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

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