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 467ZSTD = zstd 468 469CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 471NOSTDINC_FLAGS := 472CFLAGS_MODULE = 473AFLAGS_MODULE = 474LDFLAGS_MODULE = 475CFLAGS_KERNEL = 476AFLAGS_KERNEL = 477LDFLAGS_vmlinux = 478 479# Use USERINCLUDE when you must reference the UAPI directories only. 480USERINCLUDE := \ 481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 483 -I$(srctree)/include/uapi \ 484 -I$(objtree)/include/generated/uapi \ 485 -include $(srctree)/include/linux/kconfig.h 486 487# Use LINUXINCLUDE when you must reference the include/ directory. 488# Needed to be compatible with the O= option 489LINUXINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 492 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 493 -I$(objtree)/include \ 494 $(USERINCLUDE) 495 496KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 497KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 499 -Werror=implicit-function-declaration -Werror=implicit-int \ 500 -Wno-format-security \ 501 -std=gnu89 502KBUILD_CPPFLAGS := -D__KERNEL__ 503KBUILD_AFLAGS_KERNEL := 504KBUILD_CFLAGS_KERNEL := 505KBUILD_AFLAGS_MODULE := -DMODULE 506KBUILD_CFLAGS_MODULE := -DMODULE 507KBUILD_LDFLAGS_MODULE := 508export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 509KBUILD_LDFLAGS := 510GCC_PLUGINS_CFLAGS := 511CLANG_FLAGS := 512 513export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 514export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL 515export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 516export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 517export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 518 519export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 520export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 521export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN 522export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 523export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 524export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 525 526# Files to ignore in find ... statements 527 528export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 529 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 530 -prune -o 531export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 532 --exclude CVS --exclude .pc --exclude .hg --exclude .git 533 534# =========================================================================== 535# Rules shared between *config targets and build targets 536 537# Basic helpers built in scripts/basic/ 538PHONY += scripts_basic 539scripts_basic: 540 $(Q)$(MAKE) $(build)=scripts/basic 541 $(Q)rm -f .tmp_quiet_recordmcount 542 543PHONY += outputmakefile 544# Before starting out-of-tree build, make sure the source tree is clean. 545# outputmakefile generates a Makefile in the output directory, if using a 546# separate output directory. This allows convenient use of make in the 547# output directory. 548# At the same time when output Makefile generated, generate .gitignore to 549# ignore whole output directory 550outputmakefile: 551ifdef building_out_of_srctree 552 $(Q)if [ -f $(srctree)/.config -o \ 553 -d $(srctree)/include/config -o \ 554 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 555 echo >&2 "***"; \ 556 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 557 echo >&2 "*** in $(abs_srctree)";\ 558 echo >&2 "***"; \ 559 false; \ 560 fi 561 $(Q)ln -fsn $(srctree) source 562 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 563 $(Q)test -e .gitignore || \ 564 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 565endif 566 567ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 568ifneq ($(CROSS_COMPILE),) 569CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 570GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 571CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 572GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 573endif 574ifneq ($(GCC_TOOLCHAIN),) 575CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 576endif 577ifneq ($(LLVM_IAS),1) 578CLANG_FLAGS += -no-integrated-as 579endif 580CLANG_FLAGS += -Werror=unknown-warning-option 581KBUILD_CFLAGS += $(CLANG_FLAGS) 582KBUILD_AFLAGS += $(CLANG_FLAGS) 583export CLANG_FLAGS 584endif 585 586# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 587# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 588# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 589# and from include/config/auto.conf.cmd to detect the compiler upgrade. 590CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 591 592ifdef config-build 593# =========================================================================== 594# *config targets only - make sure prerequisites are updated, and descend 595# in scripts/kconfig to make the *config target 596 597# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 598# KBUILD_DEFCONFIG may point out an alternative default configuration 599# used for 'make defconfig' 600include arch/$(SRCARCH)/Makefile 601export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 602 603config: outputmakefile scripts_basic FORCE 604 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 605 606%config: outputmakefile scripts_basic FORCE 607 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 608 609else #!config-build 610# =========================================================================== 611# Build targets only - this includes vmlinux, arch specific targets, clean 612# targets and others. In general all targets except *config targets. 613 614# If building an external module we do not care about the all: rule 615# but instead __all depend on modules 616PHONY += all 617ifeq ($(KBUILD_EXTMOD),) 618__all: all 619else 620__all: modules 621endif 622 623# Decide whether to build built-in, modular, or both. 624# Normally, just do built-in. 625 626KBUILD_MODULES := 627KBUILD_BUILTIN := 1 628 629# If we have only "make modules", don't compile built-in objects. 630ifeq ($(MAKECMDGOALS),modules) 631 KBUILD_BUILTIN := 632endif 633 634# If we have "make <whatever> modules", compile modules 635# in addition to whatever we do anyway. 636# Just "make" or "make all" shall build modules as well 637 638ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 639 KBUILD_MODULES := 1 640endif 641 642ifeq ($(MAKECMDGOALS),) 643 KBUILD_MODULES := 1 644endif 645 646export KBUILD_MODULES KBUILD_BUILTIN 647 648ifdef need-config 649include include/config/auto.conf 650endif 651 652ifeq ($(KBUILD_EXTMOD),) 653# Objects we will link into vmlinux / subdirs we need to visit 654core-y := init/ usr/ 655drivers-y := drivers/ sound/ 656drivers-$(CONFIG_SAMPLES) += samples/ 657drivers-y += net/ virt/ 658libs-y := lib/ 659endif # KBUILD_EXTMOD 660 661# The all: target is the default when no target is given on the 662# command line. 663# This allow a user to issue only 'make' to build a kernel including modules 664# Defaults to vmlinux, but the arch makefile usually adds further targets 665all: vmlinux 666 667CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 668 $(call cc-option,-fno-tree-loop-im) \ 669 $(call cc-disable-warning,maybe-uninitialized,) 670export CFLAGS_GCOV 671 672# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 673ifdef CONFIG_FUNCTION_TRACER 674 CC_FLAGS_FTRACE := -pg 675endif 676 677RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 678RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 679RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 680RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 681RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 682RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 683export RETPOLINE_CFLAGS 684export RETPOLINE_VDSO_CFLAGS 685 686include arch/$(SRCARCH)/Makefile 687 688ifdef need-config 689ifdef may-sync-config 690# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 691# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 692# because some architectures define CROSS_COMPILE there. 693include include/config/auto.conf.cmd 694 695$(KCONFIG_CONFIG): 696 @echo >&2 '***' 697 @echo >&2 '*** Configuration file "$@" not found!' 698 @echo >&2 '***' 699 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 700 @echo >&2 '*** "make menuconfig" or "make xconfig").' 701 @echo >&2 '***' 702 @/bin/false 703 704# The actual configuration files used during the build are stored in 705# include/generated/ and include/config/. Update them if .config is newer than 706# include/config/auto.conf (which mirrors .config). 707# 708# This exploits the 'multi-target pattern rule' trick. 709# The syncconfig should be executed only once to make all the targets. 710# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 711%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 712 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 713else # !may-sync-config 714# External modules and some install targets need include/generated/autoconf.h 715# and include/config/auto.conf but do not care if they are up-to-date. 716# Use auto.conf to trigger the test 717PHONY += include/config/auto.conf 718 719include/config/auto.conf: 720 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 721 echo >&2; \ 722 echo >&2 " ERROR: Kernel configuration is invalid."; \ 723 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 724 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 725 echo >&2 ; \ 726 /bin/false) 727 728endif # may-sync-config 729endif # need-config 730 731KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 732KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 733KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 734KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 735KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 736 737ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 738KBUILD_CFLAGS += -O2 739else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 740KBUILD_CFLAGS += -O3 741else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 742KBUILD_CFLAGS += -Os 743endif 744 745# Tell gcc to never replace conditional load with a non-conditional one 746KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 747KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 748 749include scripts/Makefile.kcov 750include scripts/Makefile.gcc-plugins 751 752ifdef CONFIG_READABLE_ASM 753# Disable optimizations that make assembler listings hard to read. 754# reorder blocks reorders the control in the function 755# ipa clone creates specialized cloned functions 756# partial inlining inlines only parts of functions 757KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 758 $(call cc-option,-fno-ipa-cp-clone,) \ 759 $(call cc-option,-fno-partial-inlining) 760endif 761 762ifneq ($(CONFIG_FRAME_WARN),0) 763KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 764endif 765 766stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 767stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 768stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 769 770KBUILD_CFLAGS += $(stackp-flags-y) 771 772ifdef CONFIG_CC_IS_CLANG 773KBUILD_CPPFLAGS += -Qunused-arguments 774KBUILD_CFLAGS += -Wno-format-invalid-specifier 775KBUILD_CFLAGS += -Wno-gnu 776# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 777# source of a reference will be _MergedGlobals and not on of the whitelisted names. 778# See modpost pattern 2 779KBUILD_CFLAGS += -mno-global-merge 780else 781 782# These warnings generated too much noise in a regular build. 783# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 784KBUILD_CFLAGS += -Wno-unused-but-set-variable 785 786# Warn about unmarked fall-throughs in switch statement. 787# Disabled for clang while comment to attribute conversion happens and 788# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 789KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 790endif 791 792KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 793ifdef CONFIG_FRAME_POINTER 794KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 795else 796# Some targets (ARM with Thumb2, for example), can't be built with frame 797# pointers. For those, we don't have FUNCTION_TRACER automatically 798# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 799# incompatible with -fomit-frame-pointer with current GCC, so we don't use 800# -fomit-frame-pointer with FUNCTION_TRACER. 801ifndef CONFIG_FUNCTION_TRACER 802KBUILD_CFLAGS += -fomit-frame-pointer 803endif 804endif 805 806# Initialize all stack variables with a 0xAA pattern. 807ifdef CONFIG_INIT_STACK_ALL_PATTERN 808KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 809endif 810 811# Initialize all stack variables with a zero value. 812ifdef CONFIG_INIT_STACK_ALL_ZERO 813# Future support for zero initialization is still being debated, see 814# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 815# renamed or dropped. 816KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 817KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 818endif 819 820DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 821 822ifdef CONFIG_DEBUG_INFO 823ifdef CONFIG_DEBUG_INFO_SPLIT 824DEBUG_CFLAGS += -gsplit-dwarf 825else 826DEBUG_CFLAGS += -g 827endif 828KBUILD_AFLAGS += -Wa,-gdwarf-2 829endif 830ifdef CONFIG_DEBUG_INFO_DWARF4 831DEBUG_CFLAGS += -gdwarf-4 832endif 833 834ifdef CONFIG_DEBUG_INFO_REDUCED 835DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 836 $(call cc-option,-fno-var-tracking) 837endif 838 839ifdef CONFIG_DEBUG_INFO_COMPRESSED 840DEBUG_CFLAGS += -gz=zlib 841KBUILD_AFLAGS += -gz=zlib 842KBUILD_LDFLAGS += --compress-debug-sections=zlib 843endif 844 845KBUILD_CFLAGS += $(DEBUG_CFLAGS) 846export DEBUG_CFLAGS 847 848ifdef CONFIG_FUNCTION_TRACER 849ifdef CONFIG_FTRACE_MCOUNT_RECORD 850 # gcc 5 supports generating the mcount tables directly 851 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 852 CC_FLAGS_FTRACE += -mrecord-mcount 853 export CC_USING_RECORD_MCOUNT := 1 854 endif 855 ifdef CONFIG_HAVE_NOP_MCOUNT 856 ifeq ($(call cc-option-yn, -mnop-mcount),y) 857 CC_FLAGS_FTRACE += -mnop-mcount 858 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 859 endif 860 endif 861endif 862ifdef CONFIG_HAVE_FENTRY 863 ifeq ($(call cc-option-yn, -mfentry),y) 864 CC_FLAGS_FTRACE += -mfentry 865 CC_FLAGS_USING += -DCC_USING_FENTRY 866 endif 867endif 868export CC_FLAGS_FTRACE 869KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 870KBUILD_AFLAGS += $(CC_FLAGS_USING) 871ifdef CONFIG_DYNAMIC_FTRACE 872 ifdef CONFIG_HAVE_C_RECORDMCOUNT 873 BUILD_C_RECORDMCOUNT := y 874 export BUILD_C_RECORDMCOUNT 875 endif 876endif 877endif 878 879# We trigger additional mismatches with less inlining 880ifdef CONFIG_DEBUG_SECTION_MISMATCH 881KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 882endif 883 884ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 885KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 886LDFLAGS_vmlinux += --gc-sections 887endif 888 889ifdef CONFIG_LIVEPATCH 890KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 891endif 892 893ifdef CONFIG_SHADOW_CALL_STACK 894CC_FLAGS_SCS := -fsanitize=shadow-call-stack 895KBUILD_CFLAGS += $(CC_FLAGS_SCS) 896export CC_FLAGS_SCS 897endif 898 899# arch Makefile may override CC so keep this after arch Makefile is included 900NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 901 902# warn about C99 declaration after statement 903KBUILD_CFLAGS += -Wdeclaration-after-statement 904 905# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 906KBUILD_CFLAGS += -Wvla 907 908# disable pointer signed / unsigned warnings in gcc 4.0 909KBUILD_CFLAGS += -Wno-pointer-sign 910 911# disable stringop warnings in gcc 8+ 912KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 913 914# We'll want to enable this eventually, but it's not going away for 5.7 at least 915KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 916KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 917KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 918 919# Another good warning that we'll want to enable eventually 920KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 921 922# Enabled with W=2, disabled by default as noisy 923KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 924 925# disable invalid "can't wrap" optimizations for signed / pointers 926KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 927 928# clang sets -fmerge-all-constants by default as optimization, but this 929# is non-conforming behavior for C and in fact breaks the kernel, so we 930# need to disable it here generally. 931KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 932 933# for gcc -fno-merge-all-constants disables everything, but it is fine 934# to have actual conforming behavior enabled. 935KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 936 937# Make sure -fstack-check isn't enabled (like gentoo apparently did) 938KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 939 940# conserve stack if available 941KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 942 943# Prohibit date/time macros, which would make the build non-deterministic 944KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 945 946# enforce correct pointer usage 947KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 948 949# Require designated initializers for all marked structures 950KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 951 952# change __FILE__ to the relative path from the srctree 953KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 954 955# ensure -fcf-protection is disabled when using retpoline as it is 956# incompatible with -mindirect-branch=thunk-extern 957ifdef CONFIG_RETPOLINE 958KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 959endif 960 961include scripts/Makefile.kasan 962include scripts/Makefile.extrawarn 963include scripts/Makefile.ubsan 964include scripts/Makefile.kcsan 965 966# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 967KBUILD_CPPFLAGS += $(KCPPFLAGS) 968KBUILD_AFLAGS += $(KAFLAGS) 969KBUILD_CFLAGS += $(KCFLAGS) 970 971KBUILD_LDFLAGS_MODULE += --build-id 972LDFLAGS_vmlinux += --build-id 973 974ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 975LDFLAGS_vmlinux += $(call ld-option, -X,) 976endif 977 978ifeq ($(CONFIG_RELR),y) 979LDFLAGS_vmlinux += --pack-dyn-relocs=relr 980endif 981 982# Align the bit size of userspace programs with the kernel 983KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 984KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 985 986# make the checker run with the right architecture 987CHECKFLAGS += --arch=$(ARCH) 988 989# insure the checker run with the right endianness 990CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 991 992# the checker needs the correct machine size 993CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 994 995# Default kernel image to build when no specific target is given. 996# KBUILD_IMAGE may be overruled on the command line or 997# set in the environment 998# Also any assignments in arch/$(ARCH)/Makefile take precedence over 999# this default value 1000export KBUILD_IMAGE ?= vmlinux 1001 1002# 1003# INSTALL_PATH specifies where to place the updated kernel and system map 1004# images. Default is /boot, but you can set it to other values 1005export INSTALL_PATH ?= /boot 1006 1007# 1008# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1009# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1010# an argument if needed. Otherwise it defaults to the kernel install path 1011# 1012export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1013 1014# 1015# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1016# relocations required by build roots. This is not defined in the 1017# makefile but the argument can be passed to make if needed. 1018# 1019 1020MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1021export MODLIB 1022 1023# 1024# INSTALL_MOD_STRIP, if defined, will cause modules to be 1025# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1026# the default option --strip-debug will be used. Otherwise, 1027# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1028 1029ifdef INSTALL_MOD_STRIP 1030ifeq ($(INSTALL_MOD_STRIP),1) 1031mod_strip_cmd = $(STRIP) --strip-debug 1032else 1033mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1034endif # INSTALL_MOD_STRIP=1 1035else 1036mod_strip_cmd = true 1037endif # INSTALL_MOD_STRIP 1038export mod_strip_cmd 1039 1040# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1041# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1042# or CONFIG_MODULE_COMPRESS_XZ. 1043 1044mod_compress_cmd = true 1045ifdef CONFIG_MODULE_COMPRESS 1046 ifdef CONFIG_MODULE_COMPRESS_GZIP 1047 mod_compress_cmd = $(KGZIP) -n -f 1048 endif # CONFIG_MODULE_COMPRESS_GZIP 1049 ifdef CONFIG_MODULE_COMPRESS_XZ 1050 mod_compress_cmd = $(XZ) -f 1051 endif # CONFIG_MODULE_COMPRESS_XZ 1052endif # CONFIG_MODULE_COMPRESS 1053export mod_compress_cmd 1054 1055ifdef CONFIG_MODULE_SIG_ALL 1056$(eval $(call config_filename,MODULE_SIG_KEY)) 1057 1058mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1059else 1060mod_sign_cmd = true 1061endif 1062export mod_sign_cmd 1063 1064HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1065 1066ifdef CONFIG_STACK_VALIDATION 1067 has_libelf := $(call try-run,\ 1068 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1069 ifeq ($(has_libelf),1) 1070 objtool_target := tools/objtool FORCE 1071 else 1072 SKIP_STACK_VALIDATION := 1 1073 export SKIP_STACK_VALIDATION 1074 endif 1075endif 1076 1077PHONY += prepare0 1078 1079export MODORDER := $(extmod-prefix)modules.order 1080export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1081 1082ifeq ($(KBUILD_EXTMOD),) 1083core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1084 1085vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1086 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1087 $(libs-y) $(libs-m))) 1088 1089vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1090 $(patsubst %/,%,$(filter %/, $(core-) \ 1091 $(drivers-) $(libs-)))) 1092 1093subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1094 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1095 $(drivers-y) $(drivers-m))) 1096 1097build-dirs := $(vmlinux-dirs) 1098clean-dirs := $(vmlinux-alldirs) 1099 1100# Externally visible symbols (used by link-vmlinux.sh) 1101KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1102KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1103ifdef CONFIG_MODULES 1104KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1105KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1106else 1107KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1108endif 1109KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1110 1111export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1112export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1113export LDFLAGS_vmlinux 1114# used by scripts/Makefile.package 1115export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1116 1117vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1118 1119# Recurse until adjust_autoksyms.sh is satisfied 1120PHONY += autoksyms_recursive 1121ifdef CONFIG_TRIM_UNUSED_KSYMS 1122# For the kernel to actually contain only the needed exported symbols, 1123# we have to build modules as well to determine what those symbols are. 1124# (this can be evaluated only once include/config/auto.conf has been included) 1125KBUILD_MODULES := 1 1126 1127autoksyms_recursive: descend modules.order 1128 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1129 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1130endif 1131 1132autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1133 1134quiet_cmd_autoksyms_h = GEN $@ 1135 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1136 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1137 1138$(autoksyms_h): 1139 $(call cmd,autoksyms_h) 1140 1141ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1142 1143# Final link of vmlinux with optional arch pass after final link 1144cmd_link-vmlinux = \ 1145 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1146 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1147 1148vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1149 +$(call if_changed,link-vmlinux) 1150 1151targets := vmlinux 1152 1153# The actual objects are generated when descending, 1154# make sure no implicit rule kicks in 1155$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1156 1157filechk_kernel.release = \ 1158 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1159 1160# Store (new) KERNELRELEASE string in include/config/kernel.release 1161include/config/kernel.release: FORCE 1162 $(call filechk,kernel.release) 1163 1164# Additional helpers built in scripts/ 1165# Carefully list dependencies so we do not try to build scripts twice 1166# in parallel 1167PHONY += scripts 1168scripts: scripts_basic scripts_dtc 1169 $(Q)$(MAKE) $(build)=$(@) 1170 1171# Things we need to do before we recursively start building the kernel 1172# or the modules are listed in "prepare". 1173# A multi level approach is used. prepareN is processed before prepareN-1. 1174# archprepare is used in arch Makefiles and when processed asm symlink, 1175# version.h and scripts_basic is processed / created. 1176 1177PHONY += prepare archprepare 1178 1179archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1180 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1181 include/generated/autoconf.h 1182 1183prepare0: archprepare 1184 $(Q)$(MAKE) $(build)=scripts/mod 1185 $(Q)$(MAKE) $(build)=. 1186 1187# All the preparing.. 1188prepare: prepare0 prepare-objtool 1189 1190# Support for using generic headers in asm-generic 1191asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1192 1193PHONY += asm-generic uapi-asm-generic 1194asm-generic: uapi-asm-generic 1195 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1196 generic=include/asm-generic 1197uapi-asm-generic: 1198 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1199 generic=include/uapi/asm-generic 1200 1201PHONY += prepare-objtool 1202prepare-objtool: $(objtool_target) 1203ifeq ($(SKIP_STACK_VALIDATION),1) 1204ifdef CONFIG_UNWINDER_ORC 1205 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1206 @false 1207else 1208 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1209endif 1210endif 1211 1212# Generate some files 1213# --------------------------------------------------------------------------- 1214 1215# KERNELRELEASE can change from a few different places, meaning version.h 1216# needs to be updated, so this check is forced on all builds 1217 1218uts_len := 64 1219define filechk_utsrelease.h 1220 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1221 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1222 exit 1; \ 1223 fi; \ 1224 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1225endef 1226 1227define filechk_version.h 1228 echo \#define LINUX_VERSION_CODE $(shell \ 1229 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1230 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1231endef 1232 1233$(version_h): FORCE 1234 $(call filechk,version.h) 1235 $(Q)rm -f $(old_version_h) 1236 1237include/generated/utsrelease.h: include/config/kernel.release FORCE 1238 $(call filechk,utsrelease.h) 1239 1240PHONY += headerdep 1241headerdep: 1242 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1243 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1244 1245# --------------------------------------------------------------------------- 1246# Kernel headers 1247 1248#Default location for installed headers 1249export INSTALL_HDR_PATH = $(objtree)/usr 1250 1251quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1252 cmd_headers_install = \ 1253 mkdir -p $(INSTALL_HDR_PATH); \ 1254 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1255 usr/include $(INSTALL_HDR_PATH) 1256 1257PHONY += headers_install 1258headers_install: headers 1259 $(call cmd,headers_install) 1260 1261PHONY += archheaders archscripts 1262 1263hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1264 1265PHONY += headers 1266headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1267 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1268 $(error Headers not exportable for the $(SRCARCH) architecture)) 1269 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1270 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1271 1272# Deprecated. It is no-op now. 1273PHONY += headers_check 1274headers_check: 1275 @: 1276 1277ifdef CONFIG_HEADERS_INSTALL 1278prepare: headers 1279endif 1280 1281PHONY += scripts_unifdef 1282scripts_unifdef: scripts_basic 1283 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1284 1285# --------------------------------------------------------------------------- 1286# Kernel selftest 1287 1288PHONY += kselftest 1289kselftest: 1290 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1291 1292kselftest-%: FORCE 1293 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1294 1295PHONY += kselftest-merge 1296kselftest-merge: 1297 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1298 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1299 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1300 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1301 1302# --------------------------------------------------------------------------- 1303# Devicetree files 1304 1305ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1306dtstree := arch/$(SRCARCH)/boot/dts 1307endif 1308 1309ifneq ($(dtstree),) 1310 1311%.dtb: include/config/kernel.release scripts_dtc 1312 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1313 1314PHONY += dtbs dtbs_install dtbs_check 1315dtbs: include/config/kernel.release scripts_dtc 1316 $(Q)$(MAKE) $(build)=$(dtstree) 1317 1318ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1319export CHECK_DTBS=y 1320dtbs: dt_binding_check 1321endif 1322 1323dtbs_check: dtbs 1324 1325dtbs_install: 1326 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1327 1328ifdef CONFIG_OF_EARLY_FLATTREE 1329all: dtbs 1330endif 1331 1332endif 1333 1334PHONY += scripts_dtc 1335scripts_dtc: scripts_basic 1336 $(Q)$(MAKE) $(build)=scripts/dtc 1337 1338ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1339export CHECK_DT_BINDING=y 1340endif 1341 1342PHONY += dt_binding_check 1343dt_binding_check: scripts_dtc 1344 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1345 1346# --------------------------------------------------------------------------- 1347# Modules 1348 1349ifdef CONFIG_MODULES 1350 1351# By default, build modules as well 1352 1353all: modules 1354 1355# When we're building modules with modversions, we need to consider 1356# the built-in objects during the descend as well, in order to 1357# make sure the checksums are up to date before we record them. 1358ifdef CONFIG_MODVERSIONS 1359 KBUILD_BUILTIN := 1 1360endif 1361 1362# Build modules 1363# 1364# A module can be listed more than once in obj-m resulting in 1365# duplicate lines in modules.order files. Those are removed 1366# using awk while concatenating to the final file. 1367 1368PHONY += modules 1369modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1370 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1371 1372PHONY += modules_check 1373modules_check: modules.order 1374 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1375 1376cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1377 1378modules.order: $(subdir-modorder) FORCE 1379 $(call if_changed,modules_order) 1380 1381targets += modules.order 1382 1383# Target to prepare building external modules 1384PHONY += modules_prepare 1385modules_prepare: prepare 1386 1387# Target to install modules 1388PHONY += modules_install 1389modules_install: _modinst_ _modinst_post 1390 1391PHONY += _modinst_ 1392_modinst_: 1393 @rm -rf $(MODLIB)/kernel 1394 @rm -f $(MODLIB)/source 1395 @mkdir -p $(MODLIB)/kernel 1396 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1397 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1398 rm -f $(MODLIB)/build ; \ 1399 ln -s $(CURDIR) $(MODLIB)/build ; \ 1400 fi 1401 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1402 @cp -f modules.builtin $(MODLIB)/ 1403 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1404 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1405 1406# This depmod is only for convenience to give the initial 1407# boot a modules.dep even before / is mounted read-write. However the 1408# boot script depmod is the master version. 1409PHONY += _modinst_post 1410_modinst_post: _modinst_ 1411 $(call cmd,depmod) 1412 1413ifeq ($(CONFIG_MODULE_SIG), y) 1414PHONY += modules_sign 1415modules_sign: 1416 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1417endif 1418 1419else # CONFIG_MODULES 1420 1421# Modules not configured 1422# --------------------------------------------------------------------------- 1423 1424PHONY += modules modules_install 1425modules modules_install: 1426 @echo >&2 1427 @echo >&2 "The present kernel configuration has modules disabled." 1428 @echo >&2 "Type 'make config' and enable loadable module support." 1429 @echo >&2 "Then build a kernel with module support enabled." 1430 @echo >&2 1431 @exit 1 1432 1433endif # CONFIG_MODULES 1434 1435### 1436# Cleaning is done on three levels. 1437# make clean Delete most generated files 1438# Leave enough to build external modules 1439# make mrproper Delete the current configuration, and all generated files 1440# make distclean Remove editor backup files, patch leftover files and the like 1441 1442# Directories & files removed with 'make clean' 1443CLEAN_FILES += include/ksym vmlinux.symvers \ 1444 modules.builtin modules.builtin.modinfo modules.nsdeps 1445 1446# Directories & files removed with 'make mrproper' 1447MRPROPER_FILES += include/config include/generated \ 1448 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1449 debian snap tar-install \ 1450 .config .config.old .version \ 1451 Module.symvers \ 1452 signing_key.pem signing_key.priv signing_key.x509 \ 1453 x509.genkey extra_certificates signing_key.x509.keyid \ 1454 signing_key.x509.signer vmlinux-gdb.py \ 1455 *.spec 1456 1457# Directories & files removed with 'make distclean' 1458DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1459 1460# clean - Delete most, but leave enough to build external modules 1461# 1462clean: rm-files := $(CLEAN_FILES) 1463 1464PHONY += archclean vmlinuxclean 1465 1466vmlinuxclean: 1467 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1468 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1469 1470clean: archclean vmlinuxclean 1471 1472# mrproper - Delete all generated files, including .config 1473# 1474mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1475mrproper-dirs := $(addprefix _mrproper_,scripts) 1476 1477PHONY += $(mrproper-dirs) mrproper 1478$(mrproper-dirs): 1479 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1480 1481mrproper: clean $(mrproper-dirs) 1482 $(call cmd,rmfiles) 1483 1484# distclean 1485# 1486distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1487 1488PHONY += distclean 1489 1490distclean: mrproper 1491 $(call cmd,rmfiles) 1492 @find $(srctree) $(RCS_FIND_IGNORE) \ 1493 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1494 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1495 -o -name 'core' \) \ 1496 -type f -print | xargs rm -f 1497 1498 1499# Packaging of the kernel to various formats 1500# --------------------------------------------------------------------------- 1501 1502%src-pkg: FORCE 1503 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1504%pkg: include/config/kernel.release FORCE 1505 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1506 1507# Brief documentation of the typical targets used 1508# --------------------------------------------------------------------------- 1509 1510boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1511boards := $(sort $(notdir $(boards))) 1512board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1513board-dirs := $(sort $(notdir $(board-dirs:/=))) 1514 1515PHONY += help 1516help: 1517 @echo 'Cleaning targets:' 1518 @echo ' clean - Remove most generated files but keep the config and' 1519 @echo ' enough build support to build external modules' 1520 @echo ' mrproper - Remove all generated files + config + various backup files' 1521 @echo ' distclean - mrproper + remove editor backup and patch files' 1522 @echo '' 1523 @echo 'Configuration targets:' 1524 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1525 @echo '' 1526 @echo 'Other generic targets:' 1527 @echo ' all - Build all targets marked with [*]' 1528 @echo '* vmlinux - Build the bare kernel' 1529 @echo '* modules - Build all modules' 1530 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1531 @echo ' dir/ - Build all files in dir and below' 1532 @echo ' dir/file.[ois] - Build specified target only' 1533 @echo ' dir/file.ll - Build the LLVM assembly file' 1534 @echo ' (requires compiler support for LLVM assembly generation)' 1535 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1536 @echo ' (requires a recent binutils and recent build (System.map))' 1537 @echo ' dir/file.ko - Build module including final link' 1538 @echo ' modules_prepare - Set up for building external modules' 1539 @echo ' tags/TAGS - Generate tags file for editors' 1540 @echo ' cscope - Generate cscope index' 1541 @echo ' gtags - Generate GNU GLOBAL index' 1542 @echo ' kernelrelease - Output the release version string (use with make -s)' 1543 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1544 @echo ' image_name - Output the image name (use with make -s)' 1545 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1546 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1547 echo '' 1548 @echo 'Static analysers:' 1549 @echo ' checkstack - Generate a list of stack hogs' 1550 @echo ' namespacecheck - Name space analysis on compiled kernel' 1551 @echo ' versioncheck - Sanity check on version.h usage' 1552 @echo ' includecheck - Check for duplicate included header files' 1553 @echo ' export_report - List the usages of all exported symbols' 1554 @echo ' headerdep - Detect inclusion cycles in headers' 1555 @echo ' coccicheck - Check with Coccinelle' 1556 @echo '' 1557 @echo 'Tools:' 1558 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1559 @echo '' 1560 @echo 'Kernel selftest:' 1561 @echo ' kselftest - Build and run kernel selftest' 1562 @echo ' Build, install, and boot kernel before' 1563 @echo ' running kselftest on it' 1564 @echo ' Run as root for full coverage' 1565 @echo ' kselftest-all - Build kernel selftest' 1566 @echo ' kselftest-install - Build and install kernel selftest' 1567 @echo ' kselftest-clean - Remove all generated kselftest files' 1568 @echo ' kselftest-merge - Merge all the config dependencies of' 1569 @echo ' kselftest to existing .config.' 1570 @echo '' 1571 @$(if $(dtstree), \ 1572 echo 'Devicetree:'; \ 1573 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1574 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1575 echo ' dt_binding_check - Validate device tree binding documents'; \ 1576 echo ' dtbs_check - Validate device tree source files';\ 1577 echo '') 1578 1579 @echo 'Userspace tools targets:' 1580 @echo ' use "make tools/help"' 1581 @echo ' or "cd tools; make help"' 1582 @echo '' 1583 @echo 'Kernel packaging:' 1584 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1585 @echo '' 1586 @echo 'Documentation targets:' 1587 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1588 @echo '' 1589 @echo 'Architecture specific targets ($(SRCARCH)):' 1590 @$(if $(archhelp),$(archhelp),\ 1591 echo ' No architecture specific help defined for $(SRCARCH)') 1592 @echo '' 1593 @$(if $(boards), \ 1594 $(foreach b, $(boards), \ 1595 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1596 echo '') 1597 @$(if $(board-dirs), \ 1598 $(foreach b, $(board-dirs), \ 1599 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1600 printf " %-16s - Show all of the above\\n" help-boards; \ 1601 echo '') 1602 1603 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1604 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1605 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1606 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1607 @echo ' (sparse by default)' 1608 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1609 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1610 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1611 @echo ' 1: warnings which may be relevant and do not occur too often' 1612 @echo ' 2: warnings which occur quite often but may still be relevant' 1613 @echo ' 3: more obscure warnings, can most likely be ignored' 1614 @echo ' Multiple levels can be combined with W=12 or W=123' 1615 @echo '' 1616 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1617 @echo 'For further info see the ./README file' 1618 1619 1620help-board-dirs := $(addprefix help-,$(board-dirs)) 1621 1622help-boards: $(help-board-dirs) 1623 1624boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1625 1626$(help-board-dirs): help-%: 1627 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1628 @$(if $(boards-per-dir), \ 1629 $(foreach b, $(boards-per-dir), \ 1630 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1631 echo '') 1632 1633 1634# Documentation targets 1635# --------------------------------------------------------------------------- 1636DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1637 linkcheckdocs dochelp refcheckdocs 1638PHONY += $(DOC_TARGETS) 1639$(DOC_TARGETS): 1640 $(Q)$(MAKE) $(build)=Documentation $@ 1641 1642# Misc 1643# --------------------------------------------------------------------------- 1644 1645PHONY += scripts_gdb 1646scripts_gdb: prepare0 1647 $(Q)$(MAKE) $(build)=scripts/gdb 1648 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1649 1650ifdef CONFIG_GDB_SCRIPTS 1651all: scripts_gdb 1652endif 1653 1654else # KBUILD_EXTMOD 1655 1656### 1657# External module support. 1658# When building external modules the kernel used as basis is considered 1659# read-only, and no consistency checks are made and the make 1660# system is not used on the basis kernel. If updates are required 1661# in the basis kernel ordinary make commands (without M=...) must 1662# be used. 1663# 1664# The following are the only valid targets when building external 1665# modules. 1666# make M=dir clean Delete all automatically generated files 1667# make M=dir modules Make all modules in specified dir 1668# make M=dir Same as 'make M=dir modules' 1669# make M=dir modules_install 1670# Install the modules built in the module directory 1671# Assumes install directory is already created 1672 1673# We are always building modules 1674KBUILD_MODULES := 1 1675 1676build-dirs := $(KBUILD_EXTMOD) 1677PHONY += modules 1678modules: descend 1679 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1680 1681PHONY += modules_install 1682modules_install: _emodinst_ _emodinst_post 1683 1684install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1685PHONY += _emodinst_ 1686_emodinst_: 1687 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1688 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1689 1690PHONY += _emodinst_post 1691_emodinst_post: _emodinst_ 1692 $(call cmd,depmod) 1693 1694clean-dirs := $(KBUILD_EXTMOD) 1695clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1696 1697PHONY += help 1698help: 1699 @echo ' Building external modules.' 1700 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1701 @echo '' 1702 @echo ' modules - default target, build the module(s)' 1703 @echo ' modules_install - install the module' 1704 @echo ' clean - remove generated files in module directory only' 1705 @echo '' 1706 1707PHONY += prepare 1708endif # KBUILD_EXTMOD 1709 1710# Single targets 1711# --------------------------------------------------------------------------- 1712# To build individual files in subdirectories, you can do like this: 1713# 1714# make foo/bar/baz.s 1715# 1716# The supported suffixes for single-target are listed in 'single-targets' 1717# 1718# To build only under specific subdirectories, you can do like this: 1719# 1720# make foo/bar/baz/ 1721 1722ifdef single-build 1723 1724# .ko is special because modpost is needed 1725single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1726single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1727 1728$(single-ko): single_modpost 1729 @: 1730$(single-no-ko): descend 1731 @: 1732 1733ifeq ($(KBUILD_EXTMOD),) 1734# For the single build of in-tree modules, use a temporary file to avoid 1735# the situation of modules_install installing an invalid modules.order. 1736MODORDER := .modules.tmp 1737endif 1738 1739PHONY += single_modpost 1740single_modpost: $(single-no-ko) 1741 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1742 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1743 1744KBUILD_MODULES := 1 1745 1746export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1747 1748# trim unrelated directories 1749build-dirs := $(foreach d, $(build-dirs), \ 1750 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1751 1752endif 1753 1754ifndef CONFIG_MODULES 1755KBUILD_MODULES := 1756endif 1757 1758# Handle descending into subdirectories listed in $(build-dirs) 1759# Preset locale variables to speed up the build process. Limit locale 1760# tweaks to this spot to avoid wrong language settings when running 1761# make menuconfig etc. 1762# Error messages still appears in the original language 1763PHONY += descend $(build-dirs) 1764descend: $(build-dirs) 1765$(build-dirs): prepare 1766 $(Q)$(MAKE) $(build)=$@ \ 1767 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1768 need-builtin=1 need-modorder=1 1769 1770clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1771PHONY += $(clean-dirs) clean 1772$(clean-dirs): 1773 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1774 1775clean: $(clean-dirs) 1776 $(call cmd,rmfiles) 1777 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1778 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1779 -o -name '*.ko.*' \ 1780 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1781 -o -name '*.dwo' -o -name '*.lst' \ 1782 -o -name '*.su' -o -name '*.mod' \ 1783 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1784 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1785 -o -name '*.asn1.[ch]' \ 1786 -o -name '*.symtypes' -o -name 'modules.order' \ 1787 -o -name '.tmp_*.o.*' \ 1788 -o -name '*.c.[012]*.*' \ 1789 -o -name '*.ll' \ 1790 -o -name '*.gcno' \) -type f -print | xargs rm -f 1791 1792# Generate tags for editors 1793# --------------------------------------------------------------------------- 1794quiet_cmd_tags = GEN $@ 1795 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1796 1797tags TAGS cscope gtags: FORCE 1798 $(call cmd,tags) 1799 1800# Script to generate missing namespace dependencies 1801# --------------------------------------------------------------------------- 1802 1803PHONY += nsdeps 1804nsdeps: export KBUILD_NSDEPS=1 1805nsdeps: modules 1806 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1807 1808# Scripts to check various things for consistency 1809# --------------------------------------------------------------------------- 1810 1811PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1812 1813includecheck: 1814 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1815 -name '*.[hcS]' -type f -print | sort \ 1816 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1817 1818versioncheck: 1819 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1820 -name '*.[hcS]' -type f -print | sort \ 1821 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1822 1823coccicheck: 1824 $(Q)$(BASH) $(srctree)/scripts/$@ 1825 1826namespacecheck: 1827 $(PERL) $(srctree)/scripts/namespace.pl 1828 1829export_report: 1830 $(PERL) $(srctree)/scripts/export_report.pl 1831 1832PHONY += checkstack kernelrelease kernelversion image_name 1833 1834# UML needs a little special treatment here. It wants to use the host 1835# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1836# else wants $(ARCH), including people doing cross-builds, which means 1837# that $(SUBARCH) doesn't work here. 1838ifeq ($(ARCH), um) 1839CHECKSTACK_ARCH := $(SUBARCH) 1840else 1841CHECKSTACK_ARCH := $(ARCH) 1842endif 1843checkstack: 1844 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1845 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1846 1847kernelrelease: 1848 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1849 1850kernelversion: 1851 @echo $(KERNELVERSION) 1852 1853image_name: 1854 @echo $(KBUILD_IMAGE) 1855 1856# Clear a bunch of variables before executing the submake 1857 1858ifeq ($(quiet),silent_) 1859tools_silent=s 1860endif 1861 1862tools/: FORCE 1863 $(Q)mkdir -p $(objtree)/tools 1864 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1865 1866tools/%: FORCE 1867 $(Q)mkdir -p $(objtree)/tools 1868 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1869 1870quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1871 cmd_rmfiles = rm -rf $(rm-files) 1872 1873# Run depmod only if we have System.map and depmod is executable 1874quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1875 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1876 $(KERNELRELEASE) 1877 1878# read saved command lines for existing targets 1879existing-targets := $(wildcard $(sort $(targets))) 1880 1881-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1882 1883endif # config-build 1884endif # mixed-build 1885endif # need-sub-make 1886 1887PHONY += FORCE 1888FORCE: 1889 1890# Declare the contents of the PHONY variable as phony. We keep that 1891# information in a variable so we can use it in if_changed and friends. 1892.PHONY: $(PHONY) 1893