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1 VERSION = 3
2 PATCHLEVEL = 17
3 SUBLEVEL = 0
4 EXTRAVERSION = -rc1
5 NAME = Shuffling Zombie Juror
6
7 # *DOCUMENTATION*
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
12
13 # Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 MAKEFLAGS += -rR
16
17 # Avoid funny character set dependencies
18 unexport LC_ALL
19 LC_COLLATE=C
20 LC_NUMERIC=C
21 export LC_COLLATE LC_NUMERIC
22
23 # Avoid interference with shell env settings
24 unexport GREP_OPTIONS
25
26 # We are using a recursive build, so we need to do a little thinking
27 # to get the ordering right.
28 #
29 # Most importantly: sub-Makefiles should only ever modify files in
30 # their own directory. If in some directory we have a dependency on
31 # a file in another dir (which doesn't happen often, but it's often
32 # unavoidable when linking the built-in.o targets which finally
33 # turn into vmlinux), we will call a sub make in that other dir, and
34 # after that we are sure that everything which is in that other dir
35 # is now up to date.
36 #
37 # The only cases where we need to modify files which have global
38 # effects are thus separated out and done before the recursive
39 # descending is started. They are now explicitly listed as the
40 # prepare rule.
41
42 # Beautify output
43 # ---------------------------------------------------------------------------
44 #
45 # Normally, we echo the whole command before executing it. By making
46 # that echo $($(quiet)$(cmd)), we now have the possibility to set
47 # $(quiet) to choose other forms of output instead, e.g.
48 #
49 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
51 #
52 # If $(quiet) is empty, the whole command will be printed.
53 # If it is set to "quiet_", only the short version will be printed.
54 # If it is set to "silent_", nothing will be printed at all, since
55 # the variable $(silent_cmd_cc_o_c) doesn't exist.
56 #
57 # A simple variant is to prefix commands with $(Q) - that's useful
58 # for commands that shall be hidden in non-verbose mode.
59 #
60 # $(Q)ln $@ :<
61 #
62 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
64 #
65 # To put more focus on warnings, be less verbose as default
66 # Use 'make V=1' to see the full commands
67
68 ifeq ("$(origin V)", "command line")
69 KBUILD_VERBOSE = $(V)
70 endif
71 ifndef KBUILD_VERBOSE
72 KBUILD_VERBOSE = 0
73 endif
74
75 ifeq ($(KBUILD_VERBOSE),1)
76 quiet =
77 Q =
78 else
79 quiet=quiet_
80 Q = @
81 endif
82
83 # If the user is running make -s (silent mode), suppress echoing of
84 # commands
85
86 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
87 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88 quiet=silent_
89 endif
90 else # make-3.8x
91 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92 quiet=silent_
93 endif
94 endif
95
96 export quiet Q KBUILD_VERBOSE
97
98 # Call a source code checker (by default, "sparse") as part of the
99 # C compilation.
100 #
101 # Use 'make C=1' to enable checking of only re-compiled files.
102 # Use 'make C=2' to enable checking of *all* source files, regardless
103 # of whether they are re-compiled or not.
104 #
105 # See the file "Documentation/sparse.txt" for more details, including
106 # where to get the "sparse" utility.
107
108 ifeq ("$(origin C)", "command line")
109 KBUILD_CHECKSRC = $(C)
110 endif
111 ifndef KBUILD_CHECKSRC
112 KBUILD_CHECKSRC = 0
113 endif
114
115 # Use make M=dir to specify directory of external module to build
116 # Old syntax make ... SUBDIRS=$PWD is still supported
117 # Setting the environment variable KBUILD_EXTMOD take precedence
118 ifdef SUBDIRS
119 KBUILD_EXTMOD ?= $(SUBDIRS)
120 endif
121
122 ifeq ("$(origin M)", "command line")
123 KBUILD_EXTMOD := $(M)
124 endif
125
126 # kbuild supports saving output files in a separate directory.
127 # To locate output files in a separate directory two syntaxes are supported.
128 # In both cases the working directory must be the root of the kernel src.
129 # 1) O=
130 # Use "make O=dir/to/store/output/files/"
131 #
132 # 2) Set KBUILD_OUTPUT
133 # Set the environment variable KBUILD_OUTPUT to point to the directory
134 # where the output files shall be placed.
135 # export KBUILD_OUTPUT=dir/to/store/output/files/
136 # make
137 #
138 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
139 # variable.
140
141
142 # KBUILD_SRC is set on invocation of make in OBJ directory
143 # KBUILD_SRC is not intended to be used by the regular user (for now)
144 ifeq ($(KBUILD_SRC),)
145
146 # OK, Make called in directory where kernel src resides
147 # Do we want to locate output files in a separate directory?
148 ifeq ("$(origin O)", "command line")
149 KBUILD_OUTPUT := $(O)
150 endif
151
152 # That's our default target when none is given on the command line
153 PHONY := _all
154 _all:
155
156 # Cancel implicit rules on top Makefile
157 $(CURDIR)/Makefile Makefile: ;
158
159 ifneq ($(KBUILD_OUTPUT),)
160 # Invoke a second make in the output directory, passing relevant variables
161 # check that the output directory actually exists
162 saved-output := $(KBUILD_OUTPUT)
163 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
164 && /bin/pwd)
165 $(if $(KBUILD_OUTPUT),, \
166 $(error failed to create output directory "$(saved-output)"))
167
168 PHONY += $(MAKECMDGOALS) sub-make
169
170 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
171 @:
172
173 sub-make: FORCE
174 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
175 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
176 $(filter-out _all sub-make,$(MAKECMDGOALS))
177
178 # Leave processing to above invocation of make
179 skip-makefile := 1
180 endif # ifneq ($(KBUILD_OUTPUT),)
181 endif # ifeq ($(KBUILD_SRC),)
182
183 # We process the rest of the Makefile if this is the final invocation of make
184 ifeq ($(skip-makefile),)
185
186 # Do not print "Entering directory ...",
187 # but we want to display it when entering to the output directory
188 # so that IDEs/editors are able to understand relative filenames.
189 MAKEFLAGS += --no-print-directory
190
191 # If building an external module we do not care about the all: rule
192 # but instead _all depend on modules
193 PHONY += all
194 ifeq ($(KBUILD_EXTMOD),)
195 _all: all
196 else
197 _all: modules
198 endif
199
200 ifeq ($(KBUILD_SRC),)
201 # building in the source tree
202 srctree := .
203 else
204 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
205 # building in a subdirectory of the source tree
206 srctree := ..
207 else
208 srctree := $(KBUILD_SRC)
209 endif
210 endif
211 objtree := .
212 src := $(srctree)
213 obj := $(objtree)
214
215 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
216
217 export srctree objtree VPATH
218
219
220 # SUBARCH tells the usermode build what the underlying arch is. That is set
221 # first, and if a usermode build is happening, the "ARCH=um" on the command
222 # line overrides the setting of ARCH below. If a native build is happening,
223 # then ARCH is assigned, getting whatever value it gets normally, and
224 # SUBARCH is subsequently ignored.
225
226 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
227 -e s/sun4u/sparc64/ \
228 -e s/arm.*/arm/ -e s/sa110/arm/ \
229 -e s/s390x/s390/ -e s/parisc64/parisc/ \
230 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
231 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
232
233 # Cross compiling and selecting different set of gcc/bin-utils
234 # ---------------------------------------------------------------------------
235 #
236 # When performing cross compilation for other architectures ARCH shall be set
237 # to the target architecture. (See arch/* for the possibilities).
238 # ARCH can be set during invocation of make:
239 # make ARCH=ia64
240 # Another way is to have ARCH set in the environment.
241 # The default ARCH is the host where make is executed.
242
243 # CROSS_COMPILE specify the prefix used for all executables used
244 # during compilation. Only gcc and related bin-utils executables
245 # are prefixed with $(CROSS_COMPILE).
246 # CROSS_COMPILE can be set on the command line
247 # make CROSS_COMPILE=ia64-linux-
248 # Alternatively CROSS_COMPILE can be set in the environment.
249 # A third alternative is to store a setting in .config so that plain
250 # "make" in the configured kernel build directory always uses that.
251 # Default value for CROSS_COMPILE is not to prefix executables
252 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
253 ARCH ?= $(SUBARCH)
254 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
255
256 # Architecture as present in compile.h
257 UTS_MACHINE := $(ARCH)
258 SRCARCH := $(ARCH)
259
260 # Additional ARCH settings for x86
261 ifeq ($(ARCH),i386)
262 SRCARCH := x86
263 endif
264 ifeq ($(ARCH),x86_64)
265 SRCARCH := x86
266 endif
267
268 # Additional ARCH settings for sparc
269 ifeq ($(ARCH),sparc32)
270 SRCARCH := sparc
271 endif
272 ifeq ($(ARCH),sparc64)
273 SRCARCH := sparc
274 endif
275
276 # Additional ARCH settings for sh
277 ifeq ($(ARCH),sh64)
278 SRCARCH := sh
279 endif
280
281 # Additional ARCH settings for tile
282 ifeq ($(ARCH),tilepro)
283 SRCARCH := tile
284 endif
285 ifeq ($(ARCH),tilegx)
286 SRCARCH := tile
287 endif
288
289 # Where to locate arch specific headers
290 hdr-arch := $(SRCARCH)
291
292 KCONFIG_CONFIG ?= .config
293 export KCONFIG_CONFIG
294
295 # SHELL used by kbuild
296 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
297 else if [ -x /bin/bash ]; then echo /bin/bash; \
298 else echo sh; fi ; fi)
299
300 HOSTCC = gcc
301 HOSTCXX = g++
302 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
303 HOSTCXXFLAGS = -O2
304
305 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
306 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
307 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
308 endif
309
310 # Decide whether to build built-in, modular, or both.
311 # Normally, just do built-in.
312
313 KBUILD_MODULES :=
314 KBUILD_BUILTIN := 1
315
316 # If we have only "make modules", don't compile built-in objects.
317 # When we're building modules with modversions, we need to consider
318 # the built-in objects during the descend as well, in order to
319 # make sure the checksums are up to date before we record them.
320
321 ifeq ($(MAKECMDGOALS),modules)
322 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
323 endif
324
325 # If we have "make <whatever> modules", compile modules
326 # in addition to whatever we do anyway.
327 # Just "make" or "make all" shall build modules as well
328
329 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
330 KBUILD_MODULES := 1
331 endif
332
333 ifeq ($(MAKECMDGOALS),)
334 KBUILD_MODULES := 1
335 endif
336
337 export KBUILD_MODULES KBUILD_BUILTIN
338 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
339
340 ifneq ($(CC),)
341 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
342 COMPILER := clang
343 else
344 COMPILER := gcc
345 endif
346 export COMPILER
347 endif
348
349 # Look for make include files relative to root of kernel src
350 MAKEFLAGS += --include-dir=$(srctree)
351
352 # We need some generic definitions (do not try to remake the file).
353 $(srctree)/scripts/Kbuild.include: ;
354 include $(srctree)/scripts/Kbuild.include
355
356 # Make variables (CC, etc...)
357 AS = $(CROSS_COMPILE)as
358 LD = $(CROSS_COMPILE)ld
359 CC = $(CROSS_COMPILE)gcc
360 CPP = $(CC) -E
361 AR = $(CROSS_COMPILE)ar
362 NM = $(CROSS_COMPILE)nm
363 STRIP = $(CROSS_COMPILE)strip
364 OBJCOPY = $(CROSS_COMPILE)objcopy
365 OBJDUMP = $(CROSS_COMPILE)objdump
366 AWK = awk
367 GENKSYMS = scripts/genksyms/genksyms
368 INSTALLKERNEL := installkernel
369 DEPMOD = /sbin/depmod
370 PERL = perl
371 PYTHON = python
372 CHECK = sparse
373
374 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
375 -Wbitwise -Wno-return-void $(CF)
376 CFLAGS_MODULE =
377 AFLAGS_MODULE =
378 LDFLAGS_MODULE =
379 CFLAGS_KERNEL =
380 AFLAGS_KERNEL =
381 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
382
383
384 # Use USERINCLUDE when you must reference the UAPI directories only.
385 USERINCLUDE := \
386 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
387 -Iarch/$(hdr-arch)/include/generated/uapi \
388 -I$(srctree)/include/uapi \
389 -Iinclude/generated/uapi \
390 -include $(srctree)/include/linux/kconfig.h
391
392 # Use LINUXINCLUDE when you must reference the include/ directory.
393 # Needed to be compatible with the O= option
394 LINUXINCLUDE := \
395 -I$(srctree)/arch/$(hdr-arch)/include \
396 -Iarch/$(hdr-arch)/include/generated \
397 $(if $(KBUILD_SRC), -I$(srctree)/include) \
398 -Iinclude \
399 $(USERINCLUDE)
400
401 KBUILD_CPPFLAGS := -D__KERNEL__
402
403 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
404 -fno-strict-aliasing -fno-common \
405 -Werror-implicit-function-declaration \
406 -Wno-format-security
407
408 KBUILD_AFLAGS_KERNEL :=
409 KBUILD_CFLAGS_KERNEL :=
410 KBUILD_AFLAGS := -D__ASSEMBLY__
411 KBUILD_AFLAGS_MODULE := -DMODULE
412 KBUILD_CFLAGS_MODULE := -DMODULE
413 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
414
415 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
416 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
417 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
418
419 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
420 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
421 export CPP AR NM STRIP OBJCOPY OBJDUMP
422 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
423 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
424
425 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
426 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
427 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
428 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
429 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
430 export KBUILD_ARFLAGS
431
432 # When compiling out-of-tree modules, put MODVERDIR in the module
433 # tree rather than in the kernel tree. The kernel tree might
434 # even be read-only.
435 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
436
437 # Files to ignore in find ... statements
438
439 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
440 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
441 -prune -o
442 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
443 --exclude CVS --exclude .pc --exclude .hg --exclude .git
444
445 # ===========================================================================
446 # Rules shared between *config targets and build targets
447
448 # Basic helpers built in scripts/
449 PHONY += scripts_basic
450 scripts_basic:
451 $(Q)$(MAKE) $(build)=scripts/basic
452 $(Q)rm -f .tmp_quiet_recordmcount
453
454 # To avoid any implicit rule to kick in, define an empty command.
455 scripts/basic/%: scripts_basic ;
456
457 PHONY += outputmakefile
458 # outputmakefile generates a Makefile in the output directory, if using a
459 # separate output directory. This allows convenient use of make in the
460 # output directory.
461 outputmakefile:
462 ifneq ($(KBUILD_SRC),)
463 $(Q)ln -fsn $(srctree) source
464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
465 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466 endif
467
468 # Support for using generic headers in asm-generic
469 PHONY += asm-generic
470 asm-generic:
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=asm obj=arch/$(SRCARCH)/include/generated/asm
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
475
476 # To make sure we do not include .config for any of the *config targets
477 # catch them early, and hand them over to scripts/kconfig/Makefile
478 # It is allowed to specify more targets when calling make, including
479 # mixing *config targets and build targets.
480 # For example 'make oldconfig all'.
481 # Detect when mixed targets is specified, and make a second invocation
482 # of make so .config is not included in this case either (for *config).
483
484 version_h := include/generated/uapi/linux/version.h
485
486 no-dot-config-targets := clean mrproper distclean \
487 cscope gtags TAGS tags help %docs check% coccicheck \
488 $(version_h) headers_% archheaders archscripts \
489 kernelversion %src-pkg
490
491 config-targets := 0
492 mixed-targets := 0
493 dot-config := 1
494
495 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 dot-config := 0
498 endif
499 endif
500
501 ifeq ($(KBUILD_EXTMOD),)
502 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
503 config-targets := 1
504 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
505 mixed-targets := 1
506 endif
507 endif
508 endif
509
510 ifeq ($(mixed-targets),1)
511 # ===========================================================================
512 # We're called with mixed targets (*config and build targets).
513 # Handle them one by one.
514
515 PHONY += $(MAKECMDGOALS) __build_one_by_one
516
517 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
518 @:
519
520 __build_one_by_one:
521 $(Q)set -e; \
522 for i in $(MAKECMDGOALS); do \
523 $(MAKE) -f $(srctree)/Makefile $$i; \
524 done
525
526 else
527 ifeq ($(config-targets),1)
528 # ===========================================================================
529 # *config targets only - make sure prerequisites are updated, and descend
530 # in scripts/kconfig to make the *config target
531
532 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
533 # KBUILD_DEFCONFIG may point out an alternative default configuration
534 # used for 'make defconfig'
535 include $(srctree)/arch/$(SRCARCH)/Makefile
536 export KBUILD_DEFCONFIG KBUILD_KCONFIG
537
538 config: scripts_basic outputmakefile FORCE
539 $(Q)$(MAKE) $(build)=scripts/kconfig $@
540
541 %config: scripts_basic outputmakefile FORCE
542 $(Q)$(MAKE) $(build)=scripts/kconfig $@
543
544 else
545 # ===========================================================================
546 # Build targets only - this includes vmlinux, arch specific targets, clean
547 # targets and others. In general all targets except *config targets.
548
549 ifeq ($(KBUILD_EXTMOD),)
550 # Additional helpers built in scripts/
551 # Carefully list dependencies so we do not try to build scripts twice
552 # in parallel
553 PHONY += scripts
554 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
555 asm-generic
556 $(Q)$(MAKE) $(build)=$(@)
557
558 # Objects we will link into vmlinux / subdirs we need to visit
559 init-y := init/
560 drivers-y := drivers/ sound/ firmware/
561 net-y := net/
562 libs-y := lib/
563 core-y := usr/
564 endif # KBUILD_EXTMOD
565
566 ifeq ($(dot-config),1)
567 # Read in config
568 -include include/config/auto.conf
569
570 ifeq ($(KBUILD_EXTMOD),)
571 # Read in dependencies to all Kconfig* files, make sure to run
572 # oldconfig if changes are detected.
573 -include include/config/auto.conf.cmd
574
575 # To avoid any implicit rule to kick in, define an empty command
576 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
577
578 # If .config is newer than include/config/auto.conf, someone tinkered
579 # with it and forgot to run make oldconfig.
580 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
581 # we execute the config step to be sure to catch updated Kconfig files
582 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
583 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
584 else
585 # external modules needs include/generated/autoconf.h and include/config/auto.conf
586 # but do not care if they are up-to-date. Use auto.conf to trigger the test
587 PHONY += include/config/auto.conf
588
589 include/config/auto.conf:
590 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
591 echo >&2; \
592 echo >&2 " ERROR: Kernel configuration is invalid."; \
593 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
594 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
595 echo >&2 ; \
596 /bin/false)
597
598 endif # KBUILD_EXTMOD
599
600 else
601 # Dummy target needed, because used as prerequisite
602 include/config/auto.conf: ;
603 endif # $(dot-config)
604
605 # The all: target is the default when no target is given on the
606 # command line.
607 # This allow a user to issue only 'make' to build a kernel including modules
608 # Defaults to vmlinux, but the arch makefile usually adds further targets
609 all: vmlinux
610
611 include $(srctree)/arch/$(SRCARCH)/Makefile
612
613 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
614
615 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
616 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
617 else
618 KBUILD_CFLAGS += -O2
619 endif
620
621 # Tell gcc to never replace conditional load with a non-conditional one
622 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
623
624 ifdef CONFIG_READABLE_ASM
625 # Disable optimizations that make assembler listings hard to read.
626 # reorder blocks reorders the control in the function
627 # ipa clone creates specialized cloned functions
628 # partial inlining inlines only parts of functions
629 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
630 $(call cc-option,-fno-ipa-cp-clone,) \
631 $(call cc-option,-fno-partial-inlining)
632 endif
633
634 ifneq ($(CONFIG_FRAME_WARN),0)
635 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
636 endif
637
638 # Handle stack protector mode.
639 #
640 # Since kbuild can potentially perform two passes (first with the old
641 # .config values and then with updated .config values), we cannot error out
642 # if a desired compiler option is unsupported. If we were to error, kbuild
643 # could never get to the second pass and actually notice that we changed
644 # the option to something that was supported.
645 #
646 # Additionally, we don't want to fallback and/or silently change which compiler
647 # flags will be used, since that leads to producing kernels with different
648 # security feature characteristics depending on the compiler used. ("But I
649 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
650 #
651 # The middle ground is to warn here so that the failed option is obvious, but
652 # to let the build fail with bad compiler flags so that we can't produce a
653 # kernel when there is a CONFIG and compiler mismatch.
654 #
655 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
656 stackp-flag := -fstack-protector
657 ifeq ($(call cc-option, $(stackp-flag)),)
658 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
659 -fstack-protector not supported by compiler)
660 endif
661 else
662 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
663 stackp-flag := -fstack-protector-strong
664 ifeq ($(call cc-option, $(stackp-flag)),)
665 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
666 -fstack-protector-strong not supported by compiler)
667 endif
668 else
669 # Force off for distro compilers that enable stack protector by default.
670 stackp-flag := $(call cc-option, -fno-stack-protector)
671 endif
672 endif
673 KBUILD_CFLAGS += $(stackp-flag)
674
675 ifeq ($(COMPILER),clang)
676 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
677 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
678 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
679 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
680 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
681 # Quiet clang warning: comparison of unsigned expression < 0 is always false
682 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
683 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
684 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
685 # See modpost pattern 2
686 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
687 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
688 else
689
690 # This warning generated too much noise in a regular build.
691 # Use make W=1 to enable this warning (see scripts/Makefile.build)
692 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
693 endif
694
695 ifdef CONFIG_FRAME_POINTER
696 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
697 else
698 # Some targets (ARM with Thumb2, for example), can't be built with frame
699 # pointers. For those, we don't have FUNCTION_TRACER automatically
700 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
701 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
702 # -fomit-frame-pointer with FUNCTION_TRACER.
703 ifndef CONFIG_FUNCTION_TRACER
704 KBUILD_CFLAGS += -fomit-frame-pointer
705 endif
706 endif
707
708 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
709
710 ifdef CONFIG_DEBUG_INFO
711 ifdef CONFIG_DEBUG_INFO_SPLIT
712 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
713 else
714 KBUILD_CFLAGS += -g
715 endif
716 KBUILD_AFLAGS += -Wa,-gdwarf-2
717 endif
718 ifdef CONFIG_DEBUG_INFO_DWARF4
719 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
720 endif
721
722 ifdef CONFIG_DEBUG_INFO_REDUCED
723 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
724 $(call cc-option,-fno-var-tracking)
725 endif
726
727 ifdef CONFIG_FUNCTION_TRACER
728 ifdef CONFIG_HAVE_FENTRY
729 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
730 endif
731 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
732 KBUILD_AFLAGS += $(CC_USING_FENTRY)
733 ifdef CONFIG_DYNAMIC_FTRACE
734 ifdef CONFIG_HAVE_C_RECORDMCOUNT
735 BUILD_C_RECORDMCOUNT := y
736 export BUILD_C_RECORDMCOUNT
737 endif
738 endif
739 endif
740
741 # We trigger additional mismatches with less inlining
742 ifdef CONFIG_DEBUG_SECTION_MISMATCH
743 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
744 endif
745
746 # arch Makefile may override CC so keep this after arch Makefile is included
747 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
748 CHECKFLAGS += $(NOSTDINC_FLAGS)
749
750 # warn about C99 declaration after statement
751 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
752
753 # disable pointer signed / unsigned warnings in gcc 4.0
754 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
755
756 # disable invalid "can't wrap" optimizations for signed / pointers
757 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
758
759 # conserve stack if available
760 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
761
762 # disallow errors like 'EXPORT_GPL(foo);' with missing header
763 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
764
765 # require functions to have arguments in prototypes, not empty 'int foo()'
766 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
767
768 # Prohibit date/time macros, which would make the build non-deterministic
769 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
770
771 # use the deterministic mode of AR if available
772 KBUILD_ARFLAGS := $(call ar-option,D)
773
774 # check for 'asm goto'
775 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
776 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
777 endif
778
779 include $(srctree)/scripts/Makefile.extrawarn
780
781 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
782 KBUILD_CPPFLAGS += $(KCPPFLAGS)
783 KBUILD_AFLAGS += $(KAFLAGS)
784 KBUILD_CFLAGS += $(KCFLAGS)
785
786 # Use --build-id when available.
787 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
788 $(call cc-ldoption, -Wl$(comma)--build-id,))
789 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
790 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
791
792 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
793 LDFLAGS_vmlinux += $(call ld-option, -X,)
794 endif
795
796 # Default kernel image to build when no specific target is given.
797 # KBUILD_IMAGE may be overruled on the command line or
798 # set in the environment
799 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
800 # this default value
801 export KBUILD_IMAGE ?= vmlinux
802
803 #
804 # INSTALL_PATH specifies where to place the updated kernel and system map
805 # images. Default is /boot, but you can set it to other values
806 export INSTALL_PATH ?= /boot
807
808 #
809 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
810 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
811 # an argument if needed. Otherwise it defaults to the kernel install path
812 #
813 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
814
815 #
816 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
817 # relocations required by build roots. This is not defined in the
818 # makefile but the argument can be passed to make if needed.
819 #
820
821 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
822 export MODLIB
823
824 #
825 # INSTALL_MOD_STRIP, if defined, will cause modules to be
826 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
827 # the default option --strip-debug will be used. Otherwise,
828 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
829
830 ifdef INSTALL_MOD_STRIP
831 ifeq ($(INSTALL_MOD_STRIP),1)
832 mod_strip_cmd = $(STRIP) --strip-debug
833 else
834 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
835 endif # INSTALL_MOD_STRIP=1
836 else
837 mod_strip_cmd = true
838 endif # INSTALL_MOD_STRIP
839 export mod_strip_cmd
840
841 # Select initial ramdisk compression format, default is gzip(1).
842 # This shall be used by the dracut(8) tool while creating an initramfs image.
843 #
844 INITRD_COMPRESS-y := gzip
845 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
846 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
847 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
848 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
849 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
850 # do not export INITRD_COMPRESS, since we didn't actually
851 # choose a sane default compression above.
852 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
853
854 ifdef CONFIG_MODULE_SIG_ALL
855 MODSECKEY = ./signing_key.priv
856 MODPUBKEY = ./signing_key.x509
857 export MODPUBKEY
858 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
859 else
860 mod_sign_cmd = true
861 endif
862 export mod_sign_cmd
863
864
865 ifeq ($(KBUILD_EXTMOD),)
866 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
867
868 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
869 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
870 $(net-y) $(net-m) $(libs-y) $(libs-m)))
871
872 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
873 $(init-n) $(init-) \
874 $(core-n) $(core-) $(drivers-n) $(drivers-) \
875 $(net-n) $(net-) $(libs-n) $(libs-))))
876
877 init-y := $(patsubst %/, %/built-in.o, $(init-y))
878 core-y := $(patsubst %/, %/built-in.o, $(core-y))
879 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
880 net-y := $(patsubst %/, %/built-in.o, $(net-y))
881 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
882 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
883 libs-y := $(libs-y1) $(libs-y2)
884
885 # Externally visible symbols (used by link-vmlinux.sh)
886 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
887 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
888 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
889 export LDFLAGS_vmlinux
890 # used by scripts/pacmage/Makefile
891 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
892
893 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
894
895 # Final link of vmlinux
896 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
897 quiet_cmd_link-vmlinux = LINK $@
898
899 # Include targets which we want to
900 # execute if the rest of the kernel build went well.
901 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
902 ifdef CONFIG_HEADERS_CHECK
903 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
904 endif
905 ifdef CONFIG_SAMPLES
906 $(Q)$(MAKE) $(build)=samples
907 endif
908 ifdef CONFIG_BUILD_DOCSRC
909 $(Q)$(MAKE) $(build)=Documentation
910 endif
911 +$(call if_changed,link-vmlinux)
912
913 # The actual objects are generated when descending,
914 # make sure no implicit rule kicks in
915 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
916
917 # Handle descending into subdirectories listed in $(vmlinux-dirs)
918 # Preset locale variables to speed up the build process. Limit locale
919 # tweaks to this spot to avoid wrong language settings when running
920 # make menuconfig etc.
921 # Error messages still appears in the original language
922
923 PHONY += $(vmlinux-dirs)
924 $(vmlinux-dirs): prepare scripts
925 $(Q)$(MAKE) $(build)=$@
926
927 define filechk_kernel.release
928 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
929 endef
930
931 # Store (new) KERNELRELEASE string in include/config/kernel.release
932 include/config/kernel.release: include/config/auto.conf FORCE
933 $(call filechk,kernel.release)
934
935
936 # Things we need to do before we recursively start building the kernel
937 # or the modules are listed in "prepare".
938 # A multi level approach is used. prepareN is processed before prepareN-1.
939 # archprepare is used in arch Makefiles and when processed asm symlink,
940 # version.h and scripts_basic is processed / created.
941
942 # Listed in dependency order
943 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
944
945 # prepare3 is used to check if we are building in a separate output directory,
946 # and if so do:
947 # 1) Check that make has not been executed in the kernel src $(srctree)
948 prepare3: include/config/kernel.release
949 ifneq ($(KBUILD_SRC),)
950 @$(kecho) ' Using $(srctree) as source for kernel'
951 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
952 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
953 echo >&2 " in the '$(srctree)' directory.";\
954 /bin/false; \
955 fi;
956 endif
957
958 # prepare2 creates a makefile if using a separate output directory
959 prepare2: prepare3 outputmakefile asm-generic
960
961 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
962 include/config/auto.conf
963 $(cmd_crmodverdir)
964
965 archprepare: archheaders archscripts prepare1 scripts_basic
966
967 prepare0: archprepare FORCE
968 $(Q)$(MAKE) $(build)=.
969
970 # All the preparing..
971 prepare: prepare0
972
973 # Generate some files
974 # ---------------------------------------------------------------------------
975
976 # KERNELRELEASE can change from a few different places, meaning version.h
977 # needs to be updated, so this check is forced on all builds
978
979 uts_len := 64
980 define filechk_utsrelease.h
981 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
982 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
983 exit 1; \
984 fi; \
985 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
986 endef
987
988 define filechk_version.h
989 (echo \#define LINUX_VERSION_CODE $(shell \
990 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
991 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
992 endef
993
994 $(version_h): $(srctree)/Makefile FORCE
995 $(call filechk,version.h)
996
997 include/generated/utsrelease.h: include/config/kernel.release FORCE
998 $(call filechk,utsrelease.h)
999
1000 PHONY += headerdep
1001 headerdep:
1002 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1003 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1004
1005 # ---------------------------------------------------------------------------
1006
1007 PHONY += depend dep
1008 depend dep:
1009 @echo '*** Warning: make $@ is unnecessary now.'
1010
1011 # ---------------------------------------------------------------------------
1012 # Firmware install
1013 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1014 export INSTALL_FW_PATH
1015
1016 PHONY += firmware_install
1017 firmware_install: FORCE
1018 @mkdir -p $(objtree)/firmware
1019 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1020
1021 # ---------------------------------------------------------------------------
1022 # Kernel headers
1023
1024 #Default location for installed headers
1025 export INSTALL_HDR_PATH = $(objtree)/usr
1026
1027 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1028
1029 # If we do an all arch process set dst to asm-$(hdr-arch)
1030 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1031
1032 PHONY += archheaders
1033 archheaders:
1034
1035 PHONY += archscripts
1036 archscripts:
1037
1038 PHONY += __headers
1039 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1040 $(Q)$(MAKE) $(build)=scripts build_unifdef
1041
1042 PHONY += headers_install_all
1043 headers_install_all:
1044 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1045
1046 PHONY += headers_install
1047 headers_install: __headers
1048 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1049 $(error Headers not exportable for the $(SRCARCH) architecture))
1050 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1051 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1052
1053 PHONY += headers_check_all
1054 headers_check_all: headers_install_all
1055 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1056
1057 PHONY += headers_check
1058 headers_check: headers_install
1059 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1060 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1061
1062 # ---------------------------------------------------------------------------
1063 # Kernel selftest
1064
1065 PHONY += kselftest
1066 kselftest:
1067 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1068
1069 # ---------------------------------------------------------------------------
1070 # Modules
1071
1072 ifdef CONFIG_MODULES
1073
1074 # By default, build modules as well
1075
1076 all: modules
1077
1078 # Build modules
1079 #
1080 # A module can be listed more than once in obj-m resulting in
1081 # duplicate lines in modules.order files. Those are removed
1082 # using awk while concatenating to the final file.
1083
1084 PHONY += modules
1085 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1086 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1087 @$(kecho) ' Building modules, stage 2.';
1088 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1089 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1090
1091 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1092 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1093
1094 %/modules.builtin: include/config/auto.conf
1095 $(Q)$(MAKE) $(modbuiltin)=$*
1096
1097
1098 # Target to prepare building external modules
1099 PHONY += modules_prepare
1100 modules_prepare: prepare scripts
1101
1102 # Target to install modules
1103 PHONY += modules_install
1104 modules_install: _modinst_ _modinst_post
1105
1106 PHONY += _modinst_
1107 _modinst_:
1108 @rm -rf $(MODLIB)/kernel
1109 @rm -f $(MODLIB)/source
1110 @mkdir -p $(MODLIB)/kernel
1111 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1112 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1113 rm -f $(MODLIB)/build ; \
1114 ln -s $(CURDIR) $(MODLIB)/build ; \
1115 fi
1116 @cp -f $(objtree)/modules.order $(MODLIB)/
1117 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1118 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1119
1120 # This depmod is only for convenience to give the initial
1121 # boot a modules.dep even before / is mounted read-write. However the
1122 # boot script depmod is the master version.
1123 PHONY += _modinst_post
1124 _modinst_post: _modinst_
1125 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1126 $(call cmd,depmod)
1127
1128 ifeq ($(CONFIG_MODULE_SIG), y)
1129 PHONY += modules_sign
1130 modules_sign:
1131 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1132 endif
1133
1134 else # CONFIG_MODULES
1135
1136 # Modules not configured
1137 # ---------------------------------------------------------------------------
1138
1139 modules modules_install: FORCE
1140 @echo >&2
1141 @echo >&2 "The present kernel configuration has modules disabled."
1142 @echo >&2 "Type 'make config' and enable loadable module support."
1143 @echo >&2 "Then build a kernel with module support enabled."
1144 @echo >&2
1145 @exit 1
1146
1147 endif # CONFIG_MODULES
1148
1149 ###
1150 # Cleaning is done on three levels.
1151 # make clean Delete most generated files
1152 # Leave enough to build external modules
1153 # make mrproper Delete the current configuration, and all generated files
1154 # make distclean Remove editor backup files, patch leftover files and the like
1155
1156 # Directories & files removed with 'make clean'
1157 CLEAN_DIRS += $(MODVERDIR)
1158
1159 # Directories & files removed with 'make mrproper'
1160 MRPROPER_DIRS += include/config usr/include include/generated \
1161 arch/*/include/generated .tmp_objdiff
1162 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1163 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1164 signing_key.priv signing_key.x509 x509.genkey \
1165 extra_certificates signing_key.x509.keyid \
1166 signing_key.x509.signer include/linux/version.h
1167
1168 # clean - Delete most, but leave enough to build external modules
1169 #
1170 clean: rm-dirs := $(CLEAN_DIRS)
1171 clean: rm-files := $(CLEAN_FILES)
1172 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1173
1174 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1175 $(clean-dirs):
1176 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1177
1178 vmlinuxclean:
1179 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1180
1181 clean: archclean vmlinuxclean
1182
1183 # mrproper - Delete all generated files, including .config
1184 #
1185 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1186 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1187 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1188
1189 PHONY += $(mrproper-dirs) mrproper archmrproper
1190 $(mrproper-dirs):
1191 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1192
1193 mrproper: clean archmrproper $(mrproper-dirs)
1194 $(call cmd,rmdirs)
1195 $(call cmd,rmfiles)
1196
1197 # distclean
1198 #
1199 PHONY += distclean
1200
1201 distclean: mrproper
1202 @find $(srctree) $(RCS_FIND_IGNORE) \
1203 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1204 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1205 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1206 -type f -print | xargs rm -f
1207
1208
1209 # Packaging of the kernel to various formats
1210 # ---------------------------------------------------------------------------
1211 # rpm target kept for backward compatibility
1212 package-dir := scripts/package
1213
1214 %src-pkg: FORCE
1215 $(Q)$(MAKE) $(build)=$(package-dir) $@
1216 %pkg: include/config/kernel.release FORCE
1217 $(Q)$(MAKE) $(build)=$(package-dir) $@
1218 rpm: include/config/kernel.release FORCE
1219 $(Q)$(MAKE) $(build)=$(package-dir) $@
1220
1221
1222 # Brief documentation of the typical targets used
1223 # ---------------------------------------------------------------------------
1224
1225 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1226 boards := $(notdir $(boards))
1227 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1228 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1229
1230 help:
1231 @echo 'Cleaning targets:'
1232 @echo ' clean - Remove most generated files but keep the config and'
1233 @echo ' enough build support to build external modules'
1234 @echo ' mrproper - Remove all generated files + config + various backup files'
1235 @echo ' distclean - mrproper + remove editor backup and patch files'
1236 @echo ''
1237 @echo 'Configuration targets:'
1238 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1239 @echo ''
1240 @echo 'Other generic targets:'
1241 @echo ' all - Build all targets marked with [*]'
1242 @echo '* vmlinux - Build the bare kernel'
1243 @echo '* modules - Build all modules'
1244 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1245 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1246 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1247 @echo ' dir/ - Build all files in dir and below'
1248 @echo ' dir/file.[oisS] - Build specified target only'
1249 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1250 @echo ' (requires a recent binutils and recent build (System.map))'
1251 @echo ' dir/file.ko - Build module including final link'
1252 @echo ' modules_prepare - Set up for building external modules'
1253 @echo ' tags/TAGS - Generate tags file for editors'
1254 @echo ' cscope - Generate cscope index'
1255 @echo ' gtags - Generate GNU GLOBAL index'
1256 @echo ' kernelrelease - Output the release version string (use with make -s)'
1257 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1258 @echo ' image_name - Output the image name (use with make -s)'
1259 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1260 echo ' (default: $(INSTALL_HDR_PATH))'; \
1261 echo ''
1262 @echo 'Static analysers'
1263 @echo ' checkstack - Generate a list of stack hogs'
1264 @echo ' namespacecheck - Name space analysis on compiled kernel'
1265 @echo ' versioncheck - Sanity check on version.h usage'
1266 @echo ' includecheck - Check for duplicate included header files'
1267 @echo ' export_report - List the usages of all exported symbols'
1268 @echo ' headers_check - Sanity check on exported headers'
1269 @echo ' headerdep - Detect inclusion cycles in headers'
1270 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1271 @echo ''
1272 @echo 'Kernel selftest'
1273 @echo ' kselftest - Build and run kernel selftest (run as root)'
1274 @echo ' Build, install, and boot kernel before'
1275 @echo ' running kselftest on it'
1276 @echo ''
1277 @echo 'Kernel packaging:'
1278 @$(MAKE) $(build)=$(package-dir) help
1279 @echo ''
1280 @echo 'Documentation targets:'
1281 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1282 @echo ''
1283 @echo 'Architecture specific targets ($(SRCARCH)):'
1284 @$(if $(archhelp),$(archhelp),\
1285 echo ' No architecture specific help defined for $(SRCARCH)')
1286 @echo ''
1287 @$(if $(boards), \
1288 $(foreach b, $(boards), \
1289 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1290 echo '')
1291 @$(if $(board-dirs), \
1292 $(foreach b, $(board-dirs), \
1293 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1294 printf " %-16s - Show all of the above\\n" help-boards; \
1295 echo '')
1296
1297 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1298 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1299 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1300 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1301 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1302 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1303 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1304 @echo ' 1: warnings which may be relevant and do not occur too often'
1305 @echo ' 2: warnings which occur quite often but may still be relevant'
1306 @echo ' 3: more obscure warnings, can most likely be ignored'
1307 @echo ' Multiple levels can be combined with W=12 or W=123'
1308 @echo ''
1309 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1310 @echo 'For further info see the ./README file'
1311
1312
1313 help-board-dirs := $(addprefix help-,$(board-dirs))
1314
1315 help-boards: $(help-board-dirs)
1316
1317 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1318
1319 $(help-board-dirs): help-%:
1320 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1321 @$(if $(boards-per-dir), \
1322 $(foreach b, $(boards-per-dir), \
1323 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1324 echo '')
1325
1326
1327 # Documentation targets
1328 # ---------------------------------------------------------------------------
1329 %docs: scripts_basic FORCE
1330 $(Q)$(MAKE) $(build)=scripts build_docproc
1331 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1332
1333 else # KBUILD_EXTMOD
1334
1335 ###
1336 # External module support.
1337 # When building external modules the kernel used as basis is considered
1338 # read-only, and no consistency checks are made and the make
1339 # system is not used on the basis kernel. If updates are required
1340 # in the basis kernel ordinary make commands (without M=...) must
1341 # be used.
1342 #
1343 # The following are the only valid targets when building external
1344 # modules.
1345 # make M=dir clean Delete all automatically generated files
1346 # make M=dir modules Make all modules in specified dir
1347 # make M=dir Same as 'make M=dir modules'
1348 # make M=dir modules_install
1349 # Install the modules built in the module directory
1350 # Assumes install directory is already created
1351
1352 # We are always building modules
1353 KBUILD_MODULES := 1
1354 PHONY += crmodverdir
1355 crmodverdir:
1356 $(cmd_crmodverdir)
1357
1358 PHONY += $(objtree)/Module.symvers
1359 $(objtree)/Module.symvers:
1360 @test -e $(objtree)/Module.symvers || ( \
1361 echo; \
1362 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1363 echo " is missing; modules will have no dependencies and modversions."; \
1364 echo )
1365
1366 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1367 PHONY += $(module-dirs) modules
1368 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1369 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1370
1371 modules: $(module-dirs)
1372 @$(kecho) ' Building modules, stage 2.';
1373 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1374
1375 PHONY += modules_install
1376 modules_install: _emodinst_ _emodinst_post
1377
1378 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1379 PHONY += _emodinst_
1380 _emodinst_:
1381 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1382 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1383
1384 PHONY += _emodinst_post
1385 _emodinst_post: _emodinst_
1386 $(call cmd,depmod)
1387
1388 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1389
1390 PHONY += $(clean-dirs) clean
1391 $(clean-dirs):
1392 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1393
1394 clean: rm-dirs := $(MODVERDIR)
1395 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1396
1397 help:
1398 @echo ' Building external modules.'
1399 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1400 @echo ''
1401 @echo ' modules - default target, build the module(s)'
1402 @echo ' modules_install - install the module'
1403 @echo ' clean - remove generated files in module directory only'
1404 @echo ''
1405
1406 # Dummies...
1407 PHONY += prepare scripts
1408 prepare: ;
1409 scripts: ;
1410 endif # KBUILD_EXTMOD
1411
1412 clean: $(clean-dirs)
1413 $(call cmd,rmdirs)
1414 $(call cmd,rmfiles)
1415 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1416 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1417 -o -name '*.ko.*' \
1418 -o -name '*.dwo' \
1419 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1420 -o -name '*.symtypes' -o -name 'modules.order' \
1421 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1422 -o -name '*.gcno' \) -type f -print | xargs rm -f
1423
1424 # Generate tags for editors
1425 # ---------------------------------------------------------------------------
1426 quiet_cmd_tags = GEN $@
1427 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1428
1429 tags TAGS cscope gtags: FORCE
1430 $(call cmd,tags)
1431
1432 # Scripts to check various things for consistency
1433 # ---------------------------------------------------------------------------
1434
1435 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1436
1437 includecheck:
1438 find $(srctree)/* $(RCS_FIND_IGNORE) \
1439 -name '*.[hcS]' -type f -print | sort \
1440 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1441
1442 versioncheck:
1443 find $(srctree)/* $(RCS_FIND_IGNORE) \
1444 -name '*.[hcS]' -type f -print | sort \
1445 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1446
1447 coccicheck:
1448 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1449
1450 namespacecheck:
1451 $(PERL) $(srctree)/scripts/namespace.pl
1452
1453 export_report:
1454 $(PERL) $(srctree)/scripts/export_report.pl
1455
1456 endif #ifeq ($(config-targets),1)
1457 endif #ifeq ($(mixed-targets),1)
1458
1459 PHONY += checkstack kernelrelease kernelversion image_name
1460
1461 # UML needs a little special treatment here. It wants to use the host
1462 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1463 # else wants $(ARCH), including people doing cross-builds, which means
1464 # that $(SUBARCH) doesn't work here.
1465 ifeq ($(ARCH), um)
1466 CHECKSTACK_ARCH := $(SUBARCH)
1467 else
1468 CHECKSTACK_ARCH := $(ARCH)
1469 endif
1470 checkstack:
1471 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1472 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1473
1474 kernelrelease:
1475 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1476
1477 kernelversion:
1478 @echo $(KERNELVERSION)
1479
1480 image_name:
1481 @echo $(KBUILD_IMAGE)
1482
1483 # Clear a bunch of variables before executing the submake
1484 tools/: FORCE
1485 $(Q)mkdir -p $(objtree)/tools
1486 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1487
1488 tools/%: FORCE
1489 $(Q)mkdir -p $(objtree)/tools
1490 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1491
1492 # Single targets
1493 # ---------------------------------------------------------------------------
1494 # Single targets are compatible with:
1495 # - build with mixed source and output
1496 # - build with separate output dir 'make O=...'
1497 # - external modules
1498 #
1499 # target-dir => where to store outputfile
1500 # build-dir => directory in kernel source tree to use
1501
1502 ifeq ($(KBUILD_EXTMOD),)
1503 build-dir = $(patsubst %/,%,$(dir $@))
1504 target-dir = $(dir $@)
1505 else
1506 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1507 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1508 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1509 endif
1510
1511 %.s: %.c prepare scripts FORCE
1512 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1513 %.i: %.c prepare scripts FORCE
1514 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515 %.o: %.c prepare scripts FORCE
1516 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.lst: %.c prepare scripts FORCE
1518 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.s: %.S prepare scripts FORCE
1520 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.o: %.S prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.symtypes: %.c prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525
1526 # Modules
1527 /: prepare scripts FORCE
1528 $(cmd_crmodverdir)
1529 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1530 $(build)=$(build-dir)
1531 %/: prepare scripts FORCE
1532 $(cmd_crmodverdir)
1533 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1534 $(build)=$(build-dir)
1535 %.ko: prepare scripts FORCE
1536 $(cmd_crmodverdir)
1537 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1538 $(build)=$(build-dir) $(@:.ko=.o)
1539 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1540
1541 # FIXME Should go into a make.lib or something
1542 # ===========================================================================
1543
1544 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1545 cmd_rmdirs = rm -rf $(rm-dirs)
1546
1547 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1548 cmd_rmfiles = rm -f $(rm-files)
1549
1550 # Run depmod only if we have System.map and depmod is executable
1551 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1552 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1553 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1554
1555 # Create temporary dir for module support files
1556 # clean it up only when building all modules
1557 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1558 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1559
1560 # read all saved command lines
1561
1562 targets := $(wildcard $(sort $(targets)))
1563 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1564
1565 ifneq ($(cmd_files),)
1566 $(cmd_files): ; # Do not try to update included dependency files
1567 include $(cmd_files)
1568 endif
1569
1570 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1571 # Usage:
1572 # $(Q)$(MAKE) $(clean)=dir
1573 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1574
1575 endif # skip-makefile
1576
1577 PHONY += FORCE
1578 FORCE:
1579
1580 # Declare the contents of the .PHONY variable as phony. We keep that
1581 # information in a variable so we can use it in if_changed and friends.
1582 .PHONY: $(PHONY)
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