projects/linux·blob 6a13feb9 · refs

1589 lines · 53.2 KiB

1VERSION = 4
2PATCHLEVEL = 3
3SUBLEVEL = 0
4EXTRAVERSION =
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
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 $(MAKECMDGOALS)),1)
494 mixed-targets := 1
495 endif
496 endif
497endif
498
499ifeq ($(mixed-targets),1)
500# ===========================================================================
501# We're called with mixed targets (*config and build targets).
502# Handle them one by one.
503
504PHONY += $(MAKECMDGOALS) __build_one_by_one
505
506$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
507 @:
508
509__build_one_by_one:
510 $(Q)set -e; \
511 for i in $(MAKECMDGOALS); do \
512 $(MAKE) -f $(srctree)/Makefile $$i; \
513 done
514
515else
516ifeq ($(config-targets),1)
517# ===========================================================================
518# *config targets only - make sure prerequisites are updated, and descend
519# in scripts/kconfig to make the *config target
520
521# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
522# KBUILD_DEFCONFIG may point out an alternative default configuration
523# used for 'make defconfig'
524include arch/$(SRCARCH)/Makefile
525export KBUILD_DEFCONFIG KBUILD_KCONFIG
526
527config: scripts_basic outputmakefile FORCE
528 $(Q)$(MAKE) $(build)=scripts/kconfig $@
529
530%config: scripts_basic outputmakefile FORCE
531 $(Q)$(MAKE) $(build)=scripts/kconfig $@
532
533else
534# ===========================================================================
535# Build targets only - this includes vmlinux, arch specific targets, clean
536# targets and others. In general all targets except *config targets.
537
538ifeq ($(KBUILD_EXTMOD),)
539# Additional helpers built in scripts/
540# Carefully list dependencies so we do not try to build scripts twice
541# in parallel
542PHONY += scripts
543scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
544 asm-generic
545 $(Q)$(MAKE) $(build)=$(@)
546
547# Objects we will link into vmlinux / subdirs we need to visit
548init-y := init/
549drivers-y := drivers/ sound/ firmware/
550net-y := net/
551libs-y := lib/
552core-y := usr/
553endif # KBUILD_EXTMOD
554
555ifeq ($(dot-config),1)
556# Read in config
557-include include/config/auto.conf
558
559ifeq ($(KBUILD_EXTMOD),)
560# Read in dependencies to all Kconfig* files, make sure to run
561# oldconfig if changes are detected.
562-include include/config/auto.conf.cmd
563
564# To avoid any implicit rule to kick in, define an empty command
565$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
566
567# If .config is newer than include/config/auto.conf, someone tinkered
568# with it and forgot to run make oldconfig.
569# if auto.conf.cmd is missing then we are probably in a cleaned tree so
570# we execute the config step to be sure to catch updated Kconfig files
571include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
572 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
573else
574# external modules needs include/generated/autoconf.h and include/config/auto.conf
575# but do not care if they are up-to-date. Use auto.conf to trigger the test
576PHONY += include/config/auto.conf
577
578include/config/auto.conf:
579 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
580 echo >&2; \
581 echo >&2 " ERROR: Kernel configuration is invalid."; \
582 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
583 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
584 echo >&2 ; \
585 /bin/false)
586
587endif # KBUILD_EXTMOD
588
589else
590# Dummy target needed, because used as prerequisite
591include/config/auto.conf: ;
592endif # $(dot-config)
593
594# The all: target is the default when no target is given on the
595# command line.
596# This allow a user to issue only 'make' to build a kernel including modules
597# Defaults to vmlinux, but the arch makefile usually adds further targets
598all: vmlinux
599
600# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
601# values of the respective KBUILD_* variables
602ARCH_CPPFLAGS :=
603ARCH_AFLAGS :=
604ARCH_CFLAGS :=
605include arch/$(SRCARCH)/Makefile
606
607KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
608
609ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
610KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
611else
612KBUILD_CFLAGS += -O2
613endif
614
615# Tell gcc to never replace conditional load with a non-conditional one
616KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
617
618ifdef CONFIG_READABLE_ASM
619# Disable optimizations that make assembler listings hard to read.
620# reorder blocks reorders the control in the function
621# ipa clone creates specialized cloned functions
622# partial inlining inlines only parts of functions
623KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
624 $(call cc-option,-fno-ipa-cp-clone,) \
625 $(call cc-option,-fno-partial-inlining)
626endif
627
628ifneq ($(CONFIG_FRAME_WARN),0)
629KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
630endif
631
632# Handle stack protector mode.
633#
634# Since kbuild can potentially perform two passes (first with the old
635# .config values and then with updated .config values), we cannot error out
636# if a desired compiler option is unsupported. If we were to error, kbuild
637# could never get to the second pass and actually notice that we changed
638# the option to something that was supported.
639#
640# Additionally, we don't want to fallback and/or silently change which compiler
641# flags will be used, since that leads to producing kernels with different
642# security feature characteristics depending on the compiler used. ("But I
643# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
644#
645# The middle ground is to warn here so that the failed option is obvious, but
646# to let the build fail with bad compiler flags so that we can't produce a
647# kernel when there is a CONFIG and compiler mismatch.
648#
649ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
650 stackp-flag := -fstack-protector
651 ifeq ($(call cc-option, $(stackp-flag)),)
652 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
653 -fstack-protector not supported by compiler)
654 endif
655else
656ifdef CONFIG_CC_STACKPROTECTOR_STRONG
657 stackp-flag := -fstack-protector-strong
658 ifeq ($(call cc-option, $(stackp-flag)),)
659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
660 -fstack-protector-strong not supported by compiler)
661 endif
662else
663 # Force off for distro compilers that enable stack protector by default.
664 stackp-flag := $(call cc-option, -fno-stack-protector)
665endif
666endif
667KBUILD_CFLAGS += $(stackp-flag)
668
669ifeq ($(cc-name),clang)
670KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
671KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
672KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
673KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
674KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
675# Quiet clang warning: comparison of unsigned expression < 0 is always false
676KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
677# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
678# source of a reference will be _MergedGlobals and not on of the whitelisted names.
679# See modpost pattern 2
680KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
681KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
682else
683
684# This warning generated too much noise in a regular build.
685# Use make W=1 to enable this warning (see scripts/Makefile.build)
686KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
687endif
688
689ifdef CONFIG_FRAME_POINTER
690KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
691else
692# Some targets (ARM with Thumb2, for example), can't be built with frame
693# pointers. For those, we don't have FUNCTION_TRACER automatically
694# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
695# incompatible with -fomit-frame-pointer with current GCC, so we don't use
696# -fomit-frame-pointer with FUNCTION_TRACER.
697ifndef CONFIG_FUNCTION_TRACER
698KBUILD_CFLAGS += -fomit-frame-pointer
699endif
700endif
701
702KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
703
704ifdef CONFIG_DEBUG_INFO
705ifdef CONFIG_DEBUG_INFO_SPLIT
706KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
707else
708KBUILD_CFLAGS += -g
709endif
710KBUILD_AFLAGS += -Wa,-gdwarf-2
711endif
712ifdef CONFIG_DEBUG_INFO_DWARF4
713KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
714endif
715
716ifdef CONFIG_DEBUG_INFO_REDUCED
717KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
718 $(call cc-option,-fno-var-tracking)
719endif
720
721ifdef CONFIG_FUNCTION_TRACER
722ifndef CC_FLAGS_FTRACE
723CC_FLAGS_FTRACE := -pg
724endif
725export CC_FLAGS_FTRACE
726ifdef CONFIG_HAVE_FENTRY
727CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
728endif
729KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
730KBUILD_AFLAGS += $(CC_USING_FENTRY)
731ifdef CONFIG_DYNAMIC_FTRACE
732 ifdef CONFIG_HAVE_C_RECORDMCOUNT
733 BUILD_C_RECORDMCOUNT := y
734 export BUILD_C_RECORDMCOUNT
735 endif
736endif
737endif
738
739# We trigger additional mismatches with less inlining
740ifdef CONFIG_DEBUG_SECTION_MISMATCH
741KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
742endif
743
744# arch Makefile may override CC so keep this after arch Makefile is included
745NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
746CHECKFLAGS += $(NOSTDINC_FLAGS)
747
748# warn about C99 declaration after statement
749KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
750
751# disable pointer signed / unsigned warnings in gcc 4.0
752KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
753
754# disable invalid "can't wrap" optimizations for signed / pointers
755KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
756
757# conserve stack if available
758KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
759
760# disallow errors like 'EXPORT_GPL(foo);' with missing header
761KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
762
763# require functions to have arguments in prototypes, not empty 'int foo()'
764KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
765
766# Prohibit date/time macros, which would make the build non-deterministic
767KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
768
769# use the deterministic mode of AR if available
770KBUILD_ARFLAGS := $(call ar-option,D)
771
772# check for 'asm goto'
773ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
774 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
775 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
776endif
777
778include scripts/Makefile.kasan
779include scripts/Makefile.extrawarn
780
781# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
782# last assignments
783KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
784KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
785KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
786
787# Use --build-id when available.
788LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
789 $(call cc-ldoption, -Wl$(comma)--build-id,))
790KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
791LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
792
793ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
794LDFLAGS_vmlinux += $(call ld-option, -X,)
795endif
796
797# Default kernel image to build when no specific target is given.
798# KBUILD_IMAGE may be overruled on the command line or
799# set in the environment
800# Also any assignments in arch/$(ARCH)/Makefile take precedence over
801# this default value
802export KBUILD_IMAGE ?= vmlinux
803
804#
805# INSTALL_PATH specifies where to place the updated kernel and system map
806# images. Default is /boot, but you can set it to other values
807export INSTALL_PATH ?= /boot
808
809#
810# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
811# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
812# an argument if needed. Otherwise it defaults to the kernel install path
813#
814export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
815
816#
817# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
818# relocations required by build roots. This is not defined in the
819# makefile but the argument can be passed to make if needed.
820#
821
822MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
823export MODLIB
824
825#
826# INSTALL_MOD_STRIP, if defined, will cause modules to be
827# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
828# the default option --strip-debug will be used. Otherwise,
829# INSTALL_MOD_STRIP value will be used as the options to the strip command.
830
831ifdef INSTALL_MOD_STRIP
832ifeq ($(INSTALL_MOD_STRIP),1)
833mod_strip_cmd = $(STRIP) --strip-debug
834else
835mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
836endif # INSTALL_MOD_STRIP=1
837else
838mod_strip_cmd = true
839endif # INSTALL_MOD_STRIP
840export mod_strip_cmd
841
842# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
843# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
844# or CONFIG_MODULE_COMPRESS_XZ.
845
846mod_compress_cmd = true
847ifdef CONFIG_MODULE_COMPRESS
848 ifdef CONFIG_MODULE_COMPRESS_GZIP
849 mod_compress_cmd = gzip -n -f
850 endif # CONFIG_MODULE_COMPRESS_GZIP
851 ifdef CONFIG_MODULE_COMPRESS_XZ
852 mod_compress_cmd = xz -f
853 endif # CONFIG_MODULE_COMPRESS_XZ
854endif # CONFIG_MODULE_COMPRESS
855export mod_compress_cmd
856
857# Select initial ramdisk compression format, default is gzip(1).
858# This shall be used by the dracut(8) tool while creating an initramfs image.
859#
860INITRD_COMPRESS-y := gzip
861INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
862INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
863INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
864INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
865INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
866# do not export INITRD_COMPRESS, since we didn't actually
867# choose a sane default compression above.
868# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
869
870ifdef CONFIG_MODULE_SIG_ALL
871$(eval $(call config_filename,MODULE_SIG_KEY))
872
873mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
874else
875mod_sign_cmd = true
876endif
877export mod_sign_cmd
878
879
880ifeq ($(KBUILD_EXTMOD),)
881core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
882
883vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
884 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
885 $(net-y) $(net-m) $(libs-y) $(libs-m)))
886
887vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
888 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
889
890init-y := $(patsubst %/, %/built-in.o, $(init-y))
891core-y := $(patsubst %/, %/built-in.o, $(core-y))
892drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
893net-y := $(patsubst %/, %/built-in.o, $(net-y))
894libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
895libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
896libs-y := $(libs-y1) $(libs-y2)
897
898# Externally visible symbols (used by link-vmlinux.sh)
899export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
900export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
901export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
902export LDFLAGS_vmlinux
903# used by scripts/pacmage/Makefile
904export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
905
906vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
907
908# Final link of vmlinux
909 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
910quiet_cmd_link-vmlinux = LINK $@
911
912# Include targets which we want to
913# execute if the rest of the kernel build went well.
914vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
915ifdef CONFIG_HEADERS_CHECK
916 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
917endif
918ifdef CONFIG_SAMPLES
919 $(Q)$(MAKE) $(build)=samples
920endif
921ifdef CONFIG_BUILD_DOCSRC
922 $(Q)$(MAKE) $(build)=Documentation
923endif
924ifdef CONFIG_GDB_SCRIPTS
925 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
926endif
927 +$(call if_changed,link-vmlinux)
928
929# The actual objects are generated when descending,
930# make sure no implicit rule kicks in
931$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
932
933# Handle descending into subdirectories listed in $(vmlinux-dirs)
934# Preset locale variables to speed up the build process. Limit locale
935# tweaks to this spot to avoid wrong language settings when running
936# make menuconfig etc.
937# Error messages still appears in the original language
938
939PHONY += $(vmlinux-dirs)
940$(vmlinux-dirs): prepare scripts
941 $(Q)$(MAKE) $(build)=$@
942
943define filechk_kernel.release
944 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
945endef
946
947# Store (new) KERNELRELEASE string in include/config/kernel.release
948include/config/kernel.release: include/config/auto.conf FORCE
949 $(call filechk,kernel.release)
950
951
952# Things we need to do before we recursively start building the kernel
953# or the modules are listed in "prepare".
954# A multi level approach is used. prepareN is processed before prepareN-1.
955# archprepare is used in arch Makefiles and when processed asm symlink,
956# version.h and scripts_basic is processed / created.
957
958# Listed in dependency order
959PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
960
961# prepare3 is used to check if we are building in a separate output directory,
962# and if so do:
963# 1) Check that make has not been executed in the kernel src $(srctree)
964prepare3: include/config/kernel.release
965ifneq ($(KBUILD_SRC),)
966 @$(kecho) ' Using $(srctree) as source for kernel'
967 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
968 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
969 echo >&2 " in the '$(srctree)' directory.";\
970 /bin/false; \
971 fi;
972endif
973
974# prepare2 creates a makefile if using a separate output directory
975prepare2: prepare3 outputmakefile asm-generic
976
977prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
978 include/config/auto.conf
979 $(cmd_crmodverdir)
980
981archprepare: archheaders archscripts prepare1 scripts_basic
982
983prepare0: archprepare FORCE
984 $(Q)$(MAKE) $(build)=.
985
986# All the preparing..
987prepare: prepare0
988
989# Generate some files
990# ---------------------------------------------------------------------------
991
992# KERNELRELEASE can change from a few different places, meaning version.h
993# needs to be updated, so this check is forced on all builds
994
995uts_len := 64
996define filechk_utsrelease.h
997 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
998 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
999 exit 1; \
1000 fi; \
1001 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1002endef
1003
1004define filechk_version.h
1005 (echo \#define LINUX_VERSION_CODE $(shell \
1006 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1007 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1008endef
1009
1010$(version_h): $(srctree)/Makefile FORCE
1011 $(call filechk,version.h)
1012 $(Q)rm -f $(old_version_h)
1013
1014include/generated/utsrelease.h: include/config/kernel.release FORCE
1015 $(call filechk,utsrelease.h)
1016
1017PHONY += headerdep
1018headerdep:
1019 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1020 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1021
1022# ---------------------------------------------------------------------------
1023# Firmware install
1024INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1025export INSTALL_FW_PATH
1026
1027PHONY += firmware_install
1028firmware_install: FORCE
1029 @mkdir -p $(objtree)/firmware
1030 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1031
1032# ---------------------------------------------------------------------------
1033# Kernel headers
1034
1035#Default location for installed headers
1036export INSTALL_HDR_PATH = $(objtree)/usr
1037
1038# If we do an all arch process set dst to asm-$(hdr-arch)
1039hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1040
1041PHONY += archheaders
1042archheaders:
1043
1044PHONY += archscripts
1045archscripts:
1046
1047PHONY += __headers
1048__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1049 $(Q)$(MAKE) $(build)=scripts build_unifdef
1050
1051PHONY += headers_install_all
1052headers_install_all:
1053 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1054
1055PHONY += headers_install
1056headers_install: __headers
1057 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1058 $(error Headers not exportable for the $(SRCARCH) architecture))
1059 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1060 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1061
1062PHONY += headers_check_all
1063headers_check_all: headers_install_all
1064 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1065
1066PHONY += headers_check
1067headers_check: headers_install
1068 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1069 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1070
1071# ---------------------------------------------------------------------------
1072# Kernel selftest
1073
1074PHONY += kselftest
1075kselftest:
1076 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1077
1078# ---------------------------------------------------------------------------
1079# Modules
1080
1081ifdef CONFIG_MODULES
1082
1083# By default, build modules as well
1084
1085all: modules
1086
1087# Build modules
1088#
1089# A module can be listed more than once in obj-m resulting in
1090# duplicate lines in modules.order files. Those are removed
1091# using awk while concatenating to the final file.
1092
1093PHONY += modules
1094modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1095 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1096 @$(kecho) ' Building modules, stage 2.';
1097 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1098 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1099
1100modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1101 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1102
1103%/modules.builtin: include/config/auto.conf
1104 $(Q)$(MAKE) $(modbuiltin)=$*
1105
1106
1107# Target to prepare building external modules
1108PHONY += modules_prepare
1109modules_prepare: prepare scripts
1110
1111# Target to install modules
1112PHONY += modules_install
1113modules_install: _modinst_ _modinst_post
1114
1115PHONY += _modinst_
1116_modinst_:
1117 @rm -rf $(MODLIB)/kernel
1118 @rm -f $(MODLIB)/source
1119 @mkdir -p $(MODLIB)/kernel
1120 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1121 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1122 rm -f $(MODLIB)/build ; \
1123 ln -s $(CURDIR) $(MODLIB)/build ; \
1124 fi
1125 @cp -f $(objtree)/modules.order $(MODLIB)/
1126 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1127 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1128
1129# This depmod is only for convenience to give the initial
1130# boot a modules.dep even before / is mounted read-write. However the
1131# boot script depmod is the master version.
1132PHONY += _modinst_post
1133_modinst_post: _modinst_
1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1135 $(call cmd,depmod)
1136
1137ifeq ($(CONFIG_MODULE_SIG), y)
1138PHONY += modules_sign
1139modules_sign:
1140 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1141endif
1142
1143else # CONFIG_MODULES
1144
1145# Modules not configured
1146# ---------------------------------------------------------------------------
1147
1148modules modules_install: FORCE
1149 @echo >&2
1150 @echo >&2 "The present kernel configuration has modules disabled."
1151 @echo >&2 "Type 'make config' and enable loadable module support."
1152 @echo >&2 "Then build a kernel with module support enabled."
1153 @echo >&2
1154 @exit 1
1155
1156endif # CONFIG_MODULES
1157
1158###
1159# Cleaning is done on three levels.
1160# make clean Delete most generated files
1161# Leave enough to build external modules
1162# make mrproper Delete the current configuration, and all generated files
1163# make distclean Remove editor backup files, patch leftover files and the like
1164
1165# Directories & files removed with 'make clean'
1166CLEAN_DIRS += $(MODVERDIR)
1167
1168# Directories & files removed with 'make mrproper'
1169MRPROPER_DIRS += include/config usr/include include/generated \
1170 arch/*/include/generated .tmp_objdiff
1171MRPROPER_FILES += .config .config.old .version .old_version \
1172 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1173 signing_key.pem signing_key.priv signing_key.x509 \
1174 x509.genkey extra_certificates signing_key.x509.keyid \
1175 signing_key.x509.signer vmlinux-gdb.py
1176
1177# clean - Delete most, but leave enough to build external modules
1178#
1179clean: rm-dirs := $(CLEAN_DIRS)
1180clean: rm-files := $(CLEAN_FILES)
1181clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1182
1183PHONY += $(clean-dirs) clean archclean vmlinuxclean
1184$(clean-dirs):
1185 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1186
1187vmlinuxclean:
1188 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1189
1190clean: archclean vmlinuxclean
1191
1192# mrproper - Delete all generated files, including .config
1193#
1194mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1195mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1196mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1197
1198PHONY += $(mrproper-dirs) mrproper archmrproper
1199$(mrproper-dirs):
1200 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1201
1202mrproper: clean archmrproper $(mrproper-dirs)
1203 $(call cmd,rmdirs)
1204 $(call cmd,rmfiles)
1205
1206# distclean
1207#
1208PHONY += distclean
1209
1210distclean: mrproper
1211 @find $(srctree) $(RCS_FIND_IGNORE) \
1212 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1213 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1214 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1215 -type f -print | xargs rm -f
1216
1217
1218# Packaging of the kernel to various formats
1219# ---------------------------------------------------------------------------
1220# rpm target kept for backward compatibility
1221package-dir := scripts/package
1222
1223%src-pkg: FORCE
1224 $(Q)$(MAKE) $(build)=$(package-dir) $@
1225%pkg: include/config/kernel.release FORCE
1226 $(Q)$(MAKE) $(build)=$(package-dir) $@
1227rpm: include/config/kernel.release FORCE
1228 $(Q)$(MAKE) $(build)=$(package-dir) $@
1229
1230
1231# Brief documentation of the typical targets used
1232# ---------------------------------------------------------------------------
1233
1234boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1235boards := $(sort $(notdir $(boards)))
1236board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1237board-dirs := $(sort $(notdir $(board-dirs:/=)))
1238
1239help:
1240 @echo 'Cleaning targets:'
1241 @echo ' clean - Remove most generated files but keep the config and'
1242 @echo ' enough build support to build external modules'
1243 @echo ' mrproper - Remove all generated files + config + various backup files'
1244 @echo ' distclean - mrproper + remove editor backup and patch files'
1245 @echo ''
1246 @echo 'Configuration targets:'
1247 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1248 @echo ''
1249 @echo 'Other generic targets:'
1250 @echo ' all - Build all targets marked with [*]'
1251 @echo '* vmlinux - Build the bare kernel'
1252 @echo '* modules - Build all modules'
1253 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1254 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1255 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1256 @echo ' dir/ - Build all files in dir and below'
1257 @echo ' dir/file.[oisS] - Build specified target only'
1258 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1259 @echo ' (requires a recent binutils and recent build (System.map))'
1260 @echo ' dir/file.ko - Build module including final link'
1261 @echo ' modules_prepare - Set up for building external modules'
1262 @echo ' tags/TAGS - Generate tags file for editors'
1263 @echo ' cscope - Generate cscope index'
1264 @echo ' gtags - Generate GNU GLOBAL index'
1265 @echo ' kernelrelease - Output the release version string (use with make -s)'
1266 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1267 @echo ' image_name - Output the image name (use with make -s)'
1268 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1269 echo ' (default: $(INSTALL_HDR_PATH))'; \
1270 echo ''
1271 @echo 'Static analysers'
1272 @echo ' checkstack - Generate a list of stack hogs'
1273 @echo ' namespacecheck - Name space analysis on compiled kernel'
1274 @echo ' versioncheck - Sanity check on version.h usage'
1275 @echo ' includecheck - Check for duplicate included header files'
1276 @echo ' export_report - List the usages of all exported symbols'
1277 @echo ' headers_check - Sanity check on exported headers'
1278 @echo ' headerdep - Detect inclusion cycles in headers'
1279 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1280 @echo ''
1281 @echo 'Kernel selftest'
1282 @echo ' kselftest - Build and run kernel selftest (run as root)'
1283 @echo ' Build, install, and boot kernel before'
1284 @echo ' running kselftest on it'
1285 @echo ''
1286 @echo 'Kernel packaging:'
1287 @$(MAKE) $(build)=$(package-dir) help
1288 @echo ''
1289 @echo 'Documentation targets:'
1290 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1291 @echo ''
1292 @echo 'Architecture specific targets ($(SRCARCH)):'
1293 @$(if $(archhelp),$(archhelp),\
1294 echo ' No architecture specific help defined for $(SRCARCH)')
1295 @echo ''
1296 @$(if $(boards), \
1297 $(foreach b, $(boards), \
1298 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1299 echo '')
1300 @$(if $(board-dirs), \
1301 $(foreach b, $(board-dirs), \
1302 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1303 printf " %-16s - Show all of the above\\n" help-boards; \
1304 echo '')
1305
1306 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1307 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1308 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1309 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1310 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1311 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1312 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1313 @echo ' 1: warnings which may be relevant and do not occur too often'
1314 @echo ' 2: warnings which occur quite often but may still be relevant'
1315 @echo ' 3: more obscure warnings, can most likely be ignored'
1316 @echo ' Multiple levels can be combined with W=12 or W=123'
1317 @echo ''
1318 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1319 @echo 'For further info see the ./README file'
1320
1321
1322help-board-dirs := $(addprefix help-,$(board-dirs))
1323
1324help-boards: $(help-board-dirs)
1325
1326boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1327
1328$(help-board-dirs): help-%:
1329 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1330 @$(if $(boards-per-dir), \
1331 $(foreach b, $(boards-per-dir), \
1332 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1333 echo '')
1334
1335
1336# Documentation targets
1337# ---------------------------------------------------------------------------
1338%docs: scripts_basic FORCE
1339 $(Q)$(MAKE) $(build)=scripts build_docproc
1340 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1341
1342else # KBUILD_EXTMOD
1343
1344###
1345# External module support.
1346# When building external modules the kernel used as basis is considered
1347# read-only, and no consistency checks are made and the make
1348# system is not used on the basis kernel. If updates are required
1349# in the basis kernel ordinary make commands (without M=...) must
1350# be used.
1351#
1352# The following are the only valid targets when building external
1353# modules.
1354# make M=dir clean Delete all automatically generated files
1355# make M=dir modules Make all modules in specified dir
1356# make M=dir Same as 'make M=dir modules'
1357# make M=dir modules_install
1358# Install the modules built in the module directory
1359# Assumes install directory is already created
1360
1361# We are always building modules
1362KBUILD_MODULES := 1
1363PHONY += crmodverdir
1364crmodverdir:
1365 $(cmd_crmodverdir)
1366
1367PHONY += $(objtree)/Module.symvers
1368$(objtree)/Module.symvers:
1369 @test -e $(objtree)/Module.symvers || ( \
1370 echo; \
1371 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1372 echo " is missing; modules will have no dependencies and modversions."; \
1373 echo )
1374
1375module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1376PHONY += $(module-dirs) modules
1377$(module-dirs): crmodverdir $(objtree)/Module.symvers
1378 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1379
1380modules: $(module-dirs)
1381 @$(kecho) ' Building modules, stage 2.';
1382 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1383
1384PHONY += modules_install
1385modules_install: _emodinst_ _emodinst_post
1386
1387install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1388PHONY += _emodinst_
1389_emodinst_:
1390 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1392
1393PHONY += _emodinst_post
1394_emodinst_post: _emodinst_
1395 $(call cmd,depmod)
1396
1397clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1398
1399PHONY += $(clean-dirs) clean
1400$(clean-dirs):
1401 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1402
1403clean: rm-dirs := $(MODVERDIR)
1404clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1405
1406help:
1407 @echo ' Building external modules.'
1408 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1409 @echo ''
1410 @echo ' modules - default target, build the module(s)'
1411 @echo ' modules_install - install the module'
1412 @echo ' clean - remove generated files in module directory only'
1413 @echo ''
1414
1415# Dummies...
1416PHONY += prepare scripts
1417prepare: ;
1418scripts: ;
1419endif # KBUILD_EXTMOD
1420
1421clean: $(clean-dirs)
1422 $(call cmd,rmdirs)
1423 $(call cmd,rmfiles)
1424 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1425 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1426 -o -name '*.ko.*' \
1427 -o -name '*.dwo' \
1428 -o -name '*.su' \
1429 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1430 -o -name '*.symtypes' -o -name 'modules.order' \
1431 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1432 -o -name '*.gcno' \) -type f -print | xargs rm -f
1433
1434# Generate tags for editors
1435# ---------------------------------------------------------------------------
1436quiet_cmd_tags = GEN $@
1437 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1438
1439tags TAGS cscope gtags: FORCE
1440 $(call cmd,tags)
1441
1442# Scripts to check various things for consistency
1443# ---------------------------------------------------------------------------
1444
1445PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1446
1447includecheck:
1448 find $(srctree)/* $(RCS_FIND_IGNORE) \
1449 -name '*.[hcS]' -type f -print | sort \
1450 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1451
1452versioncheck:
1453 find $(srctree)/* $(RCS_FIND_IGNORE) \
1454 -name '*.[hcS]' -type f -print | sort \
1455 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1456
1457coccicheck:
1458 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1459
1460namespacecheck:
1461 $(PERL) $(srctree)/scripts/namespace.pl
1462
1463export_report:
1464 $(PERL) $(srctree)/scripts/export_report.pl
1465
1466endif #ifeq ($(config-targets),1)
1467endif #ifeq ($(mixed-targets),1)
1468
1469PHONY += checkstack kernelrelease kernelversion image_name
1470
1471# UML needs a little special treatment here. It wants to use the host
1472# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1473# else wants $(ARCH), including people doing cross-builds, which means
1474# that $(SUBARCH) doesn't work here.
1475ifeq ($(ARCH), um)
1476CHECKSTACK_ARCH := $(SUBARCH)
1477else
1478CHECKSTACK_ARCH := $(ARCH)
1479endif
1480checkstack:
1481 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1482 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1483
1484kernelrelease:
1485 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1486
1487kernelversion:
1488 @echo $(KERNELVERSION)
1489
1490image_name:
1491 @echo $(KBUILD_IMAGE)
1492
1493# Clear a bunch of variables before executing the submake
1494tools/: FORCE
1495 $(Q)mkdir -p $(objtree)/tools
1496 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1497
1498tools/%: FORCE
1499 $(Q)mkdir -p $(objtree)/tools
1500 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1501
1502# Single targets
1503# ---------------------------------------------------------------------------
1504# Single targets are compatible with:
1505# - build with mixed source and output
1506# - build with separate output dir 'make O=...'
1507# - external modules
1508#
1509# target-dir => where to store outputfile
1510# build-dir => directory in kernel source tree to use
1511
1512ifeq ($(KBUILD_EXTMOD),)
1513 build-dir = $(patsubst %/,%,$(dir $@))
1514 target-dir = $(dir $@)
1515else
1516 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1517 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1518 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1519endif
1520
1521%.s: %.c prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523%.i: %.c prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.o: %.c prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527%.lst: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529%.s: %.S prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531%.o: %.S prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533%.symtypes: %.c prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535
1536# Modules
1537/: prepare scripts FORCE
1538 $(cmd_crmodverdir)
1539 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540 $(build)=$(build-dir)
1541# Make sure the latest headers are built for Documentation
1542Documentation/: headers_install
1543%/: prepare scripts FORCE
1544 $(cmd_crmodverdir)
1545 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1546 $(build)=$(build-dir)
1547%.ko: prepare scripts FORCE
1548 $(cmd_crmodverdir)
1549 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1550 $(build)=$(build-dir) $(@:.ko=.o)
1551 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1552
1553# FIXME Should go into a make.lib or something
1554# ===========================================================================
1555
1556quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1557 cmd_rmdirs = rm -rf $(rm-dirs)
1558
1559quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1560 cmd_rmfiles = rm -f $(rm-files)
1561
1562# Run depmod only if we have System.map and depmod is executable
1563quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1564 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1565 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1566
1567# Create temporary dir for module support files
1568# clean it up only when building all modules
1569cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1570 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1571
1572# read all saved command lines
1573
1574targets := $(wildcard $(sort $(targets)))
1575cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1576
1577ifneq ($(cmd_files),)
1578 $(cmd_files): ; # Do not try to update included dependency files
1579 include $(cmd_files)
1580endif
1581
1582endif # skip-makefile
1583
1584PHONY += FORCE
1585FORCE:
1586
1587# Declare the contents of the .PHONY variable as phony. We keep that
1588# information in a variable so we can use it in if_changed and friends.
1589.PHONY: $(PHONY)