1VERSION = 3 2PATCHLEVEL = 16 3SUBLEVEL = 0 4EXTRAVERSION = -rc3 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# To put more focus on warnings, be less verbose as default 45# Use 'make V=1' to see the full commands 46 47ifeq ("$(origin V)", "command line") 48 KBUILD_VERBOSE = $(V) 49endif 50ifndef KBUILD_VERBOSE 51 KBUILD_VERBOSE = 0 52endif 53 54# Call a source code checker (by default, "sparse") as part of the 55# C compilation. 56# 57# Use 'make C=1' to enable checking of only re-compiled files. 58# Use 'make C=2' to enable checking of *all* source files, regardless 59# of whether they are re-compiled or not. 60# 61# See the file "Documentation/sparse.txt" for more details, including 62# where to get the "sparse" utility. 63 64ifeq ("$(origin C)", "command line") 65 KBUILD_CHECKSRC = $(C) 66endif 67ifndef KBUILD_CHECKSRC 68 KBUILD_CHECKSRC = 0 69endif 70 71# Use make M=dir to specify directory of external module to build 72# Old syntax make ... SUBDIRS=$PWD is still supported 73# Setting the environment variable KBUILD_EXTMOD take precedence 74ifdef SUBDIRS 75 KBUILD_EXTMOD ?= $(SUBDIRS) 76endif 77 78ifeq ("$(origin M)", "command line") 79 KBUILD_EXTMOD := $(M) 80endif 81 82# kbuild supports saving output files in a separate directory. 83# To locate output files in a separate directory two syntaxes are supported. 84# In both cases the working directory must be the root of the kernel src. 85# 1) O= 86# Use "make O=dir/to/store/output/files/" 87# 88# 2) Set KBUILD_OUTPUT 89# Set the environment variable KBUILD_OUTPUT to point to the directory 90# where the output files shall be placed. 91# export KBUILD_OUTPUT=dir/to/store/output/files/ 92# make 93# 94# The O= assignment takes precedence over the KBUILD_OUTPUT environment 95# variable. 96 97 98# KBUILD_SRC is set on invocation of make in OBJ directory 99# KBUILD_SRC is not intended to be used by the regular user (for now) 100ifeq ($(KBUILD_SRC),) 101 102# OK, Make called in directory where kernel src resides 103# Do we want to locate output files in a separate directory? 104ifeq ("$(origin O)", "command line") 105 KBUILD_OUTPUT := $(O) 106endif 107 108# That's our default target when none is given on the command line 109PHONY := _all 110_all: 111 112# Cancel implicit rules on top Makefile 113$(CURDIR)/Makefile Makefile: ; 114 115ifneq ($(KBUILD_OUTPUT),) 116# Invoke a second make in the output directory, passing relevant variables 117# check that the output directory actually exists 118saved-output := $(KBUILD_OUTPUT) 119KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 120 && /bin/pwd) 121$(if $(KBUILD_OUTPUT),, \ 122 $(error failed to create output directory "$(saved-output)")) 123 124PHONY += $(MAKECMDGOALS) sub-make 125 126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 127 @: 128 129sub-make: FORCE 130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ 131 KBUILD_SRC=$(CURDIR) \ 132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \ 133 $(filter-out _all sub-make,$(MAKECMDGOALS)) 134 135# Leave processing to above invocation of make 136skip-makefile := 1 137endif # ifneq ($(KBUILD_OUTPUT),) 138endif # ifeq ($(KBUILD_SRC),) 139 140# We process the rest of the Makefile if this is the final invocation of make 141ifeq ($(skip-makefile),) 142 143# If building an external module we do not care about the all: rule 144# but instead _all depend on modules 145PHONY += all 146ifeq ($(KBUILD_EXTMOD),) 147_all: all 148else 149_all: modules 150endif 151 152ifeq ($(KBUILD_SRC),) 153 # building in the source tree 154 srctree := . 155else 156 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 157 # building in a subdirectory of the source tree 158 srctree := .. 159 else 160 srctree := $(KBUILD_SRC) 161 endif 162endif 163objtree := . 164src := $(srctree) 165obj := $(objtree) 166 167VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 168 169export srctree objtree VPATH 170 171 172# SUBARCH tells the usermode build what the underlying arch is. That is set 173# first, and if a usermode build is happening, the "ARCH=um" on the command 174# line overrides the setting of ARCH below. If a native build is happening, 175# then ARCH is assigned, getting whatever value it gets normally, and 176# SUBARCH is subsequently ignored. 177 178SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 179 -e s/sun4u/sparc64/ \ 180 -e s/arm.*/arm/ -e s/sa110/arm/ \ 181 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 182 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 183 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 184 185# Cross compiling and selecting different set of gcc/bin-utils 186# --------------------------------------------------------------------------- 187# 188# When performing cross compilation for other architectures ARCH shall be set 189# to the target architecture. (See arch/* for the possibilities). 190# ARCH can be set during invocation of make: 191# make ARCH=ia64 192# Another way is to have ARCH set in the environment. 193# The default ARCH is the host where make is executed. 194 195# CROSS_COMPILE specify the prefix used for all executables used 196# during compilation. Only gcc and related bin-utils executables 197# are prefixed with $(CROSS_COMPILE). 198# CROSS_COMPILE can be set on the command line 199# make CROSS_COMPILE=ia64-linux- 200# Alternatively CROSS_COMPILE can be set in the environment. 201# A third alternative is to store a setting in .config so that plain 202# "make" in the configured kernel build directory always uses that. 203# Default value for CROSS_COMPILE is not to prefix executables 204# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 205ARCH ?= $(SUBARCH) 206CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 207 208# Architecture as present in compile.h 209UTS_MACHINE := $(ARCH) 210SRCARCH := $(ARCH) 211 212# Additional ARCH settings for x86 213ifeq ($(ARCH),i386) 214 SRCARCH := x86 215endif 216ifeq ($(ARCH),x86_64) 217 SRCARCH := x86 218endif 219 220# Additional ARCH settings for sparc 221ifeq ($(ARCH),sparc32) 222 SRCARCH := sparc 223endif 224ifeq ($(ARCH),sparc64) 225 SRCARCH := sparc 226endif 227 228# Additional ARCH settings for sh 229ifeq ($(ARCH),sh64) 230 SRCARCH := sh 231endif 232 233# Additional ARCH settings for tile 234ifeq ($(ARCH),tilepro) 235 SRCARCH := tile 236endif 237ifeq ($(ARCH),tilegx) 238 SRCARCH := tile 239endif 240 241# Where to locate arch specific headers 242hdr-arch := $(SRCARCH) 243 244KCONFIG_CONFIG ?= .config 245export KCONFIG_CONFIG 246 247# SHELL used by kbuild 248CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 249 else if [ -x /bin/bash ]; then echo /bin/bash; \ 250 else echo sh; fi ; fi) 251 252HOSTCC = gcc 253HOSTCXX = g++ 254HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 255HOSTCXXFLAGS = -O2 256 257ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 258HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 259 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 260endif 261 262# Decide whether to build built-in, modular, or both. 263# Normally, just do built-in. 264 265KBUILD_MODULES := 266KBUILD_BUILTIN := 1 267 268# If we have only "make modules", don't compile built-in objects. 269# When we're building modules with modversions, we need to consider 270# the built-in objects during the descend as well, in order to 271# make sure the checksums are up to date before we record them. 272 273ifeq ($(MAKECMDGOALS),modules) 274 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 275endif 276 277# If we have "make <whatever> modules", compile modules 278# in addition to whatever we do anyway. 279# Just "make" or "make all" shall build modules as well 280 281ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 282 KBUILD_MODULES := 1 283endif 284 285ifeq ($(MAKECMDGOALS),) 286 KBUILD_MODULES := 1 287endif 288 289export KBUILD_MODULES KBUILD_BUILTIN 290export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 291 292# Beautify output 293# --------------------------------------------------------------------------- 294# 295# Normally, we echo the whole command before executing it. By making 296# that echo $($(quiet)$(cmd)), we now have the possibility to set 297# $(quiet) to choose other forms of output instead, e.g. 298# 299# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 300# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 301# 302# If $(quiet) is empty, the whole command will be printed. 303# If it is set to "quiet_", only the short version will be printed. 304# If it is set to "silent_", nothing will be printed at all, since 305# the variable $(silent_cmd_cc_o_c) doesn't exist. 306# 307# A simple variant is to prefix commands with $(Q) - that's useful 308# for commands that shall be hidden in non-verbose mode. 309# 310# $(Q)ln $@ :< 311# 312# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 313# If KBUILD_VERBOSE equals 1 then the above command is displayed. 314 315ifeq ($(KBUILD_VERBOSE),1) 316 quiet = 317 Q = 318else 319 quiet=quiet_ 320 Q = @ 321endif 322 323# If the user is running make -s (silent mode), suppress echoing of 324# commands 325 326ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 327ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 328 quiet=silent_ 329endif 330else # make-3.8x 331ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 332 quiet=silent_ 333endif 334endif 335 336export quiet Q KBUILD_VERBOSE 337 338ifneq ($(CC),) 339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 340COMPILER := clang 341else 342COMPILER := gcc 343endif 344export COMPILER 345endif 346 347# Look for make include files relative to root of kernel src 348MAKEFLAGS += --include-dir=$(srctree) 349 350# We need some generic definitions (do not try to remake the file). 351$(srctree)/scripts/Kbuild.include: ; 352include $(srctree)/scripts/Kbuild.include 353 354# Make variables (CC, etc...) 355AS = $(CROSS_COMPILE)as 356LD = $(CROSS_COMPILE)ld 357CC = $(CROSS_COMPILE)gcc 358CPP = $(CC) -E 359AR = $(CROSS_COMPILE)ar 360NM = $(CROSS_COMPILE)nm 361STRIP = $(CROSS_COMPILE)strip 362OBJCOPY = $(CROSS_COMPILE)objcopy 363OBJDUMP = $(CROSS_COMPILE)objdump 364AWK = awk 365GENKSYMS = scripts/genksyms/genksyms 366INSTALLKERNEL := installkernel 367DEPMOD = /sbin/depmod 368PERL = perl 369CHECK = sparse 370 371CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 372 -Wbitwise -Wno-return-void $(CF) 373CFLAGS_MODULE = 374AFLAGS_MODULE = 375LDFLAGS_MODULE = 376CFLAGS_KERNEL = 377AFLAGS_KERNEL = 378CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 379 380 381# Use USERINCLUDE when you must reference the UAPI directories only. 382USERINCLUDE := \ 383 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 384 -Iarch/$(hdr-arch)/include/generated/uapi \ 385 -I$(srctree)/include/uapi \ 386 -Iinclude/generated/uapi \ 387 -include $(srctree)/include/linux/kconfig.h 388 389# Use LINUXINCLUDE when you must reference the include/ directory. 390# Needed to be compatible with the O= option 391LINUXINCLUDE := \ 392 -I$(srctree)/arch/$(hdr-arch)/include \ 393 -Iarch/$(hdr-arch)/include/generated \ 394 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 395 -Iinclude \ 396 $(USERINCLUDE) 397 398KBUILD_CPPFLAGS := -D__KERNEL__ 399 400KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 401 -fno-strict-aliasing -fno-common \ 402 -Werror-implicit-function-declaration \ 403 -Wno-format-security 404 405KBUILD_AFLAGS_KERNEL := 406KBUILD_CFLAGS_KERNEL := 407KBUILD_AFLAGS := -D__ASSEMBLY__ 408KBUILD_AFLAGS_MODULE := -DMODULE 409KBUILD_CFLAGS_MODULE := -DMODULE 410KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 411 412# Read KERNELRELEASE from include/config/kernel.release (if it exists) 413KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 414KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 415 416export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 417export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 418export CPP AR NM STRIP OBJCOPY OBJDUMP 419export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE 420export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 421 422export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 423export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 424export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 425export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 426export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 427export KBUILD_ARFLAGS 428 429# When compiling out-of-tree modules, put MODVERDIR in the module 430# tree rather than in the kernel tree. The kernel tree might 431# even be read-only. 432export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 433 434# Files to ignore in find ... statements 435 436export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 437 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 438 -prune -o 439export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 440 --exclude CVS --exclude .pc --exclude .hg --exclude .git 441 442# =========================================================================== 443# Rules shared between *config targets and build targets 444 445# Basic helpers built in scripts/ 446PHONY += scripts_basic 447scripts_basic: 448 $(Q)$(MAKE) $(build)=scripts/basic 449 $(Q)rm -f .tmp_quiet_recordmcount 450 451# To avoid any implicit rule to kick in, define an empty command. 452scripts/basic/%: scripts_basic ; 453 454PHONY += outputmakefile 455# outputmakefile generates a Makefile in the output directory, if using a 456# separate output directory. This allows convenient use of make in the 457# output directory. 458outputmakefile: 459ifneq ($(KBUILD_SRC),) 460 $(Q)ln -fsn $(srctree) source 461 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 462 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 463endif 464 465# Support for using generic headers in asm-generic 466PHONY += asm-generic 467asm-generic: 468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 469 src=asm obj=arch/$(SRCARCH)/include/generated/asm 470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 471 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 472 473# To make sure we do not include .config for any of the *config targets 474# catch them early, and hand them over to scripts/kconfig/Makefile 475# It is allowed to specify more targets when calling make, including 476# mixing *config targets and build targets. 477# For example 'make oldconfig all'. 478# Detect when mixed targets is specified, and make a second invocation 479# of make so .config is not included in this case either (for *config). 480 481version_h := include/generated/uapi/linux/version.h 482 483no-dot-config-targets := clean mrproper distclean \ 484 cscope gtags TAGS tags help %docs check% coccicheck \ 485 $(version_h) headers_% archheaders archscripts \ 486 kernelversion %src-pkg 487 488config-targets := 0 489mixed-targets := 0 490dot-config := 1 491 492ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 493 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 494 dot-config := 0 495 endif 496endif 497 498ifeq ($(KBUILD_EXTMOD),) 499 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 500 config-targets := 1 501 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 502 mixed-targets := 1 503 endif 504 endif 505endif 506 507ifeq ($(mixed-targets),1) 508# =========================================================================== 509# We're called with mixed targets (*config and build targets). 510# Handle them one by one. 511 512PHONY += $(MAKECMDGOALS) __build_one_by_one 513 514$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 515 @: 516 517__build_one_by_one: 518 $(Q)set -e; \ 519 for i in $(MAKECMDGOALS); do \ 520 $(MAKE) -f $(srctree)/Makefile $$i; \ 521 done 522 523else 524ifeq ($(config-targets),1) 525# =========================================================================== 526# *config targets only - make sure prerequisites are updated, and descend 527# in scripts/kconfig to make the *config target 528 529# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 530# KBUILD_DEFCONFIG may point out an alternative default configuration 531# used for 'make defconfig' 532include $(srctree)/arch/$(SRCARCH)/Makefile 533export KBUILD_DEFCONFIG KBUILD_KCONFIG 534 535config: scripts_basic outputmakefile FORCE 536 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 537 538%config: scripts_basic outputmakefile FORCE 539 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 540 541else 542# =========================================================================== 543# Build targets only - this includes vmlinux, arch specific targets, clean 544# targets and others. In general all targets except *config targets. 545 546ifeq ($(KBUILD_EXTMOD),) 547# Additional helpers built in scripts/ 548# Carefully list dependencies so we do not try to build scripts twice 549# in parallel 550PHONY += scripts 551scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 552 asm-generic 553 $(Q)$(MAKE) $(build)=$(@) 554 555# Objects we will link into vmlinux / subdirs we need to visit 556init-y := init/ 557drivers-y := drivers/ sound/ firmware/ 558net-y := net/ 559libs-y := lib/ 560core-y := usr/ 561endif # KBUILD_EXTMOD 562 563ifeq ($(dot-config),1) 564# Read in config 565-include include/config/auto.conf 566 567ifeq ($(KBUILD_EXTMOD),) 568# Read in dependencies to all Kconfig* files, make sure to run 569# oldconfig if changes are detected. 570-include include/config/auto.conf.cmd 571 572# To avoid any implicit rule to kick in, define an empty command 573$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 574 575# If .config is newer than include/config/auto.conf, someone tinkered 576# with it and forgot to run make oldconfig. 577# if auto.conf.cmd is missing then we are probably in a cleaned tree so 578# we execute the config step to be sure to catch updated Kconfig files 579include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 580 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 581else 582# external modules needs include/generated/autoconf.h and include/config/auto.conf 583# but do not care if they are up-to-date. Use auto.conf to trigger the test 584PHONY += include/config/auto.conf 585 586include/config/auto.conf: 587 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 588 echo >&2; \ 589 echo >&2 " ERROR: Kernel configuration is invalid."; \ 590 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 591 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 592 echo >&2 ; \ 593 /bin/false) 594 595endif # KBUILD_EXTMOD 596 597else 598# Dummy target needed, because used as prerequisite 599include/config/auto.conf: ; 600endif # $(dot-config) 601 602# The all: target is the default when no target is given on the 603# command line. 604# This allow a user to issue only 'make' to build a kernel including modules 605# Defaults to vmlinux, but the arch makefile usually adds further targets 606all: vmlinux 607 608include $(srctree)/arch/$(SRCARCH)/Makefile 609 610KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 611 612ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 613KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 614else 615KBUILD_CFLAGS += -O2 616endif 617 618ifdef CONFIG_READABLE_ASM 619# Disable optimizations that make assembler listings hard to read. 620# reorder blocks reorders the control in the function 621# ipa clone creates specialized cloned functions 622# partial inlining inlines only parts of functions 623KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 624 $(call cc-option,-fno-ipa-cp-clone,) \ 625 $(call cc-option,-fno-partial-inlining) 626endif 627 628ifneq ($(CONFIG_FRAME_WARN),0) 629KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 630endif 631 632# Handle stack protector mode. 633ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 634 stackp-flag := -fstack-protector 635 ifeq ($(call cc-option, $(stackp-flag)),) 636 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 637 -fstack-protector not supported by compiler) 638 endif 639else 640ifdef CONFIG_CC_STACKPROTECTOR_STRONG 641 stackp-flag := -fstack-protector-strong 642 ifeq ($(call cc-option, $(stackp-flag)),) 643 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 644 -fstack-protector-strong not supported by compiler) 645 endif 646else 647 # Force off for distro compilers that enable stack protector by default. 648 stackp-flag := $(call cc-option, -fno-stack-protector) 649endif 650endif 651KBUILD_CFLAGS += $(stackp-flag) 652 653ifeq ($(COMPILER),clang) 654KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 655KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 656KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 657KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 658KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 659# Quiet clang warning: comparison of unsigned expression < 0 is always false 660KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 661# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 662# source of a reference will be _MergedGlobals and not on of the whitelisted names. 663# See modpost pattern 2 664KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 665else 666 667# This warning generated too much noise in a regular build. 668# Use make W=1 to enable this warning (see scripts/Makefile.build) 669KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 670endif 671 672ifdef CONFIG_FRAME_POINTER 673KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 674else 675# Some targets (ARM with Thumb2, for example), can't be built with frame 676# pointers. For those, we don't have FUNCTION_TRACER automatically 677# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 678# incompatible with -fomit-frame-pointer with current GCC, so we don't use 679# -fomit-frame-pointer with FUNCTION_TRACER. 680ifndef CONFIG_FUNCTION_TRACER 681KBUILD_CFLAGS += -fomit-frame-pointer 682endif 683endif 684 685ifdef CONFIG_DEBUG_INFO 686KBUILD_CFLAGS += -g 687KBUILD_AFLAGS += -Wa,-gdwarf-2 688endif 689 690ifdef CONFIG_DEBUG_INFO_REDUCED 691KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 692 $(call cc-option,-fno-var-tracking) 693endif 694 695ifdef CONFIG_FUNCTION_TRACER 696ifdef CONFIG_HAVE_FENTRY 697CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 698endif 699KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 700KBUILD_AFLAGS += $(CC_USING_FENTRY) 701ifdef CONFIG_DYNAMIC_FTRACE 702 ifdef CONFIG_HAVE_C_RECORDMCOUNT 703 BUILD_C_RECORDMCOUNT := y 704 export BUILD_C_RECORDMCOUNT 705 endif 706endif 707endif 708 709# We trigger additional mismatches with less inlining 710ifdef CONFIG_DEBUG_SECTION_MISMATCH 711KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 712endif 713 714# arch Makefile may override CC so keep this after arch Makefile is included 715NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 716CHECKFLAGS += $(NOSTDINC_FLAGS) 717 718# warn about C99 declaration after statement 719KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 720 721# disable pointer signed / unsigned warnings in gcc 4.0 722KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 723 724# disable invalid "can't wrap" optimizations for signed / pointers 725KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 726 727# conserve stack if available 728KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 729 730# disallow errors like 'EXPORT_GPL(foo);' with missing header 731KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 732 733# require functions to have arguments in prototypes, not empty 'int foo()' 734KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 735 736# Prohibit date/time macros, which would make the build non-deterministic 737KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 738 739# use the deterministic mode of AR if available 740KBUILD_ARFLAGS := $(call ar-option,D) 741 742# check for 'asm goto' 743ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 744 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 745endif 746 747include $(srctree)/scripts/Makefile.extrawarn 748 749# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 750KBUILD_CPPFLAGS += $(KCPPFLAGS) 751KBUILD_AFLAGS += $(KAFLAGS) 752KBUILD_CFLAGS += $(KCFLAGS) 753 754# Use --build-id when available. 755LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 756 $(call cc-ldoption, -Wl$(comma)--build-id,)) 757KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 758LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 759 760ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 761LDFLAGS_vmlinux += $(call ld-option, -X,) 762endif 763 764# Default kernel image to build when no specific target is given. 765# KBUILD_IMAGE may be overruled on the command line or 766# set in the environment 767# Also any assignments in arch/$(ARCH)/Makefile take precedence over 768# this default value 769export KBUILD_IMAGE ?= vmlinux 770 771# 772# INSTALL_PATH specifies where to place the updated kernel and system map 773# images. Default is /boot, but you can set it to other values 774export INSTALL_PATH ?= /boot 775 776# 777# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 778# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 779# an argument if needed. Otherwise it defaults to the kernel install path 780# 781export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 782 783# 784# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 785# relocations required by build roots. This is not defined in the 786# makefile but the argument can be passed to make if needed. 787# 788 789MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 790export MODLIB 791 792# 793# INSTALL_MOD_STRIP, if defined, will cause modules to be 794# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 795# the default option --strip-debug will be used. Otherwise, 796# INSTALL_MOD_STRIP value will be used as the options to the strip command. 797 798ifdef INSTALL_MOD_STRIP 799ifeq ($(INSTALL_MOD_STRIP),1) 800mod_strip_cmd = $(STRIP) --strip-debug 801else 802mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 803endif # INSTALL_MOD_STRIP=1 804else 805mod_strip_cmd = true 806endif # INSTALL_MOD_STRIP 807export mod_strip_cmd 808 809# Select initial ramdisk compression format, default is gzip(1). 810# This shall be used by the dracut(8) tool while creating an initramfs image. 811# 812INITRD_COMPRESS-y := gzip 813INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 814INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 815INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 816INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 817INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 818# do not export INITRD_COMPRESS, since we didn't actually 819# choose a sane default compression above. 820# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 821 822ifdef CONFIG_MODULE_SIG_ALL 823MODSECKEY = ./signing_key.priv 824MODPUBKEY = ./signing_key.x509 825export MODPUBKEY 826mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 827else 828mod_sign_cmd = true 829endif 830export mod_sign_cmd 831 832 833ifeq ($(KBUILD_EXTMOD),) 834core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 835 836vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 837 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 838 $(net-y) $(net-m) $(libs-y) $(libs-m))) 839 840vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 841 $(init-n) $(init-) \ 842 $(core-n) $(core-) $(drivers-n) $(drivers-) \ 843 $(net-n) $(net-) $(libs-n) $(libs-)))) 844 845init-y := $(patsubst %/, %/built-in.o, $(init-y)) 846core-y := $(patsubst %/, %/built-in.o, $(core-y)) 847drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 848net-y := $(patsubst %/, %/built-in.o, $(net-y)) 849libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 850libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 851libs-y := $(libs-y1) $(libs-y2) 852 853# Externally visible symbols (used by link-vmlinux.sh) 854export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 855export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 856export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 857export LDFLAGS_vmlinux 858# used by scripts/pacmage/Makefile 859export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 860 861vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 862 863# Final link of vmlinux 864 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 865quiet_cmd_link-vmlinux = LINK $@ 866 867# Include targets which we want to 868# execute if the rest of the kernel build went well. 869vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 870ifdef CONFIG_HEADERS_CHECK 871 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 872endif 873ifdef CONFIG_SAMPLES 874 $(Q)$(MAKE) $(build)=samples 875endif 876ifdef CONFIG_BUILD_DOCSRC 877 $(Q)$(MAKE) $(build)=Documentation 878endif 879 +$(call if_changed,link-vmlinux) 880 881# The actual objects are generated when descending, 882# make sure no implicit rule kicks in 883$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 884 885# Handle descending into subdirectories listed in $(vmlinux-dirs) 886# Preset locale variables to speed up the build process. Limit locale 887# tweaks to this spot to avoid wrong language settings when running 888# make menuconfig etc. 889# Error messages still appears in the original language 890 891PHONY += $(vmlinux-dirs) 892$(vmlinux-dirs): prepare scripts 893 $(Q)$(MAKE) $(build)=$@ 894 895define filechk_kernel.release 896 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 897endef 898 899# Store (new) KERNELRELEASE string in include/config/kernel.release 900include/config/kernel.release: include/config/auto.conf FORCE 901 $(call filechk,kernel.release) 902 903 904# Things we need to do before we recursively start building the kernel 905# or the modules are listed in "prepare". 906# A multi level approach is used. prepareN is processed before prepareN-1. 907# archprepare is used in arch Makefiles and when processed asm symlink, 908# version.h and scripts_basic is processed / created. 909 910# Listed in dependency order 911PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 912 913# prepare3 is used to check if we are building in a separate output directory, 914# and if so do: 915# 1) Check that make has not been executed in the kernel src $(srctree) 916prepare3: include/config/kernel.release 917ifneq ($(KBUILD_SRC),) 918 @$(kecho) ' Using $(srctree) as source for kernel' 919 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 920 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 921 echo >&2 " in the '$(srctree)' directory.";\ 922 /bin/false; \ 923 fi; 924endif 925 926# prepare2 creates a makefile if using a separate output directory 927prepare2: prepare3 outputmakefile asm-generic 928 929prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 930 include/config/auto.conf 931 $(cmd_crmodverdir) 932 933archprepare: archheaders archscripts prepare1 scripts_basic 934 935prepare0: archprepare FORCE 936 $(Q)$(MAKE) $(build)=. 937 938# All the preparing.. 939prepare: prepare0 940 941# Generate some files 942# --------------------------------------------------------------------------- 943 944# KERNELRELEASE can change from a few different places, meaning version.h 945# needs to be updated, so this check is forced on all builds 946 947uts_len := 64 948define filechk_utsrelease.h 949 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 950 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 951 exit 1; \ 952 fi; \ 953 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 954endef 955 956define filechk_version.h 957 (echo \#define LINUX_VERSION_CODE $(shell \ 958 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 959 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 960endef 961 962$(version_h): $(srctree)/Makefile FORCE 963 $(call filechk,version.h) 964 965include/generated/utsrelease.h: include/config/kernel.release FORCE 966 $(call filechk,utsrelease.h) 967 968PHONY += headerdep 969headerdep: 970 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 971 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 972 973# --------------------------------------------------------------------------- 974 975PHONY += depend dep 976depend dep: 977 @echo '*** Warning: make $@ is unnecessary now.' 978 979# --------------------------------------------------------------------------- 980# Firmware install 981INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 982export INSTALL_FW_PATH 983 984PHONY += firmware_install 985firmware_install: FORCE 986 @mkdir -p $(objtree)/firmware 987 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 988 989# --------------------------------------------------------------------------- 990# Kernel headers 991 992#Default location for installed headers 993export INSTALL_HDR_PATH = $(objtree)/usr 994 995hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 996 997# If we do an all arch process set dst to asm-$(hdr-arch) 998hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 999 1000PHONY += archheaders 1001archheaders: 1002 1003PHONY += archscripts 1004archscripts: 1005 1006PHONY += __headers 1007__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1008 $(Q)$(MAKE) $(build)=scripts build_unifdef 1009 1010PHONY += headers_install_all 1011headers_install_all: 1012 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1013 1014PHONY += headers_install 1015headers_install: __headers 1016 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1017 $(error Headers not exportable for the $(SRCARCH) architecture)) 1018 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1019 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1020 1021PHONY += headers_check_all 1022headers_check_all: headers_install_all 1023 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1024 1025PHONY += headers_check 1026headers_check: headers_install 1027 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1028 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1029 1030# --------------------------------------------------------------------------- 1031# Modules 1032 1033ifdef CONFIG_MODULES 1034 1035# By default, build modules as well 1036 1037all: modules 1038 1039# Build modules 1040# 1041# A module can be listed more than once in obj-m resulting in 1042# duplicate lines in modules.order files. Those are removed 1043# using awk while concatenating to the final file. 1044 1045PHONY += modules 1046modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1047 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1048 @$(kecho) ' Building modules, stage 2.'; 1049 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1050 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1051 1052modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1053 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1054 1055%/modules.builtin: include/config/auto.conf 1056 $(Q)$(MAKE) $(modbuiltin)=$* 1057 1058 1059# Target to prepare building external modules 1060PHONY += modules_prepare 1061modules_prepare: prepare scripts 1062 1063# Target to install modules 1064PHONY += modules_install 1065modules_install: _modinst_ _modinst_post 1066 1067PHONY += _modinst_ 1068_modinst_: 1069 @rm -rf $(MODLIB)/kernel 1070 @rm -f $(MODLIB)/source 1071 @mkdir -p $(MODLIB)/kernel 1072 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1073 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1074 rm -f $(MODLIB)/build ; \ 1075 ln -s $(CURDIR) $(MODLIB)/build ; \ 1076 fi 1077 @cp -f $(objtree)/modules.order $(MODLIB)/ 1078 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1079 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1080 1081# This depmod is only for convenience to give the initial 1082# boot a modules.dep even before / is mounted read-write. However the 1083# boot script depmod is the master version. 1084PHONY += _modinst_post 1085_modinst_post: _modinst_ 1086 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1087 $(call cmd,depmod) 1088 1089ifeq ($(CONFIG_MODULE_SIG), y) 1090PHONY += modules_sign 1091modules_sign: 1092 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1093endif 1094 1095else # CONFIG_MODULES 1096 1097# Modules not configured 1098# --------------------------------------------------------------------------- 1099 1100modules modules_install: FORCE 1101 @echo >&2 1102 @echo >&2 "The present kernel configuration has modules disabled." 1103 @echo >&2 "Type 'make config' and enable loadable module support." 1104 @echo >&2 "Then build a kernel with module support enabled." 1105 @echo >&2 1106 @exit 1 1107 1108endif # CONFIG_MODULES 1109 1110### 1111# Cleaning is done on three levels. 1112# make clean Delete most generated files 1113# Leave enough to build external modules 1114# make mrproper Delete the current configuration, and all generated files 1115# make distclean Remove editor backup files, patch leftover files and the like 1116 1117# Directories & files removed with 'make clean' 1118CLEAN_DIRS += $(MODVERDIR) 1119 1120# Directories & files removed with 'make mrproper' 1121MRPROPER_DIRS += include/config usr/include include/generated \ 1122 arch/*/include/generated .tmp_objdiff 1123MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1124 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1125 signing_key.priv signing_key.x509 x509.genkey \ 1126 extra_certificates signing_key.x509.keyid \ 1127 signing_key.x509.signer include/linux/version.h 1128 1129# clean - Delete most, but leave enough to build external modules 1130# 1131clean: rm-dirs := $(CLEAN_DIRS) 1132clean: rm-files := $(CLEAN_FILES) 1133clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1134 1135PHONY += $(clean-dirs) clean archclean vmlinuxclean 1136$(clean-dirs): 1137 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1138 1139vmlinuxclean: 1140 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1141 1142clean: archclean vmlinuxclean 1143 1144# mrproper - Delete all generated files, including .config 1145# 1146mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1147mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1148mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1149 1150PHONY += $(mrproper-dirs) mrproper archmrproper 1151$(mrproper-dirs): 1152 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1153 1154mrproper: clean archmrproper $(mrproper-dirs) 1155 $(call cmd,rmdirs) 1156 $(call cmd,rmfiles) 1157 1158# distclean 1159# 1160PHONY += distclean 1161 1162distclean: mrproper 1163 @find $(srctree) $(RCS_FIND_IGNORE) \ 1164 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1165 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1166 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1167 -type f -print | xargs rm -f 1168 1169 1170# Packaging of the kernel to various formats 1171# --------------------------------------------------------------------------- 1172# rpm target kept for backward compatibility 1173package-dir := $(srctree)/scripts/package 1174 1175%src-pkg: FORCE 1176 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1177%pkg: include/config/kernel.release FORCE 1178 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1179rpm: include/config/kernel.release FORCE 1180 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1181 1182 1183# Brief documentation of the typical targets used 1184# --------------------------------------------------------------------------- 1185 1186boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1187boards := $(notdir $(boards)) 1188board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1189board-dirs := $(sort $(notdir $(board-dirs:/=))) 1190 1191help: 1192 @echo 'Cleaning targets:' 1193 @echo ' clean - Remove most generated files but keep the config and' 1194 @echo ' enough build support to build external modules' 1195 @echo ' mrproper - Remove all generated files + config + various backup files' 1196 @echo ' distclean - mrproper + remove editor backup and patch files' 1197 @echo '' 1198 @echo 'Configuration targets:' 1199 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1200 @echo '' 1201 @echo 'Other generic targets:' 1202 @echo ' all - Build all targets marked with [*]' 1203 @echo '* vmlinux - Build the bare kernel' 1204 @echo '* modules - Build all modules' 1205 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1206 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1207 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1208 @echo ' dir/ - Build all files in dir and below' 1209 @echo ' dir/file.[oisS] - Build specified target only' 1210 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1211 @echo ' (requires a recent binutils and recent build (System.map))' 1212 @echo ' dir/file.ko - Build module including final link' 1213 @echo ' modules_prepare - Set up for building external modules' 1214 @echo ' tags/TAGS - Generate tags file for editors' 1215 @echo ' cscope - Generate cscope index' 1216 @echo ' gtags - Generate GNU GLOBAL index' 1217 @echo ' kernelrelease - Output the release version string' 1218 @echo ' kernelversion - Output the version stored in Makefile' 1219 @echo ' image_name - Output the image name' 1220 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1221 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1222 echo '' 1223 @echo 'Static analysers' 1224 @echo ' checkstack - Generate a list of stack hogs' 1225 @echo ' namespacecheck - Name space analysis on compiled kernel' 1226 @echo ' versioncheck - Sanity check on version.h usage' 1227 @echo ' includecheck - Check for duplicate included header files' 1228 @echo ' export_report - List the usages of all exported symbols' 1229 @echo ' headers_check - Sanity check on exported headers' 1230 @echo ' headerdep - Detect inclusion cycles in headers' 1231 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1232 @echo '' 1233 @echo 'Kernel packaging:' 1234 @$(MAKE) $(build)=$(package-dir) help 1235 @echo '' 1236 @echo 'Documentation targets:' 1237 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1238 @echo '' 1239 @echo 'Architecture specific targets ($(SRCARCH)):' 1240 @$(if $(archhelp),$(archhelp),\ 1241 echo ' No architecture specific help defined for $(SRCARCH)') 1242 @echo '' 1243 @$(if $(boards), \ 1244 $(foreach b, $(boards), \ 1245 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1246 echo '') 1247 @$(if $(board-dirs), \ 1248 $(foreach b, $(board-dirs), \ 1249 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1250 printf " %-16s - Show all of the above\\n" help-boards; \ 1251 echo '') 1252 1253 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1254 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1255 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1256 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1257 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1258 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1259 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1260 @echo ' 1: warnings which may be relevant and do not occur too often' 1261 @echo ' 2: warnings which occur quite often but may still be relevant' 1262 @echo ' 3: more obscure warnings, can most likely be ignored' 1263 @echo ' Multiple levels can be combined with W=12 or W=123' 1264 @echo '' 1265 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1266 @echo 'For further info see the ./README file' 1267 1268 1269help-board-dirs := $(addprefix help-,$(board-dirs)) 1270 1271help-boards: $(help-board-dirs) 1272 1273boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1274 1275$(help-board-dirs): help-%: 1276 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1277 @$(if $(boards-per-dir), \ 1278 $(foreach b, $(boards-per-dir), \ 1279 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1280 echo '') 1281 1282 1283# Documentation targets 1284# --------------------------------------------------------------------------- 1285%docs: scripts_basic FORCE 1286 $(Q)$(MAKE) $(build)=scripts build_docproc 1287 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1288 1289else # KBUILD_EXTMOD 1290 1291### 1292# External module support. 1293# When building external modules the kernel used as basis is considered 1294# read-only, and no consistency checks are made and the make 1295# system is not used on the basis kernel. If updates are required 1296# in the basis kernel ordinary make commands (without M=...) must 1297# be used. 1298# 1299# The following are the only valid targets when building external 1300# modules. 1301# make M=dir clean Delete all automatically generated files 1302# make M=dir modules Make all modules in specified dir 1303# make M=dir Same as 'make M=dir modules' 1304# make M=dir modules_install 1305# Install the modules built in the module directory 1306# Assumes install directory is already created 1307 1308# We are always building modules 1309KBUILD_MODULES := 1 1310PHONY += crmodverdir 1311crmodverdir: 1312 $(cmd_crmodverdir) 1313 1314PHONY += $(objtree)/Module.symvers 1315$(objtree)/Module.symvers: 1316 @test -e $(objtree)/Module.symvers || ( \ 1317 echo; \ 1318 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1319 echo " is missing; modules will have no dependencies and modversions."; \ 1320 echo ) 1321 1322module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1323PHONY += $(module-dirs) modules 1324$(module-dirs): crmodverdir $(objtree)/Module.symvers 1325 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1326 1327modules: $(module-dirs) 1328 @$(kecho) ' Building modules, stage 2.'; 1329 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1330 1331PHONY += modules_install 1332modules_install: _emodinst_ _emodinst_post 1333 1334install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1335PHONY += _emodinst_ 1336_emodinst_: 1337 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1338 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1339 1340PHONY += _emodinst_post 1341_emodinst_post: _emodinst_ 1342 $(call cmd,depmod) 1343 1344clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1345 1346PHONY += $(clean-dirs) clean 1347$(clean-dirs): 1348 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1349 1350clean: rm-dirs := $(MODVERDIR) 1351clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1352 1353help: 1354 @echo ' Building external modules.' 1355 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1356 @echo '' 1357 @echo ' modules - default target, build the module(s)' 1358 @echo ' modules_install - install the module' 1359 @echo ' clean - remove generated files in module directory only' 1360 @echo '' 1361 1362# Dummies... 1363PHONY += prepare scripts 1364prepare: ; 1365scripts: ; 1366endif # KBUILD_EXTMOD 1367 1368clean: $(clean-dirs) 1369 $(call cmd,rmdirs) 1370 $(call cmd,rmfiles) 1371 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1372 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1373 -o -name '*.ko.*' \ 1374 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1375 -o -name '*.symtypes' -o -name 'modules.order' \ 1376 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1377 -o -name '*.gcno' \) -type f -print | xargs rm -f 1378 1379# Generate tags for editors 1380# --------------------------------------------------------------------------- 1381quiet_cmd_tags = GEN $@ 1382 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1383 1384tags TAGS cscope gtags: FORCE 1385 $(call cmd,tags) 1386 1387# Scripts to check various things for consistency 1388# --------------------------------------------------------------------------- 1389 1390PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1391 1392includecheck: 1393 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1394 -name '*.[hcS]' -type f -print | sort \ 1395 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1396 1397versioncheck: 1398 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1399 -name '*.[hcS]' -type f -print | sort \ 1400 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1401 1402coccicheck: 1403 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1404 1405namespacecheck: 1406 $(PERL) $(srctree)/scripts/namespace.pl 1407 1408export_report: 1409 $(PERL) $(srctree)/scripts/export_report.pl 1410 1411endif #ifeq ($(config-targets),1) 1412endif #ifeq ($(mixed-targets),1) 1413 1414PHONY += checkstack kernelrelease kernelversion image_name 1415 1416# UML needs a little special treatment here. It wants to use the host 1417# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1418# else wants $(ARCH), including people doing cross-builds, which means 1419# that $(SUBARCH) doesn't work here. 1420ifeq ($(ARCH), um) 1421CHECKSTACK_ARCH := $(SUBARCH) 1422else 1423CHECKSTACK_ARCH := $(ARCH) 1424endif 1425checkstack: 1426 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1427 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1428 1429kernelrelease: 1430 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1431 1432kernelversion: 1433 @echo $(KERNELVERSION) 1434 1435image_name: 1436 @echo $(KBUILD_IMAGE) 1437 1438# Clear a bunch of variables before executing the submake 1439tools/: FORCE 1440 $(Q)mkdir -p $(objtree)/tools 1441 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1442 1443tools/%: FORCE 1444 $(Q)mkdir -p $(objtree)/tools 1445 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1446 1447# Single targets 1448# --------------------------------------------------------------------------- 1449# Single targets are compatible with: 1450# - build with mixed source and output 1451# - build with separate output dir 'make O=...' 1452# - external modules 1453# 1454# target-dir => where to store outputfile 1455# build-dir => directory in kernel source tree to use 1456 1457ifeq ($(KBUILD_EXTMOD),) 1458 build-dir = $(patsubst %/,%,$(dir $@)) 1459 target-dir = $(dir $@) 1460else 1461 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1462 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1463 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1464endif 1465 1466%.s: %.c prepare scripts FORCE 1467 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1468%.i: %.c prepare scripts FORCE 1469 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1470%.o: %.c prepare scripts FORCE 1471 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1472%.lst: %.c prepare scripts FORCE 1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1474%.s: %.S prepare scripts FORCE 1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1476%.o: %.S prepare scripts FORCE 1477 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1478%.symtypes: %.c prepare scripts FORCE 1479 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1480 1481# Modules 1482/: prepare scripts FORCE 1483 $(cmd_crmodverdir) 1484 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1485 $(build)=$(build-dir) 1486%/: prepare scripts FORCE 1487 $(cmd_crmodverdir) 1488 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1489 $(build)=$(build-dir) 1490%.ko: prepare scripts FORCE 1491 $(cmd_crmodverdir) 1492 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1493 $(build)=$(build-dir) $(@:.ko=.o) 1494 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1495 1496# FIXME Should go into a make.lib or something 1497# =========================================================================== 1498 1499quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1500 cmd_rmdirs = rm -rf $(rm-dirs) 1501 1502quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1503 cmd_rmfiles = rm -f $(rm-files) 1504 1505# Run depmod only if we have System.map and depmod is executable 1506quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1507 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1508 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1509 1510# Create temporary dir for module support files 1511# clean it up only when building all modules 1512cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1513 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1514 1515# read all saved command lines 1516 1517targets := $(wildcard $(sort $(targets))) 1518cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1519 1520ifneq ($(cmd_files),) 1521 $(cmd_files): ; # Do not try to update included dependency files 1522 include $(cmd_files) 1523endif 1524 1525# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1526# Usage: 1527# $(Q)$(MAKE) $(clean)=dir 1528clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj 1529 1530endif # skip-makefile 1531 1532PHONY += FORCE 1533FORCE: 1534 1535# Declare the contents of the .PHONY variable as phony. We keep that 1536# information in a variable so we can use it in if_changed and friends. 1537.PHONY: $(PHONY) 1538