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ext4: rationalize ext4_extents.h inclusion
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1 VERSION = 3
2 PATCHLEVEL = 7
3 SUBLEVEL = 0
4 EXTRAVERSION = -rc3
5 NAME = Terrified Chipmunk
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:
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
18
19 # Avoid funny character set dependencies
20 unexport LC_ALL
21 LC_COLLATE=C
22 LC_NUMERIC=C
23 export LC_COLLATE LC_NUMERIC
24
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
27 #
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.o targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
34 # is now up to date.
35 #
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
39 # prepare rule.
40
41 # To put more focus on warnings, be less verbose as default
42 # Use 'make V=1' to see the full commands
43
44 ifeq ("$(origin V)", "command line")
45 KBUILD_VERBOSE = $(V)
46 endif
47 ifndef KBUILD_VERBOSE
48 KBUILD_VERBOSE = 0
49 endif
50
51 # Call a source code checker (by default, "sparse") as part of the
52 # C compilation.
53 #
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
57 #
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
60
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
63 endif
64 ifndef KBUILD_CHECKSRC
65 KBUILD_CHECKSRC = 0
66 endif
67
68 # Use make M=dir to specify directory of external module to build
69 # Old syntax make ... SUBDIRS=$PWD is still supported
70 # Setting the environment variable KBUILD_EXTMOD take precedence
71 ifdef SUBDIRS
72 KBUILD_EXTMOD ?= $(SUBDIRS)
73 endif
74
75 ifeq ("$(origin M)", "command line")
76 KBUILD_EXTMOD := $(M)
77 endif
78
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
82 # 1) O=
83 # Use "make O=dir/to/store/output/files/"
84 #
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
89 # make
90 #
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
92 # variable.
93
94
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
97 ifeq ($(KBUILD_SRC),)
98
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
101 ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
103 endif
104
105 ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107 endif
108
109 # That's our default target when none is given on the command line
110 PHONY := _all
111 _all:
112
113 # Cancel implicit rules on top Makefile
114 $(CURDIR)/Makefile Makefile: ;
115
116 ifneq ($(KBUILD_OUTPUT),)
117 # Invoke a second make in the output directory, passing relevant variables
118 # check that the output directory actually exists
119 saved-output := $(KBUILD_OUTPUT)
120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121 $(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
123
124 PHONY += $(MAKECMDGOALS) sub-make
125
126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 $(Q)@:
128
129 sub-make: FORCE
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
134
135 # Leave processing to above invocation of make
136 skip-makefile := 1
137 endif # ifneq ($(KBUILD_OUTPUT),)
138 endif # ifeq ($(KBUILD_SRC),)
139
140 # We process the rest of the Makefile if this is the final invocation of make
141 ifeq ($(skip-makefile),)
142
143 # If building an external module we do not care about the all: rule
144 # but instead _all depend on modules
145 PHONY += all
146 ifeq ($(KBUILD_EXTMOD),)
147 _all: all
148 else
149 _all: modules
150 endif
151
152 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153 objtree := $(CURDIR)
154 src := $(srctree)
155 obj := $(objtree)
156
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159 export srctree objtree VPATH
160
161
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
167
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh[234].*/sh/ )
173
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
176 #
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
180 # make ARCH=ia64
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
183
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # A third alternative is to store a setting in .config so that plain
191 # "make" in the configured kernel build directory always uses that.
192 # Default value for CROSS_COMPILE is not to prefix executables
193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194 export KBUILD_BUILDHOST := $(SUBARCH)
195 ARCH ?= $(SUBARCH)
196 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198 # Architecture as present in compile.h
199 UTS_MACHINE := $(ARCH)
200 SRCARCH := $(ARCH)
201
202 # Additional ARCH settings for x86
203 ifeq ($(ARCH),i386)
204 SRCARCH := x86
205 endif
206 ifeq ($(ARCH),x86_64)
207 SRCARCH := x86
208 endif
209
210 # Additional ARCH settings for sparc
211 ifeq ($(ARCH),sparc32)
212 SRCARCH := sparc
213 endif
214 ifeq ($(ARCH),sparc64)
215 SRCARCH := sparc
216 endif
217
218 # Additional ARCH settings for sh
219 ifeq ($(ARCH),sh64)
220 SRCARCH := sh
221 endif
222
223 # Additional ARCH settings for tile
224 ifeq ($(ARCH),tilepro)
225 SRCARCH := tile
226 endif
227 ifeq ($(ARCH),tilegx)
228 SRCARCH := tile
229 endif
230
231 # Where to locate arch specific headers
232 hdr-arch := $(SRCARCH)
233
234 KCONFIG_CONFIG ?= .config
235 export KCONFIG_CONFIG
236
237 # SHELL used by kbuild
238 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
239 else if [ -x /bin/bash ]; then echo /bin/bash; \
240 else echo sh; fi ; fi)
241
242 HOSTCC = gcc
243 HOSTCXX = g++
244 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
245 HOSTCXXFLAGS = -O2
246
247 # Decide whether to build built-in, modular, or both.
248 # Normally, just do built-in.
249
250 KBUILD_MODULES :=
251 KBUILD_BUILTIN := 1
252
253 # If we have only "make modules", don't compile built-in objects.
254 # When we're building modules with modversions, we need to consider
255 # the built-in objects during the descend as well, in order to
256 # make sure the checksums are up to date before we record them.
257
258 ifeq ($(MAKECMDGOALS),modules)
259 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
260 endif
261
262 # If we have "make <whatever> modules", compile modules
263 # in addition to whatever we do anyway.
264 # Just "make" or "make all" shall build modules as well
265
266 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
267 KBUILD_MODULES := 1
268 endif
269
270 ifeq ($(MAKECMDGOALS),)
271 KBUILD_MODULES := 1
272 endif
273
274 export KBUILD_MODULES KBUILD_BUILTIN
275 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
276
277 # Beautify output
278 # ---------------------------------------------------------------------------
279 #
280 # Normally, we echo the whole command before executing it. By making
281 # that echo $($(quiet)$(cmd)), we now have the possibility to set
282 # $(quiet) to choose other forms of output instead, e.g.
283 #
284 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
285 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
286 #
287 # If $(quiet) is empty, the whole command will be printed.
288 # If it is set to "quiet_", only the short version will be printed.
289 # If it is set to "silent_", nothing will be printed at all, since
290 # the variable $(silent_cmd_cc_o_c) doesn't exist.
291 #
292 # A simple variant is to prefix commands with $(Q) - that's useful
293 # for commands that shall be hidden in non-verbose mode.
294 #
295 # $(Q)ln $@ :<
296 #
297 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
298 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
299
300 ifeq ($(KBUILD_VERBOSE),1)
301 quiet =
302 Q =
303 else
304 quiet=quiet_
305 Q = @
306 endif
307
308 # If the user is running make -s (silent mode), suppress echoing of
309 # commands
310
311 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
312 quiet=silent_
313 endif
314
315 export quiet Q KBUILD_VERBOSE
316
317
318 # Look for make include files relative to root of kernel src
319 MAKEFLAGS += --include-dir=$(srctree)
320
321 # We need some generic definitions (do not try to remake the file).
322 $(srctree)/scripts/Kbuild.include: ;
323 include $(srctree)/scripts/Kbuild.include
324
325 # Make variables (CC, etc...)
326
327 AS = $(CROSS_COMPILE)as
328 LD = $(CROSS_COMPILE)ld
329 CC = $(CROSS_COMPILE)gcc
330 CPP = $(CC) -E
331 AR = $(CROSS_COMPILE)ar
332 NM = $(CROSS_COMPILE)nm
333 STRIP = $(CROSS_COMPILE)strip
334 OBJCOPY = $(CROSS_COMPILE)objcopy
335 OBJDUMP = $(CROSS_COMPILE)objdump
336 AWK = awk
337 GENKSYMS = scripts/genksyms/genksyms
338 INSTALLKERNEL := installkernel
339 DEPMOD = /sbin/depmod
340 PERL = perl
341 CHECK = sparse
342
343 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
344 -Wbitwise -Wno-return-void $(CF)
345 CFLAGS_MODULE =
346 AFLAGS_MODULE =
347 LDFLAGS_MODULE =
348 CFLAGS_KERNEL =
349 AFLAGS_KERNEL =
350 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
351
352
353 # Use USERINCLUDE when you must reference the UAPI directories only.
354 USERINCLUDE := \
355 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
356 -Iarch/$(hdr-arch)/include/generated/uapi \
357 -I$(srctree)/include/uapi \
358 -Iinclude/generated/uapi \
359 -include $(srctree)/include/linux/kconfig.h
360
361 # Use LINUXINCLUDE when you must reference the include/ directory.
362 # Needed to be compatible with the O= option
363 LINUXINCLUDE := \
364 -I$(srctree)/arch/$(hdr-arch)/include \
365 -Iarch/$(hdr-arch)/include/generated \
366 $(if $(KBUILD_SRC), -I$(srctree)/include) \
367 -Iinclude \
368 $(USERINCLUDE)
369
370 KBUILD_CPPFLAGS := -D__KERNEL__
371
372 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
373 -fno-strict-aliasing -fno-common \
374 -Werror-implicit-function-declaration \
375 -Wno-format-security \
376 -fno-delete-null-pointer-checks
377 KBUILD_AFLAGS_KERNEL :=
378 KBUILD_CFLAGS_KERNEL :=
379 KBUILD_AFLAGS := -D__ASSEMBLY__
380 KBUILD_AFLAGS_MODULE := -DMODULE
381 KBUILD_CFLAGS_MODULE := -DMODULE
382 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
383
384 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
385 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
386 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
387
388 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
389 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
390 export CPP AR NM STRIP OBJCOPY OBJDUMP
391 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
392 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
393
394 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
395 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
396 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
397 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
398 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
399 export KBUILD_ARFLAGS
400
401 # When compiling out-of-tree modules, put MODVERDIR in the module
402 # tree rather than in the kernel tree. The kernel tree might
403 # even be read-only.
404 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
405
406 # Files to ignore in find ... statements
407
408 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
409 -o -name .pc -o -name .hg -o -name .git \) -prune -o
410 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
411 --exclude CVS --exclude .pc --exclude .hg --exclude .git
412
413 # ===========================================================================
414 # Rules shared between *config targets and build targets
415
416 # Basic helpers built in scripts/
417 PHONY += scripts_basic
418 scripts_basic:
419 $(Q)$(MAKE) $(build)=scripts/basic
420 $(Q)rm -f .tmp_quiet_recordmcount
421
422 # To avoid any implicit rule to kick in, define an empty command.
423 scripts/basic/%: scripts_basic ;
424
425 PHONY += outputmakefile
426 # outputmakefile generates a Makefile in the output directory, if using a
427 # separate output directory. This allows convenient use of make in the
428 # output directory.
429 outputmakefile:
430 ifneq ($(KBUILD_SRC),)
431 $(Q)ln -fsn $(srctree) source
432 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
433 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
434 endif
435
436 # Support for using generic headers in asm-generic
437 PHONY += asm-generic
438 asm-generic:
439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
440 src=asm obj=arch/$(SRCARCH)/include/generated/asm
441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
442 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
443
444 # To make sure we do not include .config for any of the *config targets
445 # catch them early, and hand them over to scripts/kconfig/Makefile
446 # It is allowed to specify more targets when calling make, including
447 # mixing *config targets and build targets.
448 # For example 'make oldconfig all'.
449 # Detect when mixed targets is specified, and make a second invocation
450 # of make so .config is not included in this case either (for *config).
451
452 version_h := include/generated/uapi/linux/version.h
453
454 no-dot-config-targets := clean mrproper distclean \
455 cscope gtags TAGS tags help %docs check% coccicheck \
456 $(version_h) headers_% archheaders archscripts \
457 kernelversion %src-pkg
458
459 config-targets := 0
460 mixed-targets := 0
461 dot-config := 1
462
463 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
464 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
465 dot-config := 0
466 endif
467 endif
468
469 ifeq ($(KBUILD_EXTMOD),)
470 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
471 config-targets := 1
472 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
473 mixed-targets := 1
474 endif
475 endif
476 endif
477
478 ifeq ($(mixed-targets),1)
479 # ===========================================================================
480 # We're called with mixed targets (*config and build targets).
481 # Handle them one by one.
482
483 %:: FORCE
484 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
485
486 else
487 ifeq ($(config-targets),1)
488 # ===========================================================================
489 # *config targets only - make sure prerequisites are updated, and descend
490 # in scripts/kconfig to make the *config target
491
492 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
493 # KBUILD_DEFCONFIG may point out an alternative default configuration
494 # used for 'make defconfig'
495 include $(srctree)/arch/$(SRCARCH)/Makefile
496 export KBUILD_DEFCONFIG KBUILD_KCONFIG
497
498 config: scripts_basic outputmakefile FORCE
499 $(Q)mkdir -p include/linux include/config
500 $(Q)$(MAKE) $(build)=scripts/kconfig $@
501
502 %config: scripts_basic outputmakefile FORCE
503 $(Q)mkdir -p include/linux include/config
504 $(Q)$(MAKE) $(build)=scripts/kconfig $@
505
506 else
507 # ===========================================================================
508 # Build targets only - this includes vmlinux, arch specific targets, clean
509 # targets and others. In general all targets except *config targets.
510
511 ifeq ($(KBUILD_EXTMOD),)
512 # Additional helpers built in scripts/
513 # Carefully list dependencies so we do not try to build scripts twice
514 # in parallel
515 PHONY += scripts
516 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
517 $(Q)$(MAKE) $(build)=$(@)
518
519 # Objects we will link into vmlinux / subdirs we need to visit
520 init-y := init/
521 drivers-y := drivers/ sound/ firmware/
522 net-y := net/
523 libs-y := lib/
524 core-y := usr/
525 endif # KBUILD_EXTMOD
526
527 ifeq ($(dot-config),1)
528 # Read in config
529 -include include/config/auto.conf
530
531 ifeq ($(KBUILD_EXTMOD),)
532 # Read in dependencies to all Kconfig* files, make sure to run
533 # oldconfig if changes are detected.
534 -include include/config/auto.conf.cmd
535
536 # To avoid any implicit rule to kick in, define an empty command
537 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
538
539 # If .config is newer than include/config/auto.conf, someone tinkered
540 # with it and forgot to run make oldconfig.
541 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
542 # we execute the config step to be sure to catch updated Kconfig files
543 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
544 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
545 else
546 # external modules needs include/generated/autoconf.h and include/config/auto.conf
547 # but do not care if they are up-to-date. Use auto.conf to trigger the test
548 PHONY += include/config/auto.conf
549
550 include/config/auto.conf:
551 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
552 echo >&2; \
553 echo >&2 " ERROR: Kernel configuration is invalid."; \
554 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
555 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
556 echo >&2 ; \
557 /bin/false)
558
559 endif # KBUILD_EXTMOD
560
561 else
562 # Dummy target needed, because used as prerequisite
563 include/config/auto.conf: ;
564 endif # $(dot-config)
565
566 # The all: target is the default when no target is given on the
567 # command line.
568 # This allow a user to issue only 'make' to build a kernel including modules
569 # Defaults to vmlinux, but the arch makefile usually adds further targets
570 all: vmlinux
571
572 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
573 KBUILD_CFLAGS += -Os
574 else
575 KBUILD_CFLAGS += -O2
576 endif
577
578 include $(srctree)/arch/$(SRCARCH)/Makefile
579
580 ifdef CONFIG_READABLE_ASM
581 # Disable optimizations that make assembler listings hard to read.
582 # reorder blocks reorders the control in the function
583 # ipa clone creates specialized cloned functions
584 # partial inlining inlines only parts of functions
585 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
586 $(call cc-option,-fno-ipa-cp-clone,) \
587 $(call cc-option,-fno-partial-inlining)
588 endif
589
590 ifneq ($(CONFIG_FRAME_WARN),0)
591 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
592 endif
593
594 # Force gcc to behave correct even for buggy distributions
595 ifndef CONFIG_CC_STACKPROTECTOR
596 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
597 endif
598
599 # This warning generated too much noise in a regular build.
600 # Use make W=1 to enable this warning (see scripts/Makefile.build)
601 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
602
603 ifdef CONFIG_FRAME_POINTER
604 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
605 else
606 # Some targets (ARM with Thumb2, for example), can't be built with frame
607 # pointers. For those, we don't have FUNCTION_TRACER automatically
608 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
609 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
610 # -fomit-frame-pointer with FUNCTION_TRACER.
611 ifndef CONFIG_FUNCTION_TRACER
612 KBUILD_CFLAGS += -fomit-frame-pointer
613 endif
614 endif
615
616 ifdef CONFIG_DEBUG_INFO
617 KBUILD_CFLAGS += -g
618 KBUILD_AFLAGS += -gdwarf-2
619 endif
620
621 ifdef CONFIG_DEBUG_INFO_REDUCED
622 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
623 endif
624
625 ifdef CONFIG_FUNCTION_TRACER
626 ifdef CONFIG_HAVE_FENTRY
627 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
628 endif
629 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
630 KBUILD_AFLAGS += $(CC_USING_FENTRY)
631 ifdef CONFIG_DYNAMIC_FTRACE
632 ifdef CONFIG_HAVE_C_RECORDMCOUNT
633 BUILD_C_RECORDMCOUNT := y
634 export BUILD_C_RECORDMCOUNT
635 endif
636 endif
637 endif
638
639 # We trigger additional mismatches with less inlining
640 ifdef CONFIG_DEBUG_SECTION_MISMATCH
641 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
642 endif
643
644 # arch Makefile may override CC so keep this after arch Makefile is included
645 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
646 CHECKFLAGS += $(NOSTDINC_FLAGS)
647
648 # warn about C99 declaration after statement
649 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
650
651 # disable pointer signed / unsigned warnings in gcc 4.0
652 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
653
654 # disable invalid "can't wrap" optimizations for signed / pointers
655 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
656
657 # conserve stack if available
658 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
659
660 # use the deterministic mode of AR if available
661 KBUILD_ARFLAGS := $(call ar-option,D)
662
663 # check for 'asm goto'
664 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
665 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
666 endif
667
668 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
669 KBUILD_CPPFLAGS += $(KCPPFLAGS)
670 KBUILD_AFLAGS += $(KAFLAGS)
671 KBUILD_CFLAGS += $(KCFLAGS)
672
673 # Use --build-id when available.
674 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
675 $(call cc-ldoption, -Wl$(comma)--build-id,))
676 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
677 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
678
679 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
680 LDFLAGS_vmlinux += $(call ld-option, -X,)
681 endif
682
683 # Default kernel image to build when no specific target is given.
684 # KBUILD_IMAGE may be overruled on the command line or
685 # set in the environment
686 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
687 # this default value
688 export KBUILD_IMAGE ?= vmlinux
689
690 #
691 # INSTALL_PATH specifies where to place the updated kernel and system map
692 # images. Default is /boot, but you can set it to other values
693 export INSTALL_PATH ?= /boot
694
695 #
696 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
697 # relocations required by build roots. This is not defined in the
698 # makefile but the argument can be passed to make if needed.
699 #
700
701 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
702 export MODLIB
703
704 #
705 # INSTALL_MOD_STRIP, if defined, will cause modules to be
706 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
707 # the default option --strip-debug will be used. Otherwise,
708 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
709
710 ifdef INSTALL_MOD_STRIP
711 ifeq ($(INSTALL_MOD_STRIP),1)
712 mod_strip_cmd = $(STRIP) --strip-debug
713 else
714 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
715 endif # INSTALL_MOD_STRIP=1
716 else
717 mod_strip_cmd = true
718 endif # INSTALL_MOD_STRIP
719 export mod_strip_cmd
720
721
722 ifeq ($(CONFIG_MODULE_SIG),y)
723 MODSECKEY = ./signing_key.priv
724 MODPUBKEY = ./signing_key.x509
725 export MODPUBKEY
726 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY)
727 else
728 mod_sign_cmd = true
729 endif
730 export mod_sign_cmd
731
732
733 ifeq ($(KBUILD_EXTMOD),)
734 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
735
736 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
737 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
738 $(net-y) $(net-m) $(libs-y) $(libs-m)))
739
740 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
741 $(init-n) $(init-) \
742 $(core-n) $(core-) $(drivers-n) $(drivers-) \
743 $(net-n) $(net-) $(libs-n) $(libs-))))
744
745 init-y := $(patsubst %/, %/built-in.o, $(init-y))
746 core-y := $(patsubst %/, %/built-in.o, $(core-y))
747 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
748 net-y := $(patsubst %/, %/built-in.o, $(net-y))
749 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
750 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
751 libs-y := $(libs-y1) $(libs-y2)
752
753 # Externally visible symbols (used by link-vmlinux.sh)
754 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
755 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
756 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
757 export LDFLAGS_vmlinux
758
759 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
760
761 # Final link of vmlinux
762 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
763 quiet_cmd_link-vmlinux = LINK $@
764
765 # Include targets which we want to
766 # execute if the rest of the kernel build went well.
767 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
768 ifdef CONFIG_HEADERS_CHECK
769 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
770 endif
771 ifdef CONFIG_SAMPLES
772 $(Q)$(MAKE) $(build)=samples
773 endif
774 ifdef CONFIG_BUILD_DOCSRC
775 $(Q)$(MAKE) $(build)=Documentation
776 endif
777 +$(call if_changed,link-vmlinux)
778
779 # The actual objects are generated when descending,
780 # make sure no implicit rule kicks in
781 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
782
783 # Handle descending into subdirectories listed in $(vmlinux-dirs)
784 # Preset locale variables to speed up the build process. Limit locale
785 # tweaks to this spot to avoid wrong language settings when running
786 # make menuconfig etc.
787 # Error messages still appears in the original language
788
789 PHONY += $(vmlinux-dirs)
790 $(vmlinux-dirs): prepare scripts
791 $(Q)$(MAKE) $(build)=$@
792
793 # Store (new) KERNELRELASE string in include/config/kernel.release
794 include/config/kernel.release: include/config/auto.conf FORCE
795 $(Q)rm -f $@
796 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
797
798
799 # Things we need to do before we recursively start building the kernel
800 # or the modules are listed in "prepare".
801 # A multi level approach is used. prepareN is processed before prepareN-1.
802 # archprepare is used in arch Makefiles and when processed asm symlink,
803 # version.h and scripts_basic is processed / created.
804
805 # Listed in dependency order
806 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
807
808 # prepare3 is used to check if we are building in a separate output directory,
809 # and if so do:
810 # 1) Check that make has not been executed in the kernel src $(srctree)
811 prepare3: include/config/kernel.release
812 ifneq ($(KBUILD_SRC),)
813 @$(kecho) ' Using $(srctree) as source for kernel'
814 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
815 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
816 echo >&2 " in the '$(srctree)' directory.";\
817 /bin/false; \
818 fi;
819 endif
820
821 # prepare2 creates a makefile if using a separate output directory
822 prepare2: prepare3 outputmakefile asm-generic
823
824 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
825 include/config/auto.conf
826 $(cmd_crmodverdir)
827
828 archprepare: archheaders archscripts prepare1 scripts_basic
829
830 prepare0: archprepare FORCE
831 $(Q)$(MAKE) $(build)=.
832
833 # All the preparing..
834 prepare: prepare0
835
836 # Generate some files
837 # ---------------------------------------------------------------------------
838
839 # KERNELRELEASE can change from a few different places, meaning version.h
840 # needs to be updated, so this check is forced on all builds
841
842 uts_len := 64
843 define filechk_utsrelease.h
844 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
845 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
846 exit 1; \
847 fi; \
848 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
849 endef
850
851 define filechk_version.h
852 (echo \#define LINUX_VERSION_CODE $(shell \
853 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
854 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
855 endef
856
857 $(version_h): $(srctree)/Makefile FORCE
858 $(call filechk,version.h)
859
860 include/generated/utsrelease.h: include/config/kernel.release FORCE
861 $(call filechk,utsrelease.h)
862
863 PHONY += headerdep
864 headerdep:
865 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
866 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
867
868 # ---------------------------------------------------------------------------
869
870 PHONY += depend dep
871 depend dep:
872 @echo '*** Warning: make $@ is unnecessary now.'
873
874 # ---------------------------------------------------------------------------
875 # Firmware install
876 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
877 export INSTALL_FW_PATH
878
879 PHONY += firmware_install
880 firmware_install: FORCE
881 @mkdir -p $(objtree)/firmware
882 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
883
884 # ---------------------------------------------------------------------------
885 # Kernel headers
886
887 #Default location for installed headers
888 export INSTALL_HDR_PATH = $(objtree)/usr
889
890 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
891
892 # If we do an all arch process set dst to asm-$(hdr-arch)
893 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
894
895 PHONY += archheaders
896 archheaders:
897
898 PHONY += archscripts
899 archscripts:
900
901 PHONY += __headers
902 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
903 $(Q)$(MAKE) $(build)=scripts build_unifdef
904
905 PHONY += headers_install_all
906 headers_install_all:
907 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
908
909 PHONY += headers_install
910 headers_install: __headers
911 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
912 $(error Headers not exportable for the $(SRCARCH) architecture))
913 $(Q)$(MAKE) $(hdr-inst)=include/uapi
914 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
915
916 PHONY += headers_check_all
917 headers_check_all: headers_install_all
918 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
919
920 PHONY += headers_check
921 headers_check: headers_install
922 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
923 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
924
925 # ---------------------------------------------------------------------------
926 # Modules
927
928 ifdef CONFIG_MODULES
929
930 # By default, build modules as well
931
932 all: modules
933
934 # Build modules
935 #
936 # A module can be listed more than once in obj-m resulting in
937 # duplicate lines in modules.order files. Those are removed
938 # using awk while concatenating to the final file.
939
940 PHONY += modules
941 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
942 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
943 @$(kecho) ' Building modules, stage 2.';
944 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
945 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
946
947 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
948 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
949
950 %/modules.builtin: include/config/auto.conf
951 $(Q)$(MAKE) $(modbuiltin)=$*
952
953
954 # Target to prepare building external modules
955 PHONY += modules_prepare
956 modules_prepare: prepare scripts
957
958 # Target to install modules
959 PHONY += modules_install
960 modules_install: _modinst_ _modinst_post
961
962 PHONY += _modinst_
963 _modinst_:
964 @rm -rf $(MODLIB)/kernel
965 @rm -f $(MODLIB)/source
966 @mkdir -p $(MODLIB)/kernel
967 @ln -s $(srctree) $(MODLIB)/source
968 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
969 rm -f $(MODLIB)/build ; \
970 ln -s $(objtree) $(MODLIB)/build ; \
971 fi
972 @cp -f $(objtree)/modules.order $(MODLIB)/
973 @cp -f $(objtree)/modules.builtin $(MODLIB)/
974 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
975
976 # This depmod is only for convenience to give the initial
977 # boot a modules.dep even before / is mounted read-write. However the
978 # boot script depmod is the master version.
979 PHONY += _modinst_post
980 _modinst_post: _modinst_
981 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
982 $(call cmd,depmod)
983
984 else # CONFIG_MODULES
985
986 # Modules not configured
987 # ---------------------------------------------------------------------------
988
989 modules modules_install: FORCE
990 @echo >&2
991 @echo >&2 "The present kernel configuration has modules disabled."
992 @echo >&2 "Type 'make config' and enable loadable module support."
993 @echo >&2 "Then build a kernel with module support enabled."
994 @echo >&2
995 @exit 1
996
997 endif # CONFIG_MODULES
998
999 ###
1000 # Cleaning is done on three levels.
1001 # make clean Delete most generated files
1002 # Leave enough to build external modules
1003 # make mrproper Delete the current configuration, and all generated files
1004 # make distclean Remove editor backup files, patch leftover files and the like
1005
1006 # Directories & files removed with 'make clean'
1007 CLEAN_DIRS += $(MODVERDIR)
1008
1009 # Directories & files removed with 'make mrproper'
1010 MRPROPER_DIRS += include/config usr/include include/generated \
1011 arch/*/include/generated
1012 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1013 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1014 signing_key.priv signing_key.x509 x509.genkey \
1015 extra_certificates signing_key.x509.keyid \
1016 signing_key.x509.signer
1017
1018 # clean - Delete most, but leave enough to build external modules
1019 #
1020 clean: rm-dirs := $(CLEAN_DIRS)
1021 clean: rm-files := $(CLEAN_FILES)
1022 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1023
1024 PHONY += $(clean-dirs) clean archclean
1025 $(clean-dirs):
1026 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1027
1028 clean: archclean
1029
1030 # mrproper - Delete all generated files, including .config
1031 #
1032 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1033 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1034 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1035
1036 PHONY += $(mrproper-dirs) mrproper archmrproper
1037 $(mrproper-dirs):
1038 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1039
1040 mrproper: clean archmrproper $(mrproper-dirs)
1041 $(call cmd,rmdirs)
1042 $(call cmd,rmfiles)
1043
1044 # distclean
1045 #
1046 PHONY += distclean
1047
1048 distclean: mrproper
1049 @find $(srctree) $(RCS_FIND_IGNORE) \
1050 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1051 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1052 -o -name '.*.rej' \
1053 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1054 -type f -print | xargs rm -f
1055
1056
1057 # Packaging of the kernel to various formats
1058 # ---------------------------------------------------------------------------
1059 # rpm target kept for backward compatibility
1060 package-dir := $(srctree)/scripts/package
1061
1062 %src-pkg: FORCE
1063 $(Q)$(MAKE) $(build)=$(package-dir) $@
1064 %pkg: include/config/kernel.release FORCE
1065 $(Q)$(MAKE) $(build)=$(package-dir) $@
1066 rpm: include/config/kernel.release FORCE
1067 $(Q)$(MAKE) $(build)=$(package-dir) $@
1068
1069
1070 # Brief documentation of the typical targets used
1071 # ---------------------------------------------------------------------------
1072
1073 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1074 boards := $(notdir $(boards))
1075 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1076 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1077
1078 help:
1079 @echo 'Cleaning targets:'
1080 @echo ' clean - Remove most generated files but keep the config and'
1081 @echo ' enough build support to build external modules'
1082 @echo ' mrproper - Remove all generated files + config + various backup files'
1083 @echo ' distclean - mrproper + remove editor backup and patch files'
1084 @echo ''
1085 @echo 'Configuration targets:'
1086 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1087 @echo ''
1088 @echo 'Other generic targets:'
1089 @echo ' all - Build all targets marked with [*]'
1090 @echo '* vmlinux - Build the bare kernel'
1091 @echo '* modules - Build all modules'
1092 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1093 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1094 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1095 @echo ' dir/ - Build all files in dir and below'
1096 @echo ' dir/file.[oisS] - Build specified target only'
1097 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1098 @echo ' (requires a recent binutils and recent build (System.map))'
1099 @echo ' dir/file.ko - Build module including final link'
1100 @echo ' modules_prepare - Set up for building external modules'
1101 @echo ' tags/TAGS - Generate tags file for editors'
1102 @echo ' cscope - Generate cscope index'
1103 @echo ' gtags - Generate GNU GLOBAL index'
1104 @echo ' kernelrelease - Output the release version string'
1105 @echo ' kernelversion - Output the version stored in Makefile'
1106 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1107 echo ' (default: $(INSTALL_HDR_PATH))'; \
1108 echo ''
1109 @echo 'Static analysers'
1110 @echo ' checkstack - Generate a list of stack hogs'
1111 @echo ' namespacecheck - Name space analysis on compiled kernel'
1112 @echo ' versioncheck - Sanity check on version.h usage'
1113 @echo ' includecheck - Check for duplicate included header files'
1114 @echo ' export_report - List the usages of all exported symbols'
1115 @echo ' headers_check - Sanity check on exported headers'
1116 @echo ' headerdep - Detect inclusion cycles in headers'
1117 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1118 @echo ''
1119 @echo 'Kernel packaging:'
1120 @$(MAKE) $(build)=$(package-dir) help
1121 @echo ''
1122 @echo 'Documentation targets:'
1123 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1124 @echo ''
1125 @echo 'Architecture specific targets ($(SRCARCH)):'
1126 @$(if $(archhelp),$(archhelp),\
1127 echo ' No architecture specific help defined for $(SRCARCH)')
1128 @echo ''
1129 @$(if $(boards), \
1130 $(foreach b, $(boards), \
1131 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1132 echo '')
1133 @$(if $(board-dirs), \
1134 $(foreach b, $(board-dirs), \
1135 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1136 printf " %-16s - Show all of the above\\n" help-boards; \
1137 echo '')
1138
1139 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1140 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1141 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1142 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1143 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1144 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1145 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1146 @echo ' 1: warnings which may be relevant and do not occur too often'
1147 @echo ' 2: warnings which occur quite often but may still be relevant'
1148 @echo ' 3: more obscure warnings, can most likely be ignored'
1149 @echo ' Multiple levels can be combined with W=12 or W=123'
1150 @echo ''
1151 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1152 @echo 'For further info see the ./README file'
1153
1154
1155 help-board-dirs := $(addprefix help-,$(board-dirs))
1156
1157 help-boards: $(help-board-dirs)
1158
1159 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1160
1161 $(help-board-dirs): help-%:
1162 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1163 @$(if $(boards-per-dir), \
1164 $(foreach b, $(boards-per-dir), \
1165 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1166 echo '')
1167
1168
1169 # Documentation targets
1170 # ---------------------------------------------------------------------------
1171 %docs: scripts_basic FORCE
1172 $(Q)$(MAKE) $(build)=scripts build_docproc
1173 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1174
1175 else # KBUILD_EXTMOD
1176
1177 ###
1178 # External module support.
1179 # When building external modules the kernel used as basis is considered
1180 # read-only, and no consistency checks are made and the make
1181 # system is not used on the basis kernel. If updates are required
1182 # in the basis kernel ordinary make commands (without M=...) must
1183 # be used.
1184 #
1185 # The following are the only valid targets when building external
1186 # modules.
1187 # make M=dir clean Delete all automatically generated files
1188 # make M=dir modules Make all modules in specified dir
1189 # make M=dir Same as 'make M=dir modules'
1190 # make M=dir modules_install
1191 # Install the modules built in the module directory
1192 # Assumes install directory is already created
1193
1194 # We are always building modules
1195 KBUILD_MODULES := 1
1196 PHONY += crmodverdir
1197 crmodverdir:
1198 $(cmd_crmodverdir)
1199
1200 PHONY += $(objtree)/Module.symvers
1201 $(objtree)/Module.symvers:
1202 @test -e $(objtree)/Module.symvers || ( \
1203 echo; \
1204 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1205 echo " is missing; modules will have no dependencies and modversions."; \
1206 echo )
1207
1208 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1209 PHONY += $(module-dirs) modules
1210 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1211 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1212
1213 modules: $(module-dirs)
1214 @$(kecho) ' Building modules, stage 2.';
1215 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1216
1217 PHONY += modules_install
1218 modules_install: _emodinst_ _emodinst_post
1219
1220 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1221 PHONY += _emodinst_
1222 _emodinst_:
1223 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1224 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1225
1226 PHONY += _emodinst_post
1227 _emodinst_post: _emodinst_
1228 $(call cmd,depmod)
1229
1230 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1231
1232 PHONY += $(clean-dirs) clean
1233 $(clean-dirs):
1234 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1235
1236 clean: rm-dirs := $(MODVERDIR)
1237 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1238
1239 help:
1240 @echo ' Building external modules.'
1241 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1242 @echo ''
1243 @echo ' modules - default target, build the module(s)'
1244 @echo ' modules_install - install the module'
1245 @echo ' clean - remove generated files in module directory only'
1246 @echo ''
1247
1248 # Dummies...
1249 PHONY += prepare scripts
1250 prepare: ;
1251 scripts: ;
1252 endif # KBUILD_EXTMOD
1253
1254 clean: $(clean-dirs)
1255 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1256 $(call cmd,rmdirs)
1257 $(call cmd,rmfiles)
1258 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1259 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1260 -o -name '*.ko.*' \
1261 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1262 -o -name '*.symtypes' -o -name 'modules.order' \
1263 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1264 -o -name '*.gcno' \) -type f -print | xargs rm -f
1265
1266 # Generate tags for editors
1267 # ---------------------------------------------------------------------------
1268 quiet_cmd_tags = GEN $@
1269 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1270
1271 tags TAGS cscope gtags: FORCE
1272 $(call cmd,tags)
1273
1274 # Scripts to check various things for consistency
1275 # ---------------------------------------------------------------------------
1276
1277 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1278
1279 includecheck:
1280 find $(srctree)/* $(RCS_FIND_IGNORE) \
1281 -name '*.[hcS]' -type f -print | sort \
1282 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1283
1284 versioncheck:
1285 find $(srctree)/* $(RCS_FIND_IGNORE) \
1286 -name '*.[hcS]' -type f -print | sort \
1287 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1288
1289 coccicheck:
1290 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1291
1292 namespacecheck:
1293 $(PERL) $(srctree)/scripts/namespace.pl
1294
1295 export_report:
1296 $(PERL) $(srctree)/scripts/export_report.pl
1297
1298 endif #ifeq ($(config-targets),1)
1299 endif #ifeq ($(mixed-targets),1)
1300
1301 PHONY += checkstack kernelrelease kernelversion
1302
1303 # UML needs a little special treatment here. It wants to use the host
1304 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1305 # else wants $(ARCH), including people doing cross-builds, which means
1306 # that $(SUBARCH) doesn't work here.
1307 ifeq ($(ARCH), um)
1308 CHECKSTACK_ARCH := $(SUBARCH)
1309 else
1310 CHECKSTACK_ARCH := $(ARCH)
1311 endif
1312 checkstack:
1313 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1314 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1315
1316 kernelrelease:
1317 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1318
1319 kernelversion:
1320 @echo $(KERNELVERSION)
1321
1322 # Clear a bunch of variables before executing the submake
1323 tools/: FORCE
1324 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1325
1326 tools/%: FORCE
1327 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1328
1329 # Single targets
1330 # ---------------------------------------------------------------------------
1331 # Single targets are compatible with:
1332 # - build with mixed source and output
1333 # - build with separate output dir 'make O=...'
1334 # - external modules
1335 #
1336 # target-dir => where to store outputfile
1337 # build-dir => directory in kernel source tree to use
1338
1339 ifeq ($(KBUILD_EXTMOD),)
1340 build-dir = $(patsubst %/,%,$(dir $@))
1341 target-dir = $(dir $@)
1342 else
1343 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1344 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1345 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1346 endif
1347
1348 %.s: %.c prepare scripts FORCE
1349 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1350 %.i: %.c prepare scripts FORCE
1351 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1352 %.o: %.c prepare scripts FORCE
1353 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1354 %.lst: %.c prepare scripts FORCE
1355 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1356 %.s: %.S prepare scripts FORCE
1357 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1358 %.o: %.S prepare scripts FORCE
1359 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1360 %.symtypes: %.c prepare scripts FORCE
1361 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1362
1363 # Modules
1364 /: prepare scripts FORCE
1365 $(cmd_crmodverdir)
1366 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1367 $(build)=$(build-dir)
1368 %/: prepare scripts FORCE
1369 $(cmd_crmodverdir)
1370 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1371 $(build)=$(build-dir)
1372 %.ko: prepare scripts FORCE
1373 $(cmd_crmodverdir)
1374 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1375 $(build)=$(build-dir) $(@:.ko=.o)
1376 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1377
1378 # FIXME Should go into a make.lib or something
1379 # ===========================================================================
1380
1381 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1382 cmd_rmdirs = rm -rf $(rm-dirs)
1383
1384 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1385 cmd_rmfiles = rm -f $(rm-files)
1386
1387 # Run depmod only if we have System.map and depmod is executable
1388 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1389 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1390 $(KERNELRELEASE)
1391
1392 # Create temporary dir for module support files
1393 # clean it up only when building all modules
1394 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1395 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1396
1397 # read all saved command lines
1398
1399 targets := $(wildcard $(sort $(targets)))
1400 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1401
1402 ifneq ($(cmd_files),)
1403 $(cmd_files): ; # Do not try to update included dependency files
1404 include $(cmd_files)
1405 endif
1406
1407 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1408 # Usage:
1409 # $(Q)$(MAKE) $(clean)=dir
1410 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1411
1412 endif # skip-makefile
1413
1414 PHONY += FORCE
1415 FORCE:
1416
1417 # Declare the contents of the .PHONY variable as phony. We keep that
1418 # information in a variable so we can use it in if_changed and friends.
1419 .PHONY: $(PHONY)