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1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 5
3 PATCHLEVEL = 2
4 SUBLEVEL = 0
5 EXTRAVERSION = -rc1
6 NAME = Shy Crocodile
7
8 # *DOCUMENTATION*
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
13
14 # That's our default target when none is given on the command line
15 PHONY := _all
16 _all:
17
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
20 #
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
27 # is now up to date.
28 #
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
32 # prepare rule.
33
34 ifneq ($(sub_make_done),1)
35
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
38 MAKEFLAGS += -rR
39
40 # Avoid funny character set dependencies
41 unexport LC_ALL
42 LC_COLLATE=C
43 LC_NUMERIC=C
44 export LC_COLLATE LC_NUMERIC
45
46 # Avoid interference with shell env settings
47 unexport GREP_OPTIONS
48
49 # Beautify output
50 # ---------------------------------------------------------------------------
51 #
52 # Normally, we echo the whole command before executing it. By making
53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
54 # $(quiet) to choose other forms of output instead, e.g.
55 #
56 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58 #
59 # If $(quiet) is empty, the whole command will be printed.
60 # If it is set to "quiet_", only the short version will be printed.
61 # If it is set to "silent_", nothing will be printed at all, since
62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 #
64 # A simple variant is to prefix commands with $(Q) - that's useful
65 # for commands that shall be hidden in non-verbose mode.
66 #
67 # $(Q)ln $@ :<
68 #
69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 #
72 # To put more focus on warnings, be less verbose as default
73 # Use 'make V=1' to see the full commands
74
75 ifeq ("$(origin V)", "command line")
76 KBUILD_VERBOSE = $(V)
77 endif
78 ifndef KBUILD_VERBOSE
79 KBUILD_VERBOSE = 0
80 endif
81
82 ifeq ($(KBUILD_VERBOSE),1)
83 quiet =
84 Q =
85 else
86 quiet=quiet_
87 Q = @
88 endif
89
90 # If the user is running make -s (silent mode), suppress echoing of
91 # commands
92
93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
94 quiet=silent_
95 endif
96
97 export quiet Q KBUILD_VERBOSE
98
99 # Kbuild will save output files in the current working directory.
100 # This does not need to match to the root of the kernel source tree.
101 #
102 # For example, you can do this:
103 #
104 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
105 #
106 # If you want to save output files in a different location, there are
107 # two syntaxes to specify it.
108 #
109 # 1) O=
110 # Use "make O=dir/to/store/output/files/"
111 #
112 # 2) Set KBUILD_OUTPUT
113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
115 #
116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
117 # variable.
118
119 # Do we want to change the working directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122 endif
123
124 ifneq ($(KBUILD_OUTPUT),)
125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126 # expand a shell special character '~'. We use a somewhat tedious way here.
127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128 $(if $(abs_objtree),, \
129 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
130
131 # $(realpath ...) resolves symlinks
132 abs_objtree := $(realpath $(abs_objtree))
133 else
134 abs_objtree := $(CURDIR)
135 endif # ifneq ($(KBUILD_OUTPUT),)
136
137 ifeq ($(abs_objtree),$(CURDIR))
138 # Suppress "Entering directory ..." unless we are changing the work directory.
139 MAKEFLAGS += --no-print-directory
140 else
141 need-sub-make := 1
142 endif
143
144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
145
146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147 $(error source directory cannot contain spaces or colons)
148 endif
149
150 ifneq ($(abs_srctree),$(abs_objtree))
151 # Look for make include files relative to root of kernel src
152 #
153 # This does not become effective immediately because MAKEFLAGS is re-parsed
154 # once after the Makefile is read. We need to invoke sub-make.
155 MAKEFLAGS += --include-dir=$(abs_srctree)
156 need-sub-make := 1
157 endif
158
159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
162 need-sub-make := 1
163 # Cancel implicit rules for this Makefile.
164 $(lastword $(MAKEFILE_LIST)): ;
165 endif
166
167 export abs_srctree abs_objtree
168 export sub_make_done := 1
169
170 ifeq ($(need-sub-make),1)
171
172 PHONY += $(MAKECMDGOALS) sub-make
173
174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
175 @:
176
177 # Invoke a second make in the output directory, passing relevant variables
178 sub-make:
179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
180
181 endif # need-sub-make
182 endif # sub_make_done
183
184 # We process the rest of the Makefile if this is the final invocation of make
185 ifeq ($(need-sub-make),)
186
187 # Do not print "Entering directory ...",
188 # but we want to display it when entering to the output directory
189 # so that IDEs/editors are able to understand relative filenames.
190 MAKEFLAGS += --no-print-directory
191
192 # Call a source code checker (by default, "sparse") as part of the
193 # C compilation.
194 #
195 # Use 'make C=1' to enable checking of only re-compiled files.
196 # Use 'make C=2' to enable checking of *all* source files, regardless
197 # of whether they are re-compiled or not.
198 #
199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
200 # including where to get the "sparse" utility.
201
202 ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC = $(C)
204 endif
205 ifndef KBUILD_CHECKSRC
206 KBUILD_CHECKSRC = 0
207 endif
208
209 # Use make M=dir to specify directory of external module to build
210 # Old syntax make ... SUBDIRS=$PWD is still supported
211 # Setting the environment variable KBUILD_EXTMOD take precedence
212 ifdef SUBDIRS
213 $(warning ================= WARNING ================)
214 $(warning 'SUBDIRS' will be removed after Linux 5.3)
215 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
216 $(warning ==========================================)
217 KBUILD_EXTMOD ?= $(SUBDIRS)
218 endif
219
220 ifeq ("$(origin M)", "command line")
221 KBUILD_EXTMOD := $(M)
222 endif
223
224 ifeq ($(abs_srctree),$(abs_objtree))
225 # building in the source tree
226 srctree := .
227 else
228 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
229 # building in a subdirectory of the source tree
230 srctree := ..
231 else
232 srctree := $(abs_srctree)
233 endif
234
235 # TODO:
236 # KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.
237 # Replace it with $(srctree) or something.
238 KBUILD_SRC := $(abs_srctree)
239 endif
240
241 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
242
243 objtree := .
244 src := $(srctree)
245 obj := $(objtree)
246
247 VPATH := $(srctree)
248
249 export srctree objtree VPATH
250
251 # To make sure we do not include .config for any of the *config targets
252 # catch them early, and hand them over to scripts/kconfig/Makefile
253 # It is allowed to specify more targets when calling make, including
254 # mixing *config targets and build targets.
255 # For example 'make oldconfig all'.
256 # Detect when mixed targets is specified, and make a second invocation
257 # of make so .config is not included in this case either (for *config).
258
259 version_h := include/generated/uapi/linux/version.h
260 old_version_h := include/linux/version.h
261
262 clean-targets := %clean mrproper cleandocs
263 no-dot-config-targets := $(clean-targets) \
264 cscope gtags TAGS tags help% %docs check% coccicheck \
265 $(version_h) headers_% archheaders archscripts \
266 %asm-generic kernelversion %src-pkg
267 no-sync-config-targets := $(no-dot-config-targets) install %install \
268 kernelrelease
269
270 config-targets := 0
271 mixed-targets := 0
272 dot-config := 1
273 may-sync-config := 1
274
275 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
276 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
277 dot-config := 0
278 endif
279 endif
280
281 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
282 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
283 may-sync-config := 0
284 endif
285 endif
286
287 ifneq ($(KBUILD_EXTMOD),)
288 may-sync-config := 0
289 endif
290
291 ifeq ($(KBUILD_EXTMOD),)
292 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
293 config-targets := 1
294 ifneq ($(words $(MAKECMDGOALS)),1)
295 mixed-targets := 1
296 endif
297 endif
298 endif
299
300 # For "make -j clean all", "make -j mrproper defconfig all", etc.
301 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
302 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
303 mixed-targets := 1
304 endif
305 endif
306
307 # install and modules_install need also be processed one by one
308 ifneq ($(filter install,$(MAKECMDGOALS)),)
309 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
310 mixed-targets := 1
311 endif
312 endif
313
314 ifeq ($(mixed-targets),1)
315 # ===========================================================================
316 # We're called with mixed targets (*config and build targets).
317 # Handle them one by one.
318
319 PHONY += $(MAKECMDGOALS) __build_one_by_one
320
321 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
322 @:
323
324 __build_one_by_one:
325 $(Q)set -e; \
326 for i in $(MAKECMDGOALS); do \
327 $(MAKE) -f $(srctree)/Makefile $$i; \
328 done
329
330 else
331
332 include scripts/Kbuild.include
333
334 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
335 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
336 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
337 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
338
339 include scripts/subarch.include
340
341 # Cross compiling and selecting different set of gcc/bin-utils
342 # ---------------------------------------------------------------------------
343 #
344 # When performing cross compilation for other architectures ARCH shall be set
345 # to the target architecture. (See arch/* for the possibilities).
346 # ARCH can be set during invocation of make:
347 # make ARCH=ia64
348 # Another way is to have ARCH set in the environment.
349 # The default ARCH is the host where make is executed.
350
351 # CROSS_COMPILE specify the prefix used for all executables used
352 # during compilation. Only gcc and related bin-utils executables
353 # are prefixed with $(CROSS_COMPILE).
354 # CROSS_COMPILE can be set on the command line
355 # make CROSS_COMPILE=ia64-linux-
356 # Alternatively CROSS_COMPILE can be set in the environment.
357 # Default value for CROSS_COMPILE is not to prefix executables
358 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
359 ARCH ?= $(SUBARCH)
360
361 # Architecture as present in compile.h
362 UTS_MACHINE := $(ARCH)
363 SRCARCH := $(ARCH)
364
365 # Additional ARCH settings for x86
366 ifeq ($(ARCH),i386)
367 SRCARCH := x86
368 endif
369 ifeq ($(ARCH),x86_64)
370 SRCARCH := x86
371 endif
372
373 # Additional ARCH settings for sparc
374 ifeq ($(ARCH),sparc32)
375 SRCARCH := sparc
376 endif
377 ifeq ($(ARCH),sparc64)
378 SRCARCH := sparc
379 endif
380
381 # Additional ARCH settings for sh
382 ifeq ($(ARCH),sh64)
383 SRCARCH := sh
384 endif
385
386 KCONFIG_CONFIG ?= .config
387 export KCONFIG_CONFIG
388
389 # SHELL used by kbuild
390 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
391 else if [ -x /bin/bash ]; then echo /bin/bash; \
392 else echo sh; fi ; fi)
393
394 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
395 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
396 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
397
398 HOSTCC = gcc
399 HOSTCXX = g++
400 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
401 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
402 $(HOSTCFLAGS)
403 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
404 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
405 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
406
407 # Make variables (CC, etc...)
408 AS = $(CROSS_COMPILE)as
409 LD = $(CROSS_COMPILE)ld
410 CC = $(CROSS_COMPILE)gcc
411 CPP = $(CC) -E
412 AR = $(CROSS_COMPILE)ar
413 NM = $(CROSS_COMPILE)nm
414 STRIP = $(CROSS_COMPILE)strip
415 OBJCOPY = $(CROSS_COMPILE)objcopy
416 OBJDUMP = $(CROSS_COMPILE)objdump
417 PAHOLE = pahole
418 LEX = flex
419 YACC = bison
420 AWK = awk
421 INSTALLKERNEL := installkernel
422 DEPMOD = /sbin/depmod
423 PERL = perl
424 PYTHON = python
425 PYTHON2 = python2
426 PYTHON3 = python3
427 CHECK = sparse
428
429 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
430 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
431 NOSTDINC_FLAGS :=
432 CFLAGS_MODULE =
433 AFLAGS_MODULE =
434 LDFLAGS_MODULE =
435 CFLAGS_KERNEL =
436 AFLAGS_KERNEL =
437 LDFLAGS_vmlinux =
438
439 # Use USERINCLUDE when you must reference the UAPI directories only.
440 USERINCLUDE := \
441 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
442 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
443 -I$(srctree)/include/uapi \
444 -I$(objtree)/include/generated/uapi \
445 -include $(srctree)/include/linux/kconfig.h
446
447 # Use LINUXINCLUDE when you must reference the include/ directory.
448 # Needed to be compatible with the O= option
449 LINUXINCLUDE := \
450 -I$(srctree)/arch/$(SRCARCH)/include \
451 -I$(objtree)/arch/$(SRCARCH)/include/generated \
452 $(if $(filter .,$(srctree)),,-I$(srctree)/include) \
453 -I$(objtree)/include \
454 $(USERINCLUDE)
455
456 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
457 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
458 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
459 -Werror=implicit-function-declaration -Werror=implicit-int \
460 -Wno-format-security \
461 -std=gnu89
462 KBUILD_CPPFLAGS := -D__KERNEL__
463 KBUILD_AFLAGS_KERNEL :=
464 KBUILD_CFLAGS_KERNEL :=
465 KBUILD_AFLAGS_MODULE := -DMODULE
466 KBUILD_CFLAGS_MODULE := -DMODULE
467 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
468 KBUILD_LDFLAGS :=
469 GCC_PLUGINS_CFLAGS :=
470
471 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
472 export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
473 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
474 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
475
476 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
477 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
478 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
479 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
480 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
481 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
482 export KBUILD_ARFLAGS
483
484 # When compiling out-of-tree modules, put MODVERDIR in the module
485 # tree rather than in the kernel tree. The kernel tree might
486 # even be read-only.
487 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
488
489 # Files to ignore in find ... statements
490
491 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
492 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
493 -prune -o
494 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
495 --exclude CVS --exclude .pc --exclude .hg --exclude .git
496
497 # ===========================================================================
498 # Rules shared between *config targets and build targets
499
500 # Basic helpers built in scripts/basic/
501 PHONY += scripts_basic
502 scripts_basic:
503 $(Q)$(MAKE) $(build)=scripts/basic
504 $(Q)rm -f .tmp_quiet_recordmcount
505
506 PHONY += outputmakefile
507 # outputmakefile generates a Makefile in the output directory, if using a
508 # separate output directory. This allows convenient use of make in the
509 # output directory.
510 # At the same time when output Makefile generated, generate .gitignore to
511 # ignore whole output directory
512 outputmakefile:
513 ifneq ($(srctree),.)
514 $(Q)ln -fsn $(srctree) source
515 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
516 $(Q)test -e .gitignore || \
517 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
518 endif
519
520 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
521 ifneq ($(CROSS_COMPILE),)
522 CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
523 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
524 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
525 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
526 endif
527 ifneq ($(GCC_TOOLCHAIN),)
528 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
529 endif
530 CLANG_FLAGS += -no-integrated-as
531 KBUILD_CFLAGS += $(CLANG_FLAGS)
532 KBUILD_AFLAGS += $(CLANG_FLAGS)
533 export CLANG_FLAGS
534 endif
535
536 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
537 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
538 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
539 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
540 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
541
542 ifeq ($(config-targets),1)
543 # ===========================================================================
544 # *config targets only - make sure prerequisites are updated, and descend
545 # in scripts/kconfig to make the *config target
546
547 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
548 # KBUILD_DEFCONFIG may point out an alternative default configuration
549 # used for 'make defconfig'
550 include arch/$(SRCARCH)/Makefile
551 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
552
553 config: scripts_basic outputmakefile FORCE
554 $(Q)$(MAKE) $(build)=scripts/kconfig $@
555
556 %config: scripts_basic outputmakefile FORCE
557 $(Q)$(MAKE) $(build)=scripts/kconfig $@
558
559 else
560 # ===========================================================================
561 # Build targets only - this includes vmlinux, arch specific targets, clean
562 # targets and others. In general all targets except *config targets.
563
564 # If building an external module we do not care about the all: rule
565 # but instead _all depend on modules
566 PHONY += all
567 ifeq ($(KBUILD_EXTMOD),)
568 _all: all
569 else
570 _all: modules
571 endif
572
573 # Decide whether to build built-in, modular, or both.
574 # Normally, just do built-in.
575
576 KBUILD_MODULES :=
577 KBUILD_BUILTIN := 1
578
579 # If we have only "make modules", don't compile built-in objects.
580 # When we're building modules with modversions, we need to consider
581 # the built-in objects during the descend as well, in order to
582 # make sure the checksums are up to date before we record them.
583
584 ifeq ($(MAKECMDGOALS),modules)
585 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
586 endif
587
588 # If we have "make <whatever> modules", compile modules
589 # in addition to whatever we do anyway.
590 # Just "make" or "make all" shall build modules as well
591
592 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
593 KBUILD_MODULES := 1
594 endif
595
596 ifeq ($(MAKECMDGOALS),)
597 KBUILD_MODULES := 1
598 endif
599
600 export KBUILD_MODULES KBUILD_BUILTIN
601
602 ifeq ($(dot-config),1)
603 include include/config/auto.conf
604 endif
605
606 ifeq ($(KBUILD_EXTMOD),)
607 # Objects we will link into vmlinux / subdirs we need to visit
608 init-y := init/
609 drivers-y := drivers/ sound/
610 drivers-$(CONFIG_SAMPLES) += samples/
611 net-y := net/
612 libs-y := lib/
613 core-y := usr/
614 virt-y := virt/
615 endif # KBUILD_EXTMOD
616
617 # The all: target is the default when no target is given on the
618 # command line.
619 # This allow a user to issue only 'make' to build a kernel including modules
620 # Defaults to vmlinux, but the arch makefile usually adds further targets
621 all: vmlinux
622
623 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
624 $(call cc-option,-fno-tree-loop-im) \
625 $(call cc-disable-warning,maybe-uninitialized,)
626 export CFLAGS_GCOV
627
628 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
629 ifdef CONFIG_FUNCTION_TRACER
630 CC_FLAGS_FTRACE := -pg
631 endif
632
633 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
634 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
635 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
636 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
637 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
638 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
639 export RETPOLINE_CFLAGS
640 export RETPOLINE_VDSO_CFLAGS
641
642 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
643 # values of the respective KBUILD_* variables
644 ARCH_CPPFLAGS :=
645 ARCH_AFLAGS :=
646 ARCH_CFLAGS :=
647 include arch/$(SRCARCH)/Makefile
648
649 ifeq ($(dot-config),1)
650 ifeq ($(may-sync-config),1)
651 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
652 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
653 # because some architectures define CROSS_COMPILE there.
654 include include/config/auto.conf.cmd
655
656 $(KCONFIG_CONFIG):
657 @echo >&2 '***'
658 @echo >&2 '*** Configuration file "$@" not found!'
659 @echo >&2 '***'
660 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
661 @echo >&2 '*** "make menuconfig" or "make xconfig").'
662 @echo >&2 '***'
663 @/bin/false
664
665 # The actual configuration files used during the build are stored in
666 # include/generated/ and include/config/. Update them if .config is newer than
667 # include/config/auto.conf (which mirrors .config).
668 #
669 # This exploits the 'multi-target pattern rule' trick.
670 # The syncconfig should be executed only once to make all the targets.
671 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
672 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
673 else
674 # External modules and some install targets need include/generated/autoconf.h
675 # and include/config/auto.conf but do not care if they are up-to-date.
676 # Use auto.conf to trigger the test
677 PHONY += include/config/auto.conf
678
679 include/config/auto.conf:
680 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
681 echo >&2; \
682 echo >&2 " ERROR: Kernel configuration is invalid."; \
683 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
684 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
685 echo >&2 ; \
686 /bin/false)
687
688 endif # may-sync-config
689 endif # $(dot-config)
690
691 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
692 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
693 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
694 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
695 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
696
697 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
698 KBUILD_CFLAGS += -Os
699 else
700 KBUILD_CFLAGS += -O2
701 endif
702
703 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
704 KBUILD_CFLAGS += -Wno-maybe-uninitialized
705 endif
706
707 # Tell gcc to never replace conditional load with a non-conditional one
708 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
709
710 include scripts/Makefile.kcov
711 include scripts/Makefile.gcc-plugins
712
713 ifdef CONFIG_READABLE_ASM
714 # Disable optimizations that make assembler listings hard to read.
715 # reorder blocks reorders the control in the function
716 # ipa clone creates specialized cloned functions
717 # partial inlining inlines only parts of functions
718 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
719 $(call cc-option,-fno-ipa-cp-clone,) \
720 $(call cc-option,-fno-partial-inlining)
721 endif
722
723 ifneq ($(CONFIG_FRAME_WARN),0)
724 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
725 endif
726
727 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
728 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
729 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
730
731 KBUILD_CFLAGS += $(stackp-flags-y)
732
733 ifdef CONFIG_CC_IS_CLANG
734 KBUILD_CPPFLAGS += -Qunused-arguments
735 KBUILD_CFLAGS += -Wno-format-invalid-specifier
736 KBUILD_CFLAGS += -Wno-gnu
737 # Quiet clang warning: comparison of unsigned expression < 0 is always false
738 KBUILD_CFLAGS += -Wno-tautological-compare
739 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
740 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
741 # See modpost pattern 2
742 KBUILD_CFLAGS += -mno-global-merge
743 else
744
745 # These warnings generated too much noise in a regular build.
746 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
747 KBUILD_CFLAGS += -Wno-unused-but-set-variable
748 endif
749
750 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
751 ifdef CONFIG_FRAME_POINTER
752 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
753 else
754 # Some targets (ARM with Thumb2, for example), can't be built with frame
755 # pointers. For those, we don't have FUNCTION_TRACER automatically
756 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
757 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
758 # -fomit-frame-pointer with FUNCTION_TRACER.
759 ifndef CONFIG_FUNCTION_TRACER
760 KBUILD_CFLAGS += -fomit-frame-pointer
761 endif
762 endif
763
764 # Initialize all stack variables with a pattern, if desired.
765 ifdef CONFIG_INIT_STACK_ALL
766 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
767 endif
768
769 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
770
771 ifdef CONFIG_DEBUG_INFO
772 ifdef CONFIG_DEBUG_INFO_SPLIT
773 DEBUG_CFLAGS += -gsplit-dwarf
774 else
775 DEBUG_CFLAGS += -g
776 endif
777 KBUILD_AFLAGS += -Wa,-gdwarf-2
778 endif
779 ifdef CONFIG_DEBUG_INFO_DWARF4
780 DEBUG_CFLAGS += -gdwarf-4
781 endif
782
783 ifdef CONFIG_DEBUG_INFO_REDUCED
784 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
785 $(call cc-option,-fno-var-tracking)
786 endif
787
788 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
789 export DEBUG_CFLAGS
790
791 ifdef CONFIG_FUNCTION_TRACER
792 ifdef CONFIG_FTRACE_MCOUNT_RECORD
793 # gcc 5 supports generating the mcount tables directly
794 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
795 CC_FLAGS_FTRACE += -mrecord-mcount
796 export CC_USING_RECORD_MCOUNT := 1
797 endif
798 ifdef CONFIG_HAVE_NOP_MCOUNT
799 ifeq ($(call cc-option-yn, -mnop-mcount),y)
800 CC_FLAGS_FTRACE += -mnop-mcount
801 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
802 endif
803 endif
804 endif
805 ifdef CONFIG_HAVE_FENTRY
806 ifeq ($(call cc-option-yn, -mfentry),y)
807 CC_FLAGS_FTRACE += -mfentry
808 CC_FLAGS_USING += -DCC_USING_FENTRY
809 endif
810 endif
811 export CC_FLAGS_FTRACE
812 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
813 KBUILD_AFLAGS += $(CC_FLAGS_USING)
814 ifdef CONFIG_DYNAMIC_FTRACE
815 ifdef CONFIG_HAVE_C_RECORDMCOUNT
816 BUILD_C_RECORDMCOUNT := y
817 export BUILD_C_RECORDMCOUNT
818 endif
819 endif
820 endif
821
822 # We trigger additional mismatches with less inlining
823 ifdef CONFIG_DEBUG_SECTION_MISMATCH
824 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
825 endif
826
827 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
828 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
829 LDFLAGS_vmlinux += --gc-sections
830 endif
831
832 ifdef CONFIG_LIVEPATCH
833 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
834 endif
835
836 # arch Makefile may override CC so keep this after arch Makefile is included
837 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
838
839 # warn about C99 declaration after statement
840 KBUILD_CFLAGS += -Wdeclaration-after-statement
841
842 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
843 KBUILD_CFLAGS += -Wvla
844
845 # disable pointer signed / unsigned warnings in gcc 4.0
846 KBUILD_CFLAGS += -Wno-pointer-sign
847
848 # disable stringop warnings in gcc 8+
849 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
850
851 # disable invalid "can't wrap" optimizations for signed / pointers
852 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
853
854 # clang sets -fmerge-all-constants by default as optimization, but this
855 # is non-conforming behavior for C and in fact breaks the kernel, so we
856 # need to disable it here generally.
857 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
858
859 # for gcc -fno-merge-all-constants disables everything, but it is fine
860 # to have actual conforming behavior enabled.
861 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
862
863 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
864 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
865
866 # conserve stack if available
867 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
868
869 # Prohibit date/time macros, which would make the build non-deterministic
870 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
871
872 # enforce correct pointer usage
873 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
874
875 # Require designated initializers for all marked structures
876 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
877
878 # change __FILE__ to the relative path from the srctree
879 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
880
881 # use the deterministic mode of AR if available
882 KBUILD_ARFLAGS := $(call ar-option,D)
883
884 include scripts/Makefile.kasan
885 include scripts/Makefile.extrawarn
886 include scripts/Makefile.ubsan
887
888 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
889 # last assignments
890 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
891 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
892 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
893
894 # Use --build-id when available.
895 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
896 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
897 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
898
899 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
900 LDFLAGS_vmlinux += $(call ld-option, -X,)
901 endif
902
903 # insure the checker run with the right endianness
904 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
905
906 # the checker needs the correct machine size
907 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
908
909 # Default kernel image to build when no specific target is given.
910 # KBUILD_IMAGE may be overruled on the command line or
911 # set in the environment
912 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
913 # this default value
914 export KBUILD_IMAGE ?= vmlinux
915
916 #
917 # INSTALL_PATH specifies where to place the updated kernel and system map
918 # images. Default is /boot, but you can set it to other values
919 export INSTALL_PATH ?= /boot
920
921 #
922 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
923 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
924 # an argument if needed. Otherwise it defaults to the kernel install path
925 #
926 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
927
928 #
929 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
930 # relocations required by build roots. This is not defined in the
931 # makefile but the argument can be passed to make if needed.
932 #
933
934 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
935 export MODLIB
936
937 #
938 # INSTALL_MOD_STRIP, if defined, will cause modules to be
939 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
940 # the default option --strip-debug will be used. Otherwise,
941 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
942
943 ifdef INSTALL_MOD_STRIP
944 ifeq ($(INSTALL_MOD_STRIP),1)
945 mod_strip_cmd = $(STRIP) --strip-debug
946 else
947 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
948 endif # INSTALL_MOD_STRIP=1
949 else
950 mod_strip_cmd = true
951 endif # INSTALL_MOD_STRIP
952 export mod_strip_cmd
953
954 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
955 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
956 # or CONFIG_MODULE_COMPRESS_XZ.
957
958 mod_compress_cmd = true
959 ifdef CONFIG_MODULE_COMPRESS
960 ifdef CONFIG_MODULE_COMPRESS_GZIP
961 mod_compress_cmd = gzip -n -f
962 endif # CONFIG_MODULE_COMPRESS_GZIP
963 ifdef CONFIG_MODULE_COMPRESS_XZ
964 mod_compress_cmd = xz -f
965 endif # CONFIG_MODULE_COMPRESS_XZ
966 endif # CONFIG_MODULE_COMPRESS
967 export mod_compress_cmd
968
969 ifdef CONFIG_MODULE_SIG_ALL
970 $(eval $(call config_filename,MODULE_SIG_KEY))
971
972 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
973 else
974 mod_sign_cmd = true
975 endif
976 export mod_sign_cmd
977
978 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
979
980 ifdef CONFIG_STACK_VALIDATION
981 has_libelf := $(call try-run,\
982 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
983 ifeq ($(has_libelf),1)
984 objtool_target := tools/objtool FORCE
985 else
986 SKIP_STACK_VALIDATION := 1
987 export SKIP_STACK_VALIDATION
988 endif
989 endif
990
991 PHONY += prepare0
992
993 ifeq ($(KBUILD_EXTMOD),)
994 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
995
996 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
997 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
998 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
999
1000 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1001 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1002 $(drivers-) $(net-) $(libs-) $(virt-))))
1003
1004 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1005 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1006 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1007 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1008 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1009 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1010 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1011
1012 # Externally visible symbols (used by link-vmlinux.sh)
1013 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1014 $(drivers-y) $(net-y) $(virt-y)
1015 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1016 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1017 export LDFLAGS_vmlinux
1018 # used by scripts/package/Makefile
1019 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1020
1021 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1022
1023 # Recurse until adjust_autoksyms.sh is satisfied
1024 PHONY += autoksyms_recursive
1025 autoksyms_recursive: $(vmlinux-deps)
1026 ifdef CONFIG_TRIM_UNUSED_KSYMS
1027 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1028 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1029 endif
1030
1031 # For the kernel to actually contain only the needed exported symbols,
1032 # we have to build modules as well to determine what those symbols are.
1033 # (this can be evaluated only once include/config/auto.conf has been included)
1034 ifdef CONFIG_TRIM_UNUSED_KSYMS
1035 KBUILD_MODULES := 1
1036 endif
1037
1038 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1039
1040 $(autoksyms_h):
1041 $(Q)mkdir -p $(dir $@)
1042 $(Q)touch $@
1043
1044 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1045
1046 # Final link of vmlinux with optional arch pass after final link
1047 cmd_link-vmlinux = \
1048 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1049 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1050
1051 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1052 +$(call if_changed,link-vmlinux)
1053
1054 targets := vmlinux
1055
1056 # Some samples need headers_install.
1057 samples: headers_install
1058
1059 # The actual objects are generated when descending,
1060 # make sure no implicit rule kicks in
1061 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1062
1063 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1064 # Preset locale variables to speed up the build process. Limit locale
1065 # tweaks to this spot to avoid wrong language settings when running
1066 # make menuconfig etc.
1067 # Error messages still appears in the original language
1068
1069 PHONY += $(vmlinux-dirs)
1070 $(vmlinux-dirs): prepare
1071 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1072
1073 filechk_kernel.release = \
1074 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1075
1076 # Store (new) KERNELRELEASE string in include/config/kernel.release
1077 include/config/kernel.release: FORCE
1078 $(call filechk,kernel.release)
1079
1080 # Additional helpers built in scripts/
1081 # Carefully list dependencies so we do not try to build scripts twice
1082 # in parallel
1083 PHONY += scripts
1084 scripts: scripts_basic scripts_dtc
1085 $(Q)$(MAKE) $(build)=$(@)
1086
1087 # Things we need to do before we recursively start building the kernel
1088 # or the modules are listed in "prepare".
1089 # A multi level approach is used. prepareN is processed before prepareN-1.
1090 # archprepare is used in arch Makefiles and when processed asm symlink,
1091 # version.h and scripts_basic is processed / created.
1092
1093 PHONY += prepare archprepare prepare1 prepare3
1094
1095 # prepare3 is used to check if we are building in a separate output directory,
1096 # and if so do:
1097 # 1) Check that make has not been executed in the kernel src $(srctree)
1098 prepare3: include/config/kernel.release
1099 ifneq ($(srctree),.)
1100 @$(kecho) ' Using $(srctree) as source for kernel'
1101 $(Q)if [ -f $(srctree)/.config -o \
1102 -d $(srctree)/include/config -o \
1103 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1104 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1105 echo >&2 " in the '$(srctree)' directory.";\
1106 /bin/false; \
1107 fi;
1108 endif
1109
1110 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1111 include/generated/utsrelease.h
1112 $(cmd_crmodverdir)
1113
1114 archprepare: archheaders archscripts prepare1 scripts
1115
1116 prepare0: archprepare
1117 $(Q)$(MAKE) $(build)=scripts/mod
1118 $(Q)$(MAKE) $(build)=.
1119
1120 # All the preparing..
1121 prepare: prepare0 prepare-objtool
1122
1123 # Support for using generic headers in asm-generic
1124 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1125
1126 PHONY += asm-generic uapi-asm-generic
1127 asm-generic: uapi-asm-generic
1128 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1129 generic=include/asm-generic
1130 uapi-asm-generic:
1131 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1132 generic=include/uapi/asm-generic
1133
1134 PHONY += prepare-objtool
1135 prepare-objtool: $(objtool_target)
1136 ifeq ($(SKIP_STACK_VALIDATION),1)
1137 ifdef CONFIG_UNWINDER_ORC
1138 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1139 @false
1140 else
1141 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1142 endif
1143 endif
1144
1145 # Generate some files
1146 # ---------------------------------------------------------------------------
1147
1148 # KERNELRELEASE can change from a few different places, meaning version.h
1149 # needs to be updated, so this check is forced on all builds
1150
1151 uts_len := 64
1152 define filechk_utsrelease.h
1153 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1154 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1155 exit 1; \
1156 fi; \
1157 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1158 endef
1159
1160 define filechk_version.h
1161 echo \#define LINUX_VERSION_CODE $(shell \
1162 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1163 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1164 endef
1165
1166 $(version_h): FORCE
1167 $(call filechk,version.h)
1168 $(Q)rm -f $(old_version_h)
1169
1170 include/generated/utsrelease.h: include/config/kernel.release FORCE
1171 $(call filechk,utsrelease.h)
1172
1173 PHONY += headerdep
1174 headerdep:
1175 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1176 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1177
1178 # ---------------------------------------------------------------------------
1179 # Kernel headers
1180
1181 #Default location for installed headers
1182 export INSTALL_HDR_PATH = $(objtree)/usr
1183
1184 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1185 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1186
1187 PHONY += archheaders archscripts
1188
1189 PHONY += __headers
1190 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1191 $(Q)$(MAKE) $(build)=scripts build_unifdef
1192
1193 PHONY += headers_install_all
1194 headers_install_all:
1195 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1196
1197 PHONY += headers_install
1198 headers_install: __headers
1199 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1200 $(error Headers not exportable for the $(SRCARCH) architecture))
1201 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1202 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1203
1204 PHONY += headers_check_all
1205 headers_check_all: headers_install_all
1206 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1207
1208 PHONY += headers_check
1209 headers_check: headers_install
1210 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1211 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1212
1213 ifdef CONFIG_HEADERS_CHECK
1214 all: headers_check
1215 endif
1216
1217 # ---------------------------------------------------------------------------
1218 # Kernel selftest
1219
1220 PHONY += kselftest
1221 kselftest:
1222 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1223
1224 PHONY += kselftest-clean
1225 kselftest-clean:
1226 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1227
1228 PHONY += kselftest-merge
1229 kselftest-merge:
1230 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1231 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1232 -m $(objtree)/.config \
1233 $(srctree)/tools/testing/selftests/*/config
1234 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1235
1236 # ---------------------------------------------------------------------------
1237 # Devicetree files
1238
1239 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1240 dtstree := arch/$(SRCARCH)/boot/dts
1241 endif
1242
1243 ifneq ($(dtstree),)
1244
1245 %.dtb: prepare3 scripts_dtc
1246 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1247
1248 PHONY += dtbs dtbs_install dt_binding_check
1249 dtbs dtbs_check: prepare3 scripts_dtc
1250 $(Q)$(MAKE) $(build)=$(dtstree)
1251
1252 dtbs_check: export CHECK_DTBS=1
1253 dtbs_check: dt_binding_check
1254
1255 dtbs_install:
1256 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1257
1258 ifdef CONFIG_OF_EARLY_FLATTREE
1259 all: dtbs
1260 endif
1261
1262 endif
1263
1264 PHONY += scripts_dtc
1265 scripts_dtc: scripts_basic
1266 $(Q)$(MAKE) $(build)=scripts/dtc
1267
1268 dt_binding_check: scripts_dtc
1269 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1270
1271 # ---------------------------------------------------------------------------
1272 # Modules
1273
1274 ifdef CONFIG_MODULES
1275
1276 # By default, build modules as well
1277
1278 all: modules
1279
1280 # Build modules
1281 #
1282 # A module can be listed more than once in obj-m resulting in
1283 # duplicate lines in modules.order files. Those are removed
1284 # using awk while concatenating to the final file.
1285
1286 PHONY += modules
1287 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1288 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1289 @$(kecho) ' Building modules, stage 2.';
1290 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1291 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1292
1293 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1294 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1295
1296 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1297 $(Q)$(MAKE) $(modbuiltin)=$*
1298
1299
1300 # Target to prepare building external modules
1301 PHONY += modules_prepare
1302 modules_prepare: prepare
1303
1304 # Target to install modules
1305 PHONY += modules_install
1306 modules_install: _modinst_ _modinst_post
1307
1308 PHONY += _modinst_
1309 _modinst_:
1310 @rm -rf $(MODLIB)/kernel
1311 @rm -f $(MODLIB)/source
1312 @mkdir -p $(MODLIB)/kernel
1313 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1314 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1315 rm -f $(MODLIB)/build ; \
1316 ln -s $(CURDIR) $(MODLIB)/build ; \
1317 fi
1318 @cp -f $(objtree)/modules.order $(MODLIB)/
1319 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1320 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1321 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1322
1323 # This depmod is only for convenience to give the initial
1324 # boot a modules.dep even before / is mounted read-write. However the
1325 # boot script depmod is the master version.
1326 PHONY += _modinst_post
1327 _modinst_post: _modinst_
1328 $(call cmd,depmod)
1329
1330 ifeq ($(CONFIG_MODULE_SIG), y)
1331 PHONY += modules_sign
1332 modules_sign:
1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1334 endif
1335
1336 else # CONFIG_MODULES
1337
1338 # Modules not configured
1339 # ---------------------------------------------------------------------------
1340
1341 PHONY += modules modules_install
1342 modules modules_install:
1343 @echo >&2
1344 @echo >&2 "The present kernel configuration has modules disabled."
1345 @echo >&2 "Type 'make config' and enable loadable module support."
1346 @echo >&2 "Then build a kernel with module support enabled."
1347 @echo >&2
1348 @exit 1
1349
1350 endif # CONFIG_MODULES
1351
1352 ###
1353 # Cleaning is done on three levels.
1354 # make clean Delete most generated files
1355 # Leave enough to build external modules
1356 # make mrproper Delete the current configuration, and all generated files
1357 # make distclean Remove editor backup files, patch leftover files and the like
1358
1359 # Directories & files removed with 'make clean'
1360 CLEAN_DIRS += $(MODVERDIR) include/ksym
1361 CLEAN_FILES += modules.builtin.modinfo
1362
1363 # Directories & files removed with 'make mrproper'
1364 MRPROPER_DIRS += include/config usr/include include/generated \
1365 arch/$(SRCARCH)/include/generated .tmp_objdiff
1366 MRPROPER_FILES += .config .config.old .version \
1367 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1368 signing_key.pem signing_key.priv signing_key.x509 \
1369 x509.genkey extra_certificates signing_key.x509.keyid \
1370 signing_key.x509.signer vmlinux-gdb.py
1371
1372 # clean - Delete most, but leave enough to build external modules
1373 #
1374 clean: rm-dirs := $(CLEAN_DIRS)
1375 clean: rm-files := $(CLEAN_FILES)
1376 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs))
1377
1378 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1379 $(clean-dirs):
1380 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1381
1382 vmlinuxclean:
1383 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1384 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1385
1386 clean: archclean vmlinuxclean
1387
1388 # mrproper - Delete all generated files, including .config
1389 #
1390 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1391 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1392 mrproper-dirs := $(addprefix _mrproper_,scripts)
1393
1394 PHONY += $(mrproper-dirs) mrproper
1395 $(mrproper-dirs):
1396 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1397
1398 mrproper: clean $(mrproper-dirs)
1399 $(call cmd,rmdirs)
1400 $(call cmd,rmfiles)
1401
1402 # distclean
1403 #
1404 PHONY += distclean
1405
1406 distclean: mrproper
1407 @find $(srctree) $(RCS_FIND_IGNORE) \
1408 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1409 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1410 -o -name 'core' \) \
1411 -type f -print | xargs rm -f
1412
1413
1414 # Packaging of the kernel to various formats
1415 # ---------------------------------------------------------------------------
1416 package-dir := scripts/package
1417
1418 %src-pkg: FORCE
1419 $(Q)$(MAKE) $(build)=$(package-dir) $@
1420 %pkg: include/config/kernel.release FORCE
1421 $(Q)$(MAKE) $(build)=$(package-dir) $@
1422
1423
1424 # Brief documentation of the typical targets used
1425 # ---------------------------------------------------------------------------
1426
1427 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1428 boards := $(sort $(notdir $(boards)))
1429 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1430 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1431
1432 PHONY += help
1433 help:
1434 @echo 'Cleaning targets:'
1435 @echo ' clean - Remove most generated files but keep the config and'
1436 @echo ' enough build support to build external modules'
1437 @echo ' mrproper - Remove all generated files + config + various backup files'
1438 @echo ' distclean - mrproper + remove editor backup and patch files'
1439 @echo ''
1440 @echo 'Configuration targets:'
1441 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1442 @echo ''
1443 @echo 'Other generic targets:'
1444 @echo ' all - Build all targets marked with [*]'
1445 @echo '* vmlinux - Build the bare kernel'
1446 @echo '* modules - Build all modules'
1447 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1448 @echo ' dir/ - Build all files in dir and below'
1449 @echo ' dir/file.[ois] - Build specified target only'
1450 @echo ' dir/file.ll - Build the LLVM assembly file'
1451 @echo ' (requires compiler support for LLVM assembly generation)'
1452 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1453 @echo ' (requires a recent binutils and recent build (System.map))'
1454 @echo ' dir/file.ko - Build module including final link'
1455 @echo ' modules_prepare - Set up for building external modules'
1456 @echo ' tags/TAGS - Generate tags file for editors'
1457 @echo ' cscope - Generate cscope index'
1458 @echo ' gtags - Generate GNU GLOBAL index'
1459 @echo ' kernelrelease - Output the release version string (use with make -s)'
1460 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1461 @echo ' image_name - Output the image name (use with make -s)'
1462 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1463 echo ' (default: $(INSTALL_HDR_PATH))'; \
1464 echo ''
1465 @echo 'Static analysers:'
1466 @echo ' checkstack - Generate a list of stack hogs'
1467 @echo ' namespacecheck - Name space analysis on compiled kernel'
1468 @echo ' versioncheck - Sanity check on version.h usage'
1469 @echo ' includecheck - Check for duplicate included header files'
1470 @echo ' export_report - List the usages of all exported symbols'
1471 @echo ' headers_check - Sanity check on exported headers'
1472 @echo ' headerdep - Detect inclusion cycles in headers'
1473 @echo ' coccicheck - Check with Coccinelle'
1474 @echo ''
1475 @echo 'Kernel selftest:'
1476 @echo ' kselftest - Build and run kernel selftest (run as root)'
1477 @echo ' Build, install, and boot kernel before'
1478 @echo ' running kselftest on it'
1479 @echo ' kselftest-clean - Remove all generated kselftest files'
1480 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1481 @echo ' .config.'
1482 @echo ''
1483 @$(if $(dtstree), \
1484 echo 'Devicetree:'; \
1485 echo '* dtbs - Build device tree blobs for enabled boards'; \
1486 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1487 echo '')
1488
1489 @echo 'Userspace tools targets:'
1490 @echo ' use "make tools/help"'
1491 @echo ' or "cd tools; make help"'
1492 @echo ''
1493 @echo 'Kernel packaging:'
1494 @$(MAKE) $(build)=$(package-dir) help
1495 @echo ''
1496 @echo 'Documentation targets:'
1497 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1498 @echo ''
1499 @echo 'Architecture specific targets ($(SRCARCH)):'
1500 @$(if $(archhelp),$(archhelp),\
1501 echo ' No architecture specific help defined for $(SRCARCH)')
1502 @echo ''
1503 @$(if $(boards), \
1504 $(foreach b, $(boards), \
1505 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1506 echo '')
1507 @$(if $(board-dirs), \
1508 $(foreach b, $(board-dirs), \
1509 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1510 printf " %-16s - Show all of the above\\n" help-boards; \
1511 echo '')
1512
1513 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1514 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1515 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1516 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1517 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1518 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1519 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1520 @echo ' 1: warnings which may be relevant and do not occur too often'
1521 @echo ' 2: warnings which occur quite often but may still be relevant'
1522 @echo ' 3: more obscure warnings, can most likely be ignored'
1523 @echo ' Multiple levels can be combined with W=12 or W=123'
1524 @echo ''
1525 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1526 @echo 'For further info see the ./README file'
1527
1528
1529 help-board-dirs := $(addprefix help-,$(board-dirs))
1530
1531 help-boards: $(help-board-dirs)
1532
1533 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1534
1535 $(help-board-dirs): help-%:
1536 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1537 @$(if $(boards-per-dir), \
1538 $(foreach b, $(boards-per-dir), \
1539 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1540 echo '')
1541
1542
1543 # Documentation targets
1544 # ---------------------------------------------------------------------------
1545 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1546 linkcheckdocs dochelp refcheckdocs
1547 PHONY += $(DOC_TARGETS)
1548 $(DOC_TARGETS): scripts_basic FORCE
1549 $(Q)$(MAKE) $(build)=Documentation $@
1550
1551 # Misc
1552 # ---------------------------------------------------------------------------
1553
1554 PHONY += scripts_gdb
1555 scripts_gdb: prepare
1556 $(Q)$(MAKE) $(build)=scripts/gdb
1557 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1558
1559 ifdef CONFIG_GDB_SCRIPTS
1560 all: scripts_gdb
1561 endif
1562
1563 else # KBUILD_EXTMOD
1564
1565 ###
1566 # External module support.
1567 # When building external modules the kernel used as basis is considered
1568 # read-only, and no consistency checks are made and the make
1569 # system is not used on the basis kernel. If updates are required
1570 # in the basis kernel ordinary make commands (without M=...) must
1571 # be used.
1572 #
1573 # The following are the only valid targets when building external
1574 # modules.
1575 # make M=dir clean Delete all automatically generated files
1576 # make M=dir modules Make all modules in specified dir
1577 # make M=dir Same as 'make M=dir modules'
1578 # make M=dir modules_install
1579 # Install the modules built in the module directory
1580 # Assumes install directory is already created
1581
1582 # We are always building modules
1583 KBUILD_MODULES := 1
1584
1585 PHONY += $(objtree)/Module.symvers
1586 $(objtree)/Module.symvers:
1587 @test -e $(objtree)/Module.symvers || ( \
1588 echo; \
1589 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1590 echo " is missing; modules will have no dependencies and modversions."; \
1591 echo )
1592
1593 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1594 PHONY += $(module-dirs) modules
1595 $(module-dirs): prepare $(objtree)/Module.symvers
1596 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1597
1598 modules: $(module-dirs)
1599 @$(kecho) ' Building modules, stage 2.';
1600 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1601
1602 PHONY += modules_install
1603 modules_install: _emodinst_ _emodinst_post
1604
1605 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1606 PHONY += _emodinst_
1607 _emodinst_:
1608 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1609 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1610
1611 PHONY += _emodinst_post
1612 _emodinst_post: _emodinst_
1613 $(call cmd,depmod)
1614
1615 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1616
1617 PHONY += $(clean-dirs) clean
1618 $(clean-dirs):
1619 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1620
1621 clean: rm-dirs := $(MODVERDIR)
1622 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1623
1624 PHONY += help
1625 help:
1626 @echo ' Building external modules.'
1627 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1628 @echo ''
1629 @echo ' modules - default target, build the module(s)'
1630 @echo ' modules_install - install the module'
1631 @echo ' clean - remove generated files in module directory only'
1632 @echo ''
1633
1634 PHONY += prepare
1635 prepare:
1636 $(cmd_crmodverdir)
1637 endif # KBUILD_EXTMOD
1638
1639 clean: $(clean-dirs)
1640 $(call cmd,rmdirs)
1641 $(call cmd,rmfiles)
1642 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1643 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1644 -o -name '*.ko.*' \
1645 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1646 -o -name '*.dwo' -o -name '*.lst' \
1647 -o -name '*.su' \
1648 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1649 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1650 -o -name '*.asn1.[ch]' \
1651 -o -name '*.symtypes' -o -name 'modules.order' \
1652 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1653 -o -name '*.c.[012]*.*' \
1654 -o -name '*.ll' \
1655 -o -name '*.gcno' \) -type f -print | xargs rm -f
1656
1657 # Generate tags for editors
1658 # ---------------------------------------------------------------------------
1659 quiet_cmd_tags = GEN $@
1660 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1661
1662 tags TAGS cscope gtags: FORCE
1663 $(call cmd,tags)
1664
1665 # Scripts to check various things for consistency
1666 # ---------------------------------------------------------------------------
1667
1668 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1669
1670 includecheck:
1671 find $(srctree)/* $(RCS_FIND_IGNORE) \
1672 -name '*.[hcS]' -type f -print | sort \
1673 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1674
1675 versioncheck:
1676 find $(srctree)/* $(RCS_FIND_IGNORE) \
1677 -name '*.[hcS]' -type f -print | sort \
1678 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1679
1680 coccicheck:
1681 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1682
1683 namespacecheck:
1684 $(PERL) $(srctree)/scripts/namespace.pl
1685
1686 export_report:
1687 $(PERL) $(srctree)/scripts/export_report.pl
1688
1689 PHONY += checkstack kernelrelease kernelversion image_name
1690
1691 # UML needs a little special treatment here. It wants to use the host
1692 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1693 # else wants $(ARCH), including people doing cross-builds, which means
1694 # that $(SUBARCH) doesn't work here.
1695 ifeq ($(ARCH), um)
1696 CHECKSTACK_ARCH := $(SUBARCH)
1697 else
1698 CHECKSTACK_ARCH := $(ARCH)
1699 endif
1700 checkstack:
1701 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1702 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1703
1704 kernelrelease:
1705 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1706
1707 kernelversion:
1708 @echo $(KERNELVERSION)
1709
1710 image_name:
1711 @echo $(KBUILD_IMAGE)
1712
1713 # Clear a bunch of variables before executing the submake
1714
1715 ifeq ($(quiet),silent_)
1716 tools_silent=s
1717 endif
1718
1719 tools/: FORCE
1720 $(Q)mkdir -p $(objtree)/tools
1721 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1722
1723 tools/%: FORCE
1724 $(Q)mkdir -p $(objtree)/tools
1725 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1726
1727 # Single targets
1728 # ---------------------------------------------------------------------------
1729 # Single targets are compatible with:
1730 # - build with mixed source and output
1731 # - build with separate output dir 'make O=...'
1732 # - external modules
1733 #
1734 # target-dir => where to store outputfile
1735 # build-dir => directory in kernel source tree to use
1736
1737 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1738 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1739
1740 %.i: prepare FORCE
1741 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1742 %.ll: prepare FORCE
1743 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1744 %.lst: prepare FORCE
1745 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1746 %.o: prepare FORCE
1747 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1748 %.s: prepare FORCE
1749 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1750 %.symtypes: prepare FORCE
1751 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1752 %.ko: %.o
1753 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1754
1755 # Modules
1756 PHONY += /
1757 /: ./
1758
1759 # Make sure the latest headers are built for Documentation
1760 Documentation/ samples/: headers_install
1761 %/: prepare FORCE
1762 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1763
1764 # FIXME Should go into a make.lib or something
1765 # ===========================================================================
1766
1767 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1768 cmd_rmdirs = rm -rf $(rm-dirs)
1769
1770 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1771 cmd_rmfiles = rm -f $(rm-files)
1772
1773 # Run depmod only if we have System.map and depmod is executable
1774 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1775 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1776 $(KERNELRELEASE)
1777
1778 # Create temporary dir for module support files
1779 # clean it up only when building all modules
1780 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1781 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1782
1783 # read saved command lines for existing targets
1784 existing-targets := $(wildcard $(sort $(targets)))
1785
1786 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1787
1788 endif # ifeq ($(config-targets),1)
1789 endif # ifeq ($(mixed-targets),1)
1790 endif # need-sub-make
1791
1792 PHONY += FORCE
1793 FORCE:
1794
1795 # Declare the contents of the PHONY variable as phony. We keep that
1796 # information in a variable so we can use it in if_changed and friends.
1797 .PHONY: $(PHONY)