1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 13 4SUBLEVEL = 19 5EXTRAVERSION = 6NAME = Opossums on Parade 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 $(error building multiple external modules is not supported)) 131 132# Remove trailing slashes 133ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135endif 136 137export KBUILD_EXTMOD 138 139# Kbuild will save output files in the current working directory. 140# This does not need to match to the root of the kernel source tree. 141# 142# For example, you can do this: 143# 144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145# 146# If you want to save output files in a different location, there are 147# two syntaxes to specify it. 148# 149# 1) O= 150# Use "make O=dir/to/store/output/files/" 151# 152# 2) Set KBUILD_OUTPUT 153# Set the environment variable KBUILD_OUTPUT to point to the output directory. 154# export KBUILD_OUTPUT=dir/to/store/output/files/; make 155# 156# The O= assignment takes precedence over the KBUILD_OUTPUT environment 157# variable. 158 159# Do we want to change the working directory? 160ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162endif 163 164ifneq ($(KBUILD_OUTPUT),) 165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166# expand a shell special character '~'. We use a somewhat tedious way here. 167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168$(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171# $(realpath ...) resolves symlinks 172abs_objtree := $(realpath $(abs_objtree)) 173else 174abs_objtree := $(CURDIR) 175endif # ifneq ($(KBUILD_OUTPUT),) 176 177ifeq ($(abs_objtree),$(CURDIR)) 178# Suppress "Entering directory ..." unless we are changing the work directory. 179MAKEFLAGS += --no-print-directory 180else 181need-sub-make := 1 182endif 183 184this-makefile := $(lastword $(MAKEFILE_LIST)) 185abs_srctree := $(realpath $(dir $(this-makefile))) 186 187ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188$(error source directory cannot contain spaces or colons) 189endif 190 191ifneq ($(abs_srctree),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# This does not become effective immediately because MAKEFLAGS is re-parsed 195# once after the Makefile is read. We need to invoke sub-make. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197need-sub-make := 1 198endif 199 200ifneq ($(filter 3.%,$(MAKE_VERSION)),) 201# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 202# We need to invoke sub-make to avoid implicit rules in the top Makefile. 203need-sub-make := 1 204# Cancel implicit rules for this Makefile. 205$(this-makefile): ; 206endif 207 208export abs_srctree abs_objtree 209export sub_make_done := 1 210 211ifeq ($(need-sub-make),1) 212 213PHONY += $(MAKECMDGOALS) __sub-make 214 215$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 216 @: 217 218# Invoke a second make in the output directory, passing relevant variables 219__sub-make: 220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 221 222endif # need-sub-make 223endif # sub_make_done 224 225# We process the rest of the Makefile if this is the final invocation of make 226ifeq ($(need-sub-make),) 227 228# Do not print "Entering directory ...", 229# but we want to display it when entering to the output directory 230# so that IDEs/editors are able to understand relative filenames. 231MAKEFLAGS += --no-print-directory 232 233ifeq ($(abs_srctree),$(abs_objtree)) 234 # building in the source tree 235 srctree := . 236 building_out_of_srctree := 237else 238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 239 # building in a subdirectory of the source tree 240 srctree := .. 241 else 242 srctree := $(abs_srctree) 243 endif 244 building_out_of_srctree := 1 245endif 246 247ifneq ($(KBUILD_ABS_SRCTREE),) 248srctree := $(abs_srctree) 249endif 250 251objtree := . 252VPATH := $(srctree) 253 254export building_out_of_srctree srctree objtree VPATH 255 256# To make sure we do not include .config for any of the *config targets 257# catch them early, and hand them over to scripts/kconfig/Makefile 258# It is allowed to specify more targets when calling make, including 259# mixing *config targets and build targets. 260# For example 'make oldconfig all'. 261# Detect when mixed targets is specified, and make a second invocation 262# of make so .config is not included in this case either (for *config). 263 264version_h := include/generated/uapi/linux/version.h 265 266clean-targets := %clean mrproper cleandocs 267no-dot-config-targets := $(clean-targets) \ 268 cscope gtags TAGS tags help% %docs check% coccicheck \ 269 $(version_h) headers headers_% archheaders archscripts \ 270 %asm-generic kernelversion %src-pkg dt_binding_check \ 271 outputmakefile 272# Installation targets should not require compiler. Unfortunately, vdso_install 273# is an exception where build artifacts may be updated. This must be fixed. 274no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 275 headers_install modules_install kernelrelease image_name 276no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 277 image_name 278single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 279 280config-build := 281mixed-build := 282need-config := 1 283need-compiler := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 295 need-compiler := 296 endif 297endif 298 299ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 301 may-sync-config := 302 endif 303endif 304 305ifneq ($(KBUILD_EXTMOD),) 306 may-sync-config := 307endif 308 309ifeq ($(KBUILD_EXTMOD),) 310 ifneq ($(filter %config,$(MAKECMDGOALS)),) 311 config-build := 1 312 ifneq ($(words $(MAKECMDGOALS)),1) 313 mixed-build := 1 314 endif 315 endif 316endif 317 318# We cannot build single targets and the others at the same time 319ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 320 single-build := 1 321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 322 mixed-build := 1 323 endif 324endif 325 326# For "make -j clean all", "make -j mrproper defconfig all", etc. 327ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 329 mixed-build := 1 330 endif 331endif 332 333# install and modules_install need also be processed one by one 334ifneq ($(filter install,$(MAKECMDGOALS)),) 335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 336 mixed-build := 1 337 endif 338endif 339 340ifdef mixed-build 341# =========================================================================== 342# We're called with mixed targets (*config and build targets). 343# Handle them one by one. 344 345PHONY += $(MAKECMDGOALS) __build_one_by_one 346 347$(MAKECMDGOALS): __build_one_by_one 348 @: 349 350__build_one_by_one: 351 $(Q)set -e; \ 352 for i in $(MAKECMDGOALS); do \ 353 $(MAKE) -f $(srctree)/Makefile $$i; \ 354 done 355 356else # !mixed-build 357 358include $(srctree)/scripts/Kbuild.include 359 360# Read KERNELRELEASE from include/config/kernel.release (if it exists) 361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 362KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 364 365include $(srctree)/scripts/subarch.include 366 367# Cross compiling and selecting different set of gcc/bin-utils 368# --------------------------------------------------------------------------- 369# 370# When performing cross compilation for other architectures ARCH shall be set 371# to the target architecture. (See arch/* for the possibilities). 372# ARCH can be set during invocation of make: 373# make ARCH=ia64 374# Another way is to have ARCH set in the environment. 375# The default ARCH is the host where make is executed. 376 377# CROSS_COMPILE specify the prefix used for all executables used 378# during compilation. Only gcc and related bin-utils executables 379# are prefixed with $(CROSS_COMPILE). 380# CROSS_COMPILE can be set on the command line 381# make CROSS_COMPILE=ia64-linux- 382# Alternatively CROSS_COMPILE can be set in the environment. 383# Default value for CROSS_COMPILE is not to prefix executables 384# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 385ARCH ?= $(SUBARCH) 386 387# Architecture as present in compile.h 388UTS_MACHINE := $(ARCH) 389SRCARCH := $(ARCH) 390 391# Additional ARCH settings for x86 392ifeq ($(ARCH),i386) 393 SRCARCH := x86 394endif 395ifeq ($(ARCH),x86_64) 396 SRCARCH := x86 397endif 398 399# Additional ARCH settings for sparc 400ifeq ($(ARCH),sparc32) 401 SRCARCH := sparc 402endif 403ifeq ($(ARCH),sparc64) 404 SRCARCH := sparc 405endif 406 407# Additional ARCH settings for parisc 408ifeq ($(ARCH),parisc64) 409 SRCARCH := parisc 410endif 411 412export cross_compiling := 413ifneq ($(SRCARCH),$(SUBARCH)) 414cross_compiling := 1 415endif 416 417KCONFIG_CONFIG ?= .config 418export KCONFIG_CONFIG 419 420# SHELL used by kbuild 421CONFIG_SHELL := sh 422 423HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 424HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 425HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 426 427ifneq ($(LLVM),) 428HOSTCC = clang 429HOSTCXX = clang++ 430else 431HOSTCC = gcc 432HOSTCXX = g++ 433endif 434 435export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 436 -O2 -fomit-frame-pointer -std=gnu89 437export KBUILD_USERLDFLAGS := 438 439KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 440KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 441KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 442KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 443 444# Make variables (CC, etc...) 445CPP = $(CC) -E 446ifneq ($(LLVM),) 447CC = clang 448LD = ld.lld 449AR = llvm-ar 450NM = llvm-nm 451OBJCOPY = llvm-objcopy 452OBJDUMP = llvm-objdump 453READELF = llvm-readelf 454STRIP = llvm-strip 455else 456CC = $(CROSS_COMPILE)gcc 457LD = $(CROSS_COMPILE)ld 458AR = $(CROSS_COMPILE)ar 459NM = $(CROSS_COMPILE)nm 460OBJCOPY = $(CROSS_COMPILE)objcopy 461OBJDUMP = $(CROSS_COMPILE)objdump 462READELF = $(CROSS_COMPILE)readelf 463STRIP = $(CROSS_COMPILE)strip 464endif 465PAHOLE = pahole 466RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 467LEX = flex 468YACC = bison 469AWK = awk 470INSTALLKERNEL := installkernel 471DEPMOD = depmod 472PERL = perl 473PYTHON3 = python3 474CHECK = sparse 475BASH = bash 476KGZIP = gzip 477KBZIP2 = bzip2 478KLZOP = lzop 479LZMA = lzma 480LZ4 = lz4c 481XZ = xz 482ZSTD = zstd 483 484CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 485 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 486NOSTDINC_FLAGS := 487CFLAGS_MODULE = 488AFLAGS_MODULE = 489LDFLAGS_MODULE = 490CFLAGS_KERNEL = 491AFLAGS_KERNEL = 492LDFLAGS_vmlinux = 493 494# Use USERINCLUDE when you must reference the UAPI directories only. 495USERINCLUDE := \ 496 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 497 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 498 -I$(srctree)/include/uapi \ 499 -I$(objtree)/include/generated/uapi \ 500 -include $(srctree)/include/linux/compiler-version.h \ 501 -include $(srctree)/include/linux/kconfig.h 502 503# Use LINUXINCLUDE when you must reference the include/ directory. 504# Needed to be compatible with the O= option 505LINUXINCLUDE := \ 506 -I$(srctree)/arch/$(SRCARCH)/include \ 507 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 508 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 509 -I$(objtree)/include \ 510 $(USERINCLUDE) 511 512KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 513KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 514 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 515 -Werror=implicit-function-declaration -Werror=implicit-int \ 516 -Werror=return-type -Wno-format-security \ 517 -std=gnu89 518KBUILD_CPPFLAGS := -D__KERNEL__ 519KBUILD_AFLAGS_KERNEL := 520KBUILD_CFLAGS_KERNEL := 521KBUILD_AFLAGS_MODULE := -DMODULE 522KBUILD_CFLAGS_MODULE := -DMODULE 523KBUILD_LDFLAGS_MODULE := 524KBUILD_LDFLAGS := 525CLANG_FLAGS := 526 527export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 528export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 529export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 530export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 531export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 532 533export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 534export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 535export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 536export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 537export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 538 539# Files to ignore in find ... statements 540 541export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 542 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 543 -prune -o 544export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 545 --exclude CVS --exclude .pc --exclude .hg --exclude .git 546 547# =========================================================================== 548# Rules shared between *config targets and build targets 549 550# Basic helpers built in scripts/basic/ 551PHONY += scripts_basic 552scripts_basic: 553 $(Q)$(MAKE) $(build)=scripts/basic 554 $(Q)rm -f .tmp_quiet_recordmcount 555 556PHONY += outputmakefile 557# Before starting out-of-tree build, make sure the source tree is clean. 558# outputmakefile generates a Makefile in the output directory, if using a 559# separate output directory. This allows convenient use of make in the 560# output directory. 561# At the same time when output Makefile generated, generate .gitignore to 562# ignore whole output directory 563outputmakefile: 564ifdef building_out_of_srctree 565 $(Q)if [ -f $(srctree)/.config -o \ 566 -d $(srctree)/include/config -o \ 567 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 568 echo >&2 "***"; \ 569 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 570 echo >&2 "*** in $(abs_srctree)";\ 571 echo >&2 "***"; \ 572 false; \ 573 fi 574 $(Q)ln -fsn $(srctree) source 575 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 576 $(Q)test -e .gitignore || \ 577 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 578endif 579 580# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 581# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 582# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 583# and from include/config/auto.conf.cmd to detect the compiler upgrade. 584CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 585 586ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 587ifneq ($(CROSS_COMPILE),) 588CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 589endif 590ifeq ($(LLVM_IAS),1) 591CLANG_FLAGS += -integrated-as 592else 593CLANG_FLAGS += -no-integrated-as 594GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 595CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 596endif 597CLANG_FLAGS += -Werror=unknown-warning-option 598KBUILD_CFLAGS += $(CLANG_FLAGS) 599KBUILD_AFLAGS += $(CLANG_FLAGS) 600export CLANG_FLAGS 601endif 602 603# Include this also for config targets because some architectures need 604# cc-cross-prefix to determine CROSS_COMPILE. 605ifdef need-compiler 606include $(srctree)/scripts/Makefile.compiler 607endif 608 609ifdef config-build 610# =========================================================================== 611# *config targets only - make sure prerequisites are updated, and descend 612# in scripts/kconfig to make the *config target 613 614# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 615# KBUILD_DEFCONFIG may point out an alternative default configuration 616# used for 'make defconfig' 617include $(srctree)/arch/$(SRCARCH)/Makefile 618export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 619 620config: outputmakefile scripts_basic FORCE 621 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 622 623%config: outputmakefile scripts_basic FORCE 624 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 625 626else #!config-build 627# =========================================================================== 628# Build targets only - this includes vmlinux, arch specific targets, clean 629# targets and others. In general all targets except *config targets. 630 631# If building an external module we do not care about the all: rule 632# but instead __all depend on modules 633PHONY += all 634ifeq ($(KBUILD_EXTMOD),) 635__all: all 636else 637__all: modules 638endif 639 640# Decide whether to build built-in, modular, or both. 641# Normally, just do built-in. 642 643KBUILD_MODULES := 644KBUILD_BUILTIN := 1 645 646# If we have only "make modules", don't compile built-in objects. 647ifeq ($(MAKECMDGOALS),modules) 648 KBUILD_BUILTIN := 649endif 650 651# If we have "make <whatever> modules", compile modules 652# in addition to whatever we do anyway. 653# Just "make" or "make all" shall build modules as well 654 655ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 656 KBUILD_MODULES := 1 657endif 658 659ifeq ($(MAKECMDGOALS),) 660 KBUILD_MODULES := 1 661endif 662 663export KBUILD_MODULES KBUILD_BUILTIN 664 665ifdef need-config 666include include/config/auto.conf 667endif 668 669ifeq ($(KBUILD_EXTMOD),) 670# Objects we will link into vmlinux / subdirs we need to visit 671core-y := init/ usr/ 672drivers-y := drivers/ sound/ 673drivers-$(CONFIG_SAMPLES) += samples/ 674drivers-$(CONFIG_NET) += net/ 675drivers-y += virt/ 676libs-y := lib/ 677endif # KBUILD_EXTMOD 678 679# The all: target is the default when no target is given on the 680# command line. 681# This allow a user to issue only 'make' to build a kernel including modules 682# Defaults to vmlinux, but the arch makefile usually adds further targets 683all: vmlinux 684 685CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 686 $(call cc-option,-fno-tree-loop-im) \ 687 $(call cc-disable-warning,maybe-uninitialized,) 688export CFLAGS_GCOV 689 690# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 691ifdef CONFIG_FUNCTION_TRACER 692 CC_FLAGS_FTRACE := -pg 693endif 694 695RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 696RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 697RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 698RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 699RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 700RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 701export RETPOLINE_CFLAGS 702export RETPOLINE_VDSO_CFLAGS 703 704include $(srctree)/arch/$(SRCARCH)/Makefile 705 706ifdef need-config 707ifdef may-sync-config 708# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 709# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 710# because some architectures define CROSS_COMPILE there. 711include include/config/auto.conf.cmd 712 713$(KCONFIG_CONFIG): 714 @echo >&2 '***' 715 @echo >&2 '*** Configuration file "$@" not found!' 716 @echo >&2 '***' 717 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 718 @echo >&2 '*** "make menuconfig" or "make xconfig").' 719 @echo >&2 '***' 720 @/bin/false 721 722# The actual configuration files used during the build are stored in 723# include/generated/ and include/config/. Update them if .config is newer than 724# include/config/auto.conf (which mirrors .config). 725# 726# This exploits the 'multi-target pattern rule' trick. 727# The syncconfig should be executed only once to make all the targets. 728# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 729# 730# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 731# so you cannot notice that Kconfig is waiting for the user input. 732%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 733 $(Q)$(kecho) " SYNC $@" 734 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 735else # !may-sync-config 736# External modules and some install targets need include/generated/autoconf.h 737# and include/config/auto.conf but do not care if they are up-to-date. 738# Use auto.conf to trigger the test 739PHONY += include/config/auto.conf 740 741include/config/auto.conf: 742 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 743 echo >&2; \ 744 echo >&2 " ERROR: Kernel configuration is invalid."; \ 745 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 746 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 747 echo >&2 ; \ 748 /bin/false) 749 750endif # may-sync-config 751endif # need-config 752 753KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 754KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 755KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 756KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 757KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 758 759ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 760KBUILD_CFLAGS += -O2 761else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 762KBUILD_CFLAGS += -O3 763else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 764KBUILD_CFLAGS += -Os 765endif 766 767# Tell gcc to never replace conditional load with a non-conditional one 768KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 769KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 770 771ifdef CONFIG_READABLE_ASM 772# Disable optimizations that make assembler listings hard to read. 773# reorder blocks reorders the control in the function 774# ipa clone creates specialized cloned functions 775# partial inlining inlines only parts of functions 776KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 777 $(call cc-option,-fno-ipa-cp-clone,) \ 778 $(call cc-option,-fno-partial-inlining) 779endif 780 781ifneq ($(CONFIG_FRAME_WARN),0) 782KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 783endif 784 785stackp-flags-y := -fno-stack-protector 786stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 787stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 788 789KBUILD_CFLAGS += $(stackp-flags-y) 790 791ifdef CONFIG_CC_IS_CLANG 792KBUILD_CPPFLAGS += -Qunused-arguments 793KBUILD_CFLAGS += -Wno-format-invalid-specifier 794KBUILD_CFLAGS += -Wno-gnu 795# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 796# source of a reference will be _MergedGlobals and not on of the whitelisted names. 797# See modpost pattern 2 798KBUILD_CFLAGS += -mno-global-merge 799else 800 801# Warn about unmarked fall-throughs in switch statement. 802# Disabled for clang while comment to attribute conversion happens and 803# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 804KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 805endif 806 807# These warnings generated too much noise in a regular build. 808# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 809KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 810 811KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 812ifdef CONFIG_FRAME_POINTER 813KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 814else 815# Some targets (ARM with Thumb2, for example), can't be built with frame 816# pointers. For those, we don't have FUNCTION_TRACER automatically 817# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 818# incompatible with -fomit-frame-pointer with current GCC, so we don't use 819# -fomit-frame-pointer with FUNCTION_TRACER. 820ifndef CONFIG_FUNCTION_TRACER 821KBUILD_CFLAGS += -fomit-frame-pointer 822endif 823endif 824 825# Initialize all stack variables with a 0xAA pattern. 826ifdef CONFIG_INIT_STACK_ALL_PATTERN 827KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 828endif 829 830# Initialize all stack variables with a zero value. 831ifdef CONFIG_INIT_STACK_ALL_ZERO 832# Future support for zero initialization is still being debated, see 833# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 834# renamed or dropped. 835KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 836KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 837endif 838 839# While VLAs have been removed, GCC produces unreachable stack probes 840# for the randomize_kstack_offset feature. Disable it for all compilers. 841KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 842 843DEBUG_CFLAGS := 844 845# Workaround for GCC versions < 5.0 846# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 847ifdef CONFIG_CC_IS_GCC 848DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 849endif 850 851ifdef CONFIG_DEBUG_INFO 852 853ifdef CONFIG_DEBUG_INFO_SPLIT 854DEBUG_CFLAGS += -gsplit-dwarf 855else 856DEBUG_CFLAGS += -g 857endif 858 859ifneq ($(LLVM_IAS),1) 860KBUILD_AFLAGS += -Wa,-gdwarf-2 861endif 862 863ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 864dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 865dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 866DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 867endif 868 869ifdef CONFIG_DEBUG_INFO_REDUCED 870DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 871 $(call cc-option,-fno-var-tracking) 872endif 873 874ifdef CONFIG_DEBUG_INFO_COMPRESSED 875DEBUG_CFLAGS += -gz=zlib 876KBUILD_AFLAGS += -gz=zlib 877KBUILD_LDFLAGS += --compress-debug-sections=zlib 878endif 879 880endif # CONFIG_DEBUG_INFO 881 882KBUILD_CFLAGS += $(DEBUG_CFLAGS) 883export DEBUG_CFLAGS 884 885ifdef CONFIG_FUNCTION_TRACER 886ifdef CONFIG_FTRACE_MCOUNT_USE_CC 887 CC_FLAGS_FTRACE += -mrecord-mcount 888 ifdef CONFIG_HAVE_NOP_MCOUNT 889 ifeq ($(call cc-option-yn, -mnop-mcount),y) 890 CC_FLAGS_FTRACE += -mnop-mcount 891 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 892 endif 893 endif 894endif 895ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 896 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 897endif 898ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 899 ifdef CONFIG_HAVE_C_RECORDMCOUNT 900 BUILD_C_RECORDMCOUNT := y 901 export BUILD_C_RECORDMCOUNT 902 endif 903endif 904ifdef CONFIG_HAVE_FENTRY 905 ifeq ($(call cc-option-yn, -mfentry),y) 906 CC_FLAGS_FTRACE += -mfentry 907 CC_FLAGS_USING += -DCC_USING_FENTRY 908 endif 909endif 910export CC_FLAGS_FTRACE 911KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 912KBUILD_AFLAGS += $(CC_FLAGS_USING) 913endif 914 915# We trigger additional mismatches with less inlining 916ifdef CONFIG_DEBUG_SECTION_MISMATCH 917KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 918endif 919 920ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 921KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 922LDFLAGS_vmlinux += --gc-sections 923endif 924 925ifdef CONFIG_SHADOW_CALL_STACK 926CC_FLAGS_SCS := -fsanitize=shadow-call-stack 927KBUILD_CFLAGS += $(CC_FLAGS_SCS) 928export CC_FLAGS_SCS 929endif 930 931ifdef CONFIG_LTO_CLANG 932ifdef CONFIG_LTO_CLANG_THIN 933CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 934KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 935else 936CC_FLAGS_LTO := -flto 937endif 938CC_FLAGS_LTO += -fvisibility=hidden 939 940# Limit inlining across translation units to reduce binary size 941KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 942 943# Check for frame size exceeding threshold during prolog/epilog insertion 944# when using lld < 13.0.0. 945ifneq ($(CONFIG_FRAME_WARN),0) 946ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 947KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 948endif 949endif 950endif 951 952ifdef CONFIG_LTO 953KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 954KBUILD_AFLAGS += -fno-lto 955export CC_FLAGS_LTO 956endif 957 958ifdef CONFIG_CFI_CLANG 959CC_FLAGS_CFI := -fsanitize=cfi \ 960 -fsanitize-cfi-cross-dso \ 961 -fno-sanitize-cfi-canonical-jump-tables \ 962 -fno-sanitize-trap=cfi \ 963 -fno-sanitize-blacklist 964 965ifdef CONFIG_CFI_PERMISSIVE 966CC_FLAGS_CFI += -fsanitize-recover=cfi 967endif 968 969# If LTO flags are filtered out, we must also filter out CFI. 970CC_FLAGS_LTO += $(CC_FLAGS_CFI) 971KBUILD_CFLAGS += $(CC_FLAGS_CFI) 972export CC_FLAGS_CFI 973endif 974 975ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 976KBUILD_CFLAGS += -falign-functions=32 977endif 978 979# arch Makefile may override CC so keep this after arch Makefile is included 980NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 981 982# warn about C99 declaration after statement 983KBUILD_CFLAGS += -Wdeclaration-after-statement 984 985# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 986KBUILD_CFLAGS += -Wvla 987 988# disable pointer signed / unsigned warnings in gcc 4.0 989KBUILD_CFLAGS += -Wno-pointer-sign 990 991# disable stringop warnings in gcc 8+ 992KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 993 994# We'll want to enable this eventually, but it's not going away for 5.7 at least 995KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 996KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 997KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 998 999# Another good warning that we'll want to enable eventually 1000KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1001 1002# Enabled with W=2, disabled by default as noisy 1003KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 1004 1005# disable invalid "can't wrap" optimizations for signed / pointers 1006KBUILD_CFLAGS += -fno-strict-overflow 1007 1008# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1009KBUILD_CFLAGS += -fno-stack-check 1010 1011# conserve stack if available 1012KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 1013 1014# Prohibit date/time macros, which would make the build non-deterministic 1015KBUILD_CFLAGS += -Werror=date-time 1016 1017# enforce correct pointer usage 1018KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1019 1020# Require designated initializers for all marked structures 1021KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1022 1023# change __FILE__ to the relative path from the srctree 1024KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1025 1026# include additional Makefiles when needed 1027include-y := scripts/Makefile.extrawarn 1028include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1029include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1030include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1031include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1032include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1033 1034include $(addprefix $(srctree)/, $(include-y)) 1035 1036# scripts/Makefile.gcc-plugins is intentionally included last. 1037# Do not add $(call cc-option,...) below this line. When you build the kernel 1038# from the clean source tree, the GCC plugins do not exist at this point. 1039 1040# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1041KBUILD_CPPFLAGS += $(KCPPFLAGS) 1042KBUILD_AFLAGS += $(KAFLAGS) 1043KBUILD_CFLAGS += $(KCFLAGS) 1044 1045KBUILD_LDFLAGS_MODULE += --build-id=sha1 1046LDFLAGS_vmlinux += --build-id=sha1 1047 1048ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1049LDFLAGS_vmlinux += $(call ld-option, -X,) 1050endif 1051 1052ifeq ($(CONFIG_RELR),y) 1053LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1054endif 1055 1056# We never want expected sections to be placed heuristically by the 1057# linker. All sections should be explicitly named in the linker script. 1058ifdef CONFIG_LD_ORPHAN_WARN 1059LDFLAGS_vmlinux += --orphan-handling=warn 1060endif 1061 1062# Align the bit size of userspace programs with the kernel 1063KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1064KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1065 1066# make the checker run with the right architecture 1067CHECKFLAGS += --arch=$(ARCH) 1068 1069# insure the checker run with the right endianness 1070CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1071 1072# the checker needs the correct machine size 1073CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1074 1075# Default kernel image to build when no specific target is given. 1076# KBUILD_IMAGE may be overruled on the command line or 1077# set in the environment 1078# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1079# this default value 1080export KBUILD_IMAGE ?= vmlinux 1081 1082# 1083# INSTALL_PATH specifies where to place the updated kernel and system map 1084# images. Default is /boot, but you can set it to other values 1085export INSTALL_PATH ?= /boot 1086 1087# 1088# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1089# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1090# an argument if needed. Otherwise it defaults to the kernel install path 1091# 1092export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1093 1094# 1095# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1096# relocations required by build roots. This is not defined in the 1097# makefile but the argument can be passed to make if needed. 1098# 1099 1100MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1101export MODLIB 1102 1103HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1104 1105has_libelf = $(call try-run,\ 1106 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1107 1108ifdef CONFIG_STACK_VALIDATION 1109 ifeq ($(has_libelf),1) 1110 objtool_target := tools/objtool FORCE 1111 else 1112 SKIP_STACK_VALIDATION := 1 1113 export SKIP_STACK_VALIDATION 1114 endif 1115endif 1116 1117PHONY += resolve_btfids_clean 1118 1119resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1120 1121# tools/bpf/resolve_btfids directory might not exist 1122# in output directory, skip its clean in that case 1123resolve_btfids_clean: 1124ifneq ($(wildcard $(resolve_btfids_O)),) 1125 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1126endif 1127 1128ifdef CONFIG_BPF 1129ifdef CONFIG_DEBUG_INFO_BTF 1130 ifeq ($(has_libelf),1) 1131 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1132 else 1133 ERROR_RESOLVE_BTFIDS := 1 1134 endif 1135endif # CONFIG_DEBUG_INFO_BTF 1136endif # CONFIG_BPF 1137 1138PHONY += prepare0 1139 1140export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1141export MODORDER := $(extmod_prefix)modules.order 1142export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1143 1144ifeq ($(KBUILD_EXTMOD),) 1145core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1146 1147vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1148 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1149 $(libs-y) $(libs-m))) 1150 1151vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1152 $(patsubst %/,%,$(filter %/, $(core-) \ 1153 $(drivers-) $(libs-)))) 1154 1155subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1156 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1157 $(drivers-y) $(drivers-m))) 1158 1159build-dirs := $(vmlinux-dirs) 1160clean-dirs := $(vmlinux-alldirs) 1161 1162# Externally visible symbols (used by link-vmlinux.sh) 1163KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1164KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1165ifdef CONFIG_MODULES 1166KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1167KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1168else 1169KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1170endif 1171KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1172 1173export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1174export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1175# used by scripts/Makefile.package 1176export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1177 1178vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1179 1180# Recurse until adjust_autoksyms.sh is satisfied 1181PHONY += autoksyms_recursive 1182ifdef CONFIG_TRIM_UNUSED_KSYMS 1183# For the kernel to actually contain only the needed exported symbols, 1184# we have to build modules as well to determine what those symbols are. 1185# (this can be evaluated only once include/config/auto.conf has been included) 1186KBUILD_MODULES := 1 1187 1188autoksyms_recursive: descend modules.order 1189 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1190 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1191endif 1192 1193autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1194 1195quiet_cmd_autoksyms_h = GEN $@ 1196 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1197 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1198 1199$(autoksyms_h): 1200 $(call cmd,autoksyms_h) 1201 1202ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1203 1204# Final link of vmlinux with optional arch pass after final link 1205cmd_link-vmlinux = \ 1206 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1207 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1208 1209vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1210 +$(call if_changed_dep,link-vmlinux) 1211 1212targets := vmlinux 1213 1214# The actual objects are generated when descending, 1215# make sure no implicit rule kicks in 1216$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1217 1218filechk_kernel.release = \ 1219 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1220 1221# Store (new) KERNELRELEASE string in include/config/kernel.release 1222include/config/kernel.release: FORCE 1223 $(call filechk,kernel.release) 1224 1225# Additional helpers built in scripts/ 1226# Carefully list dependencies so we do not try to build scripts twice 1227# in parallel 1228PHONY += scripts 1229scripts: scripts_basic scripts_dtc 1230 $(Q)$(MAKE) $(build)=$(@) 1231 1232# Things we need to do before we recursively start building the kernel 1233# or the modules are listed in "prepare". 1234# A multi level approach is used. prepareN is processed before prepareN-1. 1235# archprepare is used in arch Makefiles and when processed asm symlink, 1236# version.h and scripts_basic is processed / created. 1237 1238PHONY += prepare archprepare 1239 1240archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1241 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1242 include/generated/autoconf.h remove-stale-files 1243 1244prepare0: archprepare 1245 $(Q)$(MAKE) $(build)=scripts/mod 1246 $(Q)$(MAKE) $(build)=. 1247 1248# All the preparing.. 1249prepare: prepare0 prepare-objtool prepare-resolve_btfids 1250 1251PHONY += remove-stale-files 1252remove-stale-files: 1253 $(Q)$(srctree)/scripts/remove-stale-files 1254 1255# Support for using generic headers in asm-generic 1256asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1257 1258PHONY += asm-generic uapi-asm-generic 1259asm-generic: uapi-asm-generic 1260 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1261 generic=include/asm-generic 1262uapi-asm-generic: 1263 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1264 generic=include/uapi/asm-generic 1265 1266PHONY += prepare-objtool prepare-resolve_btfids 1267prepare-objtool: $(objtool_target) 1268ifeq ($(SKIP_STACK_VALIDATION),1) 1269ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1270 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1271 @false 1272endif 1273ifdef CONFIG_UNWINDER_ORC 1274 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1275 @false 1276else 1277 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1278endif 1279endif 1280 1281prepare-resolve_btfids: $(resolve_btfids_target) 1282ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1283 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1284 @false 1285endif 1286# Generate some files 1287# --------------------------------------------------------------------------- 1288 1289# KERNELRELEASE can change from a few different places, meaning version.h 1290# needs to be updated, so this check is forced on all builds 1291 1292uts_len := 64 1293define filechk_utsrelease.h 1294 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1295 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1296 exit 1; \ 1297 fi; \ 1298 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1299endef 1300 1301define filechk_version.h 1302 if [ $(SUBLEVEL) -gt 255 ]; then \ 1303 echo \#define LINUX_VERSION_CODE $(shell \ 1304 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1305 else \ 1306 echo \#define LINUX_VERSION_CODE $(shell \ 1307 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1308 fi; \ 1309 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1310 ((c) > 255 ? 255 : (c)))'; \ 1311 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1312 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1313 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1314endef 1315 1316$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1317$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1318$(version_h): FORCE 1319 $(call filechk,version.h) 1320 1321include/generated/utsrelease.h: include/config/kernel.release FORCE 1322 $(call filechk,utsrelease.h) 1323 1324PHONY += headerdep 1325headerdep: 1326 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1327 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1328 1329# --------------------------------------------------------------------------- 1330# Kernel headers 1331 1332#Default location for installed headers 1333export INSTALL_HDR_PATH = $(objtree)/usr 1334 1335quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1336 cmd_headers_install = \ 1337 mkdir -p $(INSTALL_HDR_PATH); \ 1338 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1339 usr/include $(INSTALL_HDR_PATH) 1340 1341PHONY += headers_install 1342headers_install: headers 1343 $(call cmd,headers_install) 1344 1345PHONY += archheaders archscripts 1346 1347hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1348 1349PHONY += headers 1350headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1351 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1352 $(error Headers not exportable for the $(SRCARCH) architecture)) 1353 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1354 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1355 1356# Deprecated. It is no-op now. 1357PHONY += headers_check 1358headers_check: 1359 @echo >&2 "=================== WARNING ===================" 1360 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1361 @echo >&2 "and will be removed after Linux 5.15 release." 1362 @echo >&2 "Please remove headers_check from your scripts." 1363 @echo >&2 "===============================================" 1364 1365ifdef CONFIG_HEADERS_INSTALL 1366prepare: headers 1367endif 1368 1369PHONY += scripts_unifdef 1370scripts_unifdef: scripts_basic 1371 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1372 1373# --------------------------------------------------------------------------- 1374# Install 1375 1376# Many distributions have the custom install script, /sbin/installkernel. 1377# If DKMS is installed, 'make install' will eventually recuses back 1378# to the this Makefile to build and install external modules. 1379# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1380 1381install: sub_make_done := 1382 1383# Kernel selftest 1384 1385PHONY += kselftest 1386kselftest: 1387 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1388 1389kselftest-%: FORCE 1390 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1391 1392PHONY += kselftest-merge 1393kselftest-merge: 1394 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1395 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1396 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1397 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1398 1399# --------------------------------------------------------------------------- 1400# Devicetree files 1401 1402ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1403dtstree := arch/$(SRCARCH)/boot/dts 1404endif 1405 1406ifneq ($(dtstree),) 1407 1408%.dtb: include/config/kernel.release scripts_dtc 1409 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1410 1411%.dtbo: include/config/kernel.release scripts_dtc 1412 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1413 1414PHONY += dtbs dtbs_install dtbs_check 1415dtbs: include/config/kernel.release scripts_dtc 1416 $(Q)$(MAKE) $(build)=$(dtstree) 1417 1418ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1419export CHECK_DTBS=y 1420dtbs: dt_binding_check 1421endif 1422 1423dtbs_check: dtbs 1424 1425dtbs_install: 1426 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1427 1428ifdef CONFIG_OF_EARLY_FLATTREE 1429all: dtbs 1430endif 1431 1432endif 1433 1434PHONY += scripts_dtc 1435scripts_dtc: scripts_basic 1436 $(Q)$(MAKE) $(build)=scripts/dtc 1437 1438ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1439export CHECK_DT_BINDING=y 1440endif 1441 1442PHONY += dt_binding_check 1443dt_binding_check: scripts_dtc 1444 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1445 1446# --------------------------------------------------------------------------- 1447# Modules 1448 1449ifdef CONFIG_MODULES 1450 1451# By default, build modules as well 1452 1453all: modules 1454 1455# When we're building modules with modversions, we need to consider 1456# the built-in objects during the descend as well, in order to 1457# make sure the checksums are up to date before we record them. 1458ifdef CONFIG_MODVERSIONS 1459 KBUILD_BUILTIN := 1 1460endif 1461 1462# Build modules 1463# 1464# A module can be listed more than once in obj-m resulting in 1465# duplicate lines in modules.order files. Those are removed 1466# using awk while concatenating to the final file. 1467 1468PHONY += modules 1469modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1470 1471cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1472 1473modules.order: $(subdir-modorder) FORCE 1474 $(call if_changed,modules_order) 1475 1476targets += modules.order 1477 1478# Target to prepare building external modules 1479PHONY += modules_prepare 1480modules_prepare: prepare 1481 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1482 1483export modules_sign_only := 1484 1485ifeq ($(CONFIG_MODULE_SIG),y) 1486PHONY += modules_sign 1487modules_sign: modules_install 1488 @: 1489 1490# modules_sign is a subset of modules_install. 1491# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1492ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1493modules_sign_only := y 1494endif 1495endif 1496 1497modinst_pre := 1498ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1499modinst_pre := __modinst_pre 1500endif 1501 1502modules_install: $(modinst_pre) 1503PHONY += __modinst_pre 1504__modinst_pre: 1505 @rm -rf $(MODLIB)/kernel 1506 @rm -f $(MODLIB)/source 1507 @mkdir -p $(MODLIB)/kernel 1508 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1509 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1510 rm -f $(MODLIB)/build ; \ 1511 ln -s $(CURDIR) $(MODLIB)/build ; \ 1512 fi 1513 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1514 @cp -f modules.builtin $(MODLIB)/ 1515 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1516 1517endif # CONFIG_MODULES 1518 1519### 1520# Cleaning is done on three levels. 1521# make clean Delete most generated files 1522# Leave enough to build external modules 1523# make mrproper Delete the current configuration, and all generated files 1524# make distclean Remove editor backup files, patch leftover files and the like 1525 1526# Directories & files removed with 'make clean' 1527CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1528 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1529 compile_commands.json .thinlto-cache 1530 1531# Directories & files removed with 'make mrproper' 1532MRPROPER_FILES += include/config include/generated \ 1533 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1534 debian snap tar-install \ 1535 .config .config.old .version \ 1536 Module.symvers \ 1537 certs/signing_key.pem certs/signing_key.x509 \ 1538 certs/x509.genkey \ 1539 vmlinux-gdb.py \ 1540 *.spec 1541 1542# clean - Delete most, but leave enough to build external modules 1543# 1544clean: rm-files := $(CLEAN_FILES) 1545 1546PHONY += archclean vmlinuxclean 1547 1548vmlinuxclean: 1549 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1550 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1551 1552clean: archclean vmlinuxclean resolve_btfids_clean 1553 1554# mrproper - Delete all generated files, including .config 1555# 1556mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1557mrproper-dirs := $(addprefix _mrproper_,scripts) 1558 1559PHONY += $(mrproper-dirs) mrproper 1560$(mrproper-dirs): 1561 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1562 1563mrproper: clean $(mrproper-dirs) 1564 $(call cmd,rmfiles) 1565 1566# distclean 1567# 1568PHONY += distclean 1569 1570distclean: mrproper 1571 @find . $(RCS_FIND_IGNORE) \ 1572 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1573 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1574 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1575 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1576 -type f -print | xargs rm -f 1577 1578 1579# Packaging of the kernel to various formats 1580# --------------------------------------------------------------------------- 1581 1582%src-pkg: FORCE 1583 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1584%pkg: include/config/kernel.release FORCE 1585 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1586 1587# Brief documentation of the typical targets used 1588# --------------------------------------------------------------------------- 1589 1590boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1591boards := $(sort $(notdir $(boards))) 1592board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1593board-dirs := $(sort $(notdir $(board-dirs:/=))) 1594 1595PHONY += help 1596help: 1597 @echo 'Cleaning targets:' 1598 @echo ' clean - Remove most generated files but keep the config and' 1599 @echo ' enough build support to build external modules' 1600 @echo ' mrproper - Remove all generated files + config + various backup files' 1601 @echo ' distclean - mrproper + remove editor backup and patch files' 1602 @echo '' 1603 @echo 'Configuration targets:' 1604 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1605 @echo '' 1606 @echo 'Other generic targets:' 1607 @echo ' all - Build all targets marked with [*]' 1608 @echo '* vmlinux - Build the bare kernel' 1609 @echo '* modules - Build all modules' 1610 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1611 @echo ' dir/ - Build all files in dir and below' 1612 @echo ' dir/file.[ois] - Build specified target only' 1613 @echo ' dir/file.ll - Build the LLVM assembly file' 1614 @echo ' (requires compiler support for LLVM assembly generation)' 1615 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1616 @echo ' (requires a recent binutils and recent build (System.map))' 1617 @echo ' dir/file.ko - Build module including final link' 1618 @echo ' modules_prepare - Set up for building external modules' 1619 @echo ' tags/TAGS - Generate tags file for editors' 1620 @echo ' cscope - Generate cscope index' 1621 @echo ' gtags - Generate GNU GLOBAL index' 1622 @echo ' kernelrelease - Output the release version string (use with make -s)' 1623 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1624 @echo ' image_name - Output the image name (use with make -s)' 1625 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1626 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1627 echo '' 1628 @echo 'Static analysers:' 1629 @echo ' checkstack - Generate a list of stack hogs' 1630 @echo ' versioncheck - Sanity check on version.h usage' 1631 @echo ' includecheck - Check for duplicate included header files' 1632 @echo ' export_report - List the usages of all exported symbols' 1633 @echo ' headerdep - Detect inclusion cycles in headers' 1634 @echo ' coccicheck - Check with Coccinelle' 1635 @echo ' clang-analyzer - Check with clang static analyzer' 1636 @echo ' clang-tidy - Check with clang-tidy' 1637 @echo '' 1638 @echo 'Tools:' 1639 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1640 @echo '' 1641 @echo 'Kernel selftest:' 1642 @echo ' kselftest - Build and run kernel selftest' 1643 @echo ' Build, install, and boot kernel before' 1644 @echo ' running kselftest on it' 1645 @echo ' Run as root for full coverage' 1646 @echo ' kselftest-all - Build kernel selftest' 1647 @echo ' kselftest-install - Build and install kernel selftest' 1648 @echo ' kselftest-clean - Remove all generated kselftest files' 1649 @echo ' kselftest-merge - Merge all the config dependencies of' 1650 @echo ' kselftest to existing .config.' 1651 @echo '' 1652 @$(if $(dtstree), \ 1653 echo 'Devicetree:'; \ 1654 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1655 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1656 echo ' dt_binding_check - Validate device tree binding documents'; \ 1657 echo ' dtbs_check - Validate device tree source files';\ 1658 echo '') 1659 1660 @echo 'Userspace tools targets:' 1661 @echo ' use "make tools/help"' 1662 @echo ' or "cd tools; make help"' 1663 @echo '' 1664 @echo 'Kernel packaging:' 1665 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1666 @echo '' 1667 @echo 'Documentation targets:' 1668 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1669 @echo '' 1670 @echo 'Architecture specific targets ($(SRCARCH)):' 1671 @$(if $(archhelp),$(archhelp),\ 1672 echo ' No architecture specific help defined for $(SRCARCH)') 1673 @echo '' 1674 @$(if $(boards), \ 1675 $(foreach b, $(boards), \ 1676 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1677 echo '') 1678 @$(if $(board-dirs), \ 1679 $(foreach b, $(board-dirs), \ 1680 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1681 printf " %-16s - Show all of the above\\n" help-boards; \ 1682 echo '') 1683 1684 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1685 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1686 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1687 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1688 @echo ' (sparse by default)' 1689 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1690 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1691 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1692 @echo ' 1: warnings which may be relevant and do not occur too often' 1693 @echo ' 2: warnings which occur quite often but may still be relevant' 1694 @echo ' 3: more obscure warnings, can most likely be ignored' 1695 @echo ' Multiple levels can be combined with W=12 or W=123' 1696 @echo '' 1697 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1698 @echo 'For further info see the ./README file' 1699 1700 1701help-board-dirs := $(addprefix help-,$(board-dirs)) 1702 1703help-boards: $(help-board-dirs) 1704 1705boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1706 1707$(help-board-dirs): help-%: 1708 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1709 @$(if $(boards-per-dir), \ 1710 $(foreach b, $(boards-per-dir), \ 1711 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1712 echo '') 1713 1714 1715# Documentation targets 1716# --------------------------------------------------------------------------- 1717DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1718 linkcheckdocs dochelp refcheckdocs 1719PHONY += $(DOC_TARGETS) 1720$(DOC_TARGETS): 1721 $(Q)$(MAKE) $(build)=Documentation $@ 1722 1723# Misc 1724# --------------------------------------------------------------------------- 1725 1726PHONY += scripts_gdb 1727scripts_gdb: prepare0 1728 $(Q)$(MAKE) $(build)=scripts/gdb 1729 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1730 1731ifdef CONFIG_GDB_SCRIPTS 1732all: scripts_gdb 1733endif 1734 1735else # KBUILD_EXTMOD 1736 1737### 1738# External module support. 1739# When building external modules the kernel used as basis is considered 1740# read-only, and no consistency checks are made and the make 1741# system is not used on the basis kernel. If updates are required 1742# in the basis kernel ordinary make commands (without M=...) must be used. 1743 1744# We are always building only modules. 1745KBUILD_BUILTIN := 1746KBUILD_MODULES := 1 1747 1748build-dirs := $(KBUILD_EXTMOD) 1749$(MODORDER): descend 1750 @: 1751 1752compile_commands.json: $(extmod_prefix)compile_commands.json 1753PHONY += compile_commands.json 1754 1755clean-dirs := $(KBUILD_EXTMOD) 1756clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1757 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1758 1759PHONY += help 1760help: 1761 @echo ' Building external modules.' 1762 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1763 @echo '' 1764 @echo ' modules - default target, build the module(s)' 1765 @echo ' modules_install - install the module' 1766 @echo ' clean - remove generated files in module directory only' 1767 @echo '' 1768 1769# no-op for external module builds 1770PHONY += prepare modules_prepare 1771 1772endif # KBUILD_EXTMOD 1773 1774# --------------------------------------------------------------------------- 1775# Modules 1776 1777PHONY += modules modules_install 1778 1779ifdef CONFIG_MODULES 1780 1781modules: modules_check 1782 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1783 1784PHONY += modules_check 1785modules_check: $(MODORDER) 1786 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1787 1788quiet_cmd_depmod = DEPMOD $(MODLIB) 1789 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1790 $(KERNELRELEASE) 1791 1792modules_install: 1793 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1794 $(call cmd,depmod) 1795 1796else # CONFIG_MODULES 1797 1798# Modules not configured 1799# --------------------------------------------------------------------------- 1800 1801modules modules_install: 1802 @echo >&2 '***' 1803 @echo >&2 '*** The present kernel configuration has modules disabled.' 1804 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1805 @echo >&2 '*** to enable CONFIG_MODULES.' 1806 @echo >&2 '***' 1807 @exit 1 1808 1809endif # CONFIG_MODULES 1810 1811# Single targets 1812# --------------------------------------------------------------------------- 1813# To build individual files in subdirectories, you can do like this: 1814# 1815# make foo/bar/baz.s 1816# 1817# The supported suffixes for single-target are listed in 'single-targets' 1818# 1819# To build only under specific subdirectories, you can do like this: 1820# 1821# make foo/bar/baz/ 1822 1823ifdef single-build 1824 1825# .ko is special because modpost is needed 1826single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1827single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1828 1829$(single-ko): single_modpost 1830 @: 1831$(single-no-ko): descend 1832 @: 1833 1834ifeq ($(KBUILD_EXTMOD),) 1835# For the single build of in-tree modules, use a temporary file to avoid 1836# the situation of modules_install installing an invalid modules.order. 1837MODORDER := .modules.tmp 1838endif 1839 1840PHONY += single_modpost 1841single_modpost: $(single-no-ko) modules_prepare 1842 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1843 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1844 1845KBUILD_MODULES := 1 1846 1847export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1848 1849# trim unrelated directories 1850build-dirs := $(foreach d, $(build-dirs), \ 1851 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1852 1853endif 1854 1855ifndef CONFIG_MODULES 1856KBUILD_MODULES := 1857endif 1858 1859# Handle descending into subdirectories listed in $(build-dirs) 1860# Preset locale variables to speed up the build process. Limit locale 1861# tweaks to this spot to avoid wrong language settings when running 1862# make menuconfig etc. 1863# Error messages still appears in the original language 1864PHONY += descend $(build-dirs) 1865descend: $(build-dirs) 1866$(build-dirs): prepare 1867 $(Q)$(MAKE) $(build)=$@ \ 1868 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1869 need-builtin=1 need-modorder=1 1870 1871clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1872PHONY += $(clean-dirs) clean 1873$(clean-dirs): 1874 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1875 1876clean: $(clean-dirs) 1877 $(call cmd,rmfiles) 1878 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1879 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1880 -o -name '*.ko.*' \ 1881 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1882 -o -name '*.dwo' -o -name '*.lst' \ 1883 -o -name '*.su' -o -name '*.mod' \ 1884 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1885 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1886 -o -name '*.asn1.[ch]' \ 1887 -o -name '*.symtypes' -o -name 'modules.order' \ 1888 -o -name '.tmp_*.o.*' \ 1889 -o -name '*.c.[012]*.*' \ 1890 -o -name '*.ll' \ 1891 -o -name '*.gcno' \ 1892 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1893 1894# Generate tags for editors 1895# --------------------------------------------------------------------------- 1896quiet_cmd_tags = GEN $@ 1897 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1898 1899tags TAGS cscope gtags: FORCE 1900 $(call cmd,tags) 1901 1902# Script to generate missing namespace dependencies 1903# --------------------------------------------------------------------------- 1904 1905PHONY += nsdeps 1906nsdeps: export KBUILD_NSDEPS=1 1907nsdeps: modules 1908 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1909 1910# Clang Tooling 1911# --------------------------------------------------------------------------- 1912 1913quiet_cmd_gen_compile_commands = GEN $@ 1914 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1915 1916$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1917 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1918 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1919 $(call if_changed,gen_compile_commands) 1920 1921targets += $(extmod_prefix)compile_commands.json 1922 1923PHONY += clang-tidy clang-analyzer 1924 1925ifdef CONFIG_CC_IS_CLANG 1926quiet_cmd_clang_tools = CHECK $< 1927 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1928 1929clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1930 $(call cmd,clang_tools) 1931else 1932clang-tidy clang-analyzer: 1933 @echo "$@ requires CC=clang" >&2 1934 @false 1935endif 1936 1937# Scripts to check various things for consistency 1938# --------------------------------------------------------------------------- 1939 1940PHONY += includecheck versioncheck coccicheck export_report 1941 1942includecheck: 1943 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1944 -name '*.[hcS]' -type f -print | sort \ 1945 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1946 1947versioncheck: 1948 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1949 -name '*.[hcS]' -type f -print | sort \ 1950 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1951 1952coccicheck: 1953 $(Q)$(BASH) $(srctree)/scripts/$@ 1954 1955export_report: 1956 $(PERL) $(srctree)/scripts/export_report.pl 1957 1958PHONY += checkstack kernelrelease kernelversion image_name 1959 1960# UML needs a little special treatment here. It wants to use the host 1961# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1962# else wants $(ARCH), including people doing cross-builds, which means 1963# that $(SUBARCH) doesn't work here. 1964ifeq ($(ARCH), um) 1965CHECKSTACK_ARCH := $(SUBARCH) 1966else 1967CHECKSTACK_ARCH := $(ARCH) 1968endif 1969checkstack: 1970 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1971 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1972 1973kernelrelease: 1974 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1975 1976kernelversion: 1977 @echo $(KERNELVERSION) 1978 1979image_name: 1980 @echo $(KBUILD_IMAGE) 1981 1982# Clear a bunch of variables before executing the submake 1983 1984ifeq ($(quiet),silent_) 1985tools_silent=s 1986endif 1987 1988tools/: FORCE 1989 $(Q)mkdir -p $(objtree)/tools 1990 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1991 1992tools/%: FORCE 1993 $(Q)mkdir -p $(objtree)/tools 1994 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1995 1996quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1997 cmd_rmfiles = rm -rf $(rm-files) 1998 1999# read saved command lines for existing targets 2000existing-targets := $(wildcard $(sort $(targets)))
2001 2002-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2003 2004endif # config-build 2005endif # mixed-build 2006endif # need-sub-make 2007 2008PHONY += FORCE 2009FORCE: 2010 2011# Declare the contents of the PHONY variable as phony. We keep that 2012# information in a variable so we can use it in if_changed and friends. 2013.PHONY: $(PHONY) 2014