linux-4.20.0-rc2/Makefile

1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 4
3 PATCHLEVEL = 20
4 SUBLEVEL = 0
5 EXTRAVERSION = -rc2
6 NAME = "People's Front"
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 # Do not use make's built-in rules and variables
19 # (this increases performance and avoids hard-to-debug behaviour)
20 MAKEFLAGS += -rR
21 
22 # Avoid funny character set dependencies
23 unexport LC_ALL
24 LC_COLLATE=C
25 LC_NUMERIC=C
26 export LC_COLLATE LC_NUMERIC
27 
28 # Avoid interference with shell env settings
29 unexport GREP_OPTIONS
30 
31 # We are using a recursive build, so we need to do a little thinking
32 # to get the ordering right.
33 #
34 # Most importantly: sub-Makefiles should only ever modify files in
35 # their own directory. If in some directory we have a dependency on
36 # a file in another dir (which doesn't happen often, but it's often
37 # unavoidable when linking the built-in.a targets which finally
38 # turn into vmlinux), we will call a sub make in that other dir, and
39 # after that we are sure that everything which is in that other dir
40 # is now up to date.
41 #
42 # The only cases where we need to modify files which have global
43 # effects are thus separated out and done before the recursive
44 # descending is started. They are now explicitly listed as the
45 # prepare rule.
46 
47 # Beautify output
48 # ---------------------------------------------------------------------------
49 #
50 # Normally, we echo the whole command before executing it. By making
51 # that echo $($(quiet)$(cmd)), we now have the possibility to set
52 # $(quiet) to choose other forms of output instead, e.g.
53 #
54 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
55 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
56 #
57 # If $(quiet) is empty, the whole command will be printed.
58 # If it is set to "quiet_", only the short version will be printed.
59 # If it is set to "silent_", nothing will be printed at all, since
60 # the variable $(silent_cmd_cc_o_c) doesn't exist.
61 #
62 # A simple variant is to prefix commands with $(Q) - that's useful
63 # for commands that shall be hidden in non-verbose mode.
64 #
65 #	$(Q)ln $@ :<
66 #
67 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
68 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
69 #
70 # To put more focus on warnings, be less verbose as default
71 # Use 'make V=1' to see the full commands
72 
73 ifeq ("$(origin V)", "command line")
74   KBUILD_VERBOSE = $(V)
75 endif
76 ifndef KBUILD_VERBOSE
77   KBUILD_VERBOSE = 0
78 endif
79 
80 ifeq ($(KBUILD_VERBOSE),1)
81   quiet =
82   Q =
83 else
84   quiet=quiet_
85   Q = @
86 endif
87 
88 # If the user is running make -s (silent mode), suppress echoing of
89 # commands
90 
91 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
92   quiet=silent_
93   tools_silent=s
94 endif
95 
96 export quiet Q KBUILD_VERBOSE
97 
98 # kbuild supports saving output files in a separate directory.
99 # To locate output files in a separate directory two syntaxes are supported.
100 # In both cases the working directory must be the root of the kernel src.
101 # 1) O=
102 # Use "make O=dir/to/store/output/files/"
103 #
104 # 2) Set KBUILD_OUTPUT
105 # Set the environment variable KBUILD_OUTPUT to point to the directory
106 # where the output files shall be placed.
107 # export KBUILD_OUTPUT=dir/to/store/output/files/
108 # make
109 #
110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
111 # variable.
112 
113 # KBUILD_SRC is not intended to be used by the regular user (for now),
114 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
115 ifeq ($(KBUILD_SRC),)
116 
117 # OK, Make called in directory where kernel src resides
118 # Do we want to locate output files in a separate directory?
119 ifeq ("$(origin O)", "command line")
120   KBUILD_OUTPUT := $(O)
121 endif
122 
123 # Cancel implicit rules on top Makefile
124 $(CURDIR)/Makefile Makefile: ;
125 
126 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
127   $(error main directory cannot contain spaces nor colons)
128 endif
129 
130 ifneq ($(KBUILD_OUTPUT),)
131 # check that the output directory actually exists
132 saved-output := $(KBUILD_OUTPUT)
133 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
134 								&& pwd)
135 $(if $(KBUILD_OUTPUT),, \
136      $(error failed to create output directory "$(saved-output)"))
137 
138 # Look for make include files relative to root of kernel src
139 #
140 # This does not become effective immediately because MAKEFLAGS is re-parsed
141 # once after the Makefile is read.  It is OK since we are going to invoke
142 # 'sub-make' below.
143 MAKEFLAGS += --include-dir=$(CURDIR)
144 
145 PHONY += $(MAKECMDGOALS) sub-make
146 
147 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
148 	@:
149 
150 # Invoke a second make in the output directory, passing relevant variables
151 sub-make:
152 	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153 	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
154 
155 # Leave processing to above invocation of make
156 skip-makefile := 1
157 endif # ifneq ($(KBUILD_OUTPUT),)
158 endif # ifeq ($(KBUILD_SRC),)
159 
160 # We process the rest of the Makefile if this is the final invocation of make
161 ifeq ($(skip-makefile),)
162 
163 # Do not print "Entering directory ...",
164 # but we want to display it when entering to the output directory
165 # so that IDEs/editors are able to understand relative filenames.
166 MAKEFLAGS += --no-print-directory
167 
168 # Call a source code checker (by default, "sparse") as part of the
169 # C compilation.
170 #
171 # Use 'make C=1' to enable checking of only re-compiled files.
172 # Use 'make C=2' to enable checking of *all* source files, regardless
173 # of whether they are re-compiled or not.
174 #
175 # See the file "Documentation/dev-tools/sparse.rst" for more details,
176 # including where to get the "sparse" utility.
177 
178 ifeq ("$(origin C)", "command line")
179   KBUILD_CHECKSRC = $(C)
180 endif
181 ifndef KBUILD_CHECKSRC
182   KBUILD_CHECKSRC = 0
183 endif
184 
185 # Use make M=dir to specify directory of external module to build
186 # Old syntax make ... SUBDIRS=$PWD is still supported
187 # Setting the environment variable KBUILD_EXTMOD take precedence
188 ifdef SUBDIRS
189   KBUILD_EXTMOD ?= $(SUBDIRS)
190 endif
191 
192 ifeq ("$(origin M)", "command line")
193   KBUILD_EXTMOD := $(M)
194 endif
195 
196 ifeq ($(KBUILD_SRC),)
197         # building in the source tree
198         srctree := .
199 else
200         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
201                 # building in a subdirectory of the source tree
202                 srctree := ..
203         else
204                 srctree := $(KBUILD_SRC)
205         endif
206 endif
207 
208 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
209 
210 objtree		:= .
211 src		:= $(srctree)
212 obj		:= $(objtree)
213 
214 VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215 
216 export srctree objtree VPATH
217 
218 # To make sure we do not include .config for any of the *config targets
219 # catch them early, and hand them over to scripts/kconfig/Makefile
220 # It is allowed to specify more targets when calling make, including
221 # mixing *config targets and build targets.
222 # For example 'make oldconfig all'.
223 # Detect when mixed targets is specified, and make a second invocation
224 # of make so .config is not included in this case either (for *config).
225 
226 version_h := include/generated/uapi/linux/version.h
227 old_version_h := include/linux/version.h
228 
229 clean-targets := %clean mrproper cleandocs
230 no-dot-config-targets := $(clean-targets) \
231 			 cscope gtags TAGS tags help% %docs check% coccicheck \
232 			 $(version_h) headers_% archheaders archscripts \
233 			 %asm-generic kernelversion %src-pkg
234 no-sync-config-targets := $(no-dot-config-targets) install %install \
235 			   kernelrelease
236 
237 config-targets  := 0
238 mixed-targets   := 0
239 dot-config      := 1
240 may-sync-config := 1
241 
242 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
243 	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
244 		dot-config := 0
245 	endif
246 endif
247 
248 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
249 	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
250 		may-sync-config := 0
251 	endif
252 endif
253 
254 ifneq ($(KBUILD_EXTMOD),)
255 	may-sync-config := 0
256 endif
257 
258 ifeq ($(KBUILD_EXTMOD),)
259         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
260                 config-targets := 1
261                 ifneq ($(words $(MAKECMDGOALS)),1)
262                         mixed-targets := 1
263                 endif
264         endif
265 endif
266 
267 # For "make -j clean all", "make -j mrproper defconfig all", etc.
268 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
269         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
270                 mixed-targets := 1
271         endif
272 endif
273 
274 # install and modules_install need also be processed one by one
275 ifneq ($(filter install,$(MAKECMDGOALS)),)
276         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
277 	        mixed-targets := 1
278         endif
279 endif
280 
281 ifeq ($(mixed-targets),1)
282 # ===========================================================================
283 # We're called with mixed targets (*config and build targets).
284 # Handle them one by one.
285 
286 PHONY += $(MAKECMDGOALS) __build_one_by_one
287 
288 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
289 	@:
290 
291 __build_one_by_one:
292 	$(Q)set -e; \
293 	for i in $(MAKECMDGOALS); do \
294 		$(MAKE) -f $(srctree)/Makefile $$i; \
295 	done
296 
297 else
298 
299 # We need some generic definitions (do not try to remake the file).
300 scripts/Kbuild.include: ;
301 include scripts/Kbuild.include
302 
303 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
304 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
305 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
306 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
307 
308 include scripts/subarch.include
309 
310 # Cross compiling and selecting different set of gcc/bin-utils
311 # ---------------------------------------------------------------------------
312 #
313 # When performing cross compilation for other architectures ARCH shall be set
314 # to the target architecture. (See arch/* for the possibilities).
315 # ARCH can be set during invocation of make:
316 # make ARCH=ia64
317 # Another way is to have ARCH set in the environment.
318 # The default ARCH is the host where make is executed.
319 
320 # CROSS_COMPILE specify the prefix used for all executables used
321 # during compilation. Only gcc and related bin-utils executables
322 # are prefixed with $(CROSS_COMPILE).
323 # CROSS_COMPILE can be set on the command line
324 # make CROSS_COMPILE=ia64-linux-
325 # Alternatively CROSS_COMPILE can be set in the environment.
326 # Default value for CROSS_COMPILE is not to prefix executables
327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
328 ARCH		?= $(SUBARCH)
329 
330 # Architecture as present in compile.h
331 UTS_MACHINE 	:= $(ARCH)
332 SRCARCH 	:= $(ARCH)
333 
334 # Additional ARCH settings for x86
335 ifeq ($(ARCH),i386)
336         SRCARCH := x86
337 endif
338 ifeq ($(ARCH),x86_64)
339         SRCARCH := x86
340 endif
341 
342 # Additional ARCH settings for sparc
343 ifeq ($(ARCH),sparc32)
344        SRCARCH := sparc
345 endif
346 ifeq ($(ARCH),sparc64)
347        SRCARCH := sparc
348 endif
349 
350 # Additional ARCH settings for sh
351 ifeq ($(ARCH),sh64)
352        SRCARCH := sh
353 endif
354 
355 KCONFIG_CONFIG	?= .config
356 export KCONFIG_CONFIG
357 
358 # SHELL used by kbuild
359 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
360 	  else if [ -x /bin/bash ]; then echo /bin/bash; \
361 	  else echo sh; fi ; fi)
362 
363 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
364 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
365 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
366 
367 HOSTCC       = gcc
368 HOSTCXX      = g++
369 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
370 		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
371 		$(HOSTCFLAGS)
372 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
373 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
374 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
375 
376 # Make variables (CC, etc...)
377 AS		= $(CROSS_COMPILE)as
378 LD		= $(CROSS_COMPILE)ld
379 CC		= $(CROSS_COMPILE)gcc
380 CPP		= $(CC) -E
381 AR		= $(CROSS_COMPILE)ar
382 NM		= $(CROSS_COMPILE)nm
383 STRIP		= $(CROSS_COMPILE)strip
384 OBJCOPY		= $(CROSS_COMPILE)objcopy
385 OBJDUMP		= $(CROSS_COMPILE)objdump
386 LEX		= flex
387 YACC		= bison
388 AWK		= awk
389 GENKSYMS	= scripts/genksyms/genksyms
390 INSTALLKERNEL  := installkernel
391 DEPMOD		= /sbin/depmod
392 PERL		= perl
393 PYTHON		= python
394 PYTHON2		= python2
395 PYTHON3		= python3
396 CHECK		= sparse
397 
398 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
399 		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
400 NOSTDINC_FLAGS  =
401 CFLAGS_MODULE   =
402 AFLAGS_MODULE   =
403 LDFLAGS_MODULE  =
404 CFLAGS_KERNEL	=
405 AFLAGS_KERNEL	=
406 LDFLAGS_vmlinux =
407 
408 # Use USERINCLUDE when you must reference the UAPI directories only.
409 USERINCLUDE    := \
410 		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
411 		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
412 		-I$(srctree)/include/uapi \
413 		-I$(objtree)/include/generated/uapi \
414                 -include $(srctree)/include/linux/kconfig.h
415 
416 # Use LINUXINCLUDE when you must reference the include/ directory.
417 # Needed to be compatible with the O= option
418 LINUXINCLUDE    := \
419 		-I$(srctree)/arch/$(SRCARCH)/include \
420 		-I$(objtree)/arch/$(SRCARCH)/include/generated \
421 		$(if $(KBUILD_SRC), -I$(srctree)/include) \
422 		-I$(objtree)/include \
423 		$(USERINCLUDE)
424 
425 KBUILD_AFLAGS   := -D__ASSEMBLY__
426 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
427 		   -fno-strict-aliasing -fno-common -fshort-wchar \
428 		   -Werror-implicit-function-declaration \
429 		   -Wno-format-security \
430 		   -std=gnu89
431 KBUILD_CPPFLAGS := -D__KERNEL__
432 KBUILD_AFLAGS_KERNEL :=
433 KBUILD_CFLAGS_KERNEL :=
434 KBUILD_AFLAGS_MODULE  := -DMODULE
435 KBUILD_CFLAGS_MODULE  := -DMODULE
436 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
437 KBUILD_LDFLAGS :=
438 GCC_PLUGINS_CFLAGS :=
439 
440 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
441 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
442 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
443 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
444 
445 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
446 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
447 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
448 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
449 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
450 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
451 export KBUILD_ARFLAGS
452 
453 # When compiling out-of-tree modules, put MODVERDIR in the module
454 # tree rather than in the kernel tree. The kernel tree might
455 # even be read-only.
456 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
457 
458 # Files to ignore in find ... statements
459 
460 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
461 			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
462 			  -prune -o
463 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
464 			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
465 
466 # ===========================================================================
467 # Rules shared between *config targets and build targets
468 
469 # Basic helpers built in scripts/basic/
470 PHONY += scripts_basic
471 scripts_basic:
472 	$(Q)$(MAKE) $(build)=scripts/basic
473 	$(Q)rm -f .tmp_quiet_recordmcount
474 
475 # To avoid any implicit rule to kick in, define an empty command.
476 scripts/basic/%: scripts_basic ;
477 
478 PHONY += outputmakefile
479 # outputmakefile generates a Makefile in the output directory, if using a
480 # separate output directory. This allows convenient use of make in the
481 # output directory.
482 outputmakefile:
483 ifneq ($(KBUILD_SRC),)
484 	$(Q)ln -fsn $(srctree) source
485 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
486 endif
487 
488 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
489 ifneq ($(CROSS_COMPILE),)
490 CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
491 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
492 CLANG_PREFIX	:= --prefix=$(GCC_TOOLCHAIN_DIR)
493 GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
494 endif
495 ifneq ($(GCC_TOOLCHAIN),)
496 CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
497 endif
498 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
499 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
500 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
501 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
502 endif
503 
504 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
505 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
506 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
507 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
508 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
509 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
510 export RETPOLINE_CFLAGS
511 export RETPOLINE_VDSO_CFLAGS
512 
513 KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
514 KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
515 
516 # check for 'asm goto'
517 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
518   CC_HAVE_ASM_GOTO := 1
519   KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
520   KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
521 endif
522 
523 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
524 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
525 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
526 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
527 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
528 
529 ifeq ($(config-targets),1)
530 # ===========================================================================
531 # *config targets only - make sure prerequisites are updated, and descend
532 # in scripts/kconfig to make the *config target
533 
534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
535 # KBUILD_DEFCONFIG may point out an alternative default configuration
536 # used for 'make defconfig'
537 include arch/$(SRCARCH)/Makefile
538 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
539 
540 config: scripts_basic outputmakefile FORCE
541 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
542 
543 %config: scripts_basic outputmakefile FORCE
544 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
545 
546 else
547 # ===========================================================================
548 # Build targets only - this includes vmlinux, arch specific targets, clean
549 # targets and others. In general all targets except *config targets.
550 
551 # If building an external module we do not care about the all: rule
552 # but instead _all depend on modules
553 PHONY += all
554 ifeq ($(KBUILD_EXTMOD),)
555 _all: all
556 else
557 _all: modules
558 endif
559 
560 # Decide whether to build built-in, modular, or both.
561 # Normally, just do built-in.
562 
563 KBUILD_MODULES :=
564 KBUILD_BUILTIN := 1
565 
566 # If we have only "make modules", don't compile built-in objects.
567 # When we're building modules with modversions, we need to consider
568 # the built-in objects during the descend as well, in order to
569 # make sure the checksums are up to date before we record them.
570 
571 ifeq ($(MAKECMDGOALS),modules)
572   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
573 endif
574 
575 # If we have "make <whatever> modules", compile modules
576 # in addition to whatever we do anyway.
577 # Just "make" or "make all" shall build modules as well
578 
579 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
580   KBUILD_MODULES := 1
581 endif
582 
583 ifeq ($(MAKECMDGOALS),)
584   KBUILD_MODULES := 1
585 endif
586 
587 export KBUILD_MODULES KBUILD_BUILTIN
588 
589 ifeq ($(KBUILD_EXTMOD),)
590 # Objects we will link into vmlinux / subdirs we need to visit
591 init-y		:= init/
592 drivers-y	:= drivers/ sound/ firmware/
593 net-y		:= net/
594 libs-y		:= lib/
595 core-y		:= usr/
596 virt-y		:= virt/
597 endif # KBUILD_EXTMOD
598 
599 ifeq ($(dot-config),1)
600 include include/config/auto.conf
601 endif
602 
603 # The all: target is the default when no target is given on the
604 # command line.
605 # This allow a user to issue only 'make' to build a kernel including modules
606 # Defaults to vmlinux, but the arch makefile usually adds further targets
607 all: vmlinux
608 
609 CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
610 	$(call cc-option,-fno-tree-loop-im) \
611 	$(call cc-disable-warning,maybe-uninitialized,)
612 export CFLAGS_GCOV
613 
614 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
615 ifdef CONFIG_FUNCTION_TRACER
616   CC_FLAGS_FTRACE := -pg
617 endif
618 
619 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
620 # values of the respective KBUILD_* variables
621 ARCH_CPPFLAGS :=
622 ARCH_AFLAGS :=
623 ARCH_CFLAGS :=
624 include arch/$(SRCARCH)/Makefile
625 
626 ifeq ($(dot-config),1)
627 ifeq ($(may-sync-config),1)
628 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
629 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
630 # because some architectures define CROSS_COMPILE there.
631 -include include/config/auto.conf.cmd
632 
633 # To avoid any implicit rule to kick in, define an empty command
634 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
635 
636 # The actual configuration files used during the build are stored in
637 # include/generated/ and include/config/. Update them if .config is newer than
638 # include/config/auto.conf (which mirrors .config).
639 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
640 	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
641 else
642 # External modules and some install targets need include/generated/autoconf.h
643 # and include/config/auto.conf but do not care if they are up-to-date.
644 # Use auto.conf to trigger the test
645 PHONY += include/config/auto.conf
646 
647 include/config/auto.conf:
648 	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
649 	echo >&2;							\
650 	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
651 	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
652 	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
653 	echo >&2 ;							\
654 	/bin/false)
655 
656 endif # may-sync-config
657 endif # $(dot-config)
658 
659 KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
660 KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
661 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
662 KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
663 KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
664 
665 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
666 KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
667 KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
668 else
669 ifdef CONFIG_PROFILE_ALL_BRANCHES
670 KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
671 else
672 KBUILD_CFLAGS   += -O2
673 endif
674 endif
675 
676 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
677 			$(call cc-disable-warning,maybe-uninitialized,))
678 
679 # Tell gcc to never replace conditional load with a non-conditional one
680 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
681 
682 include scripts/Makefile.kcov
683 include scripts/Makefile.gcc-plugins
684 
685 ifdef CONFIG_READABLE_ASM
686 # Disable optimizations that make assembler listings hard to read.
687 # reorder blocks reorders the control in the function
688 # ipa clone creates specialized cloned functions
689 # partial inlining inlines only parts of functions
690 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
691                  $(call cc-option,-fno-ipa-cp-clone,) \
692                  $(call cc-option,-fno-partial-inlining)
693 endif
694 
695 ifneq ($(CONFIG_FRAME_WARN),0)
696 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
697 endif
698 
699 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
700 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
701 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
702 
703 KBUILD_CFLAGS += $(stackp-flags-y)
704 
705 ifdef CONFIG_CC_IS_CLANG
706 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
707 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
708 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
709 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
710 # Quiet clang warning: comparison of unsigned expression < 0 is always false
711 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
712 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
713 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
714 # See modpost pattern 2
715 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
716 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
717 else
718 
719 # These warnings generated too much noise in a regular build.
720 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
721 KBUILD_CFLAGS += -Wno-unused-but-set-variable
722 endif
723 
724 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
725 ifdef CONFIG_FRAME_POINTER
726 KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
727 else
728 # Some targets (ARM with Thumb2, for example), can't be built with frame
729 # pointers.  For those, we don't have FUNCTION_TRACER automatically
730 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
731 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
732 # -fomit-frame-pointer with FUNCTION_TRACER.
733 ifndef CONFIG_FUNCTION_TRACER
734 KBUILD_CFLAGS	+= -fomit-frame-pointer
735 endif
736 endif
737 
738 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
739 
740 ifdef CONFIG_DEBUG_INFO
741 ifdef CONFIG_DEBUG_INFO_SPLIT
742 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
743 else
744 KBUILD_CFLAGS	+= -g
745 endif
746 KBUILD_AFLAGS	+= -Wa,-gdwarf-2
747 endif
748 ifdef CONFIG_DEBUG_INFO_DWARF4
749 KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
750 endif
751 
752 ifdef CONFIG_DEBUG_INFO_REDUCED
753 KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
754 		   $(call cc-option,-fno-var-tracking)
755 endif
756 
757 ifdef CONFIG_FUNCTION_TRACER
758 ifdef CONFIG_FTRACE_MCOUNT_RECORD
759   # gcc 5 supports generating the mcount tables directly
760   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
761     CC_FLAGS_FTRACE	+= -mrecord-mcount
762     export CC_USING_RECORD_MCOUNT := 1
763   endif
764   ifdef CONFIG_HAVE_NOP_MCOUNT
765     ifeq ($(call cc-option-yn, -mnop-mcount),y)
766       CC_FLAGS_FTRACE	+= -mnop-mcount
767       CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
768     endif
769   endif
770 endif
771 ifdef CONFIG_HAVE_FENTRY
772   ifeq ($(call cc-option-yn, -mfentry),y)
773     CC_FLAGS_FTRACE	+= -mfentry
774     CC_FLAGS_USING	+= -DCC_USING_FENTRY
775   endif
776 endif
777 export CC_FLAGS_FTRACE
778 KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
779 KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
780 ifdef CONFIG_DYNAMIC_FTRACE
781 	ifdef CONFIG_HAVE_C_RECORDMCOUNT
782 		BUILD_C_RECORDMCOUNT := y
783 		export BUILD_C_RECORDMCOUNT
784 	endif
785 endif
786 endif
787 
788 # We trigger additional mismatches with less inlining
789 ifdef CONFIG_DEBUG_SECTION_MISMATCH
790 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
791 endif
792 
793 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
794 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
795 LDFLAGS_vmlinux += --gc-sections
796 endif
797 
798 # arch Makefile may override CC so keep this after arch Makefile is included
799 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
800 
801 # warn about C99 declaration after statement
802 KBUILD_CFLAGS += -Wdeclaration-after-statement
803 
804 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
805 KBUILD_CFLAGS += $(call cc-option,-Wvla)
806 
807 # disable pointer signed / unsigned warnings in gcc 4.0
808 KBUILD_CFLAGS += -Wno-pointer-sign
809 
810 # disable stringop warnings in gcc 8+
811 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
812 
813 # disable invalid "can't wrap" optimizations for signed / pointers
814 KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
815 
816 # clang sets -fmerge-all-constants by default as optimization, but this
817 # is non-conforming behavior for C and in fact breaks the kernel, so we
818 # need to disable it here generally.
819 KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
820 
821 # for gcc -fno-merge-all-constants disables everything, but it is fine
822 # to have actual conforming behavior enabled.
823 KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
824 
825 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
826 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
827 
828 # conserve stack if available
829 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
830 
831 # disallow errors like 'EXPORT_GPL(foo);' with missing header
832 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
833 
834 # require functions to have arguments in prototypes, not empty 'int foo()'
835 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
836 
837 # Prohibit date/time macros, which would make the build non-deterministic
838 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
839 
840 # enforce correct pointer usage
841 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
842 
843 # Require designated initializers for all marked structures
844 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
845 
846 # change __FILE__ to the relative path from the srctree
847 KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
848 
849 # use the deterministic mode of AR if available
850 KBUILD_ARFLAGS := $(call ar-option,D)
851 
852 include scripts/Makefile.kasan
853 include scripts/Makefile.extrawarn
854 include scripts/Makefile.ubsan
855 
856 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
857 # last assignments
858 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
859 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
860 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
861 
862 # Use --build-id when available.
863 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
864 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
865 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
866 
867 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
868 LDFLAGS_vmlinux	+= $(call ld-option, -X,)
869 endif
870 
871 # insure the checker run with the right endianness
872 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
873 
874 # the checker needs the correct machine size
875 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
876 
877 # Default kernel image to build when no specific target is given.
878 # KBUILD_IMAGE may be overruled on the command line or
879 # set in the environment
880 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
881 # this default value
882 export KBUILD_IMAGE ?= vmlinux
883 
884 #
885 # INSTALL_PATH specifies where to place the updated kernel and system map
886 # images. Default is /boot, but you can set it to other values
887 export	INSTALL_PATH ?= /boot
888 
889 #
890 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
891 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
892 # an argument if needed. Otherwise it defaults to the kernel install path
893 #
894 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
895 
896 #
897 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
898 # relocations required by build roots.  This is not defined in the
899 # makefile but the argument can be passed to make if needed.
900 #
901 
902 MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
903 export MODLIB
904 
905 #
906 # INSTALL_MOD_STRIP, if defined, will cause modules to be
907 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
908 # the default option --strip-debug will be used.  Otherwise,
909 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
910 
911 ifdef INSTALL_MOD_STRIP
912 ifeq ($(INSTALL_MOD_STRIP),1)
913 mod_strip_cmd = $(STRIP) --strip-debug
914 else
915 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
916 endif # INSTALL_MOD_STRIP=1
917 else
918 mod_strip_cmd = true
919 endif # INSTALL_MOD_STRIP
920 export mod_strip_cmd
921 
922 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
923 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
924 # or CONFIG_MODULE_COMPRESS_XZ.
925 
926 mod_compress_cmd = true
927 ifdef CONFIG_MODULE_COMPRESS
928   ifdef CONFIG_MODULE_COMPRESS_GZIP
929     mod_compress_cmd = gzip -n -f
930   endif # CONFIG_MODULE_COMPRESS_GZIP
931   ifdef CONFIG_MODULE_COMPRESS_XZ
932     mod_compress_cmd = xz -f
933   endif # CONFIG_MODULE_COMPRESS_XZ
934 endif # CONFIG_MODULE_COMPRESS
935 export mod_compress_cmd
936 
937 # Select initial ramdisk compression format, default is gzip(1).
938 # This shall be used by the dracut(8) tool while creating an initramfs image.
939 #
940 INITRD_COMPRESS-y                  := gzip
941 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
942 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
943 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
944 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
945 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
946 # do not export INITRD_COMPRESS, since we didn't actually
947 # choose a sane default compression above.
948 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
949 
950 ifdef CONFIG_MODULE_SIG_ALL
951 $(eval $(call config_filename,MODULE_SIG_KEY))
952 
953 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
954 else
955 mod_sign_cmd = true
956 endif
957 export mod_sign_cmd
958 
959 ifdef CONFIG_STACK_VALIDATION
960   has_libelf := $(call try-run,\
961 		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
962   ifeq ($(has_libelf),1)
963     objtool_target := tools/objtool FORCE
964   else
965     ifdef CONFIG_UNWINDER_ORC
966       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
967     else
968       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
969     endif
970     SKIP_STACK_VALIDATION := 1
971     export SKIP_STACK_VALIDATION
972   endif
973 endif
974 
975 
976 ifeq ($(KBUILD_EXTMOD),)
977 core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
978 
979 vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
980 		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
981 		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
982 
983 vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
984 		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
985 
986 init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
987 core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
988 drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
989 net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
990 libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
991 libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
992 virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
993 
994 # Externally visible symbols (used by link-vmlinux.sh)
995 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
996 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
997 export KBUILD_VMLINUX_LIBS := $(libs-y1)
998 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
999 export LDFLAGS_vmlinux
1000 # used by scripts/package/Makefile
1001 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1002 
1003 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1004 
1005 # Recurse until adjust_autoksyms.sh is satisfied
1006 PHONY += autoksyms_recursive
1007 autoksyms_recursive: $(vmlinux-deps)
1008 ifdef CONFIG_TRIM_UNUSED_KSYMS
1009 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1010 	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1011 endif
1012 
1013 # For the kernel to actually contain only the needed exported symbols,
1014 # we have to build modules as well to determine what those symbols are.
1015 # (this can be evaluated only once include/config/auto.conf has been included)
1016 ifdef CONFIG_TRIM_UNUSED_KSYMS
1017   KBUILD_MODULES := 1
1018 endif
1019 
1020 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1021 
1022 $(autoksyms_h):
1023 	$(Q)mkdir -p $(dir $@)
1024 	$(Q)touch $@
1025 
1026 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1027 
1028 # Final link of vmlinux with optional arch pass after final link
1029 cmd_link-vmlinux =                                                 \
1030 	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1031 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1032 
1033 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1034 ifdef CONFIG_HEADERS_CHECK
1035 	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1036 endif
1037 ifdef CONFIG_GDB_SCRIPTS
1038 	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1039 endif
1040 	+$(call if_changed,link-vmlinux)
1041 
1042 # Build samples along the rest of the kernel. This needs headers_install.
1043 ifdef CONFIG_SAMPLES
1044 vmlinux-dirs += samples
1045 samples: headers_install
1046 endif
1047 
1048 # The actual objects are generated when descending,
1049 # make sure no implicit rule kicks in
1050 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1051 
1052 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1053 # Preset locale variables to speed up the build process. Limit locale
1054 # tweaks to this spot to avoid wrong language settings when running
1055 # make menuconfig etc.
1056 # Error messages still appears in the original language
1057 
1058 PHONY += $(vmlinux-dirs)
1059 $(vmlinux-dirs): prepare scripts
1060 	$(Q)$(MAKE) $(build)=$@ need-builtin=1
1061 
1062 define filechk_kernel.release
1063 	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1064 endef
1065 
1066 # Store (new) KERNELRELEASE string in include/config/kernel.release
1067 include/config/kernel.release: $(srctree)/Makefile FORCE
1068 	$(call filechk,kernel.release)
1069 
1070 # Additional helpers built in scripts/
1071 # Carefully list dependencies so we do not try to build scripts twice
1072 # in parallel
1073 PHONY += scripts
1074 scripts: scripts_basic scripts_dtc asm-generic gcc-plugins $(autoksyms_h)
1075 	$(Q)$(MAKE) $(build)=$(@)
1076 
1077 # Things we need to do before we recursively start building the kernel
1078 # or the modules are listed in "prepare".
1079 # A multi level approach is used. prepareN is processed before prepareN-1.
1080 # archprepare is used in arch Makefiles and when processed asm symlink,
1081 # version.h and scripts_basic is processed / created.
1082 
1083 # Listed in dependency order
1084 PHONY += prepare archprepare macroprepare prepare0 prepare1 prepare2 prepare3
1085 
1086 # prepare3 is used to check if we are building in a separate output directory,
1087 # and if so do:
1088 # 1) Check that make has not been executed in the kernel src $(srctree)
1089 prepare3: include/config/kernel.release
1090 ifneq ($(KBUILD_SRC),)
1091 	@$(kecho) '  Using $(srctree) as source for kernel'
1092 	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1093 		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1094 		echo >&2 "  in the '$(srctree)' directory.";\
1095 		/bin/false; \
1096 	fi;
1097 endif
1098 
1099 # prepare2 creates a makefile if using a separate output directory.
1100 # From this point forward, .config has been reprocessed, so any rules
1101 # that need to depend on updated CONFIG_* values can be checked here.
1102 prepare2: prepare3 outputmakefile asm-generic
1103 
1104 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1105 	$(cmd_crmodverdir)
1106 
1107 macroprepare: prepare1 archmacros
1108 
1109 archprepare: archheaders archscripts macroprepare scripts_basic
1110 
1111 prepare0: archprepare gcc-plugins
1112 	$(Q)$(MAKE) $(build)=.
1113 
1114 # All the preparing..
1115 prepare: prepare0 prepare-objtool
1116 
1117 # Support for using generic headers in asm-generic
1118 PHONY += asm-generic uapi-asm-generic
1119 asm-generic: uapi-asm-generic
1120 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1121 	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
1122 uapi-asm-generic:
1123 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1124 	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1125 
1126 PHONY += prepare-objtool
1127 prepare-objtool: $(objtool_target)
1128 
1129 # Generate some files
1130 # ---------------------------------------------------------------------------
1131 
1132 # KERNELRELEASE can change from a few different places, meaning version.h
1133 # needs to be updated, so this check is forced on all builds
1134 
1135 uts_len := 64
1136 define filechk_utsrelease.h
1137 	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1138 	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1139 	  exit 1;                                                         \
1140 	fi;                                                               \
1141 	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1142 endef
1143 
1144 define filechk_version.h
1145 	(echo \#define LINUX_VERSION_CODE $(shell                         \
1146 	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1147 	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1148 endef
1149 
1150 $(version_h): FORCE
1151 	$(call filechk,version.h)
1152 	$(Q)rm -f $(old_version_h)
1153 
1154 include/generated/utsrelease.h: include/config/kernel.release FORCE
1155 	$(call filechk,utsrelease.h)
1156 
1157 PHONY += headerdep
1158 headerdep:
1159 	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1160 	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1161 
1162 # ---------------------------------------------------------------------------
1163 # Kernel headers
1164 
1165 #Default location for installed headers
1166 export INSTALL_HDR_PATH = $(objtree)/usr
1167 
1168 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1169 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1170 
1171 PHONY += archheaders
1172 archheaders:
1173 
1174 PHONY += archscripts
1175 archscripts:
1176 
1177 PHONY += archmacros
1178 archmacros:
1179 
1180 PHONY += __headers
1181 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1182 	$(Q)$(MAKE) $(build)=scripts build_unifdef
1183 
1184 PHONY += headers_install_all
1185 headers_install_all:
1186 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1187 
1188 PHONY += headers_install
1189 headers_install: __headers
1190 	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1191 	  $(error Headers not exportable for the $(SRCARCH) architecture))
1192 	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1193 	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1194 
1195 PHONY += headers_check_all
1196 headers_check_all: headers_install_all
1197 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1198 
1199 PHONY += headers_check
1200 headers_check: headers_install
1201 	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1202 	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1203 
1204 # ---------------------------------------------------------------------------
1205 # Kernel selftest
1206 
1207 PHONY += kselftest
1208 kselftest:
1209 	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1210 
1211 PHONY += kselftest-clean
1212 kselftest-clean:
1213 	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1214 
1215 PHONY += kselftest-merge
1216 kselftest-merge:
1217 	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1218 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1219 		-m $(objtree)/.config \
1220 		$(srctree)/tools/testing/selftests/*/config
1221 	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1222 
1223 # ---------------------------------------------------------------------------
1224 # Devicetree files
1225 
1226 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1227 dtstree := arch/$(SRCARCH)/boot/dts
1228 endif
1229 
1230 ifneq ($(dtstree),)
1231 
1232 %.dtb: prepare3 scripts_dtc
1233 	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1234 
1235 PHONY += dtbs dtbs_install
1236 dtbs: prepare3 scripts_dtc
1237 	$(Q)$(MAKE) $(build)=$(dtstree)
1238 
1239 dtbs_install:
1240 	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
1241 
1242 ifdef CONFIG_OF_EARLY_FLATTREE
1243 all: dtbs
1244 endif
1245 
1246 endif
1247 
1248 PHONY += scripts_dtc
1249 scripts_dtc: scripts_basic
1250 	$(Q)$(MAKE) $(build)=scripts/dtc
1251 
1252 # ---------------------------------------------------------------------------
1253 # Modules
1254 
1255 ifdef CONFIG_MODULES
1256 
1257 # By default, build modules as well
1258 
1259 all: modules
1260 
1261 # Build modules
1262 #
1263 # A module can be listed more than once in obj-m resulting in
1264 # duplicate lines in modules.order files.  Those are removed
1265 # using awk while concatenating to the final file.
1266 
1267 PHONY += modules
1268 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1269 	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1270 	@$(kecho) '  Building modules, stage 2.';
1271 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1272 
1273 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1274 	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1275 
1276 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1277 	$(Q)$(MAKE) $(modbuiltin)=$*
1278 
1279 
1280 # Target to prepare building external modules
1281 PHONY += modules_prepare
1282 modules_prepare: prepare scripts
1283 
1284 # Target to install modules
1285 PHONY += modules_install
1286 modules_install: _modinst_ _modinst_post
1287 
1288 PHONY += _modinst_
1289 _modinst_:
1290 	@rm -rf $(MODLIB)/kernel
1291 	@rm -f $(MODLIB)/source
1292 	@mkdir -p $(MODLIB)/kernel
1293 	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1294 	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1295 		rm -f $(MODLIB)/build ; \
1296 		ln -s $(CURDIR) $(MODLIB)/build ; \
1297 	fi
1298 	@cp -f $(objtree)/modules.order $(MODLIB)/
1299 	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1300 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1301 
1302 # This depmod is only for convenience to give the initial
1303 # boot a modules.dep even before / is mounted read-write.  However the
1304 # boot script depmod is the master version.
1305 PHONY += _modinst_post
1306 _modinst_post: _modinst_
1307 	$(call cmd,depmod)
1308 
1309 ifeq ($(CONFIG_MODULE_SIG), y)
1310 PHONY += modules_sign
1311 modules_sign:
1312 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1313 endif
1314 
1315 else # CONFIG_MODULES
1316 
1317 # Modules not configured
1318 # ---------------------------------------------------------------------------
1319 
1320 PHONY += modules modules_install
1321 modules modules_install:
1322 	@echo >&2
1323 	@echo >&2 "The present kernel configuration has modules disabled."
1324 	@echo >&2 "Type 'make config' and enable loadable module support."
1325 	@echo >&2 "Then build a kernel with module support enabled."
1326 	@echo >&2
1327 	@exit 1
1328 
1329 endif # CONFIG_MODULES
1330 
1331 ###
1332 # Cleaning is done on three levels.
1333 # make clean     Delete most generated files
1334 #                Leave enough to build external modules
1335 # make mrproper  Delete the current configuration, and all generated files
1336 # make distclean Remove editor backup files, patch leftover files and the like
1337 
1338 # Directories & files removed with 'make clean'
1339 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1340 
1341 # Directories & files removed with 'make mrproper'
1342 MRPROPER_DIRS  += include/config usr/include include/generated          \
1343 		  arch/*/include/generated .tmp_objdiff
1344 MRPROPER_FILES += .config .config.old .version \
1345 		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1346 		  signing_key.pem signing_key.priv signing_key.x509	\
1347 		  x509.genkey extra_certificates signing_key.x509.keyid	\
1348 		  signing_key.x509.signer vmlinux-gdb.py
1349 
1350 # clean - Delete most, but leave enough to build external modules
1351 #
1352 clean: rm-dirs  := $(CLEAN_DIRS)
1353 clean: rm-files := $(CLEAN_FILES)
1354 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1355 
1356 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1357 $(clean-dirs):
1358 	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1359 
1360 vmlinuxclean:
1361 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1362 	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1363 
1364 clean: archclean vmlinuxclean
1365 
1366 # mrproper - Delete all generated files, including .config
1367 #
1368 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1369 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1370 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1371 
1372 PHONY += $(mrproper-dirs) mrproper archmrproper
1373 $(mrproper-dirs):
1374 	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1375 
1376 mrproper: clean archmrproper $(mrproper-dirs)
1377 	$(call cmd,rmdirs)
1378 	$(call cmd,rmfiles)
1379 
1380 # distclean
1381 #
1382 PHONY += distclean
1383 
1384 distclean: mrproper
1385 	@find $(srctree) $(RCS_FIND_IGNORE) \
1386 		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1387 		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1388 		-o -name 'core' \) \
1389 		-type f -print | xargs rm -f
1390 
1391 
1392 # Packaging of the kernel to various formats
1393 # ---------------------------------------------------------------------------
1394 package-dir	:= scripts/package
1395 
1396 %src-pkg: FORCE
1397 	$(Q)$(MAKE) $(build)=$(package-dir) $@
1398 %pkg: include/config/kernel.release FORCE
1399 	$(Q)$(MAKE) $(build)=$(package-dir) $@
1400 
1401 
1402 # Brief documentation of the typical targets used
1403 # ---------------------------------------------------------------------------
1404 
1405 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1406 boards := $(sort $(notdir $(boards)))
1407 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1408 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1409 
1410 PHONY += help
1411 help:
1412 	@echo  'Cleaning targets:'
1413 	@echo  '  clean		  - Remove most generated files but keep the config and'
1414 	@echo  '                    enough build support to build external modules'
1415 	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1416 	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1417 	@echo  ''
1418 	@echo  'Configuration targets:'
1419 	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1420 	@echo  ''
1421 	@echo  'Other generic targets:'
1422 	@echo  '  all		  - Build all targets marked with [*]'
1423 	@echo  '* vmlinux	  - Build the bare kernel'
1424 	@echo  '* modules	  - Build all modules'
1425 	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1426 	@echo  '  dir/            - Build all files in dir and below'
1427 	@echo  '  dir/file.[ois]  - Build specified target only'
1428 	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1429 	@echo  '                    (requires compiler support for LLVM assembly generation)'
1430 	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1431 	@echo  '                    (requires a recent binutils and recent build (System.map))'
1432 	@echo  '  dir/file.ko     - Build module including final link'
1433 	@echo  '  modules_prepare - Set up for building external modules'
1434 	@echo  '  tags/TAGS	  - Generate tags file for editors'
1435 	@echo  '  cscope	  - Generate cscope index'
1436 	@echo  '  gtags           - Generate GNU GLOBAL index'
1437 	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1438 	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1439 	@echo  '  image_name	  - Output the image name (use with make -s)'
1440 	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1441 	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1442 	 echo  ''
1443 	@echo  'Static analysers:'
1444 	@echo  '  checkstack      - Generate a list of stack hogs'
1445 	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1446 	@echo  '  versioncheck    - Sanity check on version.h usage'
1447 	@echo  '  includecheck    - Check for duplicate included header files'
1448 	@echo  '  export_report   - List the usages of all exported symbols'
1449 	@echo  '  headers_check   - Sanity check on exported headers'
1450 	@echo  '  headerdep       - Detect inclusion cycles in headers'
1451 	@echo  '  coccicheck      - Check with Coccinelle'
1452 	@echo  ''
1453 	@echo  'Kernel selftest:'
1454 	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1455 	@echo  '                    Build, install, and boot kernel before'
1456 	@echo  '                    running kselftest on it'
1457 	@echo  '  kselftest-clean - Remove all generated kselftest files'
1458 	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1459 	@echo  '                    .config.'
1460 	@echo  ''
1461 	@$(if $(dtstree), \
1462 		echo 'Devicetree:'; \
1463 		echo '* dtbs            - Build device tree blobs for enabled boards'; \
1464 		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1465 		echo '')
1466 
1467 	@echo 'Userspace tools targets:'
1468 	@echo '  use "make tools/help"'
1469 	@echo '  or  "cd tools; make help"'
1470 	@echo  ''
1471 	@echo  'Kernel packaging:'
1472 	@$(MAKE) $(build)=$(package-dir) help
1473 	@echo  ''
1474 	@echo  'Documentation targets:'
1475 	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1476 	@echo  ''
1477 	@echo  'Architecture specific targets ($(SRCARCH)):'
1478 	@$(if $(archhelp),$(archhelp),\
1479 		echo '  No architecture specific help defined for $(SRCARCH)')
1480 	@echo  ''
1481 	@$(if $(boards), \
1482 		$(foreach b, $(boards), \
1483 		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1484 		echo '')
1485 	@$(if $(board-dirs), \
1486 		$(foreach b, $(board-dirs), \
1487 		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1488 		printf "  %-16s - Show all of the above\\n" help-boards; \
1489 		echo '')
1490 
1491 	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1492 	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1493 	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1494 	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1495 	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1496 	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1497 	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1498 	@echo  '		1: warnings which may be relevant and do not occur too often'
1499 	@echo  '		2: warnings which occur quite often but may still be relevant'
1500 	@echo  '		3: more obscure warnings, can most likely be ignored'
1501 	@echo  '		Multiple levels can be combined with W=12 or W=123'
1502 	@echo  ''
1503 	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1504 	@echo  'For further info see the ./README file'
1505 
1506 
1507 help-board-dirs := $(addprefix help-,$(board-dirs))
1508 
1509 help-boards: $(help-board-dirs)
1510 
1511 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1512 
1513 $(help-board-dirs): help-%:
1514 	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1515 	@$(if $(boards-per-dir), \
1516 		$(foreach b, $(boards-per-dir), \
1517 		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1518 		echo '')
1519 
1520 
1521 # Documentation targets
1522 # ---------------------------------------------------------------------------
1523 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1524 	       linkcheckdocs dochelp refcheckdocs
1525 PHONY += $(DOC_TARGETS)
1526 $(DOC_TARGETS): scripts_basic FORCE
1527 	$(Q)$(MAKE) $(build)=Documentation $@
1528 
1529 else # KBUILD_EXTMOD
1530 
1531 ###
1532 # External module support.
1533 # When building external modules the kernel used as basis is considered
1534 # read-only, and no consistency checks are made and the make
1535 # system is not used on the basis kernel. If updates are required
1536 # in the basis kernel ordinary make commands (without M=...) must
1537 # be used.
1538 #
1539 # The following are the only valid targets when building external
1540 # modules.
1541 # make M=dir clean     Delete all automatically generated files
1542 # make M=dir modules   Make all modules in specified dir
1543 # make M=dir	       Same as 'make M=dir modules'
1544 # make M=dir modules_install
1545 #                      Install the modules built in the module directory
1546 #                      Assumes install directory is already created
1547 
1548 # We are always building modules
1549 KBUILD_MODULES := 1
1550 PHONY += crmodverdir
1551 crmodverdir:
1552 	$(cmd_crmodverdir)
1553 
1554 PHONY += $(objtree)/Module.symvers
1555 $(objtree)/Module.symvers:
1556 	@test -e $(objtree)/Module.symvers || ( \
1557 	echo; \
1558 	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1559 	echo "           is missing; modules will have no dependencies and modversions."; \
1560 	echo )
1561 
1562 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1563 PHONY += $(module-dirs) modules
1564 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1565 	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1566 
1567 modules: $(module-dirs)
1568 	@$(kecho) '  Building modules, stage 2.';
1569 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1570 
1571 PHONY += modules_install
1572 modules_install: _emodinst_ _emodinst_post
1573 
1574 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1575 PHONY += _emodinst_
1576 _emodinst_:
1577 	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1578 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1579 
1580 PHONY += _emodinst_post
1581 _emodinst_post: _emodinst_
1582 	$(call cmd,depmod)
1583 
1584 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1585 
1586 PHONY += $(clean-dirs) clean
1587 $(clean-dirs):
1588 	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1589 
1590 clean:	rm-dirs := $(MODVERDIR)
1591 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1592 
1593 PHONY += help
1594 help:
1595 	@echo  '  Building external modules.'
1596 	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1597 	@echo  ''
1598 	@echo  '  modules         - default target, build the module(s)'
1599 	@echo  '  modules_install - install the module'
1600 	@echo  '  clean           - remove generated files in module directory only'
1601 	@echo  ''
1602 
1603 # Dummies...
1604 PHONY += prepare scripts
1605 prepare: ;
1606 scripts: ;
1607 endif # KBUILD_EXTMOD
1608 
1609 clean: $(clean-dirs)
1610 	$(call cmd,rmdirs)
1611 	$(call cmd,rmfiles)
1612 	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1613 		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1614 		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1615 		-o -name '*.dwo' -o -name '*.lst' \
1616 		-o -name '*.su'  \
1617 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1618 		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1619 		-o -name '*.asn1.[ch]' \
1620 		-o -name '*.symtypes' -o -name 'modules.order' \
1621 		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1622 		-o -name '*.c.[012]*.*' \
1623 		-o -name '*.ll' \
1624 		-o -name '*.gcno' \) -type f -print | xargs rm -f
1625 
1626 # Generate tags for editors
1627 # ---------------------------------------------------------------------------
1628 quiet_cmd_tags = GEN     $@
1629       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1630 
1631 tags TAGS cscope gtags: FORCE
1632 	$(call cmd,tags)
1633 
1634 # Scripts to check various things for consistency
1635 # ---------------------------------------------------------------------------
1636 
1637 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1638 
1639 includecheck:
1640 	find $(srctree)/* $(RCS_FIND_IGNORE) \
1641 		-name '*.[hcS]' -type f -print | sort \
1642 		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1643 
1644 versioncheck:
1645 	find $(srctree)/* $(RCS_FIND_IGNORE) \
1646 		-name '*.[hcS]' -type f -print | sort \
1647 		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1648 
1649 coccicheck:
1650 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1651 
1652 namespacecheck:
1653 	$(PERL) $(srctree)/scripts/namespace.pl
1654 
1655 export_report:
1656 	$(PERL) $(srctree)/scripts/export_report.pl
1657 
1658 PHONY += checkstack kernelrelease kernelversion image_name
1659 
1660 # UML needs a little special treatment here.  It wants to use the host
1661 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1662 # else wants $(ARCH), including people doing cross-builds, which means
1663 # that $(SUBARCH) doesn't work here.
1664 ifeq ($(ARCH), um)
1665 CHECKSTACK_ARCH := $(SUBARCH)
1666 else
1667 CHECKSTACK_ARCH := $(ARCH)
1668 endif
1669 checkstack:
1670 	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1671 	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1672 
1673 kernelrelease:
1674 	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1675 
1676 kernelversion:
1677 	@echo $(KERNELVERSION)
1678 
1679 image_name:
1680 	@echo $(KBUILD_IMAGE)
1681 
1682 # Clear a bunch of variables before executing the submake
1683 tools/: FORCE
1684 	$(Q)mkdir -p $(objtree)/tools
1685 	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1686 
1687 tools/%: FORCE
1688 	$(Q)mkdir -p $(objtree)/tools
1689 	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1690 
1691 # Single targets
1692 # ---------------------------------------------------------------------------
1693 # Single targets are compatible with:
1694 # - build with mixed source and output
1695 # - build with separate output dir 'make O=...'
1696 # - external modules
1697 #
1698 #  target-dir => where to store outputfile
1699 #  build-dir  => directory in kernel source tree to use
1700 
1701 ifeq ($(KBUILD_EXTMOD),)
1702         build-dir  = $(patsubst %/,%,$(dir $@))
1703         target-dir = $(dir $@)
1704 else
1705         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1706         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1707         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1708 endif
1709 
1710 %.s: %.c prepare scripts FORCE
1711 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712 %.i: %.c prepare scripts FORCE
1713 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714 %.o: %.c prepare scripts FORCE
1715 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716 %.lst: %.c prepare scripts FORCE
1717 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718 %.s: %.S prepare scripts FORCE
1719 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720 %.o: %.S prepare scripts FORCE
1721 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1722 %.symtypes: %.c prepare scripts FORCE
1723 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724 %.ll: %.c prepare scripts FORCE
1725 	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1726 
1727 # Modules
1728 /: prepare scripts FORCE
1729 	$(cmd_crmodverdir)
1730 	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1731 	$(build)=$(build-dir)
1732 # Make sure the latest headers are built for Documentation
1733 Documentation/ samples/: headers_install
1734 %/: prepare scripts FORCE
1735 	$(cmd_crmodverdir)
1736 	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1737 	$(build)=$(build-dir)
1738 %.ko: prepare scripts FORCE
1739 	$(cmd_crmodverdir)
1740 	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1741 	$(build)=$(build-dir) $(@:.ko=.o)
1742 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1743 
1744 # FIXME Should go into a make.lib or something
1745 # ===========================================================================
1746 
1747 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1748       cmd_rmdirs = rm -rf $(rm-dirs)
1749 
1750 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1751       cmd_rmfiles = rm -f $(rm-files)
1752 
1753 # Run depmod only if we have System.map and depmod is executable
1754 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1755       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1756                    $(KERNELRELEASE)
1757 
1758 # Create temporary dir for module support files
1759 # clean it up only when building all modules
1760 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1761                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1762 
1763 # read all saved command lines
1764 cmd_files := $(wildcard .*.cmd)
1765 
1766 ifneq ($(cmd_files),)
1767   $(cmd_files): ;	# Do not try to update included dependency files
1768   include $(cmd_files)
1769 endif
1770 
1771 endif   # ifeq ($(config-targets),1)
1772 endif   # ifeq ($(mixed-targets),1)
1773 endif	# skip-makefile
1774 
1775 PHONY += FORCE
1776 FORCE:
1777 
1778 # Declare the contents of the PHONY variable as phony.  We keep that
1779 # information in a variable so we can use it in if_changed and friends.
1780 .PHONY: $(PHONY)