1VERSION = 3 2PATCHLEVEL = 19 3SUBLEVEL = 0 4EXTRAVERSION = -rc1 5NAME = Diseased Newt 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 use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15MAKEFLAGS += -rR 16 17# Avoid funny character set dependencies 18unexport LC_ALL 19LC_COLLATE=C 20LC_NUMERIC=C 21export LC_COLLATE LC_NUMERIC 22 23# Avoid interference with shell env settings 24unexport GREP_OPTIONS 25 26# We are using a recursive build, so we need to do a little thinking 27# to get the ordering right. 28# 29# Most importantly: sub-Makefiles should only ever modify files in 30# their own directory. If in some directory we have a dependency on 31# a file in another dir (which doesn't happen often, but it's often 32# unavoidable when linking the built-in.o targets which finally 33# turn into vmlinux), we will call a sub make in that other dir, and 34# after that we are sure that everything which is in that other dir 35# is now up to date. 36# 37# The only cases where we need to modify files which have global 38# effects are thus separated out and done before the recursive 39# descending is started. They are now explicitly listed as the 40# prepare rule. 41 42# Beautify output 43# --------------------------------------------------------------------------- 44# 45# Normally, we echo the whole command before executing it. By making 46# that echo $($(quiet)$(cmd)), we now have the possibility to set 47# $(quiet) to choose other forms of output instead, e.g. 48# 49# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 50# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 51# 52# If $(quiet) is empty, the whole command will be printed. 53# If it is set to "quiet_", only the short version will be printed. 54# If it is set to "silent_", nothing will be printed at all, since 55# the variable $(silent_cmd_cc_o_c) doesn't exist. 56# 57# A simple variant is to prefix commands with $(Q) - that's useful 58# for commands that shall be hidden in non-verbose mode. 59# 60# $(Q)ln $@ :< 61# 62# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 63# If KBUILD_VERBOSE equals 1 then the above command is displayed. 64# 65# To put more focus on warnings, be less verbose as default 66# Use 'make V=1' to see the full commands 67 68ifeq ("$(origin V)", "command line") 69 KBUILD_VERBOSE = $(V) 70endif 71ifndef KBUILD_VERBOSE 72 KBUILD_VERBOSE = 0 73endif 74 75ifeq ($(KBUILD_VERBOSE),1) 76 quiet = 77 Q = 78else 79 quiet=quiet_ 80 Q = @ 81endif 82 83# If the user is running make -s (silent mode), suppress echoing of 84# commands 85 86ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 88 quiet=silent_ 89endif 90else # make-3.8x 91ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 92 quiet=silent_ 93endif 94endif 95 96export quiet Q KBUILD_VERBOSE 97 98# kbuild supports saving output files in a separate directory. 99# To locate output files in a separate directory two syntaxes are supported. 100# In both cases the working directory must be the root of the kernel src. 101# 1) O= 102# Use "make O=dir/to/store/output/files/" 103# 104# 2) Set KBUILD_OUTPUT 105# Set the environment variable KBUILD_OUTPUT to point to the directory 106# where the output files shall be placed. 107# export KBUILD_OUTPUT=dir/to/store/output/files/ 108# make 109# 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment 111# variable. 112 113# KBUILD_SRC is set on invocation of make in OBJ directory 114# KBUILD_SRC is not intended to be used by the regular user (for now) 115ifeq ($(KBUILD_SRC),) 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123# That's our default target when none is given on the command line 124PHONY := _all 125_all: 126 127# Cancel implicit rules on top Makefile 128$(CURDIR)/Makefile Makefile: ; 129 130ifneq ($(KBUILD_OUTPUT),) 131# Invoke a second make in the output directory, passing relevant variables 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && /bin/pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144sub-make: FORCE 145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 147 148# Leave processing to above invocation of make 149skip-makefile := 1 150endif # ifneq ($(KBUILD_OUTPUT),) 151endif # ifeq ($(KBUILD_SRC),) 152 153# We process the rest of the Makefile if this is the final invocation of make 154ifeq ($(skip-makefile),) 155 156# Do not print "Entering directory ...", 157# but we want to display it when entering to the output directory 158# so that IDEs/editors are able to understand relative filenames. 159MAKEFLAGS += --no-print-directory 160 161# Call a source code checker (by default, "sparse") as part of the 162# C compilation. 163# 164# Use 'make C=1' to enable checking of only re-compiled files. 165# Use 'make C=2' to enable checking of *all* source files, regardless 166# of whether they are re-compiled or not. 167# 168# See the file "Documentation/sparse.txt" for more details, including 169# where to get the "sparse" utility. 170 171ifeq ("$(origin C)", "command line") 172 KBUILD_CHECKSRC = $(C) 173endif 174ifndef KBUILD_CHECKSRC 175 KBUILD_CHECKSRC = 0 176endif 177 178# Use make M=dir to specify directory of external module to build 179# Old syntax make ... SUBDIRS=$PWD is still supported 180# Setting the environment variable KBUILD_EXTMOD take precedence 181ifdef SUBDIRS 182 KBUILD_EXTMOD ?= $(SUBDIRS) 183endif 184 185ifeq ("$(origin M)", "command line") 186 KBUILD_EXTMOD := $(M) 187endif 188 189# If building an external module we do not care about the all: rule 190# but instead _all depend on modules 191PHONY += all 192ifeq ($(KBUILD_EXTMOD),) 193_all: all 194else 195_all: modules 196endif 197 198ifeq ($(KBUILD_SRC),) 199 # building in the source tree 200 srctree := . 201else 202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 203 # building in a subdirectory of the source tree 204 srctree := .. 205 else 206 srctree := $(KBUILD_SRC) 207 endif 208endif 209objtree := . 210src := $(srctree) 211obj := $(objtree) 212 213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 214 215export srctree objtree VPATH 216 217 218# 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 $(CC) -v 2>&1 | grep -c "clang version"), 1) 340COMPILER := clang 341else 342COMPILER := gcc 343endif 344export COMPILER 345endif 346 347# Look for make include files relative to root of kernel src 348MAKEFLAGS += --include-dir=$(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 369PYTHON = python 370CHECK = sparse 371 372CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 373 -Wbitwise -Wno-return-void $(CF) 374CFLAGS_MODULE = 375AFLAGS_MODULE = 376LDFLAGS_MODULE = 377CFLAGS_KERNEL = 378AFLAGS_KERNEL = 379CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 380 381 382# Use USERINCLUDE when you must reference the UAPI directories only. 383USERINCLUDE := \ 384 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 385 -Iarch/$(hdr-arch)/include/generated/uapi \ 386 -I$(srctree)/include/uapi \ 387 -Iinclude/generated/uapi \ 388 -include $(srctree)/include/linux/kconfig.h 389 390# Use LINUXINCLUDE when you must reference the include/ directory. 391# Needed to be compatible with the O= option 392LINUXINCLUDE := \ 393 -I$(srctree)/arch/$(hdr-arch)/include \ 394 -Iarch/$(hdr-arch)/include/generated \ 395 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 396 -Iinclude \ 397 $(USERINCLUDE) 398 399KBUILD_CPPFLAGS := -D__KERNEL__ 400 401KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 402 -fno-strict-aliasing -fno-common \ 403 -Werror-implicit-function-declaration \ 404 -Wno-format-security \ 405 -std=gnu89 406 407KBUILD_AFLAGS_KERNEL := 408KBUILD_CFLAGS_KERNEL := 409KBUILD_AFLAGS := -D__ASSEMBLY__ 410KBUILD_AFLAGS_MODULE := -DMODULE 411KBUILD_CFLAGS_MODULE := -DMODULE 412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 413 414# Read KERNELRELEASE from include/config/kernel.release (if it exists) 415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 417 418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 420export CPP AR NM STRIP OBJCOPY OBJDUMP 421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 423 424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 429export KBUILD_ARFLAGS 430 431# When compiling out-of-tree modules, put MODVERDIR in the module 432# tree rather than in the kernel tree. The kernel tree might 433# even be read-only. 434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 435 436# Files to ignore in find ... statements 437 438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 439 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 440 -prune -o 441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 442 --exclude CVS --exclude .pc --exclude .hg --exclude .git 443 444# =========================================================================== 445# Rules shared between *config targets and build targets 446 447# Basic helpers built in scripts/ 448PHONY += scripts_basic 449scripts_basic: 450 $(Q)$(MAKE) $(build)=scripts/basic 451 $(Q)rm -f .tmp_quiet_recordmcount 452 453# To avoid any implicit rule to kick in, define an empty command. 454scripts/basic/%: scripts_basic ; 455 456PHONY += outputmakefile 457# outputmakefile generates a Makefile in the output directory, if using a 458# separate output directory. This allows convenient use of make in the 459# output directory. 460outputmakefile: 461ifneq ($(KBUILD_SRC),) 462 $(Q)ln -fsn $(srctree) source 463 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 464 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 465endif 466 467# Support for using generic headers in asm-generic 468PHONY += asm-generic 469asm-generic: 470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 471 src=asm obj=arch/$(SRCARCH)/include/generated/asm 472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 473 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 474 475# To make sure we do not include .config for any of the *config targets 476# catch them early, and hand them over to scripts/kconfig/Makefile 477# It is allowed to specify more targets when calling make, including 478# mixing *config targets and build targets. 479# For example 'make oldconfig all'. 480# Detect when mixed targets is specified, and make a second invocation 481# of make so .config is not included in this case either (for *config). 482 483version_h := include/generated/uapi/linux/version.h 484old_version_h := include/linux/version.h 485 486no-dot-config-targets := clean mrproper distclean \ 487 cscope gtags TAGS tags help% %docs check% coccicheck \ 488 $(version_h) headers_% archheaders archscripts \ 489 kernelversion %src-pkg 490 491config-targets := 0 492mixed-targets := 0 493dot-config := 1 494 495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 497 dot-config := 0 498 endif 499endif 500 501ifeq ($(KBUILD_EXTMOD),) 502 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 503 config-targets := 1 504 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 505 mixed-targets := 1 506 endif 507 endif 508endif 509 510ifeq ($(mixed-targets),1) 511# =========================================================================== 512# We're called with mixed targets (*config and build targets). 513# Handle them one by one. 514 515PHONY += $(MAKECMDGOALS) __build_one_by_one 516 517$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 518 @: 519 520__build_one_by_one: 521 $(Q)set -e; \ 522 for i in $(MAKECMDGOALS); do \ 523 $(MAKE) -f $(srctree)/Makefile $$i; \ 524 done 525 526else 527ifeq ($(config-targets),1) 528# =========================================================================== 529# *config targets only - make sure prerequisites are updated, and descend 530# in scripts/kconfig to make the *config target 531 532# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 533# KBUILD_DEFCONFIG may point out an alternative default configuration 534# used for 'make defconfig' 535include $(srctree)/arch/$(SRCARCH)/Makefile 536export KBUILD_DEFCONFIG KBUILD_KCONFIG 537 538config: scripts_basic outputmakefile FORCE 539 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 540 541%config: scripts_basic outputmakefile FORCE 542 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 543 544else 545# =========================================================================== 546# Build targets only - this includes vmlinux, arch specific targets, clean 547# targets and others. In general all targets except *config targets. 548 549ifeq ($(KBUILD_EXTMOD),) 550# Additional helpers built in scripts/ 551# Carefully list dependencies so we do not try to build scripts twice 552# in parallel 553PHONY += scripts 554scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 555 asm-generic 556 $(Q)$(MAKE) $(build)=$(@) 557 558# Objects we will link into vmlinux / subdirs we need to visit 559init-y := init/ 560drivers-y := drivers/ sound/ firmware/ 561net-y := net/ 562libs-y := lib/ 563core-y := usr/ 564endif # KBUILD_EXTMOD 565 566ifeq ($(dot-config),1) 567# Read in config 568-include include/config/auto.conf 569 570ifeq ($(KBUILD_EXTMOD),) 571# Read in dependencies to all Kconfig* files, make sure to run 572# oldconfig if changes are detected. 573-include include/config/auto.conf.cmd 574 575# To avoid any implicit rule to kick in, define an empty command 576$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 577 578# If .config is newer than include/config/auto.conf, someone tinkered 579# with it and forgot to run make oldconfig. 580# if auto.conf.cmd is missing then we are probably in a cleaned tree so 581# we execute the config step to be sure to catch updated Kconfig files 582include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 583 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 584else 585# external modules needs include/generated/autoconf.h and include/config/auto.conf 586# but do not care if they are up-to-date. Use auto.conf to trigger the test 587PHONY += include/config/auto.conf 588 589include/config/auto.conf: 590 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 591 echo >&2; \ 592 echo >&2 " ERROR: Kernel configuration is invalid."; \ 593 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 594 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 595 echo >&2 ; \ 596 /bin/false) 597 598endif # KBUILD_EXTMOD 599 600else 601# Dummy target needed, because used as prerequisite 602include/config/auto.conf: ; 603endif # $(dot-config) 604 605# The all: target is the default when no target is given on the 606# command line. 607# This allow a user to issue only 'make' to build a kernel including modules 608# Defaults to vmlinux, but the arch makefile usually adds further targets 609all: vmlinux 610 611include $(srctree)/arch/$(SRCARCH)/Makefile 612 613KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 614 615ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 616KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 617else 618KBUILD_CFLAGS += -O2 619endif 620 621# Tell gcc to never replace conditional load with a non-conditional one 622KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 623 624ifdef CONFIG_READABLE_ASM 625# Disable optimizations that make assembler listings hard to read. 626# reorder blocks reorders the control in the function 627# ipa clone creates specialized cloned functions 628# partial inlining inlines only parts of functions 629KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 630 $(call cc-option,-fno-ipa-cp-clone,) \ 631 $(call cc-option,-fno-partial-inlining) 632endif 633 634ifneq ($(CONFIG_FRAME_WARN),0) 635KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 636endif 637 638# Handle stack protector mode. 639# 640# Since kbuild can potentially perform two passes (first with the old 641# .config values and then with updated .config values), we cannot error out 642# if a desired compiler option is unsupported. If we were to error, kbuild 643# could never get to the second pass and actually notice that we changed 644# the option to something that was supported. 645# 646# Additionally, we don't want to fallback and/or silently change which compiler 647# flags will be used, since that leads to producing kernels with different 648# security feature characteristics depending on the compiler used. ("But I 649# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 650# 651# The middle ground is to warn here so that the failed option is obvious, but 652# to let the build fail with bad compiler flags so that we can't produce a 653# kernel when there is a CONFIG and compiler mismatch. 654# 655ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 656 stackp-flag := -fstack-protector 657 ifeq ($(call cc-option, $(stackp-flag)),) 658 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 659 -fstack-protector not supported by compiler) 660 endif 661else 662ifdef CONFIG_CC_STACKPROTECTOR_STRONG 663 stackp-flag := -fstack-protector-strong 664 ifeq ($(call cc-option, $(stackp-flag)),) 665 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 666 -fstack-protector-strong not supported by compiler) 667 endif 668else 669 # Force off for distro compilers that enable stack protector by default. 670 stackp-flag := $(call cc-option, -fno-stack-protector) 671endif 672endif 673KBUILD_CFLAGS += $(stackp-flag) 674 675ifeq ($(COMPILER),clang) 676KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 677KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 678KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 679KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 680KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 681# Quiet clang warning: comparison of unsigned expression < 0 is always false 682KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 683# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 684# source of a reference will be _MergedGlobals and not on of the whitelisted names. 685# See modpost pattern 2 686KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 687KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 688else 689 690# This warning generated too much noise in a regular build. 691# Use make W=1 to enable this warning (see scripts/Makefile.build) 692KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 693endif 694 695ifdef CONFIG_FRAME_POINTER 696KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 697else 698# Some targets (ARM with Thumb2, for example), can't be built with frame 699# pointers. For those, we don't have FUNCTION_TRACER automatically 700# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 701# incompatible with -fomit-frame-pointer with current GCC, so we don't use 702# -fomit-frame-pointer with FUNCTION_TRACER. 703ifndef CONFIG_FUNCTION_TRACER 704KBUILD_CFLAGS += -fomit-frame-pointer 705endif 706endif 707 708KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 709 710ifdef CONFIG_DEBUG_INFO 711ifdef CONFIG_DEBUG_INFO_SPLIT 712KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 713else 714KBUILD_CFLAGS += -g 715endif 716KBUILD_AFLAGS += -Wa,-gdwarf-2 717endif 718ifdef CONFIG_DEBUG_INFO_DWARF4 719KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 720endif 721 722ifdef CONFIG_DEBUG_INFO_REDUCED 723KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 724 $(call cc-option,-fno-var-tracking) 725endif 726 727ifdef CONFIG_FUNCTION_TRACER 728ifdef CONFIG_HAVE_FENTRY 729CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 730endif 731KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 732KBUILD_AFLAGS += $(CC_USING_FENTRY) 733ifdef CONFIG_DYNAMIC_FTRACE 734 ifdef CONFIG_HAVE_C_RECORDMCOUNT 735 BUILD_C_RECORDMCOUNT := y 736 export BUILD_C_RECORDMCOUNT 737 endif 738endif 739endif 740 741# We trigger additional mismatches with less inlining 742ifdef CONFIG_DEBUG_SECTION_MISMATCH 743KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 744endif 745 746# arch Makefile may override CC so keep this after arch Makefile is included 747NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 748CHECKFLAGS += $(NOSTDINC_FLAGS) 749 750# warn about C99 declaration after statement 751KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 752 753# disable pointer signed / unsigned warnings in gcc 4.0 754KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 755 756# disable invalid "can't wrap" optimizations for signed / pointers 757KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 758 759# conserve stack if available 760KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 761 762# disallow errors like 'EXPORT_GPL(foo);' with missing header 763KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 764 765# require functions to have arguments in prototypes, not empty 'int foo()' 766KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 767 768# Prohibit date/time macros, which would make the build non-deterministic 769KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 770 771# use the deterministic mode of AR if available 772KBUILD_ARFLAGS := $(call ar-option,D) 773 774# check for 'asm goto' 775ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 776 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 777endif 778 779include $(srctree)/scripts/Makefile.extrawarn 780 781# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 782KBUILD_CPPFLAGS += $(KCPPFLAGS) 783KBUILD_AFLAGS += $(KAFLAGS) 784KBUILD_CFLAGS += $(KCFLAGS) 785 786# Use --build-id when available. 787LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 788 $(call cc-ldoption, -Wl$(comma)--build-id,)) 789KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 790LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 791 792ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 793LDFLAGS_vmlinux += $(call ld-option, -X,) 794endif 795 796# Default kernel image to build when no specific target is given. 797# KBUILD_IMAGE may be overruled on the command line or 798# set in the environment 799# Also any assignments in arch/$(ARCH)/Makefile take precedence over 800# this default value 801export KBUILD_IMAGE ?= vmlinux 802 803# 804# INSTALL_PATH specifies where to place the updated kernel and system map 805# images. Default is /boot, but you can set it to other values 806export INSTALL_PATH ?= /boot 807 808# 809# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 810# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 811# an argument if needed. Otherwise it defaults to the kernel install path 812# 813export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 814 815# 816# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 817# relocations required by build roots. This is not defined in the 818# makefile but the argument can be passed to make if needed. 819# 820 821MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 822export MODLIB 823 824# 825# INSTALL_MOD_STRIP, if defined, will cause modules to be 826# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 827# the default option --strip-debug will be used. Otherwise, 828# INSTALL_MOD_STRIP value will be used as the options to the strip command. 829 830ifdef INSTALL_MOD_STRIP 831ifeq ($(INSTALL_MOD_STRIP),1) 832mod_strip_cmd = $(STRIP) --strip-debug 833else 834mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 835endif # INSTALL_MOD_STRIP=1 836else 837mod_strip_cmd = true 838endif # INSTALL_MOD_STRIP 839export mod_strip_cmd 840 841# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 842# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 843# or CONFIG_MODULE_COMPRESS_XZ. 844 845mod_compress_cmd = true 846ifdef CONFIG_MODULE_COMPRESS 847 ifdef CONFIG_MODULE_COMPRESS_GZIP 848 mod_compress_cmd = gzip -n 849 endif # CONFIG_MODULE_COMPRESS_GZIP 850 ifdef CONFIG_MODULE_COMPRESS_XZ 851 mod_compress_cmd = xz 852 endif # CONFIG_MODULE_COMPRESS_XZ 853endif # CONFIG_MODULE_COMPRESS 854export mod_compress_cmd 855 856# Select initial ramdisk compression format, default is gzip(1). 857# This shall be used by the dracut(8) tool while creating an initramfs image. 858# 859INITRD_COMPRESS-y := gzip 860INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 861INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 862INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 863INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 864INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 865# do not export INITRD_COMPRESS, since we didn't actually 866# choose a sane default compression above. 867# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 868 869ifdef CONFIG_MODULE_SIG_ALL 870MODSECKEY = ./signing_key.priv 871MODPUBKEY = ./signing_key.x509 872export MODPUBKEY 873mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 874else 875mod_sign_cmd = true 876endif 877export mod_sign_cmd 878 879 880ifeq ($(KBUILD_EXTMOD),) 881core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 882 883vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 884 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 885 $(net-y) $(net-m) $(libs-y) $(libs-m))) 886 887vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 888 $(init-) $(core-) $(drivers-) $(net-) $(libs-)))) 889 890init-y := $(patsubst %/, %/built-in.o, $(init-y)) 891core-y := $(patsubst %/, %/built-in.o, $(core-y)) 892drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 893net-y := $(patsubst %/, %/built-in.o, $(net-y)) 894libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 895libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 896libs-y := $(libs-y1) $(libs-y2) 897 898# Externally visible symbols (used by link-vmlinux.sh) 899export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 900export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 901export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 902export LDFLAGS_vmlinux 903# used by scripts/pacmage/Makefile 904export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 905 906vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 907 908# Final link of vmlinux 909 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 910quiet_cmd_link-vmlinux = LINK $@ 911 912# Include targets which we want to 913# execute if the rest of the kernel build went well. 914vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 915ifdef CONFIG_HEADERS_CHECK 916 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 917endif 918ifdef CONFIG_SAMPLES 919 $(Q)$(MAKE) $(build)=samples 920endif 921ifdef CONFIG_BUILD_DOCSRC 922 $(Q)$(MAKE) $(build)=Documentation 923endif 924 +$(call if_changed,link-vmlinux) 925 926# The actual objects are generated when descending, 927# make sure no implicit rule kicks in 928$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 929 930# Handle descending into subdirectories listed in $(vmlinux-dirs) 931# Preset locale variables to speed up the build process. Limit locale 932# tweaks to this spot to avoid wrong language settings when running 933# make menuconfig etc. 934# Error messages still appears in the original language 935 936PHONY += $(vmlinux-dirs) 937$(vmlinux-dirs): prepare scripts 938 $(Q)$(MAKE) $(build)=$@ 939 940define filechk_kernel.release 941 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 942endef 943 944# Store (new) KERNELRELEASE string in include/config/kernel.release 945include/config/kernel.release: include/config/auto.conf FORCE 946 $(call filechk,kernel.release) 947 948 949# Things we need to do before we recursively start building the kernel 950# or the modules are listed in "prepare". 951# A multi level approach is used. prepareN is processed before prepareN-1. 952# archprepare is used in arch Makefiles and when processed asm symlink, 953# version.h and scripts_basic is processed / created. 954 955# Listed in dependency order 956PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 957 958# prepare3 is used to check if we are building in a separate output directory, 959# and if so do: 960# 1) Check that make has not been executed in the kernel src $(srctree) 961prepare3: include/config/kernel.release 962ifneq ($(KBUILD_SRC),) 963 @$(kecho) ' Using $(srctree) as source for kernel' 964 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 965 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 966 echo >&2 " in the '$(srctree)' directory.";\ 967 /bin/false; \ 968 fi; 969endif 970 971# prepare2 creates a makefile if using a separate output directory 972prepare2: prepare3 outputmakefile asm-generic 973 974prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 975 include/config/auto.conf 976 $(cmd_crmodverdir) 977 978archprepare: archheaders archscripts prepare1 scripts_basic 979 980prepare0: archprepare FORCE 981 $(Q)$(MAKE) $(build)=. 982 983# All the preparing.. 984prepare: prepare0 985 986# Generate some files 987# --------------------------------------------------------------------------- 988 989# KERNELRELEASE can change from a few different places, meaning version.h 990# needs to be updated, so this check is forced on all builds 991 992uts_len := 64 993define filechk_utsrelease.h 994 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 995 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 996 exit 1; \ 997 fi; \ 998 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 999endef 1000 1001define filechk_version.h 1002 (echo \#define LINUX_VERSION_CODE $(shell \ 1003 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1004 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1005endef 1006 1007$(version_h): $(srctree)/Makefile FORCE 1008 $(call filechk,version.h) 1009 $(Q)rm -f $(old_version_h) 1010 1011include/generated/utsrelease.h: include/config/kernel.release FORCE 1012 $(call filechk,utsrelease.h) 1013 1014PHONY += headerdep 1015headerdep: 1016 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1017 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1018 1019# --------------------------------------------------------------------------- 1020 1021PHONY += depend dep 1022depend dep: 1023 @echo '*** Warning: make $@ is unnecessary now.' 1024 1025# --------------------------------------------------------------------------- 1026# Firmware install 1027INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1028export INSTALL_FW_PATH 1029 1030PHONY += firmware_install 1031firmware_install: FORCE 1032 @mkdir -p $(objtree)/firmware 1033 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1034 1035# --------------------------------------------------------------------------- 1036# Kernel headers 1037 1038#Default location for installed headers 1039export INSTALL_HDR_PATH = $(objtree)/usr 1040 1041# If we do an all arch process set dst to asm-$(hdr-arch) 1042hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1043 1044PHONY += archheaders 1045archheaders: 1046 1047PHONY += archscripts 1048archscripts: 1049 1050PHONY += __headers 1051__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1052 $(Q)$(MAKE) $(build)=scripts build_unifdef 1053 1054PHONY += headers_install_all 1055headers_install_all: 1056 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1057 1058PHONY += headers_install 1059headers_install: __headers 1060 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1061 $(error Headers not exportable for the $(SRCARCH) architecture)) 1062 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1063 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1064 1065PHONY += headers_check_all 1066headers_check_all: headers_install_all 1067 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1068 1069PHONY += headers_check 1070headers_check: headers_install 1071 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1072 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1073 1074# --------------------------------------------------------------------------- 1075# Kernel selftest 1076 1077PHONY += kselftest 1078kselftest: 1079 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1080 1081# --------------------------------------------------------------------------- 1082# Modules 1083 1084ifdef CONFIG_MODULES 1085 1086# By default, build modules as well 1087 1088all: modules 1089 1090# Build modules 1091# 1092# A module can be listed more than once in obj-m resulting in 1093# duplicate lines in modules.order files. Those are removed 1094# using awk while concatenating to the final file. 1095 1096PHONY += modules 1097modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1098 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1099 @$(kecho) ' Building modules, stage 2.'; 1100 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1102 1103modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1104 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1105 1106%/modules.builtin: include/config/auto.conf 1107 $(Q)$(MAKE) $(modbuiltin)=$* 1108 1109 1110# Target to prepare building external modules 1111PHONY += modules_prepare 1112modules_prepare: prepare scripts 1113 1114# Target to install modules 1115PHONY += modules_install 1116modules_install: _modinst_ _modinst_post 1117 1118PHONY += _modinst_ 1119_modinst_: 1120 @rm -rf $(MODLIB)/kernel 1121 @rm -f $(MODLIB)/source 1122 @mkdir -p $(MODLIB)/kernel 1123 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1124 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1125 rm -f $(MODLIB)/build ; \ 1126 ln -s $(CURDIR) $(MODLIB)/build ; \ 1127 fi 1128 @cp -f $(objtree)/modules.order $(MODLIB)/ 1129 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1130 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1131 1132# This depmod is only for convenience to give the initial 1133# boot a modules.dep even before / is mounted read-write. However the 1134# boot script depmod is the master version. 1135PHONY += _modinst_post 1136_modinst_post: _modinst_ 1137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1138 $(call cmd,depmod) 1139 1140ifeq ($(CONFIG_MODULE_SIG), y) 1141PHONY += modules_sign 1142modules_sign: 1143 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1144endif 1145 1146else # CONFIG_MODULES 1147 1148# Modules not configured 1149# --------------------------------------------------------------------------- 1150 1151modules modules_install: FORCE 1152 @echo >&2 1153 @echo >&2 "The present kernel configuration has modules disabled." 1154 @echo >&2 "Type 'make config' and enable loadable module support." 1155 @echo >&2 "Then build a kernel with module support enabled." 1156 @echo >&2 1157 @exit 1 1158 1159endif # CONFIG_MODULES 1160 1161### 1162# Cleaning is done on three levels. 1163# make clean Delete most generated files 1164# Leave enough to build external modules 1165# make mrproper Delete the current configuration, and all generated files 1166# make distclean Remove editor backup files, patch leftover files and the like 1167 1168# Directories & files removed with 'make clean' 1169CLEAN_DIRS += $(MODVERDIR) 1170 1171# Directories & files removed with 'make mrproper' 1172MRPROPER_DIRS += include/config usr/include include/generated \ 1173 arch/*/include/generated .tmp_objdiff 1174MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1175 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1176 signing_key.priv signing_key.x509 x509.genkey \ 1177 extra_certificates signing_key.x509.keyid \ 1178 signing_key.x509.signer 1179 1180# clean - Delete most, but leave enough to build external modules 1181# 1182clean: rm-dirs := $(CLEAN_DIRS) 1183clean: rm-files := $(CLEAN_FILES) 1184clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1185 1186PHONY += $(clean-dirs) clean archclean vmlinuxclean 1187$(clean-dirs): 1188 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1189 1190vmlinuxclean: 1191 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1192 1193clean: archclean vmlinuxclean 1194 1195# mrproper - Delete all generated files, including .config 1196# 1197mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1198mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1199mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1200 1201PHONY += $(mrproper-dirs) mrproper archmrproper 1202$(mrproper-dirs): 1203 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1204 1205mrproper: clean archmrproper $(mrproper-dirs) 1206 $(call cmd,rmdirs) 1207 $(call cmd,rmfiles) 1208 1209# distclean 1210# 1211PHONY += distclean 1212 1213distclean: mrproper 1214 @find $(srctree) $(RCS_FIND_IGNORE) \ 1215 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1216 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1217 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1218 -type f -print | xargs rm -f 1219 1220 1221# Packaging of the kernel to various formats 1222# --------------------------------------------------------------------------- 1223# rpm target kept for backward compatibility 1224package-dir := scripts/package 1225 1226%src-pkg: FORCE 1227 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1228%pkg: include/config/kernel.release FORCE 1229 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1230rpm: include/config/kernel.release FORCE 1231 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1232 1233 1234# Brief documentation of the typical targets used 1235# --------------------------------------------------------------------------- 1236 1237boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1238boards := $(sort $(notdir $(boards))) 1239board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1240board-dirs := $(sort $(notdir $(board-dirs:/=))) 1241 1242help: 1243 @echo 'Cleaning targets:' 1244 @echo ' clean - Remove most generated files but keep the config and' 1245 @echo ' enough build support to build external modules' 1246 @echo ' mrproper - Remove all generated files + config + various backup files' 1247 @echo ' distclean - mrproper + remove editor backup and patch files' 1248 @echo '' 1249 @echo 'Configuration targets:' 1250 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1251 @echo '' 1252 @echo 'Other generic targets:' 1253 @echo ' all - Build all targets marked with [*]' 1254 @echo '* vmlinux - Build the bare kernel' 1255 @echo '* modules - Build all modules' 1256 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1257 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1258 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1259 @echo ' dir/ - Build all files in dir and below' 1260 @echo ' dir/file.[oisS] - Build specified target only' 1261 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1262 @echo ' (requires a recent binutils and recent build (System.map))' 1263 @echo ' dir/file.ko - Build module including final link' 1264 @echo ' modules_prepare - Set up for building external modules' 1265 @echo ' tags/TAGS - Generate tags file for editors' 1266 @echo ' cscope - Generate cscope index' 1267 @echo ' gtags - Generate GNU GLOBAL index' 1268 @echo ' kernelrelease - Output the release version string (use with make -s)' 1269 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1270 @echo ' image_name - Output the image name (use with make -s)' 1271 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1272 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1273 echo '' 1274 @echo 'Static analysers' 1275 @echo ' checkstack - Generate a list of stack hogs' 1276 @echo ' namespacecheck - Name space analysis on compiled kernel' 1277 @echo ' versioncheck - Sanity check on version.h usage' 1278 @echo ' includecheck - Check for duplicate included header files' 1279 @echo ' export_report - List the usages of all exported symbols' 1280 @echo ' headers_check - Sanity check on exported headers' 1281 @echo ' headerdep - Detect inclusion cycles in headers' 1282 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1283 @echo '' 1284 @echo 'Kernel selftest' 1285 @echo ' kselftest - Build and run kernel selftest (run as root)' 1286 @echo ' Build, install, and boot kernel before' 1287 @echo ' running kselftest on it' 1288 @echo '' 1289 @echo 'Kernel packaging:' 1290 @$(MAKE) $(build)=$(package-dir) help 1291 @echo '' 1292 @echo 'Documentation targets:' 1293 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1294 @echo '' 1295 @echo 'Architecture specific targets ($(SRCARCH)):' 1296 @$(if $(archhelp),$(archhelp),\ 1297 echo ' No architecture specific help defined for $(SRCARCH)') 1298 @echo '' 1299 @$(if $(boards), \ 1300 $(foreach b, $(boards), \ 1301 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1302 echo '') 1303 @$(if $(board-dirs), \ 1304 $(foreach b, $(board-dirs), \ 1305 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1306 printf " %-16s - Show all of the above\\n" help-boards; \ 1307 echo '') 1308 1309 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1310 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1311 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1312 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1313 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1314 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1315 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1316 @echo ' 1: warnings which may be relevant and do not occur too often' 1317 @echo ' 2: warnings which occur quite often but may still be relevant' 1318 @echo ' 3: more obscure warnings, can most likely be ignored' 1319 @echo ' Multiple levels can be combined with W=12 or W=123' 1320 @echo '' 1321 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1322 @echo 'For further info see the ./README file' 1323 1324 1325help-board-dirs := $(addprefix help-,$(board-dirs)) 1326 1327help-boards: $(help-board-dirs) 1328 1329boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1330 1331$(help-board-dirs): help-%: 1332 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1333 @$(if $(boards-per-dir), \ 1334 $(foreach b, $(boards-per-dir), \ 1335 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1336 echo '') 1337 1338 1339# Documentation targets 1340# --------------------------------------------------------------------------- 1341%docs: scripts_basic FORCE 1342 $(Q)$(MAKE) $(build)=scripts build_docproc 1343 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1344 1345else # KBUILD_EXTMOD 1346 1347### 1348# External module support. 1349# When building external modules the kernel used as basis is considered 1350# read-only, and no consistency checks are made and the make 1351# system is not used on the basis kernel. If updates are required 1352# in the basis kernel ordinary make commands (without M=...) must 1353# be used. 1354# 1355# The following are the only valid targets when building external 1356# modules. 1357# make M=dir clean Delete all automatically generated files 1358# make M=dir modules Make all modules in specified dir 1359# make M=dir Same as 'make M=dir modules' 1360# make M=dir modules_install 1361# Install the modules built in the module directory 1362# Assumes install directory is already created 1363 1364# We are always building modules 1365KBUILD_MODULES := 1 1366PHONY += crmodverdir 1367crmodverdir: 1368 $(cmd_crmodverdir) 1369 1370PHONY += $(objtree)/Module.symvers 1371$(objtree)/Module.symvers: 1372 @test -e $(objtree)/Module.symvers || ( \ 1373 echo; \ 1374 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1375 echo " is missing; modules will have no dependencies and modversions."; \ 1376 echo ) 1377 1378module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1379PHONY += $(module-dirs) modules 1380$(module-dirs): crmodverdir $(objtree)/Module.symvers 1381 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1382 1383modules: $(module-dirs) 1384 @$(kecho) ' Building modules, stage 2.'; 1385 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1386 1387PHONY += modules_install 1388modules_install: _emodinst_ _emodinst_post 1389 1390install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1391PHONY += _emodinst_ 1392_emodinst_: 1393 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1394 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1395 1396PHONY += _emodinst_post 1397_emodinst_post: _emodinst_ 1398 $(call cmd,depmod) 1399 1400clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1401 1402PHONY += $(clean-dirs) clean 1403$(clean-dirs): 1404 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1405 1406clean: rm-dirs := $(MODVERDIR) 1407clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1408 1409help: 1410 @echo ' Building external modules.' 1411 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1412 @echo '' 1413 @echo ' modules - default target, build the module(s)' 1414 @echo ' modules_install - install the module' 1415 @echo ' clean - remove generated files in module directory only' 1416 @echo '' 1417 1418# Dummies... 1419PHONY += prepare scripts 1420prepare: ; 1421scripts: ; 1422endif # KBUILD_EXTMOD 1423 1424clean: $(clean-dirs) 1425 $(call cmd,rmdirs) 1426 $(call cmd,rmfiles) 1427 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1428 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1429 -o -name '*.ko.*' \ 1430 -o -name '*.dwo' \ 1431 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1432 -o -name '*.symtypes' -o -name 'modules.order' \ 1433 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1434 -o -name '*.gcno' \) -type f -print | xargs rm -f 1435 1436# Generate tags for editors 1437# --------------------------------------------------------------------------- 1438quiet_cmd_tags = GEN $@ 1439 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1440 1441tags TAGS cscope gtags: FORCE 1442 $(call cmd,tags) 1443 1444# Scripts to check various things for consistency 1445# --------------------------------------------------------------------------- 1446 1447PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1448 1449includecheck: 1450 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1451 -name '*.[hcS]' -type f -print | sort \ 1452 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1453 1454versioncheck: 1455 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1456 -name '*.[hcS]' -type f -print | sort \ 1457 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1458 1459coccicheck: 1460 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1461 1462namespacecheck: 1463 $(PERL) $(srctree)/scripts/namespace.pl 1464 1465export_report: 1466 $(PERL) $(srctree)/scripts/export_report.pl 1467 1468endif #ifeq ($(config-targets),1) 1469endif #ifeq ($(mixed-targets),1) 1470 1471PHONY += checkstack kernelrelease kernelversion image_name 1472 1473# UML needs a little special treatment here. It wants to use the host 1474# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1475# else wants $(ARCH), including people doing cross-builds, which means 1476# that $(SUBARCH) doesn't work here. 1477ifeq ($(ARCH), um) 1478CHECKSTACK_ARCH := $(SUBARCH) 1479else 1480CHECKSTACK_ARCH := $(ARCH) 1481endif 1482checkstack: 1483 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1484 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1485 1486kernelrelease: 1487 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1488 1489kernelversion: 1490 @echo $(KERNELVERSION) 1491 1492image_name: 1493 @echo $(KBUILD_IMAGE) 1494 1495# Clear a bunch of variables before executing the submake 1496tools/: FORCE 1497 $(Q)mkdir -p $(objtree)/tools 1498 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1499 1500tools/%: FORCE 1501 $(Q)mkdir -p $(objtree)/tools 1502 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1503 1504# Single targets 1505# --------------------------------------------------------------------------- 1506# Single targets are compatible with: 1507# - build with mixed source and output 1508# - build with separate output dir 'make O=...' 1509# - external modules 1510# 1511# target-dir => where to store outputfile 1512# build-dir => directory in kernel source tree to use 1513 1514ifeq ($(KBUILD_EXTMOD),) 1515 build-dir = $(patsubst %/,%,$(dir $@)) 1516 target-dir = $(dir $@) 1517else 1518 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1519 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1520 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1521endif 1522 1523%.s: %.c prepare scripts FORCE 1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1525%.i: %.c prepare scripts FORCE 1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1527%.o: %.c prepare scripts FORCE 1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1529%.lst: %.c prepare scripts FORCE 1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1531%.s: %.S prepare scripts FORCE 1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1533%.o: %.S prepare scripts FORCE 1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1535%.symtypes: %.c prepare scripts FORCE 1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1537 1538# Modules 1539/: prepare scripts FORCE 1540 $(cmd_crmodverdir) 1541 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1542 $(build)=$(build-dir) 1543# Make sure the latest headers are built for Documentation 1544Documentation/: headers_install 1545%/: prepare scripts FORCE 1546 $(cmd_crmodverdir) 1547 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1548 $(build)=$(build-dir) 1549%.ko: prepare scripts FORCE 1550 $(cmd_crmodverdir) 1551 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1552 $(build)=$(build-dir) $(@:.ko=.o) 1553 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1554 1555# FIXME Should go into a make.lib or something 1556# =========================================================================== 1557 1558quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1559 cmd_rmdirs = rm -rf $(rm-dirs) 1560 1561quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1562 cmd_rmfiles = rm -f $(rm-files) 1563 1564# Run depmod only if we have System.map and depmod is executable 1565quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1566 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1567 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1568 1569# Create temporary dir for module support files 1570# clean it up only when building all modules 1571cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1572 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1573 1574# read all saved command lines 1575 1576targets := $(wildcard $(sort $(targets))) 1577cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1578 1579ifneq ($(cmd_files),) 1580 $(cmd_files): ; # Do not try to update included dependency files 1581 include $(cmd_files) 1582endif 1583 1584endif # skip-makefile 1585 1586PHONY += FORCE 1587FORCE: 1588 1589# Declare the contents of the .PHONY variable as phony. We keep that 1590# information in a variable so we can use it in if_changed and friends. 1591.PHONY: $(PHONY) 1592