1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Frozen Wasteland 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 --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132export KBUILD_EXTMOD 133 134# Kbuild will save output files in the current working directory. 135# This does not need to match to the root of the kernel source tree. 136# 137# For example, you can do this: 138# 139# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 140# 141# If you want to save output files in a different location, there are 142# two syntaxes to specify it. 143# 144# 1) O= 145# Use "make O=dir/to/store/output/files/" 146# 147# 2) Set KBUILD_OUTPUT 148# Set the environment variable KBUILD_OUTPUT to point to the output directory. 149# export KBUILD_OUTPUT=dir/to/store/output/files/; make 150# 151# The O= assignment takes precedence over the KBUILD_OUTPUT environment 152# variable. 153 154# Do we want to change the working directory? 155ifeq ("$(origin O)", "command line") 156 KBUILD_OUTPUT := $(O) 157endif 158 159ifneq ($(KBUILD_OUTPUT),) 160# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 161# expand a shell special character '~'. We use a somewhat tedious way here. 162abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 163$(if $(abs_objtree),, \ 164 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 165 166# $(realpath ...) resolves symlinks 167abs_objtree := $(realpath $(abs_objtree)) 168else 169abs_objtree := $(CURDIR) 170endif # ifneq ($(KBUILD_OUTPUT),) 171 172ifeq ($(abs_objtree),$(CURDIR)) 173# Suppress "Entering directory ..." unless we are changing the work directory. 174MAKEFLAGS += --no-print-directory 175else 176need-sub-make := 1 177endif 178 179this-makefile := $(lastword $(MAKEFILE_LIST)) 180abs_srctree := $(realpath $(dir $(this-makefile))) 181 182ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 183$(error source directory cannot contain spaces or colons) 184endif 185 186ifneq ($(abs_srctree),$(abs_objtree)) 187# Look for make include files relative to root of kernel src 188# 189# This does not become effective immediately because MAKEFLAGS is re-parsed 190# once after the Makefile is read. We need to invoke sub-make. 191MAKEFLAGS += --include-dir=$(abs_srctree) 192need-sub-make := 1 193endif 194 195ifneq ($(filter 3.%,$(MAKE_VERSION)),) 196# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 197# We need to invoke sub-make to avoid implicit rules in the top Makefile. 198need-sub-make := 1 199# Cancel implicit rules for this Makefile. 200$(this-makefile): ; 201endif 202 203export abs_srctree abs_objtree 204export sub_make_done := 1 205 206ifeq ($(need-sub-make),1) 207 208PHONY += $(MAKECMDGOALS) __sub-make 209 210$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 211 @: 212 213# Invoke a second make in the output directory, passing relevant variables 214__sub-make: 215 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 216 217endif # need-sub-make 218endif # sub_make_done 219 220# We process the rest of the Makefile if this is the final invocation of make 221ifeq ($(need-sub-make),) 222 223# Do not print "Entering directory ...", 224# but we want to display it when entering to the output directory 225# so that IDEs/editors are able to understand relative filenames. 226MAKEFLAGS += --no-print-directory 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 260 261clean-targets := %clean mrproper cleandocs 262no-dot-config-targets := $(clean-targets) \ 263 cscope gtags TAGS tags help% %docs check% coccicheck \ 264 $(version_h) headers headers_% archheaders archscripts \ 265 %asm-generic kernelversion %src-pkg dt_binding_check \ 266 outputmakefile 267no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 268 image_name 269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271config-build := 272mixed-build := 273need-config := 1 274may-sync-config := 1 275single-build := 276 277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281endif 282 283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287endif 288 289ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291endif 292 293ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300endif 301 302# We cannot build single targets and the others at the same time 303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# For "make -j clean all", "make -j mrproper defconfig all", etc. 311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# install and modules_install need also be processed one by one 318ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324ifdef mixed-build 325# =========================================================================== 326# We're called with mixed targets (*config and build targets). 327# Handle them one by one. 328 329PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331$(MAKECMDGOALS): __build_one_by_one 332 @: 333 334__build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340else # !mixed-build 341 342include scripts/Kbuild.include 343 344# Read KERNELRELEASE from include/config/kernel.release (if it exists) 345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349include scripts/subarch.include 350 351# Cross compiling and selecting different set of gcc/bin-utils 352# --------------------------------------------------------------------------- 353# 354# When performing cross compilation for other architectures ARCH shall be set 355# to the target architecture. (See arch/* for the possibilities). 356# ARCH can be set during invocation of make: 357# make ARCH=ia64 358# Another way is to have ARCH set in the environment. 359# The default ARCH is the host where make is executed. 360 361# CROSS_COMPILE specify the prefix used for all executables used 362# during compilation. Only gcc and related bin-utils executables 363# are prefixed with $(CROSS_COMPILE). 364# CROSS_COMPILE can be set on the command line 365# make CROSS_COMPILE=ia64-linux- 366# Alternatively CROSS_COMPILE can be set in the environment. 367# Default value for CROSS_COMPILE is not to prefix executables 368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369ARCH ?= $(SUBARCH) 370 371# Architecture as present in compile.h 372UTS_MACHINE := $(ARCH) 373SRCARCH := $(ARCH) 374 375# Additional ARCH settings for x86 376ifeq ($(ARCH),i386) 377 SRCARCH := x86 378endif 379ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381endif 382 383# Additional ARCH settings for sparc 384ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386endif 387ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389endif 390 391# Additional ARCH settings for sh 392ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394endif 395 396KCONFIG_CONFIG ?= .config 397export KCONFIG_CONFIG 398 399# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 400export KBUILD_DEFCONFIG := defconfig 401 402# SHELL used by kbuild 403CONFIG_SHELL := sh 404 405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 408 409ifneq ($(LLVM),) 410HOSTCC = clang 411HOSTCXX = clang++ 412else 413HOSTCC = gcc 414HOSTCXX = g++ 415endif 416 417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 418 -O2 -fomit-frame-pointer -std=gnu89 419export KBUILD_USERLDFLAGS := 420 421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 425 426# Make variables (CC, etc...) 427CPP = $(CC) -E 428ifneq ($(LLVM),) 429CC = clang 430LD = ld.lld 431AR = llvm-ar 432NM = llvm-nm 433OBJCOPY = llvm-objcopy 434OBJDUMP = llvm-objdump 435READELF = llvm-readelf 436STRIP = llvm-strip 437else 438CC = $(CROSS_COMPILE)gcc 439LD = $(CROSS_COMPILE)ld 440AR = $(CROSS_COMPILE)ar 441NM = $(CROSS_COMPILE)nm 442OBJCOPY = $(CROSS_COMPILE)objcopy 443OBJDUMP = $(CROSS_COMPILE)objdump 444READELF = $(CROSS_COMPILE)readelf 445STRIP = $(CROSS_COMPILE)strip 446endif 447PAHOLE = pahole 448RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 449LEX = flex 450YACC = bison 451AWK = awk 452INSTALLKERNEL := installkernel 453DEPMOD = depmod 454PERL = perl 455PYTHON3 = python3 456CHECK = sparse 457BASH = bash 458KGZIP = gzip 459KBZIP2 = bzip2 460KLZOP = lzop 461LZMA = lzma 462LZ4 = lz4c 463XZ = xz 464ZSTD = zstd 465 466CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 467 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 468NOSTDINC_FLAGS := 469CFLAGS_MODULE = 470AFLAGS_MODULE = 471LDFLAGS_MODULE = 472CFLAGS_KERNEL = 473AFLAGS_KERNEL = 474LDFLAGS_vmlinux = 475 476# Use USERINCLUDE when you must reference the UAPI directories only. 477USERINCLUDE := \ 478 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 479 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 480 -I$(srctree)/include/uapi \ 481 -I$(objtree)/include/generated/uapi \ 482 -include $(srctree)/include/linux/compiler-version.h \ 483 -include $(srctree)/include/linux/kconfig.h 484 485# Use LINUXINCLUDE when you must reference the include/ directory. 486# Needed to be compatible with the O= option 487LINUXINCLUDE := \ 488 -I$(srctree)/arch/$(SRCARCH)/include \ 489 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 490 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 491 -I$(objtree)/include \ 492 $(USERINCLUDE) 493 494KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 495KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 496 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 497 -Werror=implicit-function-declaration -Werror=implicit-int \ 498 -Werror=return-type -Wno-format-security \ 499 -std=gnu89 500KBUILD_CPPFLAGS := -D__KERNEL__ 501KBUILD_AFLAGS_KERNEL := 502KBUILD_CFLAGS_KERNEL := 503KBUILD_AFLAGS_MODULE := -DMODULE 504KBUILD_CFLAGS_MODULE := -DMODULE 505KBUILD_LDFLAGS_MODULE := 506KBUILD_LDFLAGS := 507CLANG_FLAGS := 508 509export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 510export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 511export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 512export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 513export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 514 515export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 516export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 517export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 518export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 519export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 520 521# Files to ignore in find ... statements 522 523export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 524 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 525 -prune -o 526export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 527 --exclude CVS --exclude .pc --exclude .hg --exclude .git 528 529# =========================================================================== 530# Rules shared between *config targets and build targets 531 532# Basic helpers built in scripts/basic/ 533PHONY += scripts_basic 534scripts_basic: 535 $(Q)$(MAKE) $(build)=scripts/basic 536 $(Q)rm -f .tmp_quiet_recordmcount 537 538PHONY += outputmakefile 539# Before starting out-of-tree build, make sure the source tree is clean. 540# outputmakefile generates a Makefile in the output directory, if using a 541# separate output directory. This allows convenient use of make in the 542# output directory. 543# At the same time when output Makefile generated, generate .gitignore to 544# ignore whole output directory 545outputmakefile: 546ifdef building_out_of_srctree 547 $(Q)if [ -f $(srctree)/.config -o \ 548 -d $(srctree)/include/config -o \ 549 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 550 echo >&2 "***"; \ 551 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 552 echo >&2 "*** in $(abs_srctree)";\ 553 echo >&2 "***"; \ 554 false; \ 555 fi 556 $(Q)ln -fsn $(srctree) source 557 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 558 $(Q)test -e .gitignore || \ 559 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 560endif 561 562# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 563# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 564# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 565# and from include/config/auto.conf.cmd to detect the compiler upgrade. 566CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g') 567 568ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 569ifneq ($(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 += $(CLANG_FLAGS) 584export CLANG_FLAGS 585endif 586 587ifdef config-build 588# =========================================================================== 589# *config targets only - make sure prerequisites are updated, and descend 590# in scripts/kconfig to make the *config target 591 592# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 593# KBUILD_DEFCONFIG may point out an alternative default configuration 594# used for 'make defconfig' 595include arch/$(SRCARCH)/Makefile 596export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 597 598config: outputmakefile scripts_basic FORCE 599 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 600 601%config: outputmakefile scripts_basic FORCE 602 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 603 604else #!config-build 605# =========================================================================== 606# Build targets only - this includes vmlinux, arch specific targets, clean 607# targets and others. In general all targets except *config targets. 608 609# If building an external module we do not care about the all: rule 610# but instead __all depend on modules 611PHONY += all 612ifeq ($(KBUILD_EXTMOD),) 613__all: all 614else 615__all: modules 616endif 617 618# Decide whether to build built-in, modular, or both. 619# Normally, just do built-in. 620 621KBUILD_MODULES := 622KBUILD_BUILTIN := 1 623 624# If we have only "make modules", don't compile built-in objects. 625ifeq ($(MAKECMDGOALS),modules) 626 KBUILD_BUILTIN := 627endif 628 629# If we have "make <whatever> modules", compile modules 630# in addition to whatever we do anyway. 631# Just "make" or "make all" shall build modules as well 632 633ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 634 KBUILD_MODULES := 1 635endif 636 637ifeq ($(MAKECMDGOALS),) 638 KBUILD_MODULES := 1 639endif 640 641export KBUILD_MODULES KBUILD_BUILTIN 642 643ifdef need-config 644include include/config/auto.conf 645endif 646 647ifeq ($(KBUILD_EXTMOD),) 648# Objects we will link into vmlinux / subdirs we need to visit 649core-y := init/ usr/ 650drivers-y := drivers/ sound/ 651drivers-$(CONFIG_SAMPLES) += samples/ 652drivers-$(CONFIG_NET) += net/ 653drivers-y += virt/ 654libs-y := lib/ 655endif # KBUILD_EXTMOD 656 657# The all: target is the default when no target is given on the 658# command line. 659# This allow a user to issue only 'make' to build a kernel including modules 660# Defaults to vmlinux, but the arch makefile usually adds further targets 661all: vmlinux 662 663CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 664 $(call cc-option,-fno-tree-loop-im) \ 665 $(call cc-disable-warning,maybe-uninitialized,) 666export CFLAGS_GCOV 667 668# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 669ifdef CONFIG_FUNCTION_TRACER 670 CC_FLAGS_FTRACE := -pg 671endif 672 673RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 674RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 675RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 676RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 677RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 678RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 679export RETPOLINE_CFLAGS 680export RETPOLINE_VDSO_CFLAGS 681 682include arch/$(SRCARCH)/Makefile 683 684ifdef need-config 685ifdef may-sync-config 686# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 687# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 688# because some architectures define CROSS_COMPILE there. 689include include/config/auto.conf.cmd 690 691$(KCONFIG_CONFIG): 692 @echo >&2 '***' 693 @echo >&2 '*** Configuration file "$@" not found!' 694 @echo >&2 '***' 695 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 696 @echo >&2 '*** "make menuconfig" or "make xconfig").' 697 @echo >&2 '***' 698 @/bin/false 699 700# The actual configuration files used during the build are stored in 701# include/generated/ and include/config/. Update them if .config is newer than 702# include/config/auto.conf (which mirrors .config). 703# 704# This exploits the 'multi-target pattern rule' trick. 705# The syncconfig should be executed only once to make all the targets. 706# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 707quiet_cmd_syncconfig = SYNC $@ 708 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 709 710%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 711 +$(call cmd,syncconfig) 712else # !may-sync-config 713# External modules and some install targets need include/generated/autoconf.h 714# and include/config/auto.conf but do not care if they are up-to-date. 715# Use auto.conf to trigger the test 716PHONY += include/config/auto.conf 717 718include/config/auto.conf: 719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 720 echo >&2; \ 721 echo >&2 " ERROR: Kernel configuration is invalid."; \ 722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 724 echo >&2 ; \ 725 /bin/false) 726 727endif # may-sync-config 728endif # need-config 729 730KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 731KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 732KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 733KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 734KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 735 736ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 737KBUILD_CFLAGS += -O2 738else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 739KBUILD_CFLAGS += -O3 740else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 741KBUILD_CFLAGS += -Os 742endif 743 744# Tell gcc to never replace conditional load with a non-conditional one 745KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 746KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 747 748ifdef CONFIG_READABLE_ASM 749# Disable optimizations that make assembler listings hard to read. 750# reorder blocks reorders the control in the function 751# ipa clone creates specialized cloned functions 752# partial inlining inlines only parts of functions 753KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 754 $(call cc-option,-fno-ipa-cp-clone,) \ 755 $(call cc-option,-fno-partial-inlining) 756endif 757 758ifneq ($(CONFIG_FRAME_WARN),0) 759KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 760endif 761 762stackp-flags-y := -fno-stack-protector 763stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 764stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 765 766KBUILD_CFLAGS += $(stackp-flags-y) 767 768ifdef CONFIG_CC_IS_CLANG 769KBUILD_CPPFLAGS += -Qunused-arguments 770KBUILD_CFLAGS += -Wno-format-invalid-specifier 771KBUILD_CFLAGS += -Wno-gnu 772# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 773# source of a reference will be _MergedGlobals and not on of the whitelisted names. 774# See modpost pattern 2 775KBUILD_CFLAGS += -mno-global-merge 776else 777 778# These warnings generated too much noise in a regular build. 779# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 780KBUILD_CFLAGS += -Wno-unused-but-set-variable 781 782# Warn about unmarked fall-throughs in switch statement. 783# Disabled for clang while comment to attribute conversion happens and 784# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 785KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 786endif 787 788KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 789ifdef CONFIG_FRAME_POINTER 790KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 791else 792# Some targets (ARM with Thumb2, for example), can't be built with frame 793# pointers. For those, we don't have FUNCTION_TRACER automatically 794# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 795# incompatible with -fomit-frame-pointer with current GCC, so we don't use 796# -fomit-frame-pointer with FUNCTION_TRACER. 797ifndef CONFIG_FUNCTION_TRACER 798KBUILD_CFLAGS += -fomit-frame-pointer 799endif 800endif 801 802# Initialize all stack variables with a 0xAA pattern. 803ifdef CONFIG_INIT_STACK_ALL_PATTERN 804KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 805endif 806 807# Initialize all stack variables with a zero value. 808ifdef CONFIG_INIT_STACK_ALL_ZERO 809# Future support for zero initialization is still being debated, see 810# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 811# renamed or dropped. 812KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 813KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 814endif 815 816DEBUG_CFLAGS := 817 818# Workaround for GCC versions < 5.0 819# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 820ifdef CONFIG_CC_IS_GCC 821DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 822endif 823 824ifdef CONFIG_DEBUG_INFO 825 826ifdef CONFIG_DEBUG_INFO_SPLIT 827DEBUG_CFLAGS += -gsplit-dwarf 828else 829DEBUG_CFLAGS += -g 830endif 831 832ifneq ($(LLVM_IAS),1) 833KBUILD_AFLAGS += -Wa,-gdwarf-2 834endif 835 836ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 837dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 838dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 839DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 840endif 841 842ifdef CONFIG_DEBUG_INFO_REDUCED 843DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 844 $(call cc-option,-fno-var-tracking) 845endif 846 847ifdef CONFIG_DEBUG_INFO_COMPRESSED 848DEBUG_CFLAGS += -gz=zlib 849KBUILD_AFLAGS += -gz=zlib 850KBUILD_LDFLAGS += --compress-debug-sections=zlib 851endif 852 853endif # CONFIG_DEBUG_INFO 854 855KBUILD_CFLAGS += $(DEBUG_CFLAGS) 856export DEBUG_CFLAGS 857 858ifdef CONFIG_FUNCTION_TRACER 859ifdef CONFIG_FTRACE_MCOUNT_USE_CC 860 CC_FLAGS_FTRACE += -mrecord-mcount 861 ifdef CONFIG_HAVE_NOP_MCOUNT 862 ifeq ($(call cc-option-yn, -mnop-mcount),y) 863 CC_FLAGS_FTRACE += -mnop-mcount 864 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 865 endif 866 endif 867endif 868ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 869 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 870endif 871ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 872 ifdef CONFIG_HAVE_C_RECORDMCOUNT 873 BUILD_C_RECORDMCOUNT := y 874 export BUILD_C_RECORDMCOUNT 875 endif 876endif 877ifdef CONFIG_HAVE_FENTRY 878 ifeq ($(call cc-option-yn, -mfentry),y) 879 CC_FLAGS_FTRACE += -mfentry 880 CC_FLAGS_USING += -DCC_USING_FENTRY 881 endif 882endif 883export CC_FLAGS_FTRACE 884KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 885KBUILD_AFLAGS += $(CC_FLAGS_USING) 886endif 887 888# We trigger additional mismatches with less inlining 889ifdef CONFIG_DEBUG_SECTION_MISMATCH 890KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 891endif 892 893ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 894KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 895LDFLAGS_vmlinux += --gc-sections 896endif 897 898ifdef CONFIG_SHADOW_CALL_STACK 899CC_FLAGS_SCS := -fsanitize=shadow-call-stack 900KBUILD_CFLAGS += $(CC_FLAGS_SCS) 901export CC_FLAGS_SCS 902endif 903 904ifdef CONFIG_LTO_CLANG 905ifdef CONFIG_LTO_CLANG_THIN 906CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 907KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 908else 909CC_FLAGS_LTO := -flto 910endif 911CC_FLAGS_LTO += -fvisibility=hidden 912 913# Limit inlining across translation units to reduce binary size 914KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 915endif 916 917ifdef CONFIG_LTO 918KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 919KBUILD_AFLAGS += -fno-lto 920export CC_FLAGS_LTO 921endif 922 923ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 924KBUILD_CFLAGS += -falign-functions=32 925endif 926 927# arch Makefile may override CC so keep this after arch Makefile is included 928NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 929 930# warn about C99 declaration after statement 931KBUILD_CFLAGS += -Wdeclaration-after-statement 932 933# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 934KBUILD_CFLAGS += -Wvla 935 936# disable pointer signed / unsigned warnings in gcc 4.0 937KBUILD_CFLAGS += -Wno-pointer-sign 938 939# disable stringop warnings in gcc 8+ 940KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 941 942# We'll want to enable this eventually, but it's not going away for 5.7 at least 943KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 944KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 945KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 946 947# Another good warning that we'll want to enable eventually 948KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 949 950# Enabled with W=2, disabled by default as noisy 951KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 952 953# disable invalid "can't wrap" optimizations for signed / pointers 954KBUILD_CFLAGS += -fno-strict-overflow 955 956# Make sure -fstack-check isn't enabled (like gentoo apparently did) 957KBUILD_CFLAGS += -fno-stack-check 958 959# conserve stack if available 960KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 961 962# Prohibit date/time macros, which would make the build non-deterministic 963KBUILD_CFLAGS += -Werror=date-time 964 965# enforce correct pointer usage 966KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 967 968# Require designated initializers for all marked structures 969KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 970 971# change __FILE__ to the relative path from the srctree 972KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 973 974# include additional Makefiles when needed 975include-y := scripts/Makefile.extrawarn 976include-$(CONFIG_KASAN) += scripts/Makefile.kasan 977include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 978include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 979include-$(CONFIG_KCOV) += scripts/Makefile.kcov 980include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 981 982include $(addprefix $(srctree)/, $(include-y)) 983 984# scripts/Makefile.gcc-plugins is intentionally included last. 985# Do not add $(call cc-option,...) below this line. When you build the kernel 986# from the clean source tree, the GCC plugins do not exist at this point. 987 988# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 989KBUILD_CPPFLAGS += $(KCPPFLAGS) 990KBUILD_AFLAGS += $(KAFLAGS) 991KBUILD_CFLAGS += $(KCFLAGS) 992 993KBUILD_LDFLAGS_MODULE += --build-id=sha1 994LDFLAGS_vmlinux += --build-id=sha1 995 996ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 997LDFLAGS_vmlinux += $(call ld-option, -X,) 998endif 999 1000ifeq ($(CONFIG_RELR),y) 1001LDFLAGS_vmlinux += --pack-dyn-relocs=relr 1002endif 1003 1004# We never want expected sections to be placed heuristically by the 1005# linker. All sections should be explicitly named in the linker script. 1006ifdef CONFIG_LD_ORPHAN_WARN 1007LDFLAGS_vmlinux += --orphan-handling=warn 1008endif 1009 1010# Align the bit size of userspace programs with the kernel 1011KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1012KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1013 1014# make the checker run with the right architecture 1015CHECKFLAGS += --arch=$(ARCH) 1016 1017# insure the checker run with the right endianness 1018CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1019 1020# the checker needs the correct machine size 1021CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1022 1023# Default kernel image to build when no specific target is given. 1024# KBUILD_IMAGE may be overruled on the command line or 1025# set in the environment 1026# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1027# this default value 1028export KBUILD_IMAGE ?= vmlinux 1029 1030# 1031# INSTALL_PATH specifies where to place the updated kernel and system map 1032# images. Default is /boot, but you can set it to other values 1033export INSTALL_PATH ?= /boot 1034 1035# 1036# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1037# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1038# an argument if needed. Otherwise it defaults to the kernel install path 1039# 1040export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1041 1042# 1043# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1044# relocations required by build roots. This is not defined in the 1045# makefile but the argument can be passed to make if needed. 1046# 1047 1048MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1049export MODLIB 1050 1051# 1052# INSTALL_MOD_STRIP, if defined, will cause modules to be 1053# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1054# the default option --strip-debug will be used. Otherwise, 1055# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1056 1057ifdef INSTALL_MOD_STRIP 1058ifeq ($(INSTALL_MOD_STRIP),1) 1059mod_strip_cmd = $(STRIP) --strip-debug 1060else 1061mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1062endif # INSTALL_MOD_STRIP=1 1063else 1064mod_strip_cmd = true 1065endif # INSTALL_MOD_STRIP 1066export mod_strip_cmd 1067 1068# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1069# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1070# or CONFIG_MODULE_COMPRESS_XZ. 1071 1072mod_compress_cmd = true 1073ifdef CONFIG_MODULE_COMPRESS 1074 ifdef CONFIG_MODULE_COMPRESS_GZIP 1075 mod_compress_cmd = $(KGZIP) -n -f 1076 endif # CONFIG_MODULE_COMPRESS_GZIP 1077 ifdef CONFIG_MODULE_COMPRESS_XZ 1078 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f 1079 endif # CONFIG_MODULE_COMPRESS_XZ 1080endif # CONFIG_MODULE_COMPRESS 1081export mod_compress_cmd 1082 1083ifdef CONFIG_MODULE_SIG_ALL 1084$(eval $(call config_filename,MODULE_SIG_KEY)) 1085 1086mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1087else 1088mod_sign_cmd = true 1089endif 1090export mod_sign_cmd 1091 1092HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1093 1094has_libelf = $(call try-run,\ 1095 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1096 1097ifdef CONFIG_STACK_VALIDATION 1098 ifeq ($(has_libelf),1) 1099 objtool_target := tools/objtool FORCE 1100 else 1101 SKIP_STACK_VALIDATION := 1 1102 export SKIP_STACK_VALIDATION 1103 endif 1104endif 1105 1106PHONY += resolve_btfids_clean 1107 1108resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1109 1110# tools/bpf/resolve_btfids directory might not exist 1111# in output directory, skip its clean in that case 1112resolve_btfids_clean: 1113ifneq ($(wildcard $(resolve_btfids_O)),) 1114 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1115endif 1116 1117ifdef CONFIG_BPF 1118ifdef CONFIG_DEBUG_INFO_BTF 1119 ifeq ($(has_libelf),1) 1120 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1121 else 1122 ERROR_RESOLVE_BTFIDS := 1 1123 endif 1124endif # CONFIG_DEBUG_INFO_BTF 1125endif # CONFIG_BPF 1126 1127PHONY += prepare0 1128 1129extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1130export MODORDER := $(extmod-prefix)modules.order 1131export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1132 1133ifeq ($(KBUILD_EXTMOD),) 1134core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1135 1136vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1137 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1138 $(libs-y) $(libs-m))) 1139 1140vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1141 $(patsubst %/,%,$(filter %/, $(core-) \ 1142 $(drivers-) $(libs-)))) 1143 1144subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1145 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1146 $(drivers-y) $(drivers-m))) 1147 1148build-dirs := $(vmlinux-dirs) 1149clean-dirs := $(vmlinux-alldirs) 1150 1151# Externally visible symbols (used by link-vmlinux.sh) 1152KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1153KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1154ifdef CONFIG_MODULES 1155KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1156KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1157else 1158KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1159endif 1160KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1161 1162export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1163export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1164# used by scripts/Makefile.package 1165export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1166 1167vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1168 1169# Recurse until adjust_autoksyms.sh is satisfied 1170PHONY += autoksyms_recursive 1171ifdef CONFIG_TRIM_UNUSED_KSYMS 1172# For the kernel to actually contain only the needed exported symbols, 1173# we have to build modules as well to determine what those symbols are. 1174# (this can be evaluated only once include/config/auto.conf has been included) 1175KBUILD_MODULES := 1 1176 1177autoksyms_recursive: descend modules.order 1178 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1179 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1180endif 1181 1182autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1183 1184quiet_cmd_autoksyms_h = GEN $@ 1185 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1186 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1187 1188$(autoksyms_h): 1189 $(call cmd,autoksyms_h) 1190 1191ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1192 1193# Final link of vmlinux with optional arch pass after final link 1194cmd_link-vmlinux = \ 1195 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1196 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1197 1198vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1199 +$(call if_changed,link-vmlinux) 1200 1201targets := vmlinux 1202 1203# The actual objects are generated when descending, 1204# make sure no implicit rule kicks in 1205$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1206 1207filechk_kernel.release = \ 1208 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1209 1210# Store (new) KERNELRELEASE string in include/config/kernel.release 1211include/config/kernel.release: FORCE 1212 $(call filechk,kernel.release) 1213 1214# Additional helpers built in scripts/ 1215# Carefully list dependencies so we do not try to build scripts twice 1216# in parallel 1217PHONY += scripts 1218scripts: scripts_basic scripts_dtc 1219 $(Q)$(MAKE) $(build)=$(@) 1220 1221# Things we need to do before we recursively start building the kernel 1222# or the modules are listed in "prepare". 1223# A multi level approach is used. prepareN is processed before prepareN-1. 1224# archprepare is used in arch Makefiles and when processed asm symlink, 1225# version.h and scripts_basic is processed / created. 1226 1227PHONY += prepare archprepare 1228 1229archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1230 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1231 include/generated/autoconf.h 1232 1233prepare0: archprepare 1234 $(Q)$(MAKE) $(build)=scripts/mod 1235 $(Q)$(MAKE) $(build)=. 1236 1237# All the preparing.. 1238prepare: prepare0 prepare-objtool prepare-resolve_btfids 1239 1240# Support for using generic headers in asm-generic 1241asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1242 1243PHONY += asm-generic uapi-asm-generic 1244asm-generic: uapi-asm-generic 1245 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1246 generic=include/asm-generic 1247uapi-asm-generic: 1248 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1249 generic=include/uapi/asm-generic 1250 1251PHONY += prepare-objtool prepare-resolve_btfids 1252prepare-objtool: $(objtool_target) 1253ifeq ($(SKIP_STACK_VALIDATION),1) 1254ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1255 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1256 @false 1257endif 1258ifdef CONFIG_UNWINDER_ORC 1259 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1260 @false 1261else 1262 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1263endif 1264endif 1265 1266prepare-resolve_btfids: $(resolve_btfids_target) 1267ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1268 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1269 @false 1270endif 1271# Generate some files 1272# --------------------------------------------------------------------------- 1273 1274# KERNELRELEASE can change from a few different places, meaning version.h 1275# needs to be updated, so this check is forced on all builds 1276 1277uts_len := 64 1278define filechk_utsrelease.h 1279 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1280 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1281 exit 1; \ 1282 fi; \ 1283 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1284endef 1285 1286define filechk_version.h 1287 if [ $(SUBLEVEL) -gt 255 ]; then \ 1288 echo \#define LINUX_VERSION_CODE $(shell \ 1289 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1290 else \ 1291 echo \#define LINUX_VERSION_CODE $(shell \ 1292 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1293 fi; \ 1294 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1295 ((c) > 255 ? 255 : (c)))'; \ 1296 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1297 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1298 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1299endef 1300 1301$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1302$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1303$(version_h): FORCE 1304 $(call filechk,version.h) 1305 1306include/generated/utsrelease.h: include/config/kernel.release FORCE 1307 $(call filechk,utsrelease.h) 1308 1309PHONY += headerdep 1310headerdep: 1311 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1312 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1313 1314# --------------------------------------------------------------------------- 1315# Kernel headers 1316 1317#Default location for installed headers 1318export INSTALL_HDR_PATH = $(objtree)/usr 1319 1320quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1321 cmd_headers_install = \ 1322 mkdir -p $(INSTALL_HDR_PATH); \ 1323 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1324 usr/include $(INSTALL_HDR_PATH) 1325 1326PHONY += headers_install 1327headers_install: headers 1328 $(call cmd,headers_install) 1329 1330PHONY += archheaders archscripts 1331 1332hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1333 1334PHONY += headers 1335headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1336 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1337 $(error Headers not exportable for the $(SRCARCH) architecture)) 1338 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1339 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1340 1341# Deprecated. It is no-op now. 1342PHONY += headers_check 1343headers_check: 1344 @: 1345 1346ifdef CONFIG_HEADERS_INSTALL 1347prepare: headers 1348endif 1349 1350PHONY += scripts_unifdef 1351scripts_unifdef: scripts_basic 1352 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1353 1354# --------------------------------------------------------------------------- 1355# Kernel selftest 1356 1357PHONY += kselftest 1358kselftest: 1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1360 1361kselftest-%: FORCE 1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1363 1364PHONY += kselftest-merge 1365kselftest-merge: 1366 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1367 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1368 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1369 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1370 1371# --------------------------------------------------------------------------- 1372# Devicetree files 1373 1374ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1375dtstree := arch/$(SRCARCH)/boot/dts 1376endif 1377 1378ifneq ($(dtstree),) 1379 1380%.dtb: include/config/kernel.release scripts_dtc 1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1382 1383%.dtbo: include/config/kernel.release scripts_dtc 1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1385 1386PHONY += dtbs dtbs_install dtbs_check 1387dtbs: include/config/kernel.release scripts_dtc 1388 $(Q)$(MAKE) $(build)=$(dtstree) 1389 1390ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1391export CHECK_DTBS=y 1392dtbs: dt_binding_check 1393endif 1394 1395dtbs_check: dtbs 1396 1397dtbs_install: 1398 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1399 1400ifdef CONFIG_OF_EARLY_FLATTREE 1401all: dtbs 1402endif 1403 1404endif 1405 1406PHONY += scripts_dtc 1407scripts_dtc: scripts_basic 1408 $(Q)$(MAKE) $(build)=scripts/dtc 1409 1410ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1411export CHECK_DT_BINDING=y 1412endif 1413 1414PHONY += dt_binding_check 1415dt_binding_check: scripts_dtc 1416 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1417 1418# --------------------------------------------------------------------------- 1419# Modules 1420 1421ifdef CONFIG_MODULES 1422 1423# By default, build modules as well 1424 1425all: modules 1426 1427# When we're building modules with modversions, we need to consider 1428# the built-in objects during the descend as well, in order to 1429# make sure the checksums are up to date before we record them. 1430ifdef CONFIG_MODVERSIONS 1431 KBUILD_BUILTIN := 1 1432endif 1433 1434# Build modules 1435# 1436# A module can be listed more than once in obj-m resulting in 1437# duplicate lines in modules.order files. Those are removed 1438# using awk while concatenating to the final file. 1439 1440PHONY += modules 1441modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1442 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1443 1444PHONY += modules_check 1445modules_check: modules.order 1446 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1447 1448cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1449 1450modules.order: $(subdir-modorder) FORCE 1451 $(call if_changed,modules_order) 1452 1453targets += modules.order 1454 1455# Target to prepare building external modules 1456PHONY += modules_prepare 1457modules_prepare: prepare 1458 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1459 1460# Target to install modules 1461PHONY += modules_install 1462modules_install: _modinst_ _modinst_post 1463 1464PHONY += _modinst_ 1465_modinst_: 1466 @rm -rf $(MODLIB)/kernel 1467 @rm -f $(MODLIB)/source 1468 @mkdir -p $(MODLIB)/kernel 1469 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1470 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1471 rm -f $(MODLIB)/build ; \ 1472 ln -s $(CURDIR) $(MODLIB)/build ; \ 1473 fi 1474 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1475 @cp -f modules.builtin $(MODLIB)/ 1476 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1477 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1478 1479# This depmod is only for convenience to give the initial 1480# boot a modules.dep even before / is mounted read-write. However the 1481# boot script depmod is the master version. 1482PHONY += _modinst_post 1483_modinst_post: _modinst_ 1484 $(call cmd,depmod) 1485 1486ifeq ($(CONFIG_MODULE_SIG), y) 1487PHONY += modules_sign 1488modules_sign: 1489 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1490endif 1491 1492else # CONFIG_MODULES 1493 1494# Modules not configured 1495# --------------------------------------------------------------------------- 1496 1497PHONY += modules modules_install 1498modules modules_install: 1499 @echo >&2 1500 @echo >&2 "The present kernel configuration has modules disabled." 1501 @echo >&2 "Type 'make config' and enable loadable module support." 1502 @echo >&2 "Then build a kernel with module support enabled." 1503 @echo >&2 1504 @exit 1 1505 1506endif # CONFIG_MODULES 1507 1508### 1509# Cleaning is done on three levels. 1510# make clean Delete most generated files 1511# Leave enough to build external modules 1512# make mrproper Delete the current configuration, and all generated files 1513# make distclean Remove editor backup files, patch leftover files and the like 1514 1515# Directories & files removed with 'make clean' 1516CLEAN_FILES += include/ksym vmlinux.symvers \ 1517 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1518 compile_commands.json .thinlto-cache 1519 1520# Directories & files removed with 'make mrproper' 1521MRPROPER_FILES += include/config include/generated \ 1522 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1523 debian snap tar-install \ 1524 .config .config.old .version \ 1525 Module.symvers \ 1526 signing_key.pem signing_key.priv signing_key.x509 \ 1527 x509.genkey extra_certificates signing_key.x509.keyid \ 1528 signing_key.x509.signer vmlinux-gdb.py \ 1529 *.spec 1530 1531# Directories & files removed with 'make distclean' 1532DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1533 1534# clean - Delete most, but leave enough to build external modules 1535# 1536clean: rm-files := $(CLEAN_FILES) 1537 1538PHONY += archclean vmlinuxclean 1539 1540vmlinuxclean: 1541 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1542 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1543 1544clean: archclean vmlinuxclean resolve_btfids_clean 1545 1546# mrproper - Delete all generated files, including .config 1547# 1548mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1549mrproper-dirs := $(addprefix _mrproper_,scripts) 1550 1551PHONY += $(mrproper-dirs) mrproper 1552$(mrproper-dirs): 1553 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1554 1555mrproper: clean $(mrproper-dirs) 1556 $(call cmd,rmfiles) 1557 1558# distclean 1559# 1560distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1561 1562PHONY += distclean 1563 1564distclean: mrproper 1565 $(call cmd,rmfiles) 1566 @find $(srctree) $(RCS_FIND_IGNORE) \ 1567 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1568 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1569 -o -name 'core' \) \ 1570 -type f -print | xargs rm -f 1571 1572 1573# Packaging of the kernel to various formats 1574# --------------------------------------------------------------------------- 1575 1576%src-pkg: FORCE 1577 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1578%pkg: include/config/kernel.release FORCE 1579 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1580 1581# Brief documentation of the typical targets used 1582# --------------------------------------------------------------------------- 1583 1584boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1585boards := $(sort $(notdir $(boards))) 1586board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1587board-dirs := $(sort $(notdir $(board-dirs:/=))) 1588 1589PHONY += help 1590help: 1591 @echo 'Cleaning targets:' 1592 @echo ' clean - Remove most generated files but keep the config and' 1593 @echo ' enough build support to build external modules' 1594 @echo ' mrproper - Remove all generated files + config + various backup files' 1595 @echo ' distclean - mrproper + remove editor backup and patch files' 1596 @echo '' 1597 @echo 'Configuration targets:' 1598 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1599 @echo '' 1600 @echo 'Other generic targets:' 1601 @echo ' all - Build all targets marked with [*]' 1602 @echo '* vmlinux - Build the bare kernel' 1603 @echo '* modules - Build all modules' 1604 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1605 @echo ' dir/ - Build all files in dir and below' 1606 @echo ' dir/file.[ois] - Build specified target only' 1607 @echo ' dir/file.ll - Build the LLVM assembly file' 1608 @echo ' (requires compiler support for LLVM assembly generation)' 1609 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1610 @echo ' (requires a recent binutils and recent build (System.map))' 1611 @echo ' dir/file.ko - Build module including final link' 1612 @echo ' modules_prepare - Set up for building external modules' 1613 @echo ' tags/TAGS - Generate tags file for editors' 1614 @echo ' cscope - Generate cscope index' 1615 @echo ' gtags - Generate GNU GLOBAL index' 1616 @echo ' kernelrelease - Output the release version string (use with make -s)' 1617 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1618 @echo ' image_name - Output the image name (use with make -s)' 1619 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1620 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1621 echo '' 1622 @echo 'Static analysers:' 1623 @echo ' checkstack - Generate a list of stack hogs' 1624 @echo ' versioncheck - Sanity check on version.h usage' 1625 @echo ' includecheck - Check for duplicate included header files' 1626 @echo ' export_report - List the usages of all exported symbols' 1627 @echo ' headerdep - Detect inclusion cycles in headers' 1628 @echo ' coccicheck - Check with Coccinelle' 1629 @echo ' clang-analyzer - Check with clang static analyzer' 1630 @echo ' clang-tidy - Check with clang-tidy' 1631 @echo '' 1632 @echo 'Tools:' 1633 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1634 @echo '' 1635 @echo 'Kernel selftest:' 1636 @echo ' kselftest - Build and run kernel selftest' 1637 @echo ' Build, install, and boot kernel before' 1638 @echo ' running kselftest on it' 1639 @echo ' Run as root for full coverage' 1640 @echo ' kselftest-all - Build kernel selftest' 1641 @echo ' kselftest-install - Build and install kernel selftest' 1642 @echo ' kselftest-clean - Remove all generated kselftest files' 1643 @echo ' kselftest-merge - Merge all the config dependencies of' 1644 @echo ' kselftest to existing .config.' 1645 @echo '' 1646 @$(if $(dtstree), \ 1647 echo 'Devicetree:'; \ 1648 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1649 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1650 echo ' dt_binding_check - Validate device tree binding documents'; \ 1651 echo ' dtbs_check - Validate device tree source files';\ 1652 echo '') 1653 1654 @echo 'Userspace tools targets:' 1655 @echo ' use "make tools/help"' 1656 @echo ' or "cd tools; make help"' 1657 @echo '' 1658 @echo 'Kernel packaging:' 1659 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1660 @echo '' 1661 @echo 'Documentation targets:' 1662 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1663 @echo '' 1664 @echo 'Architecture specific targets ($(SRCARCH)):' 1665 @$(if $(archhelp),$(archhelp),\ 1666 echo ' No architecture specific help defined for $(SRCARCH)') 1667 @echo '' 1668 @$(if $(boards), \ 1669 $(foreach b, $(boards), \ 1670 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1671 echo '') 1672 @$(if $(board-dirs), \ 1673 $(foreach b, $(board-dirs), \ 1674 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1675 printf " %-16s - Show all of the above\\n" help-boards; \ 1676 echo '') 1677 1678 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1679 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1680 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1681 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1682 @echo ' (sparse by default)' 1683 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1684 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1685 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1686 @echo ' 1: warnings which may be relevant and do not occur too often' 1687 @echo ' 2: warnings which occur quite often but may still be relevant' 1688 @echo ' 3: more obscure warnings, can most likely be ignored' 1689 @echo ' Multiple levels can be combined with W=12 or W=123' 1690 @echo '' 1691 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1692 @echo 'For further info see the ./README file' 1693 1694 1695help-board-dirs := $(addprefix help-,$(board-dirs)) 1696 1697help-boards: $(help-board-dirs) 1698 1699boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1700 1701$(help-board-dirs): help-%: 1702 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1703 @$(if $(boards-per-dir), \ 1704 $(foreach b, $(boards-per-dir), \ 1705 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1706 echo '') 1707 1708 1709# Documentation targets 1710# --------------------------------------------------------------------------- 1711DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1712 linkcheckdocs dochelp refcheckdocs 1713PHONY += $(DOC_TARGETS) 1714$(DOC_TARGETS): 1715 $(Q)$(MAKE) $(build)=Documentation $@ 1716 1717# Misc 1718# --------------------------------------------------------------------------- 1719 1720PHONY += scripts_gdb 1721scripts_gdb: prepare0 1722 $(Q)$(MAKE) $(build)=scripts/gdb 1723 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1724 1725ifdef CONFIG_GDB_SCRIPTS 1726all: scripts_gdb 1727endif 1728 1729else # KBUILD_EXTMOD 1730 1731### 1732# External module support. 1733# When building external modules the kernel used as basis is considered 1734# read-only, and no consistency checks are made and the make 1735# system is not used on the basis kernel. If updates are required 1736# in the basis kernel ordinary make commands (without M=...) must 1737# be used. 1738# 1739# The following are the only valid targets when building external 1740# modules. 1741# make M=dir clean Delete all automatically generated files 1742# make M=dir modules Make all modules in specified dir 1743# make M=dir Same as 'make M=dir modules' 1744# make M=dir modules_install 1745# Install the modules built in the module directory 1746# Assumes install directory is already created 1747 1748# We are always building only modules. 1749KBUILD_BUILTIN := 1750KBUILD_MODULES := 1 1751 1752build-dirs := $(KBUILD_EXTMOD) 1753PHONY += modules 1754modules: $(MODORDER) 1755 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1756 1757$(MODORDER): descend 1758 @: 1759 1760PHONY += modules_install 1761modules_install: _emodinst_ _emodinst_post 1762 1763install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1764PHONY += _emodinst_ 1765_emodinst_: 1766 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1767 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1768 1769PHONY += _emodinst_post 1770_emodinst_post: _emodinst_ 1771 $(call cmd,depmod) 1772 1773compile_commands.json: $(extmod-prefix)compile_commands.json 1774PHONY += compile_commands.json 1775 1776clean-dirs := $(KBUILD_EXTMOD) 1777clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1778 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1779 1780PHONY += help 1781help: 1782 @echo ' Building external modules.' 1783 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1784 @echo '' 1785 @echo ' modules - default target, build the module(s)' 1786 @echo ' modules_install - install the module' 1787 @echo ' clean - remove generated files in module directory only' 1788 @echo '' 1789 1790# no-op for external module builds 1791PHONY += prepare modules_prepare 1792 1793endif # KBUILD_EXTMOD 1794 1795# Single targets 1796# --------------------------------------------------------------------------- 1797# To build individual files in subdirectories, you can do like this: 1798# 1799# make foo/bar/baz.s 1800# 1801# The supported suffixes for single-target are listed in 'single-targets' 1802# 1803# To build only under specific subdirectories, you can do like this: 1804# 1805# make foo/bar/baz/ 1806 1807ifdef single-build 1808 1809# .ko is special because modpost is needed 1810single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1811single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1812 1813$(single-ko): single_modpost 1814 @: 1815$(single-no-ko): descend 1816 @: 1817 1818ifeq ($(KBUILD_EXTMOD),) 1819# For the single build of in-tree modules, use a temporary file to avoid 1820# the situation of modules_install installing an invalid modules.order. 1821MODORDER := .modules.tmp 1822endif 1823 1824PHONY += single_modpost 1825single_modpost: $(single-no-ko) modules_prepare 1826 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1827 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1828 1829KBUILD_MODULES := 1 1830 1831export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1832 1833# trim unrelated directories 1834build-dirs := $(foreach d, $(build-dirs), \ 1835 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1836 1837endif 1838 1839ifndef CONFIG_MODULES 1840KBUILD_MODULES := 1841endif 1842 1843# Handle descending into subdirectories listed in $(build-dirs) 1844# Preset locale variables to speed up the build process. Limit locale 1845# tweaks to this spot to avoid wrong language settings when running 1846# make menuconfig etc. 1847# Error messages still appears in the original language 1848PHONY += descend $(build-dirs) 1849descend: $(build-dirs) 1850$(build-dirs): prepare 1851 $(Q)$(MAKE) $(build)=$@ \ 1852 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1853 need-builtin=1 need-modorder=1 1854 1855clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1856PHONY += $(clean-dirs) clean 1857$(clean-dirs): 1858 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1859 1860clean: $(clean-dirs) 1861 $(call cmd,rmfiles) 1862 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1863 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1864 -o -name '*.ko.*' \ 1865 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1866 -o -name '*.dwo' -o -name '*.lst' \ 1867 -o -name '*.su' -o -name '*.mod' \ 1868 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1869 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1870 -o -name '*.asn1.[ch]' \ 1871 -o -name '*.symtypes' -o -name 'modules.order' \ 1872 -o -name '.tmp_*.o.*' \ 1873 -o -name '*.c.[012]*.*' \ 1874 -o -name '*.ll' \ 1875 -o -name '*.gcno' \ 1876 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1877 1878# Generate tags for editors 1879# --------------------------------------------------------------------------- 1880quiet_cmd_tags = GEN $@ 1881 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1882 1883tags TAGS cscope gtags: FORCE 1884 $(call cmd,tags) 1885 1886# Script to generate missing namespace dependencies 1887# --------------------------------------------------------------------------- 1888 1889PHONY += nsdeps 1890nsdeps: export KBUILD_NSDEPS=1 1891nsdeps: modules 1892 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1893 1894# Clang Tooling 1895# --------------------------------------------------------------------------- 1896 1897quiet_cmd_gen_compile_commands = GEN $@ 1898 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1899 1900$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1901 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1902 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1903 $(call if_changed,gen_compile_commands) 1904 1905targets += $(extmod-prefix)compile_commands.json 1906 1907PHONY += clang-tidy clang-analyzer 1908 1909ifdef CONFIG_CC_IS_CLANG 1910quiet_cmd_clang_tools = CHECK $< 1911 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1912 1913clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1914 $(call cmd,clang_tools) 1915else 1916clang-tidy clang-analyzer: 1917 @echo "$@ requires CC=clang" >&2 1918 @false 1919endif 1920 1921# Scripts to check various things for consistency 1922# --------------------------------------------------------------------------- 1923 1924PHONY += includecheck versioncheck coccicheck export_report 1925 1926includecheck: 1927 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1928 -name '*.[hcS]' -type f -print | sort \ 1929 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1930 1931versioncheck: 1932 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1933 -name '*.[hcS]' -type f -print | sort \ 1934 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1935 1936coccicheck: 1937 $(Q)$(BASH) $(srctree)/scripts/$@ 1938 1939export_report: 1940 $(PERL) $(srctree)/scripts/export_report.pl 1941 1942PHONY += checkstack kernelrelease kernelversion image_name 1943 1944# UML needs a little special treatment here. It wants to use the host 1945# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1946# else wants $(ARCH), including people doing cross-builds, which means 1947# that $(SUBARCH) doesn't work here. 1948ifeq ($(ARCH), um) 1949CHECKSTACK_ARCH := $(SUBARCH) 1950else 1951CHECKSTACK_ARCH := $(ARCH) 1952endif 1953checkstack: 1954 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1955 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1956 1957kernelrelease: 1958 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1959 1960kernelversion: 1961 @echo $(KERNELVERSION) 1962 1963image_name: 1964 @echo $(KBUILD_IMAGE) 1965 1966# Clear a bunch of variables before executing the submake 1967 1968ifeq ($(quiet),silent_) 1969tools_silent=s 1970endif 1971 1972tools/: FORCE 1973 $(Q)mkdir -p $(objtree)/tools 1974 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1975 1976tools/%: FORCE 1977 $(Q)mkdir -p $(objtree)/tools 1978 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1979 1980quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1981 cmd_rmfiles = rm -rf $(rm-files) 1982 1983# Run depmod only if we have System.map and depmod is executable 1984quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1985 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1986 $(KERNELRELEASE) 1987 1988# read saved command lines for existing targets 1989existing-targets := $(wildcard $(sort $(targets))) 1990 1991-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1992 1993endif # config-build 1994endif # mixed-build 1995endif # need-sub-make 1996 1997PHONY += FORCE 1998FORCE: 1999 2000# Declare the contents of the PHONY variable as phony. We keep that 2001# information in a variable so we can use it in if_changed and friends. 2002.PHONY: $(PHONY) 2003