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1	VERSION = 3
2	PATCHLEVEL = 18
3	SUBLEVEL = 0
4	EXTRAVERSION =
5	NAME = Diseased Newt
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 use make's built-in rules and variables
14	# (this increases performance and avoids hard-to-debug behaviour);
15	MAKEFLAGS += -rR
16
17	# Avoid funny character set dependencies
18	unexport LC_ALL
19	LC_COLLATE=C
20	LC_NUMERIC=C
21	export LC_COLLATE LC_NUMERIC
22
23	# Avoid interference with shell env settings
24	unexport GREP_OPTIONS
25
26	# We are using a recursive build, so we need to do a little thinking
27	# to get the ordering right.
28	#
29	# Most importantly: sub-Makefiles should only ever modify files in
30	# their own directory. If in some directory we have a dependency on
31	# a file in another dir (which doesn't happen often, but it's often
32	# unavoidable when linking the built-in.o targets which finally
33	# turn into vmlinux), we will call a sub make in that other dir, and
34	# after that we are sure that everything which is in that other dir
35	# is now up to date.
36	#
37	# The only cases where we need to modify files which have global
38	# effects are thus separated out and done before the recursive
39	# descending is started. They are now explicitly listed as the
40	# prepare rule.
41
42	# Beautify output
43	# ---------------------------------------------------------------------------
44	#
45	# Normally, we echo the whole command before executing it. By making
46	# that echo $($(quiet)$(cmd)), we now have the possibility to set
47	# $(quiet) to choose other forms of output instead, e.g.
48	#
49	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
51	#
52	# If $(quiet) is empty, the whole command will be printed.
53	# If it is set to "quiet_", only the short version will be printed.
54	# If it is set to "silent_", nothing will be printed at all, since
55	# the variable $(silent_cmd_cc_o_c) doesn't exist.
56	#
57	# A simple variant is to prefix commands with $(Q) - that's useful
58	# for commands that shall be hidden in non-verbose mode.
59	#
60	# $(Q)ln $@ :<
61	#
62	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
64	#
65	# To put more focus on warnings, be less verbose as default
66	# Use 'make V=1' to see the full commands
67
68	ifeq ("$(origin V)", "command line")
69	KBUILD_VERBOSE = $(V)
70	endif
71	ifndef KBUILD_VERBOSE
72	KBUILD_VERBOSE = 0
73	endif
74
75	ifeq ($(KBUILD_VERBOSE),1)
76	quiet =
77	Q =
78	else
79	quiet=quiet_
80	Q = @
81	endif
82
83	# If the user is running make -s (silent mode), suppress echoing of
84	# commands
85
86	ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
87	ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88	quiet=silent_
89	endif
90	else # make-3.8x
91	ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92	quiet=silent_
93	endif
94	endif
95
96	export quiet Q KBUILD_VERBOSE
97
98	# kbuild supports saving output files in a separate directory.
99	# To locate output files in a separate directory two syntaxes are supported.
100	# In both cases the working directory must be the root of the kernel src.
101	# 1) O=
102	# Use "make O=dir/to/store/output/files/"
103	#
104	# 2) Set KBUILD_OUTPUT
105	# Set the environment variable KBUILD_OUTPUT to point to the directory
106	# where the output files shall be placed.
107	# export KBUILD_OUTPUT=dir/to/store/output/files/
108	# make
109	#
110	# The O= assignment takes precedence over the KBUILD_OUTPUT environment
111	# variable.
112
113	# KBUILD_SRC is set on invocation of make in OBJ directory
114	# KBUILD_SRC is not intended to be used by the regular user (for now)
115	ifeq ($(KBUILD_SRC),)
116
117	# OK, Make called in directory where kernel src resides
118	# Do we want to locate output files in a separate directory?
119	ifeq ("$(origin O)", "command line")
120	KBUILD_OUTPUT := $(O)
121	endif
122
123	# That's our default target when none is given on the command line
124	PHONY := _all
125	_all:
126
127	# Cancel implicit rules on top Makefile
128	$(CURDIR)/Makefile Makefile: ;
129
130	ifneq ($(KBUILD_OUTPUT),)
131	# Invoke a second make in the output directory, passing relevant variables
132	# check that the output directory actually exists
133	saved-output := $(KBUILD_OUTPUT)
134	KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135	&& /bin/pwd)
136	$(if $(KBUILD_OUTPUT),, \
137	$(error failed to create output directory "$(saved-output)"))
138
139	PHONY += $(MAKECMDGOALS) sub-make
140
141	$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142	@:
143
144	sub-make: FORCE
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 ($(skip-makefile),)
155
156	# Do not print "Entering directory ...",
157	# but we want to display it when entering to the output directory
158	# so that IDEs/editors are able to understand relative filenames.
159	MAKEFLAGS += --no-print-directory
160
161	# Call a source code checker (by default, "sparse") as part of the
162	# C compilation.
163	#
164	# Use 'make C=1' to enable checking of only re-compiled files.
165	# Use 'make C=2' to enable checking of all source files, regardless
166	# of whether they are re-compiled or not.
167	#
168	# See the file "Documentation/sparse.txt" for more details, including
169	# where to get the "sparse" utility.
170
171	ifeq ("$(origin C)", "command line")
172	KBUILD_CHECKSRC = $(C)
173	endif
174	ifndef KBUILD_CHECKSRC
175	KBUILD_CHECKSRC = 0
176	endif
177
178	# Use make M=dir to specify directory of external module to build
179	# Old syntax make ... SUBDIRS=$PWD is still supported
180	# Setting the environment variable KBUILD_EXTMOD take precedence
181	ifdef SUBDIRS
182	KBUILD_EXTMOD ?= $(SUBDIRS)
183	endif
184
185	ifeq ("$(origin M)", "command line")
186	KBUILD_EXTMOD := $(M)
187	endif
188
189	# If building an external module we do not care about the all: rule
190	# but instead _all depend on modules
191	PHONY += all
192	ifeq ($(KBUILD_EXTMOD),)
193	_all: all
194	else
195	_all: modules
196	endif
197
198	ifeq ($(KBUILD_SRC),)
199	# building in the source tree
200	srctree := .
201	else
202	ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203	# building in a subdirectory of the source tree
204	srctree := ..
205	else
206	srctree := $(KBUILD_SRC)
207	endif
208	endif
209	objtree := .
210	src := $(srctree)
211	obj := $(objtree)
212
213	VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
214
215	export srctree objtree VPATH
216
217
218	# SUBARCH tells the usermode build what the underlying arch is. That is set
219	# first, and if a usermode build is happening, the "ARCH=um" on the command
220	# line overrides the setting of ARCH below. If a native build is happening,
221	# then ARCH is assigned, getting whatever value it gets normally, and
222	# SUBARCH is subsequently ignored.
223
224	SUBARCH := $(shell uname -m \| sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225	-e s/sun4u/sparc64/ \
226	-e s/arm.*/arm/ -e s/sa110/arm/ \
227	-e s/s390x/s390/ -e s/parisc64/parisc/ \
228	-e s/ppc./powerpc/ -e s/mips./mips/ \
229	-e s/sh[234]./sh/ -e s/aarch64./arm64/ )
230
231	# Cross compiling and selecting different set of gcc/bin-utils
232	# ---------------------------------------------------------------------------
233	#
234	# When performing cross compilation for other architectures ARCH shall be set
235	# to the target architecture. (See arch/* for the possibilities).
236	# ARCH can be set during invocation of make:
237	# make ARCH=ia64
238	# Another way is to have ARCH set in the environment.
239	# The default ARCH is the host where make is executed.
240
241	# CROSS_COMPILE specify the prefix used for all executables used
242	# during compilation. Only gcc and related bin-utils executables
243	# are prefixed with $(CROSS_COMPILE).
244	# CROSS_COMPILE can be set on the command line
245	# make CROSS_COMPILE=ia64-linux-
246	# Alternatively CROSS_COMPILE can be set in the environment.
247	# A third alternative is to store a setting in .config so that plain
248	# "make" in the configured kernel build directory always uses that.
249	# Default value for CROSS_COMPILE is not to prefix executables
250	# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
251	ARCH ?= $(SUBARCH)
252	CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
253
254	# Architecture as present in compile.h
255	UTS_MACHINE := $(ARCH)
256	SRCARCH := $(ARCH)
257
258	# Additional ARCH settings for x86
259	ifeq ($(ARCH),i386)
260	SRCARCH := x86
261	endif
262	ifeq ($(ARCH),x86_64)
263	SRCARCH := x86
264	endif
265
266	# Additional ARCH settings for sparc
267	ifeq ($(ARCH),sparc32)
268	SRCARCH := sparc
269	endif
270	ifeq ($(ARCH),sparc64)
271	SRCARCH := sparc
272	endif
273
274	# Additional ARCH settings for sh
275	ifeq ($(ARCH),sh64)
276	SRCARCH := sh
277	endif
278
279	# Additional ARCH settings for tile
280	ifeq ($(ARCH),tilepro)
281	SRCARCH := tile
282	endif
283	ifeq ($(ARCH),tilegx)
284	SRCARCH := tile
285	endif
286
287	# Where to locate arch specific headers
288	hdr-arch := $(SRCARCH)
289
290	KCONFIG_CONFIG ?= .config
291	export KCONFIG_CONFIG
292
293	# SHELL used by kbuild
294	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295	else if [ -x /bin/bash ]; then echo /bin/bash; \
296	else echo sh; fi ; fi)
297
298	HOSTCC = gcc
299	HOSTCXX = g++
300	HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
301	HOSTCXXFLAGS = -O2
302
303	ifeq ($(shell $(HOSTCC) -v 2>&1 \| grep -c "clang version"), 1)
304	HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305	-Wno-missing-field-initializers -fno-delete-null-pointer-checks
306	endif
307
308	# Decide whether to build built-in, modular, or both.
309	# Normally, just do built-in.
310
311	KBUILD_MODULES :=
312	KBUILD_BUILTIN := 1
313
314	# If we have only "make modules", don't compile built-in objects.
315	# When we're building modules with modversions, we need to consider
316	# the built-in objects during the descend as well, in order to
317	# make sure the checksums are up to date before we record them.
318
319	ifeq ($(MAKECMDGOALS),modules)
320	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321	endif
322
323	# If we have "make <whatever> modules", compile modules
324	# in addition to whatever we do anyway.
325	# Just "make" or "make all" shall build modules as well
326
327	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328	KBUILD_MODULES := 1
329	endif
330
331	ifeq ($(MAKECMDGOALS),)
332	KBUILD_MODULES := 1
333	endif
334
335	export KBUILD_MODULES KBUILD_BUILTIN
336	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
338	ifneq ($(CC),)
339	ifeq ($(shell $(CC) -v 2>&1 \| grep -c "clang version"), 1)
340	COMPILER := clang
341	else
342	COMPILER := gcc
343	endif
344	export COMPILER
345	endif
346
347	# Look for make include files relative to root of kernel src
348	MAKEFLAGS += --include-dir=$(srctree)
349
350	# We need some generic definitions (do not try to remake the file).
351	$(srctree)/scripts/Kbuild.include: ;
352	include $(srctree)/scripts/Kbuild.include
353
354	# Make variables (CC, etc...)
355	AS = $(CROSS_COMPILE)as
356	LD = $(CROSS_COMPILE)ld
357	CC = $(CROSS_COMPILE)gcc
358	CPP = $(CC) -E
359	AR = $(CROSS_COMPILE)ar
360	NM = $(CROSS_COMPILE)nm
361	STRIP = $(CROSS_COMPILE)strip
362	OBJCOPY = $(CROSS_COMPILE)objcopy
363	OBJDUMP = $(CROSS_COMPILE)objdump
364	AWK = awk
365	GENKSYMS = scripts/genksyms/genksyms
366	INSTALLKERNEL := installkernel
367	DEPMOD = /sbin/depmod
368	PERL = perl
369	PYTHON = python
370	CHECK = sparse
371
372	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
373	-Wbitwise -Wno-return-void $(CF)
374	CFLAGS_MODULE =
375	AFLAGS_MODULE =
376	LDFLAGS_MODULE =
377	CFLAGS_KERNEL =
378	AFLAGS_KERNEL =
379	CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
380
381
382	# Use USERINCLUDE when you must reference the UAPI directories only.
383	USERINCLUDE := \
384	-I$(srctree)/arch/$(hdr-arch)/include/uapi \
385	-Iarch/$(hdr-arch)/include/generated/uapi \
386	-I$(srctree)/include/uapi \
387	-Iinclude/generated/uapi \
388	-include $(srctree)/include/linux/kconfig.h
389
390	# Use LINUXINCLUDE when you must reference the include/ directory.
391	# Needed to be compatible with the O= option
392	LINUXINCLUDE := \
393	-I$(srctree)/arch/$(hdr-arch)/include \
394	-Iarch/$(hdr-arch)/include/generated \
395	$(if $(KBUILD_SRC), -I$(srctree)/include) \
396	-Iinclude \
397	$(USERINCLUDE)
398
399	KBUILD_CPPFLAGS := -D__KERNEL__
400
401	KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
402	-fno-strict-aliasing -fno-common \
403	-Werror-implicit-function-declaration \
404	-Wno-format-security \
405	-std=gnu89
406
407	KBUILD_AFLAGS_KERNEL :=
408	KBUILD_CFLAGS_KERNEL :=
409	KBUILD_AFLAGS := -D__ASSEMBLY__
410	KBUILD_AFLAGS_MODULE := -DMODULE
411	KBUILD_CFLAGS_MODULE := -DMODULE
412	KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
413
414	# Read KERNELRELEASE from include/config/kernel.release (if it exists)
415	KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
416	KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
417
418	export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
419	export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
420	export CPP AR NM STRIP OBJCOPY OBJDUMP
421	export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
422	export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423
424	export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
425	export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
426	export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
427	export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
428	export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
429	export KBUILD_ARFLAGS
430
431	# When compiling out-of-tree modules, put MODVERDIR in the module
432	# tree rather than in the kernel tree. The kernel tree might
433	# even be read-only.
434	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435
436	# Files to ignore in find ... statements
437
438	export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
439	-name CVS -o -name .pc -o -name .hg -o -name .git \) \
440	-prune -o
441	export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
442	--exclude CVS --exclude .pc --exclude .hg --exclude .git
443
444	# ===========================================================================
445	# Rules shared between *config targets and build targets
446
447	# Basic helpers built in scripts/
448	PHONY += scripts_basic
449	scripts_basic:
450	$(Q)$(MAKE) $(build)=scripts/basic
451	$(Q)rm -f .tmp_quiet_recordmcount
452
453	# To avoid any implicit rule to kick in, define an empty command.
454	scripts/basic/%: scripts_basic ;
455
456	PHONY += outputmakefile
457	# outputmakefile generates a Makefile in the output directory, if using a
458	# separate output directory. This allows convenient use of make in the
459	# output directory.
460	outputmakefile:
461	ifneq ($(KBUILD_SRC),)
462	$(Q)ln -fsn $(srctree) source
463	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
464	$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
465	endif
466
467	# Support for using generic headers in asm-generic
468	PHONY += asm-generic
469	asm-generic:
470	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
471	src=asm obj=arch/$(SRCARCH)/include/generated/asm
472	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
473	src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474
475	# To make sure we do not include .config for any of the *config targets
476	# catch them early, and hand them over to scripts/kconfig/Makefile
477	# It is allowed to specify more targets when calling make, including
478	# mixing *config targets and build targets.
479	# For example 'make oldconfig all'.
480	# Detect when mixed targets is specified, and make a second invocation
481	# of make so .config is not included in this case either (for *config).
482
483	version_h := include/generated/uapi/linux/version.h
484
485	no-dot-config-targets := clean mrproper distclean \
486	cscope gtags TAGS tags help %docs check% coccicheck \
487	$(version_h) headers_% archheaders archscripts \
488	kernelversion %src-pkg
489
490	config-targets := 0
491	mixed-targets := 0
492	dot-config := 1
493
494	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496	dot-config := 0
497	endif
498	endif
499
500	ifeq ($(KBUILD_EXTMOD),)
501	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502	config-targets := 1
503	ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
504	mixed-targets := 1
505	endif
506	endif
507	endif
508
509	ifeq ($(mixed-targets),1)
510	# ===========================================================================
511	# We're called with mixed targets (*config and build targets).
512	# Handle them one by one.
513
514	PHONY += $(MAKECMDGOALS) __build_one_by_one
515
516	$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
517	@:
518
519	__build_one_by_one:
520	$(Q)set -e; \
521	for i in $(MAKECMDGOALS); do \
522	$(MAKE) -f $(srctree)/Makefile $$i; \
523	done
524
525	else
526	ifeq ($(config-targets),1)
527	# ===========================================================================
528	# *config targets only - make sure prerequisites are updated, and descend
529	# in scripts/kconfig to make the *config target
530
531	# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
532	# KBUILD_DEFCONFIG may point out an alternative default configuration
533	# used for 'make defconfig'
534	include $(srctree)/arch/$(SRCARCH)/Makefile
535	export KBUILD_DEFCONFIG KBUILD_KCONFIG
536
537	config: scripts_basic outputmakefile FORCE
538	$(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540	%config: scripts_basic outputmakefile FORCE
541	$(Q)$(MAKE) $(build)=scripts/kconfig $@
542
543	else
544	# ===========================================================================
545	# Build targets only - this includes vmlinux, arch specific targets, clean
546	# targets and others. In general all targets except *config targets.
547
548	ifeq ($(KBUILD_EXTMOD),)
549	# Additional helpers built in scripts/
550	# Carefully list dependencies so we do not try to build scripts twice
551	# in parallel
552	PHONY += scripts
553	scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
554	asm-generic
555	$(Q)$(MAKE) $(build)=$(@)
556
557	# Objects we will link into vmlinux / subdirs we need to visit
558	init-y := init/
559	drivers-y := drivers/ sound/ firmware/
560	net-y := net/
561	libs-y := lib/
562	core-y := usr/
563	endif # KBUILD_EXTMOD
564
565	ifeq ($(dot-config),1)
566	# Read in config
567	-include include/config/auto.conf
568
569	ifeq ($(KBUILD_EXTMOD),)
570	# Read in dependencies to all Kconfig* files, make sure to run
571	# oldconfig if changes are detected.
572	-include include/config/auto.conf.cmd
573
574	# To avoid any implicit rule to kick in, define an empty command
575	$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
576
577	# If .config is newer than include/config/auto.conf, someone tinkered
578	# with it and forgot to run make oldconfig.
579	# if auto.conf.cmd is missing then we are probably in a cleaned tree so
580	# we execute the config step to be sure to catch updated Kconfig files
581	include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
582	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
583	else
584	# external modules needs include/generated/autoconf.h and include/config/auto.conf
585	# but do not care if they are up-to-date. Use auto.conf to trigger the test
586	PHONY += include/config/auto.conf
587
588	include/config/auto.conf:
589	$(Q)test -e include/generated/autoconf.h -a -e $@ \|\| ( \
590	echo >&2; \
591	echo >&2 " ERROR: Kernel configuration is invalid."; \
592	echo >&2 " include/generated/autoconf.h or $@ are missing.";\
593	echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
594	echo >&2 ; \
595	/bin/false)
596
597	endif # KBUILD_EXTMOD
598
599	else
600	# Dummy target needed, because used as prerequisite
601	include/config/auto.conf: ;
602	endif # $(dot-config)
603
604	# The all: target is the default when no target is given on the
605	# command line.
606	# This allow a user to issue only 'make' to build a kernel including modules
607	# Defaults to vmlinux, but the arch makefile usually adds further targets
608	all: vmlinux
609
610	include $(srctree)/arch/$(SRCARCH)/Makefile
611
612	KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
613
614	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
615	KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
616	else
617	KBUILD_CFLAGS += -O2
618	endif
619
620	# Tell gcc to never replace conditional load with a non-conditional one
621	KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
622
623	ifdef CONFIG_READABLE_ASM
624	# Disable optimizations that make assembler listings hard to read.
625	# reorder blocks reorders the control in the function
626	# ipa clone creates specialized cloned functions
627	# partial inlining inlines only parts of functions
628	KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
629	$(call cc-option,-fno-ipa-cp-clone,) \
630	$(call cc-option,-fno-partial-inlining)
631	endif
632
633	ifneq ($(CONFIG_FRAME_WARN),0)
634	KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
635	endif
636
637	# Handle stack protector mode.
638	#
639	# Since kbuild can potentially perform two passes (first with the old
640	# .config values and then with updated .config values), we cannot error out
641	# if a desired compiler option is unsupported. If we were to error, kbuild
642	# could never get to the second pass and actually notice that we changed
643	# the option to something that was supported.
644	#
645	# Additionally, we don't want to fallback and/or silently change which compiler
646	# flags will be used, since that leads to producing kernels with different
647	# security feature characteristics depending on the compiler used. ("But I
648	# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
649	#
650	# The middle ground is to warn here so that the failed option is obvious, but
651	# to let the build fail with bad compiler flags so that we can't produce a
652	# kernel when there is a CONFIG and compiler mismatch.
653	#
654	ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
655	stackp-flag := -fstack-protector
656	ifeq ($(call cc-option, $(stackp-flag)),)
657	$(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
658	-fstack-protector not supported by compiler)
659	endif
660	else
661	ifdef CONFIG_CC_STACKPROTECTOR_STRONG
662	stackp-flag := -fstack-protector-strong
663	ifeq ($(call cc-option, $(stackp-flag)),)
664	$(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
665	-fstack-protector-strong not supported by compiler)
666	endif
667	else
668	# Force off for distro compilers that enable stack protector by default.
669	stackp-flag := $(call cc-option, -fno-stack-protector)
670	endif
671	endif
672	KBUILD_CFLAGS += $(stackp-flag)
673
674	ifeq ($(COMPILER),clang)
675	KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
676	KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
677	KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
678	KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
679	KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
680	# Quiet clang warning: comparison of unsigned expression < 0 is always false
681	KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
682	# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
683	# source of a reference will be _MergedGlobals and not on of the whitelisted names.
684	# See modpost pattern 2
685	KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
686	KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
687	else
688
689	# This warning generated too much noise in a regular build.
690	# Use make W=1 to enable this warning (see scripts/Makefile.build)
691	KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
692	endif
693
694	ifdef CONFIG_FRAME_POINTER
695	KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
696	else
697	# Some targets (ARM with Thumb2, for example), can't be built with frame
698	# pointers. For those, we don't have FUNCTION_TRACER automatically
699	# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
700	# incompatible with -fomit-frame-pointer with current GCC, so we don't use
701	# -fomit-frame-pointer with FUNCTION_TRACER.
702	ifndef CONFIG_FUNCTION_TRACER
703	KBUILD_CFLAGS += -fomit-frame-pointer
704	endif
705	endif
706
707	KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
708
709	ifdef CONFIG_DEBUG_INFO
710	ifdef CONFIG_DEBUG_INFO_SPLIT
711	KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
712	else
713	KBUILD_CFLAGS += -g
714	endif
715	KBUILD_AFLAGS += -Wa,-gdwarf-2
716	endif
717	ifdef CONFIG_DEBUG_INFO_DWARF4
718	KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
719	endif
720
721	ifdef CONFIG_DEBUG_INFO_REDUCED
722	KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
723	$(call cc-option,-fno-var-tracking)
724	endif
725
726	ifdef CONFIG_FUNCTION_TRACER
727	ifdef CONFIG_HAVE_FENTRY
728	CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729	endif
730	KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
731	KBUILD_AFLAGS += $(CC_USING_FENTRY)
732	ifdef CONFIG_DYNAMIC_FTRACE
733	ifdef CONFIG_HAVE_C_RECORDMCOUNT
734	BUILD_C_RECORDMCOUNT := y
735	export BUILD_C_RECORDMCOUNT
736	endif
737	endif
738	endif
739
740	# We trigger additional mismatches with less inlining
741	ifdef CONFIG_DEBUG_SECTION_MISMATCH
742	KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
743	endif
744
745	# arch Makefile may override CC so keep this after arch Makefile is included
746	NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
747	CHECKFLAGS += $(NOSTDINC_FLAGS)
748
749	# warn about C99 declaration after statement
750	KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
751
752	# disable pointer signed / unsigned warnings in gcc 4.0
753	KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
754
755	# disable invalid "can't wrap" optimizations for signed / pointers
756	KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
757
758	# conserve stack if available
759	KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
760
761	# disallow errors like 'EXPORT_GPL(foo);' with missing header
762	KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
763
764	# require functions to have arguments in prototypes, not empty 'int foo()'
765	KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
766
767	# Prohibit date/time macros, which would make the build non-deterministic
768	KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
769
770	# use the deterministic mode of AR if available
771	KBUILD_ARFLAGS := $(call ar-option,D)
772
773	# check for 'asm goto'
774	ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
775	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
776	endif
777
778	include $(srctree)/scripts/Makefile.extrawarn
779
780	# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
781	KBUILD_CPPFLAGS += $(KCPPFLAGS)
782	KBUILD_AFLAGS += $(KAFLAGS)
783	KBUILD_CFLAGS += $(KCFLAGS)
784
785	# Use --build-id when available.
786	LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
787	$(call cc-ldoption, -Wl$(comma)--build-id,))
788	KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
789	LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
790
791	ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
792	LDFLAGS_vmlinux += $(call ld-option, -X,)
793	endif
794
795	# Default kernel image to build when no specific target is given.
796	# KBUILD_IMAGE may be overruled on the command line or
797	# set in the environment
798	# Also any assignments in arch/$(ARCH)/Makefile take precedence over
799	# this default value
800	export KBUILD_IMAGE ?= vmlinux
801
802	#
803	# INSTALL_PATH specifies where to place the updated kernel and system map
804	# images. Default is /boot, but you can set it to other values
805	export INSTALL_PATH ?= /boot
806
807	#
808	# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
809	# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
810	# an argument if needed. Otherwise it defaults to the kernel install path
811	#
812	export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
813
814	#
815	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
816	# relocations required by build roots. This is not defined in the
817	# makefile but the argument can be passed to make if needed.
818	#
819
820	MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
821	export MODLIB
822
823	#
824	# INSTALL_MOD_STRIP, if defined, will cause modules to be
825	# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
826	# the default option --strip-debug will be used. Otherwise,
827	# INSTALL_MOD_STRIP value will be used as the options to the strip command.
828
829	ifdef INSTALL_MOD_STRIP
830	ifeq ($(INSTALL_MOD_STRIP),1)
831	mod_strip_cmd = $(STRIP) --strip-debug
832	else
833	mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
834	endif # INSTALL_MOD_STRIP=1
835	else
836	mod_strip_cmd = true
837	endif # INSTALL_MOD_STRIP
838	export mod_strip_cmd
839
840	# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
841	# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
842	# or CONFIG_MODULE_COMPRESS_XZ.
843
844	mod_compress_cmd = true
845	ifdef CONFIG_MODULE_COMPRESS
846	ifdef CONFIG_MODULE_COMPRESS_GZIP
847	mod_compress_cmd = gzip -n
848	endif # CONFIG_MODULE_COMPRESS_GZIP
849	ifdef CONFIG_MODULE_COMPRESS_XZ
850	mod_compress_cmd = xz
851	endif # CONFIG_MODULE_COMPRESS_XZ
852	endif # CONFIG_MODULE_COMPRESS
853	export mod_compress_cmd
854
855	# Select initial ramdisk compression format, default is gzip(1).
856	# This shall be used by the dracut(8) tool while creating an initramfs image.
857	#
858	INITRD_COMPRESS-y := gzip
859	INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
860	INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
861	INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
862	INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
863	INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
864	# do not export INITRD_COMPRESS, since we didn't actually
865	# choose a sane default compression above.
866	# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
867
868	ifdef CONFIG_MODULE_SIG_ALL
869	MODSECKEY = ./signing_key.priv
870	MODPUBKEY = ./signing_key.x509
871	export MODPUBKEY
872	mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
873	else
874	mod_sign_cmd = true
875	endif
876	export mod_sign_cmd
877
878
879	ifeq ($(KBUILD_EXTMOD),)
880	core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
881
882	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
883	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
884	$(net-y) $(net-m) $(libs-y) $(libs-m)))
885
886	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
887	$(init-) $(core-) $(drivers-) $(net-) $(libs-))))
888
889	init-y := $(patsubst %/, %/built-in.o, $(init-y))
890	core-y := $(patsubst %/, %/built-in.o, $(core-y))
891	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
892	net-y := $(patsubst %/, %/built-in.o, $(net-y))
893	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
894	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
895	libs-y := $(libs-y1) $(libs-y2)
896
897	# Externally visible symbols (used by link-vmlinux.sh)
898	export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
899	export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
900	export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
901	export LDFLAGS_vmlinux
902	# used by scripts/pacmage/Makefile
903	export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
904
905	vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
906
907	# Final link of vmlinux
908	cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
909	quiet_cmd_link-vmlinux = LINK $@
910
911	# Include targets which we want to
912	# execute if the rest of the kernel build went well.
913	vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
914	ifdef CONFIG_HEADERS_CHECK
915	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
916	endif
917	ifdef CONFIG_SAMPLES
918	$(Q)$(MAKE) $(build)=samples
919	endif
920	ifdef CONFIG_BUILD_DOCSRC
921	$(Q)$(MAKE) $(build)=Documentation
922	endif
923	+$(call if_changed,link-vmlinux)
924
925	# The actual objects are generated when descending,
926	# make sure no implicit rule kicks in
927	$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
928
929	# Handle descending into subdirectories listed in $(vmlinux-dirs)
930	# Preset locale variables to speed up the build process. Limit locale
931	# tweaks to this spot to avoid wrong language settings when running
932	# make menuconfig etc.
933	# Error messages still appears in the original language
934
935	PHONY += $(vmlinux-dirs)
936	$(vmlinux-dirs): prepare scripts
937	$(Q)$(MAKE) $(build)=$@
938
939	define filechk_kernel.release
940	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
941	endef
942
943	# Store (new) KERNELRELEASE string in include/config/kernel.release
944	include/config/kernel.release: include/config/auto.conf FORCE
945	$(call filechk,kernel.release)
946
947
948	# Things we need to do before we recursively start building the kernel
949	# or the modules are listed in "prepare".
950	# A multi level approach is used. prepareN is processed before prepareN-1.
951	# archprepare is used in arch Makefiles and when processed asm symlink,
952	# version.h and scripts_basic is processed / created.
953
954	# Listed in dependency order
955	PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
956
957	# prepare3 is used to check if we are building in a separate output directory,
958	# and if so do:
959	# 1) Check that make has not been executed in the kernel src $(srctree)
960	prepare3: include/config/kernel.release
961	ifneq ($(KBUILD_SRC),)
962	@$(kecho) ' Using $(srctree) as source for kernel'
963	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
964	echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
965	echo >&2 " in the '$(srctree)' directory.";\
966	/bin/false; \
967	fi;
968	endif
969
970	# prepare2 creates a makefile if using a separate output directory
971	prepare2: prepare3 outputmakefile asm-generic
972
973	prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
974	include/config/auto.conf
975	$(cmd_crmodverdir)
976
977	archprepare: archheaders archscripts prepare1 scripts_basic
978
979	prepare0: archprepare FORCE
980	$(Q)$(MAKE) $(build)=.
981
982	# All the preparing..
983	prepare: prepare0
984
985	# Generate some files
986	# ---------------------------------------------------------------------------
987
988	# KERNELRELEASE can change from a few different places, meaning version.h
989	# needs to be updated, so this check is forced on all builds
990
991	uts_len := 64
992	define filechk_utsrelease.h
993	if [ `echo -n "$(KERNELRELEASE)" \| wc -c ` -gt $(uts_len) ]; then \
994	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
995	exit 1; \
996	fi; \
997	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
998	endef
999
1000	define filechk_version.h
1001	(echo \#define LINUX_VERSION_CODE $(shell \
1002	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1003	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1004	endef
1005
1006	$(version_h): $(srctree)/Makefile FORCE
1007	$(call filechk,version.h)
1008
1009	include/generated/utsrelease.h: include/config/kernel.release FORCE
1010	$(call filechk,utsrelease.h)
1011
1012	PHONY += headerdep
1013	headerdep:
1014	$(Q)find $(srctree)/include/ -name '*.h' \| xargs --max-args 1 \
1015	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1016
1017	# ---------------------------------------------------------------------------
1018
1019	PHONY += depend dep
1020	depend dep:
1021	@echo '*** Warning: make $@ is unnecessary now.'
1022
1023	# ---------------------------------------------------------------------------
1024	# Firmware install
1025	INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1026	export INSTALL_FW_PATH
1027
1028	PHONY += firmware_install
1029	firmware_install: FORCE
1030	@mkdir -p $(objtree)/firmware
1031	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032
1033	# ---------------------------------------------------------------------------
1034	# Kernel headers
1035
1036	#Default location for installed headers
1037	export INSTALL_HDR_PATH = $(objtree)/usr
1038
1039	hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040
1041	# If we do an all arch process set dst to asm-$(hdr-arch)
1042	hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043
1044	PHONY += archheaders
1045	archheaders:
1046
1047	PHONY += archscripts
1048	archscripts:
1049
1050	PHONY += __headers
1051	__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1052	$(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054	PHONY += headers_install_all
1055	headers_install_all:
1056	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058	PHONY += headers_install
1059	headers_install: __headers
1060	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1061	$(error Headers not exportable for the $(SRCARCH) architecture))
1062	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1063	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1064
1065	PHONY += headers_check_all
1066	headers_check_all: headers_install_all
1067	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069	PHONY += headers_check
1070	headers_check: headers_install
1071	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1072	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1073
1074	# ---------------------------------------------------------------------------
1075	# Kernel selftest
1076
1077	PHONY += kselftest
1078	kselftest:
1079	$(Q)$(MAKE) -C tools/testing/selftests run_tests
1080
1081	# ---------------------------------------------------------------------------
1082	# Modules
1083
1084	ifdef CONFIG_MODULES
1085
1086	# By default, build modules as well
1087
1088	all: modules
1089
1090	# Build modules
1091	#
1092	# A module can be listed more than once in obj-m resulting in
1093	# duplicate lines in modules.order files. Those are removed
1094	# using awk while concatenating to the final file.
1095
1096	PHONY += modules
1097	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1098	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1099	@$(kecho) ' Building modules, stage 2.';
1100	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1101	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1102
1103	modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1104	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1105
1106	%/modules.builtin: include/config/auto.conf
1107	$(Q)$(MAKE) $(modbuiltin)=$*
1108
1109
1110	# Target to prepare building external modules
1111	PHONY += modules_prepare
1112	modules_prepare: prepare scripts
1113
1114	# Target to install modules
1115	PHONY += modules_install
1116	modules_install: _modinst_ _modinst_post
1117
1118	PHONY += _modinst_
1119	_modinst_:
1120	@rm -rf $(MODLIB)/kernel
1121	@rm -f $(MODLIB)/source
1122	@mkdir -p $(MODLIB)/kernel
1123	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1124	@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1125	rm -f $(MODLIB)/build ; \
1126	ln -s $(CURDIR) $(MODLIB)/build ; \
1127	fi
1128	@cp -f $(objtree)/modules.order $(MODLIB)/
1129	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1130	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1131
1132	# This depmod is only for convenience to give the initial
1133	# boot a modules.dep even before / is mounted read-write. However the
1134	# boot script depmod is the master version.
1135	PHONY += _modinst_post
1136	_modinst_post: _modinst_
1137	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1138	$(call cmd,depmod)
1139
1140	ifeq ($(CONFIG_MODULE_SIG), y)
1141	PHONY += modules_sign
1142	modules_sign:
1143	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1144	endif
1145
1146	else # CONFIG_MODULES
1147
1148	# Modules not configured
1149	# ---------------------------------------------------------------------------
1150
1151	modules modules_install: FORCE
1152	@echo >&2
1153	@echo >&2 "The present kernel configuration has modules disabled."
1154	@echo >&2 "Type 'make config' and enable loadable module support."
1155	@echo >&2 "Then build a kernel with module support enabled."
1156	@echo >&2
1157	@exit 1
1158
1159	endif # CONFIG_MODULES
1160
1161	###
1162	# Cleaning is done on three levels.
1163	# make clean Delete most generated files
1164	# Leave enough to build external modules
1165	# make mrproper Delete the current configuration, and all generated files
1166	# make distclean Remove editor backup files, patch leftover files and the like
1167
1168	# Directories & files removed with 'make clean'
1169	CLEAN_DIRS += $(MODVERDIR)
1170
1171	# Directories & files removed with 'make mrproper'
1172	MRPROPER_DIRS += include/config usr/include include/generated \
1173	arch/*/include/generated .tmp_objdiff
1174	MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1175	Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1176	signing_key.priv signing_key.x509 x509.genkey \
1177	extra_certificates signing_key.x509.keyid \
1178	signing_key.x509.signer include/linux/version.h
1179
1180	# clean - Delete most, but leave enough to build external modules
1181	#
1182	clean: rm-dirs := $(CLEAN_DIRS)
1183	clean: rm-files := $(CLEAN_FILES)
1184	clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1185
1186	PHONY += $(clean-dirs) clean archclean vmlinuxclean
1187	$(clean-dirs):
1188	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1189
1190	vmlinuxclean:
1191	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1192
1193	clean: archclean vmlinuxclean
1194
1195	# mrproper - Delete all generated files, including .config
1196	#
1197	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1198	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1199	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1200
1201	PHONY += $(mrproper-dirs) mrproper archmrproper
1202	$(mrproper-dirs):
1203	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1204
1205	mrproper: clean archmrproper $(mrproper-dirs)
1206	$(call cmd,rmdirs)
1207	$(call cmd,rmfiles)
1208
1209	# distclean
1210	#
1211	PHONY += distclean
1212
1213	distclean: mrproper
1214	@find $(srctree) $(RCS_FIND_IGNORE) \
1215	\( -name '.orig' -o -name '.rej' -o -name '*~' \
1216	-o -name '.bak' -o -name '##' -o -name '.*.orig' \
1217	-o -name '..rej' -o -name '%' -o -name 'core' \) \
1218	-type f -print \| xargs rm -f
1219
1220
1221	# Packaging of the kernel to various formats
1222	# ---------------------------------------------------------------------------
1223	# rpm target kept for backward compatibility
1224	package-dir := scripts/package
1225
1226	%src-pkg: FORCE
1227	$(Q)$(MAKE) $(build)=$(package-dir) $@
1228	%pkg: include/config/kernel.release FORCE
1229	$(Q)$(MAKE) $(build)=$(package-dir) $@
1230	rpm: include/config/kernel.release FORCE
1231	$(Q)$(MAKE) $(build)=$(package-dir) $@
1232
1233
1234	# Brief documentation of the typical targets used
1235	# ---------------------------------------------------------------------------
1236
1237	boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1238	boards := $(notdir $(boards))
1239	board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs//_defconfig))
1240	board-dirs := $(sort $(notdir $(board-dirs:/=)))
1241
1242	help:
1243	@echo 'Cleaning targets:'
1244	@echo ' clean - Remove most generated files but keep the config and'
1245	@echo ' enough build support to build external modules'
1246	@echo ' mrproper - Remove all generated files + config + various backup files'
1247	@echo ' distclean - mrproper + remove editor backup and patch files'
1248	@echo ''
1249	@echo 'Configuration targets:'
1250	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1251	@echo ''
1252	@echo 'Other generic targets:'
1253	@echo ' all - Build all targets marked with [*]'
1254	@echo '* vmlinux - Build the bare kernel'
1255	@echo '* modules - Build all modules'
1256	@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1257	@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1258	@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1259	@echo ' dir/ - Build all files in dir and below'
1260	@echo ' dir/file.[oisS] - Build specified target only'
1261	@echo ' dir/file.lst - Build specified mixed source/assembly target only'
1262	@echo ' (requires a recent binutils and recent build (System.map))'
1263	@echo ' dir/file.ko - Build module including final link'
1264	@echo ' modules_prepare - Set up for building external modules'
1265	@echo ' tags/TAGS - Generate tags file for editors'
1266	@echo ' cscope - Generate cscope index'
1267	@echo ' gtags - Generate GNU GLOBAL index'
1268	@echo ' kernelrelease - Output the release version string (use with make -s)'
1269	@echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1270	@echo ' image_name - Output the image name (use with make -s)'
1271	@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1272	echo ' (default: $(INSTALL_HDR_PATH))'; \
1273	echo ''
1274	@echo 'Static analysers'
1275	@echo ' checkstack - Generate a list of stack hogs'
1276	@echo ' namespacecheck - Name space analysis on compiled kernel'
1277	@echo ' versioncheck - Sanity check on version.h usage'
1278	@echo ' includecheck - Check for duplicate included header files'
1279	@echo ' export_report - List the usages of all exported symbols'
1280	@echo ' headers_check - Sanity check on exported headers'
1281	@echo ' headerdep - Detect inclusion cycles in headers'
1282	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1283	@echo ''
1284	@echo 'Kernel selftest'
1285	@echo ' kselftest - Build and run kernel selftest (run as root)'
1286	@echo ' Build, install, and boot kernel before'
1287	@echo ' running kselftest on it'
1288	@echo ''
1289	@echo 'Kernel packaging:'
1290	@$(MAKE) $(build)=$(package-dir) help
1291	@echo ''
1292	@echo 'Documentation targets:'
1293	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1294	@echo ''
1295	@echo 'Architecture specific targets ($(SRCARCH)):'
1296	@$(if $(archhelp),$(archhelp),\
1297	echo ' No architecture specific help defined for $(SRCARCH)')
1298	@echo ''
1299	@$(if $(boards), \
1300	$(foreach b, $(boards), \
1301	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1302	echo '')
1303	@$(if $(board-dirs), \
1304	$(foreach b, $(board-dirs), \
1305	printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1306	printf " %-16s - Show all of the above\\n" help-boards; \
1307	echo '')
1308
1309	@echo ' make V=0\|1 [targets] 0 => quiet build (default), 1 => verbose build'
1310	@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1311	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1312	@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1313	@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1314	@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1315	@echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1316	@echo ' 1: warnings which may be relevant and do not occur too often'
1317	@echo ' 2: warnings which occur quite often but may still be relevant'
1318	@echo ' 3: more obscure warnings, can most likely be ignored'
1319	@echo ' Multiple levels can be combined with W=12 or W=123'
1320	@echo ''
1321	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
1322	@echo 'For further info see the ./README file'
1323
1324
1325	help-board-dirs := $(addprefix help-,$(board-dirs))
1326
1327	help-boards: $(help-board-dirs)
1328
1329	boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$/_defconfig))
1330
1331	$(help-board-dirs): help-%:
1332	@echo 'Architecture specific targets ($(SRCARCH) $*):'
1333	@$(if $(boards-per-dir), \
1334	$(foreach b, $(boards-per-dir), \
1335	printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1336	echo '')
1337
1338
1339	# Documentation targets
1340	# ---------------------------------------------------------------------------
1341	%docs: scripts_basic FORCE
1342	$(Q)$(MAKE) $(build)=scripts build_docproc
1343	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1344
1345	else # KBUILD_EXTMOD
1346
1347	###
1348	# External module support.
1349	# When building external modules the kernel used as basis is considered
1350	# read-only, and no consistency checks are made and the make
1351	# system is not used on the basis kernel. If updates are required
1352	# in the basis kernel ordinary make commands (without M=...) must
1353	# be used.
1354	#
1355	# The following are the only valid targets when building external
1356	# modules.
1357	# make M=dir clean Delete all automatically generated files
1358	# make M=dir modules Make all modules in specified dir
1359	# make M=dir Same as 'make M=dir modules'
1360	# make M=dir modules_install
1361	# Install the modules built in the module directory
1362	# Assumes install directory is already created
1363
1364	# We are always building modules
1365	KBUILD_MODULES := 1
1366	PHONY += crmodverdir
1367	crmodverdir:
1368	$(cmd_crmodverdir)
1369
1370	PHONY += $(objtree)/Module.symvers
1371	$(objtree)/Module.symvers:
1372	@test -e $(objtree)/Module.symvers \|\| ( \
1373	echo; \
1374	echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1375	echo " is missing; modules will have no dependencies and modversions."; \
1376	echo )
1377
1378	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1379	PHONY += $(module-dirs) modules
1380	$(module-dirs): crmodverdir $(objtree)/Module.symvers
1381	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1382
1383	modules: $(module-dirs)
1384	@$(kecho) ' Building modules, stage 2.';
1385	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1386
1387	PHONY += modules_install
1388	modules_install: _emodinst_ _emodinst_post
1389
1390	install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1391	PHONY += _emodinst_
1392	_emodinst_:
1393	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1394	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1395
1396	PHONY += _emodinst_post
1397	_emodinst_post: _emodinst_
1398	$(call cmd,depmod)
1399
1400	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1401
1402	PHONY += $(clean-dirs) clean
1403	$(clean-dirs):
1404	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1405
1406	clean: rm-dirs := $(MODVERDIR)
1407	clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1408
1409	help:
1410	@echo ' Building external modules.'
1411	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1412	@echo ''
1413	@echo ' modules - default target, build the module(s)'
1414	@echo ' modules_install - install the module'
1415	@echo ' clean - remove generated files in module directory only'
1416	@echo ''
1417
1418	# Dummies...
1419	PHONY += prepare scripts
1420	prepare: ;
1421	scripts: ;
1422	endif # KBUILD_EXTMOD
1423
1424	clean: $(clean-dirs)
1425	$(call cmd,rmdirs)
1426	$(call cmd,rmfiles)
1427	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1428	\( -name '.[oas]' -o -name '.ko' -o -name '.*.cmd' \
1429	-o -name '.ko.' \
1430	-o -name '*.dwo' \
1431	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \
1432	-o -name '*.symtypes' -o -name 'modules.order' \
1433	-o -name modules.builtin -o -name '.tmp_.o.' \
1434	-o -name '*.gcno' \) -type f -print \| xargs rm -f
1435
1436	# Generate tags for editors
1437	# ---------------------------------------------------------------------------
1438	quiet_cmd_tags = GEN $@
1439	cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1440
1441	tags TAGS cscope gtags: FORCE
1442	$(call cmd,tags)
1443
1444	# Scripts to check various things for consistency
1445	# ---------------------------------------------------------------------------
1446
1447	PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1448
1449	includecheck:
1450	find $(srctree)/* $(RCS_FIND_IGNORE) \
1451	-name '*.[hcS]' -type f -print \| sort \
1452	\| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1453
1454	versioncheck:
1455	find $(srctree)/* $(RCS_FIND_IGNORE) \
1456	-name '*.[hcS]' -type f -print \| sort \
1457	\| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1458
1459	coccicheck:
1460	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1461
1462	namespacecheck:
1463	$(PERL) $(srctree)/scripts/namespace.pl
1464
1465	export_report:
1466	$(PERL) $(srctree)/scripts/export_report.pl
1467
1468	endif #ifeq ($(config-targets),1)
1469	endif #ifeq ($(mixed-targets),1)
1470
1471	PHONY += checkstack kernelrelease kernelversion image_name
1472
1473	# UML needs a little special treatment here. It wants to use the host
1474	# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1475	# else wants $(ARCH), including people doing cross-builds, which means
1476	# that $(SUBARCH) doesn't work here.
1477	ifeq ($(ARCH), um)
1478	CHECKSTACK_ARCH := $(SUBARCH)
1479	else
1480	CHECKSTACK_ARCH := $(ARCH)
1481	endif
1482	checkstack:
1483	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') \| \
1484	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1485
1486	kernelrelease:
1487	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1488
1489	kernelversion:
1490	@echo $(KERNELVERSION)
1491
1492	image_name:
1493	@echo $(KBUILD_IMAGE)
1494
1495	# Clear a bunch of variables before executing the submake
1496	tools/: FORCE
1497	$(Q)mkdir -p $(objtree)/tools
1498	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1499
1500	tools/%: FORCE
1501	$(Q)mkdir -p $(objtree)/tools
1502	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1503
1504	# Single targets
1505	# ---------------------------------------------------------------------------
1506	# Single targets are compatible with:
1507	# - build with mixed source and output
1508	# - build with separate output dir 'make O=...'
1509	# - external modules
1510	#
1511	# target-dir => where to store outputfile
1512	# build-dir => directory in kernel source tree to use
1513
1514	ifeq ($(KBUILD_EXTMOD),)
1515	build-dir = $(patsubst %/,%,$(dir $@))
1516	target-dir = $(dir $@)
1517	else
1518	zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1519	build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1520	target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1521	endif
1522
1523	%.s: %.c prepare scripts FORCE
1524	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525	%.i: %.c prepare scripts FORCE
1526	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527	%.o: %.c prepare scripts FORCE
1528	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529	%.lst: %.c prepare scripts FORCE
1530	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531	%.s: %.S prepare scripts FORCE
1532	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533	%.o: %.S prepare scripts FORCE
1534	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535	%.symtypes: %.c prepare scripts FORCE
1536	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537
1538	# Modules
1539	/: prepare scripts FORCE
1540	$(cmd_crmodverdir)
1541	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1542	$(build)=$(build-dir)
1543	# Make sure the latest headers are built for Documentation
1544	Documentation/: headers_install
1545	%/: prepare scripts FORCE
1546	$(cmd_crmodverdir)
1547	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548	$(build)=$(build-dir)
1549	%.ko: prepare scripts FORCE
1550	$(cmd_crmodverdir)
1551	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1552	$(build)=$(build-dir) $(@:.ko=.o)
1553	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1554
1555	# FIXME Should go into a make.lib or something
1556	# ===========================================================================
1557
1558	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1559	cmd_rmdirs = rm -rf $(rm-dirs)
1560
1561	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1562	cmd_rmfiles = rm -f $(rm-files)
1563
1564	# Run depmod only if we have System.map and depmod is executable
1565	quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1566	cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1567	$(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1568
1569	# Create temporary dir for module support files
1570	# clean it up only when building all modules
1571	cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572	$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573
1574	# read all saved command lines
1575
1576	targets := $(wildcard $(sort $(targets)))
1577	cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578
1579	ifneq ($(cmd_files),)
1580	$(cmd_files): ; # Do not try to update included dependency files
1581	include $(cmd_files)
1582	endif
1583
1584	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585	# Usage:
1586	# $(Q)$(MAKE) $(clean)=dir
1587	clean := -f $(srctree)/scripts/Makefile.clean obj
1588
1589	endif # skip-makefile
1590
1591	PHONY += FORCE
1592	FORCE:
1593
1594	# Declare the contents of the .PHONY variable as phony. We keep that
1595	# information in a variable so we can use it in if_changed and friends.
1596	.PHONY: $(PHONY)
1597

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