linux-5.3.0/Makefile

1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 5
3 PATCHLEVEL = 3
4 SUBLEVEL = 0
5 EXTRAVERSION =
6 NAME = Bobtail Squid
7 
8 # *DOCUMENTATION*
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
13 
14 # That's our default target when none is given on the command line
15 PHONY := _all
16 _all:
17 
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
20 #
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
27 # is now up to date.
28 #
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
32 # prepare rule.
33 
34 ifneq ($(sub_make_done),1)
35 
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
38 MAKEFLAGS += -rR
39 
40 # Avoid funny character set dependencies
41 unexport LC_ALL
42 LC_COLLATE=C
43 LC_NUMERIC=C
44 export LC_COLLATE LC_NUMERIC
45 
46 # Avoid interference with shell env settings
47 unexport GREP_OPTIONS
48 
49 # Beautify output
50 # ---------------------------------------------------------------------------
51 #
52 # Normally, we echo the whole command before executing it. By making
53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
54 # $(quiet) to choose other forms of output instead, e.g.
55 #
56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
58 #
59 # If $(quiet) is empty, the whole command will be printed.
60 # If it is set to "quiet_", only the short version will be printed.
61 # If it is set to "silent_", nothing will be printed at all, since
62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 #
64 # A simple variant is to prefix commands with $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
66 #
67 #	$(Q)ln $@ :<
68 #
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 #
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
74 
75 ifeq ("$(origin V)", "command line")
76   KBUILD_VERBOSE = $(V)
77 endif
78 ifndef KBUILD_VERBOSE
79   KBUILD_VERBOSE = 0
80 endif
81 
82 ifeq ($(KBUILD_VERBOSE),1)
83   quiet =
84   Q =
85 else
86   quiet=quiet_
87   Q = @
88 endif
89 
90 # If the user is running make -s (silent mode), suppress echoing of
91 # commands
92 
93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
94   quiet=silent_
95 endif
96 
97 export quiet Q KBUILD_VERBOSE
98 
99 # Kbuild will save output files in the current working directory.
100 # This does not need to match to the root of the kernel source tree.
101 #
102 # For example, you can do this:
103 #
104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
105 #
106 # If you want to save output files in a different location, there are
107 # two syntaxes to specify it.
108 #
109 # 1) O=
110 # Use "make O=dir/to/store/output/files/"
111 #
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
115 #
116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
117 # variable.
118 
119 # Do we want to change the working directory?
120 ifeq ("$(origin O)", "command line")
121   KBUILD_OUTPUT := $(O)
122 endif
123 
124 ifneq ($(KBUILD_OUTPUT),)
125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126 # expand a shell special character '~'. We use a somewhat tedious way here.
127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128 $(if $(abs_objtree),, \
129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
130 
131 # $(realpath ...) resolves symlinks
132 abs_objtree := $(realpath $(abs_objtree))
133 else
134 abs_objtree := $(CURDIR)
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 
137 ifeq ($(abs_objtree),$(CURDIR))
138 # Suppress "Entering directory ..." unless we are changing the work directory.
139 MAKEFLAGS += --no-print-directory
140 else
141 need-sub-make := 1
142 endif
143 
144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
145 
146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147 $(error source directory cannot contain spaces or colons)
148 endif
149 
150 ifneq ($(abs_srctree),$(abs_objtree))
151 # Look for make include files relative to root of kernel src
152 #
153 # This does not become effective immediately because MAKEFLAGS is re-parsed
154 # once after the Makefile is read. We need to invoke sub-make.
155 MAKEFLAGS += --include-dir=$(abs_srctree)
156 need-sub-make := 1
157 endif
158 
159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
162 need-sub-make := 1
163 # Cancel implicit rules for this Makefile.
164 $(lastword $(MAKEFILE_LIST)): ;
165 endif
166 
167 export abs_srctree abs_objtree
168 export sub_make_done := 1
169 
170 ifeq ($(need-sub-make),1)
171 
172 PHONY += $(MAKECMDGOALS) sub-make
173 
174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
175 	@:
176 
177 # Invoke a second make in the output directory, passing relevant variables
178 sub-make:
179 	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
180 
181 endif # need-sub-make
182 endif # sub_make_done
183 
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(need-sub-make),)
186 
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS += --no-print-directory
191 
192 # Call a source code checker (by default, "sparse") as part of the
193 # C compilation.
194 #
195 # Use 'make C=1' to enable checking of only re-compiled files.
196 # Use 'make C=2' to enable checking of *all* source files, regardless
197 # of whether they are re-compiled or not.
198 #
199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
200 # including where to get the "sparse" utility.
201 
202 ifeq ("$(origin C)", "command line")
203   KBUILD_CHECKSRC = $(C)
204 endif
205 ifndef KBUILD_CHECKSRC
206   KBUILD_CHECKSRC = 0
207 endif
208 
209 # Use make M=dir to specify directory of external module to build
210 # Old syntax make ... SUBDIRS=$PWD is still supported
211 # Setting the environment variable KBUILD_EXTMOD take precedence
212 ifdef SUBDIRS
213   $(warning ================= WARNING ================)
214   $(warning 'SUBDIRS' will be removed after Linux 5.3)
215   $(warning )
216   $(warning If you are building an individual subdirectory)
217   $(warning in the kernel tree, you can do like this:)
218   $(warning $$ make path/to/dir/you/want/to/build/)
219   $(warning (Do not forget the trailing slash))
220   $(warning )
221   $(warning If you are building an external module,)
222   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
223   $(warning ==========================================)
224   KBUILD_EXTMOD ?= $(SUBDIRS)
225 endif
226 
227 ifeq ("$(origin M)", "command line")
228   KBUILD_EXTMOD := $(M)
229 endif
230 
231 export KBUILD_CHECKSRC KBUILD_EXTMOD
232 
233 ifeq ($(abs_srctree),$(abs_objtree))
234         # building in the source tree
235         srctree := .
236 	building_out_of_srctree :=
237 else
238         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
239                 # building in a subdirectory of the source tree
240                 srctree := ..
241         else
242                 srctree := $(abs_srctree)
243         endif
244 	building_out_of_srctree := 1
245 endif
246 
247 ifneq ($(KBUILD_ABS_SRCTREE),)
248 srctree := $(abs_srctree)
249 endif
250 
251 objtree		:= .
252 VPATH		:= $(srctree)
253 
254 export building_out_of_srctree srctree objtree VPATH
255 
256 # To make sure we do not include .config for any of the *config targets
257 # catch them early, and hand them over to scripts/kconfig/Makefile
258 # It is allowed to specify more targets when calling make, including
259 # mixing *config targets and build targets.
260 # For example 'make oldconfig all'.
261 # Detect when mixed targets is specified, and make a second invocation
262 # of make so .config is not included in this case either (for *config).
263 
264 version_h := include/generated/uapi/linux/version.h
265 old_version_h := include/linux/version.h
266 
267 clean-targets := %clean mrproper cleandocs
268 no-dot-config-targets := $(clean-targets) \
269 			 cscope gtags TAGS tags help% %docs check% coccicheck \
270 			 $(version_h) headers headers_% archheaders archscripts \
271 			 %asm-generic kernelversion %src-pkg
272 no-sync-config-targets := $(no-dot-config-targets) install %install \
273 			   kernelrelease
274 
275 config-targets  := 0
276 mixed-targets   := 0
277 dot-config      := 1
278 may-sync-config := 1
279 
280 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
281 	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
282 		dot-config := 0
283 	endif
284 endif
285 
286 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
287 	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
288 		may-sync-config := 0
289 	endif
290 endif
291 
292 ifneq ($(KBUILD_EXTMOD),)
293 	may-sync-config := 0
294 endif
295 
296 ifeq ($(KBUILD_EXTMOD),)
297         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
298                 config-targets := 1
299                 ifneq ($(words $(MAKECMDGOALS)),1)
300                         mixed-targets := 1
301                 endif
302         endif
303 endif
304 
305 # For "make -j clean all", "make -j mrproper defconfig all", etc.
306 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
307         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
308                 mixed-targets := 1
309         endif
310 endif
311 
312 # install and modules_install need also be processed one by one
313 ifneq ($(filter install,$(MAKECMDGOALS)),)
314         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
315 	        mixed-targets := 1
316         endif
317 endif
318 
319 ifeq ($(mixed-targets),1)
320 # ===========================================================================
321 # We're called with mixed targets (*config and build targets).
322 # Handle them one by one.
323 
324 PHONY += $(MAKECMDGOALS) __build_one_by_one
325 
326 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
327 	@:
328 
329 __build_one_by_one:
330 	$(Q)set -e; \
331 	for i in $(MAKECMDGOALS); do \
332 		$(MAKE) -f $(srctree)/Makefile $$i; \
333 	done
334 
335 else
336 
337 include scripts/Kbuild.include
338 
339 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
340 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
341 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
342 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343 
344 include scripts/subarch.include
345 
346 # Cross compiling and selecting different set of gcc/bin-utils
347 # ---------------------------------------------------------------------------
348 #
349 # When performing cross compilation for other architectures ARCH shall be set
350 # to the target architecture. (See arch/* for the possibilities).
351 # ARCH can be set during invocation of make:
352 # make ARCH=ia64
353 # Another way is to have ARCH set in the environment.
354 # The default ARCH is the host where make is executed.
355 
356 # CROSS_COMPILE specify the prefix used for all executables used
357 # during compilation. Only gcc and related bin-utils executables
358 # are prefixed with $(CROSS_COMPILE).
359 # CROSS_COMPILE can be set on the command line
360 # make CROSS_COMPILE=ia64-linux-
361 # Alternatively CROSS_COMPILE can be set in the environment.
362 # Default value for CROSS_COMPILE is not to prefix executables
363 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
364 ARCH		?= $(SUBARCH)
365 
366 # Architecture as present in compile.h
367 UTS_MACHINE 	:= $(ARCH)
368 SRCARCH 	:= $(ARCH)
369 
370 # Additional ARCH settings for x86
371 ifeq ($(ARCH),i386)
372         SRCARCH := x86
373 endif
374 ifeq ($(ARCH),x86_64)
375         SRCARCH := x86
376 endif
377 
378 # Additional ARCH settings for sparc
379 ifeq ($(ARCH),sparc32)
380        SRCARCH := sparc
381 endif
382 ifeq ($(ARCH),sparc64)
383        SRCARCH := sparc
384 endif
385 
386 # Additional ARCH settings for sh
387 ifeq ($(ARCH),sh64)
388        SRCARCH := sh
389 endif
390 
391 KCONFIG_CONFIG	?= .config
392 export KCONFIG_CONFIG
393 
394 # SHELL used by kbuild
395 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
396 	  else if [ -x /bin/bash ]; then echo /bin/bash; \
397 	  else echo sh; fi ; fi)
398 
399 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
400 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
401 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
402 
403 HOSTCC       = gcc
404 HOSTCXX      = g++
405 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
406 		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
407 		$(HOSTCFLAGS)
408 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
409 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
410 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
411 
412 # Make variables (CC, etc...)
413 AS		= $(CROSS_COMPILE)as
414 LD		= $(CROSS_COMPILE)ld
415 CC		= $(CROSS_COMPILE)gcc
416 CPP		= $(CC) -E
417 AR		= $(CROSS_COMPILE)ar
418 NM		= $(CROSS_COMPILE)nm
419 STRIP		= $(CROSS_COMPILE)strip
420 OBJCOPY		= $(CROSS_COMPILE)objcopy
421 OBJDUMP		= $(CROSS_COMPILE)objdump
422 OBJSIZE		= $(CROSS_COMPILE)size
423 PAHOLE		= pahole
424 LEX		= flex
425 YACC		= bison
426 AWK		= awk
427 INSTALLKERNEL  := installkernel
428 DEPMOD		= /sbin/depmod
429 PERL		= perl
430 PYTHON		= python
431 PYTHON2		= python2
432 PYTHON3		= python3
433 CHECK		= sparse
434 
435 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
436 		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
437 NOSTDINC_FLAGS :=
438 CFLAGS_MODULE   =
439 AFLAGS_MODULE   =
440 LDFLAGS_MODULE  =
441 CFLAGS_KERNEL	=
442 AFLAGS_KERNEL	=
443 LDFLAGS_vmlinux =
444 
445 # Use USERINCLUDE when you must reference the UAPI directories only.
446 USERINCLUDE    := \
447 		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
448 		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
449 		-I$(srctree)/include/uapi \
450 		-I$(objtree)/include/generated/uapi \
451                 -include $(srctree)/include/linux/kconfig.h
452 
453 # Use LINUXINCLUDE when you must reference the include/ directory.
454 # Needed to be compatible with the O= option
455 LINUXINCLUDE    := \
456 		-I$(srctree)/arch/$(SRCARCH)/include \
457 		-I$(objtree)/arch/$(SRCARCH)/include/generated \
458 		$(if $(building_out_of_srctree),-I$(srctree)/include) \
459 		-I$(objtree)/include \
460 		$(USERINCLUDE)
461 
462 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
463 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
464 		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
465 		   -Werror=implicit-function-declaration -Werror=implicit-int \
466 		   -Wno-format-security \
467 		   -std=gnu89
468 KBUILD_CPPFLAGS := -D__KERNEL__
469 KBUILD_AFLAGS_KERNEL :=
470 KBUILD_CFLAGS_KERNEL :=
471 KBUILD_AFLAGS_MODULE  := -DMODULE
472 KBUILD_CFLAGS_MODULE  := -DMODULE
473 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
474 KBUILD_LDFLAGS :=
475 GCC_PLUGINS_CFLAGS :=
476 CLANG_FLAGS :=
477 
478 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
479 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
480 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
481 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
482 
483 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
484 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
485 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
486 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
487 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
488 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
489 export KBUILD_ARFLAGS
490 
491 # Files to ignore in find ... statements
492 
493 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
494 			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
495 			  -prune -o
496 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
497 			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
498 
499 # ===========================================================================
500 # Rules shared between *config targets and build targets
501 
502 # Basic helpers built in scripts/basic/
503 PHONY += scripts_basic
504 scripts_basic:
505 	$(Q)$(MAKE) $(build)=scripts/basic
506 	$(Q)rm -f .tmp_quiet_recordmcount
507 
508 PHONY += outputmakefile
509 # outputmakefile generates a Makefile in the output directory, if using a
510 # separate output directory. This allows convenient use of make in the
511 # output directory.
512 # At the same time when output Makefile generated, generate .gitignore to
513 # ignore whole output directory
514 outputmakefile:
515 ifdef building_out_of_srctree
516 	$(Q)ln -fsn $(srctree) source
517 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
518 	$(Q)test -e .gitignore || \
519 	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
520 endif
521 
522 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
523 ifneq ($(CROSS_COMPILE),)
524 CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
525 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
526 CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
527 GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
528 endif
529 ifneq ($(GCC_TOOLCHAIN),)
530 CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
531 endif
532 ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
533 CLANG_FLAGS	+= -no-integrated-as
534 endif
535 CLANG_FLAGS	+= -Werror=unknown-warning-option
536 KBUILD_CFLAGS	+= $(CLANG_FLAGS)
537 KBUILD_AFLAGS	+= $(CLANG_FLAGS)
538 export CLANG_FLAGS
539 endif
540 
541 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
542 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
543 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
544 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
545 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
546 
547 ifeq ($(config-targets),1)
548 # ===========================================================================
549 # *config targets only - make sure prerequisites are updated, and descend
550 # in scripts/kconfig to make the *config target
551 
552 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
553 # KBUILD_DEFCONFIG may point out an alternative default configuration
554 # used for 'make defconfig'
555 include arch/$(SRCARCH)/Makefile
556 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
557 
558 config: scripts_basic outputmakefile FORCE
559 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
560 
561 %config: scripts_basic outputmakefile FORCE
562 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
563 
564 else
565 # ===========================================================================
566 # Build targets only - this includes vmlinux, arch specific targets, clean
567 # targets and others. In general all targets except *config targets.
568 
569 # If building an external module we do not care about the all: rule
570 # but instead _all depend on modules
571 PHONY += all
572 ifeq ($(KBUILD_EXTMOD),)
573 _all: all
574 else
575 _all: modules
576 endif
577 
578 # Decide whether to build built-in, modular, or both.
579 # Normally, just do built-in.
580 
581 KBUILD_MODULES :=
582 KBUILD_BUILTIN := 1
583 
584 # If we have only "make modules", don't compile built-in objects.
585 # When we're building modules with modversions, we need to consider
586 # the built-in objects during the descend as well, in order to
587 # make sure the checksums are up to date before we record them.
588 
589 ifeq ($(MAKECMDGOALS),modules)
590   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
591 endif
592 
593 # If we have "make <whatever> modules", compile modules
594 # in addition to whatever we do anyway.
595 # Just "make" or "make all" shall build modules as well
596 
597 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
598   KBUILD_MODULES := 1
599 endif
600 
601 ifeq ($(MAKECMDGOALS),)
602   KBUILD_MODULES := 1
603 endif
604 
605 export KBUILD_MODULES KBUILD_BUILTIN
606 
607 ifeq ($(dot-config),1)
608 include include/config/auto.conf
609 endif
610 
611 ifeq ($(KBUILD_EXTMOD),)
612 # Objects we will link into vmlinux / subdirs we need to visit
613 init-y		:= init/
614 drivers-y	:= drivers/ sound/
615 drivers-$(CONFIG_SAMPLES) += samples/
616 drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
617 net-y		:= net/
618 libs-y		:= lib/
619 core-y		:= usr/
620 virt-y		:= virt/
621 endif # KBUILD_EXTMOD
622 
623 # The all: target is the default when no target is given on the
624 # command line.
625 # This allow a user to issue only 'make' to build a kernel including modules
626 # Defaults to vmlinux, but the arch makefile usually adds further targets
627 all: vmlinux
628 
629 CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
630 	$(call cc-option,-fno-tree-loop-im) \
631 	$(call cc-disable-warning,maybe-uninitialized,)
632 export CFLAGS_GCOV
633 
634 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
635 ifdef CONFIG_FUNCTION_TRACER
636   CC_FLAGS_FTRACE := -pg
637 endif
638 
639 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
640 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
641 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
642 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
643 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
644 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
645 export RETPOLINE_CFLAGS
646 export RETPOLINE_VDSO_CFLAGS
647 
648 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
649 # values of the respective KBUILD_* variables
650 ARCH_CPPFLAGS :=
651 ARCH_AFLAGS :=
652 ARCH_CFLAGS :=
653 include arch/$(SRCARCH)/Makefile
654 
655 ifeq ($(dot-config),1)
656 ifeq ($(may-sync-config),1)
657 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
658 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
659 # because some architectures define CROSS_COMPILE there.
660 include include/config/auto.conf.cmd
661 
662 $(KCONFIG_CONFIG):
663 	@echo >&2 '***'
664 	@echo >&2 '*** Configuration file "$@" not found!'
665 	@echo >&2 '***'
666 	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
667 	@echo >&2 '*** "make menuconfig" or "make xconfig").'
668 	@echo >&2 '***'
669 	@/bin/false
670 
671 # The actual configuration files used during the build are stored in
672 # include/generated/ and include/config/. Update them if .config is newer than
673 # include/config/auto.conf (which mirrors .config).
674 #
675 # This exploits the 'multi-target pattern rule' trick.
676 # The syncconfig should be executed only once to make all the targets.
677 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
678 	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
679 else
680 # External modules and some install targets need include/generated/autoconf.h
681 # and include/config/auto.conf but do not care if they are up-to-date.
682 # Use auto.conf to trigger the test
683 PHONY += include/config/auto.conf
684 
685 include/config/auto.conf:
686 	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
687 	echo >&2;							\
688 	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
689 	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
690 	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
691 	echo >&2 ;							\
692 	/bin/false)
693 
694 endif # may-sync-config
695 endif # $(dot-config)
696 
697 KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
698 KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
699 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
700 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
701 KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
702 
703 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
704 KBUILD_CFLAGS	+= -Os
705 else
706 KBUILD_CFLAGS   += -O2
707 endif
708 
709 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
710 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
711 endif
712 
713 # Tell gcc to never replace conditional load with a non-conditional one
714 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
715 
716 include scripts/Makefile.kcov
717 include scripts/Makefile.gcc-plugins
718 
719 ifdef CONFIG_READABLE_ASM
720 # Disable optimizations that make assembler listings hard to read.
721 # reorder blocks reorders the control in the function
722 # ipa clone creates specialized cloned functions
723 # partial inlining inlines only parts of functions
724 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
725                  $(call cc-option,-fno-ipa-cp-clone,) \
726                  $(call cc-option,-fno-partial-inlining)
727 endif
728 
729 ifneq ($(CONFIG_FRAME_WARN),0)
730 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
731 endif
732 
733 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
734 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
735 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
736 
737 KBUILD_CFLAGS += $(stackp-flags-y)
738 
739 ifdef CONFIG_CC_IS_CLANG
740 KBUILD_CPPFLAGS += -Qunused-arguments
741 KBUILD_CFLAGS += -Wno-format-invalid-specifier
742 KBUILD_CFLAGS += -Wno-gnu
743 # Quiet clang warning: comparison of unsigned expression < 0 is always false
744 KBUILD_CFLAGS += -Wno-tautological-compare
745 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
746 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
747 # See modpost pattern 2
748 KBUILD_CFLAGS += -mno-global-merge
749 else
750 
751 # These warnings generated too much noise in a regular build.
752 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
753 KBUILD_CFLAGS += -Wno-unused-but-set-variable
754 endif
755 
756 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
757 ifdef CONFIG_FRAME_POINTER
758 KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
759 else
760 # Some targets (ARM with Thumb2, for example), can't be built with frame
761 # pointers.  For those, we don't have FUNCTION_TRACER automatically
762 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
763 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
764 # -fomit-frame-pointer with FUNCTION_TRACER.
765 ifndef CONFIG_FUNCTION_TRACER
766 KBUILD_CFLAGS	+= -fomit-frame-pointer
767 endif
768 endif
769 
770 # Initialize all stack variables with a pattern, if desired.
771 ifdef CONFIG_INIT_STACK_ALL
772 KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
773 endif
774 
775 DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
776 
777 ifdef CONFIG_DEBUG_INFO
778 ifdef CONFIG_DEBUG_INFO_SPLIT
779 DEBUG_CFLAGS	+= -gsplit-dwarf
780 else
781 DEBUG_CFLAGS	+= -g
782 endif
783 KBUILD_AFLAGS	+= -Wa,-gdwarf-2
784 endif
785 ifdef CONFIG_DEBUG_INFO_DWARF4
786 DEBUG_CFLAGS	+= -gdwarf-4
787 endif
788 
789 ifdef CONFIG_DEBUG_INFO_REDUCED
790 DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
791 		   $(call cc-option,-fno-var-tracking)
792 endif
793 
794 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
795 export DEBUG_CFLAGS
796 
797 ifdef CONFIG_FUNCTION_TRACER
798 ifdef CONFIG_FTRACE_MCOUNT_RECORD
799   # gcc 5 supports generating the mcount tables directly
800   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
801     CC_FLAGS_FTRACE	+= -mrecord-mcount
802     export CC_USING_RECORD_MCOUNT := 1
803   endif
804   ifdef CONFIG_HAVE_NOP_MCOUNT
805     ifeq ($(call cc-option-yn, -mnop-mcount),y)
806       CC_FLAGS_FTRACE	+= -mnop-mcount
807       CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
808     endif
809   endif
810 endif
811 ifdef CONFIG_HAVE_FENTRY
812   ifeq ($(call cc-option-yn, -mfentry),y)
813     CC_FLAGS_FTRACE	+= -mfentry
814     CC_FLAGS_USING	+= -DCC_USING_FENTRY
815   endif
816 endif
817 export CC_FLAGS_FTRACE
818 KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
819 KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
820 ifdef CONFIG_DYNAMIC_FTRACE
821 	ifdef CONFIG_HAVE_C_RECORDMCOUNT
822 		BUILD_C_RECORDMCOUNT := y
823 		export BUILD_C_RECORDMCOUNT
824 	endif
825 endif
826 endif
827 
828 # We trigger additional mismatches with less inlining
829 ifdef CONFIG_DEBUG_SECTION_MISMATCH
830 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
831 endif
832 
833 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
834 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
835 LDFLAGS_vmlinux += --gc-sections
836 endif
837 
838 ifdef CONFIG_LIVEPATCH
839 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
840 endif
841 
842 # arch Makefile may override CC so keep this after arch Makefile is included
843 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
844 
845 # warn about C99 declaration after statement
846 KBUILD_CFLAGS += -Wdeclaration-after-statement
847 
848 # Warn about unmarked fall-throughs in switch statement.
849 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
850 
851 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
852 KBUILD_CFLAGS += -Wvla
853 
854 # disable pointer signed / unsigned warnings in gcc 4.0
855 KBUILD_CFLAGS += -Wno-pointer-sign
856 
857 # disable stringop warnings in gcc 8+
858 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
859 
860 # disable invalid "can't wrap" optimizations for signed / pointers
861 KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
862 
863 # clang sets -fmerge-all-constants by default as optimization, but this
864 # is non-conforming behavior for C and in fact breaks the kernel, so we
865 # need to disable it here generally.
866 KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
867 
868 # for gcc -fno-merge-all-constants disables everything, but it is fine
869 # to have actual conforming behavior enabled.
870 KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
871 
872 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
873 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
874 
875 # conserve stack if available
876 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
877 
878 # Prohibit date/time macros, which would make the build non-deterministic
879 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
880 
881 # enforce correct pointer usage
882 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
883 
884 # Require designated initializers for all marked structures
885 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
886 
887 # change __FILE__ to the relative path from the srctree
888 KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
889 
890 # ensure -fcf-protection is disabled when using retpoline as it is
891 # incompatible with -mindirect-branch=thunk-extern
892 ifdef CONFIG_RETPOLINE
893 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
894 endif
895 
896 # use the deterministic mode of AR if available
897 KBUILD_ARFLAGS := $(call ar-option,D)
898 
899 include scripts/Makefile.kasan
900 include scripts/Makefile.extrawarn
901 include scripts/Makefile.ubsan
902 
903 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
904 # last assignments
905 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
906 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
907 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
908 
909 KBUILD_LDFLAGS_MODULE += --build-id
910 LDFLAGS_vmlinux += --build-id
911 
912 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
913 LDFLAGS_vmlinux	+= $(call ld-option, -X,)
914 endif
915 
916 ifeq ($(CONFIG_RELR),y)
917 LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
918 endif
919 
920 # insure the checker run with the right endianness
921 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
922 
923 # the checker needs the correct machine size
924 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
925 
926 # Default kernel image to build when no specific target is given.
927 # KBUILD_IMAGE may be overruled on the command line or
928 # set in the environment
929 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
930 # this default value
931 export KBUILD_IMAGE ?= vmlinux
932 
933 #
934 # INSTALL_PATH specifies where to place the updated kernel and system map
935 # images. Default is /boot, but you can set it to other values
936 export	INSTALL_PATH ?= /boot
937 
938 #
939 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
940 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
941 # an argument if needed. Otherwise it defaults to the kernel install path
942 #
943 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
944 
945 #
946 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
947 # relocations required by build roots.  This is not defined in the
948 # makefile but the argument can be passed to make if needed.
949 #
950 
951 MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
952 export MODLIB
953 
954 #
955 # INSTALL_MOD_STRIP, if defined, will cause modules to be
956 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
957 # the default option --strip-debug will be used.  Otherwise,
958 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
959 
960 ifdef INSTALL_MOD_STRIP
961 ifeq ($(INSTALL_MOD_STRIP),1)
962 mod_strip_cmd = $(STRIP) --strip-debug
963 else
964 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
965 endif # INSTALL_MOD_STRIP=1
966 else
967 mod_strip_cmd = true
968 endif # INSTALL_MOD_STRIP
969 export mod_strip_cmd
970 
971 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
972 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
973 # or CONFIG_MODULE_COMPRESS_XZ.
974 
975 mod_compress_cmd = true
976 ifdef CONFIG_MODULE_COMPRESS
977   ifdef CONFIG_MODULE_COMPRESS_GZIP
978     mod_compress_cmd = gzip -n -f
979   endif # CONFIG_MODULE_COMPRESS_GZIP
980   ifdef CONFIG_MODULE_COMPRESS_XZ
981     mod_compress_cmd = xz -f
982   endif # CONFIG_MODULE_COMPRESS_XZ
983 endif # CONFIG_MODULE_COMPRESS
984 export mod_compress_cmd
985 
986 ifdef CONFIG_MODULE_SIG_ALL
987 $(eval $(call config_filename,MODULE_SIG_KEY))
988 
989 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
990 else
991 mod_sign_cmd = true
992 endif
993 export mod_sign_cmd
994 
995 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
996 
997 ifdef CONFIG_STACK_VALIDATION
998   has_libelf := $(call try-run,\
999 		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1000   ifeq ($(has_libelf),1)
1001     objtool_target := tools/objtool FORCE
1002   else
1003     SKIP_STACK_VALIDATION := 1
1004     export SKIP_STACK_VALIDATION
1005   endif
1006 endif
1007 
1008 PHONY += prepare0
1009 
1010 export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
1011 
1012 ifeq ($(KBUILD_EXTMOD),)
1013 core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1014 
1015 vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1016 		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1017 		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1018 
1019 vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1020 		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1021 			$(drivers-) $(net-) $(libs-) $(virt-))))
1022 
1023 init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
1024 core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
1025 drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
1026 net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
1027 libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1028 libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1029 virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
1030 
1031 # Externally visible symbols (used by link-vmlinux.sh)
1032 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1033 			      $(drivers-y) $(net-y) $(virt-y)
1034 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1035 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1036 export LDFLAGS_vmlinux
1037 # used by scripts/package/Makefile
1038 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1039 
1040 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1041 
1042 # Recurse until adjust_autoksyms.sh is satisfied
1043 PHONY += autoksyms_recursive
1044 ifdef CONFIG_TRIM_UNUSED_KSYMS
1045 autoksyms_recursive: $(vmlinux-deps) modules.order
1046 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1047 	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1048 endif
1049 
1050 # For the kernel to actually contain only the needed exported symbols,
1051 # we have to build modules as well to determine what those symbols are.
1052 # (this can be evaluated only once include/config/auto.conf has been included)
1053 ifdef CONFIG_TRIM_UNUSED_KSYMS
1054   KBUILD_MODULES := 1
1055 endif
1056 
1057 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1058 
1059 $(autoksyms_h):
1060 	$(Q)mkdir -p $(dir $@)
1061 	$(Q)touch $@
1062 
1063 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1064 
1065 # Final link of vmlinux with optional arch pass after final link
1066 cmd_link-vmlinux =                                                 \
1067 	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1068 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1069 
1070 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1071 	+$(call if_changed,link-vmlinux)
1072 
1073 targets := vmlinux
1074 
1075 # The actual objects are generated when descending,
1076 # make sure no implicit rule kicks in
1077 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1078 
1079 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1080 # Preset locale variables to speed up the build process. Limit locale
1081 # tweaks to this spot to avoid wrong language settings when running
1082 # make menuconfig etc.
1083 # Error messages still appears in the original language
1084 
1085 PHONY += $(vmlinux-dirs)
1086 $(vmlinux-dirs): prepare
1087 	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
1088 
1089 filechk_kernel.release = \
1090 	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1091 
1092 # Store (new) KERNELRELEASE string in include/config/kernel.release
1093 include/config/kernel.release: FORCE
1094 	$(call filechk,kernel.release)
1095 
1096 # Additional helpers built in scripts/
1097 # Carefully list dependencies so we do not try to build scripts twice
1098 # in parallel
1099 PHONY += scripts
1100 scripts: scripts_basic scripts_dtc
1101 	$(Q)$(MAKE) $(build)=$(@)
1102 
1103 # Things we need to do before we recursively start building the kernel
1104 # or the modules are listed in "prepare".
1105 # A multi level approach is used. prepareN is processed before prepareN-1.
1106 # archprepare is used in arch Makefiles and when processed asm symlink,
1107 # version.h and scripts_basic is processed / created.
1108 
1109 PHONY += prepare archprepare prepare3
1110 
1111 # prepare3 is used to check if we are building in a separate output directory,
1112 # and if so do:
1113 # 1) Check that make has not been executed in the kernel src $(srctree)
1114 prepare3: include/config/kernel.release
1115 ifdef building_out_of_srctree
1116 	@$(kecho) '  Using $(srctree) as source for kernel'
1117 	$(Q)if [ -f $(srctree)/.config -o \
1118 		 -d $(srctree)/include/config -o \
1119 		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1120 		echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
1121 		echo >&2 "  in the '$(srctree)' directory.";\
1122 		/bin/false; \
1123 	fi;
1124 endif
1125 
1126 archprepare: archheaders archscripts scripts prepare3 outputmakefile \
1127 	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1128 
1129 prepare0: archprepare
1130 	$(Q)$(MAKE) $(build)=scripts/mod
1131 	$(Q)$(MAKE) $(build)=.
1132 
1133 # All the preparing..
1134 prepare: prepare0 prepare-objtool
1135 
1136 # Support for using generic headers in asm-generic
1137 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1138 
1139 PHONY += asm-generic uapi-asm-generic
1140 asm-generic: uapi-asm-generic
1141 	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1142 	generic=include/asm-generic
1143 uapi-asm-generic:
1144 	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1145 	generic=include/uapi/asm-generic
1146 
1147 PHONY += prepare-objtool
1148 prepare-objtool: $(objtool_target)
1149 ifeq ($(SKIP_STACK_VALIDATION),1)
1150 ifdef CONFIG_UNWINDER_ORC
1151 	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1152 	@false
1153 else
1154 	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1155 endif
1156 endif
1157 
1158 # Generate some files
1159 # ---------------------------------------------------------------------------
1160 
1161 # KERNELRELEASE can change from a few different places, meaning version.h
1162 # needs to be updated, so this check is forced on all builds
1163 
1164 uts_len := 64
1165 define filechk_utsrelease.h
1166 	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1167 	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1168 	  exit 1;                                                         \
1169 	fi;                                                               \
1170 	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1171 endef
1172 
1173 define filechk_version.h
1174 	echo \#define LINUX_VERSION_CODE $(shell                         \
1175 	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1176 	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1177 endef
1178 
1179 $(version_h): FORCE
1180 	$(call filechk,version.h)
1181 	$(Q)rm -f $(old_version_h)
1182 
1183 include/generated/utsrelease.h: include/config/kernel.release FORCE
1184 	$(call filechk,utsrelease.h)
1185 
1186 PHONY += headerdep
1187 headerdep:
1188 	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1189 	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1190 
1191 # ---------------------------------------------------------------------------
1192 # Kernel headers
1193 
1194 #Default location for installed headers
1195 export INSTALL_HDR_PATH = $(objtree)/usr
1196 
1197 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1198       cmd_headers_install = \
1199 	mkdir -p $(INSTALL_HDR_PATH); \
1200 	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1201 	usr/include $(INSTALL_HDR_PATH)
1202 
1203 PHONY += headers_install
1204 headers_install: headers
1205 	$(call cmd,headers_install)
1206 
1207 PHONY += archheaders archscripts
1208 
1209 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1210 
1211 PHONY += headers
1212 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1213 	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1214 	  $(error Headers not exportable for the $(SRCARCH) architecture))
1215 	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1216 	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1217 
1218 PHONY += headers_check
1219 headers_check: headers
1220 	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1221 	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1222 
1223 ifdef CONFIG_HEADERS_INSTALL
1224 prepare: headers
1225 endif
1226 
1227 ifdef CONFIG_HEADERS_CHECK
1228 all: headers_check
1229 endif
1230 
1231 PHONY += scripts_unifdef
1232 scripts_unifdef: scripts_basic
1233 	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1234 
1235 # ---------------------------------------------------------------------------
1236 # Kernel selftest
1237 
1238 PHONY += kselftest
1239 kselftest:
1240 	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1241 
1242 PHONY += kselftest-clean
1243 kselftest-clean:
1244 	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1245 
1246 PHONY += kselftest-merge
1247 kselftest-merge:
1248 	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1249 	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1250 		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1251 	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1252 
1253 # ---------------------------------------------------------------------------
1254 # Devicetree files
1255 
1256 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1257 dtstree := arch/$(SRCARCH)/boot/dts
1258 endif
1259 
1260 ifneq ($(dtstree),)
1261 
1262 %.dtb: prepare3 scripts_dtc
1263 	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1264 
1265 PHONY += dtbs dtbs_install dt_binding_check
1266 dtbs dtbs_check: prepare3 scripts_dtc
1267 	$(Q)$(MAKE) $(build)=$(dtstree)
1268 
1269 dtbs_check: export CHECK_DTBS=1
1270 dtbs_check: dt_binding_check
1271 
1272 dtbs_install:
1273 	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
1274 
1275 ifdef CONFIG_OF_EARLY_FLATTREE
1276 all: dtbs
1277 endif
1278 
1279 endif
1280 
1281 PHONY += scripts_dtc
1282 scripts_dtc: scripts_basic
1283 	$(Q)$(MAKE) $(build)=scripts/dtc
1284 
1285 dt_binding_check: scripts_dtc
1286 	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1287 
1288 # ---------------------------------------------------------------------------
1289 # Modules
1290 
1291 ifdef CONFIG_MODULES
1292 
1293 # By default, build modules as well
1294 
1295 all: modules
1296 
1297 # Build modules
1298 #
1299 # A module can be listed more than once in obj-m resulting in
1300 # duplicate lines in modules.order files.  Those are removed
1301 # using awk while concatenating to the final file.
1302 
1303 PHONY += modules
1304 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1305 	@$(kecho) '  Building modules, stage 2.';
1306 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1307 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1308 
1309 modules.order: $(vmlinux-dirs)
1310 	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1311 
1312 modbuiltin-dirs := $(addprefix _modbuiltin_, $(vmlinux-dirs))
1313 
1314 modules.builtin: $(modbuiltin-dirs)
1315 	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(vmlinux-dirs)) > $@
1316 
1317 PHONY += $(modbuiltin-dirs)
1318 # tristate.conf is not included from this Makefile. Add it as a prerequisite
1319 # here to make it self-healing in case somebody accidentally removes it.
1320 $(modbuiltin-dirs): include/config/tristate.conf
1321 	$(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1322 
1323 # Target to prepare building external modules
1324 PHONY += modules_prepare
1325 modules_prepare: prepare
1326 
1327 # Target to install modules
1328 PHONY += modules_install
1329 modules_install: _modinst_ _modinst_post
1330 
1331 PHONY += _modinst_
1332 _modinst_:
1333 	@rm -rf $(MODLIB)/kernel
1334 	@rm -f $(MODLIB)/source
1335 	@mkdir -p $(MODLIB)/kernel
1336 	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1337 	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1338 		rm -f $(MODLIB)/build ; \
1339 		ln -s $(CURDIR) $(MODLIB)/build ; \
1340 	fi
1341 	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1342 	@sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1343 	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1344 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1345 
1346 # This depmod is only for convenience to give the initial
1347 # boot a modules.dep even before / is mounted read-write.  However the
1348 # boot script depmod is the master version.
1349 PHONY += _modinst_post
1350 _modinst_post: _modinst_
1351 	$(call cmd,depmod)
1352 
1353 ifeq ($(CONFIG_MODULE_SIG), y)
1354 PHONY += modules_sign
1355 modules_sign:
1356 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1357 endif
1358 
1359 else # CONFIG_MODULES
1360 
1361 # Modules not configured
1362 # ---------------------------------------------------------------------------
1363 
1364 PHONY += modules modules_install
1365 modules modules_install:
1366 	@echo >&2
1367 	@echo >&2 "The present kernel configuration has modules disabled."
1368 	@echo >&2 "Type 'make config' and enable loadable module support."
1369 	@echo >&2 "Then build a kernel with module support enabled."
1370 	@echo >&2
1371 	@exit 1
1372 
1373 endif # CONFIG_MODULES
1374 
1375 ###
1376 # Cleaning is done on three levels.
1377 # make clean     Delete most generated files
1378 #                Leave enough to build external modules
1379 # make mrproper  Delete the current configuration, and all generated files
1380 # make distclean Remove editor backup files, patch leftover files and the like
1381 
1382 # Directories & files removed with 'make clean'
1383 CLEAN_DIRS  += include/ksym
1384 CLEAN_FILES += modules.builtin.modinfo
1385 
1386 # Directories & files removed with 'make mrproper'
1387 MRPROPER_DIRS  += include/config include/generated          \
1388 		  arch/$(SRCARCH)/include/generated .tmp_objdiff
1389 MRPROPER_FILES += .config .config.old .version \
1390 		  Module.symvers \
1391 		  signing_key.pem signing_key.priv signing_key.x509	\
1392 		  x509.genkey extra_certificates signing_key.x509.keyid	\
1393 		  signing_key.x509.signer vmlinux-gdb.py
1394 
1395 # Directories & files removed with 'make distclean'
1396 DISTCLEAN_DIRS  +=
1397 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1398 
1399 # clean - Delete most, but leave enough to build external modules
1400 #
1401 clean: rm-dirs  := $(CLEAN_DIRS)
1402 clean: rm-files := $(CLEAN_FILES)
1403 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
1404 
1405 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1406 $(clean-dirs):
1407 	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1408 
1409 vmlinuxclean:
1410 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1411 	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1412 
1413 clean: archclean vmlinuxclean
1414 
1415 # mrproper - Delete all generated files, including .config
1416 #
1417 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1418 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1419 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1420 
1421 PHONY += $(mrproper-dirs) mrproper
1422 $(mrproper-dirs):
1423 	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1424 
1425 mrproper: clean $(mrproper-dirs)
1426 	$(call cmd,rmdirs)
1427 	$(call cmd,rmfiles)
1428 
1429 # distclean
1430 #
1431 distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1432 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1433 
1434 PHONY += distclean
1435 
1436 distclean: mrproper
1437 	$(call cmd,rmdirs)
1438 	$(call cmd,rmfiles)
1439 	@find $(srctree) $(RCS_FIND_IGNORE) \
1440 		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1441 		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1442 		-o -name 'core' \) \
1443 		-type f -print | xargs rm -f
1444 
1445 
1446 # Packaging of the kernel to various formats
1447 # ---------------------------------------------------------------------------
1448 package-dir	:= scripts/package
1449 
1450 %src-pkg: FORCE
1451 	$(Q)$(MAKE) $(build)=$(package-dir) $@
1452 %pkg: include/config/kernel.release FORCE
1453 	$(Q)$(MAKE) $(build)=$(package-dir) $@
1454 
1455 
1456 # Brief documentation of the typical targets used
1457 # ---------------------------------------------------------------------------
1458 
1459 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1460 boards := $(sort $(notdir $(boards)))
1461 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1462 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1463 
1464 PHONY += help
1465 help:
1466 	@echo  'Cleaning targets:'
1467 	@echo  '  clean		  - Remove most generated files but keep the config and'
1468 	@echo  '                    enough build support to build external modules'
1469 	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1470 	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1471 	@echo  ''
1472 	@echo  'Configuration targets:'
1473 	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1474 	@echo  ''
1475 	@echo  'Other generic targets:'
1476 	@echo  '  all		  - Build all targets marked with [*]'
1477 	@echo  '* vmlinux	  - Build the bare kernel'
1478 	@echo  '* modules	  - Build all modules'
1479 	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1480 	@echo  '  dir/            - Build all files in dir and below'
1481 	@echo  '  dir/file.[ois]  - Build specified target only'
1482 	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1483 	@echo  '                    (requires compiler support for LLVM assembly generation)'
1484 	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1485 	@echo  '                    (requires a recent binutils and recent build (System.map))'
1486 	@echo  '  dir/file.ko     - Build module including final link'
1487 	@echo  '  modules_prepare - Set up for building external modules'
1488 	@echo  '  tags/TAGS	  - Generate tags file for editors'
1489 	@echo  '  cscope	  - Generate cscope index'
1490 	@echo  '  gtags           - Generate GNU GLOBAL index'
1491 	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1492 	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1493 	@echo  '  image_name	  - Output the image name (use with make -s)'
1494 	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1495 	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1496 	 echo  ''
1497 	@echo  'Static analysers:'
1498 	@echo  '  checkstack      - Generate a list of stack hogs'
1499 	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1500 	@echo  '  versioncheck    - Sanity check on version.h usage'
1501 	@echo  '  includecheck    - Check for duplicate included header files'
1502 	@echo  '  export_report   - List the usages of all exported symbols'
1503 	@echo  '  headers_check   - Sanity check on exported headers'
1504 	@echo  '  headerdep       - Detect inclusion cycles in headers'
1505 	@echo  '  coccicheck      - Check with Coccinelle'
1506 	@echo  ''
1507 	@echo  'Kernel selftest:'
1508 	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1509 	@echo  '                    Build, install, and boot kernel before'
1510 	@echo  '                    running kselftest on it'
1511 	@echo  '  kselftest-clean - Remove all generated kselftest files'
1512 	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1513 	@echo  '                    .config.'
1514 	@echo  ''
1515 	@$(if $(dtstree), \
1516 		echo 'Devicetree:'; \
1517 		echo '* dtbs            - Build device tree blobs for enabled boards'; \
1518 		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1519 		echo '')
1520 
1521 	@echo 'Userspace tools targets:'
1522 	@echo '  use "make tools/help"'
1523 	@echo '  or  "cd tools; make help"'
1524 	@echo  ''
1525 	@echo  'Kernel packaging:'
1526 	@$(MAKE) $(build)=$(package-dir) help
1527 	@echo  ''
1528 	@echo  'Documentation targets:'
1529 	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1530 	@echo  ''
1531 	@echo  'Architecture specific targets ($(SRCARCH)):'
1532 	@$(if $(archhelp),$(archhelp),\
1533 		echo '  No architecture specific help defined for $(SRCARCH)')
1534 	@echo  ''
1535 	@$(if $(boards), \
1536 		$(foreach b, $(boards), \
1537 		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1538 		echo '')
1539 	@$(if $(board-dirs), \
1540 		$(foreach b, $(board-dirs), \
1541 		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1542 		printf "  %-16s - Show all of the above\\n" help-boards; \
1543 		echo '')
1544 
1545 	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1546 	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1547 	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1548 	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1549 	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1550 	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1551 	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1552 	@echo  '		1: warnings which may be relevant and do not occur too often'
1553 	@echo  '		2: warnings which occur quite often but may still be relevant'
1554 	@echo  '		3: more obscure warnings, can most likely be ignored'
1555 	@echo  '		Multiple levels can be combined with W=12 or W=123'
1556 	@echo  ''
1557 	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1558 	@echo  'For further info see the ./README file'
1559 
1560 
1561 help-board-dirs := $(addprefix help-,$(board-dirs))
1562 
1563 help-boards: $(help-board-dirs)
1564 
1565 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1566 
1567 $(help-board-dirs): help-%:
1568 	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1569 	@$(if $(boards-per-dir), \
1570 		$(foreach b, $(boards-per-dir), \
1571 		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1572 		echo '')
1573 
1574 
1575 # Documentation targets
1576 # ---------------------------------------------------------------------------
1577 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1578 	       linkcheckdocs dochelp refcheckdocs
1579 PHONY += $(DOC_TARGETS)
1580 $(DOC_TARGETS): scripts_basic FORCE
1581 	$(Q)$(MAKE) $(build)=Documentation $@
1582 
1583 # Misc
1584 # ---------------------------------------------------------------------------
1585 
1586 PHONY += scripts_gdb
1587 scripts_gdb: prepare0
1588 	$(Q)$(MAKE) $(build)=scripts/gdb
1589 	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1590 
1591 ifdef CONFIG_GDB_SCRIPTS
1592 all: scripts_gdb
1593 endif
1594 
1595 else # KBUILD_EXTMOD
1596 
1597 ###
1598 # External module support.
1599 # When building external modules the kernel used as basis is considered
1600 # read-only, and no consistency checks are made and the make
1601 # system is not used on the basis kernel. If updates are required
1602 # in the basis kernel ordinary make commands (without M=...) must
1603 # be used.
1604 #
1605 # The following are the only valid targets when building external
1606 # modules.
1607 # make M=dir clean     Delete all automatically generated files
1608 # make M=dir modules   Make all modules in specified dir
1609 # make M=dir	       Same as 'make M=dir modules'
1610 # make M=dir modules_install
1611 #                      Install the modules built in the module directory
1612 #                      Assumes install directory is already created
1613 
1614 # We are always building modules
1615 KBUILD_MODULES := 1
1616 
1617 PHONY += $(objtree)/Module.symvers
1618 $(objtree)/Module.symvers:
1619 	@test -e $(objtree)/Module.symvers || ( \
1620 	echo; \
1621 	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1622 	echo "           is missing; modules will have no dependencies and modversions."; \
1623 	echo )
1624 
1625 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1626 PHONY += $(module-dirs) modules
1627 $(module-dirs): prepare $(objtree)/Module.symvers
1628 	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
1629 
1630 modules: $(module-dirs)
1631 	@$(kecho) '  Building modules, stage 2.';
1632 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1633 
1634 PHONY += modules_install
1635 modules_install: _emodinst_ _emodinst_post
1636 
1637 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1638 PHONY += _emodinst_
1639 _emodinst_:
1640 	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1641 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1642 
1643 PHONY += _emodinst_post
1644 _emodinst_post: _emodinst_
1645 	$(call cmd,depmod)
1646 
1647 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1648 
1649 PHONY += $(clean-dirs) clean
1650 $(clean-dirs):
1651 	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1652 
1653 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1654 
1655 PHONY += help
1656 help:
1657 	@echo  '  Building external modules.'
1658 	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1659 	@echo  ''
1660 	@echo  '  modules         - default target, build the module(s)'
1661 	@echo  '  modules_install - install the module'
1662 	@echo  '  clean           - remove generated files in module directory only'
1663 	@echo  ''
1664 
1665 PHONY += prepare
1666 endif # KBUILD_EXTMOD
1667 
1668 clean: $(clean-dirs)
1669 	$(call cmd,rmdirs)
1670 	$(call cmd,rmfiles)
1671 	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1672 		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1673 		-o -name '*.ko.*' \
1674 		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1675 		-o -name '*.dwo' -o -name '*.lst' \
1676 		-o -name '*.su' -o -name '*.mod' \
1677 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1678 		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1679 		-o -name '*.asn1.[ch]' \
1680 		-o -name '*.symtypes' -o -name 'modules.order' \
1681 		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1682 		-o -name '*.c.[012]*.*' \
1683 		-o -name '*.ll' \
1684 		-o -name '*.gcno' \) -type f -print | xargs rm -f
1685 
1686 # Generate tags for editors
1687 # ---------------------------------------------------------------------------
1688 quiet_cmd_tags = GEN     $@
1689       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1690 
1691 tags TAGS cscope gtags: FORCE
1692 	$(call cmd,tags)
1693 
1694 # Scripts to check various things for consistency
1695 # ---------------------------------------------------------------------------
1696 
1697 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1698 
1699 includecheck:
1700 	find $(srctree)/* $(RCS_FIND_IGNORE) \
1701 		-name '*.[hcS]' -type f -print | sort \
1702 		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1703 
1704 versioncheck:
1705 	find $(srctree)/* $(RCS_FIND_IGNORE) \
1706 		-name '*.[hcS]' -type f -print | sort \
1707 		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1708 
1709 coccicheck:
1710 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1711 
1712 namespacecheck:
1713 	$(PERL) $(srctree)/scripts/namespace.pl
1714 
1715 export_report:
1716 	$(PERL) $(srctree)/scripts/export_report.pl
1717 
1718 PHONY += checkstack kernelrelease kernelversion image_name
1719 
1720 # UML needs a little special treatment here.  It wants to use the host
1721 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1722 # else wants $(ARCH), including people doing cross-builds, which means
1723 # that $(SUBARCH) doesn't work here.
1724 ifeq ($(ARCH), um)
1725 CHECKSTACK_ARCH := $(SUBARCH)
1726 else
1727 CHECKSTACK_ARCH := $(ARCH)
1728 endif
1729 checkstack:
1730 	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1731 	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1732 
1733 kernelrelease:
1734 	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1735 
1736 kernelversion:
1737 	@echo $(KERNELVERSION)
1738 
1739 image_name:
1740 	@echo $(KBUILD_IMAGE)
1741 
1742 # Clear a bunch of variables before executing the submake
1743 
1744 ifeq ($(quiet),silent_)
1745 tools_silent=s
1746 endif
1747 
1748 tools/: FORCE
1749 	$(Q)mkdir -p $(objtree)/tools
1750 	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1751 
1752 tools/%: FORCE
1753 	$(Q)mkdir -p $(objtree)/tools
1754 	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1755 
1756 # Single targets
1757 # ---------------------------------------------------------------------------
1758 # Single targets are compatible with:
1759 # - build with mixed source and output
1760 # - build with separate output dir 'make O=...'
1761 # - external modules
1762 #
1763 #  target-dir => where to store outputfile
1764 #  build-dir  => directory in kernel source tree to use
1765 
1766 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1767 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1768 
1769 %.i: prepare FORCE
1770 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1771 %.ll: prepare FORCE
1772 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1773 %.lst: prepare FORCE
1774 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1775 %.o: prepare FORCE
1776 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1777 %.s: prepare FORCE
1778 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1779 %.symtypes: prepare FORCE
1780 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1781 ifeq ($(KBUILD_EXTMOD),)
1782 # For the single build of an in-tree module, use a temporary file to avoid
1783 # the situation of modules_install installing an invalid modules.order.
1784 %.ko: MODORDER := .modules.tmp
1785 endif
1786 %.ko: prepare FORCE
1787 	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
1788 	$(Q)echo $(build-target) > $(MODORDER)
1789 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1790 
1791 # Modules
1792 PHONY += /
1793 /: ./
1794 
1795 %/: prepare FORCE
1796 	$(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) need-modorder=1
1797 
1798 # FIXME Should go into a make.lib or something
1799 # ===========================================================================
1800 
1801 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1802       cmd_rmdirs = rm -rf $(rm-dirs)
1803 
1804 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1805       cmd_rmfiles = rm -f $(rm-files)
1806 
1807 # Run depmod only if we have System.map and depmod is executable
1808 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1809       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1810                    $(KERNELRELEASE)
1811 
1812 # read saved command lines for existing targets
1813 existing-targets := $(wildcard $(sort $(targets)))
1814 
1815 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1816 
1817 endif   # ifeq ($(config-targets),1)
1818 endif   # ifeq ($(mixed-targets),1)
1819 endif   # need-sub-make
1820 
1821 PHONY += FORCE
1822 FORCE:
1823 
1824 # Declare the contents of the PHONY variable as phony.  We keep that
1825 # information in a variable so we can use it in if_changed and friends.
1826 .PHONY: $(PHONY)