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

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