1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 8 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Kleptomaniac Octopus 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(KBUILD_OUTPUT),) 129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130# expand a shell special character '~'. We use a somewhat tedious way here. 131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132$(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135# $(realpath ...) resolves symlinks 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183# Invoke a second make in the output directory, passing relevant variables 184__sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(need-sub-make),) 192 193# Do not print "Entering directory ...", 194# but we want to display it when entering to the output directory 195# so that IDEs/editors are able to understand relative filenames. 196MAKEFLAGS += --no-print-directory 197 198# Call a source code checker (by default, "sparse") as part of the 199# C compilation. 200# 201# Use 'make C=1' to enable checking of only re-compiled files. 202# Use 'make C=2' to enable checking of *all* source files, regardless 203# of whether they are re-compiled or not. 204# 205# See the file "Documentation/dev-tools/sparse.rst" for more details, 206# including where to get the "sparse" utility. 207 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268no-sync-config-targets := $(no-dot-config-targets) install %install \ 269 kernelrelease 270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 271 272config-build := 273mixed-build := 274need-config := 1 275may-sync-config := 1 276single-build := 277 278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 280 need-config := 281 endif 282endif 283 284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 286 may-sync-config := 287 endif 288endif 289 290ifneq ($(KBUILD_EXTMOD),) 291 may-sync-config := 292endif 293 294ifeq ($(KBUILD_EXTMOD),) 295 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 296 config-build := 1 297 ifneq ($(words $(MAKECMDGOALS)),1) 298 mixed-build := 1 299 endif 300 endif 301endif 302 303# We cannot build single targets and the others at the same time 304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 305 single-build := 1 306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 307 mixed-build := 1 308 endif 309endif 310 311# For "make -j clean all", "make -j mrproper defconfig all", etc. 312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 314 mixed-build := 1 315 endif 316endif 317 318# install and modules_install need also be processed one by one 319ifneq ($(filter install,$(MAKECMDGOALS)),) 320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325ifdef mixed-build 326# =========================================================================== 327# We're called with mixed targets (*config and build targets). 328# Handle them one by one. 329 330PHONY += $(MAKECMDGOALS) __build_one_by_one 331 332$(MAKECMDGOALS): __build_one_by_one 333 @: 334 335__build_one_by_one: 336 $(Q)set -e; \ 337 for i in $(MAKECMDGOALS); do \ 338 $(MAKE) -f $(srctree)/Makefile $$i; \ 339 done 340 341else # !mixed-build 342 343include scripts/Kbuild.include 344 345# Read KERNELRELEASE from include/config/kernel.release (if it exists) 346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 349 350include scripts/subarch.include 351 352# Cross compiling and selecting different set of gcc/bin-utils 353# --------------------------------------------------------------------------- 354# 355# When performing cross compilation for other architectures ARCH shall be set 356# to the target architecture. (See arch/* for the possibilities). 357# ARCH can be set during invocation of make: 358# make ARCH=ia64 359# Another way is to have ARCH set in the environment. 360# The default ARCH is the host where make is executed. 361 362# CROSS_COMPILE specify the prefix used for all executables used 363# during compilation. Only gcc and related bin-utils executables 364# are prefixed with $(CROSS_COMPILE). 365# CROSS_COMPILE can be set on the command line 366# make CROSS_COMPILE=ia64-linux- 367# Alternatively CROSS_COMPILE can be set in the environment. 368# Default value for CROSS_COMPILE is not to prefix executables 369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 370ARCH ?= $(SUBARCH) 371 372# Architecture as present in compile.h 373UTS_MACHINE := $(ARCH) 374SRCARCH := $(ARCH) 375 376# Additional ARCH settings for x86 377ifeq ($(ARCH),i386) 378 SRCARCH := x86 379endif 380ifeq ($(ARCH),x86_64) 381 SRCARCH := x86 382endif 383 384# Additional ARCH settings for sparc 385ifeq ($(ARCH),sparc32) 386 SRCARCH := sparc 387endif 388ifeq ($(ARCH),sparc64) 389 SRCARCH := sparc 390endif 391 392# Additional ARCH settings for sh 393ifeq ($(ARCH),sh64) 394 SRCARCH := sh 395endif 396 397KCONFIG_CONFIG ?= .config 398export KCONFIG_CONFIG 399 400# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 401export KBUILD_DEFCONFIG := defconfig 402 403# SHELL used by kbuild 404CONFIG_SHELL := sh 405 406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 409 410ifneq ($(LLVM),) 411HOSTCC = clang 412HOSTCXX = clang++ 413else 414HOSTCC = gcc 415HOSTCXX = g++ 416endif 417 418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 419 -O2 -fomit-frame-pointer -std=gnu89 420export KBUILD_USERLDFLAGS := 421 422KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 424KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 425KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 426 427# Make variables (CC, etc...) 428CPP = $(CC) -E 429ifneq ($(LLVM),) 430CC = clang 431LD = ld.lld 432AR = llvm-ar 433NM = llvm-nm 434OBJCOPY = llvm-objcopy 435OBJDUMP = llvm-objdump 436READELF = llvm-readelf 437OBJSIZE = llvm-size 438STRIP = llvm-strip 439else 440CC = $(CROSS_COMPILE)gcc 441LD = $(CROSS_COMPILE)ld 442AR = $(CROSS_COMPILE)ar 443NM = $(CROSS_COMPILE)nm 444OBJCOPY = $(CROSS_COMPILE)objcopy 445OBJDUMP = $(CROSS_COMPILE)objdump 446READELF = $(CROSS_COMPILE)readelf 447OBJSIZE = $(CROSS_COMPILE)size 448STRIP = $(CROSS_COMPILE)strip 449endif 450PAHOLE = pahole 451LEX = flex 452YACC = bison 453AWK = awk 454INSTALLKERNEL := installkernel 455DEPMOD = /sbin/depmod 456PERL = perl 457PYTHON = python 458PYTHON3 = python3 459CHECK = sparse 460BASH = bash 461KGZIP = gzip 462KBZIP2 = bzip2 463KLZOP = lzop 464LZMA = lzma 465LZ4 = lz4c 466XZ = xz 467 468CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 469 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 470NOSTDINC_FLAGS := 471CFLAGS_MODULE = 472AFLAGS_MODULE = 473LDFLAGS_MODULE = 474CFLAGS_KERNEL = 475AFLAGS_KERNEL = 476LDFLAGS_vmlinux = 477 478# Use USERINCLUDE when you must reference the UAPI directories only. 479USERINCLUDE := \ 480 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 481 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 482 -I$(srctree)/include/uapi \ 483 -I$(objtree)/include/generated/uapi \ 484 -include $(srctree)/include/linux/kconfig.h 485 486# Use LINUXINCLUDE when you must reference the include/ directory. 487# Needed to be compatible with the O= option 488LINUXINCLUDE := \ 489 -I$(srctree)/arch/$(SRCARCH)/include \ 490 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 491 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 492 -I$(objtree)/include \ 493 $(USERINCLUDE) 494 495KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 496KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 497 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 498 -Werror=implicit-function-declaration -Werror=implicit-int \ 499 -Wno-format-security \ 500 -std=gnu89 501KBUILD_CPPFLAGS := -D__KERNEL__ 502KBUILD_AFLAGS_KERNEL := 503KBUILD_CFLAGS_KERNEL := 504KBUILD_AFLAGS_MODULE := -DMODULE 505KBUILD_CFLAGS_MODULE := -DMODULE 506KBUILD_LDFLAGS_MODULE := 507export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 508KBUILD_LDFLAGS := 509GCC_PLUGINS_CFLAGS := 510CLANG_FLAGS := 511 512export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 513export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL 514export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 515export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ 516export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 517 518export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 519export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 520export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN 521export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 522export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 523export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 524 525# Files to ignore in find ... statements 526 527export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 528 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 529 -prune -o 530export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 531 --exclude CVS --exclude .pc --exclude .hg --exclude .git 532 533# =========================================================================== 534# Rules shared between *config targets and build targets 535 536# Basic helpers built in scripts/basic/ 537PHONY += scripts_basic 538scripts_basic: 539 $(Q)$(MAKE) $(build)=scripts/basic 540 $(Q)rm -f .tmp_quiet_recordmcount 541 542PHONY += outputmakefile 543# Before starting out-of-tree build, make sure the source tree is clean. 544# outputmakefile generates a Makefile in the output directory, if using a 545# separate output directory. This allows convenient use of make in the 546# output directory. 547# At the same time when output Makefile generated, generate .gitignore to 548# ignore whole output directory 549outputmakefile: 550ifdef building_out_of_srctree 551 $(Q)if [ -f $(srctree)/.config -o \ 552 -d $(srctree)/include/config -o \ 553 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 554 echo >&2 "***"; \ 555 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 556 echo >&2 "*** in $(abs_srctree)";\ 557 echo >&2 "***"; \ 558 false; \ 559 fi 560 $(Q)ln -fsn $(srctree) source 561 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 562 $(Q)test -e .gitignore || \ 563 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 564endif 565 566ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 567ifneq ($(CROSS_COMPILE),) 568CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 569GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 570CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 571GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 572endif 573ifneq ($(GCC_TOOLCHAIN),) 574CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 575endif 576ifneq ($(LLVM_IAS),1) 577CLANG_FLAGS += -no-integrated-as 578endif 579CLANG_FLAGS += -Werror=unknown-warning-option 580KBUILD_CFLAGS += $(CLANG_FLAGS) 581KBUILD_AFLAGS += $(CLANG_FLAGS) 582export CLANG_FLAGS 583endif 584 585# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 586# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 587# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 588# and from include/config/auto.conf.cmd to detect the compiler upgrade. 589CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 590 591ifdef config-build 592# =========================================================================== 593# *config targets only - make sure prerequisites are updated, and descend 594# in scripts/kconfig to make the *config target 595 596# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 597# KBUILD_DEFCONFIG may point out an alternative default configuration 598# used for 'make defconfig' 599include arch/$(SRCARCH)/Makefile 600export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 601 602config: outputmakefile scripts_basic FORCE 603 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 604 605%config: outputmakefile scripts_basic FORCE 606 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 607 608else #!config-build 609# =========================================================================== 610# Build targets only - this includes vmlinux, arch specific targets, clean 611# targets and others. In general all targets except *config targets. 612 613# If building an external module we do not care about the all: rule 614# but instead __all depend on modules 615PHONY += all 616ifeq ($(KBUILD_EXTMOD),) 617__all: all 618else 619__all: modules 620endif 621 622# Decide whether to build built-in, modular, or both. 623# Normally, just do built-in. 624 625KBUILD_MODULES := 626KBUILD_BUILTIN := 1 627 628# If we have only "make modules", don't compile built-in objects. 629ifeq ($(MAKECMDGOALS),modules) 630 KBUILD_BUILTIN := 631endif 632 633# If we have "make <whatever> modules", compile modules 634# in addition to whatever we do anyway. 635# Just "make" or "make all" shall build modules as well 636 637ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 638 KBUILD_MODULES := 1 639endif 640 641ifeq ($(MAKECMDGOALS),) 642 KBUILD_MODULES := 1 643endif 644 645export KBUILD_MODULES KBUILD_BUILTIN 646 647ifdef need-config 648include include/config/auto.conf 649endif 650 651ifeq ($(KBUILD_EXTMOD),) 652# Objects we will link into vmlinux / subdirs we need to visit 653core-y := init/ usr/ 654drivers-y := drivers/ sound/ 655drivers-$(CONFIG_SAMPLES) += samples/ 656drivers-y += net/ virt/ 657libs-y := lib/ 658endif # KBUILD_EXTMOD 659 660# The all: target is the default when no target is given on the 661# command line. 662# This allow a user to issue only 'make' to build a kernel including modules 663# Defaults to vmlinux, but the arch makefile usually adds further targets 664all: vmlinux 665 666CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 667 $(call cc-option,-fno-tree-loop-im) \ 668 $(call cc-disable-warning,maybe-uninitialized,) 669export CFLAGS_GCOV 670 671# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 672ifdef CONFIG_FUNCTION_TRACER 673 CC_FLAGS_FTRACE := -pg 674endif 675 676RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 677RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 678RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 679RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 680RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 681RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 682export RETPOLINE_CFLAGS 683export RETPOLINE_VDSO_CFLAGS 684 685include arch/$(SRCARCH)/Makefile 686 687ifdef need-config 688ifdef may-sync-config 689# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 690# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 691# because some architectures define CROSS_COMPILE there. 692include include/config/auto.conf.cmd 693 694$(KCONFIG_CONFIG): 695 @echo >&2 '***' 696 @echo >&2 '*** Configuration file "$@" not found!' 697 @echo >&2 '***' 698 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 699 @echo >&2 '*** "make menuconfig" or "make xconfig").' 700 @echo >&2 '***' 701 @/bin/false 702 703# The actual configuration files used during the build are stored in 704# include/generated/ and include/config/. Update them if .config is newer than 705# include/config/auto.conf (which mirrors .config). 706# 707# This exploits the 'multi-target pattern rule' trick. 708# The syncconfig should be executed only once to make all the targets. 709# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 710%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 711 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 712else # !may-sync-config 713# External modules and some install targets need include/generated/autoconf.h 714# and include/config/auto.conf but do not care if they are up-to-date. 715# Use auto.conf to trigger the test 716PHONY += include/config/auto.conf 717 718include/config/auto.conf: 719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 720 echo >&2; \ 721 echo >&2 " ERROR: Kernel configuration is invalid."; \ 722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 724 echo >&2 ; \ 725 /bin/false) 726 727endif # may-sync-config 728endif # need-config 729 730KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 731KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 732KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 733KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 734KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 735 736ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 737KBUILD_CFLAGS += -O2 738else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 739KBUILD_CFLAGS += -O3 740else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 741KBUILD_CFLAGS += -Os 742endif 743 744# Tell gcc to never replace conditional load with a non-conditional one 745KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 746KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 747 748include scripts/Makefile.kcov 749include scripts/Makefile.gcc-plugins 750 751ifdef CONFIG_READABLE_ASM 752# Disable optimizations that make assembler listings hard to read. 753# reorder blocks reorders the control in the function 754# ipa clone creates specialized cloned functions 755# partial inlining inlines only parts of functions 756KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 757 $(call cc-option,-fno-ipa-cp-clone,) \ 758 $(call cc-option,-fno-partial-inlining) 759endif 760 761ifneq ($(CONFIG_FRAME_WARN),0) 762KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 763endif 764 765stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 766stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 767stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 768 769KBUILD_CFLAGS += $(stackp-flags-y) 770 771ifdef CONFIG_CC_IS_CLANG 772KBUILD_CPPFLAGS += -Qunused-arguments 773KBUILD_CFLAGS += -Wno-format-invalid-specifier 774KBUILD_CFLAGS += -Wno-gnu 775# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 776# source of a reference will be _MergedGlobals and not on of the whitelisted names. 777# See modpost pattern 2 778KBUILD_CFLAGS += -mno-global-merge 779else 780 781# These warnings generated too much noise in a regular build. 782# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 783KBUILD_CFLAGS += -Wno-unused-but-set-variable 784 785# Warn about unmarked fall-throughs in switch statement. 786# Disabled for clang while comment to attribute conversion happens and 787# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 788KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 789endif 790 791KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 792ifdef CONFIG_FRAME_POINTER 793KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 794else 795# Some targets (ARM with Thumb2, for example), can't be built with frame 796# pointers. For those, we don't have FUNCTION_TRACER automatically 797# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 798# incompatible with -fomit-frame-pointer with current GCC, so we don't use 799# -fomit-frame-pointer with FUNCTION_TRACER. 800ifndef CONFIG_FUNCTION_TRACER 801KBUILD_CFLAGS += -fomit-frame-pointer 802endif 803endif 804 805# Initialize all stack variables with a pattern, if desired. 806ifdef CONFIG_INIT_STACK_ALL 807KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 808endif 809 810DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 811 812ifdef CONFIG_DEBUG_INFO 813ifdef CONFIG_DEBUG_INFO_SPLIT 814DEBUG_CFLAGS += -gsplit-dwarf 815else 816DEBUG_CFLAGS += -g 817endif 818KBUILD_AFLAGS += -Wa,-gdwarf-2 819endif 820ifdef CONFIG_DEBUG_INFO_DWARF4 821DEBUG_CFLAGS += -gdwarf-4 822endif 823 824ifdef CONFIG_DEBUG_INFO_REDUCED 825DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 826 $(call cc-option,-fno-var-tracking) 827endif 828 829ifdef CONFIG_DEBUG_INFO_COMPRESSED 830DEBUG_CFLAGS += -gz=zlib 831KBUILD_AFLAGS += -gz=zlib 832KBUILD_LDFLAGS += --compress-debug-sections=zlib 833endif 834 835KBUILD_CFLAGS += $(DEBUG_CFLAGS) 836export DEBUG_CFLAGS 837 838ifdef CONFIG_FUNCTION_TRACER 839ifdef CONFIG_FTRACE_MCOUNT_RECORD 840 # gcc 5 supports generating the mcount tables directly 841 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 842 CC_FLAGS_FTRACE += -mrecord-mcount 843 export CC_USING_RECORD_MCOUNT := 1 844 endif 845 ifdef CONFIG_HAVE_NOP_MCOUNT 846 ifeq ($(call cc-option-yn, -mnop-mcount),y) 847 CC_FLAGS_FTRACE += -mnop-mcount 848 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 849 endif 850 endif 851endif 852ifdef CONFIG_HAVE_FENTRY 853 ifeq ($(call cc-option-yn, -mfentry),y) 854 CC_FLAGS_FTRACE += -mfentry 855 CC_FLAGS_USING += -DCC_USING_FENTRY 856 endif 857endif 858export CC_FLAGS_FTRACE 859KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 860KBUILD_AFLAGS += $(CC_FLAGS_USING) 861ifdef CONFIG_DYNAMIC_FTRACE 862 ifdef CONFIG_HAVE_C_RECORDMCOUNT 863 BUILD_C_RECORDMCOUNT := y 864 export BUILD_C_RECORDMCOUNT 865 endif 866endif 867endif 868 869# We trigger additional mismatches with less inlining 870ifdef CONFIG_DEBUG_SECTION_MISMATCH 871KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 872endif 873 874ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 875KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 876LDFLAGS_vmlinux += --gc-sections 877endif 878 879ifdef CONFIG_LIVEPATCH 880KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 881endif 882 883ifdef CONFIG_SHADOW_CALL_STACK 884CC_FLAGS_SCS := -fsanitize=shadow-call-stack 885KBUILD_CFLAGS += $(CC_FLAGS_SCS) 886export CC_FLAGS_SCS 887endif 888 889# arch Makefile may override CC so keep this after arch Makefile is included 890NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 891 892# warn about C99 declaration after statement 893KBUILD_CFLAGS += -Wdeclaration-after-statement 894 895# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 896KBUILD_CFLAGS += -Wvla 897 898# disable pointer signed / unsigned warnings in gcc 4.0 899KBUILD_CFLAGS += -Wno-pointer-sign 900 901# disable stringop warnings in gcc 8+ 902KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 903 904# We'll want to enable this eventually, but it's not going away for 5.7 at least 905KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 906KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 907KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 908 909# Another good warning that we'll want to enable eventually 910KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 911 912# Enabled with W=2, disabled by default as noisy 913KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 914 915# disable invalid "can't wrap" optimizations for signed / pointers 916KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 917 918# clang sets -fmerge-all-constants by default as optimization, but this 919# is non-conforming behavior for C and in fact breaks the kernel, so we 920# need to disable it here generally. 921KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 922 923# for gcc -fno-merge-all-constants disables everything, but it is fine 924# to have actual conforming behavior enabled. 925KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 926 927# Make sure -fstack-check isn't enabled (like gentoo apparently did) 928KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 929 930# conserve stack if available 931KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 932 933# Prohibit date/time macros, which would make the build non-deterministic 934KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 935 936# enforce correct pointer usage 937KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 938 939# Require designated initializers for all marked structures 940KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 941 942# change __FILE__ to the relative path from the srctree 943KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 944 945# ensure -fcf-protection is disabled when using retpoline as it is 946# incompatible with -mindirect-branch=thunk-extern 947ifdef CONFIG_RETPOLINE 948KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 949endif 950 951include scripts/Makefile.kasan 952include scripts/Makefile.extrawarn 953include scripts/Makefile.ubsan 954include scripts/Makefile.kcsan 955 956# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 957KBUILD_CPPFLAGS += $(KCPPFLAGS) 958KBUILD_AFLAGS += $(KAFLAGS) 959KBUILD_CFLAGS += $(KCFLAGS) 960 961KBUILD_LDFLAGS_MODULE += --build-id 962LDFLAGS_vmlinux += --build-id 963 964ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 965LDFLAGS_vmlinux += $(call ld-option, -X,) 966endif 967 968ifeq ($(CONFIG_RELR),y) 969LDFLAGS_vmlinux += --pack-dyn-relocs=relr 970endif 971 972# Align the bit size of userspace programs with the kernel 973KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 974KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 975 976# make the checker run with the right architecture 977CHECKFLAGS += --arch=$(ARCH) 978 979# insure the checker run with the right endianness 980CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 981 982# the checker needs the correct machine size 983CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 984 985# Default kernel image to build when no specific target is given. 986# KBUILD_IMAGE may be overruled on the command line or 987# set in the environment 988# Also any assignments in arch/$(ARCH)/Makefile take precedence over 989# this default value 990export KBUILD_IMAGE ?= vmlinux 991 992# 993# INSTALL_PATH specifies where to place the updated kernel and system map 994# images. Default is /boot, but you can set it to other values 995export INSTALL_PATH ?= /boot 996 997# 998# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 999# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1000# an argument if needed. Otherwise it defaults to the kernel install path 1001# 1002export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1003 1004# 1005# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1006# relocations required by build roots. This is not defined in the 1007# makefile but the argument can be passed to make if needed. 1008# 1009 1010MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1011export MODLIB 1012 1013# 1014# INSTALL_MOD_STRIP, if defined, will cause modules to be 1015# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1016# the default option --strip-debug will be used. Otherwise, 1017# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1018 1019ifdef INSTALL_MOD_STRIP 1020ifeq ($(INSTALL_MOD_STRIP),1) 1021mod_strip_cmd = $(STRIP) --strip-debug 1022else 1023mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1024endif # INSTALL_MOD_STRIP=1 1025else 1026mod_strip_cmd = true 1027endif # INSTALL_MOD_STRIP 1028export mod_strip_cmd 1029 1030# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1031# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1032# or CONFIG_MODULE_COMPRESS_XZ. 1033 1034mod_compress_cmd = true 1035ifdef CONFIG_MODULE_COMPRESS 1036 ifdef CONFIG_MODULE_COMPRESS_GZIP 1037 mod_compress_cmd = $(KGZIP) -n -f 1038 endif # CONFIG_MODULE_COMPRESS_GZIP 1039 ifdef CONFIG_MODULE_COMPRESS_XZ 1040 mod_compress_cmd = $(XZ) -f 1041 endif # CONFIG_MODULE_COMPRESS_XZ 1042endif # CONFIG_MODULE_COMPRESS 1043export mod_compress_cmd 1044 1045ifdef CONFIG_MODULE_SIG_ALL 1046$(eval $(call config_filename,MODULE_SIG_KEY)) 1047 1048mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1049else 1050mod_sign_cmd = true 1051endif 1052export mod_sign_cmd 1053 1054HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1055 1056ifdef CONFIG_STACK_VALIDATION 1057 has_libelf := $(call try-run,\ 1058 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1059 ifeq ($(has_libelf),1) 1060 objtool_target := tools/objtool FORCE 1061 else 1062 SKIP_STACK_VALIDATION := 1 1063 export SKIP_STACK_VALIDATION 1064 endif 1065endif 1066 1067PHONY += prepare0 1068 1069export MODORDER := $(extmod-prefix)modules.order 1070export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1071 1072ifeq ($(KBUILD_EXTMOD),) 1073core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1074 1075vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1076 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1077 $(libs-y) $(libs-m))) 1078 1079vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1080 $(patsubst %/,%,$(filter %/, $(core-) \ 1081 $(drivers-) $(libs-)))) 1082 1083subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1084 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1085 $(drivers-y) $(drivers-m))) 1086 1087build-dirs := $(vmlinux-dirs) 1088clean-dirs := $(vmlinux-alldirs) 1089 1090# Externally visible symbols (used by link-vmlinux.sh) 1091KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1092KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1093ifdef CONFIG_MODULES 1094KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1095KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1096else 1097KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1098endif 1099KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1100 1101export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1102export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1103export LDFLAGS_vmlinux 1104# used by scripts/Makefile.package 1105export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1106 1107vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1108 1109# Recurse until adjust_autoksyms.sh is satisfied 1110PHONY += autoksyms_recursive 1111ifdef CONFIG_TRIM_UNUSED_KSYMS 1112# For the kernel to actually contain only the needed exported symbols, 1113# we have to build modules as well to determine what those symbols are. 1114# (this can be evaluated only once include/config/auto.conf has been included) 1115KBUILD_MODULES := 1 1116 1117autoksyms_recursive: descend modules.order 1118 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1119 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1120endif 1121 1122autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1123 1124quiet_cmd_autoksyms_h = GEN $@ 1125 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1126 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1127 1128$(autoksyms_h): 1129 $(call cmd,autoksyms_h) 1130 1131ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1132 1133# Final link of vmlinux with optional arch pass after final link 1134cmd_link-vmlinux = \ 1135 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1136 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1137 1138vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1139 +$(call if_changed,link-vmlinux) 1140 1141targets := vmlinux 1142 1143# The actual objects are generated when descending, 1144# make sure no implicit rule kicks in 1145$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1146 1147filechk_kernel.release = \ 1148 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1149 1150# Store (new) KERNELRELEASE string in include/config/kernel.release 1151include/config/kernel.release: FORCE 1152 $(call filechk,kernel.release) 1153 1154# Additional helpers built in scripts/ 1155# Carefully list dependencies so we do not try to build scripts twice 1156# in parallel 1157PHONY += scripts 1158scripts: scripts_basic scripts_dtc 1159 $(Q)$(MAKE) $(build)=$(@) 1160 1161# Things we need to do before we recursively start building the kernel 1162# or the modules are listed in "prepare". 1163# A multi level approach is used. prepareN is processed before prepareN-1. 1164# archprepare is used in arch Makefiles and when processed asm symlink, 1165# version.h and scripts_basic is processed / created. 1166 1167PHONY += prepare archprepare 1168 1169archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1170 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1171 include/generated/autoconf.h 1172 1173prepare0: archprepare 1174 $(Q)$(MAKE) $(build)=scripts/mod 1175 $(Q)$(MAKE) $(build)=. 1176 1177# All the preparing.. 1178prepare: prepare0 prepare-objtool 1179 1180# Support for using generic headers in asm-generic 1181asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1182 1183PHONY += asm-generic uapi-asm-generic 1184asm-generic: uapi-asm-generic 1185 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1186 generic=include/asm-generic 1187uapi-asm-generic: 1188 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1189 generic=include/uapi/asm-generic 1190 1191PHONY += prepare-objtool 1192prepare-objtool: $(objtool_target) 1193ifeq ($(SKIP_STACK_VALIDATION),1) 1194ifdef CONFIG_UNWINDER_ORC 1195 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1196 @false 1197else 1198 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1199endif 1200endif 1201 1202# Generate some files 1203# --------------------------------------------------------------------------- 1204 1205# KERNELRELEASE can change from a few different places, meaning version.h 1206# needs to be updated, so this check is forced on all builds 1207 1208uts_len := 64 1209define filechk_utsrelease.h 1210 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1211 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1212 exit 1; \ 1213 fi; \ 1214 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1215endef 1216 1217define filechk_version.h 1218 echo \#define LINUX_VERSION_CODE $(shell \ 1219 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1220 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1221endef 1222 1223$(version_h): FORCE 1224 $(call filechk,version.h) 1225 $(Q)rm -f $(old_version_h) 1226 1227include/generated/utsrelease.h: include/config/kernel.release FORCE 1228 $(call filechk,utsrelease.h) 1229 1230PHONY += headerdep 1231headerdep: 1232 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1233 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1234 1235# --------------------------------------------------------------------------- 1236# Kernel headers 1237 1238#Default location for installed headers 1239export INSTALL_HDR_PATH = $(objtree)/usr 1240 1241quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1242 cmd_headers_install = \ 1243 mkdir -p $(INSTALL_HDR_PATH); \ 1244 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1245 usr/include $(INSTALL_HDR_PATH) 1246 1247PHONY += headers_install 1248headers_install: headers 1249 $(call cmd,headers_install) 1250 1251PHONY += archheaders archscripts 1252 1253hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1254 1255PHONY += headers 1256headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1257 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1258 $(error Headers not exportable for the $(SRCARCH) architecture)) 1259 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1260 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1261 1262# Deprecated. It is no-op now. 1263PHONY += headers_check 1264headers_check: 1265 @: 1266 1267ifdef CONFIG_HEADERS_INSTALL 1268prepare: headers 1269endif 1270 1271PHONY += scripts_unifdef 1272scripts_unifdef: scripts_basic 1273 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1274 1275# --------------------------------------------------------------------------- 1276# Kernel selftest 1277 1278PHONY += kselftest 1279kselftest: 1280 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1281 1282kselftest-%: FORCE 1283 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1284 1285PHONY += kselftest-merge 1286kselftest-merge: 1287 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1288 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1289 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1290 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1291 1292# --------------------------------------------------------------------------- 1293# Devicetree files 1294 1295ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1296dtstree := arch/$(SRCARCH)/boot/dts 1297endif 1298 1299ifneq ($(dtstree),) 1300 1301%.dtb: include/config/kernel.release scripts_dtc 1302 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1303 1304PHONY += dtbs dtbs_install dtbs_check 1305dtbs: include/config/kernel.release scripts_dtc 1306 $(Q)$(MAKE) $(build)=$(dtstree) 1307 1308ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1309export CHECK_DTBS=y 1310dtbs: dt_binding_check 1311endif 1312 1313dtbs_check: dtbs 1314 1315dtbs_install: 1316 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1317 1318ifdef CONFIG_OF_EARLY_FLATTREE 1319all: dtbs 1320endif 1321 1322endif 1323 1324PHONY += scripts_dtc 1325scripts_dtc: scripts_basic 1326 $(Q)$(MAKE) $(build)=scripts/dtc 1327 1328ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1329export CHECK_DT_BINDING=y 1330endif 1331 1332PHONY += dt_binding_check 1333dt_binding_check: scripts_dtc 1334 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1335 1336# --------------------------------------------------------------------------- 1337# Modules 1338 1339ifdef CONFIG_MODULES 1340 1341# By default, build modules as well 1342 1343all: modules 1344 1345# When we're building modules with modversions, we need to consider 1346# the built-in objects during the descend as well, in order to 1347# make sure the checksums are up to date before we record them. 1348ifdef CONFIG_MODVERSIONS 1349 KBUILD_BUILTIN := 1 1350endif 1351 1352# Build modules 1353# 1354# A module can be listed more than once in obj-m resulting in 1355# duplicate lines in modules.order files. Those are removed 1356# using awk while concatenating to the final file. 1357 1358PHONY += modules 1359modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1360 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1361 1362PHONY += modules_check 1363modules_check: modules.order 1364 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1365 1366cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1367 1368modules.order: $(subdir-modorder) FORCE 1369 $(call if_changed,modules_order) 1370 1371targets += modules.order 1372 1373# Target to prepare building external modules 1374PHONY += modules_prepare 1375modules_prepare: prepare 1376 1377# Target to install modules 1378PHONY += modules_install 1379modules_install: _modinst_ _modinst_post 1380 1381PHONY += _modinst_ 1382_modinst_: 1383 @rm -rf $(MODLIB)/kernel 1384 @rm -f $(MODLIB)/source 1385 @mkdir -p $(MODLIB)/kernel 1386 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1387 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1388 rm -f $(MODLIB)/build ; \ 1389 ln -s $(CURDIR) $(MODLIB)/build ; \ 1390 fi 1391 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1392 @cp -f modules.builtin $(MODLIB)/ 1393 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1394 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1395 1396# This depmod is only for convenience to give the initial 1397# boot a modules.dep even before / is mounted read-write. However the 1398# boot script depmod is the master version. 1399PHONY += _modinst_post 1400_modinst_post: _modinst_ 1401 $(call cmd,depmod) 1402 1403ifeq ($(CONFIG_MODULE_SIG), y) 1404PHONY += modules_sign 1405modules_sign: 1406 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1407endif 1408 1409else # CONFIG_MODULES 1410 1411# Modules not configured 1412# --------------------------------------------------------------------------- 1413 1414PHONY += modules modules_install 1415modules modules_install: 1416 @echo >&2 1417 @echo >&2 "The present kernel configuration has modules disabled." 1418 @echo >&2 "Type 'make config' and enable loadable module support." 1419 @echo >&2 "Then build a kernel with module support enabled." 1420 @echo >&2 1421 @exit 1 1422 1423endif # CONFIG_MODULES 1424 1425### 1426# Cleaning is done on three levels. 1427# make clean Delete most generated files 1428# Leave enough to build external modules 1429# make mrproper Delete the current configuration, and all generated files 1430# make distclean Remove editor backup files, patch leftover files and the like 1431 1432# Directories & files removed with 'make clean' 1433CLEAN_FILES += include/ksym vmlinux.symvers \ 1434 modules.builtin modules.builtin.modinfo modules.nsdeps 1435 1436# Directories & files removed with 'make mrproper' 1437MRPROPER_FILES += include/config include/generated \ 1438 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1439 debian snap tar-install \ 1440 .config .config.old .version \ 1441 Module.symvers \ 1442 signing_key.pem signing_key.priv signing_key.x509 \ 1443 x509.genkey extra_certificates signing_key.x509.keyid \ 1444 signing_key.x509.signer vmlinux-gdb.py \ 1445 *.spec 1446 1447# Directories & files removed with 'make distclean' 1448DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1449 1450# clean - Delete most, but leave enough to build external modules 1451# 1452clean: rm-files := $(CLEAN_FILES) 1453 1454PHONY += archclean vmlinuxclean 1455 1456vmlinuxclean: 1457 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1458 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1459 1460clean: archclean vmlinuxclean 1461 1462# mrproper - Delete all generated files, including .config 1463# 1464mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1465mrproper-dirs := $(addprefix _mrproper_,scripts) 1466 1467PHONY += $(mrproper-dirs) mrproper 1468$(mrproper-dirs): 1469 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1470 1471mrproper: clean $(mrproper-dirs) 1472 $(call cmd,rmfiles) 1473 1474# distclean 1475# 1476distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1477 1478PHONY += distclean 1479 1480distclean: mrproper 1481 $(call cmd,rmfiles) 1482 @find $(srctree) $(RCS_FIND_IGNORE) \ 1483 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1484 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1485 -o -name 'core' \) \ 1486 -type f -print | xargs rm -f 1487 1488 1489# Packaging of the kernel to various formats 1490# --------------------------------------------------------------------------- 1491 1492%src-pkg: FORCE 1493 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1494%pkg: include/config/kernel.release FORCE 1495 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1496 1497# Brief documentation of the typical targets used 1498# --------------------------------------------------------------------------- 1499 1500boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1501boards := $(sort $(notdir $(boards))) 1502board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1503board-dirs := $(sort $(notdir $(board-dirs:/=))) 1504 1505PHONY += help 1506help: 1507 @echo 'Cleaning targets:' 1508 @echo ' clean - Remove most generated files but keep the config and' 1509 @echo ' enough build support to build external modules' 1510 @echo ' mrproper - Remove all generated files + config + various backup files' 1511 @echo ' distclean - mrproper + remove editor backup and patch files' 1512 @echo '' 1513 @echo 'Configuration targets:' 1514 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1515 @echo '' 1516 @echo 'Other generic targets:' 1517 @echo ' all - Build all targets marked with [*]' 1518 @echo '* vmlinux - Build the bare kernel' 1519 @echo '* modules - Build all modules' 1520 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1521 @echo ' dir/ - Build all files in dir and below' 1522 @echo ' dir/file.[ois] - Build specified target only' 1523 @echo ' dir/file.ll - Build the LLVM assembly file' 1524 @echo ' (requires compiler support for LLVM assembly generation)' 1525 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1526 @echo ' (requires a recent binutils and recent build (System.map))' 1527 @echo ' dir/file.ko - Build module including final link' 1528 @echo ' modules_prepare - Set up for building external modules' 1529 @echo ' tags/TAGS - Generate tags file for editors' 1530 @echo ' cscope - Generate cscope index' 1531 @echo ' gtags - Generate GNU GLOBAL index' 1532 @echo ' kernelrelease - Output the release version string (use with make -s)' 1533 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1534 @echo ' image_name - Output the image name (use with make -s)' 1535 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1536 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1537 echo '' 1538 @echo 'Static analysers:' 1539 @echo ' checkstack - Generate a list of stack hogs' 1540 @echo ' namespacecheck - Name space analysis on compiled kernel' 1541 @echo ' versioncheck - Sanity check on version.h usage' 1542 @echo ' includecheck - Check for duplicate included header files' 1543 @echo ' export_report - List the usages of all exported symbols' 1544 @echo ' headerdep - Detect inclusion cycles in headers' 1545 @echo ' coccicheck - Check with Coccinelle' 1546 @echo '' 1547 @echo 'Tools:' 1548 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1549 @echo '' 1550 @echo 'Kernel selftest:' 1551 @echo ' kselftest - Build and run kernel selftest' 1552 @echo ' Build, install, and boot kernel before' 1553 @echo ' running kselftest on it' 1554 @echo ' Run as root for full coverage' 1555 @echo ' kselftest-all - Build kernel selftest' 1556 @echo ' kselftest-install - Build and install kernel selftest' 1557 @echo ' kselftest-clean - Remove all generated kselftest files' 1558 @echo ' kselftest-merge - Merge all the config dependencies of' 1559 @echo ' kselftest to existing .config.' 1560 @echo '' 1561 @$(if $(dtstree), \ 1562 echo 'Devicetree:'; \ 1563 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1564 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1565 echo ' dt_binding_check - Validate device tree binding documents'; \ 1566 echo ' dtbs_check - Validate device tree source files';\ 1567 echo '') 1568 1569 @echo 'Userspace tools targets:' 1570 @echo ' use "make tools/help"' 1571 @echo ' or "cd tools; make help"' 1572 @echo '' 1573 @echo 'Kernel packaging:' 1574 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1575 @echo '' 1576 @echo 'Documentation targets:' 1577 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1578 @echo '' 1579 @echo 'Architecture specific targets ($(SRCARCH)):' 1580 @$(if $(archhelp),$(archhelp),\ 1581 echo ' No architecture specific help defined for $(SRCARCH)') 1582 @echo '' 1583 @$(if $(boards), \ 1584 $(foreach b, $(boards), \ 1585 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1586 echo '') 1587 @$(if $(board-dirs), \ 1588 $(foreach b, $(board-dirs), \ 1589 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1590 printf " %-16s - Show all of the above\\n" help-boards; \ 1591 echo '') 1592 1593 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1594 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1595 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1596 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1597 @echo ' (sparse by default)' 1598 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1599 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1600 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1601 @echo ' 1: warnings which may be relevant and do not occur too often' 1602 @echo ' 2: warnings which occur quite often but may still be relevant' 1603 @echo ' 3: more obscure warnings, can most likely be ignored' 1604 @echo ' Multiple levels can be combined with W=12 or W=123' 1605 @echo '' 1606 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1607 @echo 'For further info see the ./README file' 1608 1609 1610help-board-dirs := $(addprefix help-,$(board-dirs)) 1611 1612help-boards: $(help-board-dirs) 1613 1614boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1615 1616$(help-board-dirs): help-%: 1617 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1618 @$(if $(boards-per-dir), \ 1619 $(foreach b, $(boards-per-dir), \ 1620 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1621 echo '') 1622 1623 1624# Documentation targets 1625# --------------------------------------------------------------------------- 1626DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1627 linkcheckdocs dochelp refcheckdocs 1628PHONY += $(DOC_TARGETS) 1629$(DOC_TARGETS): 1630 $(Q)$(MAKE) $(build)=Documentation $@ 1631 1632# Misc 1633# --------------------------------------------------------------------------- 1634 1635PHONY += scripts_gdb 1636scripts_gdb: prepare0 1637 $(Q)$(MAKE) $(build)=scripts/gdb 1638 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1639 1640ifdef CONFIG_GDB_SCRIPTS 1641all: scripts_gdb 1642endif 1643 1644else # KBUILD_EXTMOD 1645 1646### 1647# External module support. 1648# When building external modules the kernel used as basis is considered 1649# read-only, and no consistency checks are made and the make 1650# system is not used on the basis kernel. If updates are required 1651# in the basis kernel ordinary make commands (without M=...) must 1652# be used. 1653# 1654# The following are the only valid targets when building external 1655# modules. 1656# make M=dir clean Delete all automatically generated files 1657# make M=dir modules Make all modules in specified dir 1658# make M=dir Same as 'make M=dir modules' 1659# make M=dir modules_install 1660# Install the modules built in the module directory 1661# Assumes install directory is already created 1662 1663# We are always building modules 1664KBUILD_MODULES := 1 1665 1666build-dirs := $(KBUILD_EXTMOD) 1667PHONY += modules 1668modules: descend 1669 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1670 1671PHONY += modules_install 1672modules_install: _emodinst_ _emodinst_post 1673 1674install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1675PHONY += _emodinst_ 1676_emodinst_: 1677 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1678 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1679 1680PHONY += _emodinst_post 1681_emodinst_post: _emodinst_ 1682 $(call cmd,depmod) 1683 1684clean-dirs := $(KBUILD_EXTMOD) 1685clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1686 1687PHONY += help 1688help: 1689 @echo ' Building external modules.' 1690 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1691 @echo '' 1692 @echo ' modules - default target, build the module(s)' 1693 @echo ' modules_install - install the module' 1694 @echo ' clean - remove generated files in module directory only' 1695 @echo '' 1696 1697PHONY += prepare 1698endif # KBUILD_EXTMOD 1699 1700# Single targets 1701# --------------------------------------------------------------------------- 1702# To build individual files in subdirectories, you can do like this: 1703# 1704# make foo/bar/baz.s 1705# 1706# The supported suffixes for single-target are listed in 'single-targets' 1707# 1708# To build only under specific subdirectories, you can do like this: 1709# 1710# make foo/bar/baz/ 1711 1712ifdef single-build 1713 1714# .ko is special because modpost is needed 1715single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1716single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1717 1718$(single-ko): single_modpost 1719 @: 1720$(single-no-ko): descend 1721 @: 1722 1723ifeq ($(KBUILD_EXTMOD),) 1724# For the single build of in-tree modules, use a temporary file to avoid 1725# the situation of modules_install installing an invalid modules.order. 1726MODORDER := .modules.tmp 1727endif 1728 1729PHONY += single_modpost 1730single_modpost: $(single-no-ko) 1731 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1732 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1733 1734KBUILD_MODULES := 1 1735 1736export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1737 1738# trim unrelated directories 1739build-dirs := $(foreach d, $(build-dirs), \ 1740 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1741 1742endif 1743 1744ifndef CONFIG_MODULES 1745KBUILD_MODULES := 1746endif 1747 1748# Handle descending into subdirectories listed in $(build-dirs) 1749# Preset locale variables to speed up the build process. Limit locale 1750# tweaks to this spot to avoid wrong language settings when running 1751# make menuconfig etc. 1752# Error messages still appears in the original language 1753PHONY += descend $(build-dirs) 1754descend: $(build-dirs) 1755$(build-dirs): prepare 1756 $(Q)$(MAKE) $(build)=$@ \ 1757 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1758 need-builtin=1 need-modorder=1 1759 1760clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1761PHONY += $(clean-dirs) clean 1762$(clean-dirs): 1763 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1764 1765clean: $(clean-dirs) 1766 $(call cmd,rmfiles) 1767 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1768 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1769 -o -name '*.ko.*' \ 1770 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1771 -o -name '*.dwo' -o -name '*.lst' \ 1772 -o -name '*.su' -o -name '*.mod' \ 1773 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1774 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1775 -o -name '*.asn1.[ch]' \ 1776 -o -name '*.symtypes' -o -name 'modules.order' \ 1777 -o -name '.tmp_*.o.*' \ 1778 -o -name '*.c.[012]*.*' \ 1779 -o -name '*.ll' \ 1780 -o -name '*.gcno' \) -type f -print | xargs rm -f 1781 1782# Generate tags for editors 1783# --------------------------------------------------------------------------- 1784quiet_cmd_tags = GEN $@ 1785 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1786 1787tags TAGS cscope gtags: FORCE 1788 $(call cmd,tags) 1789 1790# Script to generate missing namespace dependencies 1791# --------------------------------------------------------------------------- 1792 1793PHONY += nsdeps 1794nsdeps: export KBUILD_NSDEPS=1 1795nsdeps: modules 1796 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1797 1798# Scripts to check various things for consistency 1799# --------------------------------------------------------------------------- 1800 1801PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1802 1803includecheck: 1804 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1805 -name '*.[hcS]' -type f -print | sort \ 1806 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1807 1808versioncheck: 1809 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1810 -name '*.[hcS]' -type f -print | sort \ 1811 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1812 1813coccicheck: 1814 $(Q)$(BASH) $(srctree)/scripts/$@ 1815 1816namespacecheck: 1817 $(PERL) $(srctree)/scripts/namespace.pl 1818 1819export_report: 1820 $(PERL) $(srctree)/scripts/export_report.pl 1821 1822PHONY += checkstack kernelrelease kernelversion image_name 1823 1824# UML needs a little special treatment here. It wants to use the host 1825# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1826# else wants $(ARCH), including people doing cross-builds, which means 1827# that $(SUBARCH) doesn't work here. 1828ifeq ($(ARCH), um) 1829CHECKSTACK_ARCH := $(SUBARCH) 1830else 1831CHECKSTACK_ARCH := $(ARCH) 1832endif 1833checkstack: 1834 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1835 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1836 1837kernelrelease: 1838 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1839 1840kernelversion: 1841 @echo $(KERNELVERSION) 1842 1843image_name: 1844 @echo $(KBUILD_IMAGE) 1845 1846# Clear a bunch of variables before executing the submake 1847 1848ifeq ($(quiet),silent_) 1849tools_silent=s 1850endif 1851 1852tools/: FORCE 1853 $(Q)mkdir -p $(objtree)/tools 1854 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1855 1856tools/%: FORCE 1857 $(Q)mkdir -p $(objtree)/tools 1858 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1859 1860quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1861 cmd_rmfiles = rm -rf $(rm-files) 1862 1863# Run depmod only if we have System.map and depmod is executable 1864quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1865 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1866 $(KERNELRELEASE) 1867 1868# read saved command lines for existing targets 1869existing-targets := $(wildcard $(sort $(targets))) 1870 1871-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1872 1873endif # config-build 1874endif # mixed-build 1875endif # need-sub-make 1876 1877PHONY += FORCE 1878FORCE: 1879 1880# Declare the contents of the PHONY variable as phony. We keep that 1881# information in a variable so we can use it in if_changed and friends. 1882.PHONY: $(PHONY) 1883