1VERSION = 4 2PATCHLEVEL = 1 3SUBLEVEL = 0 4EXTRAVERSION = -rc2 5NAME = Hurr durr I'ma sheep 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# o Do not use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15# o Look for make include files relative to root of kernel src 16MAKEFLAGS += -rR --include-dir=$(CURDIR) 17 18# Avoid funny character set dependencies 19unexport LC_ALL 20LC_COLLATE=C 21LC_NUMERIC=C 22export LC_COLLATE LC_NUMERIC 23 24# Avoid interference with shell env settings 25unexport GREP_OPTIONS 26 27# We are using a recursive build, so we need to do a little thinking 28# to get the ordering right. 29# 30# Most importantly: sub-Makefiles should only ever modify files in 31# their own directory. If in some directory we have a dependency on 32# a file in another dir (which doesn't happen often, but it's often 33# unavoidable when linking the built-in.o targets which finally 34# turn into vmlinux), we will call a sub make in that other dir, and 35# after that we are sure that everything which is in that other dir 36# is now up to date. 37# 38# The only cases where we need to modify files which have global 39# effects are thus separated out and done before the recursive 40# descending is started. They are now explicitly listed as the 41# prepare rule. 42 43# Beautify output 44# --------------------------------------------------------------------------- 45# 46# Normally, we echo the whole command before executing it. By making 47# that echo $($(quiet)$(cmd)), we now have the possibility to set 48# $(quiet) to choose other forms of output instead, e.g. 49# 50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 52# 53# If $(quiet) is empty, the whole command will be printed. 54# If it is set to "quiet_", only the short version will be printed. 55# If it is set to "silent_", nothing will be printed at all, since 56# the variable $(silent_cmd_cc_o_c) doesn't exist. 57# 58# A simple variant is to prefix commands with $(Q) - that's useful 59# for commands that shall be hidden in non-verbose mode. 60# 61# $(Q)ln $@ :< 62# 63# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 64# If KBUILD_VERBOSE equals 1 then the above command is displayed. 65# 66# To put more focus on warnings, be less verbose as default 67# Use 'make V=1' to see the full commands 68 69ifeq ("$(origin V)", "command line") 70 KBUILD_VERBOSE = $(V) 71endif 72ifndef KBUILD_VERBOSE 73 KBUILD_VERBOSE = 0 74endif 75 76ifeq ($(KBUILD_VERBOSE),1) 77 quiet = 78 Q = 79else 80 quiet=quiet_ 81 Q = @ 82endif 83 84# If the user is running make -s (silent mode), suppress echoing of 85# commands 86 87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 89 quiet=silent_ 90endif 91else # make-3.8x 92ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 93 quiet=silent_ 94endif 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is set on invocation of make in OBJ directory 115# KBUILD_SRC is not intended to be used by the regular user (for now) 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# That's our default target when none is given on the command line 125PHONY := _all 126_all: 127 128# Cancel implicit rules on top Makefile 129$(CURDIR)/Makefile Makefile: ; 130 131ifneq ($(KBUILD_OUTPUT),) 132# Invoke a second make in the output directory, passing relevant variables 133# check that the output directory actually exists 134saved-output := $(KBUILD_OUTPUT) 135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 136 && /bin/pwd) 137$(if $(KBUILD_OUTPUT),, \ 138 $(error failed to create output directory "$(saved-output)")) 139 140PHONY += $(MAKECMDGOALS) sub-make 141 142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 143 @: 144 145sub-make: FORCE 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/sparse.txt" for more details, including 170# where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190# If building an external module we do not care about the all: rule 191# but instead _all depend on modules 192PHONY += all 193ifeq ($(KBUILD_EXTMOD),) 194_all: all 195else 196_all: modules 197endif 198 199ifeq ($(KBUILD_SRC),) 200 # building in the source tree 201 srctree := . 202else 203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 204 # building in a subdirectory of the source tree 205 srctree := .. 206 else 207 srctree := $(KBUILD_SRC) 208 endif 209endif 210objtree := . 211src := $(srctree) 212obj := $(objtree) 213 214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 215 216export srctree objtree VPATH 217 218# SUBARCH tells the usermode build what the underlying arch is. That is set 219# first, and if a usermode build is happening, the "ARCH=um" on the command 220# line overrides the setting of ARCH below. If a native build is happening, 221# then ARCH is assigned, getting whatever value it gets normally, and 222# SUBARCH is subsequently ignored. 223 224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 225 -e s/sun4u/sparc64/ \ 226 -e s/arm.*/arm/ -e s/sa110/arm/ \ 227 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 230 231# Cross compiling and selecting different set of gcc/bin-utils 232# --------------------------------------------------------------------------- 233# 234# When performing cross compilation for other architectures ARCH shall be set 235# to the target architecture. (See arch/* for the possibilities). 236# ARCH can be set during invocation of make: 237# make ARCH=ia64 238# Another way is to have ARCH set in the environment. 239# The default ARCH is the host where make is executed. 240 241# CROSS_COMPILE specify the prefix used for all executables used 242# during compilation. Only gcc and related bin-utils executables 243# are prefixed with $(CROSS_COMPILE). 244# CROSS_COMPILE can be set on the command line 245# make CROSS_COMPILE=ia64-linux- 246# Alternatively CROSS_COMPILE can be set in the environment. 247# A third alternative is to store a setting in .config so that plain 248# "make" in the configured kernel build directory always uses that. 249# Default value for CROSS_COMPILE is not to prefix executables 250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 251ARCH ?= $(SUBARCH) 252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 253 254# Architecture as present in compile.h 255UTS_MACHINE := $(ARCH) 256SRCARCH := $(ARCH) 257 258# Additional ARCH settings for x86 259ifeq ($(ARCH),i386) 260 SRCARCH := x86 261endif 262ifeq ($(ARCH),x86_64) 263 SRCARCH := x86 264endif 265 266# Additional ARCH settings for sparc 267ifeq ($(ARCH),sparc32) 268 SRCARCH := sparc 269endif 270ifeq ($(ARCH),sparc64) 271 SRCARCH := sparc 272endif 273 274# Additional ARCH settings for sh 275ifeq ($(ARCH),sh64) 276 SRCARCH := sh 277endif 278 279# Additional ARCH settings for tile 280ifeq ($(ARCH),tilepro) 281 SRCARCH := tile 282endif 283ifeq ($(ARCH),tilegx) 284 SRCARCH := tile 285endif 286 287# Where to locate arch specific headers 288hdr-arch := $(SRCARCH) 289 290KCONFIG_CONFIG ?= .config 291export KCONFIG_CONFIG 292 293# SHELL used by kbuild 294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 295 else if [ -x /bin/bash ]; then echo /bin/bash; \ 296 else echo sh; fi ; fi) 297 298HOSTCC = gcc 299HOSTCXX = g++ 300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 301HOSTCXXFLAGS = -O2 302 303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 306endif 307 308# Decide whether to build built-in, modular, or both. 309# Normally, just do built-in. 310 311KBUILD_MODULES := 312KBUILD_BUILTIN := 1 313 314# If we have only "make modules", don't compile built-in objects. 315# When we're building modules with modversions, we need to consider 316# the built-in objects during the descend as well, in order to 317# make sure the checksums are up to date before we record them. 318 319ifeq ($(MAKECMDGOALS),modules) 320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 321endif 322 323# If we have "make <whatever> modules", compile modules 324# in addition to whatever we do anyway. 325# Just "make" or "make all" shall build modules as well 326 327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 328 KBUILD_MODULES := 1 329endif 330 331ifeq ($(MAKECMDGOALS),) 332 KBUILD_MODULES := 1 333endif 334 335export KBUILD_MODULES KBUILD_BUILTIN 336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 337 338ifneq ($(CC),) 339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 340COMPILER := clang 341else 342COMPILER := gcc 343endif 344export COMPILER 345endif 346 347# We need some generic definitions (do not try to remake the file). 348scripts/Kbuild.include: ; 349include scripts/Kbuild.include 350 351# Make variables (CC, etc...) 352AS = $(CROSS_COMPILE)as 353LD = $(CROSS_COMPILE)ld 354CC = $(CROSS_COMPILE)gcc 355CPP = $(CC) -E 356AR = $(CROSS_COMPILE)ar 357NM = $(CROSS_COMPILE)nm 358STRIP = $(CROSS_COMPILE)strip 359OBJCOPY = $(CROSS_COMPILE)objcopy 360OBJDUMP = $(CROSS_COMPILE)objdump 361AWK = awk 362GENKSYMS = scripts/genksyms/genksyms 363INSTALLKERNEL := installkernel 364DEPMOD = /sbin/depmod 365PERL = perl 366PYTHON = python 367CHECK = sparse 368 369CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 370 -Wbitwise -Wno-return-void $(CF) 371CFLAGS_MODULE = 372AFLAGS_MODULE = 373LDFLAGS_MODULE = 374CFLAGS_KERNEL = 375AFLAGS_KERNEL = 376CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 377 378 379# Use USERINCLUDE when you must reference the UAPI directories only. 380USERINCLUDE := \ 381 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 382 -Iarch/$(hdr-arch)/include/generated/uapi \ 383 -I$(srctree)/include/uapi \ 384 -Iinclude/generated/uapi \ 385 -include $(srctree)/include/linux/kconfig.h 386 387# Use LINUXINCLUDE when you must reference the include/ directory. 388# Needed to be compatible with the O= option 389LINUXINCLUDE := \ 390 -I$(srctree)/arch/$(hdr-arch)/include \ 391 -Iarch/$(hdr-arch)/include/generated/uapi \ 392 -Iarch/$(hdr-arch)/include/generated \ 393 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 394 -Iinclude \ 395 $(USERINCLUDE) 396 397KBUILD_CPPFLAGS := -D__KERNEL__ 398 399KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 400 -fno-strict-aliasing -fno-common \ 401 -Werror-implicit-function-declaration \ 402 -Wno-format-security \ 403 -std=gnu89 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 PYTHON 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 CFLAGS_KASAN 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 482old_version_h := include/linux/version.h 483 484no-dot-config-targets := clean mrproper distclean \ 485 cscope gtags TAGS tags help% %docs check% coccicheck \ 486 $(version_h) headers_% archheaders archscripts \ 487 kernelversion %src-pkg 488 489config-targets := 0 490mixed-targets := 0 491dot-config := 1 492 493ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 494 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 495 dot-config := 0 496 endif 497endif 498 499ifeq ($(KBUILD_EXTMOD),) 500 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 501 config-targets := 1 502 ifneq ($(words $(MAKECMDGOALS)),1) 503 mixed-targets := 1 504 endif 505 endif 506endif 507 508ifeq ($(mixed-targets),1) 509# =========================================================================== 510# We're called with mixed targets (*config and build targets). 511# Handle them one by one. 512 513PHONY += $(MAKECMDGOALS) __build_one_by_one 514 515$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 516 @: 517 518__build_one_by_one: 519 $(Q)set -e; \ 520 for i in $(MAKECMDGOALS); do \ 521 $(MAKE) -f $(srctree)/Makefile $$i; \ 522 done 523 524else 525ifeq ($(config-targets),1) 526# =========================================================================== 527# *config targets only - make sure prerequisites are updated, and descend 528# in scripts/kconfig to make the *config target 529 530# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 531# KBUILD_DEFCONFIG may point out an alternative default configuration 532# used for 'make defconfig' 533include arch/$(SRCARCH)/Makefile 534export KBUILD_DEFCONFIG KBUILD_KCONFIG 535 536config: scripts_basic outputmakefile FORCE 537 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 538 539%config: scripts_basic outputmakefile FORCE 540 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 541 542else 543# =========================================================================== 544# Build targets only - this includes vmlinux, arch specific targets, clean 545# targets and others. In general all targets except *config targets. 546 547ifeq ($(KBUILD_EXTMOD),) 548# Additional helpers built in scripts/ 549# Carefully list dependencies so we do not try to build scripts twice 550# in parallel 551PHONY += scripts 552scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 553 asm-generic 554 $(Q)$(MAKE) $(build)=$(@) 555 556# Objects we will link into vmlinux / subdirs we need to visit 557init-y := init/ 558drivers-y := drivers/ sound/ firmware/ 559net-y := net/ 560libs-y := lib/ 561core-y := usr/ 562endif # KBUILD_EXTMOD 563 564ifeq ($(dot-config),1) 565# Read in config 566-include include/config/auto.conf 567 568ifeq ($(KBUILD_EXTMOD),) 569# Read in dependencies to all Kconfig* files, make sure to run 570# oldconfig if changes are detected. 571-include include/config/auto.conf.cmd 572 573# To avoid any implicit rule to kick in, define an empty command 574$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 575 576# If .config is newer than include/config/auto.conf, someone tinkered 577# with it and forgot to run make oldconfig. 578# if auto.conf.cmd is missing then we are probably in a cleaned tree so 579# we execute the config step to be sure to catch updated Kconfig files 580include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 581 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 582else 583# external modules needs include/generated/autoconf.h and include/config/auto.conf 584# but do not care if they are up-to-date. Use auto.conf to trigger the test 585PHONY += include/config/auto.conf 586 587include/config/auto.conf: 588 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 589 echo >&2; \ 590 echo >&2 " ERROR: Kernel configuration is invalid."; \ 591 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 592 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 593 echo >&2 ; \ 594 /bin/false) 595 596endif # KBUILD_EXTMOD 597 598else 599# Dummy target needed, because used as prerequisite 600include/config/auto.conf: ; 601endif # $(dot-config) 602 603# The all: target is the default when no target is given on the 604# command line. 605# This allow a user to issue only 'make' to build a kernel including modules 606# Defaults to vmlinux, but the arch makefile usually adds further targets 607all: vmlinux 608 609include arch/$(SRCARCH)/Makefile 610 611KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 612 613ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 614KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 615else 616KBUILD_CFLAGS += -O2 617endif 618 619# Tell gcc to never replace conditional load with a non-conditional one 620KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 621 622ifdef CONFIG_READABLE_ASM 623# Disable optimizations that make assembler listings hard to read. 624# reorder blocks reorders the control in the function 625# ipa clone creates specialized cloned functions 626# partial inlining inlines only parts of functions 627KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 628 $(call cc-option,-fno-ipa-cp-clone,) \ 629 $(call cc-option,-fno-partial-inlining) 630endif 631 632ifneq ($(CONFIG_FRAME_WARN),0) 633KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 634endif 635 636# Handle stack protector mode. 637# 638# Since kbuild can potentially perform two passes (first with the old 639# .config values and then with updated .config values), we cannot error out 640# if a desired compiler option is unsupported. If we were to error, kbuild 641# could never get to the second pass and actually notice that we changed 642# the option to something that was supported. 643# 644# Additionally, we don't want to fallback and/or silently change which compiler 645# flags will be used, since that leads to producing kernels with different 646# security feature characteristics depending on the compiler used. ("But I 647# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 648# 649# The middle ground is to warn here so that the failed option is obvious, but 650# to let the build fail with bad compiler flags so that we can't produce a 651# kernel when there is a CONFIG and compiler mismatch. 652# 653ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 654 stackp-flag := -fstack-protector 655 ifeq ($(call cc-option, $(stackp-flag)),) 656 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 657 -fstack-protector not supported by compiler) 658 endif 659else 660ifdef CONFIG_CC_STACKPROTECTOR_STRONG 661 stackp-flag := -fstack-protector-strong 662 ifeq ($(call cc-option, $(stackp-flag)),) 663 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 664 -fstack-protector-strong not supported by compiler) 665 endif 666else 667 # Force off for distro compilers that enable stack protector by default. 668 stackp-flag := $(call cc-option, -fno-stack-protector) 669endif 670endif 671KBUILD_CFLAGS += $(stackp-flag) 672 673ifeq ($(COMPILER),clang) 674KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 675KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 676KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 677KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 678KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 679# Quiet clang warning: comparison of unsigned expression < 0 is always false 680KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 681# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 682# source of a reference will be _MergedGlobals and not on of the whitelisted names. 683# See modpost pattern 2 684KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 685KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 686else 687 688# This warning generated too much noise in a regular build. 689# Use make W=1 to enable this warning (see scripts/Makefile.build) 690KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 691endif 692 693ifdef CONFIG_FRAME_POINTER 694KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 695else 696# Some targets (ARM with Thumb2, for example), can't be built with frame 697# pointers. For those, we don't have FUNCTION_TRACER automatically 698# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 699# incompatible with -fomit-frame-pointer with current GCC, so we don't use 700# -fomit-frame-pointer with FUNCTION_TRACER. 701ifndef CONFIG_FUNCTION_TRACER 702KBUILD_CFLAGS += -fomit-frame-pointer 703endif 704endif 705 706KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 707 708ifdef CONFIG_DEBUG_INFO 709ifdef CONFIG_DEBUG_INFO_SPLIT 710KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 711else 712KBUILD_CFLAGS += -g 713endif 714KBUILD_AFLAGS += -Wa,-gdwarf-2 715endif 716ifdef CONFIG_DEBUG_INFO_DWARF4 717KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 718endif 719 720ifdef CONFIG_DEBUG_INFO_REDUCED 721KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 722 $(call cc-option,-fno-var-tracking) 723endif 724 725ifdef CONFIG_FUNCTION_TRACER 726ifndef CC_FLAGS_FTRACE 727CC_FLAGS_FTRACE := -pg 728endif 729export CC_FLAGS_FTRACE 730ifdef CONFIG_HAVE_FENTRY 731CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 732endif 733KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 734KBUILD_AFLAGS += $(CC_USING_FENTRY) 735ifdef CONFIG_DYNAMIC_FTRACE 736 ifdef CONFIG_HAVE_C_RECORDMCOUNT 737 BUILD_C_RECORDMCOUNT := y 738 export BUILD_C_RECORDMCOUNT 739 endif 740endif 741endif 742 743# We trigger additional mismatches with less inlining 744ifdef CONFIG_DEBUG_SECTION_MISMATCH 745KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 746endif 747 748# arch Makefile may override CC so keep this after arch Makefile is included 749NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 750CHECKFLAGS += $(NOSTDINC_FLAGS) 751 752# warn about C99 declaration after statement 753KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 754 755# disable pointer signed / unsigned warnings in gcc 4.0 756KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 757 758# disable invalid "can't wrap" optimizations for signed / pointers 759KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 760 761# conserve stack if available 762KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 763 764# disallow errors like 'EXPORT_GPL(foo);' with missing header 765KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 766 767# require functions to have arguments in prototypes, not empty 'int foo()' 768KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 769 770# Prohibit date/time macros, which would make the build non-deterministic 771KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 772 773# use the deterministic mode of AR if available 774KBUILD_ARFLAGS := $(call ar-option,D) 775 776# check for 'asm goto' 777ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 778 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 779 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 780endif 781 782include scripts/Makefile.kasan 783include 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# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 846# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 847# or CONFIG_MODULE_COMPRESS_XZ. 848 849mod_compress_cmd = true 850ifdef CONFIG_MODULE_COMPRESS 851 ifdef CONFIG_MODULE_COMPRESS_GZIP 852 mod_compress_cmd = gzip -n 853 endif # CONFIG_MODULE_COMPRESS_GZIP 854 ifdef CONFIG_MODULE_COMPRESS_XZ 855 mod_compress_cmd = xz 856 endif # CONFIG_MODULE_COMPRESS_XZ 857endif # CONFIG_MODULE_COMPRESS 858export mod_compress_cmd 859 860# Select initial ramdisk compression format, default is gzip(1). 861# This shall be used by the dracut(8) tool while creating an initramfs image. 862# 863INITRD_COMPRESS-y := gzip 864INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 865INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 866INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 867INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 868INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 869# do not export INITRD_COMPRESS, since we didn't actually 870# choose a sane default compression above. 871# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 872 873ifdef CONFIG_MODULE_SIG_ALL 874MODSECKEY = ./signing_key.priv 875MODPUBKEY = ./signing_key.x509 876export MODPUBKEY 877mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 878else 879mod_sign_cmd = true 880endif 881export mod_sign_cmd 882 883 884ifeq ($(KBUILD_EXTMOD),) 885core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 886 887vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 888 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 889 $(net-y) $(net-m) $(libs-y) $(libs-m))) 890 891vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 892 $(init-) $(core-) $(drivers-) $(net-) $(libs-)))) 893 894init-y := $(patsubst %/, %/built-in.o, $(init-y)) 895core-y := $(patsubst %/, %/built-in.o, $(core-y)) 896drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 897net-y := $(patsubst %/, %/built-in.o, $(net-y)) 898libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 899libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 900libs-y := $(libs-y1) $(libs-y2) 901 902# Externally visible symbols (used by link-vmlinux.sh) 903export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 904export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 905export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 906export LDFLAGS_vmlinux 907# used by scripts/pacmage/Makefile 908export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 909 910vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 911 912# Final link of vmlinux 913 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 914quiet_cmd_link-vmlinux = LINK $@ 915 916# Include targets which we want to 917# execute if the rest of the kernel build went well. 918vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 919ifdef CONFIG_HEADERS_CHECK 920 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 921endif 922ifdef CONFIG_SAMPLES 923 $(Q)$(MAKE) $(build)=samples 924endif 925ifdef CONFIG_BUILD_DOCSRC 926 $(Q)$(MAKE) $(build)=Documentation 927endif 928ifdef CONFIG_GDB_SCRIPTS 929 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 930endif 931 +$(call if_changed,link-vmlinux) 932 933# The actual objects are generated when descending, 934# make sure no implicit rule kicks in 935$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 936 937# Handle descending into subdirectories listed in $(vmlinux-dirs) 938# Preset locale variables to speed up the build process. Limit locale 939# tweaks to this spot to avoid wrong language settings when running 940# make menuconfig etc. 941# Error messages still appears in the original language 942 943PHONY += $(vmlinux-dirs) 944$(vmlinux-dirs): prepare scripts 945 $(Q)$(MAKE) $(build)=$@ 946 947define filechk_kernel.release 948 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 949endef 950 951# Store (new) KERNELRELEASE string in include/config/kernel.release 952include/config/kernel.release: include/config/auto.conf FORCE 953 $(call filechk,kernel.release) 954 955 956# Things we need to do before we recursively start building the kernel 957# or the modules are listed in "prepare". 958# A multi level approach is used. prepareN is processed before prepareN-1. 959# archprepare is used in arch Makefiles and when processed asm symlink, 960# version.h and scripts_basic is processed / created. 961 962# Listed in dependency order 963PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 964 965# prepare3 is used to check if we are building in a separate output directory, 966# and if so do: 967# 1) Check that make has not been executed in the kernel src $(srctree) 968prepare3: include/config/kernel.release 969ifneq ($(KBUILD_SRC),) 970 @$(kecho) ' Using $(srctree) as source for kernel' 971 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 972 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 973 echo >&2 " in the '$(srctree)' directory.";\ 974 /bin/false; \ 975 fi; 976endif 977 978# prepare2 creates a makefile if using a separate output directory 979prepare2: prepare3 outputmakefile asm-generic 980 981prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 982 include/config/auto.conf 983 $(cmd_crmodverdir) 984 985archprepare: archheaders archscripts prepare1 scripts_basic 986 987prepare0: archprepare FORCE 988 $(Q)$(MAKE) $(build)=. 989 990# All the preparing.. 991prepare: prepare0 992 993# Generate some files 994# --------------------------------------------------------------------------- 995 996# KERNELRELEASE can change from a few different places, meaning version.h 997# needs to be updated, so this check is forced on all builds 998 999uts_len := 64 1000define filechk_utsrelease.h 1001 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1002 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1003 exit 1; \ 1004 fi; \ 1005 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1006endef 1007 1008define filechk_version.h 1009 (echo \#define LINUX_VERSION_CODE $(shell \ 1010 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1011 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1012endef 1013 1014$(version_h): $(srctree)/Makefile FORCE 1015 $(call filechk,version.h) 1016 $(Q)rm -f $(old_version_h) 1017 1018include/generated/utsrelease.h: include/config/kernel.release FORCE 1019 $(call filechk,utsrelease.h) 1020 1021PHONY += headerdep 1022headerdep: 1023 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1024 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1025 1026# --------------------------------------------------------------------------- 1027# Firmware install 1028INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1029export INSTALL_FW_PATH 1030 1031PHONY += firmware_install 1032firmware_install: FORCE 1033 @mkdir -p $(objtree)/firmware 1034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1035 1036# --------------------------------------------------------------------------- 1037# Kernel headers 1038 1039#Default location for installed headers 1040export INSTALL_HDR_PATH = $(objtree)/usr 1041 1042# If we do an all arch process set dst to asm-$(hdr-arch) 1043hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1044 1045PHONY += archheaders 1046archheaders: 1047 1048PHONY += archscripts 1049archscripts: 1050 1051PHONY += __headers 1052__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1053 $(Q)$(MAKE) $(build)=scripts build_unifdef 1054 1055PHONY += headers_install_all 1056headers_install_all: 1057 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1058 1059PHONY += headers_install 1060headers_install: __headers 1061 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1062 $(error Headers not exportable for the $(SRCARCH) architecture)) 1063 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1064 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1065 1066PHONY += headers_check_all 1067headers_check_all: headers_install_all 1068 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1069 1070PHONY += headers_check 1071headers_check: headers_install 1072 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1073 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1074 1075# --------------------------------------------------------------------------- 1076# Kernel selftest 1077 1078PHONY += kselftest 1079kselftest: 1080 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1081 1082# --------------------------------------------------------------------------- 1083# Modules 1084 1085ifdef CONFIG_MODULES 1086 1087# By default, build modules as well 1088 1089all: modules 1090 1091# Build modules 1092# 1093# A module can be listed more than once in obj-m resulting in 1094# duplicate lines in modules.order files. Those are removed 1095# using awk while concatenating to the final file. 1096 1097PHONY += modules 1098modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1099 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1100 @$(kecho) ' Building modules, stage 2.'; 1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1102 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1103 1104modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1105 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1106 1107%/modules.builtin: include/config/auto.conf 1108 $(Q)$(MAKE) $(modbuiltin)=$* 1109 1110 1111# Target to prepare building external modules 1112PHONY += modules_prepare 1113modules_prepare: prepare scripts 1114 1115# Target to install modules 1116PHONY += modules_install 1117modules_install: _modinst_ _modinst_post 1118 1119PHONY += _modinst_ 1120_modinst_: 1121 @rm -rf $(MODLIB)/kernel 1122 @rm -f $(MODLIB)/source 1123 @mkdir -p $(MODLIB)/kernel 1124 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1125 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1126 rm -f $(MODLIB)/build ; \ 1127 ln -s $(CURDIR) $(MODLIB)/build ; \ 1128 fi 1129 @cp -f $(objtree)/modules.order $(MODLIB)/ 1130 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1131 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1132 1133# This depmod is only for convenience to give the initial 1134# boot a modules.dep even before / is mounted read-write. However the 1135# boot script depmod is the master version. 1136PHONY += _modinst_post 1137_modinst_post: _modinst_ 1138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1139 $(call cmd,depmod) 1140 1141ifeq ($(CONFIG_MODULE_SIG), y) 1142PHONY += modules_sign 1143modules_sign: 1144 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1145endif 1146 1147else # CONFIG_MODULES 1148 1149# Modules not configured 1150# --------------------------------------------------------------------------- 1151 1152modules modules_install: FORCE 1153 @echo >&2 1154 @echo >&2 "The present kernel configuration has modules disabled." 1155 @echo >&2 "Type 'make config' and enable loadable module support." 1156 @echo >&2 "Then build a kernel with module support enabled." 1157 @echo >&2 1158 @exit 1 1159 1160endif # CONFIG_MODULES 1161 1162### 1163# Cleaning is done on three levels. 1164# make clean Delete most generated files 1165# Leave enough to build external modules 1166# make mrproper Delete the current configuration, and all generated files 1167# make distclean Remove editor backup files, patch leftover files and the like 1168 1169# Directories & files removed with 'make clean' 1170CLEAN_DIRS += $(MODVERDIR) 1171 1172# Directories & files removed with 'make mrproper' 1173MRPROPER_DIRS += include/config usr/include include/generated \ 1174 arch/*/include/generated .tmp_objdiff 1175MRPROPER_FILES += .config .config.old .version .old_version \ 1176 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1177 signing_key.priv signing_key.x509 x509.genkey \ 1178 extra_certificates signing_key.x509.keyid \ 1179 signing_key.x509.signer vmlinux-gdb.py 1180 1181# clean - Delete most, but leave enough to build external modules 1182# 1183clean: rm-dirs := $(CLEAN_DIRS) 1184clean: rm-files := $(CLEAN_FILES) 1185clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1186 1187PHONY += $(clean-dirs) clean archclean vmlinuxclean 1188$(clean-dirs): 1189 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1190 1191vmlinuxclean: 1192 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1193 1194clean: archclean vmlinuxclean 1195 1196# mrproper - Delete all generated files, including .config 1197# 1198mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1199mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1200mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1201 1202PHONY += $(mrproper-dirs) mrproper archmrproper 1203$(mrproper-dirs): 1204 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1205 1206mrproper: clean archmrproper $(mrproper-dirs) 1207 $(call cmd,rmdirs) 1208 $(call cmd,rmfiles) 1209 1210# distclean 1211# 1212PHONY += distclean 1213 1214distclean: mrproper 1215 @find $(srctree) $(RCS_FIND_IGNORE) \ 1216 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1217 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1218 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1219 -type f -print | xargs rm -f 1220 1221 1222# Packaging of the kernel to various formats 1223# --------------------------------------------------------------------------- 1224# rpm target kept for backward compatibility 1225package-dir := scripts/package 1226 1227%src-pkg: FORCE 1228 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1229%pkg: include/config/kernel.release FORCE 1230 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1231rpm: include/config/kernel.release FORCE 1232 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1233 1234 1235# Brief documentation of the typical targets used 1236# --------------------------------------------------------------------------- 1237 1238boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1239boards := $(sort $(notdir $(boards))) 1240board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1241board-dirs := $(sort $(notdir $(board-dirs:/=))) 1242 1243help: 1244 @echo 'Cleaning targets:' 1245 @echo ' clean - Remove most generated files but keep the config and' 1246 @echo ' enough build support to build external modules' 1247 @echo ' mrproper - Remove all generated files + config + various backup files' 1248 @echo ' distclean - mrproper + remove editor backup and patch files' 1249 @echo '' 1250 @echo 'Configuration targets:' 1251 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1252 @echo '' 1253 @echo 'Other generic targets:' 1254 @echo ' all - Build all targets marked with [*]' 1255 @echo '* vmlinux - Build the bare kernel' 1256 @echo '* modules - Build all modules' 1257 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1258 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1259 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1260 @echo ' dir/ - Build all files in dir and below' 1261 @echo ' dir/file.[oisS] - Build specified target only' 1262 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1263 @echo ' (requires a recent binutils and recent build (System.map))' 1264 @echo ' dir/file.ko - Build module including final link' 1265 @echo ' modules_prepare - Set up for building external modules' 1266 @echo ' tags/TAGS - Generate tags file for editors' 1267 @echo ' cscope - Generate cscope index' 1268 @echo ' gtags - Generate GNU GLOBAL index' 1269 @echo ' kernelrelease - Output the release version string (use with make -s)' 1270 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1271 @echo ' image_name - Output the image name (use with make -s)' 1272 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1273 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1274 echo '' 1275 @echo 'Static analysers' 1276 @echo ' checkstack - Generate a list of stack hogs' 1277 @echo ' namespacecheck - Name space analysis on compiled kernel' 1278 @echo ' versioncheck - Sanity check on version.h usage' 1279 @echo ' includecheck - Check for duplicate included header files' 1280 @echo ' export_report - List the usages of all exported symbols' 1281 @echo ' headers_check - Sanity check on exported headers' 1282 @echo ' headerdep - Detect inclusion cycles in headers' 1283 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1284 @echo '' 1285 @echo 'Kernel selftest' 1286 @echo ' kselftest - Build and run kernel selftest (run as root)' 1287 @echo ' Build, install, and boot kernel before' 1288 @echo ' running kselftest on it' 1289 @echo '' 1290 @echo 'Kernel packaging:' 1291 @$(MAKE) $(build)=$(package-dir) help 1292 @echo '' 1293 @echo 'Documentation targets:' 1294 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1295 @echo '' 1296 @echo 'Architecture specific targets ($(SRCARCH)):' 1297 @$(if $(archhelp),$(archhelp),\ 1298 echo ' No architecture specific help defined for $(SRCARCH)') 1299 @echo '' 1300 @$(if $(boards), \ 1301 $(foreach b, $(boards), \ 1302 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1303 echo '') 1304 @$(if $(board-dirs), \ 1305 $(foreach b, $(board-dirs), \ 1306 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1307 printf " %-16s - Show all of the above\\n" help-boards; \ 1308 echo '') 1309 1310 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1311 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1312 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1313 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1314 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1315 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1316 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1317 @echo ' 1: warnings which may be relevant and do not occur too often' 1318 @echo ' 2: warnings which occur quite often but may still be relevant' 1319 @echo ' 3: more obscure warnings, can most likely be ignored' 1320 @echo ' Multiple levels can be combined with W=12 or W=123' 1321 @echo '' 1322 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1323 @echo 'For further info see the ./README file' 1324 1325 1326help-board-dirs := $(addprefix help-,$(board-dirs)) 1327 1328help-boards: $(help-board-dirs) 1329 1330boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1331 1332$(help-board-dirs): help-%: 1333 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1334 @$(if $(boards-per-dir), \ 1335 $(foreach b, $(boards-per-dir), \ 1336 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1337 echo '') 1338 1339 1340# Documentation targets 1341# --------------------------------------------------------------------------- 1342%docs: scripts_basic FORCE 1343 $(Q)$(MAKE) $(build)=scripts build_docproc 1344 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1345 1346else # KBUILD_EXTMOD 1347 1348### 1349# External module support. 1350# When building external modules the kernel used as basis is considered 1351# read-only, and no consistency checks are made and the make 1352# system is not used on the basis kernel. If updates are required 1353# in the basis kernel ordinary make commands (without M=...) must 1354# be used. 1355# 1356# The following are the only valid targets when building external 1357# modules. 1358# make M=dir clean Delete all automatically generated files 1359# make M=dir modules Make all modules in specified dir 1360# make M=dir Same as 'make M=dir modules' 1361# make M=dir modules_install 1362# Install the modules built in the module directory 1363# Assumes install directory is already created 1364 1365# We are always building modules 1366KBUILD_MODULES := 1 1367PHONY += crmodverdir 1368crmodverdir: 1369 $(cmd_crmodverdir) 1370 1371PHONY += $(objtree)/Module.symvers 1372$(objtree)/Module.symvers: 1373 @test -e $(objtree)/Module.symvers || ( \ 1374 echo; \ 1375 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1376 echo " is missing; modules will have no dependencies and modversions."; \ 1377 echo ) 1378 1379module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1380PHONY += $(module-dirs) modules 1381$(module-dirs): crmodverdir $(objtree)/Module.symvers 1382 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1383 1384modules: $(module-dirs) 1385 @$(kecho) ' Building modules, stage 2.'; 1386 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1387 1388PHONY += modules_install 1389modules_install: _emodinst_ _emodinst_post 1390 1391install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1392PHONY += _emodinst_ 1393_emodinst_: 1394 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1395 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1396 1397PHONY += _emodinst_post 1398_emodinst_post: _emodinst_ 1399 $(call cmd,depmod) 1400 1401clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1402 1403PHONY += $(clean-dirs) clean 1404$(clean-dirs): 1405 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1406 1407clean: rm-dirs := $(MODVERDIR) 1408clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1409 1410help: 1411 @echo ' Building external modules.' 1412 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1413 @echo '' 1414 @echo ' modules - default target, build the module(s)' 1415 @echo ' modules_install - install the module' 1416 @echo ' clean - remove generated files in module directory only' 1417 @echo '' 1418 1419# Dummies... 1420PHONY += prepare scripts 1421prepare: ; 1422scripts: ; 1423endif # KBUILD_EXTMOD 1424 1425clean: $(clean-dirs) 1426 $(call cmd,rmdirs) 1427 $(call cmd,rmfiles) 1428 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1429 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1430 -o -name '*.ko.*' \ 1431 -o -name '*.dwo' \ 1432 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1433 -o -name '*.symtypes' -o -name 'modules.order' \ 1434 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1435 -o -name '*.gcno' \) -type f -print | xargs rm -f 1436 1437# Generate tags for editors 1438# --------------------------------------------------------------------------- 1439quiet_cmd_tags = GEN $@ 1440 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1441 1442tags TAGS cscope gtags: FORCE 1443 $(call cmd,tags) 1444 1445# Scripts to check various things for consistency 1446# --------------------------------------------------------------------------- 1447 1448PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1449 1450includecheck: 1451 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1452 -name '*.[hcS]' -type f -print | sort \ 1453 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1454 1455versioncheck: 1456 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1457 -name '*.[hcS]' -type f -print | sort \ 1458 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1459 1460coccicheck: 1461 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1462 1463namespacecheck: 1464 $(PERL) $(srctree)/scripts/namespace.pl 1465 1466export_report: 1467 $(PERL) $(srctree)/scripts/export_report.pl 1468 1469endif #ifeq ($(config-targets),1) 1470endif #ifeq ($(mixed-targets),1) 1471 1472PHONY += checkstack kernelrelease kernelversion image_name 1473 1474# UML needs a little special treatment here. It wants to use the host 1475# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1476# else wants $(ARCH), including people doing cross-builds, which means 1477# that $(SUBARCH) doesn't work here. 1478ifeq ($(ARCH), um) 1479CHECKSTACK_ARCH := $(SUBARCH) 1480else 1481CHECKSTACK_ARCH := $(ARCH) 1482endif 1483checkstack: 1484 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1485 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1486 1487kernelrelease: 1488 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1489 1490kernelversion: 1491 @echo $(KERNELVERSION) 1492 1493image_name: 1494 @echo $(KBUILD_IMAGE) 1495 1496# Clear a bunch of variables before executing the submake 1497tools/: FORCE 1498 $(Q)mkdir -p $(objtree)/tools 1499 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ 1500 1501tools/%: FORCE 1502 $(Q)mkdir -p $(objtree)/tools 1503 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $* 1504 1505# Single targets 1506# --------------------------------------------------------------------------- 1507# Single targets are compatible with: 1508# - build with mixed source and output 1509# - build with separate output dir 'make O=...' 1510# - external modules 1511# 1512# target-dir => where to store outputfile 1513# build-dir => directory in kernel source tree to use 1514 1515ifeq ($(KBUILD_EXTMOD),) 1516 build-dir = $(patsubst %/,%,$(dir $@)) 1517 target-dir = $(dir $@) 1518else 1519 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1520 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1521 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1522endif 1523 1524%.s: %.c prepare scripts FORCE 1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1526%.i: %.c prepare scripts FORCE 1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1528%.o: %.c prepare scripts FORCE 1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1530%.lst: %.c prepare scripts FORCE 1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1532%.s: %.S prepare scripts FORCE 1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1534%.o: %.S prepare scripts FORCE 1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1536%.symtypes: %.c prepare scripts FORCE 1537 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1538 1539# Modules 1540/: prepare scripts FORCE 1541 $(cmd_crmodverdir) 1542 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1543 $(build)=$(build-dir) 1544# Make sure the latest headers are built for Documentation 1545Documentation/: headers_install 1546%/: prepare scripts FORCE 1547 $(cmd_crmodverdir) 1548 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1549 $(build)=$(build-dir) 1550%.ko: prepare scripts FORCE 1551 $(cmd_crmodverdir) 1552 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1553 $(build)=$(build-dir) $(@:.ko=.o) 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1555 1556# FIXME Should go into a make.lib or something 1557# =========================================================================== 1558 1559quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1560 cmd_rmdirs = rm -rf $(rm-dirs) 1561 1562quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1563 cmd_rmfiles = rm -f $(rm-files) 1564 1565# Run depmod only if we have System.map and depmod is executable 1566quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1567 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1568 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1569 1570# Create temporary dir for module support files 1571# clean it up only when building all modules 1572cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1573 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1574 1575# read all saved command lines 1576 1577targets := $(wildcard $(sort $(targets))) 1578cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1579 1580ifneq ($(cmd_files),) 1581 $(cmd_files): ; # Do not try to update included dependency files 1582 include $(cmd_files) 1583endif 1584 1585endif # skip-makefile 1586 1587PHONY += FORCE 1588FORCE: 1589 1590# Declare the contents of the .PHONY variable as phony. We keep that 1591# information in a variable so we can use it in if_changed and friends. 1592.PHONY: $(PHONY) 1593