]> git.ipfire.org Git - thirdparty/kernel/stable.git/blob - Makefile
Merge branch 'stable/for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel...
[thirdparty/kernel/stable.git] / Makefile
1 VERSION = 4
2 PATCHLEVEL = 1
3 SUBLEVEL = 0
4 EXTRAVERSION = -rc6
5 NAME = Hurr durr I'ma sheep
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 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18 # Avoid funny character set dependencies
19 unexport LC_ALL
20 LC_COLLATE=C
21 LC_NUMERIC=C
22 export LC_COLLATE LC_NUMERIC
23
24 # Avoid interference with shell env settings
25 unexport GREP_OPTIONS
26
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
29 #
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
36 # is now up to date.
37 #
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
41 # prepare rule.
42
43 # Beautify output
44 # ---------------------------------------------------------------------------
45 #
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
49 #
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52 #
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
57 #
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
60 #
61 # $(Q)ln $@ :<
62 #
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
65 #
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
68
69 ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71 endif
72 ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74 endif
75
76 ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79 else
80 quiet=quiet_
81 Q = @
82 endif
83
84 # If the user is running make -s (silent mode), suppress echoing of
85 # commands
86
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90 endif
91 else # make-3.8x
92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94 endif
95 endif
96
97 export quiet Q KBUILD_VERBOSE
98
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
102 # 1) O=
103 # Use "make O=dir/to/store/output/files/"
104 #
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
109 # make
110 #
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
112 # variable.
113
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(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 # That's our default target when none is given on the command line
125 PHONY := _all
126 _all:
127
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
130
131 ifneq ($(KBUILD_OUTPUT),)
132 # Invoke a second make in the output directory, passing relevant variables
133 # check that the output directory actually exists
134 saved-output := $(KBUILD_OUTPUT)
135 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 && /bin/pwd)
137 $(if $(KBUILD_OUTPUT),, \
138 $(error failed to create output directory "$(saved-output)"))
139
140 PHONY += $(MAKECMDGOALS) sub-make
141
142 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
143 @:
144
145 sub-make: FORCE
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 ($(skip-makefile),)
156
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS += --no-print-directory
161
162 # Call a source code checker (by default, "sparse") as part of the
163 # C compilation.
164 #
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
168 #
169 # See the file "Documentation/sparse.txt" for more details, including
170 # where to get the "sparse" utility.
171
172 ifeq ("$(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 := $(M)
188 endif
189
190 # If building an external module we do not care about the all: rule
191 # but instead _all depend on modules
192 PHONY += all
193 ifeq ($(KBUILD_EXTMOD),)
194 _all: all
195 else
196 _all: modules
197 endif
198
199 ifeq ($(KBUILD_SRC),)
200 # building in the source tree
201 srctree := .
202 else
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
205 srctree := ..
206 else
207 srctree := $(KBUILD_SRC)
208 endif
209 endif
210 objtree := .
211 src := $(srctree)
212 obj := $(objtree)
213
214 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215
216 export srctree objtree VPATH
217
218
219 # SUBARCH tells the usermode build what the underlying arch is. That is set
220 # first, and if a usermode build is happening, the "ARCH=um" on the command
221 # line overrides the setting of ARCH below. If a native build is happening,
222 # then ARCH is assigned, getting whatever value it gets normally, and
223 # SUBARCH is subsequently ignored.
224
225 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
226 -e s/sun4u/sparc64/ \
227 -e s/arm.*/arm/ -e s/sa110/arm/ \
228 -e s/s390x/s390/ -e s/parisc64/parisc/ \
229 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
230 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
231
232 # Cross compiling and selecting different set of gcc/bin-utils
233 # ---------------------------------------------------------------------------
234 #
235 # When performing cross compilation for other architectures ARCH shall be set
236 # to the target architecture. (See arch/* for the possibilities).
237 # ARCH can be set during invocation of make:
238 # make ARCH=ia64
239 # Another way is to have ARCH set in the environment.
240 # The default ARCH is the host where make is executed.
241
242 # CROSS_COMPILE specify the prefix used for all executables used
243 # during compilation. Only gcc and related bin-utils executables
244 # are prefixed with $(CROSS_COMPILE).
245 # CROSS_COMPILE can be set on the command line
246 # make CROSS_COMPILE=ia64-linux-
247 # Alternatively CROSS_COMPILE can be set in the environment.
248 # A third alternative is to store a setting in .config so that plain
249 # "make" in the configured kernel build directory always uses that.
250 # Default value for CROSS_COMPILE is not to prefix executables
251 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
252 ARCH ?= $(SUBARCH)
253 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
254
255 # Architecture as present in compile.h
256 UTS_MACHINE := $(ARCH)
257 SRCARCH := $(ARCH)
258
259 # Additional ARCH settings for x86
260 ifeq ($(ARCH),i386)
261 SRCARCH := x86
262 endif
263 ifeq ($(ARCH),x86_64)
264 SRCARCH := x86
265 endif
266
267 # Additional ARCH settings for sparc
268 ifeq ($(ARCH),sparc32)
269 SRCARCH := sparc
270 endif
271 ifeq ($(ARCH),sparc64)
272 SRCARCH := sparc
273 endif
274
275 # Additional ARCH settings for sh
276 ifeq ($(ARCH),sh64)
277 SRCARCH := sh
278 endif
279
280 # Additional ARCH settings for tile
281 ifeq ($(ARCH),tilepro)
282 SRCARCH := tile
283 endif
284 ifeq ($(ARCH),tilegx)
285 SRCARCH := tile
286 endif
287
288 # Where to locate arch specific headers
289 hdr-arch := $(SRCARCH)
290
291 KCONFIG_CONFIG ?= .config
292 export KCONFIG_CONFIG
293
294 # SHELL used by kbuild
295 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
296 else if [ -x /bin/bash ]; then echo /bin/bash; \
297 else echo sh; fi ; fi)
298
299 HOSTCC = gcc
300 HOSTCXX = g++
301 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
302 HOSTCXXFLAGS = -O2
303
304 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
305 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
306 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
307 endif
308
309 # Decide whether to build built-in, modular, or both.
310 # Normally, just do built-in.
311
312 KBUILD_MODULES :=
313 KBUILD_BUILTIN := 1
314
315 # If we have only "make modules", don't compile built-in objects.
316 # When we're building modules with modversions, we need to consider
317 # the built-in objects during the descend as well, in order to
318 # make sure the checksums are up to date before we record them.
319
320 ifeq ($(MAKECMDGOALS),modules)
321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
322 endif
323
324 # If we have "make <whatever> modules", compile modules
325 # in addition to whatever we do anyway.
326 # Just "make" or "make all" shall build modules as well
327
328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
329 KBUILD_MODULES := 1
330 endif
331
332 ifeq ($(MAKECMDGOALS),)
333 KBUILD_MODULES := 1
334 endif
335
336 export KBUILD_MODULES KBUILD_BUILTIN
337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338
339 ifneq ($(CC),)
340 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
341 COMPILER := clang
342 else
343 COMPILER := gcc
344 endif
345 export COMPILER
346 endif
347
348 # We need some generic definitions (do not try to remake the file).
349 scripts/Kbuild.include: ;
350 include scripts/Kbuild.include
351
352 # Make variables (CC, etc...)
353 AS = $(CROSS_COMPILE)as
354 LD = $(CROSS_COMPILE)ld
355 CC = $(CROSS_COMPILE)gcc
356 CPP = $(CC) -E
357 AR = $(CROSS_COMPILE)ar
358 NM = $(CROSS_COMPILE)nm
359 STRIP = $(CROSS_COMPILE)strip
360 OBJCOPY = $(CROSS_COMPILE)objcopy
361 OBJDUMP = $(CROSS_COMPILE)objdump
362 AWK = awk
363 GENKSYMS = scripts/genksyms/genksyms
364 INSTALLKERNEL := installkernel
365 DEPMOD = /sbin/depmod
366 PERL = perl
367 PYTHON = python
368 CHECK = sparse
369
370 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
371 -Wbitwise -Wno-return-void $(CF)
372 CFLAGS_MODULE =
373 AFLAGS_MODULE =
374 LDFLAGS_MODULE =
375 CFLAGS_KERNEL =
376 AFLAGS_KERNEL =
377 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
378
379
380 # Use USERINCLUDE when you must reference the UAPI directories only.
381 USERINCLUDE := \
382 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
383 -Iarch/$(hdr-arch)/include/generated/uapi \
384 -I$(srctree)/include/uapi \
385 -Iinclude/generated/uapi \
386 -include $(srctree)/include/linux/kconfig.h
387
388 # Use LINUXINCLUDE when you must reference the include/ directory.
389 # Needed to be compatible with the O= option
390 LINUXINCLUDE := \
391 -I$(srctree)/arch/$(hdr-arch)/include \
392 -Iarch/$(hdr-arch)/include/generated/uapi \
393 -Iarch/$(hdr-arch)/include/generated \
394 $(if $(KBUILD_SRC), -I$(srctree)/include) \
395 -Iinclude \
396 $(USERINCLUDE)
397
398 KBUILD_CPPFLAGS := -D__KERNEL__
399
400 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
401 -fno-strict-aliasing -fno-common \
402 -Werror-implicit-function-declaration \
403 -Wno-format-security \
404 -std=gnu89
405
406 KBUILD_AFLAGS_KERNEL :=
407 KBUILD_CFLAGS_KERNEL :=
408 KBUILD_AFLAGS := -D__ASSEMBLY__
409 KBUILD_AFLAGS_MODULE := -DMODULE
410 KBUILD_CFLAGS_MODULE := -DMODULE
411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
412
413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
416
417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419 export CPP AR NM STRIP OBJCOPY OBJDUMP
420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
422
423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428 export KBUILD_ARFLAGS
429
430 # When compiling out-of-tree modules, put MODVERDIR in the module
431 # tree rather than in the kernel tree. The kernel tree might
432 # even be read-only.
433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
434
435 # Files to ignore in find ... statements
436
437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
439 -prune -o
440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441 --exclude CVS --exclude .pc --exclude .hg --exclude .git
442
443 # ===========================================================================
444 # Rules shared between *config targets and build targets
445
446 # Basic helpers built in scripts/
447 PHONY += scripts_basic
448 scripts_basic:
449 $(Q)$(MAKE) $(build)=scripts/basic
450 $(Q)rm -f .tmp_quiet_recordmcount
451
452 # To avoid any implicit rule to kick in, define an empty command.
453 scripts/basic/%: scripts_basic ;
454
455 PHONY += outputmakefile
456 # outputmakefile generates a Makefile in the output directory, if using a
457 # separate output directory. This allows convenient use of make in the
458 # output directory.
459 outputmakefile:
460 ifneq ($(KBUILD_SRC),)
461 $(Q)ln -fsn $(srctree) source
462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464 endif
465
466 # Support for using generic headers in asm-generic
467 PHONY += asm-generic
468 asm-generic:
469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470 src=asm obj=arch/$(SRCARCH)/include/generated/asm
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
473
474 # To make sure we do not include .config for any of the *config targets
475 # catch them early, and hand them over to scripts/kconfig/Makefile
476 # It is allowed to specify more targets when calling make, including
477 # mixing *config targets and build targets.
478 # For example 'make oldconfig all'.
479 # Detect when mixed targets is specified, and make a second invocation
480 # of make so .config is not included in this case either (for *config).
481
482 version_h := include/generated/uapi/linux/version.h
483 old_version_h := include/linux/version.h
484
485 no-dot-config-targets := clean mrproper distclean \
486 cscope gtags TAGS tags help% %docs check% coccicheck \
487 $(version_h) headers_% archheaders archscripts \
488 kernelversion %src-pkg
489
490 config-targets := 0
491 mixed-targets := 0
492 dot-config := 1
493
494 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 dot-config := 0
497 endif
498 endif
499
500 ifeq ($(KBUILD_EXTMOD),)
501 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502 config-targets := 1
503 ifneq ($(words $(MAKECMDGOALS)),1)
504 mixed-targets := 1
505 endif
506 endif
507 endif
508
509 ifeq ($(mixed-targets),1)
510 # ===========================================================================
511 # We're called with mixed targets (*config and build targets).
512 # Handle them one by one.
513
514 PHONY += $(MAKECMDGOALS) __build_one_by_one
515
516 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
517 @:
518
519 __build_one_by_one:
520 $(Q)set -e; \
521 for i in $(MAKECMDGOALS); do \
522 $(MAKE) -f $(srctree)/Makefile $$i; \
523 done
524
525 else
526 ifeq ($(config-targets),1)
527 # ===========================================================================
528 # *config targets only - make sure prerequisites are updated, and descend
529 # in scripts/kconfig to make the *config target
530
531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
532 # KBUILD_DEFCONFIG may point out an alternative default configuration
533 # used for 'make defconfig'
534 include arch/$(SRCARCH)/Makefile
535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
536
537 config: scripts_basic outputmakefile FORCE
538 $(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540 %config: scripts_basic outputmakefile FORCE
541 $(Q)$(MAKE) $(build)=scripts/kconfig $@
542
543 else
544 # ===========================================================================
545 # Build targets only - this includes vmlinux, arch specific targets, clean
546 # targets and others. In general all targets except *config targets.
547
548 ifeq ($(KBUILD_EXTMOD),)
549 # Additional helpers built in scripts/
550 # Carefully list dependencies so we do not try to build scripts twice
551 # in parallel
552 PHONY += scripts
553 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
554 asm-generic
555 $(Q)$(MAKE) $(build)=$(@)
556
557 # Objects we will link into vmlinux / subdirs we need to visit
558 init-y := init/
559 drivers-y := drivers/ sound/ firmware/
560 net-y := net/
561 libs-y := lib/
562 core-y := usr/
563 endif # KBUILD_EXTMOD
564
565 ifeq ($(dot-config),1)
566 # Read in config
567 -include include/config/auto.conf
568
569 ifeq ($(KBUILD_EXTMOD),)
570 # Read in dependencies to all Kconfig* files, make sure to run
571 # oldconfig if changes are detected.
572 -include include/config/auto.conf.cmd
573
574 # To avoid any implicit rule to kick in, define an empty command
575 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
576
577 # If .config is newer than include/config/auto.conf, someone tinkered
578 # with it and forgot to run make oldconfig.
579 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
580 # we execute the config step to be sure to catch updated Kconfig files
581 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
582 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
583 else
584 # external modules needs include/generated/autoconf.h and include/config/auto.conf
585 # but do not care if they are up-to-date. Use auto.conf to trigger the test
586 PHONY += include/config/auto.conf
587
588 include/config/auto.conf:
589 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
590 echo >&2; \
591 echo >&2 " ERROR: Kernel configuration is invalid."; \
592 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
593 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
594 echo >&2 ; \
595 /bin/false)
596
597 endif # KBUILD_EXTMOD
598
599 else
600 # Dummy target needed, because used as prerequisite
601 include/config/auto.conf: ;
602 endif # $(dot-config)
603
604 # The all: target is the default when no target is given on the
605 # command line.
606 # This allow a user to issue only 'make' to build a kernel including modules
607 # Defaults to vmlinux, but the arch makefile usually adds further targets
608 all: vmlinux
609
610 include arch/$(SRCARCH)/Makefile
611
612 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
613
614 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
615 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
616 else
617 KBUILD_CFLAGS += -O2
618 endif
619
620 # Tell gcc to never replace conditional load with a non-conditional one
621 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
622
623 ifdef CONFIG_READABLE_ASM
624 # Disable optimizations that make assembler listings hard to read.
625 # reorder blocks reorders the control in the function
626 # ipa clone creates specialized cloned functions
627 # partial inlining inlines only parts of functions
628 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
629 $(call cc-option,-fno-ipa-cp-clone,) \
630 $(call cc-option,-fno-partial-inlining)
631 endif
632
633 ifneq ($(CONFIG_FRAME_WARN),0)
634 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
635 endif
636
637 # Handle stack protector mode.
638 #
639 # Since kbuild can potentially perform two passes (first with the old
640 # .config values and then with updated .config values), we cannot error out
641 # if a desired compiler option is unsupported. If we were to error, kbuild
642 # could never get to the second pass and actually notice that we changed
643 # the option to something that was supported.
644 #
645 # Additionally, we don't want to fallback and/or silently change which compiler
646 # flags will be used, since that leads to producing kernels with different
647 # security feature characteristics depending on the compiler used. ("But I
648 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
649 #
650 # The middle ground is to warn here so that the failed option is obvious, but
651 # to let the build fail with bad compiler flags so that we can't produce a
652 # kernel when there is a CONFIG and compiler mismatch.
653 #
654 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
655 stackp-flag := -fstack-protector
656 ifeq ($(call cc-option, $(stackp-flag)),)
657 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
658 -fstack-protector not supported by compiler)
659 endif
660 else
661 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
662 stackp-flag := -fstack-protector-strong
663 ifeq ($(call cc-option, $(stackp-flag)),)
664 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
665 -fstack-protector-strong not supported by compiler)
666 endif
667 else
668 # Force off for distro compilers that enable stack protector by default.
669 stackp-flag := $(call cc-option, -fno-stack-protector)
670 endif
671 endif
672 KBUILD_CFLAGS += $(stackp-flag)
673
674 ifeq ($(COMPILER),clang)
675 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
676 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
677 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
678 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
679 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
680 # Quiet clang warning: comparison of unsigned expression < 0 is always false
681 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
682 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
683 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
684 # See modpost pattern 2
685 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
686 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
687 else
688
689 # This warning generated too much noise in a regular build.
690 # Use make W=1 to enable this warning (see scripts/Makefile.build)
691 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
692 endif
693
694 ifdef CONFIG_FRAME_POINTER
695 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
696 else
697 # Some targets (ARM with Thumb2, for example), can't be built with frame
698 # pointers. For those, we don't have FUNCTION_TRACER automatically
699 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
700 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
701 # -fomit-frame-pointer with FUNCTION_TRACER.
702 ifndef CONFIG_FUNCTION_TRACER
703 KBUILD_CFLAGS += -fomit-frame-pointer
704 endif
705 endif
706
707 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
708
709 ifdef CONFIG_DEBUG_INFO
710 ifdef CONFIG_DEBUG_INFO_SPLIT
711 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
712 else
713 KBUILD_CFLAGS += -g
714 endif
715 KBUILD_AFLAGS += -Wa,-gdwarf-2
716 endif
717 ifdef CONFIG_DEBUG_INFO_DWARF4
718 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
719 endif
720
721 ifdef CONFIG_DEBUG_INFO_REDUCED
722 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
723 $(call cc-option,-fno-var-tracking)
724 endif
725
726 ifdef CONFIG_FUNCTION_TRACER
727 ifndef CC_FLAGS_FTRACE
728 CC_FLAGS_FTRACE := -pg
729 endif
730 export CC_FLAGS_FTRACE
731 ifdef CONFIG_HAVE_FENTRY
732 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
733 endif
734 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
735 KBUILD_AFLAGS += $(CC_USING_FENTRY)
736 ifdef CONFIG_DYNAMIC_FTRACE
737 ifdef CONFIG_HAVE_C_RECORDMCOUNT
738 BUILD_C_RECORDMCOUNT := y
739 export BUILD_C_RECORDMCOUNT
740 endif
741 endif
742 endif
743
744 # We trigger additional mismatches with less inlining
745 ifdef CONFIG_DEBUG_SECTION_MISMATCH
746 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
747 endif
748
749 # arch Makefile may override CC so keep this after arch Makefile is included
750 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
751 CHECKFLAGS += $(NOSTDINC_FLAGS)
752
753 # warn about C99 declaration after statement
754 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
755
756 # disable pointer signed / unsigned warnings in gcc 4.0
757 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
758
759 # disable invalid "can't wrap" optimizations for signed / pointers
760 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
761
762 # conserve stack if available
763 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
764
765 # disallow errors like 'EXPORT_GPL(foo);' with missing header
766 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
767
768 # require functions to have arguments in prototypes, not empty 'int foo()'
769 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
770
771 # Prohibit date/time macros, which would make the build non-deterministic
772 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
773
774 # use the deterministic mode of AR if available
775 KBUILD_ARFLAGS := $(call ar-option,D)
776
777 # check for 'asm goto'
778 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
779 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
780 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
781 endif
782
783 include scripts/Makefile.kasan
784 include scripts/Makefile.extrawarn
785
786 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
787 KBUILD_CPPFLAGS += $(KCPPFLAGS)
788 KBUILD_AFLAGS += $(KAFLAGS)
789 KBUILD_CFLAGS += $(KCFLAGS)
790
791 # Use --build-id when available.
792 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
793 $(call cc-ldoption, -Wl$(comma)--build-id,))
794 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
795 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
796
797 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
798 LDFLAGS_vmlinux += $(call ld-option, -X,)
799 endif
800
801 # Default kernel image to build when no specific target is given.
802 # KBUILD_IMAGE may be overruled on the command line or
803 # set in the environment
804 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
805 # this default value
806 export KBUILD_IMAGE ?= vmlinux
807
808 #
809 # INSTALL_PATH specifies where to place the updated kernel and system map
810 # images. Default is /boot, but you can set it to other values
811 export INSTALL_PATH ?= /boot
812
813 #
814 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
815 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
816 # an argument if needed. Otherwise it defaults to the kernel install path
817 #
818 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
819
820 #
821 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
822 # relocations required by build roots. This is not defined in the
823 # makefile but the argument can be passed to make if needed.
824 #
825
826 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
827 export MODLIB
828
829 #
830 # INSTALL_MOD_STRIP, if defined, will cause modules to be
831 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
832 # the default option --strip-debug will be used. Otherwise,
833 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
834
835 ifdef INSTALL_MOD_STRIP
836 ifeq ($(INSTALL_MOD_STRIP),1)
837 mod_strip_cmd = $(STRIP) --strip-debug
838 else
839 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
840 endif # INSTALL_MOD_STRIP=1
841 else
842 mod_strip_cmd = true
843 endif # INSTALL_MOD_STRIP
844 export mod_strip_cmd
845
846 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
847 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
848 # or CONFIG_MODULE_COMPRESS_XZ.
849
850 mod_compress_cmd = true
851 ifdef CONFIG_MODULE_COMPRESS
852 ifdef CONFIG_MODULE_COMPRESS_GZIP
853 mod_compress_cmd = gzip -n
854 endif # CONFIG_MODULE_COMPRESS_GZIP
855 ifdef CONFIG_MODULE_COMPRESS_XZ
856 mod_compress_cmd = xz
857 endif # CONFIG_MODULE_COMPRESS_XZ
858 endif # CONFIG_MODULE_COMPRESS
859 export mod_compress_cmd
860
861 # Select initial ramdisk compression format, default is gzip(1).
862 # This shall be used by the dracut(8) tool while creating an initramfs image.
863 #
864 INITRD_COMPRESS-y := gzip
865 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
866 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
867 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
868 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
869 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
870 # do not export INITRD_COMPRESS, since we didn't actually
871 # choose a sane default compression above.
872 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
873
874 ifdef CONFIG_MODULE_SIG_ALL
875 MODSECKEY = ./signing_key.priv
876 MODPUBKEY = ./signing_key.x509
877 export MODPUBKEY
878 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
879 else
880 mod_sign_cmd = true
881 endif
882 export mod_sign_cmd
883
884
885 ifeq ($(KBUILD_EXTMOD),)
886 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
887
888 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
889 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
890 $(net-y) $(net-m) $(libs-y) $(libs-m)))
891
892 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
893 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
894
895 init-y := $(patsubst %/, %/built-in.o, $(init-y))
896 core-y := $(patsubst %/, %/built-in.o, $(core-y))
897 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
898 net-y := $(patsubst %/, %/built-in.o, $(net-y))
899 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
900 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
901 libs-y := $(libs-y1) $(libs-y2)
902
903 # Externally visible symbols (used by link-vmlinux.sh)
904 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
905 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
906 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
907 export LDFLAGS_vmlinux
908 # used by scripts/pacmage/Makefile
909 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
910
911 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
912
913 # Final link of vmlinux
914 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
915 quiet_cmd_link-vmlinux = LINK $@
916
917 # Include targets which we want to
918 # execute if the rest of the kernel build went well.
919 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
920 ifdef CONFIG_HEADERS_CHECK
921 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
922 endif
923 ifdef CONFIG_SAMPLES
924 $(Q)$(MAKE) $(build)=samples
925 endif
926 ifdef CONFIG_BUILD_DOCSRC
927 $(Q)$(MAKE) $(build)=Documentation
928 endif
929 ifdef CONFIG_GDB_SCRIPTS
930 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
931 endif
932 +$(call if_changed,link-vmlinux)
933
934 # The actual objects are generated when descending,
935 # make sure no implicit rule kicks in
936 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
937
938 # Handle descending into subdirectories listed in $(vmlinux-dirs)
939 # Preset locale variables to speed up the build process. Limit locale
940 # tweaks to this spot to avoid wrong language settings when running
941 # make menuconfig etc.
942 # Error messages still appears in the original language
943
944 PHONY += $(vmlinux-dirs)
945 $(vmlinux-dirs): prepare scripts
946 $(Q)$(MAKE) $(build)=$@
947
948 define filechk_kernel.release
949 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
950 endef
951
952 # Store (new) KERNELRELEASE string in include/config/kernel.release
953 include/config/kernel.release: include/config/auto.conf FORCE
954 $(call filechk,kernel.release)
955
956
957 # Things we need to do before we recursively start building the kernel
958 # or the modules are listed in "prepare".
959 # A multi level approach is used. prepareN is processed before prepareN-1.
960 # archprepare is used in arch Makefiles and when processed asm symlink,
961 # version.h and scripts_basic is processed / created.
962
963 # Listed in dependency order
964 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
965
966 # prepare3 is used to check if we are building in a separate output directory,
967 # and if so do:
968 # 1) Check that make has not been executed in the kernel src $(srctree)
969 prepare3: include/config/kernel.release
970 ifneq ($(KBUILD_SRC),)
971 @$(kecho) ' Using $(srctree) as source for kernel'
972 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
973 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
974 echo >&2 " in the '$(srctree)' directory.";\
975 /bin/false; \
976 fi;
977 endif
978
979 # prepare2 creates a makefile if using a separate output directory
980 prepare2: prepare3 outputmakefile asm-generic
981
982 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
983 include/config/auto.conf
984 $(cmd_crmodverdir)
985
986 archprepare: archheaders archscripts prepare1 scripts_basic
987
988 prepare0: archprepare FORCE
989 $(Q)$(MAKE) $(build)=.
990
991 # All the preparing..
992 prepare: prepare0
993
994 # Generate some files
995 # ---------------------------------------------------------------------------
996
997 # KERNELRELEASE can change from a few different places, meaning version.h
998 # needs to be updated, so this check is forced on all builds
999
1000 uts_len := 64
1001 define filechk_utsrelease.h
1002 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1003 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1004 exit 1; \
1005 fi; \
1006 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1007 endef
1008
1009 define filechk_version.h
1010 (echo \#define LINUX_VERSION_CODE $(shell \
1011 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1012 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1013 endef
1014
1015 $(version_h): $(srctree)/Makefile FORCE
1016 $(call filechk,version.h)
1017 $(Q)rm -f $(old_version_h)
1018
1019 include/generated/utsrelease.h: include/config/kernel.release FORCE
1020 $(call filechk,utsrelease.h)
1021
1022 PHONY += headerdep
1023 headerdep:
1024 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1025 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1026
1027 # ---------------------------------------------------------------------------
1028 # Firmware install
1029 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1030 export INSTALL_FW_PATH
1031
1032 PHONY += firmware_install
1033 firmware_install: FORCE
1034 @mkdir -p $(objtree)/firmware
1035 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1036
1037 # ---------------------------------------------------------------------------
1038 # Kernel headers
1039
1040 #Default location for installed headers
1041 export INSTALL_HDR_PATH = $(objtree)/usr
1042
1043 # If we do an all arch process set dst to asm-$(hdr-arch)
1044 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1045
1046 PHONY += archheaders
1047 archheaders:
1048
1049 PHONY += archscripts
1050 archscripts:
1051
1052 PHONY += __headers
1053 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1054 $(Q)$(MAKE) $(build)=scripts build_unifdef
1055
1056 PHONY += headers_install_all
1057 headers_install_all:
1058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1059
1060 PHONY += headers_install
1061 headers_install: __headers
1062 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1063 $(error Headers not exportable for the $(SRCARCH) architecture))
1064 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1065 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1066
1067 PHONY += headers_check_all
1068 headers_check_all: headers_install_all
1069 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1070
1071 PHONY += headers_check
1072 headers_check: headers_install
1073 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1074 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1075
1076 # ---------------------------------------------------------------------------
1077 # Kernel selftest
1078
1079 PHONY += kselftest
1080 kselftest:
1081 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1082
1083 # ---------------------------------------------------------------------------
1084 # Modules
1085
1086 ifdef CONFIG_MODULES
1087
1088 # By default, build modules as well
1089
1090 all: modules
1091
1092 # Build modules
1093 #
1094 # A module can be listed more than once in obj-m resulting in
1095 # duplicate lines in modules.order files. Those are removed
1096 # using awk while concatenating to the final file.
1097
1098 PHONY += modules
1099 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1100 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1101 @$(kecho) ' Building modules, stage 2.';
1102 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1103 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1104
1105 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1106 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1107
1108 %/modules.builtin: include/config/auto.conf
1109 $(Q)$(MAKE) $(modbuiltin)=$*
1110
1111
1112 # Target to prepare building external modules
1113 PHONY += modules_prepare
1114 modules_prepare: prepare scripts
1115
1116 # Target to install modules
1117 PHONY += modules_install
1118 modules_install: _modinst_ _modinst_post
1119
1120 PHONY += _modinst_
1121 _modinst_:
1122 @rm -rf $(MODLIB)/kernel
1123 @rm -f $(MODLIB)/source
1124 @mkdir -p $(MODLIB)/kernel
1125 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1126 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1127 rm -f $(MODLIB)/build ; \
1128 ln -s $(CURDIR) $(MODLIB)/build ; \
1129 fi
1130 @cp -f $(objtree)/modules.order $(MODLIB)/
1131 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1132 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1133
1134 # This depmod is only for convenience to give the initial
1135 # boot a modules.dep even before / is mounted read-write. However the
1136 # boot script depmod is the master version.
1137 PHONY += _modinst_post
1138 _modinst_post: _modinst_
1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1140 $(call cmd,depmod)
1141
1142 ifeq ($(CONFIG_MODULE_SIG), y)
1143 PHONY += modules_sign
1144 modules_sign:
1145 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1146 endif
1147
1148 else # CONFIG_MODULES
1149
1150 # Modules not configured
1151 # ---------------------------------------------------------------------------
1152
1153 modules modules_install: FORCE
1154 @echo >&2
1155 @echo >&2 "The present kernel configuration has modules disabled."
1156 @echo >&2 "Type 'make config' and enable loadable module support."
1157 @echo >&2 "Then build a kernel with module support enabled."
1158 @echo >&2
1159 @exit 1
1160
1161 endif # CONFIG_MODULES
1162
1163 ###
1164 # Cleaning is done on three levels.
1165 # make clean Delete most generated files
1166 # Leave enough to build external modules
1167 # make mrproper Delete the current configuration, and all generated files
1168 # make distclean Remove editor backup files, patch leftover files and the like
1169
1170 # Directories & files removed with 'make clean'
1171 CLEAN_DIRS += $(MODVERDIR)
1172
1173 # Directories & files removed with 'make mrproper'
1174 MRPROPER_DIRS += include/config usr/include include/generated \
1175 arch/*/include/generated .tmp_objdiff
1176 MRPROPER_FILES += .config .config.old .version .old_version \
1177 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1178 signing_key.priv signing_key.x509 x509.genkey \
1179 extra_certificates signing_key.x509.keyid \
1180 signing_key.x509.signer vmlinux-gdb.py
1181
1182 # clean - Delete most, but leave enough to build external modules
1183 #
1184 clean: rm-dirs := $(CLEAN_DIRS)
1185 clean: rm-files := $(CLEAN_FILES)
1186 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1187
1188 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1189 $(clean-dirs):
1190 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1191
1192 vmlinuxclean:
1193 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1194
1195 clean: archclean vmlinuxclean
1196
1197 # mrproper - Delete all generated files, including .config
1198 #
1199 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1200 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1201 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1202
1203 PHONY += $(mrproper-dirs) mrproper archmrproper
1204 $(mrproper-dirs):
1205 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1206
1207 mrproper: clean archmrproper $(mrproper-dirs)
1208 $(call cmd,rmdirs)
1209 $(call cmd,rmfiles)
1210
1211 # distclean
1212 #
1213 PHONY += distclean
1214
1215 distclean: mrproper
1216 @find $(srctree) $(RCS_FIND_IGNORE) \
1217 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1218 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1219 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1220 -type f -print | xargs rm -f
1221
1222
1223 # Packaging of the kernel to various formats
1224 # ---------------------------------------------------------------------------
1225 # rpm target kept for backward compatibility
1226 package-dir := scripts/package
1227
1228 %src-pkg: FORCE
1229 $(Q)$(MAKE) $(build)=$(package-dir) $@
1230 %pkg: include/config/kernel.release FORCE
1231 $(Q)$(MAKE) $(build)=$(package-dir) $@
1232 rpm: include/config/kernel.release FORCE
1233 $(Q)$(MAKE) $(build)=$(package-dir) $@
1234
1235
1236 # Brief documentation of the typical targets used
1237 # ---------------------------------------------------------------------------
1238
1239 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1240 boards := $(sort $(notdir $(boards)))
1241 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1242 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1243
1244 help:
1245 @echo 'Cleaning targets:'
1246 @echo ' clean - Remove most generated files but keep the config and'
1247 @echo ' enough build support to build external modules'
1248 @echo ' mrproper - Remove all generated files + config + various backup files'
1249 @echo ' distclean - mrproper + remove editor backup and patch files'
1250 @echo ''
1251 @echo 'Configuration targets:'
1252 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1253 @echo ''
1254 @echo 'Other generic targets:'
1255 @echo ' all - Build all targets marked with [*]'
1256 @echo '* vmlinux - Build the bare kernel'
1257 @echo '* modules - Build all modules'
1258 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1259 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1260 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1261 @echo ' dir/ - Build all files in dir and below'
1262 @echo ' dir/file.[oisS] - Build specified target only'
1263 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1264 @echo ' (requires a recent binutils and recent build (System.map))'
1265 @echo ' dir/file.ko - Build module including final link'
1266 @echo ' modules_prepare - Set up for building external modules'
1267 @echo ' tags/TAGS - Generate tags file for editors'
1268 @echo ' cscope - Generate cscope index'
1269 @echo ' gtags - Generate GNU GLOBAL index'
1270 @echo ' kernelrelease - Output the release version string (use with make -s)'
1271 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1272 @echo ' image_name - Output the image name (use with make -s)'
1273 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1274 echo ' (default: $(INSTALL_HDR_PATH))'; \
1275 echo ''
1276 @echo 'Static analysers'
1277 @echo ' checkstack - Generate a list of stack hogs'
1278 @echo ' namespacecheck - Name space analysis on compiled kernel'
1279 @echo ' versioncheck - Sanity check on version.h usage'
1280 @echo ' includecheck - Check for duplicate included header files'
1281 @echo ' export_report - List the usages of all exported symbols'
1282 @echo ' headers_check - Sanity check on exported headers'
1283 @echo ' headerdep - Detect inclusion cycles in headers'
1284 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1285 @echo ''
1286 @echo 'Kernel selftest'
1287 @echo ' kselftest - Build and run kernel selftest (run as root)'
1288 @echo ' Build, install, and boot kernel before'
1289 @echo ' running kselftest on it'
1290 @echo ''
1291 @echo 'Kernel packaging:'
1292 @$(MAKE) $(build)=$(package-dir) help
1293 @echo ''
1294 @echo 'Documentation targets:'
1295 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1296 @echo ''
1297 @echo 'Architecture specific targets ($(SRCARCH)):'
1298 @$(if $(archhelp),$(archhelp),\
1299 echo ' No architecture specific help defined for $(SRCARCH)')
1300 @echo ''
1301 @$(if $(boards), \
1302 $(foreach b, $(boards), \
1303 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1304 echo '')
1305 @$(if $(board-dirs), \
1306 $(foreach b, $(board-dirs), \
1307 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1308 printf " %-16s - Show all of the above\\n" help-boards; \
1309 echo '')
1310
1311 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1312 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1313 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1314 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1315 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1316 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1317 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1318 @echo ' 1: warnings which may be relevant and do not occur too often'
1319 @echo ' 2: warnings which occur quite often but may still be relevant'
1320 @echo ' 3: more obscure warnings, can most likely be ignored'
1321 @echo ' Multiple levels can be combined with W=12 or W=123'
1322 @echo ''
1323 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1324 @echo 'For further info see the ./README file'
1325
1326
1327 help-board-dirs := $(addprefix help-,$(board-dirs))
1328
1329 help-boards: $(help-board-dirs)
1330
1331 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1332
1333 $(help-board-dirs): help-%:
1334 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1335 @$(if $(boards-per-dir), \
1336 $(foreach b, $(boards-per-dir), \
1337 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1338 echo '')
1339
1340
1341 # Documentation targets
1342 # ---------------------------------------------------------------------------
1343 %docs: scripts_basic FORCE
1344 $(Q)$(MAKE) $(build)=scripts build_docproc
1345 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1346
1347 else # KBUILD_EXTMOD
1348
1349 ###
1350 # External module support.
1351 # When building external modules the kernel used as basis is considered
1352 # read-only, and no consistency checks are made and the make
1353 # system is not used on the basis kernel. If updates are required
1354 # in the basis kernel ordinary make commands (without M=...) must
1355 # be used.
1356 #
1357 # The following are the only valid targets when building external
1358 # modules.
1359 # make M=dir clean Delete all automatically generated files
1360 # make M=dir modules Make all modules in specified dir
1361 # make M=dir Same as 'make M=dir modules'
1362 # make M=dir modules_install
1363 # Install the modules built in the module directory
1364 # Assumes install directory is already created
1365
1366 # We are always building modules
1367 KBUILD_MODULES := 1
1368 PHONY += crmodverdir
1369 crmodverdir:
1370 $(cmd_crmodverdir)
1371
1372 PHONY += $(objtree)/Module.symvers
1373 $(objtree)/Module.symvers:
1374 @test -e $(objtree)/Module.symvers || ( \
1375 echo; \
1376 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1377 echo " is missing; modules will have no dependencies and modversions."; \
1378 echo )
1379
1380 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1381 PHONY += $(module-dirs) modules
1382 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1383 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1384
1385 modules: $(module-dirs)
1386 @$(kecho) ' Building modules, stage 2.';
1387 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1388
1389 PHONY += modules_install
1390 modules_install: _emodinst_ _emodinst_post
1391
1392 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1393 PHONY += _emodinst_
1394 _emodinst_:
1395 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1396 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1397
1398 PHONY += _emodinst_post
1399 _emodinst_post: _emodinst_
1400 $(call cmd,depmod)
1401
1402 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1403
1404 PHONY += $(clean-dirs) clean
1405 $(clean-dirs):
1406 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1407
1408 clean: rm-dirs := $(MODVERDIR)
1409 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1410
1411 help:
1412 @echo ' Building external modules.'
1413 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1414 @echo ''
1415 @echo ' modules - default target, build the module(s)'
1416 @echo ' modules_install - install the module'
1417 @echo ' clean - remove generated files in module directory only'
1418 @echo ''
1419
1420 # Dummies...
1421 PHONY += prepare scripts
1422 prepare: ;
1423 scripts: ;
1424 endif # KBUILD_EXTMOD
1425
1426 clean: $(clean-dirs)
1427 $(call cmd,rmdirs)
1428 $(call cmd,rmfiles)
1429 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1430 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1431 -o -name '*.ko.*' \
1432 -o -name '*.dwo' \
1433 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1434 -o -name '*.symtypes' -o -name 'modules.order' \
1435 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1436 -o -name '*.gcno' \) -type f -print | xargs rm -f
1437
1438 # Generate tags for editors
1439 # ---------------------------------------------------------------------------
1440 quiet_cmd_tags = GEN $@
1441 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1442
1443 tags TAGS cscope gtags: FORCE
1444 $(call cmd,tags)
1445
1446 # Scripts to check various things for consistency
1447 # ---------------------------------------------------------------------------
1448
1449 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1450
1451 includecheck:
1452 find $(srctree)/* $(RCS_FIND_IGNORE) \
1453 -name '*.[hcS]' -type f -print | sort \
1454 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1455
1456 versioncheck:
1457 find $(srctree)/* $(RCS_FIND_IGNORE) \
1458 -name '*.[hcS]' -type f -print | sort \
1459 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1460
1461 coccicheck:
1462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1463
1464 namespacecheck:
1465 $(PERL) $(srctree)/scripts/namespace.pl
1466
1467 export_report:
1468 $(PERL) $(srctree)/scripts/export_report.pl
1469
1470 endif #ifeq ($(config-targets),1)
1471 endif #ifeq ($(mixed-targets),1)
1472
1473 PHONY += checkstack kernelrelease kernelversion image_name
1474
1475 # UML needs a little special treatment here. It wants to use the host
1476 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1477 # else wants $(ARCH), including people doing cross-builds, which means
1478 # that $(SUBARCH) doesn't work here.
1479 ifeq ($(ARCH), um)
1480 CHECKSTACK_ARCH := $(SUBARCH)
1481 else
1482 CHECKSTACK_ARCH := $(ARCH)
1483 endif
1484 checkstack:
1485 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1486 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1487
1488 kernelrelease:
1489 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1490
1491 kernelversion:
1492 @echo $(KERNELVERSION)
1493
1494 image_name:
1495 @echo $(KBUILD_IMAGE)
1496
1497 # Clear a bunch of variables before executing the submake
1498 tools/: FORCE
1499 $(Q)mkdir -p $(objtree)/tools
1500 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1501
1502 tools/%: FORCE
1503 $(Q)mkdir -p $(objtree)/tools
1504 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1505
1506 # Single targets
1507 # ---------------------------------------------------------------------------
1508 # Single targets are compatible with:
1509 # - build with mixed source and output
1510 # - build with separate output dir 'make O=...'
1511 # - external modules
1512 #
1513 # target-dir => where to store outputfile
1514 # build-dir => directory in kernel source tree to use
1515
1516 ifeq ($(KBUILD_EXTMOD),)
1517 build-dir = $(patsubst %/,%,$(dir $@))
1518 target-dir = $(dir $@)
1519 else
1520 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1521 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1522 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1523 endif
1524
1525 %.s: %.c prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.i: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.o: %.c prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.lst: %.c prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.s: %.S prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535 %.o: %.S prepare scripts FORCE
1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 %.symtypes: %.c prepare scripts FORCE
1538 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539
1540 # Modules
1541 /: prepare scripts FORCE
1542 $(cmd_crmodverdir)
1543 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544 $(build)=$(build-dir)
1545 # Make sure the latest headers are built for Documentation
1546 Documentation/: headers_install
1547 %/: prepare scripts FORCE
1548 $(cmd_crmodverdir)
1549 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1550 $(build)=$(build-dir)
1551 %.ko: prepare scripts FORCE
1552 $(cmd_crmodverdir)
1553 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1554 $(build)=$(build-dir) $(@:.ko=.o)
1555 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1556
1557 # FIXME Should go into a make.lib or something
1558 # ===========================================================================
1559
1560 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1561 cmd_rmdirs = rm -rf $(rm-dirs)
1562
1563 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1564 cmd_rmfiles = rm -f $(rm-files)
1565
1566 # Run depmod only if we have System.map and depmod is executable
1567 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1568 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1569 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1570
1571 # Create temporary dir for module support files
1572 # clean it up only when building all modules
1573 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1574 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1575
1576 # read all saved command lines
1577
1578 targets := $(wildcard $(sort $(targets)))
1579 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1580
1581 ifneq ($(cmd_files),)
1582 $(cmd_files): ; # Do not try to update included dependency files
1583 include $(cmd_files)
1584 endif
1585
1586 endif # skip-makefile
1587
1588 PHONY += FORCE
1589 FORCE:
1590
1591 # Declare the contents of the .PHONY variable as phony. We keep that
1592 # information in a variable so we can use it in if_changed and friends.
1593 .PHONY: $(PHONY)