644   endif
645 else
646 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
647   stackp-flag := -fstack-protector-strong
648   ifeq ($(call cc-option, $(stackp-flag)),)
649     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
650               -fstack-protector-strong not supported by compiler)
651   endif
652 else
653   # Force off for distro compilers that enable stack protector by default.
654   stackp-flag := $(call cc-option, -fno-stack-protector)
655 endif
656 endif
657 KBUILD_CFLAGS += $(stackp-flag)
658 
659 ifeq ($(COMPILER),clang)
660 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
661 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
662 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
663 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
664 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
665 # Quiet clang warning: comparison of unsigned expression < 0 is always false
666 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
667 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
668 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
669 # See modpost pattern 2
670 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
671 else
672 
673 # This warning generated too much noise in a regular build.
674 # Use make W=1 to enable this warning (see scripts/Makefile.build)
675 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
676 endif
677 
678 ifdef CONFIG_FRAME_POINTER
679 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
680 else
681 # Some targets (ARM with Thumb2, for example), can't be built with frame
682 # pointers.  For those, we don't have FUNCTION_TRACER automatically
683 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
684 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
685 # -fomit-frame-pointer with FUNCTION_TRACER.
686 ifndef CONFIG_FUNCTION_TRACER
687 KBUILD_CFLAGS   += -fomit-frame-pointer
688 endif
689 endif
690 
691 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
692 
693 ifdef CONFIG_DEBUG_INFO
694 KBUILD_CFLAGS   += -g
695 KBUILD_AFLAGS   += -Wa,-gdwarf-2
696 endif
697 
698 ifdef CONFIG_DEBUG_INFO_REDUCED
699 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
700                    $(call cc-option,-fno-var-tracking)
701 endif
702 
703 ifdef CONFIG_FUNCTION_TRACER
704 ifdef CONFIG_HAVE_FENTRY
705 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
706 endif
707 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
708 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
709 ifdef CONFIG_DYNAMIC_FTRACE
710         ifdef CONFIG_HAVE_C_RECORDMCOUNT
711                 BUILD_C_RECORDMCOUNT := y
712                 export BUILD_C_RECORDMCOUNT
713         endif
714 endif
715 endif
716 
717 # We trigger additional mismatches with less inlining
718 ifdef CONFIG_DEBUG_SECTION_MISMATCH
719 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
720 endif
721 
722 # arch Makefile may override CC so keep this after arch Makefile is included
723 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
724 CHECKFLAGS     += $(NOSTDINC_FLAGS)
725 
726 # warn about C99 declaration after statement
727 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
728 
729 # disable pointer signed / unsigned warnings in gcc 4.0
730 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
731 
732 # disable invalid "can't wrap" optimizations for signed / pointers
733 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
734 
735 # conserve stack if available
736 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
737 
738 # disallow errors like 'EXPORT_GPL(foo);' with missing header
739 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
740 
741 # require functions to have arguments in prototypes, not empty 'int foo()'
742 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
743 
744 # Prohibit date/time macros, which would make the build non-deterministic
745 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
746 
747 # use the deterministic mode of AR if available
748 KBUILD_ARFLAGS := $(call ar-option,D)
749 
750 # check for 'asm goto'
751 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
752         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
753 endif
754 
755 include $(srctree)/scripts/Makefile.extrawarn
756 
757 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
758 KBUILD_CPPFLAGS += $(KCPPFLAGS)
759 KBUILD_AFLAGS += $(KAFLAGS)
760 KBUILD_CFLAGS += $(KCFLAGS)
761 
762 # Use --build-id when available.
763 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
764                               $(call cc-ldoption, -Wl$(comma)--build-id,))
765 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
766 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
767 
768 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
769 LDFLAGS_vmlinux += $(call ld-option, -X,)
770 endif
771 
772 # Default kernel image to build when no specific target is given.
773 # KBUILD_IMAGE may be overruled on the command line or
774 # set in the environment
775 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
776 # this default value
777 export KBUILD_IMAGE ?= vmlinux
778 
779 #
780 # INSTALL_PATH specifies where to place the updated kernel and system map
781 # images. Default is /boot, but you can set it to other values
782 export  INSTALL_PATH ?= /boot
783 
784 #
785 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
786 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
787 # an argument if needed. Otherwise it defaults to the kernel install path
788 #
789 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
790 
791 #
792 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
793 # relocations required by build roots.  This is not defined in the
794 # makefile but the argument can be passed to make if needed.
795 #
796 
797 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
798 export MODLIB
799 
800 #
801 # INSTALL_MOD_STRIP, if defined, will cause modules to be
802 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
803 # the default option --strip-debug will be used.  Otherwise,
804 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
805 
806 ifdef INSTALL_MOD_STRIP
807 ifeq ($(INSTALL_MOD_STRIP),1)
808 mod_strip_cmd = $(STRIP) --strip-debug
809 else
810 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
811 endif # INSTALL_MOD_STRIP=1
812 else
813 mod_strip_cmd = true
814 endif # INSTALL_MOD_STRIP
815 export mod_strip_cmd
816 
817 # Select initial ramdisk compression format, default is gzip(1).
818 # This shall be used by the dracut(8) tool while creating an initramfs image.
819 #
820 INITRD_COMPRESS-y                  := gzip
821 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
822 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
823 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
824 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
825 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
826 # do not export INITRD_COMPRESS, since we didn't actually
827 # choose a sane default compression above.
828 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
829 
830 ifdef CONFIG_MODULE_SIG_ALL
831 MODSECKEY = ./signing_key.priv
832 MODPUBKEY = ./signing_key.x509
833 export MODPUBKEY
834 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
835 else
836 mod_sign_cmd = true
837 endif
838 export mod_sign_cmd
839 
840 
841 ifeq ($(KBUILD_EXTMOD),)
842 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
843 
844 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
845                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
846                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
847 
848 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
849                      $(init-n) $(init-) \
850                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
851                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
852 
853 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
854 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
855 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
856 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
857 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
858 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
859 libs-y          := $(libs-y1) $(libs-y2)
860 
861 # Externally visible symbols (used by link-vmlinux.sh)
862 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
863 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
864 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
865 export LDFLAGS_vmlinux
866 # used by scripts/pacmage/Makefile
867 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
868 
869 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
870 
871 # Final link of vmlinux
872       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
873 quiet_cmd_link-vmlinux = LINK    $@
874 
875 # Include targets which we want to
876 # execute if the rest of the kernel build went well.
877 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
878 ifdef CONFIG_HEADERS_CHECK
879         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
880 endif
881 ifdef CONFIG_SAMPLES
882         $(Q)$(MAKE) $(build)=samples
883 endif
884 ifdef CONFIG_BUILD_DOCSRC
885         $(Q)$(MAKE) $(build)=Documentation
886 endif
887         +$(call if_changed,link-vmlinux)
888 
889 # The actual objects are generated when descending,
890 # make sure no implicit rule kicks in
891 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
892 
893 # Handle descending into subdirectories listed in $(vmlinux-dirs)
894 # Preset locale variables to speed up the build process. Limit locale
895 # tweaks to this spot to avoid wrong language settings when running
896 # make menuconfig etc.
897 # Error messages still appears in the original language
898 
899 PHONY += $(vmlinux-dirs)
900 $(vmlinux-dirs): prepare scripts
901         $(Q)$(MAKE) $(build)=$@
902 
903 define filechk_kernel.release
904         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
905 endef
906 
907 # Store (new) KERNELRELEASE string in include/config/kernel.release
908 include/config/kernel.release: include/config/auto.conf FORCE
909         $(call filechk,kernel.release)
910 
911 
912 # Things we need to do before we recursively start building the kernel
913 # or the modules are listed in "prepare".
914 # A multi level approach is used. prepareN is processed before prepareN-1.
915 # archprepare is used in arch Makefiles and when processed asm symlink,
916 # version.h and scripts_basic is processed / created.
917 
918 # Listed in dependency order
919 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
920 
921 # prepare3 is used to check if we are building in a separate output directory,
922 # and if so do:
923 # 1) Check that make has not been executed in the kernel src $(srctree)
924 prepare3: include/config/kernel.release
925 ifneq ($(KBUILD_SRC),)
926         @$(kecho) '  Using $(srctree) as source for kernel'
927         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
928                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
929                 echo >&2 "  in the '$(srctree)' directory.";\
930                 /bin/false; \
931         fi;
932 endif
933 
934 # prepare2 creates a makefile if using a separate output directory
935 prepare2: prepare3 outputmakefile asm-generic
936 
937 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
938                    include/config/auto.conf
939         $(cmd_crmodverdir)
940 
941 archprepare: archheaders archscripts prepare1 scripts_basic
942 
943 prepare0: archprepare FORCE
944         $(Q)$(MAKE) $(build)=.
945 
946 # All the preparing..
947 prepare: prepare0
948 
949 # Generate some files
950 # ---------------------------------------------------------------------------
951 
952 # KERNELRELEASE can change from a few different places, meaning version.h
953 # needs to be updated, so this check is forced on all builds
954 
955 uts_len := 64
956 define filechk_utsrelease.h
957         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
958           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
959           exit 1;                                                         \
960         fi;                                                               \
961         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
962 endef
963 
964 define filechk_version.h
965         (echo \#define LINUX_VERSION_CODE $(shell                         \
966         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
967         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
968 endef
969 
970 $(version_h): $(srctree)/Makefile FORCE
971         $(call filechk,version.h)
972 
973 include/generated/utsrelease.h: include/config/kernel.release FORCE
974         $(call filechk,utsrelease.h)
975 
976 PHONY += headerdep
977 headerdep:
978         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
979         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
980 
981 # ---------------------------------------------------------------------------
982 
983 PHONY += depend dep
984 depend dep:
985         @echo '*** Warning: make $@ is unnecessary now.'
986 
987 # ---------------------------------------------------------------------------
988 # Firmware install
989 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
990 export INSTALL_FW_PATH
991 
992 PHONY += firmware_install
993 firmware_install: FORCE
994         @mkdir -p $(objtree)/firmware
995         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
996 
997 # ---------------------------------------------------------------------------
998 # Kernel headers
999 
1000 #Default location for installed headers
1001 export INSTALL_HDR_PATH = $(objtree)/usr
1002 
1003 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1004 
1005 # If we do an all arch process set dst to asm-$(hdr-arch)
1006 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1007 
1008 PHONY += archheaders
1009 archheaders:
1010 
1011 PHONY += archscripts
1012 archscripts:
1013 
1014 PHONY += __headers
1015 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1016         $(Q)$(MAKE) $(build)=scripts build_unifdef
1017 
1018 PHONY += headers_install_all
1019 headers_install_all:
1020         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1021 
1022 PHONY += headers_install
1023 headers_install: __headers
1024         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1025           $(error Headers not exportable for the $(SRCARCH) architecture))
1026         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1027         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1028 
1029 PHONY += headers_check_all
1030 headers_check_all: headers_install_all
1031         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1032 
1033 PHONY += headers_check
1034 headers_check: headers_install
1035         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1036         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1037 
1038 # ---------------------------------------------------------------------------
1039 # Modules
1040 
1041 ifdef CONFIG_MODULES
1042 
1043 # By default, build modules as well
1044 
1045 all: modules
1046 
1047 # Build modules
1048 #
1049 # A module can be listed more than once in obj-m resulting in
1050 # duplicate lines in modules.order files.  Those are removed
1051 # using awk while concatenating to the final file.
1052 
1053 PHONY += modules
1054 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1055         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1056         @$(kecho) '  Building modules, stage 2.';
1057         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1058         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1059 
1060 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1061         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1062 
1063 %/modules.builtin: include/config/auto.conf
1064         $(Q)$(MAKE) $(modbuiltin)=$*
1065 
1066 
1067 # Target to prepare building external modules
1068 PHONY += modules_prepare
1069 modules_prepare: prepare scripts
1070 
1071 # Target to install modules
1072 PHONY += modules_install
1073 modules_install: _modinst_ _modinst_post
1074 
1075 PHONY += _modinst_
1076 _modinst_:
1077         @rm -rf $(MODLIB)/kernel
1078         @rm -f $(MODLIB)/source
1079         @mkdir -p $(MODLIB)/kernel
1080         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1081         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1082                 rm -f $(MODLIB)/build ; \
1083                 ln -s $(CURDIR) $(MODLIB)/build ; \
1084         fi
1085         @cp -f $(objtree)/modules.order $(MODLIB)/
1086         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1087         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1088 
1089 # This depmod is only for convenience to give the initial
1090 # boot a modules.dep even before / is mounted read-write.  However the
1091 # boot script depmod is the master version.
1092 PHONY += _modinst_post
1093 _modinst_post: _modinst_
1094         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1095         $(call cmd,depmod)
1096 
1097 ifeq ($(CONFIG_MODULE_SIG), y)
1098 PHONY += modules_sign
1099 modules_sign:
1100         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1101 endif
1102 
1103 else # CONFIG_MODULES
1104 
1105 # Modules not configured
1106 # ---------------------------------------------------------------------------
1107 
1108 modules modules_install: FORCE
1109         @echo >&2
1110         @echo >&2 "The present kernel configuration has modules disabled."
1111         @echo >&2 "Type 'make config' and enable loadable module support."
1112         @echo >&2 "Then build a kernel with module support enabled."
1113         @echo >&2
1114         @exit 1
1115 
1116 endif # CONFIG_MODULES
1117 
1118 ###
1119 # Cleaning is done on three levels.
1120 # make clean     Delete most generated files
1121 #                Leave enough to build external modules
1122 # make mrproper  Delete the current configuration, and all generated files
1123 # make distclean Remove editor backup files, patch leftover files and the like
1124 
1125 # Directories & files removed with 'make clean'
1126 CLEAN_DIRS  += $(MODVERDIR)
1127 
1128 # Directories & files removed with 'make mrproper'
1129 MRPROPER_DIRS  += include/config usr/include include/generated          \
1130                   arch/*/include/generated .tmp_objdiff
1131 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1132                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1133                   signing_key.priv signing_key.x509 x509.genkey         \
1134                   extra_certificates signing_key.x509.keyid             \
1135                   signing_key.x509.signer include/linux/version.h
1136 
1137 # clean - Delete most, but leave enough to build external modules
1138 #
1139 clean: rm-dirs  := $(CLEAN_DIRS)
1140 clean: rm-files := $(CLEAN_FILES)
1141 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1142 
1143 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1144 $(clean-dirs):
1145         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1146 
1147 vmlinuxclean:
1148         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1149 
1150 clean: archclean vmlinuxclean
1151 
1152 # mrproper - Delete all generated files, including .config
1153 #
1154 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1155 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1156 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1157 
1158 PHONY += $(mrproper-dirs) mrproper archmrproper
1159 $(mrproper-dirs):
1160         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1161 
1162 mrproper: clean archmrproper $(mrproper-dirs)
1163         $(call cmd,rmdirs)
1164         $(call cmd,rmfiles)
1165 
1166 # distclean
1167 #
1168 PHONY += distclean
1169 
1170 distclean: mrproper
1171         @find $(srctree) $(RCS_FIND_IGNORE) \
1172                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1173                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1174                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1175                 -type f -print | xargs rm -f
1176 
1177 
1178 # Packaging of the kernel to various formats
1179 # ---------------------------------------------------------------------------
1180 # rpm target kept for backward compatibility
1181 package-dir     := scripts/package
1182 
1183 %src-pkg: FORCE
1184         $(Q)$(MAKE) $(build)=$(package-dir) $@
1185 %pkg: include/config/kernel.release FORCE
1186         $(Q)$(MAKE) $(build)=$(package-dir) $@
1187 rpm: include/config/kernel.release FORCE
1188         $(Q)$(MAKE) $(build)=$(package-dir) $@
1189 
1190 
1191 # Brief documentation of the typical targets used
1192 # ---------------------------------------------------------------------------
1193 
1194 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1195 boards := $(notdir $(boards))
1196 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1197 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1198 
1199 help:
1200         @echo  'Cleaning targets:'
1201         @echo  '  clean           - Remove most generated files but keep the config and'
1202         @echo  '                    enough build support to build external modules'
1203         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1204         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1205         @echo  ''
1206         @echo  'Configuration targets:'
1207         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208         @echo  ''
1209         @echo  'Other generic targets:'
1210         @echo  '  all             - Build all targets marked with [*]'
1211         @echo  '* vmlinux         - Build the bare kernel'
1212         @echo  '* modules         - Build all modules'
1213         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1214         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1215         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1216         @echo  '  dir/            - Build all files in dir and below'
1217         @echo  '  dir/file.[oisS] - Build specified target only'
1218         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1219         @echo  '                    (requires a recent binutils and recent build (System.map))'
1220         @echo  '  dir/file.ko     - Build module including final link'
1221         @echo  '  modules_prepare - Set up for building external modules'
1222         @echo  '  tags/TAGS       - Generate tags file for editors'
1223         @echo  '  cscope          - Generate cscope index'
1224         @echo  '  gtags           - Generate GNU GLOBAL index'
1225         @echo  '  kernelrelease   - Output the release version string'
1226         @echo  '  kernelversion   - Output the version stored in Makefile'
1227         @echo  '  image_name      - Output the image name'
1228         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1229          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1230          echo  ''
1231         @echo  'Static analysers'
1232         @echo  '  checkstack      - Generate a list of stack hogs'
1233         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1234         @echo  '  versioncheck    - Sanity check on version.h usage'
1235         @echo  '  includecheck    - Check for duplicate included header files'
1236         @echo  '  export_report   - List the usages of all exported symbols'
1237         @echo  '  headers_check   - Sanity check on exported headers'
1238         @echo  '  headerdep       - Detect inclusion cycles in headers'
1239         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1240         @echo  ''
1241         @echo  'Kernel packaging:'
1242         @$(MAKE) $(build)=$(package-dir) help
1243         @echo  ''
1244         @echo  'Documentation targets:'
1245         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1246         @echo  ''
1247         @echo  'Architecture specific targets ($(SRCARCH)):'
1248         @$(if $(archhelp),$(archhelp),\
1249                 echo '  No architecture specific help defined for $(SRCARCH)')
1250         @echo  ''
1251         @$(if $(boards), \
1252                 $(foreach b, $(boards), \
1253                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1254                 echo '')
1255         @$(if $(board-dirs), \
1256                 $(foreach b, $(board-dirs), \
1257                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1258                 printf "  %-16s - Show all of the above\\n" help-boards; \
1259                 echo '')
1260 
1261         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1262         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1263         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1264         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1265         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1266         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1267         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1268         @echo  '                1: warnings which may be relevant and do not occur too often'
1269         @echo  '                2: warnings which occur quite often but may still be relevant'
1270         @echo  '                3: more obscure warnings, can most likely be ignored'
1271         @echo  '                Multiple levels can be combined with W=12 or W=123'
1272         @echo  ''
1273         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1274         @echo  'For further info see the ./README file'
1275 
1276 
1277 help-board-dirs := $(addprefix help-,$(board-dirs))
1278 
1279 help-boards: $(help-board-dirs)
1280 
1281 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1282 
1283 $(help-board-dirs): help-%:
1284         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1285         @$(if $(boards-per-dir), \
1286                 $(foreach b, $(boards-per-dir), \
1287                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1288                 echo '')
1289 
1290 
1291 # Documentation targets
1292 # ---------------------------------------------------------------------------
1293 %docs: scripts_basic FORCE
1294         $(Q)$(MAKE) $(build)=scripts build_docproc
1295         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1296 
1297 else # KBUILD_EXTMOD
1298 
1299 ###
1300 # External module support.
1301 # When building external modules the kernel used as basis is considered
1302 # read-only, and no consistency checks are made and the make
1303 # system is not used on the basis kernel. If updates are required
1304 # in the basis kernel ordinary make commands (without M=...) must
1305 # be used.
1306 #
1307 # The following are the only valid targets when building external
1308 # modules.
1309 # make M=dir clean     Delete all automatically generated files
1310 # make M=dir modules   Make all modules in specified dir
1311 # make M=dir           Same as 'make M=dir modules'
1312 # make M=dir modules_install
1313 #                      Install the modules built in the module directory
1314 #                      Assumes install directory is already created
1315 
1316 # We are always building modules
1317 KBUILD_MODULES := 1
1318 PHONY += crmodverdir
1319 crmodverdir:
1320         $(cmd_crmodverdir)
1321 
1322 PHONY += $(objtree)/Module.symvers
1323 $(objtree)/Module.symvers:
1324         @test -e $(objtree)/Module.symvers || ( \
1325         echo; \
1326         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1327         echo "           is missing; modules will have no dependencies and modversions."; \
1328         echo )
1329 
1330 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1331 PHONY += $(module-dirs) modules
1332 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1333         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1334 
1335 modules: $(module-dirs)
1336         @$(kecho) '  Building modules, stage 2.';
1337         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1338 
1339 PHONY += modules_install
1340 modules_install: _emodinst_ _emodinst_post
1341 
1342 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1343 PHONY += _emodinst_
1344 _emodinst_:
1345         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1346         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1347 
1348 PHONY += _emodinst_post
1349 _emodinst_post: _emodinst_
1350         $(call cmd,depmod)
1351 
1352 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1353 
1354 PHONY += $(clean-dirs) clean
1355 $(clean-dirs):
1356         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1357 
1358 clean:  rm-dirs := $(MODVERDIR)
1359 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1360 
1361 help:
1362         @echo  '  Building external modules.'
1363         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1364         @echo  ''
1365         @echo  '  modules         - default target, build the module(s)'
1366         @echo  '  modules_install - install the module'
1367         @echo  '  clean           - remove generated files in module directory only'
1368         @echo  ''
1369 
1370 # Dummies...
1371 PHONY += prepare scripts
1372 prepare: ;
1373 scripts: ;
1374 endif # KBUILD_EXTMOD
1375 
1376 clean: $(clean-dirs)
1377         $(call cmd,rmdirs)
1378         $(call cmd,rmfiles)
1379         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1380                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1381                 -o -name '*.ko.*' \
1382                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1383                 -o -name '*.symtypes' -o -name 'modules.order' \
1384                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1385                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1386 
1387 # Generate tags for editors
1388 # ---------------------------------------------------------------------------
1389 quiet_cmd_tags = GEN     $@
1390       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1391 
1392 tags TAGS cscope gtags: FORCE
1393         $(call cmd,tags)
1394 
1395 # Scripts to check various things for consistency
1396 # ---------------------------------------------------------------------------
1397 
1398 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1399 
1400 includecheck:
1401         find $(srctree)/* $(RCS_FIND_IGNORE) \
1402                 -name '*.[hcS]' -type f -print | sort \
1403                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1404 
1405 versioncheck:
1406         find $(srctree)/* $(RCS_FIND_IGNORE) \
1407                 -name '*.[hcS]' -type f -print | sort \
1408                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1409 
1410 coccicheck:
1411         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1412 
1413 namespacecheck:
1414         $(PERL) $(srctree)/scripts/namespace.pl
1415 
1416 export_report:
1417         $(PERL) $(srctree)/scripts/export_report.pl
1418 
1419 endif #ifeq ($(config-targets),1)
1420 endif #ifeq ($(mixed-targets),1)
1421 
1422 PHONY += checkstack kernelrelease kernelversion image_name
1423 
1424 # UML needs a little special treatment here.  It wants to use the host
1425 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1426 # else wants $(ARCH), including people doing cross-builds, which means
1427 # that $(SUBARCH) doesn't work here.
1428 ifeq ($(ARCH), um)
1429 CHECKSTACK_ARCH := $(SUBARCH)
1430 else
1431 CHECKSTACK_ARCH := $(ARCH)
1432 endif
1433 checkstack:
1434         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1435         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1436 
1437 kernelrelease:
1438         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1439 
1440 kernelversion:
1441         @echo $(KERNELVERSION)
1442 
1443 image_name:
1444         @echo $(KBUILD_IMAGE)
1445 
1446 # Clear a bunch of variables before executing the submake
1447 tools/: FORCE
1448         $(Q)mkdir -p $(objtree)/tools
1449         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1450 
1451 tools/%: FORCE
1452         $(Q)mkdir -p $(objtree)/tools
1453         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1454 
1455 # Single targets
1456 # ---------------------------------------------------------------------------
1457 # Single targets are compatible with:
1458 # - build with mixed source and output
1459 # - build with separate output dir 'make O=...'
1460 # - external modules
1461 #
1462 #  target-dir => where to store outputfile
1463 #  build-dir  => directory in kernel source tree to use
1464 
1465 ifeq ($(KBUILD_EXTMOD),)
1466         build-dir  = $(patsubst %/,%,$(dir $@))
1467         target-dir = $(dir $@)
1468 else
1469         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1470         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1471         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1472 endif
1473 
1474 %.s: %.c prepare scripts FORCE
1475         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476 %.i: %.c prepare scripts FORCE
1477         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478 %.o: %.c prepare scripts FORCE
1479         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 %.lst: %.c prepare scripts FORCE
1481         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482 %.s: %.S prepare scripts FORCE
1483         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484 %.o: %.S prepare scripts FORCE
1485         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1486 %.symtypes: %.c prepare scripts FORCE
1487         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488 
1489 # Modules
1490 /: prepare scripts FORCE
1491         $(cmd_crmodverdir)
1492         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1493         $(build)=$(build-dir)
1494 %/: prepare scripts FORCE
1495         $(cmd_crmodverdir)
1496         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1497         $(build)=$(build-dir)
1498 %.ko: prepare scripts FORCE
1499         $(cmd_crmodverdir)
1500         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1501         $(build)=$(build-dir) $(@:.ko=.o)
1502         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1503 
1504 # FIXME Should go into a make.lib or something
1505 # ===========================================================================
1506 
1507 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1508       cmd_rmdirs = rm -rf $(rm-dirs)
1509 
1510 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1511       cmd_rmfiles = rm -f $(rm-files)
1512 
1513 # Run depmod only if we have System.map and depmod is executable
1514 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1515       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1516                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1517 
1518 # Create temporary dir for module support files
1519 # clean it up only when building all modules
1520 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1521                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1522 
1523 # read all saved command lines
1524 
1525 targets := $(wildcard $(sort $(targets)))
1526 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1527 
1528 ifneq ($(cmd_files),)
1529   $(cmd_files): ;       # Do not try to update included dependency files
1530   include $(cmd_files)
1531 endif
1532 
1533 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1534 # Usage:
1535 # $(Q)$(MAKE) $(clean)=dir
1536 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1537 
1538 endif   # skip-makefile
1539 
1540 PHONY += FORCE
1541 FORCE:
1542 
1543 # Declare the contents of the .PHONY variable as phony.  We keep that
1544 # information in a variable so we can use it in if_changed and friends.
1545 .PHONY: $(PHONY)

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