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1 VERSION = 4
2 PATCHLEVEL = 1
3 SUBLEVEL = 41
4 EXTRAVERSION =
5 NAME = Series 4800
6
7 # *DOCUMENTATION*
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
12
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18 # Avoid funny character set dependencies
19 unexport LC_ALL
20 LC_COLLATE=C
21 LC_NUMERIC=C
22 export LC_COLLATE LC_NUMERIC
23
24 # Avoid interference with shell env settings
25 unexport GREP_OPTIONS
26
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
29 #
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
36 # is now up to date.
37 #
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
41 # prepare rule.
42
43 # Beautify output
44 # ---------------------------------------------------------------------------
45 #
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
49 #
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52 #
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
57 #
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
60 #
61 # $(Q)ln $@ :<
62 #
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
65 #
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
68
69 ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71 endif
72 ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74 endif
75
76 ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79 else
80 quiet=quiet_
81 Q = @
82 endif
83
84 # If the user is running make -s (silent mode), suppress echoing of
85 # commands
86
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90 endif
91 else # make-3.8x
92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94 endif
95 endif
96
97 export quiet Q KBUILD_VERBOSE
98
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
102 # 1) O=
103 # Use "make O=dir/to/store/output/files/"
104 #
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
109 # make
110 #
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
112 # variable.
113
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC),)
117
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122 endif
123
124 # That's our default target when none is given on the command line
125 PHONY := _all
126 _all:
127
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
130
131 ifneq ($(KBUILD_OUTPUT),)
132 # Invoke a second make in the output directory, passing relevant variables
133 # check that the output directory actually exists
134 saved-output := $(KBUILD_OUTPUT)
135 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 && /bin/pwd)
137 $(if $(KBUILD_OUTPUT),, \
138 $(error failed to create output directory "$(saved-output)"))
139
140 PHONY += $(MAKECMDGOALS) sub-make
141
142 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
143 @:
144
145 sub-make: FORCE
146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149 # Leave processing to above invocation of make
150 skip-makefile := 1
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
153
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile),)
156
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS += --no-print-directory
161
162 # Call a source code checker (by default, "sparse") as part of the
163 # C compilation.
164 #
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
168 #
169 # See the file "Documentation/sparse.txt" for more details, including
170 # where to get the "sparse" utility.
171
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174 endif
175 ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177 endif
178
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
182 ifdef SUBDIRS
183 KBUILD_EXTMOD ?= $(SUBDIRS)
184 endif
185
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
188 endif
189
190 # If building an external module we do not care about the all: rule
191 # but instead _all depend on modules
192 PHONY += all
193 ifeq ($(KBUILD_EXTMOD),)
194 _all: all
195 else
196 _all: modules
197 endif
198
199 ifeq ($(KBUILD_SRC),)
200 # building in the source tree
201 srctree := .
202 else
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
205 srctree := ..
206 else
207 srctree := $(KBUILD_SRC)
208 endif
209 endif
210 objtree := .
211 src := $(srctree)
212 obj := $(objtree)
213
214 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215
216 export srctree objtree VPATH
217
218
219 # SUBARCH tells the usermode build what the underlying arch is. That is set
220 # first, and if a usermode build is happening, the "ARCH=um" on the command
221 # line overrides the setting of ARCH below. If a native build is happening,
222 # then ARCH is assigned, getting whatever value it gets normally, and
223 # SUBARCH is subsequently ignored.
224
225 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
226 -e s/sun4u/sparc64/ \
227 -e s/arm.*/arm/ -e s/sa110/arm/ \
228 -e s/s390x/s390/ -e s/parisc64/parisc/ \
229 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
230 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
231
232 # Cross compiling and selecting different set of gcc/bin-utils
233 # ---------------------------------------------------------------------------
234 #
235 # When performing cross compilation for other architectures ARCH shall be set
236 # to the target architecture. (See arch/* for the possibilities).
237 # ARCH can be set during invocation of make:
238 # make ARCH=ia64
239 # Another way is to have ARCH set in the environment.
240 # The default ARCH is the host where make is executed.
241
242 # CROSS_COMPILE specify the prefix used for all executables used
243 # during compilation. Only gcc and related bin-utils executables
244 # are prefixed with $(CROSS_COMPILE).
245 # CROSS_COMPILE can be set on the command line
246 # make CROSS_COMPILE=ia64-linux-
247 # Alternatively CROSS_COMPILE can be set in the environment.
248 # A third alternative is to store a setting in .config so that plain
249 # "make" in the configured kernel build directory always uses that.
250 # Default value for CROSS_COMPILE is not to prefix executables
251 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
252 ARCH ?= $(SUBARCH)
253 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
254
255 # Architecture as present in compile.h
256 UTS_MACHINE := $(ARCH)
257 SRCARCH := $(ARCH)
258
259 # Additional ARCH settings for x86
260 ifeq ($(ARCH),i386)
261 SRCARCH := x86
262 endif
263 ifeq ($(ARCH),x86_64)
264 SRCARCH := x86
265 endif
266
267 # Additional ARCH settings for sparc
268 ifeq ($(ARCH),sparc32)
269 SRCARCH := sparc
270 endif
271 ifeq ($(ARCH),sparc64)
272 SRCARCH := sparc
273 endif
274
275 # Additional ARCH settings for sh
276 ifeq ($(ARCH),sh64)
277 SRCARCH := sh
278 endif
279
280 # Additional ARCH settings for tile
281 ifeq ($(ARCH),tilepro)
282 SRCARCH := tile
283 endif
284 ifeq ($(ARCH),tilegx)
285 SRCARCH := tile
286 endif
287
288 # Where to locate arch specific headers
289 hdr-arch := $(SRCARCH)
290
291 KCONFIG_CONFIG ?= .config
292 export KCONFIG_CONFIG
293
294 # SHELL used by kbuild
295 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
296 else if [ -x /bin/bash ]; then echo /bin/bash; \
297 else echo sh; fi ; fi)
298
299 HOSTCC = gcc
300 HOSTCXX = g++
301 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
302 HOSTCXXFLAGS = -O2
303
304 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
305 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
306 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
307 endif
308
309 # Decide whether to build built-in, modular, or both.
310 # Normally, just do built-in.
311
312 KBUILD_MODULES :=
313 KBUILD_BUILTIN := 1
314
315 # If we have only "make modules", don't compile built-in objects.
316 # When we're building modules with modversions, we need to consider
317 # the built-in objects during the descend as well, in order to
318 # make sure the checksums are up to date before we record them.
319
320 ifeq ($(MAKECMDGOALS),modules)
321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
322 endif
323
324 # If we have "make <whatever> modules", compile modules
325 # in addition to whatever we do anyway.
326 # Just "make" or "make all" shall build modules as well
327
328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
329 KBUILD_MODULES := 1
330 endif
331
332 ifeq ($(MAKECMDGOALS),)
333 KBUILD_MODULES := 1
334 endif
335
336 export KBUILD_MODULES KBUILD_BUILTIN
337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338
339 ifneq ($(CC),)
340 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
341 COMPILER := clang
342 else
343 COMPILER := gcc
344 endif
345 export COMPILER
346 endif
347
348 # We need some generic definitions (do not try to remake the file).
349 scripts/Kbuild.include: ;
350 include scripts/Kbuild.include
351
352 # Make variables (CC, etc...)
353 AS = $(CROSS_COMPILE)as
354 LD = $(CROSS_COMPILE)ld
355 CC = $(CROSS_COMPILE)gcc
356 CPP = $(CC) -E
357 AR = $(CROSS_COMPILE)ar
358 NM = $(CROSS_COMPILE)nm
359 STRIP = $(CROSS_COMPILE)strip
360 OBJCOPY = $(CROSS_COMPILE)objcopy
361 OBJDUMP = $(CROSS_COMPILE)objdump
362 AWK = awk
363 GENKSYMS = scripts/genksyms/genksyms
364 INSTALLKERNEL := installkernel
365 DEPMOD = /sbin/depmod
366 PERL = perl
367 PYTHON = python
368 CHECK = sparse
369
370 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
371 -Wbitwise -Wno-return-void $(CF)
372 CFLAGS_MODULE =
373 AFLAGS_MODULE =
374 LDFLAGS_MODULE =
375 CFLAGS_KERNEL =
376 AFLAGS_KERNEL =
377 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
378
379
380 # Use USERINCLUDE when you must reference the UAPI directories only.
381 USERINCLUDE := \
382 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
383 -Iarch/$(hdr-arch)/include/generated/uapi \
384 -I$(srctree)/include/uapi \
385 -Iinclude/generated/uapi \
386 -include $(srctree)/include/linux/kconfig.h
387
388 # Use LINUXINCLUDE when you must reference the include/ directory.
389 # Needed to be compatible with the O= option
390 LINUXINCLUDE := \
391 -I$(srctree)/arch/$(hdr-arch)/include \
392 -Iarch/$(hdr-arch)/include/generated/uapi \
393 -Iarch/$(hdr-arch)/include/generated \
394 $(if $(KBUILD_SRC), -I$(srctree)/include) \
395 -Iinclude \
396 $(USERINCLUDE)
397
398 KBUILD_CPPFLAGS := -D__KERNEL__
399
400 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
401 -fno-strict-aliasing -fno-common \
402 -Werror-implicit-function-declaration \
403 -Wno-format-security \
404 -std=gnu89
405
406 KBUILD_AFLAGS_KERNEL :=
407 KBUILD_CFLAGS_KERNEL :=
408 KBUILD_AFLAGS := -D__ASSEMBLY__
409 KBUILD_AFLAGS_MODULE := -DMODULE
410 KBUILD_CFLAGS_MODULE := -DMODULE
411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
412
413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
416
417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419 export CPP AR NM STRIP OBJCOPY OBJDUMP
420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
422
423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428 export KBUILD_ARFLAGS
429
430 # When compiling out-of-tree modules, put MODVERDIR in the module
431 # tree rather than in the kernel tree. The kernel tree might
432 # even be read-only.
433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
434
435 # Files to ignore in find ... statements
436
437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
439 -prune -o
440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441 --exclude CVS --exclude .pc --exclude .hg --exclude .git
442
443 # ===========================================================================
444 # Rules shared between *config targets and build targets
445
446 # Basic helpers built in scripts/
447 PHONY += scripts_basic
448 scripts_basic:
449 $(Q)$(MAKE) $(build)=scripts/basic
450 $(Q)rm -f .tmp_quiet_recordmcount
451
452 # To avoid any implicit rule to kick in, define an empty command.
453 scripts/basic/%: scripts_basic ;
454
455 PHONY += outputmakefile
456 # outputmakefile generates a Makefile in the output directory, if using a
457 # separate output directory. This allows convenient use of make in the
458 # output directory.
459 outputmakefile:
460 ifneq ($(KBUILD_SRC),)
461 $(Q)ln -fsn $(srctree) source
462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464 endif
465
466 # Support for using generic headers in asm-generic
467 PHONY += asm-generic
468 asm-generic:
469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470 src=asm obj=arch/$(SRCARCH)/include/generated/asm
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
473
474 # To make sure we do not include .config for any of the *config targets
475 # catch them early, and hand them over to scripts/kconfig/Makefile
476 # It is allowed to specify more targets when calling make, including
477 # mixing *config targets and build targets.
478 # For example 'make oldconfig all'.
479 # Detect when mixed targets is specified, and make a second invocation
480 # of make so .config is not included in this case either (for *config).
481
482 version_h := include/generated/uapi/linux/version.h
483 old_version_h := include/linux/version.h
484
485 no-dot-config-targets := clean mrproper distclean \
486 cscope gtags TAGS tags help% %docs check% coccicheck \
487 $(version_h) headers_% archheaders archscripts \
488 kernelversion %src-pkg
489
490 config-targets := 0
491 mixed-targets := 0
492 dot-config := 1
493
494 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 dot-config := 0
497 endif
498 endif
499
500 ifeq ($(KBUILD_EXTMOD),)
501 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502 config-targets := 1
503 ifneq ($(words $(MAKECMDGOALS)),1)
504 mixed-targets := 1
505 endif
506 endif
507 endif
508
509 ifeq ($(mixed-targets),1)
510 # ===========================================================================
511 # We're called with mixed targets (*config and build targets).
512 # Handle them one by one.
513
514 PHONY += $(MAKECMDGOALS) __build_one_by_one
515
516 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
517 @:
518
519 __build_one_by_one:
520 $(Q)set -e; \
521 for i in $(MAKECMDGOALS); do \
522 $(MAKE) -f $(srctree)/Makefile $$i; \
523 done
524
525 else
526 ifeq ($(config-targets),1)
527 # ===========================================================================
528 # *config targets only - make sure prerequisites are updated, and descend
529 # in scripts/kconfig to make the *config target
530
531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
532 # KBUILD_DEFCONFIG may point out an alternative default configuration
533 # used for 'make defconfig'
534 include arch/$(SRCARCH)/Makefile
535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
536
537 config: scripts_basic outputmakefile FORCE
538 $(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540 %config: scripts_basic outputmakefile FORCE
541 $(Q)$(MAKE) $(build)=scripts/kconfig $@
542
543 else
544 # ===========================================================================
545 # Build targets only - this includes vmlinux, arch specific targets, clean
546 # targets and others. In general all targets except *config targets.
547
548 ifeq ($(KBUILD_EXTMOD),)
549 # Additional helpers built in scripts/
550 # Carefully list dependencies so we do not try to build scripts twice
551 # in parallel
552 PHONY += scripts
553 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
554 asm-generic
555 $(Q)$(MAKE) $(build)=$(@)
556
557 # Objects we will link into vmlinux / subdirs we need to visit
558 init-y := init/
559 drivers-y := drivers/ sound/ firmware/
560 net-y := net/
561 libs-y := lib/
562 core-y := usr/
563 endif # KBUILD_EXTMOD
564
565 ifeq ($(dot-config),1)
566 # Read in config
567 -include include/config/auto.conf
568
569 ifeq ($(KBUILD_EXTMOD),)
570 # Read in dependencies to all Kconfig* files, make sure to run
571 # oldconfig if changes are detected.
572 -include include/config/auto.conf.cmd
573
574 # To avoid any implicit rule to kick in, define an empty command
575 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
576
577 # If .config is newer than include/config/auto.conf, someone tinkered
578 # with it and forgot to run make oldconfig.
579 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
580 # we execute the config step to be sure to catch updated Kconfig files
581 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
582 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
583 else
584 # external modules needs include/generated/autoconf.h and include/config/auto.conf
585 # but do not care if they are up-to-date. Use auto.conf to trigger the test
586 PHONY += include/config/auto.conf
587
588 include/config/auto.conf:
589 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
590 echo >&2; \
591 echo >&2 " ERROR: Kernel configuration is invalid."; \
592 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
593 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
594 echo >&2 ; \
595 /bin/false)
596
597 endif # KBUILD_EXTMOD
598
599 else
600 # Dummy target needed, because used as prerequisite
601 include/config/auto.conf: ;
602 endif # $(dot-config)
603
604 # The all: target is the default when no target is given on the
605 # command line.
606 # This allow a user to issue only 'make' to build a kernel including modules
607 # Defaults to vmlinux, but the arch makefile usually adds further targets
608 all: vmlinux
609
610 include arch/$(SRCARCH)/Makefile
611
612 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
613 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
614 KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
615
616 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
618 else
619 KBUILD_CFLAGS += -O2
620 endif
621
622 # Tell gcc to never replace conditional load with a non-conditional one
623 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
624
625 ifdef CONFIG_READABLE_ASM
626 # Disable optimizations that make assembler listings hard to read.
627 # reorder blocks reorders the control in the function
628 # ipa clone creates specialized cloned functions
629 # partial inlining inlines only parts of functions
630 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
631 $(call cc-option,-fno-ipa-cp-clone,) \
632 $(call cc-option,-fno-partial-inlining)
633 endif
634
635 ifneq ($(CONFIG_FRAME_WARN),0)
636 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
637 endif
638
639 # Handle stack protector mode.
640 #
641 # Since kbuild can potentially perform two passes (first with the old
642 # .config values and then with updated .config values), we cannot error out
643 # if a desired compiler option is unsupported. If we were to error, kbuild
644 # could never get to the second pass and actually notice that we changed
645 # the option to something that was supported.
646 #
647 # Additionally, we don't want to fallback and/or silently change which compiler
648 # flags will be used, since that leads to producing kernels with different
649 # security feature characteristics depending on the compiler used. ("But I
650 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
651 #
652 # The middle ground is to warn here so that the failed option is obvious, but
653 # to let the build fail with bad compiler flags so that we can't produce a
654 # kernel when there is a CONFIG and compiler mismatch.
655 #
656 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
657 stackp-flag := -fstack-protector
658 ifeq ($(call cc-option, $(stackp-flag)),)
659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
660 -fstack-protector not supported by compiler)
661 endif
662 else
663 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
664 stackp-flag := -fstack-protector-strong
665 ifeq ($(call cc-option, $(stackp-flag)),)
666 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
667 -fstack-protector-strong not supported by compiler)
668 endif
669 else
670 # Force off for distro compilers that enable stack protector by default.
671 stackp-flag := $(call cc-option, -fno-stack-protector)
672 endif
673 endif
674 KBUILD_CFLAGS += $(stackp-flag)
675
676 ifeq ($(COMPILER),clang)
677 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682 # Quiet clang warning: comparison of unsigned expression < 0 is always false
683 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
686 # See modpost pattern 2
687 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
688 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
689 else
690
691 # These warnings generated too much noise in a regular build.
692 # Use make W=1 to enable them (see scripts/Makefile.build)
693 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
694 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
695 endif
696
697 ifdef CONFIG_FRAME_POINTER
698 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
699 else
700 # Some targets (ARM with Thumb2, for example), can't be built with frame
701 # pointers. For those, we don't have FUNCTION_TRACER automatically
702 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
703 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
704 # -fomit-frame-pointer with FUNCTION_TRACER.
705 ifndef CONFIG_FUNCTION_TRACER
706 KBUILD_CFLAGS += -fomit-frame-pointer
707 endif
708 endif
709
710 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
711
712 ifdef CONFIG_DEBUG_INFO
713 ifdef CONFIG_DEBUG_INFO_SPLIT
714 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
715 else
716 KBUILD_CFLAGS += -g
717 endif
718 KBUILD_AFLAGS += -Wa,-gdwarf-2
719 endif
720 ifdef CONFIG_DEBUG_INFO_DWARF4
721 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
722 endif
723
724 ifdef CONFIG_DEBUG_INFO_REDUCED
725 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
726 $(call cc-option,-fno-var-tracking)
727 endif
728
729 ifdef CONFIG_FUNCTION_TRACER
730 ifndef CC_FLAGS_FTRACE
731 CC_FLAGS_FTRACE := -pg
732 endif
733 export CC_FLAGS_FTRACE
734 ifdef CONFIG_HAVE_FENTRY
735 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
736 endif
737 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
738 KBUILD_AFLAGS += $(CC_USING_FENTRY)
739 ifdef CONFIG_DYNAMIC_FTRACE
740 ifdef CONFIG_HAVE_C_RECORDMCOUNT
741 BUILD_C_RECORDMCOUNT := y
742 export BUILD_C_RECORDMCOUNT
743 endif
744 endif
745 endif
746
747 # We trigger additional mismatches with less inlining
748 ifdef CONFIG_DEBUG_SECTION_MISMATCH
749 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
750 endif
751
752 # arch Makefile may override CC so keep this after arch Makefile is included
753 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
754 CHECKFLAGS += $(NOSTDINC_FLAGS)
755
756 # warn about C99 declaration after statement
757 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
758
759 # disable pointer signed / unsigned warnings in gcc 4.0
760 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
761
762 # disable invalid "can't wrap" optimizations for signed / pointers
763 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
764
765 # conserve stack if available
766 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
767
768 # disallow errors like 'EXPORT_GPL(foo);' with missing header
769 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
770
771 # require functions to have arguments in prototypes, not empty 'int foo()'
772 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
773
774 # Prohibit date/time macros, which would make the build non-deterministic
775 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
776
777 # use the deterministic mode of AR if available
778 KBUILD_ARFLAGS := $(call ar-option,D)
779
780 # check for 'asm goto'
781 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
782 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
783 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
784 endif
785
786 include scripts/Makefile.kasan
787 include scripts/Makefile.extrawarn
788
789 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
790 # last assignments
791 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
792 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
793 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
794
795 # Use --build-id when available.
796 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
797 $(call cc-ldoption, -Wl$(comma)--build-id,))
798 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
799 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
800
801 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
802 LDFLAGS_vmlinux += $(call ld-option, -X,)
803 endif
804
805 # Default kernel image to build when no specific target is given.
806 # KBUILD_IMAGE may be overruled on the command line or
807 # set in the environment
808 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
809 # this default value
810 export KBUILD_IMAGE ?= vmlinux
811
812 #
813 # INSTALL_PATH specifies where to place the updated kernel and system map
814 # images. Default is /boot, but you can set it to other values
815 export INSTALL_PATH ?= /boot
816
817 #
818 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
819 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
820 # an argument if needed. Otherwise it defaults to the kernel install path
821 #
822 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
823
824 #
825 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
826 # relocations required by build roots. This is not defined in the
827 # makefile but the argument can be passed to make if needed.
828 #
829
830 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
831 export MODLIB
832
833 #
834 # INSTALL_MOD_STRIP, if defined, will cause modules to be
835 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
836 # the default option --strip-debug will be used. Otherwise,
837 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
838
839 ifdef INSTALL_MOD_STRIP
840 ifeq ($(INSTALL_MOD_STRIP),1)
841 mod_strip_cmd = $(STRIP) --strip-debug
842 else
843 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
844 endif # INSTALL_MOD_STRIP=1
845 else
846 mod_strip_cmd = true
847 endif # INSTALL_MOD_STRIP
848 export mod_strip_cmd
849
850 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
851 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
852 # or CONFIG_MODULE_COMPRESS_XZ.
853
854 mod_compress_cmd = true
855 ifdef CONFIG_MODULE_COMPRESS
856 ifdef CONFIG_MODULE_COMPRESS_GZIP
857 mod_compress_cmd = gzip -n
858 endif # CONFIG_MODULE_COMPRESS_GZIP
859 ifdef CONFIG_MODULE_COMPRESS_XZ
860 mod_compress_cmd = xz
861 endif # CONFIG_MODULE_COMPRESS_XZ
862 endif # CONFIG_MODULE_COMPRESS
863 export mod_compress_cmd
864
865 # Select initial ramdisk compression format, default is gzip(1).
866 # This shall be used by the dracut(8) tool while creating an initramfs image.
867 #
868 INITRD_COMPRESS-y := gzip
869 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
870 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
871 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
872 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
873 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
874 # do not export INITRD_COMPRESS, since we didn't actually
875 # choose a sane default compression above.
876 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
877
878 ifdef CONFIG_MODULE_SIG_ALL
879 MODSECKEY = ./signing_key.priv
880 MODPUBKEY = ./signing_key.x509
881 export MODPUBKEY
882 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
883 else
884 mod_sign_cmd = true
885 endif
886 export mod_sign_cmd
887
888
889 ifeq ($(KBUILD_EXTMOD),)
890 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
891
892 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
893 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
894 $(net-y) $(net-m) $(libs-y) $(libs-m)))
895
896 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
897 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
898
899 init-y := $(patsubst %/, %/built-in.o, $(init-y))
900 core-y := $(patsubst %/, %/built-in.o, $(core-y))
901 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
902 net-y := $(patsubst %/, %/built-in.o, $(net-y))
903 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
904 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
905 libs-y := $(libs-y1) $(libs-y2)
906
907 # Externally visible symbols (used by link-vmlinux.sh)
908 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
909 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
910 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
911 export LDFLAGS_vmlinux
912 # used by scripts/pacmage/Makefile
913 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
914
915 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
916
917 # Final link of vmlinux
918 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
919 quiet_cmd_link-vmlinux = LINK $@
920
921 # Include targets which we want to
922 # execute if the rest of the kernel build went well.
923 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
924 ifdef CONFIG_HEADERS_CHECK
925 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
926 endif
927 ifdef CONFIG_SAMPLES
928 $(Q)$(MAKE) $(build)=samples
929 endif
930 ifdef CONFIG_BUILD_DOCSRC
931 $(Q)$(MAKE) $(build)=Documentation
932 endif
933 ifdef CONFIG_GDB_SCRIPTS
934 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
935 endif
936 +$(call if_changed,link-vmlinux)
937
938 # The actual objects are generated when descending,
939 # make sure no implicit rule kicks in
940 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
941
942 # Handle descending into subdirectories listed in $(vmlinux-dirs)
943 # Preset locale variables to speed up the build process. Limit locale
944 # tweaks to this spot to avoid wrong language settings when running
945 # make menuconfig etc.
946 # Error messages still appears in the original language
947
948 PHONY += $(vmlinux-dirs)
949 $(vmlinux-dirs): prepare scripts
950 $(Q)$(MAKE) $(build)=$@
951
952 define filechk_kernel.release
953 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
954 endef
955
956 # Store (new) KERNELRELEASE string in include/config/kernel.release
957 include/config/kernel.release: include/config/auto.conf FORCE
958 $(call filechk,kernel.release)
959
960
961 # Things we need to do before we recursively start building the kernel
962 # or the modules are listed in "prepare".
963 # A multi level approach is used. prepareN is processed before prepareN-1.
964 # archprepare is used in arch Makefiles and when processed asm symlink,
965 # version.h and scripts_basic is processed / created.
966
967 # Listed in dependency order
968 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
969
970 # prepare3 is used to check if we are building in a separate output directory,
971 # and if so do:
972 # 1) Check that make has not been executed in the kernel src $(srctree)
973 prepare3: include/config/kernel.release
974 ifneq ($(KBUILD_SRC),)
975 @$(kecho) ' Using $(srctree) as source for kernel'
976 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
977 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
978 echo >&2 " in the '$(srctree)' directory.";\
979 /bin/false; \
980 fi;
981 endif
982
983 # prepare2 creates a makefile if using a separate output directory
984 prepare2: prepare3 outputmakefile asm-generic
985
986 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
987 include/config/auto.conf
988 $(cmd_crmodverdir)
989
990 archprepare: archheaders archscripts prepare1 scripts_basic
991
992 prepare0: archprepare FORCE
993 $(Q)$(MAKE) $(build)=.
994
995 # All the preparing..
996 prepare: prepare0
997
998 # Generate some files
999 # ---------------------------------------------------------------------------
1000
1001 # KERNELRELEASE can change from a few different places, meaning version.h
1002 # needs to be updated, so this check is forced on all builds
1003
1004 uts_len := 64
1005 define filechk_utsrelease.h
1006 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1007 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1008 exit 1; \
1009 fi; \
1010 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1011 endef
1012
1013 define filechk_version.h
1014 (echo \#define LINUX_VERSION_CODE $(shell \
1015 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1016 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1017 endef
1018
1019 $(version_h): $(srctree)/Makefile FORCE
1020 $(call filechk,version.h)
1021 $(Q)rm -f $(old_version_h)
1022
1023 include/generated/utsrelease.h: include/config/kernel.release FORCE
1024 $(call filechk,utsrelease.h)
1025
1026 PHONY += headerdep
1027 headerdep:
1028 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1029 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1030
1031 # ---------------------------------------------------------------------------
1032 # Firmware install
1033 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1034 export INSTALL_FW_PATH
1035
1036 PHONY += firmware_install
1037 firmware_install: FORCE
1038 @mkdir -p $(objtree)/firmware
1039 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1040
1041 # ---------------------------------------------------------------------------
1042 # Kernel headers
1043
1044 #Default location for installed headers
1045 export INSTALL_HDR_PATH = $(objtree)/usr
1046
1047 # If we do an all arch process set dst to asm-$(hdr-arch)
1048 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050 PHONY += archheaders
1051 archheaders:
1052
1053 PHONY += archscripts
1054 archscripts:
1055
1056 PHONY += __headers
1057 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1058 $(Q)$(MAKE) $(build)=scripts build_unifdef
1059
1060 PHONY += headers_install_all
1061 headers_install_all:
1062 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1063
1064 PHONY += headers_install
1065 headers_install: __headers
1066 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1067 $(error Headers not exportable for the $(SRCARCH) architecture))
1068 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1069 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1070
1071 PHONY += headers_check_all
1072 headers_check_all: headers_install_all
1073 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1074
1075 PHONY += headers_check
1076 headers_check: headers_install
1077 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1078 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1079
1080 # ---------------------------------------------------------------------------
1081 # Kernel selftest
1082
1083 PHONY += kselftest
1084 kselftest:
1085 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1086
1087 # ---------------------------------------------------------------------------
1088 # Modules
1089
1090 ifdef CONFIG_MODULES
1091
1092 # By default, build modules as well
1093
1094 all: modules
1095
1096 # Build modules
1097 #
1098 # A module can be listed more than once in obj-m resulting in
1099 # duplicate lines in modules.order files. Those are removed
1100 # using awk while concatenating to the final file.
1101
1102 PHONY += modules
1103 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1104 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1105 @$(kecho) ' Building modules, stage 2.';
1106 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1107 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1108
1109 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1110 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1111
1112 %/modules.builtin: include/config/auto.conf
1113 $(Q)$(MAKE) $(modbuiltin)=$*
1114
1115
1116 # Target to prepare building external modules
1117 PHONY += modules_prepare
1118 modules_prepare: prepare scripts
1119
1120 # Target to install modules
1121 PHONY += modules_install
1122 modules_install: _modinst_ _modinst_post
1123
1124 PHONY += _modinst_
1125 _modinst_:
1126 @rm -rf $(MODLIB)/kernel
1127 @rm -f $(MODLIB)/source
1128 @mkdir -p $(MODLIB)/kernel
1129 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1130 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1131 rm -f $(MODLIB)/build ; \
1132 ln -s $(CURDIR) $(MODLIB)/build ; \
1133 fi
1134 @cp -f $(objtree)/modules.order $(MODLIB)/
1135 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1137
1138 # This depmod is only for convenience to give the initial
1139 # boot a modules.dep even before / is mounted read-write. However the
1140 # boot script depmod is the master version.
1141 PHONY += _modinst_post
1142 _modinst_post: _modinst_
1143 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1144 $(call cmd,depmod)
1145
1146 ifeq ($(CONFIG_MODULE_SIG), y)
1147 PHONY += modules_sign
1148 modules_sign:
1149 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1150 endif
1151
1152 else # CONFIG_MODULES
1153
1154 # Modules not configured
1155 # ---------------------------------------------------------------------------
1156
1157 modules modules_install: FORCE
1158 @echo >&2
1159 @echo >&2 "The present kernel configuration has modules disabled."
1160 @echo >&2 "Type 'make config' and enable loadable module support."
1161 @echo >&2 "Then build a kernel with module support enabled."
1162 @echo >&2
1163 @exit 1
1164
1165 endif # CONFIG_MODULES
1166
1167 ###
1168 # Cleaning is done on three levels.
1169 # make clean Delete most generated files
1170 # Leave enough to build external modules
1171 # make mrproper Delete the current configuration, and all generated files
1172 # make distclean Remove editor backup files, patch leftover files and the like
1173
1174 # Directories & files removed with 'make clean'
1175 CLEAN_DIRS += $(MODVERDIR)
1176
1177 # Directories & files removed with 'make mrproper'
1178 MRPROPER_DIRS += include/config usr/include include/generated \
1179 arch/*/include/generated .tmp_objdiff
1180 MRPROPER_FILES += .config .config.old .version .old_version \
1181 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1182 signing_key.priv signing_key.x509 x509.genkey \
1183 extra_certificates signing_key.x509.keyid \
1184 signing_key.x509.signer vmlinux-gdb.py
1185
1186 # clean - Delete most, but leave enough to build external modules
1187 #
1188 clean: rm-dirs := $(CLEAN_DIRS)
1189 clean: rm-files := $(CLEAN_FILES)
1190 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1191
1192 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1193 $(clean-dirs):
1194 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1195
1196 vmlinuxclean:
1197 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1198
1199 clean: archclean vmlinuxclean
1200
1201 # mrproper - Delete all generated files, including .config
1202 #
1203 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1204 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1205 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1206
1207 PHONY += $(mrproper-dirs) mrproper archmrproper
1208 $(mrproper-dirs):
1209 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1210
1211 mrproper: clean archmrproper $(mrproper-dirs)
1212 $(call cmd,rmdirs)
1213 $(call cmd,rmfiles)
1214
1215 # distclean
1216 #
1217 PHONY += distclean
1218
1219 distclean: mrproper
1220 @find $(srctree) $(RCS_FIND_IGNORE) \
1221 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1222 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1223 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1224 -type f -print | xargs rm -f
1225
1226
1227 # Packaging of the kernel to various formats
1228 # ---------------------------------------------------------------------------
1229 # rpm target kept for backward compatibility
1230 package-dir := scripts/package
1231
1232 %src-pkg: FORCE
1233 $(Q)$(MAKE) $(build)=$(package-dir) $@
1234 %pkg: include/config/kernel.release FORCE
1235 $(Q)$(MAKE) $(build)=$(package-dir) $@
1236 rpm: include/config/kernel.release FORCE
1237 $(Q)$(MAKE) $(build)=$(package-dir) $@
1238
1239
1240 # Brief documentation of the typical targets used
1241 # ---------------------------------------------------------------------------
1242
1243 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1244 boards := $(sort $(notdir $(boards)))
1245 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1246 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1247
1248 help:
1249 @echo 'Cleaning targets:'
1250 @echo ' clean - Remove most generated files but keep the config and'
1251 @echo ' enough build support to build external modules'
1252 @echo ' mrproper - Remove all generated files + config + various backup files'
1253 @echo ' distclean - mrproper + remove editor backup and patch files'
1254 @echo ''
1255 @echo 'Configuration targets:'
1256 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1257 @echo ''
1258 @echo 'Other generic targets:'
1259 @echo ' all - Build all targets marked with [*]'
1260 @echo '* vmlinux - Build the bare kernel'
1261 @echo '* modules - Build all modules'
1262 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1263 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1264 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1265 @echo ' dir/ - Build all files in dir and below'
1266 @echo ' dir/file.[oisS] - Build specified target only'
1267 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1268 @echo ' (requires a recent binutils and recent build (System.map))'
1269 @echo ' dir/file.ko - Build module including final link'
1270 @echo ' modules_prepare - Set up for building external modules'
1271 @echo ' tags/TAGS - Generate tags file for editors'
1272 @echo ' cscope - Generate cscope index'
1273 @echo ' gtags - Generate GNU GLOBAL index'
1274 @echo ' kernelrelease - Output the release version string (use with make -s)'
1275 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1276 @echo ' image_name - Output the image name (use with make -s)'
1277 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1278 echo ' (default: $(INSTALL_HDR_PATH))'; \
1279 echo ''
1280 @echo 'Static analysers'
1281 @echo ' checkstack - Generate a list of stack hogs'
1282 @echo ' namespacecheck - Name space analysis on compiled kernel'
1283 @echo ' versioncheck - Sanity check on version.h usage'
1284 @echo ' includecheck - Check for duplicate included header files'
1285 @echo ' export_report - List the usages of all exported symbols'
1286 @echo ' headers_check - Sanity check on exported headers'
1287 @echo ' headerdep - Detect inclusion cycles in headers'
1288 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1289 @echo ''
1290 @echo 'Kernel selftest'
1291 @echo ' kselftest - Build and run kernel selftest (run as root)'
1292 @echo ' Build, install, and boot kernel before'
1293 @echo ' running kselftest on it'
1294 @echo ''
1295 @echo 'Kernel packaging:'
1296 @$(MAKE) $(build)=$(package-dir) help
1297 @echo ''
1298 @echo 'Documentation targets:'
1299 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1300 @echo ''
1301 @echo 'Architecture specific targets ($(SRCARCH)):'
1302 @$(if $(archhelp),$(archhelp),\
1303 echo ' No architecture specific help defined for $(SRCARCH)')
1304 @echo ''
1305 @$(if $(boards), \
1306 $(foreach b, $(boards), \
1307 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1308 echo '')
1309 @$(if $(board-dirs), \
1310 $(foreach b, $(board-dirs), \
1311 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1312 printf " %-16s - Show all of the above\\n" help-boards; \
1313 echo '')
1314
1315 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1316 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1317 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1318 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1319 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1320 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1321 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1322 @echo ' 1: warnings which may be relevant and do not occur too often'
1323 @echo ' 2: warnings which occur quite often but may still be relevant'
1324 @echo ' 3: more obscure warnings, can most likely be ignored'
1325 @echo ' Multiple levels can be combined with W=12 or W=123'
1326 @echo ''
1327 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1328 @echo 'For further info see the ./README file'
1329
1330
1331 help-board-dirs := $(addprefix help-,$(board-dirs))
1332
1333 help-boards: $(help-board-dirs)
1334
1335 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1336
1337 $(help-board-dirs): help-%:
1338 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1339 @$(if $(boards-per-dir), \
1340 $(foreach b, $(boards-per-dir), \
1341 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1342 echo '')
1343
1344
1345 # Documentation targets
1346 # ---------------------------------------------------------------------------
1347 %docs: scripts_basic FORCE
1348 $(Q)$(MAKE) $(build)=scripts build_docproc
1349 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1350
1351 else # KBUILD_EXTMOD
1352
1353 ###
1354 # External module support.
1355 # When building external modules the kernel used as basis is considered
1356 # read-only, and no consistency checks are made and the make
1357 # system is not used on the basis kernel. If updates are required
1358 # in the basis kernel ordinary make commands (without M=...) must
1359 # be used.
1360 #
1361 # The following are the only valid targets when building external
1362 # modules.
1363 # make M=dir clean Delete all automatically generated files
1364 # make M=dir modules Make all modules in specified dir
1365 # make M=dir Same as 'make M=dir modules'
1366 # make M=dir modules_install
1367 # Install the modules built in the module directory
1368 # Assumes install directory is already created
1369
1370 # We are always building modules
1371 KBUILD_MODULES := 1
1372 PHONY += crmodverdir
1373 crmodverdir:
1374 $(cmd_crmodverdir)
1375
1376 PHONY += $(objtree)/Module.symvers
1377 $(objtree)/Module.symvers:
1378 @test -e $(objtree)/Module.symvers || ( \
1379 echo; \
1380 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1381 echo " is missing; modules will have no dependencies and modversions."; \
1382 echo )
1383
1384 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1385 PHONY += $(module-dirs) modules
1386 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1387 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1388
1389 modules: $(module-dirs)
1390 @$(kecho) ' Building modules, stage 2.';
1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1392
1393 PHONY += modules_install
1394 modules_install: _emodinst_ _emodinst_post
1395
1396 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1397 PHONY += _emodinst_
1398 _emodinst_:
1399 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1400 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1401
1402 PHONY += _emodinst_post
1403 _emodinst_post: _emodinst_
1404 $(call cmd,depmod)
1405
1406 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1407
1408 PHONY += $(clean-dirs) clean
1409 $(clean-dirs):
1410 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1411
1412 clean: rm-dirs := $(MODVERDIR)
1413 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1414
1415 help:
1416 @echo ' Building external modules.'
1417 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1418 @echo ''
1419 @echo ' modules - default target, build the module(s)'
1420 @echo ' modules_install - install the module'
1421 @echo ' clean - remove generated files in module directory only'
1422 @echo ''
1423
1424 # Dummies...
1425 PHONY += prepare scripts
1426 prepare: ;
1427 scripts: ;
1428 endif # KBUILD_EXTMOD
1429
1430 clean: $(clean-dirs)
1431 $(call cmd,rmdirs)
1432 $(call cmd,rmfiles)
1433 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1434 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1435 -o -name '*.ko.*' \
1436 -o -name '*.dwo' \
1437 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1438 -o -name '*.symtypes' -o -name 'modules.order' \
1439 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1440 -o -name '*.gcno' \) -type f -print | xargs rm -f
1441
1442 # Generate tags for editors
1443 # ---------------------------------------------------------------------------
1444 quiet_cmd_tags = GEN $@
1445 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1446
1447 tags TAGS cscope gtags: FORCE
1448 $(call cmd,tags)
1449
1450 # Scripts to check various things for consistency
1451 # ---------------------------------------------------------------------------
1452
1453 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1454
1455 includecheck:
1456 find $(srctree)/* $(RCS_FIND_IGNORE) \
1457 -name '*.[hcS]' -type f -print | sort \
1458 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1459
1460 versioncheck:
1461 find $(srctree)/* $(RCS_FIND_IGNORE) \
1462 -name '*.[hcS]' -type f -print | sort \
1463 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1464
1465 coccicheck:
1466 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1467
1468 namespacecheck:
1469 $(PERL) $(srctree)/scripts/namespace.pl
1470
1471 export_report:
1472 $(PERL) $(srctree)/scripts/export_report.pl
1473
1474 endif #ifeq ($(config-targets),1)
1475 endif #ifeq ($(mixed-targets),1)
1476
1477 PHONY += checkstack kernelrelease kernelversion image_name
1478
1479 # UML needs a little special treatment here. It wants to use the host
1480 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1481 # else wants $(ARCH), including people doing cross-builds, which means
1482 # that $(SUBARCH) doesn't work here.
1483 ifeq ($(ARCH), um)
1484 CHECKSTACK_ARCH := $(SUBARCH)
1485 else
1486 CHECKSTACK_ARCH := $(ARCH)
1487 endif
1488 checkstack:
1489 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1490 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1491
1492 kernelrelease:
1493 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1494
1495 kernelversion:
1496 @echo $(KERNELVERSION)
1497
1498 image_name:
1499 @echo $(KBUILD_IMAGE)
1500
1501 # Clear a bunch of variables before executing the submake
1502 tools/: FORCE
1503 $(Q)mkdir -p $(objtree)/tools
1504 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1505
1506 tools/%: FORCE
1507 $(Q)mkdir -p $(objtree)/tools
1508 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1509
1510 # Single targets
1511 # ---------------------------------------------------------------------------
1512 # Single targets are compatible with:
1513 # - build with mixed source and output
1514 # - build with separate output dir 'make O=...'
1515 # - external modules
1516 #
1517 # target-dir => where to store outputfile
1518 # build-dir => directory in kernel source tree to use
1519
1520 ifeq ($(KBUILD_EXTMOD),)
1521 build-dir = $(patsubst %/,%,$(dir $@))
1522 target-dir = $(dir $@)
1523 else
1524 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1525 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1526 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1527 endif
1528
1529 %.s: %.c prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.i: %.c prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.o: %.c prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535 %.lst: %.c prepare scripts FORCE
1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 %.s: %.S prepare scripts FORCE
1538 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539 %.o: %.S prepare scripts FORCE
1540 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1541 %.symtypes: %.c prepare scripts FORCE
1542 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1543
1544 # Modules
1545 /: prepare scripts FORCE
1546 $(cmd_crmodverdir)
1547 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548 $(build)=$(build-dir)
1549 # Make sure the latest headers are built for Documentation
1550 Documentation/: headers_install
1551 %/: prepare scripts FORCE
1552 $(cmd_crmodverdir)
1553 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1554 $(build)=$(build-dir)
1555 %.ko: prepare scripts FORCE
1556 $(cmd_crmodverdir)
1557 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1558 $(build)=$(build-dir) $(@:.ko=.o)
1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1560
1561 # FIXME Should go into a make.lib or something
1562 # ===========================================================================
1563
1564 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1565 cmd_rmdirs = rm -rf $(rm-dirs)
1566
1567 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1568 cmd_rmfiles = rm -f $(rm-files)
1569
1570 # Run depmod only if we have System.map and depmod is executable
1571 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1572 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1573 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1574
1575 # Create temporary dir for module support files
1576 # clean it up only when building all modules
1577 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1578 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1579
1580 # read all saved command lines
1581
1582 targets := $(wildcard $(sort $(targets)))
1583 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1584
1585 ifneq ($(cmd_files),)
1586 $(cmd_files): ; # Do not try to update included dependency files
1587 include $(cmd_files)
1588 endif
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 so we can use it in if_changed and friends.
1597 .PHONY: $(PHONY)