1VERSION = 4 2PATCHLEVEL = 1 3SUBLEVEL = 0 4EXTRAVERSION = 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 217 218 219# SUBARCH tells the usermode build what the underlying arch is. That is set 220# first, and if a usermode build is happening, the "ARCH=um" on the command 221# line overrides the setting of ARCH below. If a native build is happening, 222# then ARCH is assigned, getting whatever value it gets normally, and 223# SUBARCH is subsequently ignored. 224 225SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 226 -e s/sun4u/sparc64/ \ 227 -e s/arm.*/arm/ -e s/sa110/arm/ \ 228 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 229 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 230 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 231 232# Cross compiling and selecting different set of gcc/bin-utils 233# --------------------------------------------------------------------------- 234# 235# When performing cross compilation for other architectures ARCH shall be set 236# to the target architecture. (See arch/* for the possibilities). 237# ARCH can be set during invocation of make: 238# make ARCH=ia64 239# Another way is to have ARCH set in the environment. 240# The default ARCH is the host where make is executed. 241 242# CROSS_COMPILE specify the prefix used for all executables used 243# during compilation. Only gcc and related bin-utils executables 244# are prefixed with $(CROSS_COMPILE). 245# CROSS_COMPILE can be set on the command line 246# make CROSS_COMPILE=ia64-linux- 247# Alternatively CROSS_COMPILE can be set in the environment. 248# A third alternative is to store a setting in .config so that plain 249# "make" in the configured kernel build directory always uses that. 250# Default value for CROSS_COMPILE is not to prefix executables 251# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 252ARCH ?= $(SUBARCH) 253CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 254 255# Architecture as present in compile.h 256UTS_MACHINE := $(ARCH) 257SRCARCH := $(ARCH) 258 259# Additional ARCH settings for x86 260ifeq ($(ARCH),i386) 261 SRCARCH := x86 262endif 263ifeq ($(ARCH),x86_64) 264 SRCARCH := x86 265endif 266 267# Additional ARCH settings for sparc 268ifeq ($(ARCH),sparc32) 269 SRCARCH := sparc 270endif 271ifeq ($(ARCH),sparc64) 272 SRCARCH := sparc 273endif 274 275# Additional ARCH settings for sh 276ifeq ($(ARCH),sh64) 277 SRCARCH := sh 278endif 279 280# Additional ARCH settings for tile 281ifeq ($(ARCH),tilepro) 282 SRCARCH := tile 283endif 284ifeq ($(ARCH),tilegx) 285 SRCARCH := tile 286endif 287 288# Where to locate arch specific headers 289hdr-arch := $(SRCARCH) 290 291KCONFIG_CONFIG ?= .config 292export KCONFIG_CONFIG 293 294# SHELL used by kbuild 295CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 296 else if [ -x /bin/bash ]; then echo /bin/bash; \ 297 else echo sh; fi ; fi) 298 299HOSTCC = gcc 300HOSTCXX = g++ 301HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 302HOSTCXXFLAGS = -O2 303 304ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 305HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 306 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 307endif 308 309# Decide whether to build built-in, modular, or both. 310# Normally, just do built-in. 311 312KBUILD_MODULES := 313KBUILD_BUILTIN := 1 314 315# If we have only "make modules", don't compile built-in objects. 316# When we're building modules with modversions, we need to consider 317# the built-in objects during the descend as well, in order to 318# make sure the checksums are up to date before we record them. 319 320ifeq ($(MAKECMDGOALS),modules) 321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 322endif 323 324# If we have "make <whatever> modules", compile modules 325# in addition to whatever we do anyway. 326# Just "make" or "make all" shall build modules as well 327 328ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 329 KBUILD_MODULES := 1 330endif 331 332ifeq ($(MAKECMDGOALS),) 333 KBUILD_MODULES := 1 334endif 335 336export KBUILD_MODULES KBUILD_BUILTIN 337export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 338 339ifneq ($(CC),) 340ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 341COMPILER := clang 342else 343COMPILER := gcc 344endif 345export COMPILER 346endif 347 348# We need some generic definitions (do not try to remake the file). 349scripts/Kbuild.include: ; 350include scripts/Kbuild.include 351 352# Make variables (CC, etc...) 353AS = $(CROSS_COMPILE)as 354LD = $(CROSS_COMPILE)ld 355CC = $(CROSS_COMPILE)gcc 356CPP = $(CC) -E 357AR = $(CROSS_COMPILE)ar 358NM = $(CROSS_COMPILE)nm 359STRIP = $(CROSS_COMPILE)strip 360OBJCOPY = $(CROSS_COMPILE)objcopy 361OBJDUMP = $(CROSS_COMPILE)objdump 362AWK = awk 363GENKSYMS = scripts/genksyms/genksyms 364INSTALLKERNEL := installkernel 365DEPMOD = /sbin/depmod 366PERL = perl 367PYTHON = python 368CHECK = sparse 369 370CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 371 -Wbitwise -Wno-return-void $(CF) 372CFLAGS_MODULE = 373AFLAGS_MODULE = 374LDFLAGS_MODULE = 375CFLAGS_KERNEL = 376AFLAGS_KERNEL = 377CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 378 379 380# Use USERINCLUDE when you must reference the UAPI directories only. 381USERINCLUDE := \ 382 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 383 -Iarch/$(hdr-arch)/include/generated/uapi \ 384 -I$(srctree)/include/uapi \ 385 -Iinclude/generated/uapi \ 386 -include $(srctree)/include/linux/kconfig.h 387 388# Use LINUXINCLUDE when you must reference the include/ directory. 389# Needed to be compatible with the O= option 390LINUXINCLUDE := \ 391 -I$(srctree)/arch/$(hdr-arch)/include \ 392 -Iarch/$(hdr-arch)/include/generated/uapi \ 393 -Iarch/$(hdr-arch)/include/generated \ 394 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 395 -Iinclude \ 396 $(USERINCLUDE) 397 398KBUILD_CPPFLAGS := -D__KERNEL__ 399 400KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 401 -fno-strict-aliasing -fno-common \ 402 -Werror-implicit-function-declaration \ 403 -Wno-format-security \ 404 -std=gnu89 405 406KBUILD_AFLAGS_KERNEL := 407KBUILD_CFLAGS_KERNEL := 408KBUILD_AFLAGS := -D__ASSEMBLY__ 409KBUILD_AFLAGS_MODULE := -DMODULE 410KBUILD_CFLAGS_MODULE := -DMODULE 411KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 412 413# Read KERNELRELEASE from include/config/kernel.release (if it exists) 414KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 415KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 416 417export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 418export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 419export CPP AR NM STRIP OBJCOPY OBJDUMP 420export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 421export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 422 423export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 424export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN 425export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 426export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 427export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 428export KBUILD_ARFLAGS 429 430# When compiling out-of-tree modules, put MODVERDIR in the module 431# tree rather than in the kernel tree. The kernel tree might 432# even be read-only. 433export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 434 435# Files to ignore in find ... statements 436 437export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 439 -prune -o 440export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 441 --exclude CVS --exclude .pc --exclude .hg --exclude .git 442 443# =========================================================================== 444# Rules shared between *config targets and build targets 445 446# Basic helpers built in scripts/ 447PHONY += scripts_basic 448scripts_basic: 449 $(Q)$(MAKE) $(build)=scripts/basic 450 $(Q)rm -f .tmp_quiet_recordmcount 451 452# To avoid any implicit rule to kick in, define an empty command. 453scripts/basic/%: scripts_basic ; 454 455PHONY += outputmakefile 456# outputmakefile generates a Makefile in the output directory, if using a 457# separate output directory. This allows convenient use of make in the 458# output directory. 459outputmakefile: 460ifneq ($(KBUILD_SRC),) 461 $(Q)ln -fsn $(srctree) source 462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 464endif 465 466# Support for using generic headers in asm-generic 467PHONY += asm-generic 468asm-generic: 469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 470 src=asm obj=arch/$(SRCARCH)/include/generated/asm 471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 473 474# To make sure we do not include .config for any of the *config targets 475# catch them early, and hand them over to scripts/kconfig/Makefile 476# It is allowed to specify more targets when calling make, including 477# mixing *config targets and build targets. 478# For example 'make oldconfig all'. 479# Detect when mixed targets is specified, and make a second invocation 480# of make so .config is not included in this case either (for *config). 481 482version_h := include/generated/uapi/linux/version.h 483old_version_h := include/linux/version.h 484 485no-dot-config-targets := clean mrproper distclean \ 486 cscope gtags TAGS tags help% %docs check% coccicheck \ 487 $(version_h) headers_% archheaders archscripts \ 488 kernelversion %src-pkg 489 490config-targets := 0 491mixed-targets := 0 492dot-config := 1 493 494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 496 dot-config := 0 497 endif 498endif 499 500ifeq ($(KBUILD_EXTMOD),) 501 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 502 config-targets := 1 503 ifneq ($(words $(MAKECMDGOALS)),1) 504 mixed-targets := 1 505 endif 506 endif 507endif 508 509ifeq ($(mixed-targets),1) 510# =========================================================================== 511# We're called with mixed targets (*config and build targets). 512# Handle them one by one. 513 514PHONY += $(MAKECMDGOALS) __build_one_by_one 515 516$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 517 @: 518 519__build_one_by_one: 520 $(Q)set -e; \ 521 for i in $(MAKECMDGOALS); do \ 522 $(MAKE) -f $(srctree)/Makefile $$i; \ 523 done 524 525else 526ifeq ($(config-targets),1) 527# =========================================================================== 528# *config targets only - make sure prerequisites are updated, and descend 529# in scripts/kconfig to make the *config target 530 531# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 532# KBUILD_DEFCONFIG may point out an alternative default configuration 533# used for 'make defconfig' 534include arch/$(SRCARCH)/Makefile 535export KBUILD_DEFCONFIG KBUILD_KCONFIG 536 537config: scripts_basic outputmakefile FORCE 538 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 539 540%config: scripts_basic outputmakefile FORCE 541 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 542 543else 544# =========================================================================== 545# Build targets only - this includes vmlinux, arch specific targets, clean 546# targets and others. In general all targets except *config targets. 547 548ifeq ($(KBUILD_EXTMOD),) 549# Additional helpers built in scripts/ 550# Carefully list dependencies so we do not try to build scripts twice 551# in parallel 552PHONY += scripts 553scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 554 asm-generic 555 $(Q)$(MAKE) $(build)=$(@) 556 557# Objects we will link into vmlinux / subdirs we need to visit 558init-y := init/ 559drivers-y := drivers/ sound/ firmware/ 560net-y := net/ 561libs-y := lib/ 562core-y := usr/ 563endif # KBUILD_EXTMOD 564 565ifeq ($(dot-config),1) 566# Read in config 567-include include/config/auto.conf 568 569ifeq ($(KBUILD_EXTMOD),) 570# Read in dependencies to all Kconfig* files, make sure to run 571# oldconfig if changes are detected. 572-include include/config/auto.conf.cmd 573 574# To avoid any implicit rule to kick in, define an empty command 575$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 576 577# If .config is newer than include/config/auto.conf, someone tinkered 578# with it and forgot to run make oldconfig. 579# if auto.conf.cmd is missing then we are probably in a cleaned tree so 580# we execute the config step to be sure to catch updated Kconfig files 581include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 582 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 583else 584# external modules needs include/generated/autoconf.h and include/config/auto.conf 585# but do not care if they are up-to-date. Use auto.conf to trigger the test 586PHONY += include/config/auto.conf 587 588include/config/auto.conf: 589 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 590 echo >&2; \ 591 echo >&2 " ERROR: Kernel configuration is invalid."; \ 592 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 593 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 594 echo >&2 ; \ 595 /bin/false) 596 597endif # KBUILD_EXTMOD 598 599else 600# Dummy target needed, because used as prerequisite 601include/config/auto.conf: ; 602endif # $(dot-config) 603 604# The all: target is the default when no target is given on the 605# command line. 606# This allow a user to issue only 'make' to build a kernel including modules 607# Defaults to vmlinux, but the arch makefile usually adds further targets 608all: vmlinux 609 610include arch/$(SRCARCH)/Makefile 611 612KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 613 614ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 615KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 616else 617KBUILD_CFLAGS += -O2 618endif 619 620# Tell gcc to never replace conditional load with a non-conditional one 621KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 622 623ifdef CONFIG_READABLE_ASM 624# Disable optimizations that make assembler listings hard to read. 625# reorder blocks reorders the control in the function 626# ipa clone creates specialized cloned functions 627# partial inlining inlines only parts of functions 628KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 629 $(call cc-option,-fno-ipa-cp-clone,) \ 630 $(call cc-option,-fno-partial-inlining) 631endif 632 633ifneq ($(CONFIG_FRAME_WARN),0) 634KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 635endif 636 637# Handle stack protector mode. 638# 639# Since kbuild can potentially perform two passes (first with the old 640# .config values and then with updated .config values), we cannot error out 641# if a desired compiler option is unsupported. If we were to error, kbuild 642# could never get to the second pass and actually notice that we changed 643# the option to something that was supported. 644# 645# Additionally, we don't want to fallback and/or silently change which compiler 646# flags will be used, since that leads to producing kernels with different 647# security feature characteristics depending on the compiler used. ("But I 648# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 649# 650# The middle ground is to warn here so that the failed option is obvious, but 651# to let the build fail with bad compiler flags so that we can't produce a 652# kernel when there is a CONFIG and compiler mismatch. 653# 654ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 655 stackp-flag := -fstack-protector 656 ifeq ($(call cc-option, $(stackp-flag)),) 657 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 658 -fstack-protector not supported by compiler) 659 endif 660else 661ifdef CONFIG_CC_STACKPROTECTOR_STRONG 662 stackp-flag := -fstack-protector-strong 663 ifeq ($(call cc-option, $(stackp-flag)),) 664 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 665 -fstack-protector-strong not supported by compiler) 666 endif 667else 668 # Force off for distro compilers that enable stack protector by default. 669 stackp-flag := $(call cc-option, -fno-stack-protector) 670endif 671endif 672KBUILD_CFLAGS += $(stackp-flag) 673 674ifeq ($(COMPILER),clang) 675KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 676KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 677KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 678KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 679KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 680# Quiet clang warning: comparison of unsigned expression < 0 is always false 681KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 682# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 683# source of a reference will be _MergedGlobals and not on of the whitelisted names. 684# See modpost pattern 2 685KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 686KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 687else 688 689# This warning generated too much noise in a regular build. 690# Use make W=1 to enable this warning (see scripts/Makefile.build) 691KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 692endif 693 694ifdef CONFIG_FRAME_POINTER 695KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 696else 697# Some targets (ARM with Thumb2, for example), can't be built with frame 698# pointers. For those, we don't have FUNCTION_TRACER automatically 699# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 700# incompatible with -fomit-frame-pointer with current GCC, so we don't use 701# -fomit-frame-pointer with FUNCTION_TRACER. 702ifndef CONFIG_FUNCTION_TRACER 703KBUILD_CFLAGS += -fomit-frame-pointer 704endif 705endif 706 707KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 708 709ifdef CONFIG_DEBUG_INFO 710ifdef CONFIG_DEBUG_INFO_SPLIT 711KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 712else 713KBUILD_CFLAGS += -g 714endif 715KBUILD_AFLAGS += -Wa,-gdwarf-2 716endif 717ifdef CONFIG_DEBUG_INFO_DWARF4 718KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 719endif 720 721ifdef CONFIG_DEBUG_INFO_REDUCED 722KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 723 $(call cc-option,-fno-var-tracking) 724endif 725 726ifdef CONFIG_FUNCTION_TRACER 727ifndef CC_FLAGS_FTRACE 728CC_FLAGS_FTRACE := -pg 729endif 730export CC_FLAGS_FTRACE 731ifdef CONFIG_HAVE_FENTRY 732CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 733endif 734KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 735KBUILD_AFLAGS += $(CC_USING_FENTRY) 736ifdef CONFIG_DYNAMIC_FTRACE 737 ifdef CONFIG_HAVE_C_RECORDMCOUNT 738 BUILD_C_RECORDMCOUNT := y 739 export BUILD_C_RECORDMCOUNT 740 endif 741endif 742endif 743 744# We trigger additional mismatches with less inlining 745ifdef CONFIG_DEBUG_SECTION_MISMATCH 746KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 747endif 748 749# arch Makefile may override CC so keep this after arch Makefile is included 750NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 751CHECKFLAGS += $(NOSTDINC_FLAGS) 752 753# warn about C99 declaration after statement 754KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 755 756# disable pointer signed / unsigned warnings in gcc 4.0 757KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 758 759# disable invalid "can't wrap" optimizations for signed / pointers 760KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 761 762# conserve stack if available 763KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 764 765# disallow errors like 'EXPORT_GPL(foo);' with missing header 766KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 767 768# require functions to have arguments in prototypes, not empty 'int foo()' 769KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 770 771# Prohibit date/time macros, which would make the build non-deterministic 772KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 773 774# use the deterministic mode of AR if available 775KBUILD_ARFLAGS := $(call ar-option,D) 776 777# check for 'asm goto' 778ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 779 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 780 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 781endif 782 783include scripts/Makefile.kasan 784include scripts/Makefile.extrawarn 785 786# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 787KBUILD_CPPFLAGS += $(KCPPFLAGS) 788KBUILD_AFLAGS += $(KAFLAGS) 789KBUILD_CFLAGS += $(KCFLAGS) 790 791# Use --build-id when available. 792LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 793 $(call cc-ldoption, -Wl$(comma)--build-id,)) 794KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 795LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 796 797ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 798LDFLAGS_vmlinux += $(call ld-option, -X,) 799endif 800 801# Default kernel image to build when no specific target is given. 802# KBUILD_IMAGE may be overruled on the command line or 803# set in the environment 804# Also any assignments in arch/$(ARCH)/Makefile take precedence over 805# this default value 806export KBUILD_IMAGE ?= vmlinux 807 808# 809# INSTALL_PATH specifies where to place the updated kernel and system map 810# images. Default is /boot, but you can set it to other values 811export INSTALL_PATH ?= /boot 812 813# 814# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 815# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 816# an argument if needed. Otherwise it defaults to the kernel install path 817# 818export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 819 820# 821# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 822# relocations required by build roots. This is not defined in the 823# makefile but the argument can be passed to make if needed. 824# 825 826MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 827export MODLIB 828 829# 830# INSTALL_MOD_STRIP, if defined, will cause modules to be 831# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 832# the default option --strip-debug will be used. Otherwise, 833# INSTALL_MOD_STRIP value will be used as the options to the strip command. 834 835ifdef INSTALL_MOD_STRIP 836ifeq ($(INSTALL_MOD_STRIP),1) 837mod_strip_cmd = $(STRIP) --strip-debug 838else 839mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 840endif # INSTALL_MOD_STRIP=1 841else 842mod_strip_cmd = true 843endif # INSTALL_MOD_STRIP 844export mod_strip_cmd 845 846# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 847# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 848# or CONFIG_MODULE_COMPRESS_XZ. 849 850mod_compress_cmd = true 851ifdef CONFIG_MODULE_COMPRESS 852 ifdef CONFIG_MODULE_COMPRESS_GZIP 853 mod_compress_cmd = gzip -n 854 endif # CONFIG_MODULE_COMPRESS_GZIP 855 ifdef CONFIG_MODULE_COMPRESS_XZ 856 mod_compress_cmd = xz 857 endif # CONFIG_MODULE_COMPRESS_XZ 858endif # CONFIG_MODULE_COMPRESS 859export mod_compress_cmd 860 861# Select initial ramdisk compression format, default is gzip(1). 862# This shall be used by the dracut(8) tool while creating an initramfs image. 863# 864INITRD_COMPRESS-y := gzip 865INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 866INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 867INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 868INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 869INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 870# do not export INITRD_COMPRESS, since we didn't actually 871# choose a sane default compression above. 872# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 873 874ifdef CONFIG_MODULE_SIG_ALL 875MODSECKEY = ./signing_key.priv 876MODPUBKEY = ./signing_key.x509 877export MODPUBKEY 878mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 879else 880mod_sign_cmd = true 881endif 882export mod_sign_cmd 883 884 885ifeq ($(KBUILD_EXTMOD),) 886core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 887 888vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 889 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 890 $(net-y) $(net-m) $(libs-y) $(libs-m))) 891 892vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 893 $(init-) $(core-) $(drivers-) $(net-) $(libs-)))) 894 895init-y := $(patsubst %/, %/built-in.o, $(init-y)) 896core-y := $(patsubst %/, %/built-in.o, $(core-y)) 897drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 898net-y := $(patsubst %/, %/built-in.o, $(net-y)) 899libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 900libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 901libs-y := $(libs-y1) $(libs-y2) 902 903# Externally visible symbols (used by link-vmlinux.sh) 904export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 905export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 906export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 907export LDFLAGS_vmlinux 908# used by scripts/pacmage/Makefile 909export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 910 911vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 912 913# Final link of vmlinux 914 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 915quiet_cmd_link-vmlinux = LINK $@ 916 917# Include targets which we want to 918# execute if the rest of the kernel build went well. 919vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 920ifdef CONFIG_HEADERS_CHECK 921 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 922endif 923ifdef CONFIG_SAMPLES 924 $(Q)$(MAKE) $(build)=samples 925endif 926ifdef CONFIG_BUILD_DOCSRC 927 $(Q)$(MAKE) $(build)=Documentation 928endif 929ifdef CONFIG_GDB_SCRIPTS 930 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 931endif 932 +$(call if_changed,link-vmlinux) 933 934# The actual objects are generated when descending, 935# make sure no implicit rule kicks in 936$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 937 938# Handle descending into subdirectories listed in $(vmlinux-dirs) 939# Preset locale variables to speed up the build process. Limit locale 940# tweaks to this spot to avoid wrong language settings when running 941# make menuconfig etc. 942# Error messages still appears in the original language 943 944PHONY += $(vmlinux-dirs) 945$(vmlinux-dirs): prepare scripts 946 $(Q)$(MAKE) $(build)=$@ 947 948define filechk_kernel.release 949 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 950endef 951 952# Store (new) KERNELRELEASE string in include/config/kernel.release 953include/config/kernel.release: include/config/auto.conf FORCE 954 $(call filechk,kernel.release) 955 956 957# Things we need to do before we recursively start building the kernel 958# or the modules are listed in "prepare". 959# A multi level approach is used. prepareN is processed before prepareN-1. 960# archprepare is used in arch Makefiles and when processed asm symlink, 961# version.h and scripts_basic is processed / created. 962 963# Listed in dependency order 964PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 965 966# prepare3 is used to check if we are building in a separate output directory, 967# and if so do: 968# 1) Check that make has not been executed in the kernel src $(srctree) 969prepare3: include/config/kernel.release 970ifneq ($(KBUILD_SRC),) 971 @$(kecho) ' Using $(srctree) as source for kernel' 972 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 973 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 974 echo >&2 " in the '$(srctree)' directory.";\ 975 /bin/false; \ 976 fi; 977endif 978 979# prepare2 creates a makefile if using a separate output directory 980prepare2: prepare3 outputmakefile asm-generic 981 982prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 983 include/config/auto.conf 984 $(cmd_crmodverdir) 985 986archprepare: archheaders archscripts prepare1 scripts_basic 987 988prepare0: archprepare FORCE 989 $(Q)$(MAKE) $(build)=. 990 991# All the preparing.. 992prepare: prepare0 993 994# Generate some files 995# --------------------------------------------------------------------------- 996 997# KERNELRELEASE can change from a few different places, meaning version.h 998# needs to be updated, so this check is forced on all builds 999 1000uts_len := 64
1001define filechk_utsrelease.h 1002 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1003 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1004 exit 1; \ 1005 fi; \ 1006 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1007endef 1008 1009define filechk_version.h 1010 (echo \#define LINUX_VERSION_CODE $(shell \ 1011 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1012 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1013endef 1014 1015$(version_h): $(srctree)/Makefile FORCE 1016 $(call filechk,version.h) 1017 $(Q)rm -f $(old_version_h) 1018 1019include/generated/utsrelease.h: include/config/kernel.release FORCE 1020 $(call filechk,utsrelease.h) 1021 1022PHONY += headerdep 1023headerdep: 1024 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1025 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1026 1027# --------------------------------------------------------------------------- 1028# Firmware install 1029INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1030export INSTALL_FW_PATH 1031 1032PHONY += firmware_install 1033firmware_install: FORCE 1034 @mkdir -p $(objtree)/firmware 1035 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1036 1037# --------------------------------------------------------------------------- 1038# Kernel headers 1039 1040#Default location for installed headers 1041export INSTALL_HDR_PATH = $(objtree)/usr 1042 1043# If we do an all arch process set dst to asm-$(hdr-arch) 1044hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1045 1046PHONY += archheaders 1047archheaders: 1048 1049PHONY += archscripts 1050archscripts: 1051 1052PHONY += __headers 1053__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1054 $(Q)$(MAKE) $(build)=scripts build_unifdef 1055 1056PHONY += headers_install_all 1057headers_install_all: 1058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1059 1060PHONY += headers_install 1061headers_install: __headers 1062 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1063 $(error Headers not exportable for the $(SRCARCH) architecture)) 1064 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1065 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1066 1067PHONY += headers_check_all 1068headers_check_all: headers_install_all 1069 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1070 1071PHONY += headers_check 1072headers_check: headers_install 1073 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1074 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1075 1076# --------------------------------------------------------------------------- 1077# Kernel selftest 1078 1079PHONY += kselftest 1080kselftest: 1081 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1082 1083# --------------------------------------------------------------------------- 1084# Modules 1085 1086ifdef CONFIG_MODULES 1087 1088# By default, build modules as well 1089 1090all: modules 1091 1092# Build modules 1093# 1094# A module can be listed more than once in obj-m resulting in 1095# duplicate lines in modules.order files. Those are removed 1096# using awk while concatenating to the final file. 1097 1098PHONY += modules 1099modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1100 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1101 @$(kecho) ' Building modules, stage 2.'; 1102 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1103 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1104 1105modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1106 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1107 1108%/modules.builtin: include/config/auto.conf 1109 $(Q)$(MAKE) $(modbuiltin)=$* 1110 1111 1112# Target to prepare building external modules 1113PHONY += modules_prepare 1114modules_prepare: prepare scripts 1115 1116# Target to install modules 1117PHONY += modules_install 1118modules_install: _modinst_ _modinst_post 1119 1120PHONY += _modinst_ 1121_modinst_: 1122 @rm -rf $(MODLIB)/kernel 1123 @rm -f $(MODLIB)/source 1124 @mkdir -p $(MODLIB)/kernel 1125 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1126 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1127 rm -f $(MODLIB)/build ; \ 1128 ln -s $(CURDIR) $(MODLIB)/build ; \ 1129 fi 1130 @cp -f $(objtree)/modules.order $(MODLIB)/ 1131 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1132 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1133 1134# This depmod is only for convenience to give the initial 1135# boot a modules.dep even before / is mounted read-write. However the 1136# boot script depmod is the master version. 1137PHONY += _modinst_post 1138_modinst_post: _modinst_ 1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1140 $(call cmd,depmod) 1141 1142ifeq ($(CONFIG_MODULE_SIG), y) 1143PHONY += modules_sign 1144modules_sign: 1145 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1146endif 1147 1148else # CONFIG_MODULES 1149 1150# Modules not configured 1151# --------------------------------------------------------------------------- 1152 1153modules modules_install: FORCE 1154 @echo >&2 1155 @echo >&2 "The present kernel configuration has modules disabled." 1156 @echo >&2 "Type 'make config' and enable loadable module support." 1157 @echo >&2 "Then build a kernel with module support enabled." 1158 @echo >&2 1159 @exit 1 1160 1161endif # CONFIG_MODULES 1162 1163### 1164# Cleaning is done on three levels. 1165# make clean Delete most generated files 1166# Leave enough to build external modules 1167# make mrproper Delete the current configuration, and all generated files 1168# make distclean Remove editor backup files, patch leftover files and the like 1169 1170# Directories & files removed with 'make clean' 1171CLEAN_DIRS += $(MODVERDIR) 1172 1173# Directories & files removed with 'make mrproper' 1174MRPROPER_DIRS += include/config usr/include include/generated \ 1175 arch/*/include/generated .tmp_objdiff 1176MRPROPER_FILES += .config .config.old .version .old_version \ 1177 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1178 signing_key.priv signing_key.x509 x509.genkey \ 1179 extra_certificates signing_key.x509.keyid \ 1180 signing_key.x509.signer vmlinux-gdb.py 1181 1182# clean - Delete most, but leave enough to build external modules 1183# 1184clean: rm-dirs := $(CLEAN_DIRS) 1185clean: rm-files := $(CLEAN_FILES) 1186clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1187 1188PHONY += $(clean-dirs) clean archclean vmlinuxclean 1189$(clean-dirs): 1190 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1191 1192vmlinuxclean: 1193 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1194 1195clean: archclean vmlinuxclean 1196 1197# mrproper - Delete all generated files, including .config 1198# 1199mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1200mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1201mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1202 1203PHONY += $(mrproper-dirs) mrproper archmrproper 1204$(mrproper-dirs): 1205 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1206 1207mrproper: clean archmrproper $(mrproper-dirs) 1208 $(call cmd,rmdirs) 1209 $(call cmd,rmfiles) 1210 1211# distclean 1212# 1213PHONY += distclean 1214 1215distclean: mrproper 1216 @find $(srctree) $(RCS_FIND_IGNORE) \ 1217 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1218 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1219 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1220 -type f -print | xargs rm -f 1221 1222 1223# Packaging of the kernel to various formats 1224# --------------------------------------------------------------------------- 1225# rpm target kept for backward compatibility 1226package-dir := scripts/package 1227 1228%src-pkg: FORCE 1229 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1230%pkg: include/config/kernel.release FORCE 1231 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1232rpm: include/config/kernel.release FORCE 1233 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1234 1235 1236# Brief documentation of the typical targets used 1237# --------------------------------------------------------------------------- 1238 1239boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1240boards := $(sort $(notdir $(boards))) 1241board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1242board-dirs := $(sort $(notdir $(board-dirs:/=))) 1243 1244help: 1245 @echo 'Cleaning targets:' 1246 @echo ' clean - Remove most generated files but keep the config and' 1247 @echo ' enough build support to build external modules' 1248 @echo ' mrproper - Remove all generated files + config + various backup files' 1249 @echo ' distclean - mrproper + remove editor backup and patch files' 1250 @echo '' 1251 @echo 'Configuration targets:' 1252 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1253 @echo '' 1254 @echo 'Other generic targets:' 1255 @echo ' all - Build all targets marked with [*]' 1256 @echo '* vmlinux - Build the bare kernel' 1257 @echo '* modules - Build all modules' 1258 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1259 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1260 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1261 @echo ' dir/ - Build all files in dir and below' 1262 @echo ' dir/file.[oisS] - Build specified target only' 1263 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1264 @echo ' (requires a recent binutils and recent build (System.map))' 1265 @echo ' dir/file.ko - Build module including final link' 1266 @echo ' modules_prepare - Set up for building external modules' 1267 @echo ' tags/TAGS - Generate tags file for editors' 1268 @echo ' cscope - Generate cscope index' 1269 @echo ' gtags - Generate GNU GLOBAL index' 1270 @echo ' kernelrelease - Output the release version string (use with make -s)' 1271 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1272 @echo ' image_name - Output the image name (use with make -s)' 1273 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1274 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1275 echo '' 1276 @echo 'Static analysers' 1277 @echo ' checkstack - Generate a list of stack hogs' 1278 @echo ' namespacecheck - Name space analysis on compiled kernel' 1279 @echo ' versioncheck - Sanity check on version.h usage' 1280 @echo ' includecheck - Check for duplicate included header files' 1281 @echo ' export_report - List the usages of all exported symbols' 1282 @echo ' headers_check - Sanity check on exported headers' 1283 @echo ' headerdep - Detect inclusion cycles in headers' 1284 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1285 @echo '' 1286 @echo 'Kernel selftest' 1287 @echo ' kselftest - Build and run kernel selftest (run as root)' 1288 @echo ' Build, install, and boot kernel before' 1289 @echo ' running kselftest on it' 1290 @echo '' 1291 @echo 'Kernel packaging:' 1292 @$(MAKE) $(build)=$(package-dir) help 1293 @echo '' 1294 @echo 'Documentation targets:' 1295 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1296 @echo '' 1297 @echo 'Architecture specific targets ($(SRCARCH)):' 1298 @$(if $(archhelp),$(archhelp),\ 1299 echo ' No architecture specific help defined for $(SRCARCH)') 1300 @echo '' 1301 @$(if $(boards), \ 1302 $(foreach b, $(boards), \ 1303 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1304 echo '') 1305 @$(if $(board-dirs), \ 1306 $(foreach b, $(board-dirs), \ 1307 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1308 printf " %-16s - Show all of the above\\n" help-boards; \ 1309 echo '') 1310 1311 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1312 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1313 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1314 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1315 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1316 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1317 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1318 @echo ' 1: warnings which may be relevant and do not occur too often' 1319 @echo ' 2: warnings which occur quite often but may still be relevant' 1320 @echo ' 3: more obscure warnings, can most likely be ignored' 1321 @echo ' Multiple levels can be combined with W=12 or W=123' 1322 @echo '' 1323 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1324 @echo 'For further info see the ./README file' 1325 1326 1327help-board-dirs := $(addprefix help-,$(board-dirs)) 1328 1329help-boards: $(help-board-dirs) 1330 1331boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1332 1333$(help-board-dirs): help-%: 1334 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1335 @$(if $(boards-per-dir), \ 1336 $(foreach b, $(boards-per-dir), \ 1337 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1338 echo '') 1339 1340 1341# Documentation targets 1342# --------------------------------------------------------------------------- 1343%docs: scripts_basic FORCE 1344 $(Q)$(MAKE) $(build)=scripts build_docproc 1345 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1346 1347else # KBUILD_EXTMOD 1348 1349### 1350# External module support. 1351# When building external modules the kernel used as basis is considered 1352# read-only, and no consistency checks are made and the make 1353# system is not used on the basis kernel. If updates are required 1354# in the basis kernel ordinary make commands (without M=...) must 1355# be used. 1356# 1357# The following are the only valid targets when building external 1358# modules. 1359# make M=dir clean Delete all automatically generated files 1360# make M=dir modules Make all modules in specified dir 1361# make M=dir Same as 'make M=dir modules' 1362# make M=dir modules_install 1363# Install the modules built in the module directory 1364# Assumes install directory is already created 1365 1366# We are always building modules 1367KBUILD_MODULES := 1 1368PHONY += crmodverdir 1369crmodverdir: 1370 $(cmd_crmodverdir) 1371 1372PHONY += $(objtree)/Module.symvers 1373$(objtree)/Module.symvers: 1374 @test -e $(objtree)/Module.symvers || ( \ 1375 echo; \ 1376 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1377 echo " is missing; modules will have no dependencies and modversions."; \ 1378 echo ) 1379 1380module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1381PHONY += $(module-dirs) modules 1382$(module-dirs): crmodverdir $(objtree)/Module.symvers 1383 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1384 1385modules: $(module-dirs) 1386 @$(kecho) ' Building modules, stage 2.'; 1387 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1388 1389PHONY += modules_install 1390modules_install: _emodinst_ _emodinst_post 1391 1392install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1393PHONY += _emodinst_ 1394_emodinst_: 1395 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1396 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1397 1398PHONY += _emodinst_post 1399_emodinst_post: _emodinst_ 1400 $(call cmd,depmod) 1401 1402clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1403 1404PHONY += $(clean-dirs) clean 1405$(clean-dirs): 1406 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1407 1408clean: rm-dirs := $(MODVERDIR) 1409clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1410 1411help: 1412 @echo ' Building external modules.' 1413 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1414 @echo '' 1415 @echo ' modules - default target, build the module(s)' 1416 @echo ' modules_install - install the module' 1417 @echo ' clean - remove generated files in module directory only' 1418 @echo '' 1419 1420# Dummies... 1421PHONY += prepare scripts 1422prepare: ; 1423scripts: ; 1424endif # KBUILD_EXTMOD 1425 1426clean: $(clean-dirs) 1427 $(call cmd,rmdirs) 1428 $(call cmd,rmfiles) 1429 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1430 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1431 -o -name '*.ko.*' \ 1432 -o -name '*.dwo' \ 1433 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1434 -o -name '*.symtypes' -o -name 'modules.order' \ 1435 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1436 -o -name '*.gcno' \) -type f -print | xargs rm -f 1437 1438# Generate tags for editors 1439# --------------------------------------------------------------------------- 1440quiet_cmd_tags = GEN $@ 1441 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1442 1443tags TAGS cscope gtags: FORCE 1444 $(call cmd,tags) 1445 1446# Scripts to check various things for consistency 1447# --------------------------------------------------------------------------- 1448 1449PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1450 1451includecheck: 1452 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1453 -name '*.[hcS]' -type f -print | sort \ 1454 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1455 1456versioncheck: 1457 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1458 -name '*.[hcS]' -type f -print | sort \ 1459 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1460 1461coccicheck: 1462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1463 1464namespacecheck: 1465 $(PERL) $(srctree)/scripts/namespace.pl 1466 1467export_report: 1468 $(PERL) $(srctree)/scripts/export_report.pl 1469 1470endif #ifeq ($(config-targets),1) 1471endif #ifeq ($(mixed-targets),1) 1472 1473PHONY += checkstack kernelrelease kernelversion image_name 1474 1475# UML needs a little special treatment here. It wants to use the host 1476# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1477# else wants $(ARCH), including people doing cross-builds, which means 1478# that $(SUBARCH) doesn't work here. 1479ifeq ($(ARCH), um) 1480CHECKSTACK_ARCH := $(SUBARCH) 1481else 1482CHECKSTACK_ARCH := $(ARCH) 1483endif 1484checkstack: 1485 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1486 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1487 1488kernelrelease: 1489 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1490 1491kernelversion: 1492 @echo $(KERNELVERSION) 1493 1494image_name: 1495 @echo $(KBUILD_IMAGE) 1496 1497# Clear a bunch of variables before executing the submake 1498tools/: FORCE 1499 $(Q)mkdir -p $(objtree)/tools 1500 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1501 1502tools/%: FORCE 1503 $(Q)mkdir -p $(objtree)/tools 1504 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1505 1506# Single targets 1507# --------------------------------------------------------------------------- 1508# Single targets are compatible with: 1509# - build with mixed source and output 1510# - build with separate output dir 'make O=...' 1511# - external modules 1512# 1513# target-dir => where to store outputfile 1514# build-dir => directory in kernel source tree to use 1515 1516ifeq ($(KBUILD_EXTMOD),) 1517 build-dir = $(patsubst %/,%,$(dir $@)) 1518 target-dir = $(dir $@) 1519else 1520 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1521 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1522 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1523endif 1524 1525%.s: %.c prepare scripts FORCE 1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1527%.i: %.c prepare scripts FORCE 1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1529%.o: %.c prepare scripts FORCE 1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1531%.lst: %.c prepare scripts FORCE 1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1533%.s: %.S prepare scripts FORCE 1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1535%.o: %.S prepare scripts FORCE 1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1537%.symtypes: %.c prepare scripts FORCE 1538 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1539 1540# Modules 1541/: prepare scripts FORCE 1542 $(cmd_crmodverdir) 1543 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1544 $(build)=$(build-dir) 1545# Make sure the latest headers are built for Documentation 1546Documentation/: headers_install 1547%/: prepare scripts FORCE 1548 $(cmd_crmodverdir) 1549 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1550 $(build)=$(build-dir) 1551%.ko: prepare scripts FORCE 1552 $(cmd_crmodverdir) 1553 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1554 $(build)=$(build-dir) $(@:.ko=.o) 1555 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1556 1557# FIXME Should go into a make.lib or something 1558# =========================================================================== 1559 1560quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1561 cmd_rmdirs = rm -rf $(rm-dirs) 1562 1563quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1564 cmd_rmfiles = rm -f $(rm-files) 1565 1566# Run depmod only if we have System.map and depmod is executable 1567quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1568 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1569 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1570 1571# Create temporary dir for module support files 1572# clean it up only when building all modules 1573cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1574 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1575 1576# read all saved command lines 1577 1578targets := $(wildcard $(sort $(targets))) 1579cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1580 1581ifneq ($(cmd_files),) 1582 $(cmd_files): ; # Do not try to update included dependency files 1583 include $(cmd_files) 1584endif 1585 1586endif # skip-makefile 1587 1588PHONY += FORCE 1589FORCE: 1590 1591# Declare the contents of the .PHONY variable as phony. We keep that 1592# information in a variable so we can use it in if_changed and friends. 1593.PHONY: $(PHONY) 1594