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TOMOYO Linux Cross Reference
Linux/Makefile

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 # SPDX-License-Identifier: GPL-2.0
  2 VERSION = 4
  3 PATCHLEVEL = 15
  4 SUBLEVEL = 18
  5 EXTRAVERSION =
  6 NAME = Fearless Coyote
  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 # o Do not use make's built-in rules and variables
 19 #   (this increases performance and avoids hard-to-debug behaviour);
 20 # o Look for make include files relative to root of kernel src
 21 MAKEFLAGS += -rR --include-dir=$(CURDIR)
 22 
 23 # Avoid funny character set dependencies
 24 unexport LC_ALL
 25 LC_COLLATE=C
 26 LC_NUMERIC=C
 27 export LC_COLLATE LC_NUMERIC
 28 
 29 # Avoid interference with shell env settings
 30 unexport GREP_OPTIONS
 31 
 32 # We are using a recursive build, so we need to do a little thinking
 33 # to get the ordering right.
 34 #
 35 # Most importantly: sub-Makefiles should only ever modify files in
 36 # their own directory. If in some directory we have a dependency on
 37 # a file in another dir (which doesn't happen often, but it's often
 38 # unavoidable when linking the built-in.o targets which finally
 39 # turn into vmlinux), we will call a sub make in that other dir, and
 40 # after that we are sure that everything which is in that other dir
 41 # is now up to date.
 42 #
 43 # The only cases where we need to modify files which have global
 44 # effects are thus separated out and done before the recursive
 45 # descending is started. They are now explicitly listed as the
 46 # prepare rule.
 47 
 48 # Beautify output
 49 # ---------------------------------------------------------------------------
 50 #
 51 # Normally, we echo the whole command before executing it. By making
 52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 53 # $(quiet) to choose other forms of output instead, e.g.
 54 #
 55 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 56 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 57 #
 58 # If $(quiet) is empty, the whole command will be printed.
 59 # If it is set to "quiet_", only the short version will be printed.
 60 # If it is set to "silent_", nothing will be printed at all, since
 61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 62 #
 63 # A simple variant is to prefix commands with $(Q) - that's useful
 64 # for commands that shall be hidden in non-verbose mode.
 65 #
 66 #       $(Q)ln $@ :<
 67 #
 68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 70 #
 71 # To put more focus on warnings, be less verbose as default
 72 # Use 'make V=1' to see the full commands
 73 
 74 ifeq ("$(origin V)", "command line")
 75   KBUILD_VERBOSE = $(V)
 76 endif
 77 ifndef KBUILD_VERBOSE
 78   KBUILD_VERBOSE = 0
 79 endif
 80 
 81 ifeq ($(KBUILD_VERBOSE),1)
 82   quiet =
 83   Q =
 84 else
 85   quiet=quiet_
 86   Q = @
 87 endif
 88 
 89 # If the user is running make -s (silent mode), suppress echoing of
 90 # commands
 91 
 92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
 93   quiet=silent_
 94   tools_silent=s
 95 endif
 96 
 97 export quiet Q KBUILD_VERBOSE
 98 
 99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
102 # 1) O=
103 # Use "make O=dir/to/store/output/files/"
104 #
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
109 # make
110 #
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
112 # variable.
113 
114 # KBUILD_SRC is not intended to be used by the regular user (for now),
115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116 ifeq ($(KBUILD_SRC),)
117 
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121   KBUILD_OUTPUT := $(O)
122 endif
123 
124 # Cancel implicit rules on top Makefile
125 $(CURDIR)/Makefile Makefile: ;
126 
127 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
128   $(error main directory cannot contain spaces nor colons)
129 endif
130 
131 ifneq ($(KBUILD_OUTPUT),)
132 # check that the output directory actually exists
133 saved-output := $(KBUILD_OUTPUT)
134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135                                                                 && pwd)
136 $(if $(KBUILD_OUTPUT),, \
137      $(error failed to create output directory "$(saved-output)"))
138 
139 PHONY += $(MAKECMDGOALS) sub-make
140 
141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142         @:
143 
144 # Invoke a second make in the output directory, passing relevant variables
145 sub-make:
146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148 
149 # Leave processing to above invocation of make
150 skip-makefile := 1
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
153 
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile),)
156 
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS += --no-print-directory
161 
162 # Call a source code checker (by default, "sparse") as part of the
163 # C compilation.
164 #
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
168 #
169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
170 # including where to get the "sparse" utility.
171 
172 ifeq ("$(origin C)", "command line")
173   KBUILD_CHECKSRC = $(C)
174 endif
175 ifndef KBUILD_CHECKSRC
176   KBUILD_CHECKSRC = 0
177 endif
178 
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
182 ifdef SUBDIRS
183   KBUILD_EXTMOD ?= $(SUBDIRS)
184 endif
185 
186 ifeq ("$(origin M)", "command line")
187   KBUILD_EXTMOD := $(M)
188 endif
189 
190 ifeq ($(KBUILD_SRC),)
191         # building in the source tree
192         srctree := .
193 else
194         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
195                 # building in a subdirectory of the source tree
196                 srctree := ..
197         else
198                 srctree := $(KBUILD_SRC)
199         endif
200 endif
201 
202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
203 
204 objtree         := .
205 src             := $(srctree)
206 obj             := $(objtree)
207 
208 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
209 
210 export srctree objtree VPATH
211 
212 # To make sure we do not include .config for any of the *config targets
213 # catch them early, and hand them over to scripts/kconfig/Makefile
214 # It is allowed to specify more targets when calling make, including
215 # mixing *config targets and build targets.
216 # For example 'make oldconfig all'.
217 # Detect when mixed targets is specified, and make a second invocation
218 # of make so .config is not included in this case either (for *config).
219 
220 version_h := include/generated/uapi/linux/version.h
221 old_version_h := include/linux/version.h
222 
223 no-dot-config-targets := clean mrproper distclean \
224                          cscope gtags TAGS tags help% %docs check% coccicheck \
225                          $(version_h) headers_% archheaders archscripts \
226                          kernelversion %src-pkg
227 
228 config-targets := 0
229 mixed-targets  := 0
230 dot-config     := 1
231 
232 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
233         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
234                 dot-config := 0
235         endif
236 endif
237 
238 ifeq ($(KBUILD_EXTMOD),)
239         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
240                 config-targets := 1
241                 ifneq ($(words $(MAKECMDGOALS)),1)
242                         mixed-targets := 1
243                 endif
244         endif
245 endif
246 # install and modules_install need also be processed one by one
247 ifneq ($(filter install,$(MAKECMDGOALS)),)
248         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
249                 mixed-targets := 1
250         endif
251 endif
252 
253 ifeq ($(mixed-targets),1)
254 # ===========================================================================
255 # We're called with mixed targets (*config and build targets).
256 # Handle them one by one.
257 
258 PHONY += $(MAKECMDGOALS) __build_one_by_one
259 
260 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
261         @:
262 
263 __build_one_by_one:
264         $(Q)set -e; \
265         for i in $(MAKECMDGOALS); do \
266                 $(MAKE) -f $(srctree)/Makefile $$i; \
267         done
268 
269 else
270 
271 # We need some generic definitions (do not try to remake the file).
272 scripts/Kbuild.include: ;
273 include scripts/Kbuild.include
274 
275 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
276 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
277 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
278 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
279 
280 # SUBARCH tells the usermode build what the underlying arch is.  That is set
281 # first, and if a usermode build is happening, the "ARCH=um" on the command
282 # line overrides the setting of ARCH below.  If a native build is happening,
283 # then ARCH is assigned, getting whatever value it gets normally, and
284 # SUBARCH is subsequently ignored.
285 
286 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
287                                   -e s/sun4u/sparc64/ \
288                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
289                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
290                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
291                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
292                                   -e s/riscv.*/riscv/)
293 
294 # Cross compiling and selecting different set of gcc/bin-utils
295 # ---------------------------------------------------------------------------
296 #
297 # When performing cross compilation for other architectures ARCH shall be set
298 # to the target architecture. (See arch/* for the possibilities).
299 # ARCH can be set during invocation of make:
300 # make ARCH=ia64
301 # Another way is to have ARCH set in the environment.
302 # The default ARCH is the host where make is executed.
303 
304 # CROSS_COMPILE specify the prefix used for all executables used
305 # during compilation. Only gcc and related bin-utils executables
306 # are prefixed with $(CROSS_COMPILE).
307 # CROSS_COMPILE can be set on the command line
308 # make CROSS_COMPILE=ia64-linux-
309 # Alternatively CROSS_COMPILE can be set in the environment.
310 # A third alternative is to store a setting in .config so that plain
311 # "make" in the configured kernel build directory always uses that.
312 # Default value for CROSS_COMPILE is not to prefix executables
313 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
314 ARCH            ?= $(SUBARCH)
315 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
316 
317 # Architecture as present in compile.h
318 UTS_MACHINE     := $(ARCH)
319 SRCARCH         := $(ARCH)
320 
321 # Additional ARCH settings for x86
322 ifeq ($(ARCH),i386)
323         SRCARCH := x86
324 endif
325 ifeq ($(ARCH),x86_64)
326         SRCARCH := x86
327 endif
328 
329 # Additional ARCH settings for sparc
330 ifeq ($(ARCH),sparc32)
331        SRCARCH := sparc
332 endif
333 ifeq ($(ARCH),sparc64)
334        SRCARCH := sparc
335 endif
336 
337 # Additional ARCH settings for sh
338 ifeq ($(ARCH),sh64)
339        SRCARCH := sh
340 endif
341 
342 # Additional ARCH settings for tile
343 ifeq ($(ARCH),tilepro)
344        SRCARCH := tile
345 endif
346 ifeq ($(ARCH),tilegx)
347        SRCARCH := tile
348 endif
349 
350 KCONFIG_CONFIG  ?= .config
351 export KCONFIG_CONFIG
352 
353 # SHELL used by kbuild
354 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
355           else if [ -x /bin/bash ]; then echo /bin/bash; \
356           else echo sh; fi ; fi)
357 
358 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
359 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
360 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
361 
362 HOSTCC       = gcc
363 HOSTCXX      = g++
364 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
365                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
366 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
367 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
368 HOST_LOADLIBES := $(HOST_LFS_LIBS)
369 
370 # Make variables (CC, etc...)
371 AS              = $(CROSS_COMPILE)as
372 LD              = $(CROSS_COMPILE)ld
373 CC              = $(CROSS_COMPILE)gcc
374 CPP             = $(CC) -E
375 AR              = $(CROSS_COMPILE)ar
376 NM              = $(CROSS_COMPILE)nm
377 STRIP           = $(CROSS_COMPILE)strip
378 OBJCOPY         = $(CROSS_COMPILE)objcopy
379 OBJDUMP         = $(CROSS_COMPILE)objdump
380 AWK             = awk
381 GENKSYMS        = scripts/genksyms/genksyms
382 INSTALLKERNEL  := installkernel
383 DEPMOD          = /sbin/depmod
384 PERL            = perl
385 PYTHON          = python
386 CHECK           = sparse
387 
388 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
389                   -Wbitwise -Wno-return-void $(CF)
390 NOSTDINC_FLAGS  =
391 CFLAGS_MODULE   =
392 AFLAGS_MODULE   =
393 LDFLAGS_MODULE  =
394 CFLAGS_KERNEL   =
395 AFLAGS_KERNEL   =
396 LDFLAGS_vmlinux =
397 
398 # Use USERINCLUDE when you must reference the UAPI directories only.
399 USERINCLUDE    := \
400                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
401                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
402                 -I$(srctree)/include/uapi \
403                 -I$(objtree)/include/generated/uapi \
404                 -include $(srctree)/include/linux/kconfig.h
405 
406 # Use LINUXINCLUDE when you must reference the include/ directory.
407 # Needed to be compatible with the O= option
408 LINUXINCLUDE    := \
409                 -I$(srctree)/arch/$(SRCARCH)/include \
410                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
411                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
412                 -I$(objtree)/include \
413                 $(USERINCLUDE)
414 
415 KBUILD_AFLAGS   := -D__ASSEMBLY__
416 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
417                    -fno-strict-aliasing -fno-common -fshort-wchar \
418                    -Werror-implicit-function-declaration \
419                    -Wno-format-security \
420                    -std=gnu89
421 KBUILD_CPPFLAGS := -D__KERNEL__
422 KBUILD_AFLAGS_KERNEL :=
423 KBUILD_CFLAGS_KERNEL :=
424 KBUILD_AFLAGS_MODULE  := -DMODULE
425 KBUILD_CFLAGS_MODULE  := -DMODULE
426 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
427 GCC_PLUGINS_CFLAGS :=
428 
429 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
430 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
431 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
432 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
433 
434 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
435 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
436 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
437 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
438 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
439 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
440 export KBUILD_ARFLAGS
441 
442 # When compiling out-of-tree modules, put MODVERDIR in the module
443 # tree rather than in the kernel tree. The kernel tree might
444 # even be read-only.
445 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
446 
447 # Files to ignore in find ... statements
448 
449 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
450                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
451                           -prune -o
452 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
453                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
454 
455 # ===========================================================================
456 # Rules shared between *config targets and build targets
457 
458 # Basic helpers built in scripts/basic/
459 PHONY += scripts_basic
460 scripts_basic:
461         $(Q)$(MAKE) $(build)=scripts/basic
462         $(Q)rm -f .tmp_quiet_recordmcount
463 
464 # To avoid any implicit rule to kick in, define an empty command.
465 scripts/basic/%: scripts_basic ;
466 
467 PHONY += outputmakefile
468 # outputmakefile generates a Makefile in the output directory, if using a
469 # separate output directory. This allows convenient use of make in the
470 # output directory.
471 outputmakefile:
472 ifneq ($(KBUILD_SRC),)
473         $(Q)ln -fsn $(srctree) source
474         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
475             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
476 endif
477 
478 ifeq ($(cc-name),clang)
479 ifneq ($(CROSS_COMPILE),)
480 CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
481 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
482 endif
483 ifneq ($(GCC_TOOLCHAIN),)
484 CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
485 endif
486 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
487 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
488 endif
489 
490 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
491 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
492 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
493 export RETPOLINE_CFLAGS
494 
495 ifeq ($(config-targets),1)
496 # ===========================================================================
497 # *config targets only - make sure prerequisites are updated, and descend
498 # in scripts/kconfig to make the *config target
499 
500 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
501 # KBUILD_DEFCONFIG may point out an alternative default configuration
502 # used for 'make defconfig'
503 include arch/$(SRCARCH)/Makefile
504 export KBUILD_DEFCONFIG KBUILD_KCONFIG
505 
506 config: scripts_basic outputmakefile FORCE
507         $(Q)$(MAKE) $(build)=scripts/kconfig $@
508 
509 %config: scripts_basic outputmakefile FORCE
510         $(Q)$(MAKE) $(build)=scripts/kconfig $@
511 
512 else
513 # ===========================================================================
514 # Build targets only - this includes vmlinux, arch specific targets, clean
515 # targets and others. In general all targets except *config targets.
516 
517 # If building an external module we do not care about the all: rule
518 # but instead _all depend on modules
519 PHONY += all
520 ifeq ($(KBUILD_EXTMOD),)
521 _all: all
522 else
523 _all: modules
524 endif
525 
526 # Decide whether to build built-in, modular, or both.
527 # Normally, just do built-in.
528 
529 KBUILD_MODULES :=
530 KBUILD_BUILTIN := 1
531 
532 # If we have only "make modules", don't compile built-in objects.
533 # When we're building modules with modversions, we need to consider
534 # the built-in objects during the descend as well, in order to
535 # make sure the checksums are up to date before we record them.
536 
537 ifeq ($(MAKECMDGOALS),modules)
538   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
539 endif
540 
541 # If we have "make <whatever> modules", compile modules
542 # in addition to whatever we do anyway.
543 # Just "make" or "make all" shall build modules as well
544 
545 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
546   KBUILD_MODULES := 1
547 endif
548 
549 ifeq ($(MAKECMDGOALS),)
550   KBUILD_MODULES := 1
551 endif
552 
553 export KBUILD_MODULES KBUILD_BUILTIN
554 
555 ifeq ($(KBUILD_EXTMOD),)
556 # Additional helpers built in scripts/
557 # Carefully list dependencies so we do not try to build scripts twice
558 # in parallel
559 PHONY += scripts
560 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
561          asm-generic gcc-plugins
562         $(Q)$(MAKE) $(build)=$(@)
563 
564 # Objects we will link into vmlinux / subdirs we need to visit
565 init-y          := init/
566 drivers-y       := drivers/ sound/ firmware/
567 net-y           := net/
568 libs-y          := lib/
569 core-y          := usr/
570 virt-y          := virt/
571 endif # KBUILD_EXTMOD
572 
573 ifeq ($(dot-config),1)
574 # Read in config
575 -include include/config/auto.conf
576 
577 ifeq ($(KBUILD_EXTMOD),)
578 # Read in dependencies to all Kconfig* files, make sure to run
579 # oldconfig if changes are detected.
580 -include include/config/auto.conf.cmd
581 
582 # To avoid any implicit rule to kick in, define an empty command
583 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
584 
585 # If .config is newer than include/config/auto.conf, someone tinkered
586 # with it and forgot to run make oldconfig.
587 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
588 # we execute the config step to be sure to catch updated Kconfig files
589 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
590         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
591 else
592 # external modules needs include/generated/autoconf.h and include/config/auto.conf
593 # but do not care if they are up-to-date. Use auto.conf to trigger the test
594 PHONY += include/config/auto.conf
595 
596 include/config/auto.conf:
597         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
598         echo >&2;                                                       \
599         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
600         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
601         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
602         echo >&2 ;                                                      \
603         /bin/false)
604 
605 endif # KBUILD_EXTMOD
606 
607 else
608 # Dummy target needed, because used as prerequisite
609 include/config/auto.conf: ;
610 endif # $(dot-config)
611 
612 # For the kernel to actually contain only the needed exported symbols,
613 # we have to build modules as well to determine what those symbols are.
614 # (this can be evaluated only once include/config/auto.conf has been included)
615 ifdef CONFIG_TRIM_UNUSED_KSYMS
616   KBUILD_MODULES := 1
617 endif
618 
619 # The all: target is the default when no target is given on the
620 # command line.
621 # This allow a user to issue only 'make' to build a kernel including modules
622 # Defaults to vmlinux, but the arch makefile usually adds further targets
623 all: vmlinux
624 
625 KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
626 KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
627 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
628 export CFLAGS_GCOV CFLAGS_KCOV
629 
630 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
631 # values of the respective KBUILD_* variables
632 ARCH_CPPFLAGS :=
633 ARCH_AFLAGS :=
634 ARCH_CFLAGS :=
635 include arch/$(SRCARCH)/Makefile
636 
637 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
638 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
639 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
640 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
641 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
642 
643 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
644 KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
645 KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
646 else
647 ifdef CONFIG_PROFILE_ALL_BRANCHES
648 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
649 else
650 KBUILD_CFLAGS   += -O2
651 endif
652 endif
653 
654 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
655                         $(call cc-disable-warning,maybe-uninitialized,))
656 
657 # Tell gcc to never replace conditional load with a non-conditional one
658 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
659 
660 # check for 'asm goto'
661 ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
662         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
663         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
664 endif
665 
666 include scripts/Makefile.kcov
667 include scripts/Makefile.gcc-plugins
668 
669 ifdef CONFIG_READABLE_ASM
670 # Disable optimizations that make assembler listings hard to read.
671 # reorder blocks reorders the control in the function
672 # ipa clone creates specialized cloned functions
673 # partial inlining inlines only parts of functions
674 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
675                  $(call cc-option,-fno-ipa-cp-clone,) \
676                  $(call cc-option,-fno-partial-inlining)
677 endif
678 
679 ifneq ($(CONFIG_FRAME_WARN),0)
680 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
681 endif
682 
683 # This selects the stack protector compiler flag. Testing it is delayed
684 # until after .config has been reprocessed, in the prepare-compiler-check
685 # target.
686 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
687   stackp-flag := -fstack-protector
688   stackp-name := REGULAR
689 else
690 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
691   stackp-flag := -fstack-protector-strong
692   stackp-name := STRONG
693 else
694   # Force off for distro compilers that enable stack protector by default.
695   stackp-flag := $(call cc-option, -fno-stack-protector)
696 endif
697 endif
698 # Find arch-specific stack protector compiler sanity-checking script.
699 ifdef CONFIG_CC_STACKPROTECTOR
700   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
701   stackp-check := $(wildcard $(stackp-path))
702 endif
703 KBUILD_CFLAGS += $(stackp-flag)
704 
705 ifeq ($(cc-name),clang)
706 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
707 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
708 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
709 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
710 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
711 # Quiet clang warning: comparison of unsigned expression < 0 is always false
712 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
713 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
714 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
715 # See modpost pattern 2
716 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
717 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
718 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
719 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
720 else
721 
722 # These warnings generated too much noise in a regular build.
723 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
724 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
725 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
726 endif
727 
728 ifdef CONFIG_FRAME_POINTER
729 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
730 else
731 # Some targets (ARM with Thumb2, for example), can't be built with frame
732 # pointers.  For those, we don't have FUNCTION_TRACER automatically
733 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
734 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
735 # -fomit-frame-pointer with FUNCTION_TRACER.
736 ifndef CONFIG_FUNCTION_TRACER
737 KBUILD_CFLAGS   += -fomit-frame-pointer
738 endif
739 endif
740 
741 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
742 
743 ifdef CONFIG_DEBUG_INFO
744 ifdef CONFIG_DEBUG_INFO_SPLIT
745 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
746 else
747 KBUILD_CFLAGS   += -g
748 endif
749 KBUILD_AFLAGS   += -Wa,-gdwarf-2
750 endif
751 ifdef CONFIG_DEBUG_INFO_DWARF4
752 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
753 endif
754 
755 ifdef CONFIG_DEBUG_INFO_REDUCED
756 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
757                    $(call cc-option,-fno-var-tracking)
758 endif
759 
760 ifdef CONFIG_FUNCTION_TRACER
761 ifndef CC_FLAGS_FTRACE
762 CC_FLAGS_FTRACE := -pg
763 endif
764 export CC_FLAGS_FTRACE
765 ifdef CONFIG_HAVE_FENTRY
766 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
767 endif
768 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
769 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
770 ifdef CONFIG_DYNAMIC_FTRACE
771         ifdef CONFIG_HAVE_C_RECORDMCOUNT
772                 BUILD_C_RECORDMCOUNT := y
773                 export BUILD_C_RECORDMCOUNT
774         endif
775 endif
776 endif
777 
778 # We trigger additional mismatches with less inlining
779 ifdef CONFIG_DEBUG_SECTION_MISMATCH
780 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
781 endif
782 
783 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
784 KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
785 KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
786 endif
787 
788 # arch Makefile may override CC so keep this after arch Makefile is included
789 NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
790 CHECKFLAGS     += $(NOSTDINC_FLAGS)
791 
792 # warn about C99 declaration after statement
793 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
794 
795 # disable pointer signed / unsigned warnings in gcc 4.0
796 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
797 
798 # disable invalid "can't wrap" optimizations for signed / pointers
799 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
800 
801 # clang sets -fmerge-all-constants by default as optimization, but this
802 # is non-conforming behavior for C and in fact breaks the kernel, so we
803 # need to disable it here generally.
804 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
805 
806 # for gcc -fno-merge-all-constants disables everything, but it is fine
807 # to have actual conforming behavior enabled.
808 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
809 
810 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
811 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
812 
813 # conserve stack if available
814 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
815 
816 # disallow errors like 'EXPORT_GPL(foo);' with missing header
817 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
818 
819 # require functions to have arguments in prototypes, not empty 'int foo()'
820 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
821 
822 # Prohibit date/time macros, which would make the build non-deterministic
823 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
824 
825 # enforce correct pointer usage
826 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
827 
828 # Require designated initializers for all marked structures
829 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
830 
831 # use the deterministic mode of AR if available
832 KBUILD_ARFLAGS := $(call ar-option,D)
833 
834 include scripts/Makefile.kasan
835 include scripts/Makefile.extrawarn
836 include scripts/Makefile.ubsan
837 
838 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
839 # last assignments
840 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
841 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
842 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
843 
844 # Use --build-id when available.
845 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
846                               $(call cc-ldoption, -Wl$(comma)--build-id,))
847 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
848 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
849 
850 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
851 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
852 endif
853 
854 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
855 LDFLAGS_vmlinux += $(call ld-option, -X,)
856 endif
857 
858 # Default kernel image to build when no specific target is given.
859 # KBUILD_IMAGE may be overruled on the command line or
860 # set in the environment
861 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
862 # this default value
863 export KBUILD_IMAGE ?= vmlinux
864 
865 #
866 # INSTALL_PATH specifies where to place the updated kernel and system map
867 # images. Default is /boot, but you can set it to other values
868 export  INSTALL_PATH ?= /boot
869 
870 #
871 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
872 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
873 # an argument if needed. Otherwise it defaults to the kernel install path
874 #
875 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
876 
877 #
878 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
879 # relocations required by build roots.  This is not defined in the
880 # makefile but the argument can be passed to make if needed.
881 #
882 
883 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
884 export MODLIB
885 
886 #
887 # INSTALL_MOD_STRIP, if defined, will cause modules to be
888 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
889 # the default option --strip-debug will be used.  Otherwise,
890 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
891 
892 ifdef INSTALL_MOD_STRIP
893 ifeq ($(INSTALL_MOD_STRIP),1)
894 mod_strip_cmd = $(STRIP) --strip-debug
895 else
896 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
897 endif # INSTALL_MOD_STRIP=1
898 else
899 mod_strip_cmd = true
900 endif # INSTALL_MOD_STRIP
901 export mod_strip_cmd
902 
903 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
904 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
905 # or CONFIG_MODULE_COMPRESS_XZ.
906 
907 mod_compress_cmd = true
908 ifdef CONFIG_MODULE_COMPRESS
909   ifdef CONFIG_MODULE_COMPRESS_GZIP
910     mod_compress_cmd = gzip -n -f
911   endif # CONFIG_MODULE_COMPRESS_GZIP
912   ifdef CONFIG_MODULE_COMPRESS_XZ
913     mod_compress_cmd = xz -f
914   endif # CONFIG_MODULE_COMPRESS_XZ
915 endif # CONFIG_MODULE_COMPRESS
916 export mod_compress_cmd
917 
918 # Select initial ramdisk compression format, default is gzip(1).
919 # This shall be used by the dracut(8) tool while creating an initramfs image.
920 #
921 INITRD_COMPRESS-y                  := gzip
922 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
923 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
924 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
925 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
926 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
927 # do not export INITRD_COMPRESS, since we didn't actually
928 # choose a sane default compression above.
929 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
930 
931 ifdef CONFIG_MODULE_SIG_ALL
932 $(eval $(call config_filename,MODULE_SIG_KEY))
933 
934 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
935 else
936 mod_sign_cmd = true
937 endif
938 export mod_sign_cmd
939 
940 ifdef CONFIG_STACK_VALIDATION
941   has_libelf := $(call try-run,\
942                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
943   ifeq ($(has_libelf),1)
944     objtool_target := tools/objtool FORCE
945   else
946     ifdef CONFIG_UNWINDER_ORC
947       $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
948     else
949       $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
950     endif
951     SKIP_STACK_VALIDATION := 1
952     export SKIP_STACK_VALIDATION
953   endif
954 endif
955 
956 
957 ifeq ($(KBUILD_EXTMOD),)
958 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
959 
960 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
961                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
962                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
963 
964 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
965                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
966 
967 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
968 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
969 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
970 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
971 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
972 libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
973 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
974 
975 # Externally visible symbols (used by link-vmlinux.sh)
976 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
977 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
978 export KBUILD_VMLINUX_LIBS := $(libs-y1)
979 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
980 export LDFLAGS_vmlinux
981 # used by scripts/package/Makefile
982 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
983 
984 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
985 
986 # Include targets which we want to execute sequentially if the rest of the
987 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
988 # evaluated more than once.
989 PHONY += vmlinux_prereq
990 vmlinux_prereq: $(vmlinux-deps) FORCE
991 ifdef CONFIG_HEADERS_CHECK
992         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
993 endif
994 ifdef CONFIG_GDB_SCRIPTS
995         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
996 endif
997 ifdef CONFIG_TRIM_UNUSED_KSYMS
998         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
999           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1000 endif
1001 
1002 # standalone target for easier testing
1003 include/generated/autoksyms.h: FORCE
1004         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1005 
1006 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1007 
1008 # Final link of vmlinux with optional arch pass after final link
1009 cmd_link-vmlinux =                                                 \
1010         $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1011         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1012 
1013 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1014         +$(call if_changed,link-vmlinux)
1015 
1016 # Build samples along the rest of the kernel
1017 ifdef CONFIG_SAMPLES
1018 vmlinux-dirs += samples
1019 endif
1020 
1021 # The actual objects are generated when descending,
1022 # make sure no implicit rule kicks in
1023 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1024 
1025 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1026 # Preset locale variables to speed up the build process. Limit locale
1027 # tweaks to this spot to avoid wrong language settings when running
1028 # make menuconfig etc.
1029 # Error messages still appears in the original language
1030 
1031 PHONY += $(vmlinux-dirs)
1032 $(vmlinux-dirs): prepare scripts
1033         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1034 
1035 define filechk_kernel.release
1036         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1037 endef
1038 
1039 # Store (new) KERNELRELEASE string in include/config/kernel.release
1040 include/config/kernel.release: include/config/auto.conf FORCE
1041         $(call filechk,kernel.release)
1042 
1043 
1044 # Things we need to do before we recursively start building the kernel
1045 # or the modules are listed in "prepare".
1046 # A multi level approach is used. prepareN is processed before prepareN-1.
1047 # archprepare is used in arch Makefiles and when processed asm symlink,
1048 # version.h and scripts_basic is processed / created.
1049 
1050 # Listed in dependency order
1051 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1052 
1053 # prepare3 is used to check if we are building in a separate output directory,
1054 # and if so do:
1055 # 1) Check that make has not been executed in the kernel src $(srctree)
1056 prepare3: include/config/kernel.release
1057 ifneq ($(KBUILD_SRC),)
1058         @$(kecho) '  Using $(srctree) as source for kernel'
1059         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1060                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1061                 echo >&2 "  in the '$(srctree)' directory.";\
1062                 /bin/false; \
1063         fi;
1064 endif
1065 
1066 # prepare2 creates a makefile if using a separate output directory.
1067 # From this point forward, .config has been reprocessed, so any rules
1068 # that need to depend on updated CONFIG_* values can be checked here.
1069 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1070 
1071 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1072                    include/config/auto.conf
1073         $(cmd_crmodverdir)
1074 
1075 archprepare: archheaders archscripts prepare1 scripts_basic
1076 
1077 prepare0: archprepare gcc-plugins
1078         $(Q)$(MAKE) $(build)=.
1079 
1080 # All the preparing..
1081 prepare: prepare0 prepare-objtool
1082 
1083 # Support for using generic headers in asm-generic
1084 PHONY += asm-generic uapi-asm-generic
1085 asm-generic: uapi-asm-generic
1086         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1087                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
1088 uapi-asm-generic:
1089         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1090                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1091 
1092 PHONY += prepare-objtool
1093 prepare-objtool: $(objtool_target)
1094 
1095 # Check for CONFIG flags that require compiler support. Abort the build
1096 # after .config has been processed, but before the kernel build starts.
1097 #
1098 # For security-sensitive CONFIG options, we don't want to fallback and/or
1099 # silently change which compiler flags will be used, since that leads to
1100 # producing kernels with different security feature characteristics
1101 # depending on the compiler used. (For example, "But I selected
1102 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1103 PHONY += prepare-compiler-check
1104 prepare-compiler-check: FORCE
1105 # Make sure compiler supports requested stack protector flag.
1106 ifdef stackp-name
1107   ifeq ($(call cc-option, $(stackp-flag)),)
1108         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1109                   $(stackp-flag) not supported by compiler >&2 && exit 1
1110   endif
1111 endif
1112 # Make sure compiler does not have buggy stack-protector support.
1113 ifdef stackp-check
1114   ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1115         @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1116                   $(stackp-flag) available but compiler is broken >&2 && exit 1
1117   endif
1118 endif
1119         @:
1120 
1121 # Generate some files
1122 # ---------------------------------------------------------------------------
1123 
1124 # KERNELRELEASE can change from a few different places, meaning version.h
1125 # needs to be updated, so this check is forced on all builds
1126 
1127 uts_len := 64
1128 define filechk_utsrelease.h
1129         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1130           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1131           exit 1;                                                         \
1132         fi;                                                               \
1133         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1134 endef
1135 
1136 define filechk_version.h
1137         (echo \#define LINUX_VERSION_CODE $(shell                         \
1138         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1139         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1140 endef
1141 
1142 $(version_h): $(srctree)/Makefile FORCE
1143         $(call filechk,version.h)
1144         $(Q)rm -f $(old_version_h)
1145 
1146 include/generated/utsrelease.h: include/config/kernel.release FORCE
1147         $(call filechk,utsrelease.h)
1148 
1149 PHONY += headerdep
1150 headerdep:
1151         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1152         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1153 
1154 # ---------------------------------------------------------------------------
1155 # Kernel headers
1156 
1157 #Default location for installed headers
1158 export INSTALL_HDR_PATH = $(objtree)/usr
1159 
1160 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1161 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1162 
1163 PHONY += archheaders
1164 archheaders:
1165 
1166 PHONY += archscripts
1167 archscripts:
1168 
1169 PHONY += __headers
1170 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1171         $(Q)$(MAKE) $(build)=scripts build_unifdef
1172 
1173 PHONY += headers_install_all
1174 headers_install_all:
1175         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1176 
1177 PHONY += headers_install
1178 headers_install: __headers
1179         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1180           $(error Headers not exportable for the $(SRCARCH) architecture))
1181         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1182         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1183 
1184 PHONY += headers_check_all
1185 headers_check_all: headers_install_all
1186         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1187 
1188 PHONY += headers_check
1189 headers_check: headers_install
1190         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1191         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1192 
1193 # ---------------------------------------------------------------------------
1194 # Kernel selftest
1195 
1196 PHONY += kselftest
1197 kselftest:
1198         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1199 
1200 PHONY += kselftest-clean
1201 kselftest-clean:
1202         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1203 
1204 PHONY += kselftest-merge
1205 kselftest-merge:
1206         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1207         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1208                 -m $(objtree)/.config \
1209                 $(srctree)/tools/testing/selftests/*/config
1210         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1211 
1212 # ---------------------------------------------------------------------------
1213 # Modules
1214 
1215 ifdef CONFIG_MODULES
1216 
1217 # By default, build modules as well
1218 
1219 all: modules
1220 
1221 # Build modules
1222 #
1223 # A module can be listed more than once in obj-m resulting in
1224 # duplicate lines in modules.order files.  Those are removed
1225 # using awk while concatenating to the final file.
1226 
1227 PHONY += modules
1228 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1229         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1230         @$(kecho) '  Building modules, stage 2.';
1231         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1232 
1233 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1234         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1235 
1236 %/modules.builtin: include/config/auto.conf
1237         $(Q)$(MAKE) $(modbuiltin)=$*
1238 
1239 
1240 # Target to prepare building external modules
1241 PHONY += modules_prepare
1242 modules_prepare: prepare scripts
1243 
1244 # Target to install modules
1245 PHONY += modules_install
1246 modules_install: _modinst_ _modinst_post
1247 
1248 PHONY += _modinst_
1249 _modinst_:
1250         @rm -rf $(MODLIB)/kernel
1251         @rm -f $(MODLIB)/source
1252         @mkdir -p $(MODLIB)/kernel
1253         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1254         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1255                 rm -f $(MODLIB)/build ; \
1256                 ln -s $(CURDIR) $(MODLIB)/build ; \
1257         fi
1258         @cp -f $(objtree)/modules.order $(MODLIB)/
1259         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1260         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1261 
1262 # This depmod is only for convenience to give the initial
1263 # boot a modules.dep even before / is mounted read-write.  However the
1264 # boot script depmod is the master version.
1265 PHONY += _modinst_post
1266 _modinst_post: _modinst_
1267         $(call cmd,depmod)
1268 
1269 ifeq ($(CONFIG_MODULE_SIG), y)
1270 PHONY += modules_sign
1271 modules_sign:
1272         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1273 endif
1274 
1275 else # CONFIG_MODULES
1276 
1277 # Modules not configured
1278 # ---------------------------------------------------------------------------
1279 
1280 PHONY += modules modules_install
1281 modules modules_install:
1282         @echo >&2
1283         @echo >&2 "The present kernel configuration has modules disabled."
1284         @echo >&2 "Type 'make config' and enable loadable module support."
1285         @echo >&2 "Then build a kernel with module support enabled."
1286         @echo >&2
1287         @exit 1
1288 
1289 endif # CONFIG_MODULES
1290 
1291 ###
1292 # Cleaning is done on three levels.
1293 # make clean     Delete most generated files
1294 #                Leave enough to build external modules
1295 # make mrproper  Delete the current configuration, and all generated files
1296 # make distclean Remove editor backup files, patch leftover files and the like
1297 
1298 # Directories & files removed with 'make clean'
1299 CLEAN_DIRS  += $(MODVERDIR)
1300 
1301 # Directories & files removed with 'make mrproper'
1302 MRPROPER_DIRS  += include/config usr/include include/generated          \
1303                   arch/*/include/generated .tmp_objdiff
1304 MRPROPER_FILES += .config .config.old .version \
1305                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1306                   signing_key.pem signing_key.priv signing_key.x509     \
1307                   x509.genkey extra_certificates signing_key.x509.keyid \
1308                   signing_key.x509.signer vmlinux-gdb.py
1309 
1310 # clean - Delete most, but leave enough to build external modules
1311 #
1312 clean: rm-dirs  := $(CLEAN_DIRS)
1313 clean: rm-files := $(CLEAN_FILES)
1314 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1315 
1316 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1317 $(clean-dirs):
1318         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1319 
1320 vmlinuxclean:
1321         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1322         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1323 
1324 clean: archclean vmlinuxclean
1325 
1326 # mrproper - Delete all generated files, including .config
1327 #
1328 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1329 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1330 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1331 
1332 PHONY += $(mrproper-dirs) mrproper archmrproper
1333 $(mrproper-dirs):
1334         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1335 
1336 mrproper: clean archmrproper $(mrproper-dirs)
1337         $(call cmd,rmdirs)
1338         $(call cmd,rmfiles)
1339 
1340 # distclean
1341 #
1342 PHONY += distclean
1343 
1344 distclean: mrproper
1345         @find $(srctree) $(RCS_FIND_IGNORE) \
1346                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1347                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1348                 -o -name 'core' \) \
1349                 -type f -print | xargs rm -f
1350 
1351 
1352 # Packaging of the kernel to various formats
1353 # ---------------------------------------------------------------------------
1354 # rpm target kept for backward compatibility
1355 package-dir     := scripts/package
1356 
1357 %src-pkg: FORCE
1358         $(Q)$(MAKE) $(build)=$(package-dir) $@
1359 %pkg: include/config/kernel.release FORCE
1360         $(Q)$(MAKE) $(build)=$(package-dir) $@
1361 rpm: rpm-pkg
1362         @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1363         @echo "           Please use \"rpm-pkg\" instead."
1364 
1365 
1366 # Brief documentation of the typical targets used
1367 # ---------------------------------------------------------------------------
1368 
1369 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1370 boards := $(sort $(notdir $(boards)))
1371 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1372 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1373 
1374 PHONY += help
1375 help:
1376         @echo  'Cleaning targets:'
1377         @echo  '  clean           - Remove most generated files but keep the config and'
1378         @echo  '                    enough build support to build external modules'
1379         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1380         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1381         @echo  ''
1382         @echo  'Configuration targets:'
1383         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1384         @echo  ''
1385         @echo  'Other generic targets:'
1386         @echo  '  all             - Build all targets marked with [*]'
1387         @echo  '* vmlinux         - Build the bare kernel'
1388         @echo  '* modules         - Build all modules'
1389         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1390         @echo  '  dir/            - Build all files in dir and below'
1391         @echo  '  dir/file.[ois]  - Build specified target only'
1392         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1393         @echo  '                    (requires compiler support for LLVM assembly generation)'
1394         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1395         @echo  '                    (requires a recent binutils and recent build (System.map))'
1396         @echo  '  dir/file.ko     - Build module including final link'
1397         @echo  '  modules_prepare - Set up for building external modules'
1398         @echo  '  tags/TAGS       - Generate tags file for editors'
1399         @echo  '  cscope          - Generate cscope index'
1400         @echo  '  gtags           - Generate GNU GLOBAL index'
1401         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1402         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1403         @echo  '  image_name      - Output the image name (use with make -s)'
1404         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1405          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1406          echo  ''
1407         @echo  'Static analysers:'
1408         @echo  '  checkstack      - Generate a list of stack hogs'
1409         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1410         @echo  '  versioncheck    - Sanity check on version.h usage'
1411         @echo  '  includecheck    - Check for duplicate included header files'
1412         @echo  '  export_report   - List the usages of all exported symbols'
1413         @echo  '  headers_check   - Sanity check on exported headers'
1414         @echo  '  headerdep       - Detect inclusion cycles in headers'
1415         @echo  '  coccicheck      - Check with Coccinelle'
1416         @echo  ''
1417         @echo  'Kernel selftest:'
1418         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1419         @echo  '                    Build, install, and boot kernel before'
1420         @echo  '                    running kselftest on it'
1421         @echo  '  kselftest-clean - Remove all generated kselftest files'
1422         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1423         @echo  '                    .config.'
1424         @echo  ''
1425         @echo 'Userspace tools targets:'
1426         @echo '  use "make tools/help"'
1427         @echo '  or  "cd tools; make help"'
1428         @echo  ''
1429         @echo  'Kernel packaging:'
1430         @$(MAKE) $(build)=$(package-dir) help
1431         @echo  ''
1432         @echo  'Documentation targets:'
1433         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1434         @echo  ''
1435         @echo  'Architecture specific targets ($(SRCARCH)):'
1436         @$(if $(archhelp),$(archhelp),\
1437                 echo '  No architecture specific help defined for $(SRCARCH)')
1438         @echo  ''
1439         @$(if $(boards), \
1440                 $(foreach b, $(boards), \
1441                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1442                 echo '')
1443         @$(if $(board-dirs), \
1444                 $(foreach b, $(board-dirs), \
1445                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1446                 printf "  %-16s - Show all of the above\\n" help-boards; \
1447                 echo '')
1448 
1449         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1450         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1451         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1452         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1453         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1454         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1455         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1456         @echo  '                1: warnings which may be relevant and do not occur too often'
1457         @echo  '                2: warnings which occur quite often but may still be relevant'
1458         @echo  '                3: more obscure warnings, can most likely be ignored'
1459         @echo  '                Multiple levels can be combined with W=12 or W=123'
1460         @echo  ''
1461         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1462         @echo  'For further info see the ./README file'
1463 
1464 
1465 help-board-dirs := $(addprefix help-,$(board-dirs))
1466 
1467 help-boards: $(help-board-dirs)
1468 
1469 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1470 
1471 $(help-board-dirs): help-%:
1472         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1473         @$(if $(boards-per-dir), \
1474                 $(foreach b, $(boards-per-dir), \
1475                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1476                 echo '')
1477 
1478 
1479 # Documentation targets
1480 # ---------------------------------------------------------------------------
1481 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1482                linkcheckdocs dochelp refcheckdocs
1483 PHONY += $(DOC_TARGETS)
1484 $(DOC_TARGETS): scripts_basic FORCE
1485         $(Q)$(MAKE) $(build)=Documentation $@
1486 
1487 else # KBUILD_EXTMOD
1488 
1489 ###
1490 # External module support.
1491 # When building external modules the kernel used as basis is considered
1492 # read-only, and no consistency checks are made and the make
1493 # system is not used on the basis kernel. If updates are required
1494 # in the basis kernel ordinary make commands (without M=...) must
1495 # be used.
1496 #
1497 # The following are the only valid targets when building external
1498 # modules.
1499 # make M=dir clean     Delete all automatically generated files
1500 # make M=dir modules   Make all modules in specified dir
1501 # make M=dir           Same as 'make M=dir modules'
1502 # make M=dir modules_install
1503 #                      Install the modules built in the module directory
1504 #                      Assumes install directory is already created
1505 
1506 # We are always building modules
1507 KBUILD_MODULES := 1
1508 PHONY += crmodverdir
1509 crmodverdir:
1510         $(cmd_crmodverdir)
1511 
1512 PHONY += $(objtree)/Module.symvers
1513 $(objtree)/Module.symvers:
1514         @test -e $(objtree)/Module.symvers || ( \
1515         echo; \
1516         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1517         echo "           is missing; modules will have no dependencies and modversions."; \
1518         echo )
1519 
1520 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1521 PHONY += $(module-dirs) modules
1522 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1523         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1524 
1525 modules: $(module-dirs)
1526         @$(kecho) '  Building modules, stage 2.';
1527         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1528 
1529 PHONY += modules_install
1530 modules_install: _emodinst_ _emodinst_post
1531 
1532 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1533 PHONY += _emodinst_
1534 _emodinst_:
1535         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1536         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1537 
1538 PHONY += _emodinst_post
1539 _emodinst_post: _emodinst_
1540         $(call cmd,depmod)
1541 
1542 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1543 
1544 PHONY += $(clean-dirs) clean
1545 $(clean-dirs):
1546         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1547 
1548 clean:  rm-dirs := $(MODVERDIR)
1549 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1550 
1551 PHONY += help
1552 help:
1553         @echo  '  Building external modules.'
1554         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1555         @echo  ''
1556         @echo  '  modules         - default target, build the module(s)'
1557         @echo  '  modules_install - install the module'
1558         @echo  '  clean           - remove generated files in module directory only'
1559         @echo  ''
1560 
1561 # Dummies...
1562 PHONY += prepare scripts
1563 prepare: ;
1564 scripts: ;
1565 endif # KBUILD_EXTMOD
1566 
1567 clean: $(clean-dirs)
1568         $(call cmd,rmdirs)
1569         $(call cmd,rmfiles)
1570         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1571                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1572                 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1573                 -o -name '*.dwo' -o -name '*.lst' \
1574                 -o -name '*.su'  \
1575                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1576                 -o -name '*.symtypes' -o -name 'modules.order' \
1577                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1578                 -o -name .cache.mk \
1579                 -o -name '*.c.[012]*.*' \
1580                 -o -name '*.ll' \
1581                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1582 
1583 # Generate tags for editors
1584 # ---------------------------------------------------------------------------
1585 quiet_cmd_tags = GEN     $@
1586       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1587 
1588 tags TAGS cscope gtags: FORCE
1589         $(call cmd,tags)
1590 
1591 # Scripts to check various things for consistency
1592 # ---------------------------------------------------------------------------
1593 
1594 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1595 
1596 includecheck:
1597         find $(srctree)/* $(RCS_FIND_IGNORE) \
1598                 -name '*.[hcS]' -type f -print | sort \
1599                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1600 
1601 versioncheck:
1602         find $(srctree)/* $(RCS_FIND_IGNORE) \
1603                 -name '*.[hcS]' -type f -print | sort \
1604                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1605 
1606 coccicheck:
1607         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1608 
1609 namespacecheck:
1610         $(PERL) $(srctree)/scripts/namespace.pl
1611 
1612 export_report:
1613         $(PERL) $(srctree)/scripts/export_report.pl
1614 
1615 endif #ifeq ($(config-targets),1)
1616 endif #ifeq ($(mixed-targets),1)
1617 
1618 PHONY += checkstack kernelrelease kernelversion image_name
1619 
1620 # UML needs a little special treatment here.  It wants to use the host
1621 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1622 # else wants $(ARCH), including people doing cross-builds, which means
1623 # that $(SUBARCH) doesn't work here.
1624 ifeq ($(ARCH), um)
1625 CHECKSTACK_ARCH := $(SUBARCH)
1626 else
1627 CHECKSTACK_ARCH := $(ARCH)
1628 endif
1629 checkstack:
1630         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1631         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1632 
1633 kernelrelease:
1634         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1635 
1636 kernelversion:
1637         @echo $(KERNELVERSION)
1638 
1639 image_name:
1640         @echo $(KBUILD_IMAGE)
1641 
1642 # Clear a bunch of variables before executing the submake
1643 tools/: FORCE
1644         $(Q)mkdir -p $(objtree)/tools
1645         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1646 
1647 tools/%: FORCE
1648         $(Q)mkdir -p $(objtree)/tools
1649         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1650 
1651 # Single targets
1652 # ---------------------------------------------------------------------------
1653 # Single targets are compatible with:
1654 # - build with mixed source and output
1655 # - build with separate output dir 'make O=...'
1656 # - external modules
1657 #
1658 #  target-dir => where to store outputfile
1659 #  build-dir  => directory in kernel source tree to use
1660 
1661 ifeq ($(KBUILD_EXTMOD),)
1662         build-dir  = $(patsubst %/,%,$(dir $@))
1663         target-dir = $(dir $@)
1664 else
1665         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1666         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1667         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1668 endif
1669 
1670 %.s: %.c prepare scripts FORCE
1671         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1672 %.i: %.c prepare scripts FORCE
1673         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1674 %.o: %.c prepare scripts FORCE
1675         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1676 %.lst: %.c prepare scripts FORCE
1677         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1678 %.s: %.S prepare scripts FORCE
1679         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1680 %.o: %.S prepare scripts FORCE
1681         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1682 %.symtypes: %.c prepare scripts FORCE
1683         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1684 %.ll: %.c prepare scripts FORCE
1685         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1686 
1687 # Modules
1688 /: prepare scripts FORCE
1689         $(cmd_crmodverdir)
1690         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1691         $(build)=$(build-dir)
1692 # Make sure the latest headers are built for Documentation
1693 Documentation/ samples/: headers_install
1694 %/: prepare scripts FORCE
1695         $(cmd_crmodverdir)
1696         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1697         $(build)=$(build-dir)
1698 %.ko: prepare scripts FORCE
1699         $(cmd_crmodverdir)
1700         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1701         $(build)=$(build-dir) $(@:.ko=.o)
1702         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1703 
1704 # FIXME Should go into a make.lib or something
1705 # ===========================================================================
1706 
1707 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1708       cmd_rmdirs = rm -rf $(rm-dirs)
1709 
1710 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1711       cmd_rmfiles = rm -f $(rm-files)
1712 
1713 # Run depmod only if we have System.map and depmod is executable
1714 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1715       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1716                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1717 
1718 # Create temporary dir for module support files
1719 # clean it up only when building all modules
1720 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1721                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1722 
1723 # read all saved command lines
1724 
1725 cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1726 
1727 ifneq ($(cmd_files),)
1728   $(cmd_files): ;       # Do not try to update included dependency files
1729   include $(cmd_files)
1730 endif
1731 
1732 endif   # skip-makefile
1733 
1734 PHONY += FORCE
1735 FORCE:
1736 
1737 # Declare the contents of the .PHONY variable as phony.  We keep that
1738 # information in a variable so we can use it in if_changed and friends.
1739 .PHONY: $(PHONY)

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