]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - Makefile
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[mirror_ubuntu-bionic-kernel.git] / Makefile
1 VERSION = 2
2 PATCHLEVEL = 6
3 SUBLEVEL = 28
4 EXTRAVERSION =
5 NAME = Erotic Pickled Herring
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 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
21 #
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
28 # is now up to date.
29 #
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
33 # prepare rule.
34
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
37
38 ifdef V
39 ifeq ("$(origin V)", "command line")
40 KBUILD_VERBOSE = $(V)
41 endif
42 endif
43 ifndef KBUILD_VERBOSE
44 KBUILD_VERBOSE = 0
45 endif
46
47 # Call a source code checker (by default, "sparse") as part of the
48 # C compilation.
49 #
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
53 #
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
56
57 ifdef C
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
60 endif
61 endif
62 ifndef KBUILD_CHECKSRC
63 KBUILD_CHECKSRC = 0
64 endif
65
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
69 ifdef SUBDIRS
70 KBUILD_EXTMOD ?= $(SUBDIRS)
71 endif
72 ifdef M
73 ifeq ("$(origin M)", "command line")
74 KBUILD_EXTMOD := $(M)
75 endif
76 endif
77
78
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
82 # 1) O=
83 # Use "make O=dir/to/store/output/files/"
84 #
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
89 # make
90 #
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
92 # variable.
93
94
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
97 ifeq ($(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 ifdef O
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
104 endif
105 endif
106
107 # That's our default target when none is given on the command line
108 PHONY := _all
109 _all:
110
111 # Cancel implicit rules on top Makefile
112 $(CURDIR)/Makefile Makefile: ;
113
114 ifneq ($(KBUILD_OUTPUT),)
115 # Invoke a second make in the output directory, passing relevant variables
116 # check that the output directory actually exists
117 saved-output := $(KBUILD_OUTPUT)
118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119 $(if $(KBUILD_OUTPUT),, \
120 $(error output directory "$(saved-output)" does not exist))
121
122 PHONY += $(MAKECMDGOALS) sub-make
123
124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
125 $(Q)@:
126
127 sub-make: FORCE
128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
132
133 # Leave processing to above invocation of make
134 skip-makefile := 1
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
137
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile),)
140
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
143 PHONY += all
144 ifeq ($(KBUILD_EXTMOD),)
145 _all: all
146 else
147 _all: modules
148 endif
149
150 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
151 TOPDIR := $(srctree)
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
153 objtree := $(CURDIR)
154 src := $(srctree)
155 obj := $(objtree)
156
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159 export srctree objtree VPATH TOPDIR
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.*/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 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192 export KBUILD_BUILDHOST := $(SUBARCH)
193 ARCH ?= $(SUBARCH)
194 CROSS_COMPILE ?=
195
196 # Architecture as present in compile.h
197 UTS_MACHINE := $(ARCH)
198 SRCARCH := $(ARCH)
199
200 # Additional ARCH settings for x86
201 ifeq ($(ARCH),i386)
202 SRCARCH := x86
203 endif
204 ifeq ($(ARCH),x86_64)
205 SRCARCH := x86
206 endif
207
208 # Additional ARCH settings for sparc
209 ifeq ($(ARCH),sparc64)
210 SRCARCH := sparc
211 endif
212
213 # Where to locate arch specific headers
214 hdr-arch := $(SRCARCH)
215
216 KCONFIG_CONFIG ?= .config
217
218 # SHELL used by kbuild
219 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
220 else if [ -x /bin/bash ]; then echo /bin/bash; \
221 else echo sh; fi ; fi)
222
223 HOSTCC = gcc
224 HOSTCXX = g++
225 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
226 HOSTCXXFLAGS = -O2
227
228 # Decide whether to build built-in, modular, or both.
229 # Normally, just do built-in.
230
231 KBUILD_MODULES :=
232 KBUILD_BUILTIN := 1
233
234 # If we have only "make modules", don't compile built-in objects.
235 # When we're building modules with modversions, we need to consider
236 # the built-in objects during the descend as well, in order to
237 # make sure the checksums are up to date before we record them.
238
239 ifeq ($(MAKECMDGOALS),modules)
240 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
241 endif
242
243 # If we have "make <whatever> modules", compile modules
244 # in addition to whatever we do anyway.
245 # Just "make" or "make all" shall build modules as well
246
247 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
248 KBUILD_MODULES := 1
249 endif
250
251 ifeq ($(MAKECMDGOALS),)
252 KBUILD_MODULES := 1
253 endif
254
255 export KBUILD_MODULES KBUILD_BUILTIN
256 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
257
258 # Beautify output
259 # ---------------------------------------------------------------------------
260 #
261 # Normally, we echo the whole command before executing it. By making
262 # that echo $($(quiet)$(cmd)), we now have the possibility to set
263 # $(quiet) to choose other forms of output instead, e.g.
264 #
265 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
266 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
267 #
268 # If $(quiet) is empty, the whole command will be printed.
269 # If it is set to "quiet_", only the short version will be printed.
270 # If it is set to "silent_", nothing will be printed at all, since
271 # the variable $(silent_cmd_cc_o_c) doesn't exist.
272 #
273 # A simple variant is to prefix commands with $(Q) - that's useful
274 # for commands that shall be hidden in non-verbose mode.
275 #
276 # $(Q)ln $@ :<
277 #
278 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
279 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
280
281 ifeq ($(KBUILD_VERBOSE),1)
282 quiet =
283 Q =
284 else
285 quiet=quiet_
286 Q = @
287 endif
288
289 # If the user is running make -s (silent mode), suppress echoing of
290 # commands
291
292 ifneq ($(findstring s,$(MAKEFLAGS)),)
293 quiet=silent_
294 endif
295
296 export quiet Q KBUILD_VERBOSE
297
298
299 # Look for make include files relative to root of kernel src
300 MAKEFLAGS += --include-dir=$(srctree)
301
302 # We need some generic definitions (do not try to remake the file).
303 $(srctree)/scripts/Kbuild.include: ;
304 include $(srctree)/scripts/Kbuild.include
305
306 # Make variables (CC, etc...)
307
308 AS = $(CROSS_COMPILE)as
309 LD = $(CROSS_COMPILE)ld
310 CC = $(CROSS_COMPILE)gcc
311 CPP = $(CC) -E
312 AR = $(CROSS_COMPILE)ar
313 NM = $(CROSS_COMPILE)nm
314 STRIP = $(CROSS_COMPILE)strip
315 OBJCOPY = $(CROSS_COMPILE)objcopy
316 OBJDUMP = $(CROSS_COMPILE)objdump
317 AWK = awk
318 GENKSYMS = scripts/genksyms/genksyms
319 DEPMOD = /sbin/depmod
320 KALLSYMS = scripts/kallsyms
321 PERL = perl
322 CHECK = sparse
323
324 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
325 -Wbitwise -Wno-return-void $(CF)
326 MODFLAGS = -DMODULE
327 CFLAGS_MODULE = $(MODFLAGS)
328 AFLAGS_MODULE = $(MODFLAGS)
329 LDFLAGS_MODULE =
330 CFLAGS_KERNEL =
331 AFLAGS_KERNEL =
332
333
334 # Use LINUXINCLUDE when you must reference the include/ directory.
335 # Needed to be compatible with the O= option
336 LINUXINCLUDE := -Iinclude \
337 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
338 -I$(srctree)/arch/$(hdr-arch)/include \
339 -include include/linux/autoconf.h
340
341 KBUILD_CPPFLAGS := -D__KERNEL__
342
343 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
344 -fno-strict-aliasing -fno-common \
345 -Werror-implicit-function-declaration
346 KBUILD_AFLAGS := -D__ASSEMBLY__
347
348 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
349 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
350 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
351
352 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
353 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
354 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
355 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
356
357 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
358 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
359 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
360
361 # When compiling out-of-tree modules, put MODVERDIR in the module
362 # tree rather than in the kernel tree. The kernel tree might
363 # even be read-only.
364 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
365
366 # Files to ignore in find ... statements
367
368 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
369 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
370
371 # ===========================================================================
372 # Rules shared between *config targets and build targets
373
374 # Basic helpers built in scripts/
375 PHONY += scripts_basic
376 scripts_basic:
377 $(Q)$(MAKE) $(build)=scripts/basic
378
379 # To avoid any implicit rule to kick in, define an empty command.
380 scripts/basic/%: scripts_basic ;
381
382 PHONY += outputmakefile
383 # outputmakefile generates a Makefile in the output directory, if using a
384 # separate output directory. This allows convenient use of make in the
385 # output directory.
386 outputmakefile:
387 ifneq ($(KBUILD_SRC),)
388 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
389 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
390 endif
391
392 # To make sure we do not include .config for any of the *config targets
393 # catch them early, and hand them over to scripts/kconfig/Makefile
394 # It is allowed to specify more targets when calling make, including
395 # mixing *config targets and build targets.
396 # For example 'make oldconfig all'.
397 # Detect when mixed targets is specified, and make a second invocation
398 # of make so .config is not included in this case either (for *config).
399
400 no-dot-config-targets := clean mrproper distclean \
401 cscope TAGS tags help %docs check% \
402 include/linux/version.h headers_% \
403 kernelrelease kernelversion
404
405 config-targets := 0
406 mixed-targets := 0
407 dot-config := 1
408
409 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
410 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
411 dot-config := 0
412 endif
413 endif
414
415 ifeq ($(KBUILD_EXTMOD),)
416 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
417 config-targets := 1
418 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
419 mixed-targets := 1
420 endif
421 endif
422 endif
423
424 ifeq ($(mixed-targets),1)
425 # ===========================================================================
426 # We're called with mixed targets (*config and build targets).
427 # Handle them one by one.
428
429 %:: FORCE
430 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
431
432 else
433 ifeq ($(config-targets),1)
434 # ===========================================================================
435 # *config targets only - make sure prerequisites are updated, and descend
436 # in scripts/kconfig to make the *config target
437
438 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
439 # KBUILD_DEFCONFIG may point out an alternative default configuration
440 # used for 'make defconfig'
441 include $(srctree)/arch/$(SRCARCH)/Makefile
442 export KBUILD_DEFCONFIG KBUILD_KCONFIG
443
444 config: scripts_basic outputmakefile FORCE
445 $(Q)mkdir -p include/linux include/config
446 $(Q)$(MAKE) $(build)=scripts/kconfig $@
447
448 %config: scripts_basic outputmakefile FORCE
449 $(Q)mkdir -p include/linux include/config
450 $(Q)$(MAKE) $(build)=scripts/kconfig $@
451
452 else
453 # ===========================================================================
454 # Build targets only - this includes vmlinux, arch specific targets, clean
455 # targets and others. In general all targets except *config targets.
456
457 ifeq ($(KBUILD_EXTMOD),)
458 # Additional helpers built in scripts/
459 # Carefully list dependencies so we do not try to build scripts twice
460 # in parallel
461 PHONY += scripts
462 scripts: scripts_basic include/config/auto.conf
463 $(Q)$(MAKE) $(build)=$(@)
464
465 # Objects we will link into vmlinux / subdirs we need to visit
466 init-y := init/
467 drivers-y := drivers/ sound/ firmware/
468 net-y := net/
469 libs-y := lib/
470 core-y := usr/
471 endif # KBUILD_EXTMOD
472
473 ifeq ($(dot-config),1)
474 # Read in config
475 -include include/config/auto.conf
476
477 ifeq ($(KBUILD_EXTMOD),)
478 # Read in dependencies to all Kconfig* files, make sure to run
479 # oldconfig if changes are detected.
480 -include include/config/auto.conf.cmd
481
482 # To avoid any implicit rule to kick in, define an empty command
483 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
484
485 # If .config is newer than include/config/auto.conf, someone tinkered
486 # with it and forgot to run make oldconfig.
487 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
488 # we execute the config step to be sure to catch updated Kconfig files
489 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
490 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
491 else
492 # external modules needs include/linux/autoconf.h and include/config/auto.conf
493 # but do not care if they are up-to-date. Use auto.conf to trigger the test
494 PHONY += include/config/auto.conf
495
496 include/config/auto.conf:
497 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
498 echo; \
499 echo " ERROR: Kernel configuration is invalid."; \
500 echo " include/linux/autoconf.h or $@ are missing."; \
501 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
502 echo; \
503 /bin/false)
504
505 endif # KBUILD_EXTMOD
506
507 else
508 # Dummy target needed, because used as prerequisite
509 include/config/auto.conf: ;
510 endif # $(dot-config)
511
512 # The all: target is the default when no target is given on the
513 # command line.
514 # This allow a user to issue only 'make' to build a kernel including modules
515 # Defaults vmlinux but it is usually overridden in the arch makefile
516 all: vmlinux
517
518 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
519 KBUILD_CFLAGS += -Os
520 else
521 KBUILD_CFLAGS += -O2
522 endif
523
524 include $(srctree)/arch/$(SRCARCH)/Makefile
525
526 ifneq (CONFIG_FRAME_WARN,0)
527 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
528 endif
529
530 # Force gcc to behave correct even for buggy distributions
531 # Arch Makefiles may override this setting
532 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
533
534 ifdef CONFIG_FRAME_POINTER
535 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
536 else
537 KBUILD_CFLAGS += -fomit-frame-pointer
538 endif
539
540 ifdef CONFIG_DEBUG_INFO
541 KBUILD_CFLAGS += -g
542 KBUILD_AFLAGS += -gdwarf-2
543 endif
544
545 ifdef CONFIG_FUNCTION_TRACER
546 KBUILD_CFLAGS += -pg
547 endif
548
549 # We trigger additional mismatches with less inlining
550 ifdef CONFIG_DEBUG_SECTION_MISMATCH
551 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
552 endif
553
554 # arch Makefile may override CC so keep this after arch Makefile is included
555 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
556 CHECKFLAGS += $(NOSTDINC_FLAGS)
557
558 # warn about C99 declaration after statement
559 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
560
561 # disable pointer signed / unsigned warnings in gcc 4.0
562 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
563
564 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
565 # But warn user when we do so
566 warn-assign = \
567 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
568
569 ifneq ($(KCPPFLAGS),)
570 $(call warn-assign,CPPFLAGS)
571 KBUILD_CPPFLAGS += $(KCPPFLAGS)
572 endif
573 ifneq ($(KAFLAGS),)
574 $(call warn-assign,AFLAGS)
575 KBUILD_AFLAGS += $(KAFLAGS)
576 endif
577 ifneq ($(KCFLAGS),)
578 $(call warn-assign,CFLAGS)
579 KBUILD_CFLAGS += $(KCFLAGS)
580 endif
581
582 # Use --build-id when available.
583 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
584 $(call ld-option, -Wl$(comma)--build-id,))
585 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
586 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
587
588 # Default kernel image to build when no specific target is given.
589 # KBUILD_IMAGE may be overruled on the command line or
590 # set in the environment
591 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
592 # this default value
593 export KBUILD_IMAGE ?= vmlinux
594
595 #
596 # INSTALL_PATH specifies where to place the updated kernel and system map
597 # images. Default is /boot, but you can set it to other values
598 export INSTALL_PATH ?= /boot
599
600 #
601 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
602 # relocations required by build roots. This is not defined in the
603 # makefile but the argument can be passed to make if needed.
604 #
605
606 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
607 export MODLIB
608
609 strip-symbols := $(srctree)/scripts/strip-symbols \
610 $(wildcard $(srctree)/arch/$(ARCH)/scripts/strip-symbols)
611
612 #
613 # INSTALL_MOD_STRIP, if defined, will cause modules to be stripped while
614 # they get installed. If INSTALL_MOD_STRIP is '1', then the default
615 # options (see below) will be used. Otherwise, INSTALL_MOD_STRIP will
616 # be used as the option(s) to the objcopy command.
617 ifdef INSTALL_MOD_STRIP
618 ifeq ($(INSTALL_MOD_STRIP),1)
619 mod_strip_cmd = $(OBJCOPY) --strip-debug
620 ifeq ($(CONFIG_KALLSYMS_ALL),$(CONFIG_KALLSYMS_STRIP_GENERATED))
621 mod_strip_cmd += --wildcard $(addprefix --strip-symbols ,$(strip-symbols))
622 endif
623 else
624 mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
625 endif # INSTALL_MOD_STRIP=1
626 else
627 mod_strip_cmd = false
628 endif # INSTALL_MOD_STRIP
629 export mod_strip_cmd
630
631
632 ifeq ($(KBUILD_EXTMOD),)
633 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
634
635 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
636 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
637 $(net-y) $(net-m) $(libs-y) $(libs-m)))
638
639 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
640 $(init-n) $(init-) \
641 $(core-n) $(core-) $(drivers-n) $(drivers-) \
642 $(net-n) $(net-) $(libs-n) $(libs-))))
643
644 init-y := $(patsubst %/, %/built-in.o, $(init-y))
645 core-y := $(patsubst %/, %/built-in.o, $(core-y))
646 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
647 net-y := $(patsubst %/, %/built-in.o, $(net-y))
648 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
649 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
650 libs-y := $(libs-y1) $(libs-y2)
651
652 # Build vmlinux
653 # ---------------------------------------------------------------------------
654 # vmlinux is built from the objects selected by $(vmlinux-init) and
655 # $(vmlinux-main). Most are built-in.o files from top-level directories
656 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
657 # Ordering when linking is important, and $(vmlinux-init) must be first.
658 #
659 # vmlinux
660 # ^
661 # |
662 # +-< $(vmlinux-init)
663 # | +--< init/version.o + more
664 # |
665 # +--< $(vmlinux-main)
666 # | +--< driver/built-in.o mm/built-in.o + more
667 # |
668 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
669 #
670 # vmlinux version (uname -v) cannot be updated during normal
671 # descending-into-subdirs phase since we do not yet know if we need to
672 # update vmlinux.
673 # Therefore this step is delayed until just before final link of vmlinux -
674 # except in the kallsyms case where it is done just before adding the
675 # symbols to the kernel.
676 #
677 # System.map is generated to document addresses of all kernel symbols
678
679 vmlinux-init := $(head-y) $(init-y)
680 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
681 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
682 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
683 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
684
685 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
686 # May be overridden by arch/$(ARCH)/Makefile
687 quiet_cmd_vmlinux__ ?= LD $@
688 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
689 -T $(vmlinux-lds) $(vmlinux-init) \
690 --start-group $(vmlinux-main) --end-group \
691 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
692
693 # Generate new vmlinux version
694 quiet_cmd_vmlinux_version = GEN .version
695 cmd_vmlinux_version = set -e; \
696 if [ ! -r .version ]; then \
697 rm -f .version; \
698 echo 1 >.version; \
699 else \
700 mv .version .old_version; \
701 expr 0$$(cat .old_version) + 1 >.version; \
702 fi; \
703 $(MAKE) $(build)=init
704
705 # Generate System.map
706 quiet_cmd_sysmap = SYSMAP
707 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
708
709 # Link of vmlinux
710 # If CONFIG_KALLSYMS is set .version is already updated
711 # Generate System.map and verify that the content is consistent
712 # Use + in front of the vmlinux_version rule to silent warning with make -j2
713 # First command is ':' to allow us to use + in front of the rule
714 define rule_vmlinux__
715 :
716 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
717
718 $(call cmd,vmlinux__)
719 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
720
721 $(Q)$(if $($(quiet)cmd_sysmap), \
722 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
723 $(cmd_sysmap) $@ System.map; \
724 if [ $$? -ne 0 ]; then \
725 rm -f $@; \
726 /bin/false; \
727 fi;
728 $(verify_kallsyms)
729 endef
730
731
732 ifdef CONFIG_KALLSYMS
733 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
734 # It's a three stage process:
735 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
736 # empty
737 # Running kallsyms on that gives us .tmp_kallsyms1.o with
738 # the right size - vmlinux version (uname -v) is updated during this step
739 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
740 # but due to the added section, some addresses have shifted.
741 # From here, we generate a correct .tmp_kallsyms2.o
742 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
743 # o Verify that the System.map from vmlinux matches the map from
744 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
745 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
746 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
747 # temporary bypass to allow the kernel to be built while the
748 # maintainers work out what went wrong with kallsyms.
749
750 ifdef CONFIG_KALLSYMS_EXTRA_PASS
751 last_kallsyms := 3
752 else
753 last_kallsyms := 2
754 endif
755
756 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
757 kallsyms.h := $(wildcard include/config/kallsyms/*.h) $(wildcard include/config/kallsyms/*/*.h)
758
759 define verify_kallsyms
760 $(Q)$(if $($(quiet)cmd_sysmap), \
761 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
762 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
763 $(Q)cmp -s System.map .tmp_System.map || \
764 (echo Inconsistent kallsyms data; \
765 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
766 rm .tmp_kallsyms* ; /bin/false )
767 endef
768
769 # Update vmlinux version before link
770 # Use + in front of this rule to silent warning about make -j1
771 # First command is ':' to allow us to use + in front of this rule
772 cmd_ksym_ld = $(cmd_vmlinux__)
773 define rule_ksym_ld
774 :
775 +$(call cmd,vmlinux_version)
776 $(call cmd,vmlinux__)
777 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
778 endef
779
780 # Generate .S file with all kernel symbols
781 quiet_cmd_kallsyms = KSYM $@
782 cmd_kallsyms = { test $* -eq 0 || $(NM) -n $<; } \
783 | $(KALLSYMS) $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) >$@
784
785 quiet_cmd_kstrip = STRIP $@
786 cmd_kstrip = $(OBJCOPY) --wildcard $(addprefix --strip$(if $(CONFIG_RELOCATABLE),-unneeded)-symbols ,$(filter %/scripts/strip-symbols,$^)) $< $@
787
788 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): KBUILD_AFLAGS += -Wa,--strip-local-absolute
789 $(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): %.o: %.S scripts FORCE
790 $(call if_changed_dep,as_o_S)
791
792 ifeq ($(CONFIG_KALLSYMS_STRIP_GENERATED),y)
793 strip-ext := .stripped
794 endif
795
796 .tmp_kallsyms%.S: .tmp_vmlinux%$(strip-ext) $(KALLSYMS) $(kallsyms.h)
797 $(call cmd,kallsyms)
798
799 # make -jN seems to have problems with intermediate files, see bug #3330.
800 .SECONDARY: $(foreach n,1 2 3,.tmp_vmlinux$(n).stripped)
801 .tmp_vmlinux%.stripped: .tmp_vmlinux% $(strip-symbols) $(kallsyms.h)
802 $(call cmd,kstrip)
803
804 ifneq ($(CONFIG_DEBUG_INFO),y)
805 .tmp_vmlinux%: LDFLAGS_vmlinux += -S
806 endif
807 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
808 .tmp_vmlinux%: $(vmlinux-lds) $(vmlinux-all) FORCE
809 $(if $(filter 1,$*),$(call if_changed_rule,ksym_ld),$(call if_changed,vmlinux__))
810
811 .tmp_vmlinux0$(strip-ext):
812 $(Q)echo "placeholder" >$@
813
814 .tmp_vmlinux1: .tmp_kallsyms0.o
815 .tmp_vmlinux2: .tmp_kallsyms1.o
816 .tmp_vmlinux3: .tmp_kallsyms2.o
817
818 # Needs to visit scripts/ before $(KALLSYMS) can be used.
819 $(KALLSYMS): scripts ;
820
821 # Generate some data for debugging strange kallsyms problems
822 debug_kallsyms: .tmp_map$(last_kallsyms)
823
824 .tmp_map%: .tmp_vmlinux% FORCE
825 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
826
827 .tmp_map3: .tmp_map2
828
829 .tmp_map2: .tmp_map1
830
831 endif # ifdef CONFIG_KALLSYMS
832
833 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
834 # relevant sections renamed as per the linker script.
835 quiet_cmd_vmlinux-modpost = LD $@
836 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
837 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
838 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
839 define rule_vmlinux-modpost
840 :
841 +$(call cmd,vmlinux-modpost)
842 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
843 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
844 endef
845
846 # vmlinux image - including updated kernel symbols
847 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
848 ifdef CONFIG_HEADERS_CHECK
849 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
850 endif
851 ifdef CONFIG_SAMPLES
852 $(Q)$(MAKE) $(build)=samples
853 endif
854 ifdef CONFIG_BUILD_DOCSRC
855 $(Q)$(MAKE) $(build)=Documentation
856 endif
857 $(call vmlinux-modpost)
858 $(call if_changed_rule,vmlinux__)
859 $(Q)rm -f .old_version
860
861 # build vmlinux.o first to catch section mismatch errors early
862 ifdef CONFIG_KALLSYMS
863 .tmp_vmlinux1: vmlinux.o
864 endif
865
866 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
867 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
868 $(call if_changed_rule,vmlinux-modpost)
869
870 # The actual objects are generated when descending,
871 # make sure no implicit rule kicks in
872 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
873
874 # Handle descending into subdirectories listed in $(vmlinux-dirs)
875 # Preset locale variables to speed up the build process. Limit locale
876 # tweaks to this spot to avoid wrong language settings when running
877 # make menuconfig etc.
878 # Error messages still appears in the original language
879
880 PHONY += $(vmlinux-dirs)
881 $(vmlinux-dirs): prepare scripts
882 $(Q)$(MAKE) $(build)=$@
883
884 # Build the kernel release string
885 #
886 # The KERNELRELEASE value built here is stored in the file
887 # include/config/kernel.release, and is used when executing several
888 # make targets, such as "make install" or "make modules_install."
889 #
890 # The eventual kernel release string consists of the following fields,
891 # shown in a hierarchical format to show how smaller parts are concatenated
892 # to form the larger and final value, with values coming from places like
893 # the Makefile, kernel config options, make command line options and/or
894 # SCM tag information.
895 #
896 # $(KERNELVERSION)
897 # $(VERSION) eg, 2
898 # $(PATCHLEVEL) eg, 6
899 # $(SUBLEVEL) eg, 18
900 # $(EXTRAVERSION) eg, -rc6
901 # $(localver-full)
902 # $(localver)
903 # localversion* (files without backups, containing '~')
904 # $(CONFIG_LOCALVERSION) (from kernel config setting)
905 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
906 # ./scripts/setlocalversion (SCM tag, if one exists)
907 # $(LOCALVERSION) (from make command line if provided)
908 #
909 # Note how the final $(localver-auto) string is included *only* if the
910 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
911 # moment, only git is supported but other SCMs can edit the script
912 # scripts/setlocalversion and add the appropriate checks as needed.
913
914 pattern = ".*/localversion[^~]*"
915 string = $(shell cat /dev/null \
916 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
917
918 localver = $(subst $(space),, $(string) \
919 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
920
921 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
922 # and if the SCM is know a tag from the SCM is appended.
923 # The appended tag is determined by the SCM used.
924 #
925 # Currently, only git is supported.
926 # Other SCMs can edit scripts/setlocalversion and add the appropriate
927 # checks as needed.
928 ifdef CONFIG_LOCALVERSION_AUTO
929 _localver-auto = $(shell $(CONFIG_SHELL) \
930 $(srctree)/scripts/setlocalversion $(srctree))
931 localver-auto = $(LOCALVERSION)$(_localver-auto)
932 endif
933
934 localver-full = $(localver)$(localver-auto)
935
936 # Store (new) KERNELRELASE string in include/config/kernel.release
937 kernelrelease = $(KERNELVERSION)$(localver-full)
938 include/config/kernel.release: include/config/auto.conf FORCE
939 $(Q)rm -f $@
940 $(Q)echo $(kernelrelease) > $@
941
942
943 # Things we need to do before we recursively start building the kernel
944 # or the modules are listed in "prepare".
945 # A multi level approach is used. prepareN is processed before prepareN-1.
946 # archprepare is used in arch Makefiles and when processed asm symlink,
947 # version.h and scripts_basic is processed / created.
948
949 # Listed in dependency order
950 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
951
952 # prepare3 is used to check if we are building in a separate output directory,
953 # and if so do:
954 # 1) Check that make has not been executed in the kernel src $(srctree)
955 # 2) Create the include2 directory, used for the second asm symlink
956 prepare3: include/config/kernel.release
957 ifneq ($(KBUILD_SRC),)
958 @$(kecho) ' Using $(srctree) as source for kernel'
959 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
960 echo " $(srctree) is not clean, please run 'make mrproper'";\
961 echo " in the '$(srctree)' directory.";\
962 /bin/false; \
963 fi;
964 $(Q)if [ ! -d include2 ]; then \
965 mkdir -p include2; \
966 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
967 fi
968 ln -fsn $(srctree) source
969 endif
970
971 # prepare2 creates a makefile if using a separate output directory
972 prepare2: prepare3 outputmakefile
973
974 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
975 include/asm include/config/auto.conf
976 $(cmd_crmodverdir)
977
978 archprepare: prepare1 scripts_basic
979
980 prepare0: archprepare FORCE
981 $(Q)$(MAKE) $(build)=.
982 $(Q)$(MAKE) $(build)=. missing-syscalls
983
984 # All the preparing..
985 prepare: prepare0
986
987 # Leave this as default for preprocessing vmlinux.lds.S, which is now
988 # done in arch/$(ARCH)/kernel/Makefile
989
990 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
991
992 # The asm symlink changes when $(ARCH) changes.
993 # Detect this and ask user to run make mrproper
994 # If asm is a stale symlink (point to dir that does not exist) remove it
995 define check-symlink
996 set -e; \
997 if [ -L include/asm ]; then \
998 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
999 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
1000 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1001 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1002 exit 1; \
1003 fi; \
1004 test -e $$asmlink || rm include/asm; \
1005 elif [ -d include/asm ]; then \
1006 echo "ERROR: $@ is a directory but a symlink was expected";\
1007 exit 1; \
1008 fi
1009 endef
1010
1011 # We create the target directory of the symlink if it does
1012 # not exist so the test in check-symlink works and we have a
1013 # directory for generated filesas used by some architectures.
1014 define create-symlink
1015 if [ ! -L include/asm ]; then \
1016 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1017 if [ ! -d include/asm-$(SRCARCH) ]; then \
1018 mkdir -p include/asm-$(SRCARCH); \
1019 fi; \
1020 ln -fsn asm-$(SRCARCH) $@; \
1021 fi
1022 endef
1023
1024 include/asm: FORCE
1025 $(Q)$(check-symlink)
1026 $(Q)$(create-symlink)
1027
1028 # Generate some files
1029 # ---------------------------------------------------------------------------
1030
1031 # KERNELRELEASE can change from a few different places, meaning version.h
1032 # needs to be updated, so this check is forced on all builds
1033
1034 uts_len := 64
1035 define filechk_utsrelease.h
1036 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1037 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1038 exit 1; \
1039 fi; \
1040 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1041 endef
1042
1043 define filechk_version.h
1044 (echo \#define LINUX_VERSION_CODE $(shell \
1045 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1046 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1047 endef
1048
1049 include/linux/version.h: $(srctree)/Makefile FORCE
1050 $(call filechk,version.h)
1051
1052 include/linux/utsrelease.h: include/config/kernel.release FORCE
1053 $(call filechk,utsrelease.h)
1054
1055 PHONY += headerdep
1056 headerdep:
1057 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1058
1059 # ---------------------------------------------------------------------------
1060
1061 PHONY += depend dep
1062 depend dep:
1063 @echo '*** Warning: make $@ is unnecessary now.'
1064
1065 # ---------------------------------------------------------------------------
1066 # Firmware install
1067 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1068 export INSTALL_FW_PATH
1069
1070 PHONY += firmware_install
1071 firmware_install: FORCE
1072 @mkdir -p $(objtree)/firmware
1073 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1074
1075 # ---------------------------------------------------------------------------
1076 # Kernel headers
1077
1078 #Default location for installed headers
1079 export INSTALL_HDR_PATH = $(objtree)/usr
1080
1081 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1082 # Find out where the Kbuild file is located to support
1083 # arch/$(ARCH)/include/asm
1084 hdr-dir = $(strip \
1085 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1086 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1087
1088 # If we do an all arch process set dst to asm-$(hdr-arch)
1089 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1090
1091 PHONY += __headers
1092 __headers: include/linux/version.h scripts_basic FORCE
1093 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1094
1095 PHONY += headers_install_all
1096 headers_install_all:
1097 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1098
1099 PHONY += headers_install
1100 headers_install: __headers
1101 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1102 $(error Headers not exportable for the $(SRCARCH) architecture))
1103 $(Q)$(MAKE) $(hdr-inst)=include
1104 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1105
1106 PHONY += headers_check_all
1107 headers_check_all: headers_install_all
1108 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1109
1110 PHONY += headers_check
1111 headers_check: headers_install
1112 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1113 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1114
1115 # ---------------------------------------------------------------------------
1116 # Modules
1117
1118 ifdef CONFIG_MODULES
1119
1120 # By default, build modules as well
1121
1122 all: modules
1123
1124 # Build modules
1125 #
1126 # A module can be listed more than once in obj-m resulting in
1127 # duplicate lines in modules.order files. Those are removed
1128 # using awk while concatenating to the final file.
1129
1130 PHONY += modules
1131 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1132 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1133 @$(kecho) ' Building modules, stage 2.';
1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1136
1137
1138 # Target to prepare building external modules
1139 PHONY += modules_prepare
1140 modules_prepare: prepare scripts
1141
1142 # Target to install modules
1143 PHONY += modules_install
1144 modules_install: _modinst_ _modinst_post
1145
1146 PHONY += _modinst_
1147 _modinst_:
1148 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1149 echo "Warning: you may need to install module-init-tools"; \
1150 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1151 sleep 1; \
1152 fi
1153 @rm -rf $(MODLIB)/kernel
1154 @rm -f $(MODLIB)/source
1155 @mkdir -p $(MODLIB)/kernel
1156 @ln -s $(srctree) $(MODLIB)/source
1157 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1158 rm -f $(MODLIB)/build ; \
1159 ln -s $(objtree) $(MODLIB)/build ; \
1160 fi
1161 @cp -f $(objtree)/modules.order $(MODLIB)/
1162 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1163
1164 # This depmod is only for convenience to give the initial
1165 # boot a modules.dep even before / is mounted read-write. However the
1166 # boot script depmod is the master version.
1167 PHONY += _modinst_post
1168 _modinst_post: _modinst_
1169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1170 $(call cmd,depmod)
1171
1172 else # CONFIG_MODULES
1173
1174 # Modules not configured
1175 # ---------------------------------------------------------------------------
1176
1177 modules modules_install: FORCE
1178 @echo
1179 @echo "The present kernel configuration has modules disabled."
1180 @echo "Type 'make config' and enable loadable module support."
1181 @echo "Then build a kernel with module support enabled."
1182 @echo
1183 @exit 1
1184
1185 endif # CONFIG_MODULES
1186
1187 ###
1188 # Cleaning is done on three levels.
1189 # make clean Delete most generated files
1190 # Leave enough to build external modules
1191 # make mrproper Delete the current configuration, and all generated files
1192 # make distclean Remove editor backup files, patch leftover files and the like
1193
1194 # Directories & files removed with 'make clean'
1195 CLEAN_DIRS += $(MODVERDIR)
1196 CLEAN_FILES += vmlinux System.map \
1197 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1198
1199 # Directories & files removed with 'make mrproper'
1200 MRPROPER_DIRS += include/config include2 usr/include
1201 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1202 include/linux/autoconf.h include/linux/version.h \
1203 include/linux/utsrelease.h \
1204 include/linux/bounds.h include/asm*/asm-offsets.h \
1205 Module.symvers Module.markers tags TAGS cscope*
1206
1207 # clean - Delete most, but leave enough to build external modules
1208 #
1209 clean: rm-dirs := $(CLEAN_DIRS)
1210 clean: rm-files := $(CLEAN_FILES)
1211 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1212
1213 PHONY += $(clean-dirs) clean archclean
1214 $(clean-dirs):
1215 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1216
1217 clean: archclean $(clean-dirs)
1218 $(call cmd,rmdirs)
1219 $(call cmd,rmfiles)
1220 @find . $(RCS_FIND_IGNORE) \
1221 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1222 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1223 -o -name '*.symtypes' -o -name 'modules.order' \
1224 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1225 -type f -print | xargs rm -f
1226
1227 # mrproper - Delete all generated files, including .config
1228 #
1229 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1230 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1231 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1232
1233 PHONY += $(mrproper-dirs) mrproper archmrproper
1234 $(mrproper-dirs):
1235 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1236
1237 mrproper: clean archmrproper $(mrproper-dirs)
1238 $(call cmd,rmdirs)
1239 $(call cmd,rmfiles)
1240
1241 # distclean
1242 #
1243 PHONY += distclean
1244
1245 distclean: mrproper
1246 @find $(srctree) $(RCS_FIND_IGNORE) \
1247 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1248 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1249 -o -name '.*.rej' -o -size 0 \
1250 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1251 -type f -print | xargs rm -f
1252
1253
1254 # Packaging of the kernel to various formats
1255 # ---------------------------------------------------------------------------
1256 # rpm target kept for backward compatibility
1257 package-dir := $(srctree)/scripts/package
1258
1259 %pkg: include/config/kernel.release FORCE
1260 $(Q)$(MAKE) $(build)=$(package-dir) $@
1261 rpm: include/config/kernel.release FORCE
1262 $(Q)$(MAKE) $(build)=$(package-dir) $@
1263
1264
1265 # Brief documentation of the typical targets used
1266 # ---------------------------------------------------------------------------
1267
1268 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1269 boards := $(notdir $(boards))
1270 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1271 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1272
1273 help:
1274 @echo 'Cleaning targets:'
1275 @echo ' clean - Remove most generated files but keep the config and'
1276 @echo ' enough build support to build external modules'
1277 @echo ' mrproper - Remove all generated files + config + various backup files'
1278 @echo ' distclean - mrproper + remove editor backup and patch files'
1279 @echo ''
1280 @echo 'Configuration targets:'
1281 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1282 @echo ''
1283 @echo 'Other generic targets:'
1284 @echo ' all - Build all targets marked with [*]'
1285 @echo '* vmlinux - Build the bare kernel'
1286 @echo '* modules - Build all modules'
1287 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1288 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1289 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1290 @echo ' dir/ - Build all files in dir and below'
1291 @echo ' dir/file.[ois] - Build specified target only'
1292 @echo ' dir/file.ko - Build module including final link'
1293 @echo ' prepare - Set up for building external modules'
1294 @echo ' tags/TAGS - Generate tags file for editors'
1295 @echo ' cscope - Generate cscope index'
1296 @echo ' kernelrelease - Output the release version string'
1297 @echo ' kernelversion - Output the version stored in Makefile'
1298 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1299 echo ' (default: $(INSTALL_HDR_PATH))'; \
1300 echo ''
1301 @echo 'Static analysers'
1302 @echo ' checkstack - Generate a list of stack hogs'
1303 @echo ' namespacecheck - Name space analysis on compiled kernel'
1304 @echo ' versioncheck - Sanity check on version.h usage'
1305 @echo ' includecheck - Check for duplicate included header files'
1306 @echo ' export_report - List the usages of all exported symbols'
1307 @echo ' headers_check - Sanity check on exported headers'
1308 @echo ' headerdep - Detect inclusion cycles in headers'; \
1309 echo ''
1310 @echo 'Kernel packaging:'
1311 @$(MAKE) $(build)=$(package-dir) help
1312 @echo ''
1313 @echo 'Documentation targets:'
1314 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1315 @echo ''
1316 @echo 'Architecture specific targets ($(SRCARCH)):'
1317 @$(if $(archhelp),$(archhelp),\
1318 echo ' No architecture specific help defined for $(SRCARCH)')
1319 @echo ''
1320 @$(if $(boards), \
1321 $(foreach b, $(boards), \
1322 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1323 echo '')
1324 @$(if $(board-dirs), \
1325 $(foreach b, $(board-dirs), \
1326 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1327 printf " %-16s - Show all of the above\\n" help-boards; \
1328 echo '')
1329
1330 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1331 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1332 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1333 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1334 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1335 @echo ''
1336 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1337 @echo 'For further info see the ./README file'
1338
1339
1340 help-board-dirs := $(addprefix help-,$(board-dirs))
1341
1342 help-boards: $(help-board-dirs)
1343
1344 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1345
1346 $(help-board-dirs): help-%:
1347 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1348 @$(if $(boards-per-dir), \
1349 $(foreach b, $(boards-per-dir), \
1350 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1351 echo '')
1352
1353
1354 # Documentation targets
1355 # ---------------------------------------------------------------------------
1356 %docs: scripts_basic FORCE
1357 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1358
1359 else # KBUILD_EXTMOD
1360
1361 ###
1362 # External module support.
1363 # When building external modules the kernel used as basis is considered
1364 # read-only, and no consistency checks are made and the make
1365 # system is not used on the basis kernel. If updates are required
1366 # in the basis kernel ordinary make commands (without M=...) must
1367 # be used.
1368 #
1369 # The following are the only valid targets when building external
1370 # modules.
1371 # make M=dir clean Delete all automatically generated files
1372 # make M=dir modules Make all modules in specified dir
1373 # make M=dir Same as 'make M=dir modules'
1374 # make M=dir modules_install
1375 # Install the modules built in the module directory
1376 # Assumes install directory is already created
1377
1378 # We are always building modules
1379 KBUILD_MODULES := 1
1380 PHONY += crmodverdir
1381 crmodverdir:
1382 $(cmd_crmodverdir)
1383
1384 PHONY += $(objtree)/Module.symvers
1385 $(objtree)/Module.symvers:
1386 @test -e $(objtree)/Module.symvers || ( \
1387 echo; \
1388 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1389 echo " is missing; modules will have no dependencies and modversions."; \
1390 echo )
1391
1392 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1393 PHONY += $(module-dirs) modules
1394 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1395 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1396
1397 modules: $(module-dirs)
1398 @$(kecho) ' Building modules, stage 2.';
1399 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1400
1401 PHONY += modules_install
1402 modules_install: _emodinst_ _emodinst_post
1403
1404 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1405 PHONY += _emodinst_
1406 _emodinst_:
1407 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1408 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1409
1410 PHONY += _emodinst_post
1411 _emodinst_post: _emodinst_
1412 $(call cmd,depmod)
1413
1414 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1415
1416 PHONY += $(clean-dirs) clean
1417 $(clean-dirs):
1418 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1419
1420 clean: rm-dirs := $(MODVERDIR)
1421 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1422 clean: $(clean-dirs)
1423 $(call cmd,rmdirs)
1424 $(call cmd,rmfiles)
1425 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1426 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1427 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1428 -type f -print | xargs rm -f
1429
1430 help:
1431 @echo ' Building external modules.'
1432 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1433 @echo ''
1434 @echo ' modules - default target, build the module(s)'
1435 @echo ' modules_install - install the module'
1436 @echo ' clean - remove generated files in module directory only'
1437 @echo ''
1438
1439 # Dummies...
1440 PHONY += prepare scripts
1441 prepare: ;
1442 scripts: ;
1443 endif # KBUILD_EXTMOD
1444
1445 # Generate tags for editors
1446 # ---------------------------------------------------------------------------
1447 quiet_cmd_tags = GEN $@
1448 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1449
1450 tags TAGS cscope: FORCE
1451 $(call cmd,tags)
1452
1453 # Scripts to check various things for consistency
1454 # ---------------------------------------------------------------------------
1455
1456 includecheck:
1457 find * $(RCS_FIND_IGNORE) \
1458 -name '*.[hcS]' -type f -print | sort \
1459 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1460
1461 versioncheck:
1462 find * $(RCS_FIND_IGNORE) \
1463 -name '*.[hcS]' -type f -print | sort \
1464 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1465
1466 namespacecheck:
1467 $(PERL) $(srctree)/scripts/namespace.pl
1468
1469 export_report:
1470 $(PERL) $(srctree)/scripts/export_report.pl
1471
1472 endif #ifeq ($(config-targets),1)
1473 endif #ifeq ($(mixed-targets),1)
1474
1475 PHONY += checkstack kernelrelease kernelversion
1476
1477 # UML needs a little special treatment here. It wants to use the host
1478 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1479 # else wants $(ARCH), including people doing cross-builds, which means
1480 # that $(SUBARCH) doesn't work here.
1481 ifeq ($(ARCH), um)
1482 CHECKSTACK_ARCH := $(SUBARCH)
1483 else
1484 CHECKSTACK_ARCH := $(ARCH)
1485 endif
1486 checkstack:
1487 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1488 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1489
1490 kernelrelease:
1491 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1492 $(error kernelrelease not valid - run 'make prepare' to update it))
1493 kernelversion:
1494 @echo $(KERNELVERSION)
1495
1496 # Single targets
1497 # ---------------------------------------------------------------------------
1498 # Single targets are compatible with:
1499 # - build with mixed source and output
1500 # - build with separate output dir 'make O=...'
1501 # - external modules
1502 #
1503 # target-dir => where to store outputfile
1504 # build-dir => directory in kernel source tree to use
1505
1506 ifeq ($(KBUILD_EXTMOD),)
1507 build-dir = $(patsubst %/,%,$(dir $@))
1508 target-dir = $(dir $@)
1509 else
1510 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1511 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1512 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1513 endif
1514
1515 %.s: %.c prepare scripts FORCE
1516 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.i: %.c prepare scripts FORCE
1518 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.o: %.c prepare scripts FORCE
1520 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.lst: %.c prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.s: %.S prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.o: %.S prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.symtypes: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529
1530 # Modules
1531 /: prepare scripts FORCE
1532 $(cmd_crmodverdir)
1533 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1534 $(build)=$(build-dir)
1535 %/: prepare scripts FORCE
1536 $(cmd_crmodverdir)
1537 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1538 $(build)=$(build-dir)
1539 %.ko: prepare scripts FORCE
1540 $(cmd_crmodverdir)
1541 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1542 $(build)=$(build-dir) $(@:.ko=.o)
1543 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1544
1545 # FIXME Should go into a make.lib or something
1546 # ===========================================================================
1547
1548 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1549 cmd_rmdirs = rm -rf $(rm-dirs)
1550
1551 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1552 cmd_rmfiles = rm -f $(rm-files)
1553
1554 # Run depmod only if we have System.map and depmod is executable
1555 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1556 cmd_depmod = \
1557 if [ -r System.map -a -x $(DEPMOD) ]; then \
1558 $(DEPMOD) -ae -F System.map \
1559 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1560 $(KERNELRELEASE); \
1561 fi
1562
1563 # Create temporary dir for module support files
1564 # clean it up only when building all modules
1565 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1566 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1567
1568 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1569 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1570 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1571
1572 quiet_cmd_as_o_S = AS $@
1573 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1574
1575 # read all saved command lines
1576
1577 targets := $(wildcard $(sort $(targets)))
1578 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1579
1580 ifneq ($(cmd_files),)
1581 $(cmd_files): ; # Do not try to update included dependency files
1582 include $(cmd_files)
1583 endif
1584
1585 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1586 # Usage:
1587 # $(Q)$(MAKE) $(clean)=dir
1588 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1589
1590 endif # skip-makefile
1591
1592 PHONY += FORCE
1593 FORCE:
1594
1595 # Declare the contents of the .PHONY variable as phony. We keep that
1596 # information in a variable se we can use it in if_changed and friends.
1597 .PHONY: $(PHONY)