1VERSION = 4
2PATCHLEVEL = 4
3SUBLEVEL = 14
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 $(CF)
362CFLAGS_MODULE   =
363AFLAGS_MODULE   =
364LDFLAGS_MODULE  =
365CFLAGS_KERNEL	=
366AFLAGS_KERNEL	=
367CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage -fno-tree-loop-im
368
369
370# Use USERINCLUDE when you must reference the UAPI directories only.
371USERINCLUDE    := \
372		-I$(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/
553virt-y		:= virt/
554endif # KBUILD_EXTMOD
555
556ifeq ($(dot-config),1)
557# Read in config
558-include include/config/auto.conf
559
560ifeq ($(KBUILD_EXTMOD),)
561# Read in dependencies to all Kconfig* files, make sure to run
562# oldconfig if changes are detected.
563-include include/config/auto.conf.cmd
564
565# To avoid any implicit rule to kick in, define an empty command
566$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
567
568# If .config is newer than include/config/auto.conf, someone tinkered
569# with it and forgot to run make oldconfig.
570# if auto.conf.cmd is missing then we are probably in a cleaned tree so
571# we execute the config step to be sure to catch updated Kconfig files
572include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
573	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
574else
575# external modules needs include/generated/autoconf.h and include/config/auto.conf
576# but do not care if they are up-to-date. Use auto.conf to trigger the test
577PHONY += include/config/auto.conf
578
579include/config/auto.conf:
580	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
581	echo >&2;							\
582	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
583	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
584	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
585	echo >&2 ;							\
586	/bin/false)
587
588endif # KBUILD_EXTMOD
589
590else
591# Dummy target needed, because used as prerequisite
592include/config/auto.conf: ;
593endif # $(dot-config)
594
595# The all: target is the default when no target is given on the
596# command line.
597# This allow a user to issue only 'make' to build a kernel including modules
598# Defaults to vmlinux, but the arch makefile usually adds further targets
599all: vmlinux
600
601# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
602# values of the respective KBUILD_* variables
603ARCH_CPPFLAGS :=
604ARCH_AFLAGS :=
605ARCH_CFLAGS :=
606include arch/$(SRCARCH)/Makefile
607
608KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
609
610ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
611KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
612else
613KBUILD_CFLAGS	+= -O2
614endif
615
616# Tell gcc to never replace conditional load with a non-conditional one
617KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
618
619ifdef CONFIG_READABLE_ASM
620# Disable optimizations that make assembler listings hard to read.
621# reorder blocks reorders the control in the function
622# ipa clone creates specialized cloned functions
623# partial inlining inlines only parts of functions
624KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
625                 $(call cc-option,-fno-ipa-cp-clone,) \
626                 $(call cc-option,-fno-partial-inlining)
627endif
628
629ifneq ($(CONFIG_FRAME_WARN),0)
630KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
631endif
632
633# Handle stack protector mode.
634#
635# Since kbuild can potentially perform two passes (first with the old
636# .config values and then with updated .config values), we cannot error out
637# if a desired compiler option is unsupported. If we were to error, kbuild
638# could never get to the second pass and actually notice that we changed
639# the option to something that was supported.
640#
641# Additionally, we don't want to fallback and/or silently change which compiler
642# flags will be used, since that leads to producing kernels with different
643# security feature characteristics depending on the compiler used. ("But I
644# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
645#
646# The middle ground is to warn here so that the failed option is obvious, but
647# to let the build fail with bad compiler flags so that we can't produce a
648# kernel when there is a CONFIG and compiler mismatch.
649#
650ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
651  stackp-flag := -fstack-protector
652  ifeq ($(call cc-option, $(stackp-flag)),)
653    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
654             -fstack-protector not supported by compiler)
655  endif
656else
657ifdef CONFIG_CC_STACKPROTECTOR_STRONG
658  stackp-flag := -fstack-protector-strong
659  ifeq ($(call cc-option, $(stackp-flag)),)
660    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
661	      -fstack-protector-strong not supported by compiler)
662  endif
663else
664  # Force off for distro compilers that enable stack protector by default.
665  stackp-flag := $(call cc-option, -fno-stack-protector)
666endif
667endif
668KBUILD_CFLAGS += $(stackp-flag)
669
670ifeq ($(cc-name),clang)
671KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
672KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
673KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
674KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
675KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
676# Quiet clang warning: comparison of unsigned expression < 0 is always false
677KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
678# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
679# source of a reference will be _MergedGlobals and not on of the whitelisted names.
680# See modpost pattern 2
681KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
682KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
683else
684
685# These warnings generated too much noise in a regular build.
686# Use make W=1 to enable them (see scripts/Makefile.build)
687KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
688KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
689endif
690
691ifdef CONFIG_FRAME_POINTER
692KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
693else
694# Some targets (ARM with Thumb2, for example), can't be built with frame
695# pointers.  For those, we don't have FUNCTION_TRACER automatically
696# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
697# incompatible with -fomit-frame-pointer with current GCC, so we don't use
698# -fomit-frame-pointer with FUNCTION_TRACER.
699ifndef CONFIG_FUNCTION_TRACER
700KBUILD_CFLAGS	+= -fomit-frame-pointer
701endif
702endif
703
704KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
705
706ifdef CONFIG_DEBUG_INFO
707ifdef CONFIG_DEBUG_INFO_SPLIT
708KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
709else
710KBUILD_CFLAGS	+= -g
711endif
712KBUILD_AFLAGS	+= -Wa,-gdwarf-2
713endif
714ifdef CONFIG_DEBUG_INFO_DWARF4
715KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
716endif
717
718ifdef CONFIG_DEBUG_INFO_REDUCED
719KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
720		   $(call cc-option,-fno-var-tracking)
721endif
722
723ifdef CONFIG_FUNCTION_TRACER
724ifndef CC_FLAGS_FTRACE
725CC_FLAGS_FTRACE := -pg
726endif
727export CC_FLAGS_FTRACE
728ifdef CONFIG_HAVE_FENTRY
729CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
730endif
731KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
732KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
733ifdef CONFIG_DYNAMIC_FTRACE
734	ifdef CONFIG_HAVE_C_RECORDMCOUNT
735		BUILD_C_RECORDMCOUNT := y
736		export BUILD_C_RECORDMCOUNT
737	endif
738endif
739endif
740
741# We trigger additional mismatches with less inlining
742ifdef CONFIG_DEBUG_SECTION_MISMATCH
743KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
744endif
745
746# arch Makefile may override CC so keep this after arch Makefile is included
747NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
748CHECKFLAGS     += $(NOSTDINC_FLAGS)
749
750# warn about C99 declaration after statement
751KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
752
753# disable pointer signed / unsigned warnings in gcc 4.0
754KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
755
756# disable invalid "can't wrap" optimizations for signed / pointers
757KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
758
759# conserve stack if available
760KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
761
762# disallow errors like 'EXPORT_GPL(foo);' with missing header
763KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
764
765# require functions to have arguments in prototypes, not empty 'int foo()'
766KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
767
768# Prohibit date/time macros, which would make the build non-deterministic
769KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
770
771# use the deterministic mode of AR if available
772KBUILD_ARFLAGS := $(call ar-option,D)
773
774# check for 'asm goto'
775ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
776	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
777	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
778endif
779
780include scripts/Makefile.kasan
781include scripts/Makefile.extrawarn
782
783# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
784# last assignments
785KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
786KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
787KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
788
789# Use --build-id when available.
790LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
791			      $(call cc-ldoption, -Wl$(comma)--build-id,))
792KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
793LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
794
795ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
796LDFLAGS_vmlinux	+= $(call ld-option, -X,)
797endif
798
799# Default kernel image to build when no specific target is given.
800# KBUILD_IMAGE may be overruled on the command line or
801# set in the environment
802# Also any assignments in arch/$(ARCH)/Makefile take precedence over
803# this default value
804export KBUILD_IMAGE ?= vmlinux
805
806#
807# INSTALL_PATH specifies where to place the updated kernel and system map
808# images. Default is /boot, but you can set it to other values
809export	INSTALL_PATH ?= /boot
810
811#
812# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
813# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
814# an argument if needed. Otherwise it defaults to the kernel install path
815#
816export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
817
818#
819# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
820# relocations required by build roots.  This is not defined in the
821# makefile but the argument can be passed to make if needed.
822#
823
824MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
825export MODLIB
826
827#
828# INSTALL_MOD_STRIP, if defined, will cause modules to be
829# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
830# the default option --strip-debug will be used.  Otherwise,
831# INSTALL_MOD_STRIP value will be used as the options to the strip command.
832
833ifdef INSTALL_MOD_STRIP
834ifeq ($(INSTALL_MOD_STRIP),1)
835mod_strip_cmd = $(STRIP) --strip-debug
836else
837mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
838endif # INSTALL_MOD_STRIP=1
839else
840mod_strip_cmd = true
841endif # INSTALL_MOD_STRIP
842export mod_strip_cmd
843
844# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
845# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
846# or CONFIG_MODULE_COMPRESS_XZ.
847
848mod_compress_cmd = true
849ifdef CONFIG_MODULE_COMPRESS
850  ifdef CONFIG_MODULE_COMPRESS_GZIP
851    mod_compress_cmd = gzip -n -f
852  endif # CONFIG_MODULE_COMPRESS_GZIP
853  ifdef CONFIG_MODULE_COMPRESS_XZ
854    mod_compress_cmd = xz -f
855  endif # CONFIG_MODULE_COMPRESS_XZ
856endif # CONFIG_MODULE_COMPRESS
857export mod_compress_cmd
858
859# Select initial ramdisk compression format, default is gzip(1).
860# This shall be used by the dracut(8) tool while creating an initramfs image.
861#
862INITRD_COMPRESS-y                  := gzip
863INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
864INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
865INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
866INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
867INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
868# do not export INITRD_COMPRESS, since we didn't actually
869# choose a sane default compression above.
870# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
871
872ifdef CONFIG_MODULE_SIG_ALL
873$(eval $(call config_filename,MODULE_SIG_KEY))
874
875mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
876else
877mod_sign_cmd = true
878endif
879export mod_sign_cmd
880
881
882ifeq ($(KBUILD_EXTMOD),)
883core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
884
885vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
886		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
887		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
888
889vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
890		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
891
892init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
893core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
894drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
895net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
896libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
897libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
898libs-y		:= $(libs-y1) $(libs-y2)
899virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
900
901# Externally visible symbols (used by link-vmlinux.sh)
902export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
903export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
904export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
905export LDFLAGS_vmlinux
906# used by scripts/pacmage/Makefile
907export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
908
909vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
910
911# Final link of vmlinux
912      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
913quiet_cmd_link-vmlinux = LINK    $@
914
915# Include targets which we want to
916# execute if the rest of the kernel build went well.
917vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
918ifdef CONFIG_HEADERS_CHECK
919	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
920endif
921ifdef CONFIG_SAMPLES
922	$(Q)$(MAKE) $(build)=samples
923endif
924ifdef CONFIG_BUILD_DOCSRC
925	$(Q)$(MAKE) $(build)=Documentation
926endif
927ifdef CONFIG_GDB_SCRIPTS
928	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
929endif
930	+$(call if_changed,link-vmlinux)
931
932# The actual objects are generated when descending,
933# make sure no implicit rule kicks in
934$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
935
936# Handle descending into subdirectories listed in $(vmlinux-dirs)
937# Preset locale variables to speed up the build process. Limit locale
938# tweaks to this spot to avoid wrong language settings when running
939# make menuconfig etc.
940# Error messages still appears in the original language
941
942PHONY += $(vmlinux-dirs)
943$(vmlinux-dirs): prepare scripts
944	$(Q)$(MAKE) $(build)=$@
945
946define filechk_kernel.release
947	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
948endef
949
950# Store (new) KERNELRELEASE string in include/config/kernel.release
951include/config/kernel.release: include/config/auto.conf FORCE
952	$(call filechk,kernel.release)
953
954
955# Things we need to do before we recursively start building the kernel
956# or the modules are listed in "prepare".
957# A multi level approach is used. prepareN is processed before prepareN-1.
958# archprepare is used in arch Makefiles and when processed asm symlink,
959# version.h and scripts_basic is processed / created.
960
961# Listed in dependency order
962PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
963
964# prepare3 is used to check if we are building in a separate output directory,
965# and if so do:
966# 1) Check that make has not been executed in the kernel src $(srctree)
967prepare3: include/config/kernel.release
968ifneq ($(KBUILD_SRC),)
969	@$(kecho) '  Using $(srctree) as source for kernel'
970	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
971		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
972		echo >&2 "  in the '$(srctree)' directory.";\
973		/bin/false; \
974	fi;
975endif
976
977# prepare2 creates a makefile if using a separate output directory
978prepare2: prepare3 outputmakefile asm-generic
979
980prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
981                   include/config/auto.conf
982	$(cmd_crmodverdir)
983
984archprepare: archheaders archscripts prepare1 scripts_basic
985
986prepare0: archprepare FORCE
987	$(Q)$(MAKE) $(build)=.
988
989# All the preparing..
990prepare: prepare0
991
992# Generate some files
993# ---------------------------------------------------------------------------
994
995# KERNELRELEASE can change from a few different places, meaning version.h
996# needs to be updated, so this check is forced on all builds
997
998uts_len := 64
999define filechk_utsrelease.h
1000	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1001	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1002	  exit 1;                                                         \
1003	fi;                                                               \
1004	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1005endef
1006
1007define filechk_version.h
1008	(echo \#define LINUX_VERSION_CODE $(shell                         \
1009	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1010	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1011endef
1012
1013$(version_h): $(srctree)/Makefile FORCE
1014	$(call filechk,version.h)
1015	$(Q)rm -f $(old_version_h)
1016
1017include/generated/utsrelease.h: include/config/kernel.release FORCE
1018	$(call filechk,utsrelease.h)
1019
1020PHONY += headerdep
1021headerdep:
1022	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1023	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1024
1025# ---------------------------------------------------------------------------
1026# Firmware install
1027INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1028export INSTALL_FW_PATH
1029
1030PHONY += firmware_install
1031firmware_install: FORCE
1032	@mkdir -p $(objtree)/firmware
1033	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1034
1035# ---------------------------------------------------------------------------
1036# Kernel headers
1037
1038#Default location for installed headers
1039export INSTALL_HDR_PATH = $(objtree)/usr
1040
1041# If we do an all arch process set dst to asm-$(hdr-arch)
1042hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043
1044PHONY += archheaders
1045archheaders:
1046
1047PHONY += archscripts
1048archscripts:
1049
1050PHONY += __headers
1051__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1052	$(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1061	  $(error Headers not exportable for the $(SRCARCH) architecture))
1062	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1063	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1072	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Kernel selftest
1076
1077PHONY += kselftest
1078kselftest:
1079	$(Q)$(MAKE) -C tools/testing/selftests run_tests
1080
1081kselftest-clean:
1082	$(Q)$(MAKE) -C tools/testing/selftests clean
1083
1084# ---------------------------------------------------------------------------
1085# Modules
1086
1087ifdef CONFIG_MODULES
1088
1089# By default, build modules as well
1090
1091all: modules
1092
1093# Build modules
1094#
1095# A module can be listed more than once in obj-m resulting in
1096# duplicate lines in modules.order files.  Those are removed
1097# using awk while concatenating to the final file.
1098
1099PHONY += modules
1100modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1101	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1102	@$(kecho) '  Building modules, stage 2.';
1103	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1104	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1105
1106modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1107	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1108
1109%/modules.builtin: include/config/auto.conf
1110	$(Q)$(MAKE) $(modbuiltin)=$*
1111
1112
1113# Target to prepare building external modules
1114PHONY += modules_prepare
1115modules_prepare: prepare scripts
1116
1117# Target to install modules
1118PHONY += modules_install
1119modules_install: _modinst_ _modinst_post
1120
1121PHONY += _modinst_
1122_modinst_:
1123	@rm -rf $(MODLIB)/kernel
1124	@rm -f $(MODLIB)/source
1125	@mkdir -p $(MODLIB)/kernel
1126	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1127	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1128		rm -f $(MODLIB)/build ; \
1129		ln -s $(CURDIR) $(MODLIB)/build ; \
1130	fi
1131	@cp -f $(objtree)/modules.order $(MODLIB)/
1132	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1133	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1134
1135# This depmod is only for convenience to give the initial
1136# boot a modules.dep even before / is mounted read-write.  However the
1137# boot script depmod is the master version.
1138PHONY += _modinst_post
1139_modinst_post: _modinst_
1140	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1141	$(call cmd,depmod)
1142
1143ifeq ($(CONFIG_MODULE_SIG), y)
1144PHONY += modules_sign
1145modules_sign:
1146	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1147endif
1148
1149else # CONFIG_MODULES
1150
1151# Modules not configured
1152# ---------------------------------------------------------------------------
1153
1154modules modules_install: FORCE
1155	@echo >&2
1156	@echo >&2 "The present kernel configuration has modules disabled."
1157	@echo >&2 "Type 'make config' and enable loadable module support."
1158	@echo >&2 "Then build a kernel with module support enabled."
1159	@echo >&2
1160	@exit 1
1161
1162endif # CONFIG_MODULES
1163
1164###
1165# Cleaning is done on three levels.
1166# make clean     Delete most generated files
1167#                Leave enough to build external modules
1168# make mrproper  Delete the current configuration, and all generated files
1169# make distclean Remove editor backup files, patch leftover files and the like
1170
1171# Directories & files removed with 'make clean'
1172CLEAN_DIRS  += $(MODVERDIR)
1173
1174# Directories & files removed with 'make mrproper'
1175MRPROPER_DIRS  += include/config usr/include include/generated          \
1176		  arch/*/include/generated .tmp_objdiff
1177MRPROPER_FILES += .config .config.old .version .old_version \
1178		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1179		  signing_key.pem signing_key.priv signing_key.x509	\
1180		  x509.genkey extra_certificates signing_key.x509.keyid	\
1181		  signing_key.x509.signer vmlinux-gdb.py
1182
1183# clean - Delete most, but leave enough to build external modules
1184#
1185clean: rm-dirs  := $(CLEAN_DIRS)
1186clean: rm-files := $(CLEAN_FILES)
1187clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1188
1189PHONY += $(clean-dirs) clean archclean vmlinuxclean
1190$(clean-dirs):
1191	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1192
1193vmlinuxclean:
1194	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1195
1196clean: archclean vmlinuxclean
1197
1198# mrproper - Delete all generated files, including .config
1199#
1200mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1201mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1202mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1203
1204PHONY += $(mrproper-dirs) mrproper archmrproper
1205$(mrproper-dirs):
1206	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1207
1208mrproper: clean archmrproper $(mrproper-dirs)
1209	$(call cmd,rmdirs)
1210	$(call cmd,rmfiles)
1211
1212# distclean
1213#
1214PHONY += distclean
1215
1216distclean: mrproper
1217	@find $(srctree) $(RCS_FIND_IGNORE) \
1218		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1219		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1220		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1221		-type f -print | xargs rm -f
1222
1223
1224# Packaging of the kernel to various formats
1225# ---------------------------------------------------------------------------
1226# rpm target kept for backward compatibility
1227package-dir	:= scripts/package
1228
1229%src-pkg: FORCE
1230	$(Q)$(MAKE) $(build)=$(package-dir) $@
1231%pkg: include/config/kernel.release FORCE
1232	$(Q)$(MAKE) $(build)=$(package-dir) $@
1233rpm: include/config/kernel.release FORCE
1234	$(Q)$(MAKE) $(build)=$(package-dir) $@
1235
1236
1237# Brief documentation of the typical targets used
1238# ---------------------------------------------------------------------------
1239
1240boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1241boards := $(sort $(notdir $(boards)))
1242board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1243board-dirs := $(sort $(notdir $(board-dirs:/=)))
1244
1245help:
1246	@echo  'Cleaning targets:'
1247	@echo  '  clean		  - Remove most generated files but keep the config and'
1248	@echo  '                    enough build support to build external modules'
1249	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1250	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1251	@echo  ''
1252	@echo  'Configuration targets:'
1253	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1254	@echo  ''
1255	@echo  'Other generic targets:'
1256	@echo  '  all		  - Build all targets marked with [*]'
1257	@echo  '* vmlinux	  - Build the bare kernel'
1258	@echo  '* modules	  - Build all modules'
1259	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1260	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1261	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1262	@echo  '  dir/            - Build all files in dir and below'
1263	@echo  '  dir/file.[oisS] - Build specified target only'
1264	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1265	@echo  '                    (requires a recent binutils and recent build (System.map))'
1266	@echo  '  dir/file.ko     - Build module including final link'
1267	@echo  '  modules_prepare - Set up for building external modules'
1268	@echo  '  tags/TAGS	  - Generate tags file for editors'
1269	@echo  '  cscope	  - Generate cscope index'
1270	@echo  '  gtags           - Generate GNU GLOBAL index'
1271	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1272	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1273	@echo  '  image_name	  - Output the image name (use with make -s)'
1274	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1275	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1276	 echo  ''
1277	@echo  'Static analysers'
1278	@echo  '  checkstack      - Generate a list of stack hogs'
1279	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1280	@echo  '  versioncheck    - Sanity check on version.h usage'
1281	@echo  '  includecheck    - Check for duplicate included header files'
1282	@echo  '  export_report   - List the usages of all exported symbols'
1283	@echo  '  headers_check   - Sanity check on exported headers'
1284	@echo  '  headerdep       - Detect inclusion cycles in headers'
1285	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1286	@echo  ''
1287	@echo  'Kernel selftest'
1288	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1289	@echo  '                    Build, install, and boot kernel before'
1290	@echo  '                    running kselftest on it'
1291	@echo  '  kselftest-clean - Remove all generated kselftest files'
1292	@echo  ''
1293	@echo  'Kernel packaging:'
1294	@$(MAKE) $(build)=$(package-dir) help
1295	@echo  ''
1296	@echo  'Documentation targets:'
1297	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1298	@echo  ''
1299	@echo  'Architecture specific targets ($(SRCARCH)):'
1300	@$(if $(archhelp),$(archhelp),\
1301		echo '  No architecture specific help defined for $(SRCARCH)')
1302	@echo  ''
1303	@$(if $(boards), \
1304		$(foreach b, $(boards), \
1305		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1306		echo '')
1307	@$(if $(board-dirs), \
1308		$(foreach b, $(board-dirs), \
1309		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1310		printf "  %-16s - Show all of the above\\n" help-boards; \
1311		echo '')
1312
1313	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1314	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1315	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1316	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1317	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1318	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1319	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1320	@echo  '		1: warnings which may be relevant and do not occur too often'
1321	@echo  '		2: warnings which occur quite often but may still be relevant'
1322	@echo  '		3: more obscure warnings, can most likely be ignored'
1323	@echo  '		Multiple levels can be combined with W=12 or W=123'
1324	@echo  ''
1325	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1326	@echo  'For further info see the ./README file'
1327
1328
1329help-board-dirs := $(addprefix help-,$(board-dirs))
1330
1331help-boards: $(help-board-dirs)
1332
1333boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1334
1335$(help-board-dirs): help-%:
1336	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1337	@$(if $(boards-per-dir), \
1338		$(foreach b, $(boards-per-dir), \
1339		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1340		echo '')
1341
1342
1343# Documentation targets
1344# ---------------------------------------------------------------------------
1345%docs: scripts_basic FORCE
1346	$(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1347	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1348
1349else # KBUILD_EXTMOD
1350
1351###
1352# External module support.
1353# When building external modules the kernel used as basis is considered
1354# read-only, and no consistency checks are made and the make
1355# system is not used on the basis kernel. If updates are required
1356# in the basis kernel ordinary make commands (without M=...) must
1357# be used.
1358#
1359# The following are the only valid targets when building external
1360# modules.
1361# make M=dir clean     Delete all automatically generated files
1362# make M=dir modules   Make all modules in specified dir
1363# make M=dir	       Same as 'make M=dir modules'
1364# make M=dir modules_install
1365#                      Install the modules built in the module directory
1366#                      Assumes install directory is already created
1367
1368# We are always building modules
1369KBUILD_MODULES := 1
1370PHONY += crmodverdir
1371crmodverdir:
1372	$(cmd_crmodverdir)
1373
1374PHONY += $(objtree)/Module.symvers
1375$(objtree)/Module.symvers:
1376	@test -e $(objtree)/Module.symvers || ( \
1377	echo; \
1378	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1379	echo "           is missing; modules will have no dependencies and modversions."; \
1380	echo )
1381
1382module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1383PHONY += $(module-dirs) modules
1384$(module-dirs): crmodverdir $(objtree)/Module.symvers
1385	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1386
1387modules: $(module-dirs)
1388	@$(kecho) '  Building modules, stage 2.';
1389	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1390
1391PHONY += modules_install
1392modules_install: _emodinst_ _emodinst_post
1393
1394install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1395PHONY += _emodinst_
1396_emodinst_:
1397	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1398	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1399
1400PHONY += _emodinst_post
1401_emodinst_post: _emodinst_
1402	$(call cmd,depmod)
1403
1404clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1405
1406PHONY += $(clean-dirs) clean
1407$(clean-dirs):
1408	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1409
1410clean:	rm-dirs := $(MODVERDIR)
1411clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1412
1413help:
1414	@echo  '  Building external modules.'
1415	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1416	@echo  ''
1417	@echo  '  modules         - default target, build the module(s)'
1418	@echo  '  modules_install - install the module'
1419	@echo  '  clean           - remove generated files in module directory only'
1420	@echo  ''
1421
1422# Dummies...
1423PHONY += prepare scripts
1424prepare: ;
1425scripts: ;
1426endif # KBUILD_EXTMOD
1427
1428clean: $(clean-dirs)
1429	$(call cmd,rmdirs)
1430	$(call cmd,rmfiles)
1431	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1432		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1433		-o -name '*.ko.*' \
1434		-o -name '*.dwo'  \
1435		-o -name '*.su'  \
1436		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1437		-o -name '*.symtypes' -o -name 'modules.order' \
1438		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1439		-o -name '*.gcno' \) -type f -print | xargs rm -f
1440
1441# Generate tags for editors
1442# ---------------------------------------------------------------------------
1443quiet_cmd_tags = GEN     $@
1444      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1445
1446tags TAGS cscope gtags: FORCE
1447	$(call cmd,tags)
1448
1449# Scripts to check various things for consistency
1450# ---------------------------------------------------------------------------
1451
1452PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1453
1454includecheck:
1455	find $(srctree)/* $(RCS_FIND_IGNORE) \
1456		-name '*.[hcS]' -type f -print | sort \
1457		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1458
1459versioncheck:
1460	find $(srctree)/* $(RCS_FIND_IGNORE) \
1461		-name '*.[hcS]' -type f -print | sort \
1462		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1463
1464coccicheck:
1465	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1466
1467namespacecheck:
1468	$(PERL) $(srctree)/scripts/namespace.pl
1469
1470export_report:
1471	$(PERL) $(srctree)/scripts/export_report.pl
1472
1473endif #ifeq ($(config-targets),1)
1474endif #ifeq ($(mixed-targets),1)
1475
1476PHONY += checkstack kernelrelease kernelversion image_name
1477
1478# UML needs a little special treatment here.  It wants to use the host
1479# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1480# else wants $(ARCH), including people doing cross-builds, which means
1481# that $(SUBARCH) doesn't work here.
1482ifeq ($(ARCH), um)
1483CHECKSTACK_ARCH := $(SUBARCH)
1484else
1485CHECKSTACK_ARCH := $(ARCH)
1486endif
1487checkstack:
1488	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1489	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1490
1491kernelrelease:
1492	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1493
1494kernelversion:
1495	@echo $(KERNELVERSION)
1496
1497image_name:
1498	@echo $(KBUILD_IMAGE)
1499
1500# Clear a bunch of variables before executing the submake
1501tools/: FORCE
1502	$(Q)mkdir -p $(objtree)/tools
1503	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1504
1505tools/%: FORCE
1506	$(Q)mkdir -p $(objtree)/tools
1507	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1508
1509# Single targets
1510# ---------------------------------------------------------------------------
1511# Single targets are compatible with:
1512# - build with mixed source and output
1513# - build with separate output dir 'make O=...'
1514# - external modules
1515#
1516#  target-dir => where to store outputfile
1517#  build-dir  => directory in kernel source tree to use
1518
1519ifeq ($(KBUILD_EXTMOD),)
1520        build-dir  = $(patsubst %/,%,$(dir $@))
1521        target-dir = $(dir $@)
1522else
1523        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1524        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1525        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1526endif
1527
1528%.s: %.c prepare scripts FORCE
1529	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530%.i: %.c prepare scripts FORCE
1531	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532%.o: %.c prepare scripts FORCE
1533	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534%.lst: %.c prepare scripts FORCE
1535	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536%.s: %.S prepare scripts FORCE
1537	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538%.o: %.S prepare scripts FORCE
1539	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1540%.symtypes: %.c prepare scripts FORCE
1541	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1542
1543# Modules
1544/: prepare scripts FORCE
1545	$(cmd_crmodverdir)
1546	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1547	$(build)=$(build-dir)
1548# Make sure the latest headers are built for Documentation
1549Documentation/: headers_install
1550%/: prepare scripts FORCE
1551	$(cmd_crmodverdir)
1552	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1553	$(build)=$(build-dir)
1554%.ko: prepare scripts FORCE
1555	$(cmd_crmodverdir)
1556	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1557	$(build)=$(build-dir) $(@:.ko=.o)
1558	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1559
1560# FIXME Should go into a make.lib or something
1561# ===========================================================================
1562
1563quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1564      cmd_rmdirs = rm -rf $(rm-dirs)
1565
1566quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1567      cmd_rmfiles = rm -f $(rm-files)
1568
1569# Run depmod only if we have System.map and depmod is executable
1570quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1571      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1572                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1573
1574# Create temporary dir for module support files
1575# clean it up only when building all modules
1576cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1577                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1578
1579# read all saved command lines
1580
1581targets := $(wildcard $(sort $(targets)))
1582cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1583
1584ifneq ($(cmd_files),)
1585  $(cmd_files): ;	# Do not try to update included dependency files
1586  include $(cmd_files)
1587endif
1588
1589endif	# skip-makefile
1590
1591PHONY += FORCE
1592FORCE:
1593
1594# Declare the contents of the .PHONY variable as phony.  We keep that
1595# information in a variable so we can use it in if_changed and friends.
1596.PHONY: $(PHONY)
1597