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 451RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 452LEX = flex 453YACC = bison 454AWK = awk 455INSTALLKERNEL := installkernel 456DEPMOD = /sbin/depmod 457PERL = perl 458PYTHON = python 459PYTHON3 = python3 460CHECK = sparse 461BASH = bash 462KGZIP = gzip 463KBZIP2 = bzip2 464KLZOP = lzop 465LZMA = lzma 466LZ4 = lz4c 467XZ = xz 468ZSTD = zstd 469 470CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 471 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 472NOSTDINC_FLAGS := 473CFLAGS_MODULE = 474AFLAGS_MODULE = 475LDFLAGS_MODULE = 476CFLAGS_KERNEL = 477AFLAGS_KERNEL = 478LDFLAGS_vmlinux = 479 480# Use USERINCLUDE when you must reference the UAPI directories only. 481USERINCLUDE := \ 482 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 483 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 484 -I$(srctree)/include/uapi \ 485 -I$(objtree)/include/generated/uapi \ 486 -include $(srctree)/include/linux/kconfig.h 487 488# Use LINUXINCLUDE when you must reference the include/ directory. 489# Needed to be compatible with the O= option 490LINUXINCLUDE := \ 491 -I$(srctree)/arch/$(SRCARCH)/include \ 492 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 493 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 494 -I$(objtree)/include \ 495 $(USERINCLUDE) 496 497KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 498KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 499 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 500 -Werror=implicit-function-declaration -Werror=implicit-int \ 501 -Wno-format-security \ 502 -std=gnu89 503KBUILD_CPPFLAGS := -D__KERNEL__ 504KBUILD_AFLAGS_KERNEL := 505KBUILD_CFLAGS_KERNEL := 506KBUILD_AFLAGS_MODULE := -DMODULE 507KBUILD_CFLAGS_MODULE := -DMODULE 508KBUILD_LDFLAGS_MODULE := 509export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 510KBUILD_LDFLAGS := 511GCC_PLUGINS_CFLAGS := 512CLANG_FLAGS := 513 514export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 515export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 516export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 517export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 518export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 519 520export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 521export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 522export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN 523export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 524export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 525export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 526 527# Files to ignore in find ... statements 528 529export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 530 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 531 -prune -o 532export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 533 --exclude CVS --exclude .pc --exclude .hg --exclude .git 534 535# =========================================================================== 536# Rules shared between *config targets and build targets 537 538# Basic helpers built in scripts/basic/ 539PHONY += scripts_basic 540scripts_basic: 541 $(Q)$(MAKE) $(build)=scripts/basic 542 $(Q)rm -f .tmp_quiet_recordmcount 543 544PHONY += outputmakefile 545# Before starting out-of-tree build, make sure the source tree is clean. 546# outputmakefile generates a Makefile in the output directory, if using a 547# separate output directory. This allows convenient use of make in the 548# output directory. 549# At the same time when output Makefile generated, generate .gitignore to 550# ignore whole output directory 551outputmakefile: 552ifdef building_out_of_srctree 553 $(Q)if [ -f $(srctree)/.config -o \ 554 -d $(srctree)/include/config -o \ 555 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 556 echo >&2 "***"; \ 557 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 558 echo >&2 "*** in $(abs_srctree)";\ 559 echo >&2 "***"; \ 560 false; \ 561 fi 562 $(Q)ln -fsn $(srctree) source 563 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 564 $(Q)test -e .gitignore || \ 565 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 566endif 567 568ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 569ifneq ($(CROSS_COMPILE),) 570CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 571GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 572CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 573GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 574endif 575ifneq ($(GCC_TOOLCHAIN),) 576CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 577endif 578ifneq ($(LLVM_IAS),1) 579CLANG_FLAGS += -no-integrated-as 580endif 581CLANG_FLAGS += -Werror=unknown-warning-option 582KBUILD_CFLAGS += $(CLANG_FLAGS) 583KBUILD_AFLAGS += $(CLANG_FLAGS) 584export CLANG_FLAGS 585endif 586 587# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 588# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 589# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 590# and from include/config/auto.conf.cmd to detect the compiler upgrade. 591CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 592 593ifdef config-build 594# =========================================================================== 595# *config targets only - make sure prerequisites are updated, and descend 596# in scripts/kconfig to make the *config target 597 598# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 599# KBUILD_DEFCONFIG may point out an alternative default configuration 600# used for 'make defconfig' 601include arch/$(SRCARCH)/Makefile 602export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 603 604config: outputmakefile scripts_basic FORCE 605 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 606 607%config: outputmakefile scripts_basic FORCE 608 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 609 610else #!config-build 611# =========================================================================== 612# Build targets only - this includes vmlinux, arch specific targets, clean 613# targets and others. In general all targets except *config targets. 614 615# If building an external module we do not care about the all: rule 616# but instead __all depend on modules 617PHONY += all 618ifeq ($(KBUILD_EXTMOD),) 619__all: all 620else 621__all: modules 622endif 623 624# Decide whether to build built-in, modular, or both. 625# Normally, just do built-in. 626 627KBUILD_MODULES := 628KBUILD_BUILTIN := 1 629 630# If we have only "make modules", don't compile built-in objects. 631ifeq ($(MAKECMDGOALS),modules) 632 KBUILD_BUILTIN := 633endif 634 635# If we have "make <whatever> modules", compile modules 636# in addition to whatever we do anyway. 637# Just "make" or "make all" shall build modules as well 638 639ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 640 KBUILD_MODULES := 1 641endif 642 643ifeq ($(MAKECMDGOALS),) 644 KBUILD_MODULES := 1 645endif 646 647export KBUILD_MODULES KBUILD_BUILTIN 648 649ifdef need-config 650include include/config/auto.conf 651endif 652 653ifeq ($(KBUILD_EXTMOD),) 654# Objects we will link into vmlinux / subdirs we need to visit 655core-y := init/ usr/ 656drivers-y := drivers/ sound/ 657drivers-$(CONFIG_SAMPLES) += samples/ 658drivers-y += net/ virt/ 659libs-y := lib/ 660endif # KBUILD_EXTMOD 661 662# The all: target is the default when no target is given on the 663# command line. 664# This allow a user to issue only 'make' to build a kernel including modules 665# Defaults to vmlinux, but the arch makefile usually adds further targets 666all: vmlinux 667 668CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 669 $(call cc-option,-fno-tree-loop-im) \ 670 $(call cc-disable-warning,maybe-uninitialized,) 671export CFLAGS_GCOV 672 673# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 674ifdef CONFIG_FUNCTION_TRACER 675 CC_FLAGS_FTRACE := -pg 676endif 677 678RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 679RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 680RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 681RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 682RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 683RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 684export RETPOLINE_CFLAGS 685export RETPOLINE_VDSO_CFLAGS 686 687include arch/$(SRCARCH)/Makefile 688 689ifdef need-config 690ifdef may-sync-config 691# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 692# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 693# because some architectures define CROSS_COMPILE there. 694include include/config/auto.conf.cmd 695 696$(KCONFIG_CONFIG): 697 @echo >&2 '***' 698 @echo >&2 '*** Configuration file "$@" not found!' 699 @echo >&2 '***' 700 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 701 @echo >&2 '*** "make menuconfig" or "make xconfig").' 702 @echo >&2 '***' 703 @/bin/false 704 705# The actual configuration files used during the build are stored in 706# include/generated/ and include/config/. Update them if .config is newer than 707# include/config/auto.conf (which mirrors .config). 708# 709# This exploits the 'multi-target pattern rule' trick. 710# The syncconfig should be executed only once to make all the targets. 711# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 712%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 713 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 714else # !may-sync-config 715# External modules and some install targets need include/generated/autoconf.h 716# and include/config/auto.conf but do not care if they are up-to-date. 717# Use auto.conf to trigger the test 718PHONY += include/config/auto.conf 719 720include/config/auto.conf: 721 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 722 echo >&2; \ 723 echo >&2 " ERROR: Kernel configuration is invalid."; \ 724 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 725 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 726 echo >&2 ; \ 727 /bin/false) 728 729endif # may-sync-config 730endif # need-config 731 732KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 733KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 734KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 735KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 736KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 737 738ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 739KBUILD_CFLAGS += -O2 740else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 741KBUILD_CFLAGS += -O3 742else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 743KBUILD_CFLAGS += -Os 744endif 745 746# Tell gcc to never replace conditional load with a non-conditional one 747KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 748KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 749 750include scripts/Makefile.kcov 751include scripts/Makefile.gcc-plugins 752 753ifdef CONFIG_READABLE_ASM 754# Disable optimizations that make assembler listings hard to read. 755# reorder blocks reorders the control in the function 756# ipa clone creates specialized cloned functions 757# partial inlining inlines only parts of functions 758KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 759 $(call cc-option,-fno-ipa-cp-clone,) \ 760 $(call cc-option,-fno-partial-inlining) 761endif 762 763ifneq ($(CONFIG_FRAME_WARN),0) 764KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 765endif 766 767stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 768stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 769stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 770 771KBUILD_CFLAGS += $(stackp-flags-y) 772 773ifdef CONFIG_CC_IS_CLANG 774KBUILD_CPPFLAGS += -Qunused-arguments 775KBUILD_CFLAGS += -Wno-format-invalid-specifier 776KBUILD_CFLAGS += -Wno-gnu 777# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 778# source of a reference will be _MergedGlobals and not on of the whitelisted names. 779# See modpost pattern 2 780KBUILD_CFLAGS += -mno-global-merge 781else 782 783# These warnings generated too much noise in a regular build. 784# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 785KBUILD_CFLAGS += -Wno-unused-but-set-variable 786 787# Warn about unmarked fall-throughs in switch statement. 788# Disabled for clang while comment to attribute conversion happens and 789# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 790KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 791endif 792 793KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 794ifdef CONFIG_FRAME_POINTER 795KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 796else 797# Some targets (ARM with Thumb2, for example), can't be built with frame 798# pointers. For those, we don't have FUNCTION_TRACER automatically 799# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 800# incompatible with -fomit-frame-pointer with current GCC, so we don't use 801# -fomit-frame-pointer with FUNCTION_TRACER. 802ifndef CONFIG_FUNCTION_TRACER 803KBUILD_CFLAGS += -fomit-frame-pointer 804endif 805endif 806 807# Initialize all stack variables with a 0xAA pattern. 808ifdef CONFIG_INIT_STACK_ALL_PATTERN 809KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 810endif 811 812# Initialize all stack variables with a zero value. 813ifdef CONFIG_INIT_STACK_ALL_ZERO 814# Future support for zero initialization is still being debated, see 815# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 816# renamed or dropped. 817KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 818KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 819endif 820 821DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 822 823ifdef CONFIG_DEBUG_INFO 824ifdef CONFIG_DEBUG_INFO_SPLIT 825DEBUG_CFLAGS += -gsplit-dwarf 826else 827DEBUG_CFLAGS += -g 828endif 829KBUILD_AFLAGS += -Wa,-gdwarf-2 830endif 831ifdef CONFIG_DEBUG_INFO_DWARF4 832DEBUG_CFLAGS += -gdwarf-4 833endif 834 835ifdef CONFIG_DEBUG_INFO_REDUCED 836DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 837 $(call cc-option,-fno-var-tracking) 838endif 839 840ifdef CONFIG_DEBUG_INFO_COMPRESSED 841DEBUG_CFLAGS += -gz=zlib 842KBUILD_AFLAGS += -gz=zlib 843KBUILD_LDFLAGS += --compress-debug-sections=zlib 844endif 845 846KBUILD_CFLAGS += $(DEBUG_CFLAGS) 847export DEBUG_CFLAGS 848 849ifdef CONFIG_FUNCTION_TRACER 850ifdef CONFIG_FTRACE_MCOUNT_RECORD 851 # gcc 5 supports generating the mcount tables directly 852 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 853 CC_FLAGS_FTRACE += -mrecord-mcount 854 export CC_USING_RECORD_MCOUNT := 1 855 endif 856 ifdef CONFIG_HAVE_NOP_MCOUNT 857 ifeq ($(call cc-option-yn, -mnop-mcount),y) 858 CC_FLAGS_FTRACE += -mnop-mcount 859 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 860 endif 861 endif 862endif 863ifdef CONFIG_HAVE_FENTRY 864 ifeq ($(call cc-option-yn, -mfentry),y) 865 CC_FLAGS_FTRACE += -mfentry 866 CC_FLAGS_USING += -DCC_USING_FENTRY 867 endif 868endif 869export CC_FLAGS_FTRACE 870KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 871KBUILD_AFLAGS += $(CC_FLAGS_USING) 872ifdef CONFIG_DYNAMIC_FTRACE 873 ifdef CONFIG_HAVE_C_RECORDMCOUNT 874 BUILD_C_RECORDMCOUNT := y 875 export BUILD_C_RECORDMCOUNT 876 endif 877endif 878endif 879 880# We trigger additional mismatches with less inlining 881ifdef CONFIG_DEBUG_SECTION_MISMATCH 882KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 883endif 884 885ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 886KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 887LDFLAGS_vmlinux += --gc-sections 888endif 889 890ifdef CONFIG_LIVEPATCH 891KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 892endif 893 894ifdef CONFIG_SHADOW_CALL_STACK 895CC_FLAGS_SCS := -fsanitize=shadow-call-stack 896KBUILD_CFLAGS += $(CC_FLAGS_SCS) 897export CC_FLAGS_SCS 898endif 899 900# arch Makefile may override CC so keep this after arch Makefile is included 901NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 902 903# warn about C99 declaration after statement 904KBUILD_CFLAGS += -Wdeclaration-after-statement 905 906# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 907KBUILD_CFLAGS += -Wvla 908 909# disable pointer signed / unsigned warnings in gcc 4.0 910KBUILD_CFLAGS += -Wno-pointer-sign 911 912# disable stringop warnings in gcc 8+ 913KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 914 915# We'll want to enable this eventually, but it's not going away for 5.7 at least 916KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 917KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 918KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 919 920# Another good warning that we'll want to enable eventually 921KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 922 923# Enabled with W=2, disabled by default as noisy 924KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 925 926# disable invalid "can't wrap" optimizations for signed / pointers 927KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 928 929# clang sets -fmerge-all-constants by default as optimization, but this 930# is non-conforming behavior for C and in fact breaks the kernel, so we 931# need to disable it here generally. 932KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 933 934# for gcc -fno-merge-all-constants disables everything, but it is fine 935# to have actual conforming behavior enabled. 936KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 937 938# Make sure -fstack-check isn't enabled (like gentoo apparently did) 939KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 940 941# conserve stack if available 942KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 943 944# Prohibit date/time macros, which would make the build non-deterministic 945KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 946 947# enforce correct pointer usage 948KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 949 950# Require designated initializers for all marked structures 951KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 952 953# change __FILE__ to the relative path from the srctree 954KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 955 956# ensure -fcf-protection is disabled when using retpoline as it is 957# incompatible with -mindirect-branch=thunk-extern 958ifdef CONFIG_RETPOLINE 959KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 960endif 961 962include scripts/Makefile.kasan 963include scripts/Makefile.extrawarn 964include scripts/Makefile.ubsan 965include scripts/Makefile.kcsan 966 967# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 968KBUILD_CPPFLAGS += $(KCPPFLAGS) 969KBUILD_AFLAGS += $(KAFLAGS) 970KBUILD_CFLAGS += $(KCFLAGS) 971 972KBUILD_LDFLAGS_MODULE += --build-id 973LDFLAGS_vmlinux += --build-id 974 975ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 976LDFLAGS_vmlinux += $(call ld-option, -X,) 977endif 978 979ifeq ($(CONFIG_RELR),y) 980LDFLAGS_vmlinux += --pack-dyn-relocs=relr 981endif 982 983# Align the bit size of userspace programs with the kernel 984KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 985KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 986 987# make the checker run with the right architecture 988CHECKFLAGS += --arch=$(ARCH) 989 990# insure the checker run with the right endianness 991CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 992 993# the checker needs the correct machine size 994CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 995 996# Default kernel image to build when no specific target is given. 997# KBUILD_IMAGE may be overruled on the command line or 998# set in the environment 999# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1000# this default value 1001export KBUILD_IMAGE ?= vmlinux 1002 1003# 1004# INSTALL_PATH specifies where to place the updated kernel and system map 1005# images. Default is /boot, but you can set it to other values 1006export INSTALL_PATH ?= /boot 1007 1008# 1009# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1010# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1011# an argument if needed. Otherwise it defaults to the kernel install path 1012# 1013export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1014 1015# 1016# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1017# relocations required by build roots. This is not defined in the 1018# makefile but the argument can be passed to make if needed. 1019# 1020 1021MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1022export MODLIB 1023 1024# 1025# INSTALL_MOD_STRIP, if defined, will cause modules to be 1026# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1027# the default option --strip-debug will be used. Otherwise, 1028# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1029 1030ifdef INSTALL_MOD_STRIP 1031ifeq ($(INSTALL_MOD_STRIP),1) 1032mod_strip_cmd = $(STRIP) --strip-debug 1033else 1034mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1035endif # INSTALL_MOD_STRIP=1 1036else 1037mod_strip_cmd = true 1038endif # INSTALL_MOD_STRIP 1039export mod_strip_cmd 1040 1041# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1042# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1043# or CONFIG_MODULE_COMPRESS_XZ. 1044 1045mod_compress_cmd = true 1046ifdef CONFIG_MODULE_COMPRESS 1047 ifdef CONFIG_MODULE_COMPRESS_GZIP 1048 mod_compress_cmd = $(KGZIP) -n -f 1049 endif # CONFIG_MODULE_COMPRESS_GZIP 1050 ifdef CONFIG_MODULE_COMPRESS_XZ 1051 mod_compress_cmd = $(XZ) -f 1052 endif # CONFIG_MODULE_COMPRESS_XZ 1053endif # CONFIG_MODULE_COMPRESS 1054export mod_compress_cmd 1055 1056ifdef CONFIG_MODULE_SIG_ALL 1057$(eval $(call config_filename,MODULE_SIG_KEY)) 1058 1059mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1060else 1061mod_sign_cmd = true 1062endif 1063export mod_sign_cmd 1064 1065HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1066 1067has_libelf = $(call try-run,\ 1068 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1069 1070ifdef CONFIG_STACK_VALIDATION 1071 ifeq ($(has_libelf),1) 1072 objtool_target := tools/objtool FORCE 1073 else 1074 SKIP_STACK_VALIDATION := 1 1075 export SKIP_STACK_VALIDATION 1076 endif 1077endif 1078 1079ifdef CONFIG_DEBUG_INFO_BTF 1080 ifeq ($(has_libelf),1) 1081 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1082 else 1083 ERROR_RESOLVE_BTFIDS := 1 1084 endif 1085endif 1086 1087PHONY += prepare0 1088 1089export MODORDER := $(extmod-prefix)modules.order 1090export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1091 1092ifeq ($(KBUILD_EXTMOD),) 1093core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1094 1095vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1096 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1097 $(libs-y) $(libs-m))) 1098 1099vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1100 $(patsubst %/,%,$(filter %/, $(core-) \ 1101 $(drivers-) $(libs-)))) 1102 1103subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1104 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1105 $(drivers-y) $(drivers-m))) 1106 1107build-dirs := $(vmlinux-dirs) 1108clean-dirs := $(vmlinux-alldirs) 1109 1110# Externally visible symbols (used by link-vmlinux.sh) 1111KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1112KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1113ifdef CONFIG_MODULES 1114KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1115KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1116else 1117KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1118endif 1119KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1120 1121export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1122export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1123export LDFLAGS_vmlinux 1124# used by scripts/Makefile.package 1125export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1126 1127vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1128 1129# Recurse until adjust_autoksyms.sh is satisfied 1130PHONY += autoksyms_recursive 1131ifdef CONFIG_TRIM_UNUSED_KSYMS 1132# For the kernel to actually contain only the needed exported symbols, 1133# we have to build modules as well to determine what those symbols are. 1134# (this can be evaluated only once include/config/auto.conf has been included) 1135KBUILD_MODULES := 1 1136 1137autoksyms_recursive: descend modules.order 1138 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1139 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1140endif 1141 1142autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1143 1144quiet_cmd_autoksyms_h = GEN $@ 1145 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1146 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1147 1148$(autoksyms_h): 1149 $(call cmd,autoksyms_h) 1150 1151ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1152 1153# Final link of vmlinux with optional arch pass after final link 1154cmd_link-vmlinux = \ 1155 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1156 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1157 1158vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1159 +$(call if_changed,link-vmlinux) 1160 1161targets := vmlinux 1162 1163# The actual objects are generated when descending, 1164# make sure no implicit rule kicks in 1165$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1166 1167filechk_kernel.release = \ 1168 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1169 1170# Store (new) KERNELRELEASE string in include/config/kernel.release 1171include/config/kernel.release: FORCE 1172 $(call filechk,kernel.release) 1173 1174# Additional helpers built in scripts/ 1175# Carefully list dependencies so we do not try to build scripts twice 1176# in parallel 1177PHONY += scripts 1178scripts: scripts_basic scripts_dtc 1179 $(Q)$(MAKE) $(build)=$(@) 1180 1181# Things we need to do before we recursively start building the kernel 1182# or the modules are listed in "prepare". 1183# A multi level approach is used. prepareN is processed before prepareN-1. 1184# archprepare is used in arch Makefiles and when processed asm symlink, 1185# version.h and scripts_basic is processed / created. 1186 1187PHONY += prepare archprepare 1188 1189archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1190 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1191 include/generated/autoconf.h 1192 1193prepare0: archprepare 1194 $(Q)$(MAKE) $(build)=scripts/mod 1195 $(Q)$(MAKE) $(build)=. 1196 1197# All the preparing.. 1198prepare: prepare0 prepare-objtool prepare-resolve_btfids 1199 1200# Support for using generic headers in asm-generic 1201asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1202 1203PHONY += asm-generic uapi-asm-generic 1204asm-generic: uapi-asm-generic 1205 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1206 generic=include/asm-generic 1207uapi-asm-generic: 1208 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1209 generic=include/uapi/asm-generic 1210 1211PHONY += prepare-objtool prepare-resolve_btfids 1212prepare-objtool: $(objtool_target) 1213ifeq ($(SKIP_STACK_VALIDATION),1) 1214ifdef CONFIG_UNWINDER_ORC 1215 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1216 @false 1217else 1218 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1219endif 1220endif 1221 1222prepare-resolve_btfids: $(resolve_btfids_target) 1223ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1224 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1225 @false 1226endif 1227# Generate some files 1228# --------------------------------------------------------------------------- 1229 1230# KERNELRELEASE can change from a few different places, meaning version.h 1231# needs to be updated, so this check is forced on all builds 1232 1233uts_len := 64 1234define filechk_utsrelease.h 1235 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1236 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1237 exit 1; \ 1238 fi; \ 1239 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1240endef 1241 1242define filechk_version.h 1243 echo \#define LINUX_VERSION_CODE $(shell \ 1244 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1245 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1246endef 1247 1248$(version_h): FORCE 1249 $(call filechk,version.h) 1250 $(Q)rm -f $(old_version_h) 1251 1252include/generated/utsrelease.h: include/config/kernel.release FORCE 1253 $(call filechk,utsrelease.h) 1254 1255PHONY += headerdep 1256headerdep: 1257 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1258 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1259 1260# --------------------------------------------------------------------------- 1261# Kernel headers 1262 1263#Default location for installed headers 1264export INSTALL_HDR_PATH = $(objtree)/usr 1265 1266quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1267 cmd_headers_install = \ 1268 mkdir -p $(INSTALL_HDR_PATH); \ 1269 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1270 usr/include $(INSTALL_HDR_PATH) 1271 1272PHONY += headers_install 1273headers_install: headers 1274 $(call cmd,headers_install) 1275 1276PHONY += archheaders archscripts 1277 1278hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1279 1280PHONY += headers 1281headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1282 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1283 $(error Headers not exportable for the $(SRCARCH) architecture)) 1284 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1285 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1286 1287# Deprecated. It is no-op now. 1288PHONY += headers_check 1289headers_check: 1290 @: 1291 1292ifdef CONFIG_HEADERS_INSTALL 1293prepare: headers 1294endif 1295 1296PHONY += scripts_unifdef 1297scripts_unifdef: scripts_basic 1298 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1299 1300# --------------------------------------------------------------------------- 1301# Kernel selftest 1302 1303PHONY += kselftest 1304kselftest: 1305 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1306 1307kselftest-%: FORCE 1308 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1309 1310PHONY += kselftest-merge 1311kselftest-merge: 1312 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1313 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1314 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1315 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1316 1317# --------------------------------------------------------------------------- 1318# Devicetree files 1319 1320ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1321dtstree := arch/$(SRCARCH)/boot/dts 1322endif 1323 1324ifneq ($(dtstree),) 1325 1326%.dtb: include/config/kernel.release scripts_dtc 1327 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1328 1329PHONY += dtbs dtbs_install dtbs_check 1330dtbs: include/config/kernel.release scripts_dtc 1331 $(Q)$(MAKE) $(build)=$(dtstree) 1332 1333ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1334export CHECK_DTBS=y 1335dtbs: dt_binding_check 1336endif 1337 1338dtbs_check: dtbs 1339 1340dtbs_install: 1341 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1342 1343ifdef CONFIG_OF_EARLY_FLATTREE 1344all: dtbs 1345endif 1346 1347endif 1348 1349PHONY += scripts_dtc 1350scripts_dtc: scripts_basic 1351 $(Q)$(MAKE) $(build)=scripts/dtc 1352 1353ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1354export CHECK_DT_BINDING=y 1355endif 1356 1357PHONY += dt_binding_check 1358dt_binding_check: scripts_dtc 1359 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1360 1361# --------------------------------------------------------------------------- 1362# Modules 1363 1364ifdef CONFIG_MODULES 1365 1366# By default, build modules as well 1367 1368all: modules 1369 1370# When we're building modules with modversions, we need to consider 1371# the built-in objects during the descend as well, in order to 1372# make sure the checksums are up to date before we record them. 1373ifdef CONFIG_MODVERSIONS 1374 KBUILD_BUILTIN := 1 1375endif 1376 1377# Build modules 1378# 1379# A module can be listed more than once in obj-m resulting in 1380# duplicate lines in modules.order files. Those are removed 1381# using awk while concatenating to the final file. 1382 1383PHONY += modules 1384modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1385 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1386 1387PHONY += modules_check 1388modules_check: modules.order 1389 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1390 1391cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1392 1393modules.order: $(subdir-modorder) FORCE 1394 $(call if_changed,modules_order) 1395 1396targets += modules.order 1397 1398# Target to prepare building external modules 1399PHONY += modules_prepare 1400modules_prepare: prepare 1401 1402# Target to install modules 1403PHONY += modules_install 1404modules_install: _modinst_ _modinst_post 1405 1406PHONY += _modinst_ 1407_modinst_: 1408 @rm -rf $(MODLIB)/kernel 1409 @rm -f $(MODLIB)/source 1410 @mkdir -p $(MODLIB)/kernel 1411 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1412 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1413 rm -f $(MODLIB)/build ; \ 1414 ln -s $(CURDIR) $(MODLIB)/build ; \ 1415 fi 1416 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1417 @cp -f modules.builtin $(MODLIB)/ 1418 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1419 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1420 1421# This depmod is only for convenience to give the initial 1422# boot a modules.dep even before / is mounted read-write. However the 1423# boot script depmod is the master version. 1424PHONY += _modinst_post 1425_modinst_post: _modinst_ 1426 $(call cmd,depmod) 1427 1428ifeq ($(CONFIG_MODULE_SIG), y) 1429PHONY += modules_sign 1430modules_sign: 1431 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1432endif 1433 1434else # CONFIG_MODULES 1435 1436# Modules not configured 1437# --------------------------------------------------------------------------- 1438 1439PHONY += modules modules_install 1440modules modules_install: 1441 @echo >&2 1442 @echo >&2 "The present kernel configuration has modules disabled." 1443 @echo >&2 "Type 'make config' and enable loadable module support." 1444 @echo >&2 "Then build a kernel with module support enabled." 1445 @echo >&2 1446 @exit 1 1447 1448endif # CONFIG_MODULES 1449 1450### 1451# Cleaning is done on three levels. 1452# make clean Delete most generated files 1453# Leave enough to build external modules 1454# make mrproper Delete the current configuration, and all generated files 1455# make distclean Remove editor backup files, patch leftover files and the like 1456 1457# Directories & files removed with 'make clean' 1458CLEAN_FILES += include/ksym vmlinux.symvers \ 1459 modules.builtin modules.builtin.modinfo modules.nsdeps 1460 1461# Directories & files removed with 'make mrproper' 1462MRPROPER_FILES += include/config include/generated \ 1463 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1464 debian snap tar-install \ 1465 .config .config.old .version \ 1466 Module.symvers \ 1467 signing_key.pem signing_key.priv signing_key.x509 \ 1468 x509.genkey extra_certificates signing_key.x509.keyid \ 1469 signing_key.x509.signer vmlinux-gdb.py \ 1470 *.spec 1471 1472# Directories & files removed with 'make distclean' 1473DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1474 1475# clean - Delete most, but leave enough to build external modules 1476# 1477clean: rm-files := $(CLEAN_FILES) 1478 1479PHONY += archclean vmlinuxclean 1480 1481vmlinuxclean: 1482 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1483 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1484 1485clean: archclean vmlinuxclean 1486 1487# mrproper - Delete all generated files, including .config 1488# 1489mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1490mrproper-dirs := $(addprefix _mrproper_,scripts) 1491 1492PHONY += $(mrproper-dirs) mrproper 1493$(mrproper-dirs): 1494 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1495 1496mrproper: clean $(mrproper-dirs) 1497 $(call cmd,rmfiles) 1498 1499# distclean 1500# 1501distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1502 1503PHONY += distclean 1504 1505distclean: mrproper 1506 $(call cmd,rmfiles) 1507 @find $(srctree) $(RCS_FIND_IGNORE) \ 1508 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1509 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1510 -o -name 'core' \) \ 1511 -type f -print | xargs rm -f 1512 1513 1514# Packaging of the kernel to various formats 1515# --------------------------------------------------------------------------- 1516 1517%src-pkg: FORCE 1518 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1519%pkg: include/config/kernel.release FORCE 1520 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1521 1522# Brief documentation of the typical targets used 1523# --------------------------------------------------------------------------- 1524 1525boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1526boards := $(sort $(notdir $(boards))) 1527board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1528board-dirs := $(sort $(notdir $(board-dirs:/=))) 1529 1530PHONY += help 1531help: 1532 @echo 'Cleaning targets:' 1533 @echo ' clean - Remove most generated files but keep the config and' 1534 @echo ' enough build support to build external modules' 1535 @echo ' mrproper - Remove all generated files + config + various backup files' 1536 @echo ' distclean - mrproper + remove editor backup and patch files' 1537 @echo '' 1538 @echo 'Configuration targets:' 1539 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1540 @echo '' 1541 @echo 'Other generic targets:' 1542 @echo ' all - Build all targets marked with [*]' 1543 @echo '* vmlinux - Build the bare kernel' 1544 @echo '* modules - Build all modules' 1545 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1546 @echo ' dir/ - Build all files in dir and below' 1547 @echo ' dir/file.[ois] - Build specified target only' 1548 @echo ' dir/file.ll - Build the LLVM assembly file' 1549 @echo ' (requires compiler support for LLVM assembly generation)' 1550 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1551 @echo ' (requires a recent binutils and recent build (System.map))' 1552 @echo ' dir/file.ko - Build module including final link' 1553 @echo ' modules_prepare - Set up for building external modules' 1554 @echo ' tags/TAGS - Generate tags file for editors' 1555 @echo ' cscope - Generate cscope index' 1556 @echo ' gtags - Generate GNU GLOBAL index' 1557 @echo ' kernelrelease - Output the release version string (use with make -s)' 1558 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1559 @echo ' image_name - Output the image name (use with make -s)' 1560 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1561 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1562 echo '' 1563 @echo 'Static analysers:' 1564 @echo ' checkstack - Generate a list of stack hogs' 1565 @echo ' namespacecheck - Name space analysis on compiled kernel' 1566 @echo ' versioncheck - Sanity check on version.h usage' 1567 @echo ' includecheck - Check for duplicate included header files' 1568 @echo ' export_report - List the usages of all exported symbols' 1569 @echo ' headerdep - Detect inclusion cycles in headers' 1570 @echo ' coccicheck - Check with Coccinelle' 1571 @echo '' 1572 @echo 'Tools:' 1573 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1574 @echo '' 1575 @echo 'Kernel selftest:' 1576 @echo ' kselftest - Build and run kernel selftest' 1577 @echo ' Build, install, and boot kernel before' 1578 @echo ' running kselftest on it' 1579 @echo ' Run as root for full coverage' 1580 @echo ' kselftest-all - Build kernel selftest' 1581 @echo ' kselftest-install - Build and install kernel selftest' 1582 @echo ' kselftest-clean - Remove all generated kselftest files' 1583 @echo ' kselftest-merge - Merge all the config dependencies of' 1584 @echo ' kselftest to existing .config.' 1585 @echo '' 1586 @$(if $(dtstree), \ 1587 echo 'Devicetree:'; \ 1588 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1589 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1590 echo ' dt_binding_check - Validate device tree binding documents'; \ 1591 echo ' dtbs_check - Validate device tree source files';\ 1592 echo '') 1593 1594 @echo 'Userspace tools targets:' 1595 @echo ' use "make tools/help"' 1596 @echo ' or "cd tools; make help"' 1597 @echo '' 1598 @echo 'Kernel packaging:' 1599 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1600 @echo '' 1601 @echo 'Documentation targets:' 1602 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1603 @echo '' 1604 @echo 'Architecture specific targets ($(SRCARCH)):' 1605 @$(if $(archhelp),$(archhelp),\ 1606 echo ' No architecture specific help defined for $(SRCARCH)') 1607 @echo '' 1608 @$(if $(boards), \ 1609 $(foreach b, $(boards), \ 1610 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1611 echo '') 1612 @$(if $(board-dirs), \ 1613 $(foreach b, $(board-dirs), \ 1614 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1615 printf " %-16s - Show all of the above\\n" help-boards; \ 1616 echo '') 1617 1618 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1619 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1620 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1621 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1622 @echo ' (sparse by default)' 1623 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1624 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1625 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1626 @echo ' 1: warnings which may be relevant and do not occur too often' 1627 @echo ' 2: warnings which occur quite often but may still be relevant' 1628 @echo ' 3: more obscure warnings, can most likely be ignored' 1629 @echo ' Multiple levels can be combined with W=12 or W=123' 1630 @echo '' 1631 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1632 @echo 'For further info see the ./README file' 1633 1634 1635help-board-dirs := $(addprefix help-,$(board-dirs)) 1636 1637help-boards: $(help-board-dirs) 1638 1639boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1640 1641$(help-board-dirs): help-%: 1642 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1643 @$(if $(boards-per-dir), \ 1644 $(foreach b, $(boards-per-dir), \ 1645 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1646 echo '') 1647 1648 1649# Documentation targets 1650# --------------------------------------------------------------------------- 1651DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1652 linkcheckdocs dochelp refcheckdocs 1653PHONY += $(DOC_TARGETS) 1654$(DOC_TARGETS): 1655 $(Q)$(MAKE) $(build)=Documentation $@ 1656 1657# Misc 1658# --------------------------------------------------------------------------- 1659 1660PHONY += scripts_gdb 1661scripts_gdb: prepare0 1662 $(Q)$(MAKE) $(build)=scripts/gdb 1663 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1664 1665ifdef CONFIG_GDB_SCRIPTS 1666all: scripts_gdb 1667endif 1668 1669else # KBUILD_EXTMOD 1670 1671### 1672# External module support. 1673# When building external modules the kernel used as basis is considered 1674# read-only, and no consistency checks are made and the make 1675# system is not used on the basis kernel. If updates are required 1676# in the basis kernel ordinary make commands (without M=...) must 1677# be used. 1678# 1679# The following are the only valid targets when building external 1680# modules. 1681# make M=dir clean Delete all automatically generated files 1682# make M=dir modules Make all modules in specified dir 1683# make M=dir Same as 'make M=dir modules' 1684# make M=dir modules_install 1685# Install the modules built in the module directory 1686# Assumes install directory is already created 1687 1688# We are always building modules 1689KBUILD_MODULES := 1 1690 1691build-dirs := $(KBUILD_EXTMOD) 1692PHONY += modules 1693modules: descend 1694 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1695 1696PHONY += modules_install 1697modules_install: _emodinst_ _emodinst_post 1698 1699install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1700PHONY += _emodinst_ 1701_emodinst_: 1702 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1703 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1704 1705PHONY += _emodinst_post 1706_emodinst_post: _emodinst_ 1707 $(call cmd,depmod) 1708 1709clean-dirs := $(KBUILD_EXTMOD) 1710clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1711 1712PHONY += help 1713help: 1714 @echo ' Building external modules.' 1715 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1716 @echo '' 1717 @echo ' modules - default target, build the module(s)' 1718 @echo ' modules_install - install the module' 1719 @echo ' clean - remove generated files in module directory only' 1720 @echo '' 1721 1722PHONY += prepare 1723endif # KBUILD_EXTMOD 1724 1725# Single targets 1726# --------------------------------------------------------------------------- 1727# To build individual files in subdirectories, you can do like this: 1728# 1729# make foo/bar/baz.s 1730# 1731# The supported suffixes for single-target are listed in 'single-targets' 1732# 1733# To build only under specific subdirectories, you can do like this: 1734# 1735# make foo/bar/baz/ 1736 1737ifdef single-build 1738 1739# .ko is special because modpost is needed 1740single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1741single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1742 1743$(single-ko): single_modpost 1744 @: 1745$(single-no-ko): descend 1746 @: 1747 1748ifeq ($(KBUILD_EXTMOD),) 1749# For the single build of in-tree modules, use a temporary file to avoid 1750# the situation of modules_install installing an invalid modules.order. 1751MODORDER := .modules.tmp 1752endif 1753 1754PHONY += single_modpost 1755single_modpost: $(single-no-ko) 1756 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1757 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1758 1759KBUILD_MODULES := 1 1760 1761export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1762 1763# trim unrelated directories 1764build-dirs := $(foreach d, $(build-dirs), \ 1765 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1766 1767endif 1768 1769ifndef CONFIG_MODULES 1770KBUILD_MODULES := 1771endif 1772 1773# Handle descending into subdirectories listed in $(build-dirs) 1774# Preset locale variables to speed up the build process. Limit locale 1775# tweaks to this spot to avoid wrong language settings when running 1776# make menuconfig etc. 1777# Error messages still appears in the original language 1778PHONY += descend $(build-dirs) 1779descend: $(build-dirs) 1780$(build-dirs): prepare 1781 $(Q)$(MAKE) $(build)=$@ \ 1782 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1783 need-builtin=1 need-modorder=1 1784 1785clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1786PHONY += $(clean-dirs) clean 1787$(clean-dirs): 1788 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1789 1790clean: $(clean-dirs) 1791 $(call cmd,rmfiles) 1792 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1793 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1794 -o -name '*.ko.*' \ 1795 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1796 -o -name '*.dwo' -o -name '*.lst' \ 1797 -o -name '*.su' -o -name '*.mod' \ 1798 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1799 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1800 -o -name '*.asn1.[ch]' \ 1801 -o -name '*.symtypes' -o -name 'modules.order' \ 1802 -o -name '.tmp_*.o.*' \ 1803 -o -name '*.c.[012]*.*' \ 1804 -o -name '*.ll' \ 1805 -o -name '*.gcno' \) -type f -print | xargs rm -f 1806 1807# Generate tags for editors 1808# --------------------------------------------------------------------------- 1809quiet_cmd_tags = GEN $@ 1810 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1811 1812tags TAGS cscope gtags: FORCE 1813 $(call cmd,tags) 1814 1815# Script to generate missing namespace dependencies 1816# --------------------------------------------------------------------------- 1817 1818PHONY += nsdeps 1819nsdeps: export KBUILD_NSDEPS=1 1820nsdeps: modules 1821 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1822 1823# Scripts to check various things for consistency 1824# --------------------------------------------------------------------------- 1825 1826PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1827 1828includecheck: 1829 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1830 -name '*.[hcS]' -type f -print | sort \ 1831 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1832 1833versioncheck: 1834 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1835 -name '*.[hcS]' -type f -print | sort \ 1836 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1837 1838coccicheck: 1839 $(Q)$(BASH) $(srctree)/scripts/$@ 1840 1841namespacecheck: 1842 $(PERL) $(srctree)/scripts/namespace.pl 1843 1844export_report: 1845 $(PERL) $(srctree)/scripts/export_report.pl 1846 1847PHONY += checkstack kernelrelease kernelversion image_name 1848 1849# UML needs a little special treatment here. It wants to use the host 1850# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1851# else wants $(ARCH), including people doing cross-builds, which means 1852# that $(SUBARCH) doesn't work here. 1853ifeq ($(ARCH), um) 1854CHECKSTACK_ARCH := $(SUBARCH) 1855else 1856CHECKSTACK_ARCH := $(ARCH) 1857endif 1858checkstack: 1859 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1860 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1861 1862kernelrelease: 1863 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1864 1865kernelversion: 1866 @echo $(KERNELVERSION) 1867 1868image_name: 1869 @echo $(KBUILD_IMAGE) 1870 1871# Clear a bunch of variables before executing the submake 1872 1873ifeq ($(quiet),silent_) 1874tools_silent=s 1875endif 1876 1877tools/: FORCE 1878 $(Q)mkdir -p $(objtree)/tools 1879 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1880 1881tools/%: FORCE 1882 $(Q)mkdir -p $(objtree)/tools 1883 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1884 1885quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1886 cmd_rmfiles = rm -rf $(rm-files) 1887 1888# Run depmod only if we have System.map and depmod is executable 1889quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1890 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1891 $(KERNELRELEASE) 1892 1893# read saved command lines for existing targets 1894existing-targets := $(wildcard $(sort $(targets))) 1895 1896-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1897 1898endif # config-build 1899endif # mixed-build 1900endif # need-sub-make 1901 1902PHONY += FORCE 1903FORCE: 1904 1905# Declare the contents of the PHONY variable as phony. We keep that 1906# information in a variable so we can use it in if_changed and friends. 1907.PHONY: $(PHONY) 1908