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arm64: mm: Map entry trampoline into trampoline and kernel page tables
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1 VERSION = 4
2 PATCHLEVEL = 13
3 SUBLEVEL = 13
4 EXTRAVERSION =
5 NAME = Fearless Coyote
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 ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
88 quiet=silent_
89 tools_silent=s
90 endif
91
92 export quiet Q KBUILD_VERBOSE
93
94 # kbuild supports saving output files in a separate directory.
95 # To locate output files in a separate directory two syntaxes are supported.
96 # In both cases the working directory must be the root of the kernel src.
97 # 1) O=
98 # Use "make O=dir/to/store/output/files/"
99 #
100 # 2) Set KBUILD_OUTPUT
101 # Set the environment variable KBUILD_OUTPUT to point to the directory
102 # where the output files shall be placed.
103 # export KBUILD_OUTPUT=dir/to/store/output/files/
104 # make
105 #
106 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
107 # variable.
108
109 # KBUILD_SRC is not intended to be used by the regular user (for now),
110 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
111 ifeq ($(KBUILD_SRC),)
112
113 # OK, Make called in directory where kernel src resides
114 # Do we want to locate output files in a separate directory?
115 ifeq ("$(origin O)", "command line")
116 KBUILD_OUTPUT := $(O)
117 endif
118
119 # That's our default target when none is given on the command line
120 PHONY := _all
121 _all:
122
123 # Cancel implicit rules on top Makefile
124 $(CURDIR)/Makefile Makefile: ;
125
126 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
127 $(error main directory cannot contain spaces nor colons)
128 endif
129
130 ifneq ($(KBUILD_OUTPUT),)
131 # check that the output directory actually exists
132 saved-output := $(KBUILD_OUTPUT)
133 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
134 && /bin/pwd)
135 $(if $(KBUILD_OUTPUT),, \
136 $(error failed to create output directory "$(saved-output)"))
137
138 PHONY += $(MAKECMDGOALS) sub-make
139
140 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
141 @:
142
143 # Invoke a second make in the output directory, passing relevant variables
144 sub-make:
145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
147
148 # Leave processing to above invocation of make
149 skip-makefile := 1
150 endif # ifneq ($(KBUILD_OUTPUT),)
151 endif # ifeq ($(KBUILD_SRC),)
152
153 # We process the rest of the Makefile if this is the final invocation of make
154 ifeq ($(skip-makefile),)
155
156 # Do not print "Entering directory ...",
157 # but we want to display it when entering to the output directory
158 # so that IDEs/editors are able to understand relative filenames.
159 MAKEFLAGS += --no-print-directory
160
161 # Call a source code checker (by default, "sparse") as part of the
162 # C compilation.
163 #
164 # Use 'make C=1' to enable checking of only re-compiled files.
165 # Use 'make C=2' to enable checking of *all* source files, regardless
166 # of whether they are re-compiled or not.
167 #
168 # See the file "Documentation/dev-tools/sparse.rst" for more details,
169 # including where to get the "sparse" utility.
170
171 ifeq ("$(origin C)", "command line")
172 KBUILD_CHECKSRC = $(C)
173 endif
174 ifndef KBUILD_CHECKSRC
175 KBUILD_CHECKSRC = 0
176 endif
177
178 # Call message checker as part of the C compilation
179 #
180 # Use 'make D=1' to enable checking
181 # Use 'make D=2' to create the message catalog
182
183 ifdef D
184 ifeq ("$(origin D)", "command line")
185 KBUILD_KMSG_CHECK = $(D)
186 endif
187 endif
188 ifndef KBUILD_KMSG_CHECK
189 KBUILD_KMSG_CHECK = 0
190 endif
191
192 # Use make M=dir to specify directory of external module to build
193 # Old syntax make ... SUBDIRS=$PWD is still supported
194 # Setting the environment variable KBUILD_EXTMOD take precedence
195 ifdef SUBDIRS
196 KBUILD_EXTMOD ?= $(SUBDIRS)
197 endif
198
199 ifeq ("$(origin M)", "command line")
200 KBUILD_EXTMOD := $(M)
201 endif
202
203 # If building an external module we do not care about the all: rule
204 # but instead _all depend on modules
205 PHONY += all
206 ifeq ($(KBUILD_EXTMOD),)
207 _all: all
208 else
209 _all: modules
210 endif
211
212 ifeq ($(KBUILD_SRC),)
213 # building in the source tree
214 srctree := .
215 else
216 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
217 # building in a subdirectory of the source tree
218 srctree := ..
219 else
220 srctree := $(KBUILD_SRC)
221 endif
222 endif
223 objtree := .
224 src := $(srctree)
225 obj := $(objtree)
226
227 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
228
229 export srctree objtree VPATH
230
231 # SUBARCH tells the usermode build what the underlying arch is. That is set
232 # first, and if a usermode build is happening, the "ARCH=um" on the command
233 # line overrides the setting of ARCH below. If a native build is happening,
234 # then ARCH is assigned, getting whatever value it gets normally, and
235 # SUBARCH is subsequently ignored.
236
237 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
238 -e s/sun4u/sparc64/ \
239 -e s/arm.*/arm/ -e s/sa110/arm/ \
240 -e s/s390x/s390/ -e s/parisc64/parisc/ \
241 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
242 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
243
244 # Cross compiling and selecting different set of gcc/bin-utils
245 # ---------------------------------------------------------------------------
246 #
247 # When performing cross compilation for other architectures ARCH shall be set
248 # to the target architecture. (See arch/* for the possibilities).
249 # ARCH can be set during invocation of make:
250 # make ARCH=ia64
251 # Another way is to have ARCH set in the environment.
252 # The default ARCH is the host where make is executed.
253
254 # CROSS_COMPILE specify the prefix used for all executables used
255 # during compilation. Only gcc and related bin-utils executables
256 # are prefixed with $(CROSS_COMPILE).
257 # CROSS_COMPILE can be set on the command line
258 # make CROSS_COMPILE=ia64-linux-
259 # Alternatively CROSS_COMPILE can be set in the environment.
260 # A third alternative is to store a setting in .config so that plain
261 # "make" in the configured kernel build directory always uses that.
262 # Default value for CROSS_COMPILE is not to prefix executables
263 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
264 ARCH ?= $(SUBARCH)
265 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
266
267 # Architecture as present in compile.h
268 UTS_MACHINE := $(ARCH)
269 SRCARCH := $(ARCH)
270
271 # Additional ARCH settings for x86
272 ifeq ($(ARCH),i386)
273 SRCARCH := x86
274 endif
275 ifeq ($(ARCH),x86_64)
276 SRCARCH := x86
277 endif
278
279 # Additional ARCH settings for sparc
280 ifeq ($(ARCH),sparc32)
281 SRCARCH := sparc
282 endif
283 ifeq ($(ARCH),sparc64)
284 SRCARCH := sparc
285 endif
286
287 # Additional ARCH settings for sh
288 ifeq ($(ARCH),sh64)
289 SRCARCH := sh
290 endif
291
292 # Additional ARCH settings for tile
293 ifeq ($(ARCH),tilepro)
294 SRCARCH := tile
295 endif
296 ifeq ($(ARCH),tilegx)
297 SRCARCH := tile
298 endif
299
300 # Where to locate arch specific headers
301 hdr-arch := $(SRCARCH)
302
303 KCONFIG_CONFIG ?= .config
304 export KCONFIG_CONFIG
305
306 # SHELL used by kbuild
307 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
308 else if [ -x /bin/bash ]; then echo /bin/bash; \
309 else echo sh; fi ; fi)
310
311 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
312 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
313 HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
314
315 HOSTCC = gcc
316 HOSTCXX = g++
317 HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
318 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
319 HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
320 HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
321 HOST_LOADLIBES := $(HOST_LFS_LIBS)
322
323 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
324 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
325 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
326 endif
327
328 # Decide whether to build built-in, modular, or both.
329 # Normally, just do built-in.
330
331 KBUILD_MODULES :=
332 KBUILD_BUILTIN := 1
333
334 # If we have only "make modules", don't compile built-in objects.
335 # When we're building modules with modversions, we need to consider
336 # the built-in objects during the descend as well, in order to
337 # make sure the checksums are up to date before we record them.
338
339 ifeq ($(MAKECMDGOALS),modules)
340 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
341 endif
342
343 # If we have "make <whatever> modules", compile modules
344 # in addition to whatever we do anyway.
345 # Just "make" or "make all" shall build modules as well
346
347 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
348 KBUILD_MODULES := 1
349 endif
350
351 ifeq ($(MAKECMDGOALS),)
352 KBUILD_MODULES := 1
353 endif
354
355 export KBUILD_MODULES KBUILD_BUILTIN
356 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
357
358 # We need some generic definitions (do not try to remake the file).
359 scripts/Kbuild.include: ;
360 include scripts/Kbuild.include
361
362 # Make variables (CC, etc...)
363 AS = $(CROSS_COMPILE)as
364 LD = $(CROSS_COMPILE)ld
365 CC = $(CROSS_COMPILE)gcc
366 CPP = $(CC) -E
367 AR = $(CROSS_COMPILE)ar
368 NM = $(CROSS_COMPILE)nm
369 STRIP = $(CROSS_COMPILE)strip
370 OBJCOPY = $(CROSS_COMPILE)objcopy
371 OBJDUMP = $(CROSS_COMPILE)objdump
372 AWK = awk
373 GENKSYMS = scripts/genksyms/genksyms
374 INSTALLKERNEL := installkernel
375 DEPMOD = /sbin/depmod
376 PERL = perl
377 PYTHON = python
378 CHECK = sparse
379
380 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
381 -Wbitwise -Wno-return-void $(CF)
382 KMSG_CHECK = $(srctree)/scripts/kmsg-doc
383 NOSTDINC_FLAGS =
384 CFLAGS_MODULE =
385 AFLAGS_MODULE =
386 LDFLAGS_MODULE =
387 CFLAGS_KERNEL =
388 AFLAGS_KERNEL =
389 LDFLAGS_vmlinux =
390 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
391 CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
392
393 # Prefer linux-backports-modules
394 ifneq ($(KBUILD_SRC),)
395 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
396 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
397 endif
398 endif
399
400 # Use USERINCLUDE when you must reference the UAPI directories only.
401 USERINCLUDE := \
402 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
403 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
404 -I$(srctree)/include/uapi \
405 -I$(objtree)/include/generated/uapi \
406 -include $(srctree)/include/linux/kconfig.h
407
408 # Use LINUXINCLUDE when you must reference the include/ directory.
409 # Needed to be compatible with the O= option
410 LINUXINCLUDE := \
411 $(UBUNTUINCLUDE) \
412 -I$(srctree)/arch/$(hdr-arch)/include \
413 -I$(objtree)/arch/$(hdr-arch)/include/generated \
414 $(if $(KBUILD_SRC), -I$(srctree)/include) \
415 -I$(objtree)/include \
416 $(USERINCLUDE)
417
418 # UBUNTU: Include our third party driver stuff too
419 LINUXINCLUDE += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
420
421 KBUILD_CPPFLAGS := -D__KERNEL__
422
423 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
424 -fno-strict-aliasing -fno-common -fshort-wchar \
425 -Werror-implicit-function-declaration \
426 -Wno-format-security \
427 -std=gnu89 $(call cc-option,-fno-PIE)
428
429
430 KBUILD_AFLAGS_KERNEL :=
431 KBUILD_CFLAGS_KERNEL :=
432 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
433 KBUILD_AFLAGS_MODULE := -DMODULE
434 KBUILD_CFLAGS_MODULE := -DMODULE
435 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
436
437 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
438 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
439 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
440
441 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
442 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
443 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
444 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
445 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
446
447 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
448 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
449 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
450 export KBUILD_KMSG_CHECK KMSG_CHECK
451 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
452 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
453 export KBUILD_ARFLAGS
454
455 # When compiling out-of-tree modules, put MODVERDIR in the module
456 # tree rather than in the kernel tree. The kernel tree might
457 # even be read-only.
458 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
459
460 # Files to ignore in find ... statements
461
462 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
463 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
464 -prune -o
465 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
466 --exclude CVS --exclude .pc --exclude .hg --exclude .git
467
468 # ===========================================================================
469 # Rules shared between *config targets and build targets
470
471 # Basic helpers built in scripts/basic/
472 PHONY += scripts_basic
473 scripts_basic:
474 $(Q)$(MAKE) $(build)=scripts/basic
475 $(Q)rm -f .tmp_quiet_recordmcount
476
477 # To avoid any implicit rule to kick in, define an empty command.
478 scripts/basic/%: scripts_basic ;
479
480 PHONY += outputmakefile
481 # outputmakefile generates a Makefile in the output directory, if using a
482 # separate output directory. This allows convenient use of make in the
483 # output directory.
484 outputmakefile:
485 ifneq ($(KBUILD_SRC),)
486 $(Q)ln -fsn $(srctree) source
487 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
488 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
489 endif
490
491 # Support for using generic headers in asm-generic
492 PHONY += asm-generic uapi-asm-generic
493 asm-generic: uapi-asm-generic
494 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
495 src=asm obj=arch/$(SRCARCH)/include/generated/asm
496 uapi-asm-generic:
497 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
498 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
499
500 # To make sure we do not include .config for any of the *config targets
501 # catch them early, and hand them over to scripts/kconfig/Makefile
502 # It is allowed to specify more targets when calling make, including
503 # mixing *config targets and build targets.
504 # For example 'make oldconfig all'.
505 # Detect when mixed targets is specified, and make a second invocation
506 # of make so .config is not included in this case either (for *config).
507
508 version_h := include/generated/uapi/linux/version.h
509 old_version_h := include/linux/version.h
510
511 no-dot-config-targets := clean mrproper distclean \
512 cscope gtags TAGS tags help% %docs check% coccicheck \
513 $(version_h) headers_% archheaders archscripts \
514 kernelversion %src-pkg
515
516 config-targets := 0
517 mixed-targets := 0
518 dot-config := 1
519
520 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
521 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
522 dot-config := 0
523 endif
524 endif
525
526 ifeq ($(KBUILD_EXTMOD),)
527 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
528 config-targets := 1
529 ifneq ($(words $(MAKECMDGOALS)),1)
530 mixed-targets := 1
531 endif
532 endif
533 endif
534 # install and modules_install need also be processed one by one
535 ifneq ($(filter install,$(MAKECMDGOALS)),)
536 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
537 mixed-targets := 1
538 endif
539 endif
540
541 ifeq ($(mixed-targets),1)
542 # ===========================================================================
543 # We're called with mixed targets (*config and build targets).
544 # Handle them one by one.
545
546 PHONY += $(MAKECMDGOALS) __build_one_by_one
547
548 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
549 @:
550
551 __build_one_by_one:
552 $(Q)set -e; \
553 for i in $(MAKECMDGOALS); do \
554 $(MAKE) -f $(srctree)/Makefile $$i; \
555 done
556
557 else
558 ifeq ($(config-targets),1)
559 # ===========================================================================
560 # *config targets only - make sure prerequisites are updated, and descend
561 # in scripts/kconfig to make the *config target
562
563 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
564 # KBUILD_DEFCONFIG may point out an alternative default configuration
565 # used for 'make defconfig'
566 include arch/$(SRCARCH)/Makefile
567 export KBUILD_DEFCONFIG KBUILD_KCONFIG
568
569 config: scripts_basic outputmakefile FORCE
570 $(Q)$(MAKE) $(build)=scripts/kconfig $@
571
572 %config: scripts_basic outputmakefile FORCE
573 $(Q)$(MAKE) $(build)=scripts/kconfig $@
574
575 else
576 # ===========================================================================
577 # Build targets only - this includes vmlinux, arch specific targets, clean
578 # targets and others. In general all targets except *config targets.
579
580 ifeq ($(KBUILD_EXTMOD),)
581 # Additional helpers built in scripts/
582 # Carefully list dependencies so we do not try to build scripts twice
583 # in parallel
584 PHONY += scripts
585 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
586 asm-generic gcc-plugins
587 $(Q)$(MAKE) $(build)=$(@)
588
589 # Objects we will link into vmlinux / subdirs we need to visit
590 init-y := init/
591 drivers-y := drivers/ sound/ firmware/ ubuntu/
592 net-y := net/
593 libs-y := lib/
594 core-y := usr/
595 virt-y := virt/
596 endif # KBUILD_EXTMOD
597
598 ifeq ($(dot-config),1)
599 # Read in config
600 -include include/config/auto.conf
601
602 ifeq ($(KBUILD_EXTMOD),)
603 # Read in dependencies to all Kconfig* files, make sure to run
604 # oldconfig if changes are detected.
605 -include include/config/auto.conf.cmd
606
607 # To avoid any implicit rule to kick in, define an empty command
608 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
609
610 # If .config is newer than include/config/auto.conf, someone tinkered
611 # with it and forgot to run make oldconfig.
612 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
613 # we execute the config step to be sure to catch updated Kconfig files
614 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
615 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
616 else
617 # external modules needs include/generated/autoconf.h and include/config/auto.conf
618 # but do not care if they are up-to-date. Use auto.conf to trigger the test
619 PHONY += include/config/auto.conf
620
621 include/config/auto.conf:
622 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
623 echo >&2; \
624 echo >&2 " ERROR: Kernel configuration is invalid."; \
625 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
626 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
627 echo >&2 ; \
628 /bin/false)
629
630 endif # KBUILD_EXTMOD
631
632 else
633 # Dummy target needed, because used as prerequisite
634 include/config/auto.conf: ;
635 endif # $(dot-config)
636
637 # For the kernel to actually contain only the needed exported symbols,
638 # we have to build modules as well to determine what those symbols are.
639 # (this can be evaluated only once include/config/auto.conf has been included)
640 ifdef CONFIG_TRIM_UNUSED_KSYMS
641 KBUILD_MODULES := 1
642 endif
643
644 # The all: target is the default when no target is given on the
645 # command line.
646 # This allow a user to issue only 'make' to build a kernel including modules
647 # Defaults to vmlinux, but the arch makefile usually adds further targets
648 all: vmlinux
649
650 # force no-pie for distro compilers that enable pie by default
651 KBUILD_CFLAGS += $(call cc-option, -fno-pie)
652 KBUILD_CFLAGS += $(call cc-option, -no-pie)
653 KBUILD_AFLAGS += $(call cc-option, -fno-pie)
654 KBUILD_CPPFLAGS += $(call cc-option, -fno-pie)
655
656 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
657 # values of the respective KBUILD_* variables
658 ARCH_CPPFLAGS :=
659 ARCH_AFLAGS :=
660 ARCH_CFLAGS :=
661 include arch/$(SRCARCH)/Makefile
662
663 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
664 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
665 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
666 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
667 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
668
669 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
670 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
671 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
672 else
673 ifdef CONFIG_PROFILE_ALL_BRANCHES
674 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
675 else
676 KBUILD_CFLAGS += -O2
677 endif
678 endif
679
680 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
681 $(call cc-disable-warning,maybe-uninitialized,))
682
683 # Tell gcc to never replace conditional load with a non-conditional one
684 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
685
686 # check for 'asm goto'
687 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
688 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
689 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
690 endif
691
692 include scripts/Makefile.gcc-plugins
693
694 ifdef CONFIG_READABLE_ASM
695 # Disable optimizations that make assembler listings hard to read.
696 # reorder blocks reorders the control in the function
697 # ipa clone creates specialized cloned functions
698 # partial inlining inlines only parts of functions
699 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
700 $(call cc-option,-fno-ipa-cp-clone,) \
701 $(call cc-option,-fno-partial-inlining)
702 endif
703
704 ifneq ($(CONFIG_FRAME_WARN),0)
705 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
706 endif
707
708 # This selects the stack protector compiler flag. Testing it is delayed
709 # until after .config has been reprocessed, in the prepare-compiler-check
710 # target.
711 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
712 stackp-flag := -fstack-protector
713 stackp-name := REGULAR
714 else
715 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
716 stackp-flag := -fstack-protector-strong
717 stackp-name := STRONG
718 else
719 # Force off for distro compilers that enable stack protector by default.
720 stackp-flag := $(call cc-option, -fno-stack-protector)
721 endif
722 endif
723 # Find arch-specific stack protector compiler sanity-checking script.
724 ifdef CONFIG_CC_STACKPROTECTOR
725 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
726 stackp-check := $(wildcard $(stackp-path))
727 endif
728 KBUILD_CFLAGS += $(stackp-flag)
729
730 ifeq ($(cc-name),clang)
731 ifneq ($(CROSS_COMPILE),)
732 CLANG_TARGET := -target $(notdir $(CROSS_COMPILE:%-=%))
733 GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
734 endif
735 ifneq ($(GCC_TOOLCHAIN),)
736 CLANG_GCC_TC := -gcc-toolchain $(GCC_TOOLCHAIN)
737 endif
738 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
739 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
740 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
741 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
742 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
743 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
744 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
745 # Quiet clang warning: comparison of unsigned expression < 0 is always false
746 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
747 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
748 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
749 # See modpost pattern 2
750 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
751 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
752 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
753 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
754 else
755
756 # These warnings generated too much noise in a regular build.
757 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
758 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
759 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
760 endif
761
762 ifdef CONFIG_FRAME_POINTER
763 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
764 else
765 # Some targets (ARM with Thumb2, for example), can't be built with frame
766 # pointers. For those, we don't have FUNCTION_TRACER automatically
767 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
768 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
769 # -fomit-frame-pointer with FUNCTION_TRACER.
770 ifndef CONFIG_FUNCTION_TRACER
771 KBUILD_CFLAGS += -fomit-frame-pointer
772 endif
773 endif
774
775 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
776
777 ifdef CONFIG_DEBUG_INFO
778 ifdef CONFIG_DEBUG_INFO_SPLIT
779 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
780 else
781 KBUILD_CFLAGS += -g
782 endif
783 KBUILD_AFLAGS += -Wa,-gdwarf-2
784 endif
785 ifdef CONFIG_DEBUG_INFO_DWARF4
786 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
787 endif
788
789 ifdef CONFIG_DEBUG_INFO_REDUCED
790 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
791 $(call cc-option,-fno-var-tracking)
792 endif
793
794 ifdef CONFIG_FUNCTION_TRACER
795 ifndef CC_FLAGS_FTRACE
796 CC_FLAGS_FTRACE := -pg
797 endif
798 export CC_FLAGS_FTRACE
799 ifdef CONFIG_HAVE_FENTRY
800 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
801 endif
802 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
803 KBUILD_AFLAGS += $(CC_USING_FENTRY)
804 ifdef CONFIG_DYNAMIC_FTRACE
805 ifdef CONFIG_HAVE_C_RECORDMCOUNT
806 BUILD_C_RECORDMCOUNT := y
807 export BUILD_C_RECORDMCOUNT
808 endif
809 endif
810 endif
811
812 # We trigger additional mismatches with less inlining
813 ifdef CONFIG_DEBUG_SECTION_MISMATCH
814 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
815 endif
816
817 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
818 KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
819 KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
820 endif
821
822 # arch Makefile may override CC so keep this after arch Makefile is included
823 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
824 CHECKFLAGS += $(NOSTDINC_FLAGS)
825
826 # warn about C99 declaration after statement
827 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
828
829 # disable pointer signed / unsigned warnings in gcc 4.0
830 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
831
832 # disable invalid "can't wrap" optimizations for signed / pointers
833 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
834
835 # conserve stack if available
836 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
837
838 # disallow errors like 'EXPORT_GPL(foo);' with missing header
839 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
840
841 # require functions to have arguments in prototypes, not empty 'int foo()'
842 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
843
844 # Prohibit date/time macros, which would make the build non-deterministic
845 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
846
847 # enforce correct pointer usage
848 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
849
850 # Require designated initializers for all marked structures
851 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
852
853 # use the deterministic mode of AR if available
854 KBUILD_ARFLAGS := $(call ar-option,D)
855
856 include scripts/Makefile.kasan
857 include scripts/Makefile.extrawarn
858 include scripts/Makefile.ubsan
859
860 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
861 # last assignments
862 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
863 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
864 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
865
866 # Use --build-id when available.
867 LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
868 $(call cc-ldoption, -Wl$(comma)--build-id,))
869 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
870 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
871
872 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
873 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
874 endif
875
876 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
877 LDFLAGS_vmlinux += $(call ld-option, -X,)
878 endif
879
880 # Default kernel image to build when no specific target is given.
881 # KBUILD_IMAGE may be overruled on the command line or
882 # set in the environment
883 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
884 # this default value
885 export KBUILD_IMAGE ?= vmlinux
886
887 #
888 # INSTALL_PATH specifies where to place the updated kernel and system map
889 # images. Default is /boot, but you can set it to other values
890 export INSTALL_PATH ?= /boot
891
892 #
893 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
894 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
895 # an argument if needed. Otherwise it defaults to the kernel install path
896 #
897 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
898
899 #
900 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
901 # relocations required by build roots. This is not defined in the
902 # makefile but the argument can be passed to make if needed.
903 #
904
905 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
906 export MODLIB
907
908 #
909 # INSTALL_MOD_STRIP, if defined, will cause modules to be
910 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
911 # the default option --strip-debug will be used. Otherwise,
912 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
913
914 ifdef INSTALL_MOD_STRIP
915 ifeq ($(INSTALL_MOD_STRIP),1)
916 mod_strip_cmd = $(STRIP) --strip-debug
917 else
918 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
919 endif # INSTALL_MOD_STRIP=1
920 else
921 mod_strip_cmd = true
922 endif # INSTALL_MOD_STRIP
923 export mod_strip_cmd
924
925 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
926 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
927 # or CONFIG_MODULE_COMPRESS_XZ.
928
929 mod_compress_cmd = true
930 ifdef CONFIG_MODULE_COMPRESS
931 ifdef CONFIG_MODULE_COMPRESS_GZIP
932 mod_compress_cmd = gzip -n -f
933 endif # CONFIG_MODULE_COMPRESS_GZIP
934 ifdef CONFIG_MODULE_COMPRESS_XZ
935 mod_compress_cmd = xz -f
936 endif # CONFIG_MODULE_COMPRESS_XZ
937 endif # CONFIG_MODULE_COMPRESS
938 export mod_compress_cmd
939
940 # Select initial ramdisk compression format, default is gzip(1).
941 # This shall be used by the dracut(8) tool while creating an initramfs image.
942 #
943 INITRD_COMPRESS-y := gzip
944 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
945 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
946 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
947 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
948 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
949 # do not export INITRD_COMPRESS, since we didn't actually
950 # choose a sane default compression above.
951 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
952
953 ifdef CONFIG_MODULE_SIG_ALL
954 $(eval $(call config_filename,MODULE_SIG_KEY))
955
956 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
957 else
958 mod_sign_cmd = true
959 endif
960 export mod_sign_cmd
961
962 ifdef CONFIG_STACK_VALIDATION
963 has_libelf := $(call try-run,\
964 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
965 ifeq ($(has_libelf),1)
966 objtool_target := tools/objtool FORCE
967 else
968 ifdef CONFIG_UNWINDER_ORC
969 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
970 else
971 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
972 endif
973 SKIP_STACK_VALIDATION := 1
974 export SKIP_STACK_VALIDATION
975 endif
976 endif
977
978
979 ifeq ($(KBUILD_EXTMOD),)
980 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
981
982 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
983 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
984 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
985
986 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
987 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
988
989 init-y := $(patsubst %/, %/built-in.o, $(init-y))
990 core-y := $(patsubst %/, %/built-in.o, $(core-y))
991 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
992 net-y := $(patsubst %/, %/built-in.o, $(net-y))
993 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
994 libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
995 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
996
997 # Externally visible symbols (used by link-vmlinux.sh)
998 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
999 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1000 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1001 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1002 export LDFLAGS_vmlinux
1003 # used by scripts/package/Makefile
1004 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1005
1006 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1007
1008 # Include targets which we want to execute sequentially if the rest of the
1009 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1010 # evaluated more than once.
1011 PHONY += vmlinux_prereq
1012 vmlinux_prereq: $(vmlinux-deps) FORCE
1013 ifdef CONFIG_HEADERS_CHECK
1014 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1015 endif
1016 ifdef CONFIG_GDB_SCRIPTS
1017 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1018 endif
1019 ifdef CONFIG_TRIM_UNUSED_KSYMS
1020 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1021 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1022 endif
1023
1024 # standalone target for easier testing
1025 include/generated/autoksyms.h: FORCE
1026 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1027
1028 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1029
1030 # Final link of vmlinux with optional arch pass after final link
1031 cmd_link-vmlinux = \
1032 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1033 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1034
1035 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1036 +$(call if_changed,link-vmlinux)
1037
1038 # Build samples along the rest of the kernel
1039 ifdef CONFIG_SAMPLES
1040 vmlinux-dirs += samples
1041 endif
1042
1043 # The actual objects are generated when descending,
1044 # make sure no implicit rule kicks in
1045 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1046
1047 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1048 # Preset locale variables to speed up the build process. Limit locale
1049 # tweaks to this spot to avoid wrong language settings when running
1050 # make menuconfig etc.
1051 # Error messages still appears in the original language
1052
1053 PHONY += $(vmlinux-dirs)
1054 $(vmlinux-dirs): prepare scripts
1055 $(Q)$(MAKE) $(build)=$@
1056
1057 define filechk_kernel.release
1058 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1059 endef
1060
1061 # Store (new) KERNELRELEASE string in include/config/kernel.release
1062 include/config/kernel.release: include/config/auto.conf FORCE
1063 $(call filechk,kernel.release)
1064
1065
1066 # Things we need to do before we recursively start building the kernel
1067 # or the modules are listed in "prepare".
1068 # A multi level approach is used. prepareN is processed before prepareN-1.
1069 # archprepare is used in arch Makefiles and when processed asm symlink,
1070 # version.h and scripts_basic is processed / created.
1071
1072 # Listed in dependency order
1073 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1074
1075 # prepare3 is used to check if we are building in a separate output directory,
1076 # and if so do:
1077 # 1) Check that make has not been executed in the kernel src $(srctree)
1078 prepare3: include/config/kernel.release
1079 ifneq ($(KBUILD_SRC),)
1080 @$(kecho) ' Using $(srctree) as source for kernel'
1081 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1082 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1083 echo >&2 " in the '$(srctree)' directory.";\
1084 /bin/false; \
1085 fi;
1086 endif
1087
1088 # prepare2 creates a makefile if using a separate output directory.
1089 # From this point forward, .config has been reprocessed, so any rules
1090 # that need to depend on updated CONFIG_* values can be checked here.
1091 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1092
1093 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1094 include/config/auto.conf
1095 $(cmd_crmodverdir)
1096
1097 archprepare: archheaders archscripts prepare1 scripts_basic
1098
1099 prepare0: archprepare gcc-plugins
1100 $(Q)$(MAKE) $(build)=.
1101
1102 # All the preparing..
1103 prepare: prepare0 prepare-objtool
1104
1105 PHONY += prepare-objtool
1106 prepare-objtool: $(objtool_target)
1107
1108 # Check for CONFIG flags that require compiler support. Abort the build
1109 # after .config has been processed, but before the kernel build starts.
1110 #
1111 # For security-sensitive CONFIG options, we don't want to fallback and/or
1112 # silently change which compiler flags will be used, since that leads to
1113 # producing kernels with different security feature characteristics
1114 # depending on the compiler used. (For example, "But I selected
1115 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1116 PHONY += prepare-compiler-check
1117 prepare-compiler-check: FORCE
1118 # Make sure compiler supports requested stack protector flag.
1119 ifdef stackp-name
1120 ifeq ($(call cc-option, $(stackp-flag)),)
1121 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1122 $(stackp-flag) not supported by compiler >&2 && exit 1
1123 endif
1124 endif
1125 # Make sure compiler does not have buggy stack-protector support.
1126 ifdef stackp-check
1127 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1128 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1129 $(stackp-flag) available but compiler is broken >&2 && exit 1
1130 endif
1131 endif
1132 @:
1133
1134 # Generate some files
1135 # ---------------------------------------------------------------------------
1136
1137 # KERNELRELEASE can change from a few different places, meaning version.h
1138 # needs to be updated, so this check is forced on all builds
1139
1140 uts_len := 64
1141 define filechk_utsrelease.h
1142 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1143 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1144 exit 1; \
1145 fi; \
1146 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1147 endef
1148
1149 define filechk_version.h
1150 (echo \#define LINUX_VERSION_CODE $(shell \
1151 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1152 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1153 endef
1154
1155 $(version_h): $(srctree)/Makefile FORCE
1156 $(call filechk,version.h)
1157 $(Q)rm -f $(old_version_h)
1158
1159 include/generated/utsrelease.h: include/config/kernel.release FORCE
1160 $(call filechk,utsrelease.h)
1161
1162 PHONY += headerdep
1163 headerdep:
1164 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1165 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1166
1167 # ---------------------------------------------------------------------------
1168 # Firmware install
1169 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1170 export INSTALL_FW_PATH
1171
1172 PHONY += firmware_install
1173 firmware_install:
1174 @mkdir -p $(objtree)/firmware
1175 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1176
1177 # ---------------------------------------------------------------------------
1178 # Kernel headers
1179
1180 #Default location for installed headers
1181 export INSTALL_HDR_PATH = $(objtree)/usr
1182
1183 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1184 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
1185
1186 PHONY += archheaders
1187 archheaders:
1188
1189 PHONY += archscripts
1190 archscripts:
1191
1192 PHONY += __headers
1193 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1194 $(Q)$(MAKE) $(build)=scripts build_unifdef
1195
1196 PHONY += headers_install_all
1197 headers_install_all:
1198 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1199
1200 PHONY += headers_install
1201 headers_install: __headers
1202 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1203 $(error Headers not exportable for the $(SRCARCH) architecture))
1204 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1205 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
1206 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1207
1208 PHONY += headers_check_all
1209 headers_check_all: headers_install_all
1210 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1211
1212 PHONY += headers_check
1213 headers_check: headers_install
1214 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1215 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
1216 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1217
1218 # ---------------------------------------------------------------------------
1219 # Kernel selftest
1220
1221 PHONY += kselftest
1222 kselftest:
1223 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1224
1225 PHONY += kselftest-clean
1226 kselftest-clean:
1227 $(Q)$(MAKE) -C tools/testing/selftests clean
1228
1229 PHONY += kselftest-merge
1230 kselftest-merge:
1231 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1232 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1233 -m $(objtree)/.config \
1234 $(srctree)/tools/testing/selftests/*/config
1235 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1236
1237 # ---------------------------------------------------------------------------
1238 # Modules
1239
1240 ifdef CONFIG_MODULES
1241
1242 # By default, build modules as well
1243
1244 all: modules
1245
1246 # Build modules
1247 #
1248 # A module can be listed more than once in obj-m resulting in
1249 # duplicate lines in modules.order files. Those are removed
1250 # using awk while concatenating to the final file.
1251
1252 PHONY += modules
1253 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1254 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1255 @$(kecho) ' Building modules, stage 2.';
1256 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1257 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1258
1259 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1260 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1261
1262 %/modules.builtin: include/config/auto.conf
1263 $(Q)$(MAKE) $(modbuiltin)=$*
1264
1265
1266 # Target to prepare building external modules
1267 PHONY += modules_prepare
1268 modules_prepare: prepare scripts
1269
1270 # Target to install modules
1271 PHONY += modules_install
1272 modules_install: _modinst_ _modinst_post
1273
1274 PHONY += _modinst_
1275 _modinst_:
1276 @rm -rf $(MODLIB)/kernel
1277 @rm -f $(MODLIB)/source
1278 @mkdir -p $(MODLIB)/kernel
1279 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1280 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1281 rm -f $(MODLIB)/build ; \
1282 ln -s $(CURDIR) $(MODLIB)/build ; \
1283 fi
1284 @cp -f $(objtree)/modules.order $(MODLIB)/
1285 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1286 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1287
1288 # This depmod is only for convenience to give the initial
1289 # boot a modules.dep even before / is mounted read-write. However the
1290 # boot script depmod is the master version.
1291 PHONY += _modinst_post
1292 _modinst_post: _modinst_
1293 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1294 $(call cmd,depmod)
1295
1296 ifeq ($(CONFIG_MODULE_SIG), y)
1297 PHONY += modules_sign
1298 modules_sign:
1299 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1300 endif
1301
1302 else # CONFIG_MODULES
1303
1304 # Modules not configured
1305 # ---------------------------------------------------------------------------
1306
1307 PHONY += modules modules_install
1308 modules modules_install:
1309 @echo >&2
1310 @echo >&2 "The present kernel configuration has modules disabled."
1311 @echo >&2 "Type 'make config' and enable loadable module support."
1312 @echo >&2 "Then build a kernel with module support enabled."
1313 @echo >&2
1314 @exit 1
1315
1316 endif # CONFIG_MODULES
1317
1318 ###
1319 # Cleaning is done on three levels.
1320 # make clean Delete most generated files
1321 # Leave enough to build external modules
1322 # make mrproper Delete the current configuration, and all generated files
1323 # make distclean Remove editor backup files, patch leftover files and the like
1324
1325 # Directories & files removed with 'make clean'
1326 CLEAN_DIRS += $(MODVERDIR)
1327
1328 # Directories & files removed with 'make mrproper'
1329 MRPROPER_DIRS += include/config usr/include include/generated \
1330 arch/*/include/generated .tmp_objdiff
1331 MRPROPER_FILES += .config .config.old .version .old_version \
1332 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1333 signing_key.pem signing_key.priv signing_key.x509 \
1334 x509.genkey extra_certificates signing_key.x509.keyid \
1335 signing_key.x509.signer vmlinux-gdb.py
1336
1337 # clean - Delete most, but leave enough to build external modules
1338 #
1339 clean: rm-dirs := $(CLEAN_DIRS)
1340 clean: rm-files := $(CLEAN_FILES)
1341 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1342
1343 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1344 $(clean-dirs):
1345 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1346
1347 vmlinuxclean:
1348 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1349 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1350
1351 clean: archclean vmlinuxclean
1352
1353 # mrproper - Delete all generated files, including .config
1354 #
1355 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1356 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1357 mrproper-dirs := $(addprefix _mrproper_,scripts)
1358
1359 PHONY += $(mrproper-dirs) mrproper archmrproper
1360 $(mrproper-dirs):
1361 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1362
1363 mrproper: clean archmrproper $(mrproper-dirs)
1364 $(call cmd,rmdirs)
1365 $(call cmd,rmfiles)
1366
1367 # distclean
1368 #
1369 PHONY += distclean
1370
1371 distclean: mrproper
1372 @find $(srctree) $(RCS_FIND_IGNORE) \
1373 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1374 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1375 -o -name 'core' \) \
1376 -type f -print | xargs rm -f
1377
1378
1379 # Packaging of the kernel to various formats
1380 # ---------------------------------------------------------------------------
1381 # rpm target kept for backward compatibility
1382 package-dir := scripts/package
1383
1384 %src-pkg: FORCE
1385 $(Q)$(MAKE) $(build)=$(package-dir) $@
1386 %pkg: include/config/kernel.release FORCE
1387 $(Q)$(MAKE) $(build)=$(package-dir) $@
1388 rpm: include/config/kernel.release FORCE
1389 $(Q)$(MAKE) $(build)=$(package-dir) $@
1390
1391
1392 # Brief documentation of the typical targets used
1393 # ---------------------------------------------------------------------------
1394
1395 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1396 boards := $(sort $(notdir $(boards)))
1397 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1398 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1399
1400 PHONY += help
1401 help:
1402 @echo 'Cleaning targets:'
1403 @echo ' clean - Remove most generated files but keep the config and'
1404 @echo ' enough build support to build external modules'
1405 @echo ' mrproper - Remove all generated files + config + various backup files'
1406 @echo ' distclean - mrproper + remove editor backup and patch files'
1407 @echo ''
1408 @echo 'Configuration targets:'
1409 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1410 @echo ''
1411 @echo 'Other generic targets:'
1412 @echo ' all - Build all targets marked with [*]'
1413 @echo '* vmlinux - Build the bare kernel'
1414 @echo '* modules - Build all modules'
1415 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1416 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1417 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1418 @echo ' dir/ - Build all files in dir and below'
1419 @echo ' dir/file.[ois] - Build specified target only'
1420 @echo ' dir/file.ll - Build the LLVM assembly file'
1421 @echo ' (requires compiler support for LLVM assembly generation)'
1422 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1423 @echo ' (requires a recent binutils and recent build (System.map))'
1424 @echo ' dir/file.ko - Build module including final link'
1425 @echo ' modules_prepare - Set up for building external modules'
1426 @echo ' tags/TAGS - Generate tags file for editors'
1427 @echo ' cscope - Generate cscope index'
1428 @echo ' gtags - Generate GNU GLOBAL index'
1429 @echo ' kernelrelease - Output the release version string (use with make -s)'
1430 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1431 @echo ' image_name - Output the image name (use with make -s)'
1432 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1433 echo ' (default: $(INSTALL_HDR_PATH))'; \
1434 echo ''
1435 @echo 'Static analysers:'
1436 @echo ' checkstack - Generate a list of stack hogs'
1437 @echo ' namespacecheck - Name space analysis on compiled kernel'
1438 @echo ' versioncheck - Sanity check on version.h usage'
1439 @echo ' includecheck - Check for duplicate included header files'
1440 @echo ' export_report - List the usages of all exported symbols'
1441 @echo ' headers_check - Sanity check on exported headers'
1442 @echo ' headerdep - Detect inclusion cycles in headers'
1443 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1444 @echo ''
1445 @echo 'Kernel selftest:'
1446 @echo ' kselftest - Build and run kernel selftest (run as root)'
1447 @echo ' Build, install, and boot kernel before'
1448 @echo ' running kselftest on it'
1449 @echo ' kselftest-clean - Remove all generated kselftest files'
1450 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1451 @echo ' .config.'
1452 @echo ''
1453 @echo 'Userspace tools targets:'
1454 @echo ' use "make tools/help"'
1455 @echo ' or "cd tools; make help"'
1456 @echo ''
1457 @echo 'Kernel packaging:'
1458 @$(MAKE) $(build)=$(package-dir) help
1459 @echo ''
1460 @echo 'Documentation targets:'
1461 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1462 @echo ''
1463 @echo 'Architecture specific targets ($(SRCARCH)):'
1464 @$(if $(archhelp),$(archhelp),\
1465 echo ' No architecture specific help defined for $(SRCARCH)')
1466 @echo ''
1467 @$(if $(boards), \
1468 $(foreach b, $(boards), \
1469 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1470 echo '')
1471 @$(if $(board-dirs), \
1472 $(foreach b, $(board-dirs), \
1473 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1474 printf " %-16s - Show all of the above\\n" help-boards; \
1475 echo '')
1476
1477 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1478 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1479 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1480 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1481 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1482 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1483 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1484 @echo ' 1: warnings which may be relevant and do not occur too often'
1485 @echo ' 2: warnings which occur quite often but may still be relevant'
1486 @echo ' 3: more obscure warnings, can most likely be ignored'
1487 @echo ' Multiple levels can be combined with W=12 or W=123'
1488 @echo ''
1489 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1490 @echo 'For further info see the ./README file'
1491
1492
1493 help-board-dirs := $(addprefix help-,$(board-dirs))
1494
1495 help-boards: $(help-board-dirs)
1496
1497 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1498
1499 $(help-board-dirs): help-%:
1500 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1501 @$(if $(boards-per-dir), \
1502 $(foreach b, $(boards-per-dir), \
1503 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1504 echo '')
1505
1506
1507 # Documentation targets
1508 # ---------------------------------------------------------------------------
1509 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs
1510 PHONY += $(DOC_TARGETS)
1511 $(DOC_TARGETS): scripts_basic FORCE
1512 $(Q)$(MAKE) $(build)=Documentation $@
1513
1514 else # KBUILD_EXTMOD
1515
1516 ###
1517 # External module support.
1518 # When building external modules the kernel used as basis is considered
1519 # read-only, and no consistency checks are made and the make
1520 # system is not used on the basis kernel. If updates are required
1521 # in the basis kernel ordinary make commands (without M=...) must
1522 # be used.
1523 #
1524 # The following are the only valid targets when building external
1525 # modules.
1526 # make M=dir clean Delete all automatically generated files
1527 # make M=dir modules Make all modules in specified dir
1528 # make M=dir Same as 'make M=dir modules'
1529 # make M=dir modules_install
1530 # Install the modules built in the module directory
1531 # Assumes install directory is already created
1532
1533 # We are always building modules
1534 KBUILD_MODULES := 1
1535 PHONY += crmodverdir
1536 crmodverdir:
1537 $(cmd_crmodverdir)
1538
1539 PHONY += $(objtree)/Module.symvers
1540 $(objtree)/Module.symvers:
1541 @test -e $(objtree)/Module.symvers || ( \
1542 echo; \
1543 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1544 echo " is missing; modules will have no dependencies and modversions."; \
1545 echo )
1546
1547 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1548 PHONY += $(module-dirs) modules
1549 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1550 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1551
1552 modules: $(module-dirs)
1553 @$(kecho) ' Building modules, stage 2.';
1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1555
1556 PHONY += modules_install
1557 modules_install: _emodinst_ _emodinst_post
1558
1559 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1560 PHONY += _emodinst_
1561 _emodinst_:
1562 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1563 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1564
1565 PHONY += _emodinst_post
1566 _emodinst_post: _emodinst_
1567 $(call cmd,depmod)
1568
1569 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1570
1571 PHONY += $(clean-dirs) clean
1572 $(clean-dirs):
1573 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1574
1575 clean: rm-dirs := $(MODVERDIR)
1576 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1577
1578 PHONY += help
1579 help:
1580 @echo ' Building external modules.'
1581 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1582 @echo ''
1583 @echo ' modules - default target, build the module(s)'
1584 @echo ' modules_install - install the module'
1585 @echo ' clean - remove generated files in module directory only'
1586 @echo ''
1587
1588 # Dummies...
1589 PHONY += prepare scripts
1590 prepare: ;
1591 scripts: ;
1592 endif # KBUILD_EXTMOD
1593
1594 clean: $(clean-dirs)
1595 $(call cmd,rmdirs)
1596 $(call cmd,rmfiles)
1597 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1598 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1599 -o -name '*.ko.*' \
1600 -o -name '*.dwo' \
1601 -o -name '*.su' \
1602 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1603 -o -name '*.symtypes' -o -name 'modules.order' \
1604 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1605 -o -name '*.c.[012]*.*' \
1606 -o -name '*.ll' \
1607 -o -name '*.gcno' \) -type f -print | xargs rm -f
1608
1609 # Generate tags for editors
1610 # ---------------------------------------------------------------------------
1611 quiet_cmd_tags = GEN $@
1612 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1613
1614 tags TAGS cscope gtags: FORCE
1615 $(call cmd,tags)
1616
1617 # Scripts to check various things for consistency
1618 # ---------------------------------------------------------------------------
1619
1620 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1621
1622 includecheck:
1623 find $(srctree)/* $(RCS_FIND_IGNORE) \
1624 -name '*.[hcS]' -type f -print | sort \
1625 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1626
1627 versioncheck:
1628 find $(srctree)/* $(RCS_FIND_IGNORE) \
1629 -name '*.[hcS]' -type f -print | sort \
1630 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1631
1632 coccicheck:
1633 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1634
1635 namespacecheck:
1636 $(PERL) $(srctree)/scripts/namespace.pl
1637
1638 export_report:
1639 $(PERL) $(srctree)/scripts/export_report.pl
1640
1641 endif #ifeq ($(config-targets),1)
1642 endif #ifeq ($(mixed-targets),1)
1643
1644 PHONY += checkstack kernelrelease kernelversion image_name
1645
1646 # UML needs a little special treatment here. It wants to use the host
1647 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1648 # else wants $(ARCH), including people doing cross-builds, which means
1649 # that $(SUBARCH) doesn't work here.
1650 ifeq ($(ARCH), um)
1651 CHECKSTACK_ARCH := $(SUBARCH)
1652 else
1653 CHECKSTACK_ARCH := $(ARCH)
1654 endif
1655 checkstack:
1656 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1657 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1658
1659 kernelrelease:
1660 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1661
1662 kernelversion:
1663 @echo $(KERNELVERSION)
1664
1665 image_name:
1666 @echo $(KBUILD_IMAGE)
1667
1668 # Clear a bunch of variables before executing the submake
1669 tools/: FORCE
1670 $(Q)mkdir -p $(objtree)/tools
1671 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1672
1673 tools/%: FORCE
1674 $(Q)mkdir -p $(objtree)/tools
1675 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1676
1677 # Single targets
1678 # ---------------------------------------------------------------------------
1679 # Single targets are compatible with:
1680 # - build with mixed source and output
1681 # - build with separate output dir 'make O=...'
1682 # - external modules
1683 #
1684 # target-dir => where to store outputfile
1685 # build-dir => directory in kernel source tree to use
1686
1687 ifeq ($(KBUILD_EXTMOD),)
1688 build-dir = $(patsubst %/,%,$(dir $@))
1689 target-dir = $(dir $@)
1690 else
1691 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1692 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1693 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1694 endif
1695
1696 %.s: %.c prepare scripts FORCE
1697 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1698 %.i: %.c prepare scripts FORCE
1699 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1700 %.o: %.c prepare scripts FORCE
1701 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1702 %.lst: %.c prepare scripts FORCE
1703 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704 %.s: %.S prepare scripts FORCE
1705 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706 %.o: %.S prepare scripts FORCE
1707 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1708 %.symtypes: %.c prepare scripts FORCE
1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710 %.ll: %.c prepare scripts FORCE
1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712
1713 # Modules
1714 /: prepare scripts FORCE
1715 $(cmd_crmodverdir)
1716 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1717 $(build)=$(build-dir)
1718 # Make sure the latest headers are built for Documentation
1719 Documentation/ samples/: headers_install
1720 %/: prepare scripts FORCE
1721 $(cmd_crmodverdir)
1722 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1723 $(build)=$(build-dir)
1724 %.ko: prepare scripts FORCE
1725 $(cmd_crmodverdir)
1726 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1727 $(build)=$(build-dir) $(@:.ko=.o)
1728 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1729
1730 # FIXME Should go into a make.lib or something
1731 # ===========================================================================
1732
1733 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1734 cmd_rmdirs = rm -rf $(rm-dirs)
1735
1736 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1737 cmd_rmfiles = rm -f $(rm-files)
1738
1739 # Run depmod only if we have System.map and depmod is executable
1740 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1741 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1742 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1743
1744 # Create temporary dir for module support files
1745 # clean it up only when building all modules
1746 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1747 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1748
1749 # read all saved command lines
1750
1751 targets := $(wildcard $(sort $(targets)))
1752 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1753
1754 ifneq ($(cmd_files),)
1755 $(cmd_files): ; # Do not try to update included dependency files
1756 include $(cmd_files)
1757 endif
1758
1759 endif # skip-makefile
1760
1761 PHONY += FORCE
1762 FORCE:
1763
1764 # Declare the contents of the .PHONY variable as phony. We keep that
1765 # information in a variable so we can use it in if_changed and friends.
1766 .PHONY: $(PHONY)