projects/linux·blob 92e963f5 · refs

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1VERSION = 4
2PATCHLEVEL = 5
3SUBLEVEL = 0
4EXTRAVERSION = -rc1
5NAME = Blurry Fish Butt
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# o Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18# Avoid funny character set dependencies
19unexport LC_ALL
20LC_COLLATE=C
21LC_NUMERIC=C
22export LC_COLLATE LC_NUMERIC
23
24# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
27# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
43# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61# $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
66# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
69ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
76ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90endif
91else # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124# That's our default target when none is given on the command line
125PHONY := _all
126_all:
127
128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
131ifneq ($(KBUILD_OUTPUT),)
132# Invoke a second make in the output directory, passing relevant variables
133# check that the output directory actually exists
134saved-output := $(KBUILD_OUTPUT)
135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 && /bin/pwd)
137$(if $(KBUILD_OUTPUT),, \
138 $(error failed to create output directory "$(saved-output)"))
139
140PHONY += $(MAKECMDGOALS) sub-make
141
142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
143 @:
144
145sub-make: FORCE
146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/sparse.txt" for more details, including
170# where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183 KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
188endif
189
190# If building an external module we do not care about the all: rule
191# but instead _all depend on modules
192PHONY += all
193ifeq ($(KBUILD_EXTMOD),)
194_all: all
195else
196_all: modules
197endif
198
199ifeq ($(KBUILD_SRC),)
200 # building in the source tree
201 srctree := .
202else
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
205 srctree := ..
206 else
207 srctree := $(KBUILD_SRC)
208 endif
209endif
210objtree := .
211src := $(srctree)
212obj := $(objtree)
213
214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215
216export srctree objtree VPATH
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
224SUBARCH := $(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
251ARCH ?= $(SUBARCH)
252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
253
254# Architecture as present in compile.h
255UTS_MACHINE := $(ARCH)
256SRCARCH := $(ARCH)
257
258# Additional ARCH settings for x86
259ifeq ($(ARCH),i386)
260 SRCARCH := x86
261endif
262ifeq ($(ARCH),x86_64)
263 SRCARCH := x86
264endif
265
266# Additional ARCH settings for sparc
267ifeq ($(ARCH),sparc32)
268 SRCARCH := sparc
269endif
270ifeq ($(ARCH),sparc64)
271 SRCARCH := sparc
272endif
273
274# Additional ARCH settings for sh
275ifeq ($(ARCH),sh64)
276 SRCARCH := sh
277endif
278
279# Additional ARCH settings for tile
280ifeq ($(ARCH),tilepro)
281 SRCARCH := tile
282endif
283ifeq ($(ARCH),tilegx)
284 SRCARCH := tile
285endif
286
287# Where to locate arch specific headers
288hdr-arch := $(SRCARCH)
289
290KCONFIG_CONFIG ?= .config
291export KCONFIG_CONFIG
292
293# SHELL used by kbuild
294CONFIG_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
298HOSTCC = gcc
299HOSTCXX = g++
300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
301HOSTCXXFLAGS = -O2
302
303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306endif
307
308# Decide whether to build built-in, modular, or both.
309# Normally, just do built-in.
310
311KBUILD_MODULES :=
312KBUILD_BUILTIN := 1
313
314# If we have only "make modules", don't compile built-in objects.
315# When we're building modules with modversions, we need to consider
316# the built-in objects during the descend as well, in order to
317# make sure the checksums are up to date before we record them.
318
319ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321endif
322
323# If we have "make <whatever> modules", compile modules
324# in addition to whatever we do anyway.
325# Just "make" or "make all" shall build modules as well
326
327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328 KBUILD_MODULES := 1
329endif
330
331ifeq ($(MAKECMDGOALS),)
332 KBUILD_MODULES := 1
333endif
334
335export KBUILD_MODULES KBUILD_BUILTIN
336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
338# We need some generic definitions (do not try to remake the file).
339scripts/Kbuild.include: ;
340include scripts/Kbuild.include
341
342# Make variables (CC, etc...)
343AS = $(CROSS_COMPILE)as
344LD = $(CROSS_COMPILE)ld
345CC = $(CROSS_COMPILE)gcc
346CPP = $(CC) -E
347AR = $(CROSS_COMPILE)ar
348NM = $(CROSS_COMPILE)nm
349STRIP = $(CROSS_COMPILE)strip
350OBJCOPY = $(CROSS_COMPILE)objcopy
351OBJDUMP = $(CROSS_COMPILE)objdump
352AWK = awk
353GENKSYMS = scripts/genksyms/genksyms
354INSTALLKERNEL := installkernel
355DEPMOD = /sbin/depmod
356PERL = perl
357PYTHON = python
358CHECK = sparse
359
360CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361 -Wbitwise -Wno-return-void $(CF)
362CFLAGS_MODULE =
363AFLAGS_MODULE =
364LDFLAGS_MODULE =
365CFLAGS_KERNEL =
366AFLAGS_KERNEL =
367CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
368
369
370# Use USERINCLUDE when you must reference the UAPI directories only.
371USERINCLUDE := \
372 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
373 -Iarch/$(hdr-arch)/include/generated/uapi \
374 -I$(srctree)/include/uapi \
375 -Iinclude/generated/uapi \
376 -include $(srctree)/include/linux/kconfig.h
377
378# Use LINUXINCLUDE when you must reference the include/ directory.
379# Needed to be compatible with the O= option
380LINUXINCLUDE := \
381 -I$(srctree)/arch/$(hdr-arch)/include \
382 -Iarch/$(hdr-arch)/include/generated/uapi \
383 -Iarch/$(hdr-arch)/include/generated \
384 $(if $(KBUILD_SRC), -I$(srctree)/include) \
385 -Iinclude \
386 $(USERINCLUDE)
387
388KBUILD_CPPFLAGS := -D__KERNEL__
389
390KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
391 -fno-strict-aliasing -fno-common \
392 -Werror-implicit-function-declaration \
393 -Wno-format-security \
394 -std=gnu89
395
396KBUILD_AFLAGS_KERNEL :=
397KBUILD_CFLAGS_KERNEL :=
398KBUILD_AFLAGS := -D__ASSEMBLY__
399KBUILD_AFLAGS_MODULE := -DMODULE
400KBUILD_CFLAGS_MODULE := -DMODULE
401KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
402
403# Read KERNELRELEASE from include/config/kernel.release (if it exists)
404KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
405KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
406
407export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
408export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
409export CPP AR NM STRIP OBJCOPY OBJDUMP
410export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
411export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
412
413export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
414export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN CFLAGS_UBSAN
415export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
416export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
417export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
418export KBUILD_ARFLAGS
419
420# When compiling out-of-tree modules, put MODVERDIR in the module
421# tree rather than in the kernel tree. The kernel tree might
422# even be read-only.
423export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
424
425# Files to ignore in find ... statements
426
427export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
428 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
429 -prune -o
430export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
431 --exclude CVS --exclude .pc --exclude .hg --exclude .git
432
433# ===========================================================================
434# Rules shared between *config targets and build targets
435
436# Basic helpers built in scripts/
437PHONY += scripts_basic
438scripts_basic:
439 $(Q)$(MAKE) $(build)=scripts/basic
440 $(Q)rm -f .tmp_quiet_recordmcount
441
442# To avoid any implicit rule to kick in, define an empty command.
443scripts/basic/%: scripts_basic ;
444
445PHONY += outputmakefile
446# outputmakefile generates a Makefile in the output directory, if using a
447# separate output directory. This allows convenient use of make in the
448# output directory.
449outputmakefile:
450ifneq ($(KBUILD_SRC),)
451 $(Q)ln -fsn $(srctree) source
452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
453 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
454endif
455
456# Support for using generic headers in asm-generic
457PHONY += asm-generic
458asm-generic:
459 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
460 src=asm obj=arch/$(SRCARCH)/include/generated/asm
461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
462 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
463
464# To make sure we do not include .config for any of the *config targets
465# catch them early, and hand them over to scripts/kconfig/Makefile
466# It is allowed to specify more targets when calling make, including
467# mixing *config targets and build targets.
468# For example 'make oldconfig all'.
469# Detect when mixed targets is specified, and make a second invocation
470# of make so .config is not included in this case either (for *config).
471
472version_h := include/generated/uapi/linux/version.h
473old_version_h := include/linux/version.h
474
475no-dot-config-targets := clean mrproper distclean \
476 cscope gtags TAGS tags help% %docs check% coccicheck \
477 $(version_h) headers_% archheaders archscripts \
478 kernelversion %src-pkg
479
480config-targets := 0
481mixed-targets := 0
482dot-config := 1
483
484ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
485 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
486 dot-config := 0
487 endif
488endif
489
490ifeq ($(KBUILD_EXTMOD),)
491 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
492 config-targets := 1
493 ifneq ($(words $(MAKECMDGOALS)),1)
494 mixed-targets := 1
495 endif
496 endif
497endif
498# install and module_install need also be processed one by one
499ifneq ($(filter install,$(MAKECMDGOALS)),)
500 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
501 mixed-targets := 1
502 endif
503endif
504
505ifeq ($(mixed-targets),1)
506# ===========================================================================
507# We're called with mixed targets (*config and build targets).
508# Handle them one by one.
509
510PHONY += $(MAKECMDGOALS) __build_one_by_one
511
512$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
513 @:
514
515__build_one_by_one:
516 $(Q)set -e; \
517 for i in $(MAKECMDGOALS); do \
518 $(MAKE) -f $(srctree)/Makefile $$i; \
519 done
520
521else
522ifeq ($(config-targets),1)
523# ===========================================================================
524# *config targets only - make sure prerequisites are updated, and descend
525# in scripts/kconfig to make the *config target
526
527# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
528# KBUILD_DEFCONFIG may point out an alternative default configuration
529# used for 'make defconfig'
530include arch/$(SRCARCH)/Makefile
531export KBUILD_DEFCONFIG KBUILD_KCONFIG
532
533config: scripts_basic outputmakefile FORCE
534 $(Q)$(MAKE) $(build)=scripts/kconfig $@
535
536%config: scripts_basic outputmakefile FORCE
537 $(Q)$(MAKE) $(build)=scripts/kconfig $@
538
539else
540# ===========================================================================
541# Build targets only - this includes vmlinux, arch specific targets, clean
542# targets and others. In general all targets except *config targets.
543
544ifeq ($(KBUILD_EXTMOD),)
545# Additional helpers built in scripts/
546# Carefully list dependencies so we do not try to build scripts twice
547# in parallel
548PHONY += scripts
549scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
550 asm-generic
551 $(Q)$(MAKE) $(build)=$(@)
552
553# Objects we will link into vmlinux / subdirs we need to visit
554init-y := init/
555drivers-y := drivers/ sound/ firmware/
556net-y := net/
557libs-y := lib/
558core-y := usr/
559virt-y := virt/
560endif # KBUILD_EXTMOD
561
562ifeq ($(dot-config),1)
563# Read in config
564-include include/config/auto.conf
565
566ifeq ($(KBUILD_EXTMOD),)
567# Read in dependencies to all Kconfig* files, make sure to run
568# oldconfig if changes are detected.
569-include include/config/auto.conf.cmd
570
571# To avoid any implicit rule to kick in, define an empty command
572$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
573
574# If .config is newer than include/config/auto.conf, someone tinkered
575# with it and forgot to run make oldconfig.
576# if auto.conf.cmd is missing then we are probably in a cleaned tree so
577# we execute the config step to be sure to catch updated Kconfig files
578include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
579 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
580else
581# external modules needs include/generated/autoconf.h and include/config/auto.conf
582# but do not care if they are up-to-date. Use auto.conf to trigger the test
583PHONY += include/config/auto.conf
584
585include/config/auto.conf:
586 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
587 echo >&2; \
588 echo >&2 " ERROR: Kernel configuration is invalid."; \
589 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
590 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
591 echo >&2 ; \
592 /bin/false)
593
594endif # KBUILD_EXTMOD
595
596else
597# Dummy target needed, because used as prerequisite
598include/config/auto.conf: ;
599endif # $(dot-config)
600
601# The all: target is the default when no target is given on the
602# command line.
603# This allow a user to issue only 'make' to build a kernel including modules
604# Defaults to vmlinux, but the arch makefile usually adds further targets
605all: vmlinux
606
607# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
608# values of the respective KBUILD_* variables
609ARCH_CPPFLAGS :=
610ARCH_AFLAGS :=
611ARCH_CFLAGS :=
612include arch/$(SRCARCH)/Makefile
613
614KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
615
616ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
618else
619KBUILD_CFLAGS += -O2
620endif
621
622# Tell gcc to never replace conditional load with a non-conditional one
623KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
624
625ifdef CONFIG_READABLE_ASM
626# Disable optimizations that make assembler listings hard to read.
627# reorder blocks reorders the control in the function
628# ipa clone creates specialized cloned functions
629# partial inlining inlines only parts of functions
630KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
631 $(call cc-option,-fno-ipa-cp-clone,) \
632 $(call cc-option,-fno-partial-inlining)
633endif
634
635ifneq ($(CONFIG_FRAME_WARN),0)
636KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
637endif
638
639# Handle stack protector mode.
640#
641# Since kbuild can potentially perform two passes (first with the old
642# .config values and then with updated .config values), we cannot error out
643# if a desired compiler option is unsupported. If we were to error, kbuild
644# could never get to the second pass and actually notice that we changed
645# the option to something that was supported.
646#
647# Additionally, we don't want to fallback and/or silently change which compiler
648# flags will be used, since that leads to producing kernels with different
649# security feature characteristics depending on the compiler used. ("But I
650# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
651#
652# The middle ground is to warn here so that the failed option is obvious, but
653# to let the build fail with bad compiler flags so that we can't produce a
654# kernel when there is a CONFIG and compiler mismatch.
655#
656ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
657 stackp-flag := -fstack-protector
658 ifeq ($(call cc-option, $(stackp-flag)),)
659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
660 -fstack-protector not supported by compiler)
661 endif
662else
663ifdef CONFIG_CC_STACKPROTECTOR_STRONG
664 stackp-flag := -fstack-protector-strong
665 ifeq ($(call cc-option, $(stackp-flag)),)
666 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
667 -fstack-protector-strong not supported by compiler)
668 endif
669else
670 # Force off for distro compilers that enable stack protector by default.
671 stackp-flag := $(call cc-option, -fno-stack-protector)
672endif
673endif
674KBUILD_CFLAGS += $(stackp-flag)
675
676ifeq ($(cc-name),clang)
677KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682# Quiet clang warning: comparison of unsigned expression < 0 is always false
683KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685# source of a reference will be _MergedGlobals and not on of the whitelisted names.
686# See modpost pattern 2
687KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
688KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
689else
690
691# This warning generated too much noise in a regular build.
692# Use make W=1 to enable this warning (see scripts/Makefile.build)
693KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
694endif
695
696ifdef CONFIG_FRAME_POINTER
697KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
698else
699# Some targets (ARM with Thumb2, for example), can't be built with frame
700# pointers. For those, we don't have FUNCTION_TRACER automatically
701# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
702# incompatible with -fomit-frame-pointer with current GCC, so we don't use
703# -fomit-frame-pointer with FUNCTION_TRACER.
704ifndef CONFIG_FUNCTION_TRACER
705KBUILD_CFLAGS += -fomit-frame-pointer
706endif
707endif
708
709KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
710
711ifdef CONFIG_DEBUG_INFO
712ifdef CONFIG_DEBUG_INFO_SPLIT
713KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
714else
715KBUILD_CFLAGS += -g
716endif
717KBUILD_AFLAGS += -Wa,-gdwarf-2
718endif
719ifdef CONFIG_DEBUG_INFO_DWARF4
720KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
721endif
722
723ifdef CONFIG_DEBUG_INFO_REDUCED
724KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
725 $(call cc-option,-fno-var-tracking)
726endif
727
728ifdef CONFIG_FUNCTION_TRACER
729ifndef CC_FLAGS_FTRACE
730CC_FLAGS_FTRACE := -pg
731endif
732export CC_FLAGS_FTRACE
733ifdef CONFIG_HAVE_FENTRY
734CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
735endif
736KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
737KBUILD_AFLAGS += $(CC_USING_FENTRY)
738ifdef CONFIG_DYNAMIC_FTRACE
739 ifdef CONFIG_HAVE_C_RECORDMCOUNT
740 BUILD_C_RECORDMCOUNT := y
741 export BUILD_C_RECORDMCOUNT
742 endif
743endif
744endif
745
746# We trigger additional mismatches with less inlining
747ifdef CONFIG_DEBUG_SECTION_MISMATCH
748KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
749endif
750
751# arch Makefile may override CC so keep this after arch Makefile is included
752NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
753CHECKFLAGS += $(NOSTDINC_FLAGS)
754
755# warn about C99 declaration after statement
756KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
757
758# disable pointer signed / unsigned warnings in gcc 4.0
759KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
760
761# disable invalid "can't wrap" optimizations for signed / pointers
762KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
763
764# conserve stack if available
765KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
766
767# disallow errors like 'EXPORT_GPL(foo);' with missing header
768KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
769
770# require functions to have arguments in prototypes, not empty 'int foo()'
771KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
772
773# Prohibit date/time macros, which would make the build non-deterministic
774KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
775
776# use the deterministic mode of AR if available
777KBUILD_ARFLAGS := $(call ar-option,D)
778
779# check for 'asm goto'
780ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
781 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
782 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
783endif
784
785include scripts/Makefile.kasan
786include scripts/Makefile.extrawarn
787include scripts/Makefile.ubsan
788
789# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
790# last assignments
791KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
792KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
793KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
794
795# Use --build-id when available.
796LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
797 $(call cc-ldoption, -Wl$(comma)--build-id,))
798KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
799LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
800
801ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
802LDFLAGS_vmlinux += $(call ld-option, -X,)
803endif
804
805# Default kernel image to build when no specific target is given.
806# KBUILD_IMAGE may be overruled on the command line or
807# set in the environment
808# Also any assignments in arch/$(ARCH)/Makefile take precedence over
809# this default value
810export KBUILD_IMAGE ?= vmlinux
811
812#
813# INSTALL_PATH specifies where to place the updated kernel and system map
814# images. Default is /boot, but you can set it to other values
815export INSTALL_PATH ?= /boot
816
817#
818# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
819# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
820# an argument if needed. Otherwise it defaults to the kernel install path
821#
822export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
823
824#
825# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
826# relocations required by build roots. This is not defined in the
827# makefile but the argument can be passed to make if needed.
828#
829
830MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
831export MODLIB
832
833#
834# INSTALL_MOD_STRIP, if defined, will cause modules to be
835# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
836# the default option --strip-debug will be used. Otherwise,
837# INSTALL_MOD_STRIP value will be used as the options to the strip command.
838
839ifdef INSTALL_MOD_STRIP
840ifeq ($(INSTALL_MOD_STRIP),1)
841mod_strip_cmd = $(STRIP) --strip-debug
842else
843mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
844endif # INSTALL_MOD_STRIP=1
845else
846mod_strip_cmd = true
847endif # INSTALL_MOD_STRIP
848export mod_strip_cmd
849
850# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
851# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
852# or CONFIG_MODULE_COMPRESS_XZ.
853
854mod_compress_cmd = true
855ifdef CONFIG_MODULE_COMPRESS
856 ifdef CONFIG_MODULE_COMPRESS_GZIP
857 mod_compress_cmd = gzip -n -f
858 endif # CONFIG_MODULE_COMPRESS_GZIP
859 ifdef CONFIG_MODULE_COMPRESS_XZ
860 mod_compress_cmd = xz -f
861 endif # CONFIG_MODULE_COMPRESS_XZ
862endif # CONFIG_MODULE_COMPRESS
863export mod_compress_cmd
864
865# Select initial ramdisk compression format, default is gzip(1).
866# This shall be used by the dracut(8) tool while creating an initramfs image.
867#
868INITRD_COMPRESS-y := gzip
869INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
870INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
871INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
872INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
873INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
874# do not export INITRD_COMPRESS, since we didn't actually
875# choose a sane default compression above.
876# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
877
878ifdef CONFIG_MODULE_SIG_ALL
879$(eval $(call config_filename,MODULE_SIG_KEY))
880
881mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
882else
883mod_sign_cmd = true
884endif
885export mod_sign_cmd
886
887
888ifeq ($(KBUILD_EXTMOD),)
889core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
890
891vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
892 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
893 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
894
895vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
896 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
897
898init-y := $(patsubst %/, %/built-in.o, $(init-y))
899core-y := $(patsubst %/, %/built-in.o, $(core-y))
900drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
901net-y := $(patsubst %/, %/built-in.o, $(net-y))
902libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
903libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
904libs-y := $(libs-y1) $(libs-y2)
905virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
906
907# Externally visible symbols (used by link-vmlinux.sh)
908export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
909export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
910export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
911export LDFLAGS_vmlinux
912# used by scripts/pacmage/Makefile
913export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
914
915vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
916
917# Final link of vmlinux
918 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
919quiet_cmd_link-vmlinux = LINK $@
920
921# Include targets which we want to
922# execute if the rest of the kernel build went well.
923vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
924ifdef CONFIG_HEADERS_CHECK
925 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
926endif
927ifdef CONFIG_SAMPLES
928 $(Q)$(MAKE) $(build)=samples
929endif
930ifdef CONFIG_BUILD_DOCSRC
931 $(Q)$(MAKE) $(build)=Documentation
932endif
933ifdef CONFIG_GDB_SCRIPTS
934 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
935endif
936 +$(call if_changed,link-vmlinux)
937
938# The actual objects are generated when descending,
939# make sure no implicit rule kicks in
940$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
941
942# Handle descending into subdirectories listed in $(vmlinux-dirs)
943# Preset locale variables to speed up the build process. Limit locale
944# tweaks to this spot to avoid wrong language settings when running
945# make menuconfig etc.
946# Error messages still appears in the original language
947
948PHONY += $(vmlinux-dirs)
949$(vmlinux-dirs): prepare scripts
950 $(Q)$(MAKE) $(build)=$@
951
952define filechk_kernel.release
953 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
954endef
955
956# Store (new) KERNELRELEASE string in include/config/kernel.release
957include/config/kernel.release: include/config/auto.conf FORCE
958 $(call filechk,kernel.release)
959
960
961# Things we need to do before we recursively start building the kernel
962# or the modules are listed in "prepare".
963# A multi level approach is used. prepareN is processed before prepareN-1.
964# archprepare is used in arch Makefiles and when processed asm symlink,
965# version.h and scripts_basic is processed / created.
966
967# Listed in dependency order
968PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
969
970# prepare3 is used to check if we are building in a separate output directory,
971# and if so do:
972# 1) Check that make has not been executed in the kernel src $(srctree)
973prepare3: include/config/kernel.release
974ifneq ($(KBUILD_SRC),)
975 @$(kecho) ' Using $(srctree) as source for kernel'
976 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
977 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
978 echo >&2 " in the '$(srctree)' directory.";\
979 /bin/false; \
980 fi;
981endif
982
983# prepare2 creates a makefile if using a separate output directory
984prepare2: prepare3 outputmakefile asm-generic
985
986prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
987 include/config/auto.conf
988 $(cmd_crmodverdir)
989
990archprepare: archheaders archscripts prepare1 scripts_basic
991
992prepare0: archprepare FORCE
993 $(Q)$(MAKE) $(build)=.
994
995# All the preparing..
996prepare: prepare0
997
998# Generate some files
999# ---------------------------------------------------------------------------
1000
1001# KERNELRELEASE can change from a few different places, meaning version.h
1002# needs to be updated, so this check is forced on all builds
1003
1004uts_len := 64
1005define filechk_utsrelease.h
1006 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1007 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1008 exit 1; \
1009 fi; \
1010 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1011endef
1012
1013define filechk_version.h
1014 (echo \#define LINUX_VERSION_CODE $(shell \
1015 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1016 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1017endef
1018
1019$(version_h): $(srctree)/Makefile FORCE
1020 $(call filechk,version.h)
1021 $(Q)rm -f $(old_version_h)
1022
1023include/generated/utsrelease.h: include/config/kernel.release FORCE
1024 $(call filechk,utsrelease.h)
1025
1026PHONY += headerdep
1027headerdep:
1028 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1029 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1030
1031# ---------------------------------------------------------------------------
1032# Firmware install
1033INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1034export INSTALL_FW_PATH
1035
1036PHONY += firmware_install
1037firmware_install: FORCE
1038 @mkdir -p $(objtree)/firmware
1039 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1040
1041# ---------------------------------------------------------------------------
1042# Kernel headers
1043
1044#Default location for installed headers
1045export INSTALL_HDR_PATH = $(objtree)/usr
1046
1047# If we do an all arch process set dst to asm-$(hdr-arch)
1048hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050PHONY += archheaders
1051archheaders:
1052
1053PHONY += archscripts
1054archscripts:
1055
1056PHONY += __headers
1057__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1058 $(Q)$(MAKE) $(build)=scripts build_unifdef
1059
1060PHONY += headers_install_all
1061headers_install_all:
1062 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1063
1064PHONY += headers_install
1065headers_install: __headers
1066 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1067 $(error Headers not exportable for the $(SRCARCH) architecture))
1068 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1069 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1070
1071PHONY += headers_check_all
1072headers_check_all: headers_install_all
1073 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1074
1075PHONY += headers_check
1076headers_check: headers_install
1077 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1078 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1079
1080# ---------------------------------------------------------------------------
1081# Kernel selftest
1082
1083PHONY += kselftest
1084kselftest:
1085 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1086
1087kselftest-clean:
1088 $(Q)$(MAKE) -C tools/testing/selftests clean
1089
1090# ---------------------------------------------------------------------------
1091# Modules
1092
1093ifdef CONFIG_MODULES
1094
1095# By default, build modules as well
1096
1097all: modules
1098
1099# Build modules
1100#
1101# A module can be listed more than once in obj-m resulting in
1102# duplicate lines in modules.order files. Those are removed
1103# using awk while concatenating to the final file.
1104
1105PHONY += modules
1106modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1107 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1108 @$(kecho) ' Building modules, stage 2.';
1109 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1110 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1111
1112modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1113 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1114
1115%/modules.builtin: include/config/auto.conf
1116 $(Q)$(MAKE) $(modbuiltin)=$*
1117
1118
1119# Target to prepare building external modules
1120PHONY += modules_prepare
1121modules_prepare: prepare scripts
1122
1123# Target to install modules
1124PHONY += modules_install
1125modules_install: _modinst_ _modinst_post
1126
1127PHONY += _modinst_
1128_modinst_:
1129 @rm -rf $(MODLIB)/kernel
1130 @rm -f $(MODLIB)/source
1131 @mkdir -p $(MODLIB)/kernel
1132 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1133 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1134 rm -f $(MODLIB)/build ; \
1135 ln -s $(CURDIR) $(MODLIB)/build ; \
1136 fi
1137 @cp -f $(objtree)/modules.order $(MODLIB)/
1138 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1140
1141# This depmod is only for convenience to give the initial
1142# boot a modules.dep even before / is mounted read-write. However the
1143# boot script depmod is the master version.
1144PHONY += _modinst_post
1145_modinst_post: _modinst_
1146 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1147 $(call cmd,depmod)
1148
1149ifeq ($(CONFIG_MODULE_SIG), y)
1150PHONY += modules_sign
1151modules_sign:
1152 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1153endif
1154
1155else # CONFIG_MODULES
1156
1157# Modules not configured
1158# ---------------------------------------------------------------------------
1159
1160modules modules_install: FORCE
1161 @echo >&2
1162 @echo >&2 "The present kernel configuration has modules disabled."
1163 @echo >&2 "Type 'make config' and enable loadable module support."
1164 @echo >&2 "Then build a kernel with module support enabled."
1165 @echo >&2
1166 @exit 1
1167
1168endif # CONFIG_MODULES
1169
1170###
1171# Cleaning is done on three levels.
1172# make clean Delete most generated files
1173# Leave enough to build external modules
1174# make mrproper Delete the current configuration, and all generated files
1175# make distclean Remove editor backup files, patch leftover files and the like
1176
1177# Directories & files removed with 'make clean'
1178CLEAN_DIRS += $(MODVERDIR)
1179
1180# Directories & files removed with 'make mrproper'
1181MRPROPER_DIRS += include/config usr/include include/generated \
1182 arch/*/include/generated .tmp_objdiff
1183MRPROPER_FILES += .config .config.old .version .old_version \
1184 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1185 signing_key.pem signing_key.priv signing_key.x509 \
1186 x509.genkey extra_certificates signing_key.x509.keyid \
1187 signing_key.x509.signer vmlinux-gdb.py
1188
1189# clean - Delete most, but leave enough to build external modules
1190#
1191clean: rm-dirs := $(CLEAN_DIRS)
1192clean: rm-files := $(CLEAN_FILES)
1193clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1194
1195PHONY += $(clean-dirs) clean archclean vmlinuxclean
1196$(clean-dirs):
1197 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1198
1199vmlinuxclean:
1200 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1201
1202clean: archclean vmlinuxclean
1203
1204# mrproper - Delete all generated files, including .config
1205#
1206mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1207mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1208mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1209
1210PHONY += $(mrproper-dirs) mrproper archmrproper
1211$(mrproper-dirs):
1212 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1213
1214mrproper: clean archmrproper $(mrproper-dirs)
1215 $(call cmd,rmdirs)
1216 $(call cmd,rmfiles)
1217
1218# distclean
1219#
1220PHONY += distclean
1221
1222distclean: mrproper
1223 @find $(srctree) $(RCS_FIND_IGNORE) \
1224 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1225 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1226 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1227 -type f -print | xargs rm -f
1228
1229
1230# Packaging of the kernel to various formats
1231# ---------------------------------------------------------------------------
1232# rpm target kept for backward compatibility
1233package-dir := scripts/package
1234
1235%src-pkg: FORCE
1236 $(Q)$(MAKE) $(build)=$(package-dir) $@
1237%pkg: include/config/kernel.release FORCE
1238 $(Q)$(MAKE) $(build)=$(package-dir) $@
1239rpm: include/config/kernel.release FORCE
1240 $(Q)$(MAKE) $(build)=$(package-dir) $@
1241
1242
1243# Brief documentation of the typical targets used
1244# ---------------------------------------------------------------------------
1245
1246boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1247boards := $(sort $(notdir $(boards)))
1248board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1249board-dirs := $(sort $(notdir $(board-dirs:/=)))
1250
1251help:
1252 @echo 'Cleaning targets:'
1253 @echo ' clean - Remove most generated files but keep the config and'
1254 @echo ' enough build support to build external modules'
1255 @echo ' mrproper - Remove all generated files + config + various backup files'
1256 @echo ' distclean - mrproper + remove editor backup and patch files'
1257 @echo ''
1258 @echo 'Configuration targets:'
1259 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1260 @echo ''
1261 @echo 'Other generic targets:'
1262 @echo ' all - Build all targets marked with [*]'
1263 @echo '* vmlinux - Build the bare kernel'
1264 @echo '* modules - Build all modules'
1265 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1266 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1267 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1268 @echo ' dir/ - Build all files in dir and below'
1269 @echo ' dir/file.[ois] - Build specified target only'
1270 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1271 @echo ' (requires a recent binutils and recent build (System.map))'
1272 @echo ' dir/file.ko - Build module including final link'
1273 @echo ' modules_prepare - Set up for building external modules'
1274 @echo ' tags/TAGS - Generate tags file for editors'
1275 @echo ' cscope - Generate cscope index'
1276 @echo ' gtags - Generate GNU GLOBAL index'
1277 @echo ' kernelrelease - Output the release version string (use with make -s)'
1278 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1279 @echo ' image_name - Output the image name (use with make -s)'
1280 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1281 echo ' (default: $(INSTALL_HDR_PATH))'; \
1282 echo ''
1283 @echo 'Static analysers'
1284 @echo ' checkstack - Generate a list of stack hogs'
1285 @echo ' namespacecheck - Name space analysis on compiled kernel'
1286 @echo ' versioncheck - Sanity check on version.h usage'
1287 @echo ' includecheck - Check for duplicate included header files'
1288 @echo ' export_report - List the usages of all exported symbols'
1289 @echo ' headers_check - Sanity check on exported headers'
1290 @echo ' headerdep - Detect inclusion cycles in headers'
1291 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1292 @echo ''
1293 @echo 'Kernel selftest'
1294 @echo ' kselftest - Build and run kernel selftest (run as root)'
1295 @echo ' Build, install, and boot kernel before'
1296 @echo ' running kselftest on it'
1297 @echo ' kselftest-clean - Remove all generated kselftest files'
1298 @echo ''
1299 @echo 'Kernel packaging:'
1300 @$(MAKE) $(build)=$(package-dir) help
1301 @echo ''
1302 @echo 'Documentation targets:'
1303 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1304 @echo ''
1305 @echo 'Architecture specific targets ($(SRCARCH)):'
1306 @$(if $(archhelp),$(archhelp),\
1307 echo ' No architecture specific help defined for $(SRCARCH)')
1308 @echo ''
1309 @$(if $(boards), \
1310 $(foreach b, $(boards), \
1311 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1312 echo '')
1313 @$(if $(board-dirs), \
1314 $(foreach b, $(board-dirs), \
1315 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1316 printf " %-16s - Show all of the above\\n" help-boards; \
1317 echo '')
1318
1319 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1320 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1321 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1322 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1323 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1324 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1325 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1326 @echo ' 1: warnings which may be relevant and do not occur too often'
1327 @echo ' 2: warnings which occur quite often but may still be relevant'
1328 @echo ' 3: more obscure warnings, can most likely be ignored'
1329 @echo ' Multiple levels can be combined with W=12 or W=123'
1330 @echo ''
1331 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1332 @echo 'For further info see the ./README file'
1333
1334
1335help-board-dirs := $(addprefix help-,$(board-dirs))
1336
1337help-boards: $(help-board-dirs)
1338
1339boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1340
1341$(help-board-dirs): help-%:
1342 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1343 @$(if $(boards-per-dir), \
1344 $(foreach b, $(boards-per-dir), \
1345 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1346 echo '')
1347
1348
1349# Documentation targets
1350# ---------------------------------------------------------------------------
1351%docs: scripts_basic FORCE
1352 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1353 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1354
1355else # KBUILD_EXTMOD
1356
1357###
1358# External module support.
1359# When building external modules the kernel used as basis is considered
1360# read-only, and no consistency checks are made and the make
1361# system is not used on the basis kernel. If updates are required
1362# in the basis kernel ordinary make commands (without M=...) must
1363# be used.
1364#
1365# The following are the only valid targets when building external
1366# modules.
1367# make M=dir clean Delete all automatically generated files
1368# make M=dir modules Make all modules in specified dir
1369# make M=dir Same as 'make M=dir modules'
1370# make M=dir modules_install
1371# Install the modules built in the module directory
1372# Assumes install directory is already created
1373
1374# We are always building modules
1375KBUILD_MODULES := 1
1376PHONY += crmodverdir
1377crmodverdir:
1378 $(cmd_crmodverdir)
1379
1380PHONY += $(objtree)/Module.symvers
1381$(objtree)/Module.symvers:
1382 @test -e $(objtree)/Module.symvers || ( \
1383 echo; \
1384 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1385 echo " is missing; modules will have no dependencies and modversions."; \
1386 echo )
1387
1388module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1389PHONY += $(module-dirs) modules
1390$(module-dirs): crmodverdir $(objtree)/Module.symvers
1391 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1392
1393modules: $(module-dirs)
1394 @$(kecho) ' Building modules, stage 2.';
1395 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1396
1397PHONY += modules_install
1398modules_install: _emodinst_ _emodinst_post
1399
1400install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1401PHONY += _emodinst_
1402_emodinst_:
1403 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1404 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1405
1406PHONY += _emodinst_post
1407_emodinst_post: _emodinst_
1408 $(call cmd,depmod)
1409
1410clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1411
1412PHONY += $(clean-dirs) clean
1413$(clean-dirs):
1414 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1415
1416clean: rm-dirs := $(MODVERDIR)
1417clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1418
1419help:
1420 @echo ' Building external modules.'
1421 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1422 @echo ''
1423 @echo ' modules - default target, build the module(s)'
1424 @echo ' modules_install - install the module'
1425 @echo ' clean - remove generated files in module directory only'
1426 @echo ''
1427
1428# Dummies...
1429PHONY += prepare scripts
1430prepare: ;
1431scripts: ;
1432endif # KBUILD_EXTMOD
1433
1434clean: $(clean-dirs)
1435 $(call cmd,rmdirs)
1436 $(call cmd,rmfiles)
1437 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1438 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1439 -o -name '*.ko.*' \
1440 -o -name '*.dwo' \
1441 -o -name '*.su' \
1442 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1443 -o -name '*.symtypes' -o -name 'modules.order' \
1444 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1445 -o -name '*.gcno' \) -type f -print | xargs rm -f
1446
1447# Generate tags for editors
1448# ---------------------------------------------------------------------------
1449quiet_cmd_tags = GEN $@
1450 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1451
1452tags TAGS cscope gtags: FORCE
1453 $(call cmd,tags)
1454
1455# Scripts to check various things for consistency
1456# ---------------------------------------------------------------------------
1457
1458PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1459
1460includecheck:
1461 find $(srctree)/* $(RCS_FIND_IGNORE) \
1462 -name '*.[hcS]' -type f -print | sort \
1463 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1464
1465versioncheck:
1466 find $(srctree)/* $(RCS_FIND_IGNORE) \
1467 -name '*.[hcS]' -type f -print | sort \
1468 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1469
1470coccicheck:
1471 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1472
1473namespacecheck:
1474 $(PERL) $(srctree)/scripts/namespace.pl
1475
1476export_report:
1477 $(PERL) $(srctree)/scripts/export_report.pl
1478
1479endif #ifeq ($(config-targets),1)
1480endif #ifeq ($(mixed-targets),1)
1481
1482PHONY += checkstack kernelrelease kernelversion image_name
1483
1484# UML needs a little special treatment here. It wants to use the host
1485# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1486# else wants $(ARCH), including people doing cross-builds, which means
1487# that $(SUBARCH) doesn't work here.
1488ifeq ($(ARCH), um)
1489CHECKSTACK_ARCH := $(SUBARCH)
1490else
1491CHECKSTACK_ARCH := $(ARCH)
1492endif
1493checkstack:
1494 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1495 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1496
1497kernelrelease:
1498 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1499
1500kernelversion:
1501 @echo $(KERNELVERSION)
1502
1503image_name:
1504 @echo $(KBUILD_IMAGE)
1505
1506# Clear a bunch of variables before executing the submake
1507tools/: FORCE
1508 $(Q)mkdir -p $(objtree)/tools
1509 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1510
1511tools/%: FORCE
1512 $(Q)mkdir -p $(objtree)/tools
1513 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1514
1515# Single targets
1516# ---------------------------------------------------------------------------
1517# Single targets are compatible with:
1518# - build with mixed source and output
1519# - build with separate output dir 'make O=...'
1520# - external modules
1521#
1522# target-dir => where to store outputfile
1523# build-dir => directory in kernel source tree to use
1524
1525ifeq ($(KBUILD_EXTMOD),)
1526 build-dir = $(patsubst %/,%,$(dir $@))
1527 target-dir = $(dir $@)
1528else
1529 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1530 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1531 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1532endif
1533
1534%.s: %.c prepare scripts FORCE
1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536%.i: %.c prepare scripts FORCE
1537 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538%.o: %.c prepare scripts FORCE
1539 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1540%.lst: %.c prepare scripts FORCE
1541 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1542%.s: %.S prepare scripts FORCE
1543 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1544%.o: %.S prepare scripts FORCE
1545 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1546%.symtypes: %.c prepare scripts FORCE
1547 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1548
1549# Modules
1550/: prepare scripts FORCE
1551 $(cmd_crmodverdir)
1552 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1553 $(build)=$(build-dir)
1554# Make sure the latest headers are built for Documentation
1555Documentation/: headers_install
1556%/: prepare scripts FORCE
1557 $(cmd_crmodverdir)
1558 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1559 $(build)=$(build-dir)
1560%.ko: prepare scripts FORCE
1561 $(cmd_crmodverdir)
1562 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1563 $(build)=$(build-dir) $(@:.ko=.o)
1564 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1565
1566# FIXME Should go into a make.lib or something
1567# ===========================================================================
1568
1569quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1570 cmd_rmdirs = rm -rf $(rm-dirs)
1571
1572quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1573 cmd_rmfiles = rm -f $(rm-files)
1574
1575# Run depmod only if we have System.map and depmod is executable
1576quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1577 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1578 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1579
1580# Create temporary dir for module support files
1581# clean it up only when building all modules
1582cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1583 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1584
1585# read all saved command lines
1586
1587targets := $(wildcard $(sort $(targets)))
1588cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1589
1590ifneq ($(cmd_files),)
1591 $(cmd_files): ; # Do not try to update included dependency files
1592 include $(cmd_files)
1593endif
1594
1595endif # skip-makefile
1596
1597PHONY += FORCE
1598FORCE:
1599
1600# Declare the contents of the .PHONY variable as phony. We keep that
1601# information in a variable so we can use it in if_changed and friends.
1602.PHONY: $(PHONY)