1VERSION = 3 2PATCHLEVEL = 17 3SUBLEVEL = 0 4EXTRAVERSION = 5NAME = Shuffling Zombie Juror 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# Do not: 14# o use make's built-in rules and variables 15# (this increases performance and avoids hard-to-debug behaviour); 16# o print "Entering directory ..."; 17MAKEFLAGS += -rR --no-print-directory 18 19# Avoid funny character set dependencies 20unexport LC_ALL 21LC_COLLATE=C 22LC_NUMERIC=C 23export LC_COLLATE LC_NUMERIC 24 25# Avoid interference with shell env settings 26unexport GREP_OPTIONS 27 28# We are using a recursive build, so we need to do a little thinking 29# to get the ordering right. 30# 31# Most importantly: sub-Makefiles should only ever modify files in 32# their own directory. If in some directory we have a dependency on 33# a file in another dir (which doesn't happen often, but it's often 34# unavoidable when linking the built-in.o targets which finally 35# turn into vmlinux), we will call a sub make in that other dir, and 36# after that we are sure that everything which is in that other dir 37# is now up to date. 38# 39# The only cases where we need to modify files which have global 40# effects are thus separated out and done before the recursive 41# descending is started. They are now explicitly listed as the 42# prepare rule. 43 44# Beautify output 45# --------------------------------------------------------------------------- 46# 47# Normally, we echo the whole command before executing it. By making 48# that echo $($(quiet)$(cmd)), we now have the possibility to set 49# $(quiet) to choose other forms of output instead, e.g. 50# 51# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 52# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 53# 54# If $(quiet) is empty, the whole command will be printed. 55# If it is set to "quiet_", only the short version will be printed. 56# If it is set to "silent_", nothing will be printed at all, since 57# the variable $(silent_cmd_cc_o_c) doesn't exist. 58# 59# A simple variant is to prefix commands with $(Q) - that's useful 60# for commands that shall be hidden in non-verbose mode. 61# 62# $(Q)ln $@ :< 63# 64# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 65# If KBUILD_VERBOSE equals 1 then the above command is displayed. 66# 67# To put more focus on warnings, be less verbose as default 68# Use 'make V=1' to see the full commands 69 70ifeq ("$(origin V)", "command line") 71 KBUILD_VERBOSE = $(V) 72endif 73ifndef KBUILD_VERBOSE 74 KBUILD_VERBOSE = 0 75endif 76 77ifeq ($(KBUILD_VERBOSE),1) 78 quiet = 79 Q = 80else 81 quiet=quiet_ 82 Q = @ 83endif 84 85# If the user is running make -s (silent mode), suppress echoing of 86# commands 87 88ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 89ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 90 quiet=silent_ 91endif 92else # make-3.8x 93ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 94 quiet=silent_ 95endif 96endif 97 98export quiet Q KBUILD_VERBOSE 99 100# Call a source code checker (by default, "sparse") as part of the 101# C compilation. 102# 103# Use 'make C=1' to enable checking of only re-compiled files. 104# Use 'make C=2' to enable checking of *all* source files, regardless 105# of whether they are re-compiled or not. 106# 107# See the file "Documentation/sparse.txt" for more details, including 108# where to get the "sparse" utility. 109 110ifeq ("$(origin C)", "command line") 111 KBUILD_CHECKSRC = $(C) 112endif 113ifndef KBUILD_CHECKSRC 114 KBUILD_CHECKSRC = 0 115endif 116 117# Use make M=dir to specify directory of external module to build 118# Old syntax make ... SUBDIRS=$PWD is still supported 119# Setting the environment variable KBUILD_EXTMOD take precedence 120ifdef SUBDIRS 121 KBUILD_EXTMOD ?= $(SUBDIRS) 122endif 123 124ifeq ("$(origin M)", "command line") 125 KBUILD_EXTMOD := $(M) 126endif 127 128# kbuild supports saving output files in a separate directory. 129# To locate output files in a separate directory two syntaxes are supported. 130# In both cases the working directory must be the root of the kernel src. 131# 1) O= 132# Use "make O=dir/to/store/output/files/" 133# 134# 2) Set KBUILD_OUTPUT 135# Set the environment variable KBUILD_OUTPUT to point to the directory 136# where the output files shall be placed. 137# export KBUILD_OUTPUT=dir/to/store/output/files/ 138# make 139# 140# The O= assignment takes precedence over the KBUILD_OUTPUT environment 141# variable. 142 143 144# KBUILD_SRC is set on invocation of make in OBJ directory 145# KBUILD_SRC is not intended to be used by the regular user (for now) 146ifeq ($(KBUILD_SRC),) 147 148# OK, Make called in directory where kernel src resides 149# Do we want to locate output files in a separate directory? 150ifeq ("$(origin O)", "command line") 151 KBUILD_OUTPUT := $(O) 152endif 153 154# That's our default target when none is given on the command line 155PHONY := _all 156_all: 157 158# Cancel implicit rules on top Makefile 159$(CURDIR)/Makefile Makefile: ; 160 161ifneq ($(KBUILD_OUTPUT),) 162# Invoke a second make in the output directory, passing relevant variables 163# check that the output directory actually exists 164saved-output := $(KBUILD_OUTPUT) 165KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 166 && /bin/pwd) 167$(if $(KBUILD_OUTPUT),, \ 168 $(error failed to create output directory "$(saved-output)")) 169 170PHONY += $(MAKECMDGOALS) sub-make 171 172$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 173 @: 174 175# Fake the "Entering directory" message once, so that IDEs/editors are 176# able to understand relative filenames. 177 echodir := @echo 178 quiet_echodir := @echo 179silent_echodir := @: 180sub-make: FORCE 181 $($(quiet)echodir) "make[1]: Entering directory \`$(KBUILD_OUTPUT)'" 182 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 183 KBUILD_SRC=$(CURDIR) \ 184 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 185 $(filter-out _all sub-make,$(MAKECMDGOALS)) 186 187# Leave processing to above invocation of make 188skip-makefile := 1 189endif # ifneq ($(KBUILD_OUTPUT),) 190endif # ifeq ($(KBUILD_SRC),) 191 192# We process the rest of the Makefile if this is the final invocation of make 193ifeq ($(skip-makefile),) 194 195# If building an external module we do not care about the all: rule 196# but instead _all depend on modules 197PHONY += all 198ifeq ($(KBUILD_EXTMOD),) 199_all: all 200else 201_all: modules 202endif 203 204ifeq ($(KBUILD_SRC),) 205 # building in the source tree 206 srctree := . 207else 208 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 209 # building in a subdirectory of the source tree 210 srctree := .. 211 else 212 srctree := $(KBUILD_SRC) 213 endif 214endif 215objtree := . 216src := $(srctree) 217obj := $(objtree) 218 219VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 220 221export srctree objtree VPATH 222 223 224# SUBARCH tells the usermode build what the underlying arch is. That is set 225# first, and if a usermode build is happening, the "ARCH=um" on the command 226# line overrides the setting of ARCH below. If a native build is happening, 227# then ARCH is assigned, getting whatever value it gets normally, and 228# SUBARCH is subsequently ignored. 229 230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 231 -e s/sun4u/sparc64/ \ 232 -e s/arm.*/arm/ -e s/sa110/arm/ \ 233 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 236 237# Cross compiling and selecting different set of gcc/bin-utils 238# --------------------------------------------------------------------------- 239# 240# When performing cross compilation for other architectures ARCH shall be set 241# to the target architecture. (See arch/* for the possibilities). 242# ARCH can be set during invocation of make: 243# make ARCH=ia64 244# Another way is to have ARCH set in the environment. 245# The default ARCH is the host where make is executed. 246 247# CROSS_COMPILE specify the prefix used for all executables used 248# during compilation. Only gcc and related bin-utils executables 249# are prefixed with $(CROSS_COMPILE). 250# CROSS_COMPILE can be set on the command line 251# make CROSS_COMPILE=ia64-linux- 252# Alternatively CROSS_COMPILE can be set in the environment. 253# A third alternative is to store a setting in .config so that plain 254# "make" in the configured kernel build directory always uses that. 255# Default value for CROSS_COMPILE is not to prefix executables 256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 257ARCH ?= $(SUBARCH) 258CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 259 260# Architecture as present in compile.h 261UTS_MACHINE := $(ARCH) 262SRCARCH := $(ARCH) 263 264# Additional ARCH settings for x86 265ifeq ($(ARCH),i386) 266 SRCARCH := x86 267endif 268ifeq ($(ARCH),x86_64) 269 SRCARCH := x86 270endif 271 272# Additional ARCH settings for sparc 273ifeq ($(ARCH),sparc32) 274 SRCARCH := sparc 275endif 276ifeq ($(ARCH),sparc64) 277 SRCARCH := sparc 278endif 279 280# Additional ARCH settings for sh 281ifeq ($(ARCH),sh64) 282 SRCARCH := sh 283endif 284 285# Additional ARCH settings for tile 286ifeq ($(ARCH),tilepro) 287 SRCARCH := tile 288endif 289ifeq ($(ARCH),tilegx) 290 SRCARCH := tile 291endif 292 293# Where to locate arch specific headers 294hdr-arch := $(SRCARCH) 295 296KCONFIG_CONFIG ?= .config 297export KCONFIG_CONFIG 298 299# SHELL used by kbuild 300CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 301 else if [ -x /bin/bash ]; then echo /bin/bash; \ 302 else echo sh; fi ; fi) 303 304HOSTCC = gcc 305HOSTCXX = g++ 306HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 307HOSTCXXFLAGS = -O2 308 309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 312endif 313 314# Decide whether to build built-in, modular, or both. 315# Normally, just do built-in. 316 317KBUILD_MODULES := 318KBUILD_BUILTIN := 1 319 320# If we have only "make modules", don't compile built-in objects. 321# When we're building modules with modversions, we need to consider 322# the built-in objects during the descend as well, in order to 323# make sure the checksums are up to date before we record them. 324 325ifeq ($(MAKECMDGOALS),modules) 326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 327endif 328 329# If we have "make <whatever> modules", compile modules 330# in addition to whatever we do anyway. 331# Just "make" or "make all" shall build modules as well 332 333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 334 KBUILD_MODULES := 1 335endif 336 337ifeq ($(MAKECMDGOALS),) 338 KBUILD_MODULES := 1 339endif 340 341export KBUILD_MODULES KBUILD_BUILTIN 342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 343 344ifneq ($(CC),) 345ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 346COMPILER := clang 347else 348COMPILER := gcc 349endif 350export COMPILER 351endif 352 353# Look for make include files relative to root of kernel src 354MAKEFLAGS += --include-dir=$(srctree) 355 356# We need some generic definitions (do not try to remake the file). 357$(srctree)/scripts/Kbuild.include: ; 358include $(srctree)/scripts/Kbuild.include 359 360# Make variables (CC, etc...) 361AS = $(CROSS_COMPILE)as 362LD = $(CROSS_COMPILE)ld 363CC = $(CROSS_COMPILE)gcc 364CPP = $(CC) -E 365AR = $(CROSS_COMPILE)ar 366NM = $(CROSS_COMPILE)nm 367STRIP = $(CROSS_COMPILE)strip 368OBJCOPY = $(CROSS_COMPILE)objcopy 369OBJDUMP = $(CROSS_COMPILE)objdump 370AWK = awk 371GENKSYMS = scripts/genksyms/genksyms 372INSTALLKERNEL := installkernel 373DEPMOD = /sbin/depmod 374PERL = perl 375PYTHON = python 376CHECK = sparse 377 378CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 379 -Wbitwise -Wno-return-void $(CF) 380CFLAGS_MODULE = 381AFLAGS_MODULE = 382LDFLAGS_MODULE = 383CFLAGS_KERNEL = 384AFLAGS_KERNEL = 385CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 386 387 388# Use USERINCLUDE when you must reference the UAPI directories only. 389USERINCLUDE := \ 390 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 391 -Iarch/$(hdr-arch)/include/generated/uapi \ 392 -I$(srctree)/include/uapi \ 393 -Iinclude/generated/uapi \ 394 -include $(srctree)/include/linux/kconfig.h 395 396# Use LINUXINCLUDE when you must reference the include/ directory. 397# Needed to be compatible with the O= option 398LINUXINCLUDE := \ 399 -I$(srctree)/arch/$(hdr-arch)/include \ 400 -Iarch/$(hdr-arch)/include/generated \ 401 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 402 -Iinclude \ 403 $(USERINCLUDE) 404 405KBUILD_CPPFLAGS := -D__KERNEL__ 406 407KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 408 -fno-strict-aliasing -fno-common \ 409 -Werror-implicit-function-declaration \ 410 -Wno-format-security 411 412KBUILD_AFLAGS_KERNEL := 413KBUILD_CFLAGS_KERNEL := 414KBUILD_AFLAGS := -D__ASSEMBLY__ 415KBUILD_AFLAGS_MODULE := -DMODULE 416KBUILD_CFLAGS_MODULE := -DMODULE 417KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 418 419# Read KERNELRELEASE from include/config/kernel.release (if it exists) 420KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 421KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 422 423export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 424export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 425export CPP AR NM STRIP OBJCOPY OBJDUMP 426export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 427export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 428 429export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 430export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 431export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 432export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 433export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 434export KBUILD_ARFLAGS 435 436# When compiling out-of-tree modules, put MODVERDIR in the module 437# tree rather than in the kernel tree. The kernel tree might 438# even be read-only. 439export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 440 441# Files to ignore in find ... statements 442 443export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 444 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 445 -prune -o 446export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 447 --exclude CVS --exclude .pc --exclude .hg --exclude .git 448 449# =========================================================================== 450# Rules shared between *config targets and build targets 451 452# Basic helpers built in scripts/ 453PHONY += scripts_basic 454scripts_basic: 455 $(Q)$(MAKE) $(build)=scripts/basic 456 $(Q)rm -f .tmp_quiet_recordmcount 457 458# To avoid any implicit rule to kick in, define an empty command. 459scripts/basic/%: scripts_basic ; 460 461PHONY += outputmakefile 462# outputmakefile generates a Makefile in the output directory, if using a 463# separate output directory. This allows convenient use of make in the 464# output directory. 465outputmakefile: 466ifneq ($(KBUILD_SRC),) 467 $(Q)ln -fsn $(srctree) source 468 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 469 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 470endif 471 472# Support for using generic headers in asm-generic 473PHONY += asm-generic 474asm-generic: 475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 476 src=asm obj=arch/$(SRCARCH)/include/generated/asm 477 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 478 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 479 480# To make sure we do not include .config for any of the *config targets 481# catch them early, and hand them over to scripts/kconfig/Makefile 482# It is allowed to specify more targets when calling make, including 483# mixing *config targets and build targets. 484# For example 'make oldconfig all'. 485# Detect when mixed targets is specified, and make a second invocation 486# of make so .config is not included in this case either (for *config). 487 488version_h := include/generated/uapi/linux/version.h 489 490no-dot-config-targets := clean mrproper distclean \ 491 cscope gtags TAGS tags help %docs check% coccicheck \ 492 $(version_h) headers_% archheaders archscripts \ 493 kernelversion %src-pkg 494 495config-targets := 0 496mixed-targets := 0 497dot-config := 1 498 499ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 500 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 501 dot-config := 0 502 endif 503endif 504 505ifeq ($(KBUILD_EXTMOD),) 506 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 507 config-targets := 1 508 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 509 mixed-targets := 1 510 endif 511 endif 512endif 513 514ifeq ($(mixed-targets),1) 515# =========================================================================== 516# We're called with mixed targets (*config and build targets). 517# Handle them one by one. 518 519PHONY += $(MAKECMDGOALS) __build_one_by_one 520 521$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 522 @: 523 524__build_one_by_one: 525 $(Q)set -e; \ 526 for i in $(MAKECMDGOALS); do \ 527 $(MAKE) -f $(srctree)/Makefile $$i; \ 528 done 529 530else 531ifeq ($(config-targets),1) 532# =========================================================================== 533# *config targets only - make sure prerequisites are updated, and descend 534# in scripts/kconfig to make the *config target 535 536# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 537# KBUILD_DEFCONFIG may point out an alternative default configuration 538# used for 'make defconfig' 539include $(srctree)/arch/$(SRCARCH)/Makefile 540export KBUILD_DEFCONFIG KBUILD_KCONFIG 541 542config: scripts_basic outputmakefile FORCE 543 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 544 545%config: scripts_basic outputmakefile FORCE 546 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 547 548else 549# =========================================================================== 550# Build targets only - this includes vmlinux, arch specific targets, clean 551# targets and others. In general all targets except *config targets. 552 553ifeq ($(KBUILD_EXTMOD),) 554# Additional helpers built in scripts/ 555# Carefully list dependencies so we do not try to build scripts twice 556# in parallel 557PHONY += scripts 558scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 559 asm-generic 560 $(Q)$(MAKE) $(build)=$(@) 561 562# Objects we will link into vmlinux / subdirs we need to visit 563init-y := init/ 564drivers-y := drivers/ sound/ firmware/ 565net-y := net/ 566libs-y := lib/ 567core-y := usr/ 568endif # KBUILD_EXTMOD 569 570ifeq ($(dot-config),1) 571# Read in config 572-include include/config/auto.conf 573 574ifeq ($(KBUILD_EXTMOD),) 575# Read in dependencies to all Kconfig* files, make sure to run 576# oldconfig if changes are detected. 577-include include/config/auto.conf.cmd 578 579# To avoid any implicit rule to kick in, define an empty command 580$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 581 582# If .config is newer than include/config/auto.conf, someone tinkered 583# with it and forgot to run make oldconfig. 584# if auto.conf.cmd is missing then we are probably in a cleaned tree so 585# we execute the config step to be sure to catch updated Kconfig files 586include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 587 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 588else 589# external modules needs include/generated/autoconf.h and include/config/auto.conf 590# but do not care if they are up-to-date. Use auto.conf to trigger the test 591PHONY += include/config/auto.conf 592 593include/config/auto.conf: 594 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 595 echo >&2; \ 596 echo >&2 " ERROR: Kernel configuration is invalid."; \ 597 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 598 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 599 echo >&2 ; \ 600 /bin/false) 601 602endif # KBUILD_EXTMOD 603 604else 605# Dummy target needed, because used as prerequisite 606include/config/auto.conf: ; 607endif # $(dot-config) 608 609# The all: target is the default when no target is given on the 610# command line. 611# This allow a user to issue only 'make' to build a kernel including modules 612# Defaults to vmlinux, but the arch makefile usually adds further targets 613all: vmlinux 614 615include $(srctree)/arch/$(SRCARCH)/Makefile 616 617KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 618 619ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 620KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 621else 622KBUILD_CFLAGS += -O2 623endif 624 625# Tell gcc to never replace conditional load with a non-conditional one 626KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 627 628ifdef CONFIG_READABLE_ASM 629# Disable optimizations that make assembler listings hard to read. 630# reorder blocks reorders the control in the function 631# ipa clone creates specialized cloned functions 632# partial inlining inlines only parts of functions 633KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 634 $(call cc-option,-fno-ipa-cp-clone,) \ 635 $(call cc-option,-fno-partial-inlining) 636endif 637 638ifneq ($(CONFIG_FRAME_WARN),0) 639KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 640endif 641 642# Handle stack protector mode. 643# 644# Since kbuild can potentially perform two passes (first with the old 645# .config values and then with updated .config values), we cannot error out 646# if a desired compiler option is unsupported. If we were to error, kbuild 647# could never get to the second pass and actually notice that we changed 648# the option to something that was supported. 649# 650# Additionally, we don't want to fallback and/or silently change which compiler 651# flags will be used, since that leads to producing kernels with different 652# security feature characteristics depending on the compiler used. ("But I 653# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 654# 655# The middle ground is to warn here so that the failed option is obvious, but 656# to let the build fail with bad compiler flags so that we can't produce a 657# kernel when there is a CONFIG and compiler mismatch. 658# 659ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 660 stackp-flag := -fstack-protector 661 ifeq ($(call cc-option, $(stackp-flag)),) 662 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 663 -fstack-protector not supported by compiler) 664 endif 665else 666ifdef CONFIG_CC_STACKPROTECTOR_STRONG 667 stackp-flag := -fstack-protector-strong 668 ifeq ($(call cc-option, $(stackp-flag)),) 669 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 670 -fstack-protector-strong not supported by compiler) 671 endif 672else 673 # Force off for distro compilers that enable stack protector by default. 674 stackp-flag := $(call cc-option, -fno-stack-protector) 675endif 676endif 677KBUILD_CFLAGS += $(stackp-flag) 678 679ifeq ($(COMPILER),clang) 680KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 681KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 682KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 683KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 684KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 685# Quiet clang warning: comparison of unsigned expression < 0 is always false 686KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 687# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 688# source of a reference will be _MergedGlobals and not on of the whitelisted names. 689# See modpost pattern 2 690KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 691KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 692else 693 694# This warning generated too much noise in a regular build. 695# Use make W=1 to enable this warning (see scripts/Makefile.build) 696KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 697endif 698 699ifdef CONFIG_FRAME_POINTER 700KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 701else 702# Some targets (ARM with Thumb2, for example), can't be built with frame 703# pointers. For those, we don't have FUNCTION_TRACER automatically 704# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 705# incompatible with -fomit-frame-pointer with current GCC, so we don't use 706# -fomit-frame-pointer with FUNCTION_TRACER. 707ifndef CONFIG_FUNCTION_TRACER 708KBUILD_CFLAGS += -fomit-frame-pointer 709endif 710endif 711 712KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 713 714ifdef CONFIG_DEBUG_INFO 715ifdef CONFIG_DEBUG_INFO_SPLIT 716KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 717else 718KBUILD_CFLAGS += -g 719endif 720KBUILD_AFLAGS += -Wa,-gdwarf-2 721endif 722ifdef CONFIG_DEBUG_INFO_DWARF4 723KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 724endif 725 726ifdef CONFIG_DEBUG_INFO_REDUCED 727KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 728 $(call cc-option,-fno-var-tracking) 729endif 730 731ifdef CONFIG_FUNCTION_TRACER 732ifdef CONFIG_HAVE_FENTRY 733CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 734endif 735KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 736KBUILD_AFLAGS += $(CC_USING_FENTRY) 737ifdef CONFIG_DYNAMIC_FTRACE 738 ifdef CONFIG_HAVE_C_RECORDMCOUNT 739 BUILD_C_RECORDMCOUNT := y 740 export BUILD_C_RECORDMCOUNT 741 endif 742endif 743endif 744 745# We trigger additional mismatches with less inlining 746ifdef CONFIG_DEBUG_SECTION_MISMATCH 747KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 748endif 749 750# arch Makefile may override CC so keep this after arch Makefile is included 751NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 752CHECKFLAGS += $(NOSTDINC_FLAGS) 753 754# warn about C99 declaration after statement 755KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 756 757# disable pointer signed / unsigned warnings in gcc 4.0 758KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 759 760# disable invalid "can't wrap" optimizations for signed / pointers 761KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 762 763# conserve stack if available 764KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 765 766# disallow errors like 'EXPORT_GPL(foo);' with missing header 767KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 768 769# require functions to have arguments in prototypes, not empty 'int foo()' 770KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 771 772# Prohibit date/time macros, which would make the build non-deterministic 773KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 774 775# use the deterministic mode of AR if available 776KBUILD_ARFLAGS := $(call ar-option,D) 777 778# check for 'asm goto' 779ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 780 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 781endif 782 783include $(srctree)/scripts/Makefile.extrawarn 784 785# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 786KBUILD_CPPFLAGS += $(KCPPFLAGS) 787KBUILD_AFLAGS += $(KAFLAGS) 788KBUILD_CFLAGS += $(KCFLAGS) 789 790# Use --build-id when available. 791LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 792 $(call cc-ldoption, -Wl$(comma)--build-id,)) 793KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 794LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 795 796ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 797LDFLAGS_vmlinux += $(call ld-option, -X,) 798endif 799 800# Default kernel image to build when no specific target is given. 801# KBUILD_IMAGE may be overruled on the command line or 802# set in the environment 803# Also any assignments in arch/$(ARCH)/Makefile take precedence over 804# this default value 805export KBUILD_IMAGE ?= vmlinux 806 807# 808# INSTALL_PATH specifies where to place the updated kernel and system map 809# images. Default is /boot, but you can set it to other values 810export INSTALL_PATH ?= /boot 811 812# 813# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 814# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 815# an argument if needed. Otherwise it defaults to the kernel install path 816# 817export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 818 819# 820# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 821# relocations required by build roots. This is not defined in the 822# makefile but the argument can be passed to make if needed. 823# 824 825MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 826export MODLIB 827 828# 829# INSTALL_MOD_STRIP, if defined, will cause modules to be 830# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 831# the default option --strip-debug will be used. Otherwise, 832# INSTALL_MOD_STRIP value will be used as the options to the strip command. 833 834ifdef INSTALL_MOD_STRIP 835ifeq ($(INSTALL_MOD_STRIP),1) 836mod_strip_cmd = $(STRIP) --strip-debug 837else 838mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 839endif # INSTALL_MOD_STRIP=1 840else 841mod_strip_cmd = true 842endif # INSTALL_MOD_STRIP 843export mod_strip_cmd 844 845# Select initial ramdisk compression format, default is gzip(1). 846# This shall be used by the dracut(8) tool while creating an initramfs image. 847# 848INITRD_COMPRESS-y := gzip 849INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 850INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 851INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 852INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 853INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 854# do not export INITRD_COMPRESS, since we didn't actually 855# choose a sane default compression above. 856# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 857 858ifdef CONFIG_MODULE_SIG_ALL 859MODSECKEY = ./signing_key.priv 860MODPUBKEY = ./signing_key.x509 861export MODPUBKEY 862mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 863else 864mod_sign_cmd = true 865endif 866export mod_sign_cmd 867 868 869ifeq ($(KBUILD_EXTMOD),) 870core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 871 872vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 873 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 874 $(net-y) $(net-m) $(libs-y) $(libs-m))) 875 876vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 877 $(init-n) $(init-) \ 878 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 879 $(net-n) $(net-) $(libs-n) $(libs-)))) 880 881init-y := $(patsubst %/, %/built-in.o, $(init-y)) 882core-y := $(patsubst %/, %/built-in.o, $(core-y)) 883drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 884net-y := $(patsubst %/, %/built-in.o, $(net-y)) 885libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 886libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 887libs-y := $(libs-y1) $(libs-y2) 888 889# Externally visible symbols (used by link-vmlinux.sh) 890export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 891export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 892export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 893export LDFLAGS_vmlinux 894# used by scripts/pacmage/Makefile 895export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 896 897vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 898 899# Final link of vmlinux 900 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 901quiet_cmd_link-vmlinux = LINK $@ 902 903# Include targets which we want to 904# execute if the rest of the kernel build went well. 905vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 906ifdef CONFIG_HEADERS_CHECK 907 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 908endif 909ifdef CONFIG_SAMPLES 910 $(Q)$(MAKE) $(build)=samples 911endif 912ifdef CONFIG_BUILD_DOCSRC 913 $(Q)$(MAKE) $(build)=Documentation 914endif 915 +$(call if_changed,link-vmlinux) 916 917# The actual objects are generated when descending, 918# make sure no implicit rule kicks in 919$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 920 921# Handle descending into subdirectories listed in $(vmlinux-dirs) 922# Preset locale variables to speed up the build process. Limit locale 923# tweaks to this spot to avoid wrong language settings when running 924# make menuconfig etc. 925# Error messages still appears in the original language 926 927PHONY += $(vmlinux-dirs) 928$(vmlinux-dirs): prepare scripts 929 $(Q)$(MAKE) $(build)=$@ 930 931define filechk_kernel.release 932 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 933endef 934 935# Store (new) KERNELRELEASE string in include/config/kernel.release 936include/config/kernel.release: include/config/auto.conf FORCE 937 $(call filechk,kernel.release) 938 939 940# Things we need to do before we recursively start building the kernel 941# or the modules are listed in "prepare". 942# A multi level approach is used. prepareN is processed before prepareN-1. 943# archprepare is used in arch Makefiles and when processed asm symlink, 944# version.h and scripts_basic is processed / created. 945 946# Listed in dependency order 947PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 948 949# prepare3 is used to check if we are building in a separate output directory, 950# and if so do: 951# 1) Check that make has not been executed in the kernel src $(srctree) 952prepare3: include/config/kernel.release 953ifneq ($(KBUILD_SRC),) 954 @$(kecho) ' Using $(srctree) as source for kernel' 955 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 956 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 957 echo >&2 " in the '$(srctree)' directory.";\ 958 /bin/false; \ 959 fi; 960endif 961 962# prepare2 creates a makefile if using a separate output directory 963prepare2: prepare3 outputmakefile asm-generic 964 965prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 966 include/config/auto.conf 967 $(cmd_crmodverdir) 968 969archprepare: archheaders archscripts prepare1 scripts_basic 970 971prepare0: archprepare FORCE 972 $(Q)$(MAKE) $(build)=. 973 974# All the preparing.. 975prepare: prepare0 976 977# Generate some files 978# --------------------------------------------------------------------------- 979 980# KERNELRELEASE can change from a few different places, meaning version.h 981# needs to be updated, so this check is forced on all builds 982 983uts_len := 64 984define filechk_utsrelease.h 985 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 986 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 987 exit 1; \ 988 fi; \ 989 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 990endef 991 992define filechk_version.h 993 (echo \#define LINUX_VERSION_CODE $(shell \ 994 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 995 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 996endef 997 998$(version_h): $(srctree)/Makefile FORCE 999 $(call filechk,version.h) 1000 1001include/generated/utsrelease.h: include/config/kernel.release FORCE 1002 $(call filechk,utsrelease.h) 1003 1004PHONY += headerdep 1005headerdep: 1006 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1007 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1008 1009# --------------------------------------------------------------------------- 1010 1011PHONY += depend dep 1012depend dep: 1013 @echo '*** Warning: make $@ is unnecessary now.' 1014 1015# --------------------------------------------------------------------------- 1016# Firmware install 1017INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1018export INSTALL_FW_PATH 1019 1020PHONY += firmware_install 1021firmware_install: FORCE 1022 @mkdir -p $(objtree)/firmware 1023 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1024 1025# --------------------------------------------------------------------------- 1026# Kernel headers 1027 1028#Default location for installed headers 1029export INSTALL_HDR_PATH = $(objtree)/usr 1030 1031hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 1032 1033# If we do an all arch process set dst to asm-$(hdr-arch) 1034hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1035 1036PHONY += archheaders 1037archheaders: 1038 1039PHONY += archscripts 1040archscripts: 1041 1042PHONY += __headers 1043__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1044 $(Q)$(MAKE) $(build)=scripts build_unifdef 1045 1046PHONY += headers_install_all 1047headers_install_all: 1048 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1049 1050PHONY += headers_install 1051headers_install: __headers 1052 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1053 $(error Headers not exportable for the $(SRCARCH) architecture)) 1054 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1055 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1056 1057PHONY += headers_check_all 1058headers_check_all: headers_install_all 1059 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1060 1061PHONY += headers_check 1062headers_check: headers_install 1063 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1064 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1065 1066# --------------------------------------------------------------------------- 1067# Kernel selftest 1068 1069PHONY += kselftest 1070kselftest: 1071 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1072 1073# --------------------------------------------------------------------------- 1074# Modules 1075 1076ifdef CONFIG_MODULES 1077 1078# By default, build modules as well 1079 1080all: modules 1081 1082# Build modules 1083# 1084# A module can be listed more than once in obj-m resulting in 1085# duplicate lines in modules.order files. Those are removed 1086# using awk while concatenating to the final file. 1087 1088PHONY += modules 1089modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1090 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1091 @$(kecho) ' Building modules, stage 2.'; 1092 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1094 1095modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1096 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1097 1098%/modules.builtin: include/config/auto.conf 1099 $(Q)$(MAKE) $(modbuiltin)=$* 1100 1101 1102# Target to prepare building external modules 1103PHONY += modules_prepare 1104modules_prepare: prepare scripts 1105 1106# Target to install modules 1107PHONY += modules_install 1108modules_install: _modinst_ _modinst_post 1109 1110PHONY += _modinst_ 1111_modinst_: 1112 @rm -rf $(MODLIB)/kernel 1113 @rm -f $(MODLIB)/source 1114 @mkdir -p $(MODLIB)/kernel 1115 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1116 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1117 rm -f $(MODLIB)/build ; \ 1118 ln -s $(CURDIR) $(MODLIB)/build ; \ 1119 fi 1120 @cp -f $(objtree)/modules.order $(MODLIB)/ 1121 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1122 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1123 1124# This depmod is only for convenience to give the initial 1125# boot a modules.dep even before / is mounted read-write. However the 1126# boot script depmod is the master version. 1127PHONY += _modinst_post 1128_modinst_post: _modinst_ 1129 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1130 $(call cmd,depmod) 1131 1132ifeq ($(CONFIG_MODULE_SIG), y) 1133PHONY += modules_sign 1134modules_sign: 1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1136endif 1137 1138else # CONFIG_MODULES 1139 1140# Modules not configured 1141# --------------------------------------------------------------------------- 1142 1143modules modules_install: FORCE 1144 @echo >&2 1145 @echo >&2 "The present kernel configuration has modules disabled." 1146 @echo >&2 "Type 'make config' and enable loadable module support." 1147 @echo >&2 "Then build a kernel with module support enabled." 1148 @echo >&2 1149 @exit 1 1150 1151endif # CONFIG_MODULES 1152 1153### 1154# Cleaning is done on three levels. 1155# make clean Delete most generated files 1156# Leave enough to build external modules 1157# make mrproper Delete the current configuration, and all generated files 1158# make distclean Remove editor backup files, patch leftover files and the like 1159 1160# Directories & files removed with 'make clean' 1161CLEAN_DIRS += $(MODVERDIR) 1162 1163# Directories & files removed with 'make mrproper' 1164MRPROPER_DIRS += include/config usr/include include/generated \ 1165 arch/*/include/generated .tmp_objdiff 1166MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1167 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1168 signing_key.priv signing_key.x509 x509.genkey \ 1169 extra_certificates signing_key.x509.keyid \ 1170 signing_key.x509.signer include/linux/version.h 1171 1172# clean - Delete most, but leave enough to build external modules 1173# 1174clean: rm-dirs := $(CLEAN_DIRS) 1175clean: rm-files := $(CLEAN_FILES) 1176clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1177 1178PHONY += $(clean-dirs) clean archclean vmlinuxclean 1179$(clean-dirs): 1180 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1181 1182vmlinuxclean: 1183 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1184 1185clean: archclean vmlinuxclean 1186 1187# mrproper - Delete all generated files, including .config 1188# 1189mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1190mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1191mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1192 1193PHONY += $(mrproper-dirs) mrproper archmrproper 1194$(mrproper-dirs): 1195 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1196 1197mrproper: clean archmrproper $(mrproper-dirs) 1198 $(call cmd,rmdirs) 1199 $(call cmd,rmfiles) 1200 1201# distclean 1202# 1203PHONY += distclean 1204 1205distclean: mrproper 1206 @find $(srctree) $(RCS_FIND_IGNORE) \ 1207 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1208 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1209 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1210 -type f -print | xargs rm -f 1211 1212 1213# Packaging of the kernel to various formats 1214# --------------------------------------------------------------------------- 1215# rpm target kept for backward compatibility 1216package-dir := scripts/package 1217 1218%src-pkg: FORCE 1219 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1220%pkg: include/config/kernel.release FORCE 1221 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1222rpm: include/config/kernel.release FORCE 1223 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1224 1225 1226# Brief documentation of the typical targets used 1227# --------------------------------------------------------------------------- 1228 1229boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1230boards := $(notdir $(boards)) 1231board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1232board-dirs := $(sort $(notdir $(board-dirs:/=))) 1233 1234help: 1235 @echo 'Cleaning targets:' 1236 @echo ' clean - Remove most generated files but keep the config and' 1237 @echo ' enough build support to build external modules' 1238 @echo ' mrproper - Remove all generated files + config + various backup files' 1239 @echo ' distclean - mrproper + remove editor backup and patch files' 1240 @echo '' 1241 @echo 'Configuration targets:' 1242 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1243 @echo '' 1244 @echo 'Other generic targets:' 1245 @echo ' all - Build all targets marked with [*]' 1246 @echo '* vmlinux - Build the bare kernel' 1247 @echo '* modules - Build all modules' 1248 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1249 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1250 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1251 @echo ' dir/ - Build all files in dir and below' 1252 @echo ' dir/file.[oisS] - Build specified target only' 1253 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1254 @echo ' (requires a recent binutils and recent build (System.map))' 1255 @echo ' dir/file.ko - Build module including final link' 1256 @echo ' modules_prepare - Set up for building external modules' 1257 @echo ' tags/TAGS - Generate tags file for editors' 1258 @echo ' cscope - Generate cscope index' 1259 @echo ' gtags - Generate GNU GLOBAL index' 1260 @echo ' kernelrelease - Output the release version string (use with make -s)' 1261 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1262 @echo ' image_name - Output the image name (use with make -s)' 1263 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1264 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1265 echo '' 1266 @echo 'Static analysers' 1267 @echo ' checkstack - Generate a list of stack hogs' 1268 @echo ' namespacecheck - Name space analysis on compiled kernel' 1269 @echo ' versioncheck - Sanity check on version.h usage' 1270 @echo ' includecheck - Check for duplicate included header files' 1271 @echo ' export_report - List the usages of all exported symbols' 1272 @echo ' headers_check - Sanity check on exported headers' 1273 @echo ' headerdep - Detect inclusion cycles in headers' 1274 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1275 @echo '' 1276 @echo 'Kernel selftest' 1277 @echo ' kselftest - Build and run kernel selftest (run as root)' 1278 @echo ' Build, install, and boot kernel before' 1279 @echo ' running kselftest on it' 1280 @echo '' 1281 @echo 'Kernel packaging:' 1282 @$(MAKE) $(build)=$(package-dir) help 1283 @echo '' 1284 @echo 'Documentation targets:' 1285 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1286 @echo '' 1287 @echo 'Architecture specific targets ($(SRCARCH)):' 1288 @$(if $(archhelp),$(archhelp),\ 1289 echo ' No architecture specific help defined for $(SRCARCH)') 1290 @echo '' 1291 @$(if $(boards), \ 1292 $(foreach b, $(boards), \ 1293 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1294 echo '') 1295 @$(if $(board-dirs), \ 1296 $(foreach b, $(board-dirs), \ 1297 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1298 printf " %-16s - Show all of the above\\n" help-boards; \ 1299 echo '') 1300 1301 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1302 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1303 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1304 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1305 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1306 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1307 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1308 @echo ' 1: warnings which may be relevant and do not occur too often' 1309 @echo ' 2: warnings which occur quite often but may still be relevant' 1310 @echo ' 3: more obscure warnings, can most likely be ignored' 1311 @echo ' Multiple levels can be combined with W=12 or W=123' 1312 @echo '' 1313 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1314 @echo 'For further info see the ./README file' 1315 1316 1317help-board-dirs := $(addprefix help-,$(board-dirs)) 1318 1319help-boards: $(help-board-dirs) 1320 1321boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1322 1323$(help-board-dirs): help-%: 1324 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1325 @$(if $(boards-per-dir), \ 1326 $(foreach b, $(boards-per-dir), \ 1327 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1328 echo '') 1329 1330 1331# Documentation targets 1332# --------------------------------------------------------------------------- 1333%docs: scripts_basic FORCE 1334 $(Q)$(MAKE) $(build)=scripts build_docproc 1335 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1336 1337else # KBUILD_EXTMOD 1338 1339### 1340# External module support. 1341# When building external modules the kernel used as basis is considered 1342# read-only, and no consistency checks are made and the make 1343# system is not used on the basis kernel. If updates are required 1344# in the basis kernel ordinary make commands (without M=...) must 1345# be used. 1346# 1347# The following are the only valid targets when building external 1348# modules. 1349# make M=dir clean Delete all automatically generated files 1350# make M=dir modules Make all modules in specified dir 1351# make M=dir Same as 'make M=dir modules' 1352# make M=dir modules_install 1353# Install the modules built in the module directory 1354# Assumes install directory is already created 1355 1356# We are always building modules 1357KBUILD_MODULES := 1 1358PHONY += crmodverdir 1359crmodverdir: 1360 $(cmd_crmodverdir) 1361 1362PHONY += $(objtree)/Module.symvers 1363$(objtree)/Module.symvers: 1364 @test -e $(objtree)/Module.symvers || ( \ 1365 echo; \ 1366 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1367 echo " is missing; modules will have no dependencies and modversions."; \ 1368 echo ) 1369 1370module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1371PHONY += $(module-dirs) modules 1372$(module-dirs): crmodverdir $(objtree)/Module.symvers 1373 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1374 1375modules: $(module-dirs) 1376 @$(kecho) ' Building modules, stage 2.'; 1377 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1378 1379PHONY += modules_install 1380modules_install: _emodinst_ _emodinst_post 1381 1382install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1383PHONY += _emodinst_ 1384_emodinst_: 1385 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1386 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1387 1388PHONY += _emodinst_post 1389_emodinst_post: _emodinst_ 1390 $(call cmd,depmod) 1391 1392clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1393 1394PHONY += $(clean-dirs) clean 1395$(clean-dirs): 1396 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1397 1398clean: rm-dirs := $(MODVERDIR) 1399clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1400 1401help: 1402 @echo ' Building external modules.' 1403 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1404 @echo '' 1405 @echo ' modules - default target, build the module(s)' 1406 @echo ' modules_install - install the module' 1407 @echo ' clean - remove generated files in module directory only' 1408 @echo '' 1409 1410# Dummies... 1411PHONY += prepare scripts 1412prepare: ; 1413scripts: ; 1414endif # KBUILD_EXTMOD 1415 1416clean: $(clean-dirs) 1417 $(call cmd,rmdirs) 1418 $(call cmd,rmfiles) 1419 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1420 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1421 -o -name '*.ko.*' \ 1422 -o -name '*.dwo' \ 1423 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1424 -o -name '*.symtypes' -o -name 'modules.order' \ 1425 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1426 -o -name '*.gcno' \) -type f -print | xargs rm -f 1427 1428# Generate tags for editors 1429# --------------------------------------------------------------------------- 1430quiet_cmd_tags = GEN $@ 1431 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1432 1433tags TAGS cscope gtags: FORCE 1434 $(call cmd,tags) 1435 1436# Scripts to check various things for consistency 1437# --------------------------------------------------------------------------- 1438 1439PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1440 1441includecheck: 1442 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1443 -name '*.[hcS]' -type f -print | sort \ 1444 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1445 1446versioncheck: 1447 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1448 -name '*.[hcS]' -type f -print | sort \ 1449 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1450 1451coccicheck: 1452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1453 1454namespacecheck: 1455 $(PERL) $(srctree)/scripts/namespace.pl 1456 1457export_report: 1458 $(PERL) $(srctree)/scripts/export_report.pl 1459 1460endif #ifeq ($(config-targets),1) 1461endif #ifeq ($(mixed-targets),1) 1462 1463PHONY += checkstack kernelrelease kernelversion image_name 1464 1465# UML needs a little special treatment here. It wants to use the host 1466# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1467# else wants $(ARCH), including people doing cross-builds, which means 1468# that $(SUBARCH) doesn't work here. 1469ifeq ($(ARCH), um) 1470CHECKSTACK_ARCH := $(SUBARCH) 1471else 1472CHECKSTACK_ARCH := $(ARCH) 1473endif 1474checkstack: 1475 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1476 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1477 1478kernelrelease: 1479 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1480 1481kernelversion: 1482 @echo $(KERNELVERSION) 1483 1484image_name: 1485 @echo $(KBUILD_IMAGE) 1486 1487# Clear a bunch of variables before executing the submake 1488tools/: FORCE 1489 $(Q)mkdir -p $(objtree)/tools 1490 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1491 1492tools/%: FORCE 1493 $(Q)mkdir -p $(objtree)/tools 1494 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1495 1496# Single targets 1497# --------------------------------------------------------------------------- 1498# Single targets are compatible with: 1499# - build with mixed source and output 1500# - build with separate output dir 'make O=...' 1501# - external modules 1502# 1503# target-dir => where to store outputfile 1504# build-dir => directory in kernel source tree to use 1505 1506ifeq ($(KBUILD_EXTMOD),) 1507 build-dir = $(patsubst %/,%,$(dir $@)) 1508 target-dir = $(dir $@) 1509else 1510 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1511 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1512 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1513endif 1514 1515%.s: %.c prepare scripts FORCE 1516 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1517%.i: %.c prepare scripts FORCE 1518 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1519%.o: %.c prepare scripts FORCE 1520 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1521%.lst: %.c prepare scripts FORCE 1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1523%.s: %.S prepare scripts FORCE 1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1525%.o: %.S prepare scripts FORCE 1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1527%.symtypes: %.c prepare scripts FORCE 1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1529 1530# Modules 1531/: prepare scripts FORCE 1532 $(cmd_crmodverdir) 1533 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1534 $(build)=$(build-dir) 1535%/: prepare scripts FORCE 1536 $(cmd_crmodverdir) 1537 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1538 $(build)=$(build-dir) 1539%.ko: prepare scripts FORCE 1540 $(cmd_crmodverdir) 1541 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1542 $(build)=$(build-dir) $(@:.ko=.o) 1543 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1544 1545# FIXME Should go into a make.lib or something 1546# =========================================================================== 1547 1548quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1549 cmd_rmdirs = rm -rf $(rm-dirs) 1550 1551quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1552 cmd_rmfiles = rm -f $(rm-files) 1553 1554# Run depmod only if we have System.map and depmod is executable 1555quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1556 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1557 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1558 1559# Create temporary dir for module support files 1560# clean it up only when building all modules 1561cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1562 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1563 1564# read all saved command lines 1565 1566targets := $(wildcard $(sort $(targets))) 1567cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1568 1569ifneq ($(cmd_files),) 1570 $(cmd_files): ; # Do not try to update included dependency files 1571 include $(cmd_files) 1572endif 1573 1574# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1575# Usage: 1576# $(Q)$(MAKE) $(clean)=dir 1577clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1578 1579endif # skip-makefile 1580 1581PHONY += FORCE 1582FORCE: 1583 1584# Declare the contents of the .PHONY variable as phony. We keep that 1585# information in a variable so we can use it in if_changed and friends. 1586.PHONY: $(PHONY) 1587