]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - Makefile
hwrng: core - sleep interruptible in read
[mirror_ubuntu-artful-kernel.git] / Makefile
1 VERSION = 4
2 PATCHLEVEL = 4
3 SUBLEVEL = 0
4 EXTRAVERSION = -rc1
5 NAME = Blurry Fish Butt
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 # SUBARCH tells the usermode build what the underlying arch is. That is set
219 # first, and if a usermode build is happening, the "ARCH=um" on the command
220 # line overrides the setting of ARCH below. If a native build is happening,
221 # then ARCH is assigned, getting whatever value it gets normally, and
222 # SUBARCH is subsequently ignored.
223
224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225 -e s/sun4u/sparc64/ \
226 -e s/arm.*/arm/ -e s/sa110/arm/ \
227 -e s/s390x/s390/ -e s/parisc64/parisc/ \
228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
230
231 # Cross compiling and selecting different set of gcc/bin-utils
232 # ---------------------------------------------------------------------------
233 #
234 # When performing cross compilation for other architectures ARCH shall be set
235 # to the target architecture. (See arch/* for the possibilities).
236 # ARCH can be set during invocation of make:
237 # make ARCH=ia64
238 # Another way is to have ARCH set in the environment.
239 # The default ARCH is the host where make is executed.
240
241 # CROSS_COMPILE specify the prefix used for all executables used
242 # during compilation. Only gcc and related bin-utils executables
243 # are prefixed with $(CROSS_COMPILE).
244 # CROSS_COMPILE can be set on the command line
245 # make CROSS_COMPILE=ia64-linux-
246 # Alternatively CROSS_COMPILE can be set in the environment.
247 # A third alternative is to store a setting in .config so that plain
248 # "make" in the configured kernel build directory always uses that.
249 # Default value for CROSS_COMPILE is not to prefix executables
250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
251 ARCH ?= $(SUBARCH)
252 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
253
254 # Architecture as present in compile.h
255 UTS_MACHINE := $(ARCH)
256 SRCARCH := $(ARCH)
257
258 # Additional ARCH settings for x86
259 ifeq ($(ARCH),i386)
260 SRCARCH := x86
261 endif
262 ifeq ($(ARCH),x86_64)
263 SRCARCH := x86
264 endif
265
266 # Additional ARCH settings for sparc
267 ifeq ($(ARCH),sparc32)
268 SRCARCH := sparc
269 endif
270 ifeq ($(ARCH),sparc64)
271 SRCARCH := sparc
272 endif
273
274 # Additional ARCH settings for sh
275 ifeq ($(ARCH),sh64)
276 SRCARCH := sh
277 endif
278
279 # Additional ARCH settings for tile
280 ifeq ($(ARCH),tilepro)
281 SRCARCH := tile
282 endif
283 ifeq ($(ARCH),tilegx)
284 SRCARCH := tile
285 endif
286
287 # Where to locate arch specific headers
288 hdr-arch := $(SRCARCH)
289
290 KCONFIG_CONFIG ?= .config
291 export KCONFIG_CONFIG
292
293 # SHELL used by kbuild
294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295 else if [ -x /bin/bash ]; then echo /bin/bash; \
296 else echo sh; fi ; fi)
297
298 HOSTCC = gcc
299 HOSTCXX = g++
300 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
301 HOSTCXXFLAGS = -O2
302
303 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306 endif
307
308 # Decide whether to build built-in, modular, or both.
309 # Normally, just do built-in.
310
311 KBUILD_MODULES :=
312 KBUILD_BUILTIN := 1
313
314 # If we have only "make modules", don't compile built-in objects.
315 # When we're building modules with modversions, we need to consider
316 # the built-in objects during the descend as well, in order to
317 # make sure the checksums are up to date before we record them.
318
319 ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321 endif
322
323 # If we have "make <whatever> modules", compile modules
324 # in addition to whatever we do anyway.
325 # Just "make" or "make all" shall build modules as well
326
327 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328 KBUILD_MODULES := 1
329 endif
330
331 ifeq ($(MAKECMDGOALS),)
332 KBUILD_MODULES := 1
333 endif
334
335 export KBUILD_MODULES KBUILD_BUILTIN
336 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
338 # We need some generic definitions (do not try to remake the file).
339 scripts/Kbuild.include: ;
340 include scripts/Kbuild.include
341
342 # Make variables (CC, etc...)
343 AS = $(CROSS_COMPILE)as
344 LD = $(CROSS_COMPILE)ld
345 CC = $(CROSS_COMPILE)gcc
346 CPP = $(CC) -E
347 AR = $(CROSS_COMPILE)ar
348 NM = $(CROSS_COMPILE)nm
349 STRIP = $(CROSS_COMPILE)strip
350 OBJCOPY = $(CROSS_COMPILE)objcopy
351 OBJDUMP = $(CROSS_COMPILE)objdump
352 AWK = awk
353 GENKSYMS = scripts/genksyms/genksyms
354 INSTALLKERNEL := installkernel
355 DEPMOD = /sbin/depmod
356 PERL = perl
357 PYTHON = python
358 CHECK = sparse
359
360 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361 -Wbitwise -Wno-return-void $(CF)
362 CFLAGS_MODULE =
363 AFLAGS_MODULE =
364 LDFLAGS_MODULE =
365 CFLAGS_KERNEL =
366 AFLAGS_KERNEL =
367 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
368
369
370 # Use USERINCLUDE when you must reference the UAPI directories only.
371 USERINCLUDE := \
372 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
373 -Iarch/$(hdr-arch)/include/generated/uapi \
374 -I$(srctree)/include/uapi \
375 -Iinclude/generated/uapi \
376 -include $(srctree)/include/linux/kconfig.h
377
378 # Use LINUXINCLUDE when you must reference the include/ directory.
379 # Needed to be compatible with the O= option
380 LINUXINCLUDE := \
381 -I$(srctree)/arch/$(hdr-arch)/include \
382 -Iarch/$(hdr-arch)/include/generated/uapi \
383 -Iarch/$(hdr-arch)/include/generated \
384 $(if $(KBUILD_SRC), -I$(srctree)/include) \
385 -Iinclude \
386 $(USERINCLUDE)
387
388 KBUILD_CPPFLAGS := -D__KERNEL__
389
390 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
391 -fno-strict-aliasing -fno-common \
392 -Werror-implicit-function-declaration \
393 -Wno-format-security \
394 -std=gnu89
395
396 KBUILD_AFLAGS_KERNEL :=
397 KBUILD_CFLAGS_KERNEL :=
398 KBUILD_AFLAGS := -D__ASSEMBLY__
399 KBUILD_AFLAGS_MODULE := -DMODULE
400 KBUILD_CFLAGS_MODULE := -DMODULE
401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
402
403 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
404 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
405 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
406
407 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
408 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
409 export CPP AR NM STRIP OBJCOPY OBJDUMP
410 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
411 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
412
413 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
414 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
415 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
416 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
417 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
418 export KBUILD_ARFLAGS
419
420 # When compiling out-of-tree modules, put MODVERDIR in the module
421 # tree rather than in the kernel tree. The kernel tree might
422 # even be read-only.
423 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
424
425 # Files to ignore in find ... statements
426
427 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
428 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
429 -prune -o
430 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
431 --exclude CVS --exclude .pc --exclude .hg --exclude .git
432
433 # ===========================================================================
434 # Rules shared between *config targets and build targets
435
436 # Basic helpers built in scripts/
437 PHONY += scripts_basic
438 scripts_basic:
439 $(Q)$(MAKE) $(build)=scripts/basic
440 $(Q)rm -f .tmp_quiet_recordmcount
441
442 # To avoid any implicit rule to kick in, define an empty command.
443 scripts/basic/%: scripts_basic ;
444
445 PHONY += outputmakefile
446 # outputmakefile generates a Makefile in the output directory, if using a
447 # separate output directory. This allows convenient use of make in the
448 # output directory.
449 outputmakefile:
450 ifneq ($(KBUILD_SRC),)
451 $(Q)ln -fsn $(srctree) source
452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
453 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
454 endif
455
456 # Support for using generic headers in asm-generic
457 PHONY += asm-generic
458 asm-generic:
459 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
460 src=asm obj=arch/$(SRCARCH)/include/generated/asm
461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
462 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
463
464 # To make sure we do not include .config for any of the *config targets
465 # catch them early, and hand them over to scripts/kconfig/Makefile
466 # It is allowed to specify more targets when calling make, including
467 # mixing *config targets and build targets.
468 # For example 'make oldconfig all'.
469 # Detect when mixed targets is specified, and make a second invocation
470 # of make so .config is not included in this case either (for *config).
471
472 version_h := include/generated/uapi/linux/version.h
473 old_version_h := include/linux/version.h
474
475 no-dot-config-targets := clean mrproper distclean \
476 cscope gtags TAGS tags help% %docs check% coccicheck \
477 $(version_h) headers_% archheaders archscripts \
478 kernelversion %src-pkg
479
480 config-targets := 0
481 mixed-targets := 0
482 dot-config := 1
483
484 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
485 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
486 dot-config := 0
487 endif
488 endif
489
490 ifeq ($(KBUILD_EXTMOD),)
491 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
492 config-targets := 1
493 ifneq ($(words $(MAKECMDGOALS)),1)
494 mixed-targets := 1
495 endif
496 endif
497 endif
498
499 ifeq ($(mixed-targets),1)
500 # ===========================================================================
501 # We're called with mixed targets (*config and build targets).
502 # Handle them one by one.
503
504 PHONY += $(MAKECMDGOALS) __build_one_by_one
505
506 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
507 @:
508
509 __build_one_by_one:
510 $(Q)set -e; \
511 for i in $(MAKECMDGOALS); do \
512 $(MAKE) -f $(srctree)/Makefile $$i; \
513 done
514
515 else
516 ifeq ($(config-targets),1)
517 # ===========================================================================
518 # *config targets only - make sure prerequisites are updated, and descend
519 # in scripts/kconfig to make the *config target
520
521 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
522 # KBUILD_DEFCONFIG may point out an alternative default configuration
523 # used for 'make defconfig'
524 include arch/$(SRCARCH)/Makefile
525 export KBUILD_DEFCONFIG KBUILD_KCONFIG
526
527 config: scripts_basic outputmakefile FORCE
528 $(Q)$(MAKE) $(build)=scripts/kconfig $@
529
530 %config: scripts_basic outputmakefile FORCE
531 $(Q)$(MAKE) $(build)=scripts/kconfig $@
532
533 else
534 # ===========================================================================
535 # Build targets only - this includes vmlinux, arch specific targets, clean
536 # targets and others. In general all targets except *config targets.
537
538 ifeq ($(KBUILD_EXTMOD),)
539 # Additional helpers built in scripts/
540 # Carefully list dependencies so we do not try to build scripts twice
541 # in parallel
542 PHONY += scripts
543 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
544 asm-generic
545 $(Q)$(MAKE) $(build)=$(@)
546
547 # Objects we will link into vmlinux / subdirs we need to visit
548 init-y := init/
549 drivers-y := drivers/ sound/ firmware/
550 net-y := net/
551 libs-y := lib/
552 core-y := usr/
553 virt-y := virt/
554 endif # KBUILD_EXTMOD
555
556 ifeq ($(dot-config),1)
557 # Read in config
558 -include include/config/auto.conf
559
560 ifeq ($(KBUILD_EXTMOD),)
561 # Read in dependencies to all Kconfig* files, make sure to run
562 # oldconfig if changes are detected.
563 -include include/config/auto.conf.cmd
564
565 # To avoid any implicit rule to kick in, define an empty command
566 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
567
568 # If .config is newer than include/config/auto.conf, someone tinkered
569 # with it and forgot to run make oldconfig.
570 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
571 # we execute the config step to be sure to catch updated Kconfig files
572 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
573 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
574 else
575 # external modules needs include/generated/autoconf.h and include/config/auto.conf
576 # but do not care if they are up-to-date. Use auto.conf to trigger the test
577 PHONY += include/config/auto.conf
578
579 include/config/auto.conf:
580 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
581 echo >&2; \
582 echo >&2 " ERROR: Kernel configuration is invalid."; \
583 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
584 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
585 echo >&2 ; \
586 /bin/false)
587
588 endif # KBUILD_EXTMOD
589
590 else
591 # Dummy target needed, because used as prerequisite
592 include/config/auto.conf: ;
593 endif # $(dot-config)
594
595 # The all: target is the default when no target is given on the
596 # command line.
597 # This allow a user to issue only 'make' to build a kernel including modules
598 # Defaults to vmlinux, but the arch makefile usually adds further targets
599 all: vmlinux
600
601 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
602 # values of the respective KBUILD_* variables
603 ARCH_CPPFLAGS :=
604 ARCH_AFLAGS :=
605 ARCH_CFLAGS :=
606 include arch/$(SRCARCH)/Makefile
607
608 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
609
610 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
611 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
612 else
613 KBUILD_CFLAGS += -O2
614 endif
615
616 # Tell gcc to never replace conditional load with a non-conditional one
617 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
618
619 ifdef CONFIG_READABLE_ASM
620 # Disable optimizations that make assembler listings hard to read.
621 # reorder blocks reorders the control in the function
622 # ipa clone creates specialized cloned functions
623 # partial inlining inlines only parts of functions
624 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
625 $(call cc-option,-fno-ipa-cp-clone,) \
626 $(call cc-option,-fno-partial-inlining)
627 endif
628
629 ifneq ($(CONFIG_FRAME_WARN),0)
630 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
631 endif
632
633 # Handle stack protector mode.
634 #
635 # Since kbuild can potentially perform two passes (first with the old
636 # .config values and then with updated .config values), we cannot error out
637 # if a desired compiler option is unsupported. If we were to error, kbuild
638 # could never get to the second pass and actually notice that we changed
639 # the option to something that was supported.
640 #
641 # Additionally, we don't want to fallback and/or silently change which compiler
642 # flags will be used, since that leads to producing kernels with different
643 # security feature characteristics depending on the compiler used. ("But I
644 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
645 #
646 # The middle ground is to warn here so that the failed option is obvious, but
647 # to let the build fail with bad compiler flags so that we can't produce a
648 # kernel when there is a CONFIG and compiler mismatch.
649 #
650 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
651 stackp-flag := -fstack-protector
652 ifeq ($(call cc-option, $(stackp-flag)),)
653 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
654 -fstack-protector not supported by compiler)
655 endif
656 else
657 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
658 stackp-flag := -fstack-protector-strong
659 ifeq ($(call cc-option, $(stackp-flag)),)
660 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
661 -fstack-protector-strong not supported by compiler)
662 endif
663 else
664 # Force off for distro compilers that enable stack protector by default.
665 stackp-flag := $(call cc-option, -fno-stack-protector)
666 endif
667 endif
668 KBUILD_CFLAGS += $(stackp-flag)
669
670 ifeq ($(cc-name),clang)
671 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
672 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
673 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
674 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
675 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
676 # Quiet clang warning: comparison of unsigned expression < 0 is always false
677 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
678 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
679 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
680 # See modpost pattern 2
681 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
682 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
683 else
684
685 # This warning generated too much noise in a regular build.
686 # Use make W=1 to enable this warning (see scripts/Makefile.build)
687 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
688 endif
689
690 ifdef CONFIG_FRAME_POINTER
691 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
692 else
693 # Some targets (ARM with Thumb2, for example), can't be built with frame
694 # pointers. For those, we don't have FUNCTION_TRACER automatically
695 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
696 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
697 # -fomit-frame-pointer with FUNCTION_TRACER.
698 ifndef CONFIG_FUNCTION_TRACER
699 KBUILD_CFLAGS += -fomit-frame-pointer
700 endif
701 endif
702
703 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
704
705 ifdef CONFIG_DEBUG_INFO
706 ifdef CONFIG_DEBUG_INFO_SPLIT
707 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
708 else
709 KBUILD_CFLAGS += -g
710 endif
711 KBUILD_AFLAGS += -Wa,-gdwarf-2
712 endif
713 ifdef CONFIG_DEBUG_INFO_DWARF4
714 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
715 endif
716
717 ifdef CONFIG_DEBUG_INFO_REDUCED
718 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
719 $(call cc-option,-fno-var-tracking)
720 endif
721
722 ifdef CONFIG_FUNCTION_TRACER
723 ifndef CC_FLAGS_FTRACE
724 CC_FLAGS_FTRACE := -pg
725 endif
726 export CC_FLAGS_FTRACE
727 ifdef CONFIG_HAVE_FENTRY
728 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729 endif
730 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
731 KBUILD_AFLAGS += $(CC_USING_FENTRY)
732 ifdef CONFIG_DYNAMIC_FTRACE
733 ifdef CONFIG_HAVE_C_RECORDMCOUNT
734 BUILD_C_RECORDMCOUNT := y
735 export BUILD_C_RECORDMCOUNT
736 endif
737 endif
738 endif
739
740 # We trigger additional mismatches with less inlining
741 ifdef CONFIG_DEBUG_SECTION_MISMATCH
742 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
743 endif
744
745 # arch Makefile may override CC so keep this after arch Makefile is included
746 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
747 CHECKFLAGS += $(NOSTDINC_FLAGS)
748
749 # warn about C99 declaration after statement
750 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
751
752 # disable pointer signed / unsigned warnings in gcc 4.0
753 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
754
755 # disable invalid "can't wrap" optimizations for signed / pointers
756 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
757
758 # conserve stack if available
759 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
760
761 # disallow errors like 'EXPORT_GPL(foo);' with missing header
762 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
763
764 # require functions to have arguments in prototypes, not empty 'int foo()'
765 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
766
767 # Prohibit date/time macros, which would make the build non-deterministic
768 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
769
770 # use the deterministic mode of AR if available
771 KBUILD_ARFLAGS := $(call ar-option,D)
772
773 # check for 'asm goto'
774 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
775 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
776 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
777 endif
778
779 include scripts/Makefile.kasan
780 include scripts/Makefile.extrawarn
781
782 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
783 # last assignments
784 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
785 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
786 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
787
788 # Use --build-id when available.
789 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
790 $(call cc-ldoption, -Wl$(comma)--build-id,))
791 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
792 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
793
794 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
795 LDFLAGS_vmlinux += $(call ld-option, -X,)
796 endif
797
798 # Default kernel image to build when no specific target is given.
799 # KBUILD_IMAGE may be overruled on the command line or
800 # set in the environment
801 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
802 # this default value
803 export KBUILD_IMAGE ?= vmlinux
804
805 #
806 # INSTALL_PATH specifies where to place the updated kernel and system map
807 # images. Default is /boot, but you can set it to other values
808 export INSTALL_PATH ?= /boot
809
810 #
811 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
812 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
813 # an argument if needed. Otherwise it defaults to the kernel install path
814 #
815 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
816
817 #
818 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
819 # relocations required by build roots. This is not defined in the
820 # makefile but the argument can be passed to make if needed.
821 #
822
823 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
824 export MODLIB
825
826 #
827 # INSTALL_MOD_STRIP, if defined, will cause modules to be
828 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
829 # the default option --strip-debug will be used. Otherwise,
830 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
831
832 ifdef INSTALL_MOD_STRIP
833 ifeq ($(INSTALL_MOD_STRIP),1)
834 mod_strip_cmd = $(STRIP) --strip-debug
835 else
836 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
837 endif # INSTALL_MOD_STRIP=1
838 else
839 mod_strip_cmd = true
840 endif # INSTALL_MOD_STRIP
841 export mod_strip_cmd
842
843 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
844 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
845 # or CONFIG_MODULE_COMPRESS_XZ.
846
847 mod_compress_cmd = true
848 ifdef CONFIG_MODULE_COMPRESS
849 ifdef CONFIG_MODULE_COMPRESS_GZIP
850 mod_compress_cmd = gzip -n -f
851 endif # CONFIG_MODULE_COMPRESS_GZIP
852 ifdef CONFIG_MODULE_COMPRESS_XZ
853 mod_compress_cmd = xz -f
854 endif # CONFIG_MODULE_COMPRESS_XZ
855 endif # CONFIG_MODULE_COMPRESS
856 export mod_compress_cmd
857
858 # Select initial ramdisk compression format, default is gzip(1).
859 # This shall be used by the dracut(8) tool while creating an initramfs image.
860 #
861 INITRD_COMPRESS-y := gzip
862 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
863 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
864 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
865 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
866 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
867 # do not export INITRD_COMPRESS, since we didn't actually
868 # choose a sane default compression above.
869 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
870
871 ifdef CONFIG_MODULE_SIG_ALL
872 $(eval $(call config_filename,MODULE_SIG_KEY))
873
874 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
875 else
876 mod_sign_cmd = true
877 endif
878 export mod_sign_cmd
879
880
881 ifeq ($(KBUILD_EXTMOD),)
882 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
883
884 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
885 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
886 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
887
888 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
889 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
890
891 init-y := $(patsubst %/, %/built-in.o, $(init-y))
892 core-y := $(patsubst %/, %/built-in.o, $(core-y))
893 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
894 net-y := $(patsubst %/, %/built-in.o, $(net-y))
895 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
896 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
897 libs-y := $(libs-y1) $(libs-y2)
898 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
899
900 # Externally visible symbols (used by link-vmlinux.sh)
901 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
902 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
903 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
904 export LDFLAGS_vmlinux
905 # used by scripts/pacmage/Makefile
906 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
907
908 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
909
910 # Final link of vmlinux
911 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
912 quiet_cmd_link-vmlinux = LINK $@
913
914 # Include targets which we want to
915 # execute if the rest of the kernel build went well.
916 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
917 ifdef CONFIG_HEADERS_CHECK
918 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
919 endif
920 ifdef CONFIG_SAMPLES
921 $(Q)$(MAKE) $(build)=samples
922 endif
923 ifdef CONFIG_BUILD_DOCSRC
924 $(Q)$(MAKE) $(build)=Documentation
925 endif
926 ifdef CONFIG_GDB_SCRIPTS
927 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
928 endif
929 +$(call if_changed,link-vmlinux)
930
931 # The actual objects are generated when descending,
932 # make sure no implicit rule kicks in
933 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
934
935 # Handle descending into subdirectories listed in $(vmlinux-dirs)
936 # Preset locale variables to speed up the build process. Limit locale
937 # tweaks to this spot to avoid wrong language settings when running
938 # make menuconfig etc.
939 # Error messages still appears in the original language
940
941 PHONY += $(vmlinux-dirs)
942 $(vmlinux-dirs): prepare scripts
943 $(Q)$(MAKE) $(build)=$@
944
945 define filechk_kernel.release
946 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
947 endef
948
949 # Store (new) KERNELRELEASE string in include/config/kernel.release
950 include/config/kernel.release: include/config/auto.conf FORCE
951 $(call filechk,kernel.release)
952
953
954 # Things we need to do before we recursively start building the kernel
955 # or the modules are listed in "prepare".
956 # A multi level approach is used. prepareN is processed before prepareN-1.
957 # archprepare is used in arch Makefiles and when processed asm symlink,
958 # version.h and scripts_basic is processed / created.
959
960 # Listed in dependency order
961 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
962
963 # prepare3 is used to check if we are building in a separate output directory,
964 # and if so do:
965 # 1) Check that make has not been executed in the kernel src $(srctree)
966 prepare3: include/config/kernel.release
967 ifneq ($(KBUILD_SRC),)
968 @$(kecho) ' Using $(srctree) as source for kernel'
969 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
970 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
971 echo >&2 " in the '$(srctree)' directory.";\
972 /bin/false; \
973 fi;
974 endif
975
976 # prepare2 creates a makefile if using a separate output directory
977 prepare2: prepare3 outputmakefile asm-generic
978
979 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
980 include/config/auto.conf
981 $(cmd_crmodverdir)
982
983 archprepare: archheaders archscripts prepare1 scripts_basic
984
985 prepare0: archprepare FORCE
986 $(Q)$(MAKE) $(build)=.
987
988 # All the preparing..
989 prepare: prepare0
990
991 # Generate some files
992 # ---------------------------------------------------------------------------
993
994 # KERNELRELEASE can change from a few different places, meaning version.h
995 # needs to be updated, so this check is forced on all builds
996
997 uts_len := 64
998 define filechk_utsrelease.h
999 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1000 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1001 exit 1; \
1002 fi; \
1003 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004 endef
1005
1006 define filechk_version.h
1007 (echo \#define LINUX_VERSION_CODE $(shell \
1008 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1009 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010 endef
1011
1012 $(version_h): $(srctree)/Makefile FORCE
1013 $(call filechk,version.h)
1014 $(Q)rm -f $(old_version_h)
1015
1016 include/generated/utsrelease.h: include/config/kernel.release FORCE
1017 $(call filechk,utsrelease.h)
1018
1019 PHONY += headerdep
1020 headerdep:
1021 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1022 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1023
1024 # ---------------------------------------------------------------------------
1025 # Firmware install
1026 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1027 export INSTALL_FW_PATH
1028
1029 PHONY += firmware_install
1030 firmware_install: FORCE
1031 @mkdir -p $(objtree)/firmware
1032 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1033
1034 # ---------------------------------------------------------------------------
1035 # Kernel headers
1036
1037 #Default location for installed headers
1038 export INSTALL_HDR_PATH = $(objtree)/usr
1039
1040 # If we do an all arch process set dst to asm-$(hdr-arch)
1041 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1042
1043 PHONY += archheaders
1044 archheaders:
1045
1046 PHONY += archscripts
1047 archscripts:
1048
1049 PHONY += __headers
1050 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1051 $(Q)$(MAKE) $(build)=scripts build_unifdef
1052
1053 PHONY += headers_install_all
1054 headers_install_all:
1055 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1056
1057 PHONY += headers_install
1058 headers_install: __headers
1059 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1060 $(error Headers not exportable for the $(SRCARCH) architecture))
1061 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1062 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1063
1064 PHONY += headers_check_all
1065 headers_check_all: headers_install_all
1066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1067
1068 PHONY += headers_check
1069 headers_check: headers_install
1070 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1071 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1072
1073 # ---------------------------------------------------------------------------
1074 # Kernel selftest
1075
1076 PHONY += kselftest
1077 kselftest:
1078 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1079
1080 kselftest-clean:
1081 $(Q)$(MAKE) -C tools/testing/selftests clean
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.pem signing_key.priv signing_key.x509 \
1179 x509.genkey 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 ' kselftest-clean - Remove all generated kselftest files'
1291 @echo ''
1292 @echo 'Kernel packaging:'
1293 @$(MAKE) $(build)=$(package-dir) help
1294 @echo ''
1295 @echo 'Documentation targets:'
1296 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1297 @echo ''
1298 @echo 'Architecture specific targets ($(SRCARCH)):'
1299 @$(if $(archhelp),$(archhelp),\
1300 echo ' No architecture specific help defined for $(SRCARCH)')
1301 @echo ''
1302 @$(if $(boards), \
1303 $(foreach b, $(boards), \
1304 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1305 echo '')
1306 @$(if $(board-dirs), \
1307 $(foreach b, $(board-dirs), \
1308 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1309 printf " %-16s - Show all of the above\\n" help-boards; \
1310 echo '')
1311
1312 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1313 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1314 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1315 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1316 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1317 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1318 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1319 @echo ' 1: warnings which may be relevant and do not occur too often'
1320 @echo ' 2: warnings which occur quite often but may still be relevant'
1321 @echo ' 3: more obscure warnings, can most likely be ignored'
1322 @echo ' Multiple levels can be combined with W=12 or W=123'
1323 @echo ''
1324 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1325 @echo 'For further info see the ./README file'
1326
1327
1328 help-board-dirs := $(addprefix help-,$(board-dirs))
1329
1330 help-boards: $(help-board-dirs)
1331
1332 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1333
1334 $(help-board-dirs): help-%:
1335 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1336 @$(if $(boards-per-dir), \
1337 $(foreach b, $(boards-per-dir), \
1338 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1339 echo '')
1340
1341
1342 # Documentation targets
1343 # ---------------------------------------------------------------------------
1344 %docs: scripts_basic FORCE
1345 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1346 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1347
1348 else # KBUILD_EXTMOD
1349
1350 ###
1351 # External module support.
1352 # When building external modules the kernel used as basis is considered
1353 # read-only, and no consistency checks are made and the make
1354 # system is not used on the basis kernel. If updates are required
1355 # in the basis kernel ordinary make commands (without M=...) must
1356 # be used.
1357 #
1358 # The following are the only valid targets when building external
1359 # modules.
1360 # make M=dir clean Delete all automatically generated files
1361 # make M=dir modules Make all modules in specified dir
1362 # make M=dir Same as 'make M=dir modules'
1363 # make M=dir modules_install
1364 # Install the modules built in the module directory
1365 # Assumes install directory is already created
1366
1367 # We are always building modules
1368 KBUILD_MODULES := 1
1369 PHONY += crmodverdir
1370 crmodverdir:
1371 $(cmd_crmodverdir)
1372
1373 PHONY += $(objtree)/Module.symvers
1374 $(objtree)/Module.symvers:
1375 @test -e $(objtree)/Module.symvers || ( \
1376 echo; \
1377 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1378 echo " is missing; modules will have no dependencies and modversions."; \
1379 echo )
1380
1381 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1382 PHONY += $(module-dirs) modules
1383 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1384 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1385
1386 modules: $(module-dirs)
1387 @$(kecho) ' Building modules, stage 2.';
1388 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1389
1390 PHONY += modules_install
1391 modules_install: _emodinst_ _emodinst_post
1392
1393 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1394 PHONY += _emodinst_
1395 _emodinst_:
1396 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1397 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1398
1399 PHONY += _emodinst_post
1400 _emodinst_post: _emodinst_
1401 $(call cmd,depmod)
1402
1403 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1404
1405 PHONY += $(clean-dirs) clean
1406 $(clean-dirs):
1407 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1408
1409 clean: rm-dirs := $(MODVERDIR)
1410 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1411
1412 help:
1413 @echo ' Building external modules.'
1414 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1415 @echo ''
1416 @echo ' modules - default target, build the module(s)'
1417 @echo ' modules_install - install the module'
1418 @echo ' clean - remove generated files in module directory only'
1419 @echo ''
1420
1421 # Dummies...
1422 PHONY += prepare scripts
1423 prepare: ;
1424 scripts: ;
1425 endif # KBUILD_EXTMOD
1426
1427 clean: $(clean-dirs)
1428 $(call cmd,rmdirs)
1429 $(call cmd,rmfiles)
1430 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1431 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1432 -o -name '*.ko.*' \
1433 -o -name '*.dwo' \
1434 -o -name '*.su' \
1435 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1436 -o -name '*.symtypes' -o -name 'modules.order' \
1437 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1438 -o -name '*.gcno' \) -type f -print | xargs rm -f
1439
1440 # Generate tags for editors
1441 # ---------------------------------------------------------------------------
1442 quiet_cmd_tags = GEN $@
1443 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1444
1445 tags TAGS cscope gtags: FORCE
1446 $(call cmd,tags)
1447
1448 # Scripts to check various things for consistency
1449 # ---------------------------------------------------------------------------
1450
1451 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1452
1453 includecheck:
1454 find $(srctree)/* $(RCS_FIND_IGNORE) \
1455 -name '*.[hcS]' -type f -print | sort \
1456 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1457
1458 versioncheck:
1459 find $(srctree)/* $(RCS_FIND_IGNORE) \
1460 -name '*.[hcS]' -type f -print | sort \
1461 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1462
1463 coccicheck:
1464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1465
1466 namespacecheck:
1467 $(PERL) $(srctree)/scripts/namespace.pl
1468
1469 export_report:
1470 $(PERL) $(srctree)/scripts/export_report.pl
1471
1472 endif #ifeq ($(config-targets),1)
1473 endif #ifeq ($(mixed-targets),1)
1474
1475 PHONY += checkstack kernelrelease kernelversion image_name
1476
1477 # UML needs a little special treatment here. It wants to use the host
1478 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1479 # else wants $(ARCH), including people doing cross-builds, which means
1480 # that $(SUBARCH) doesn't work here.
1481 ifeq ($(ARCH), um)
1482 CHECKSTACK_ARCH := $(SUBARCH)
1483 else
1484 CHECKSTACK_ARCH := $(ARCH)
1485 endif
1486 checkstack:
1487 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1488 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1489
1490 kernelrelease:
1491 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1492
1493 kernelversion:
1494 @echo $(KERNELVERSION)
1495
1496 image_name:
1497 @echo $(KBUILD_IMAGE)
1498
1499 # Clear a bunch of variables before executing the submake
1500 tools/: FORCE
1501 $(Q)mkdir -p $(objtree)/tools
1502 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1503
1504 tools/%: FORCE
1505 $(Q)mkdir -p $(objtree)/tools
1506 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1507
1508 # Single targets
1509 # ---------------------------------------------------------------------------
1510 # Single targets are compatible with:
1511 # - build with mixed source and output
1512 # - build with separate output dir 'make O=...'
1513 # - external modules
1514 #
1515 # target-dir => where to store outputfile
1516 # build-dir => directory in kernel source tree to use
1517
1518 ifeq ($(KBUILD_EXTMOD),)
1519 build-dir = $(patsubst %/,%,$(dir $@))
1520 target-dir = $(dir $@)
1521 else
1522 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1523 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1524 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1525 endif
1526
1527 %.s: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.i: %.c prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.o: %.c prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.lst: %.c prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535 %.s: %.S prepare scripts FORCE
1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 %.o: %.S prepare scripts FORCE
1538 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539 %.symtypes: %.c prepare scripts FORCE
1540 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1541
1542 # Modules
1543 /: prepare scripts FORCE
1544 $(cmd_crmodverdir)
1545 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1546 $(build)=$(build-dir)
1547 # Make sure the latest headers are built for Documentation
1548 Documentation/: headers_install
1549 %/: prepare scripts FORCE
1550 $(cmd_crmodverdir)
1551 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1552 $(build)=$(build-dir)
1553 %.ko: prepare scripts FORCE
1554 $(cmd_crmodverdir)
1555 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1556 $(build)=$(build-dir) $(@:.ko=.o)
1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1558
1559 # FIXME Should go into a make.lib or something
1560 # ===========================================================================
1561
1562 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1563 cmd_rmdirs = rm -rf $(rm-dirs)
1564
1565 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1566 cmd_rmfiles = rm -f $(rm-files)
1567
1568 # Run depmod only if we have System.map and depmod is executable
1569 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1570 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1571 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1572
1573 # Create temporary dir for module support files
1574 # clean it up only when building all modules
1575 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1576 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1577
1578 # read all saved command lines
1579
1580 targets := $(wildcard $(sort $(targets)))
1581 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1582
1583 ifneq ($(cmd_files),)
1584 $(cmd_files): ; # Do not try to update included dependency files
1585 include $(cmd_files)
1586 endif
1587
1588 endif # skip-makefile
1589
1590 PHONY += FORCE
1591 FORCE:
1592
1593 # Declare the contents of the .PHONY variable as phony. We keep that
1594 # information in a variable so we can use it in if_changed and friends.
1595 .PHONY: $(PHONY)