1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 6NAME = Hurr durr I'ma ninja sloth 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 14ifeq ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41ifneq ($(sub_make_done),1) 42 43# Do not use make's built-in rules and variables 44# (this increases performance and avoids hard-to-debug behaviour) 45MAKEFLAGS += -rR 46 47# Avoid funny character set dependencies 48unexport LC_ALL 49LC_COLLATE=C 50LC_NUMERIC=C 51export LC_COLLATE LC_NUMERIC 52 53# Avoid interference with shell env settings 54unexport GREP_OPTIONS 55 56# Beautify output 57# --------------------------------------------------------------------------- 58# 59# Most of build commands in Kbuild start with "cmd_". You can optionally define 60# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 61# that command is printed by default. 62# 63# e.g.) 64# quiet_cmd_depmod = DEPMOD $(MODLIB) 65# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 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# $(Q)$(MAKE) $(build)=scripts/basic 71# 72# If KBUILD_VERBOSE contains 1, the whole command is echoed. 73# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 74# 75# To put more focus on warnings, be less verbose as default 76# Use 'make V=1' to see the full commands 77 78ifeq ("$(origin V)", "command line") 79 KBUILD_VERBOSE = $(V) 80endif 81 82quiet = quiet_ 83Q = @ 84 85ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 86 quiet = 87 Q = 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 93 94ifeq ($(filter 3.%,$(MAKE_VERSION)),) 95short-opts := $(firstword -$(MAKEFLAGS)) 96else 97short-opts := $(filter-out --%,$(MAKEFLAGS)) 98endif 99 100ifneq ($(findstring s,$(short-opts)),) 101quiet=silent_ 102override KBUILD_VERBOSE := 103endif 104 105export quiet Q KBUILD_VERBOSE 106 107# Call a source code checker (by default, "sparse") as part of the 108# C compilation. 109# 110# Use 'make C=1' to enable checking of only re-compiled files. 111# Use 'make C=2' to enable checking of *all* source files, regardless 112# of whether they are re-compiled or not. 113# 114# See the file "Documentation/dev-tools/sparse.rst" for more details, 115# including where to get the "sparse" utility. 116 117ifeq ("$(origin C)", "command line") 118 KBUILD_CHECKSRC = $(C) 119endif 120ifndef KBUILD_CHECKSRC 121 KBUILD_CHECKSRC = 0 122endif 123 124export KBUILD_CHECKSRC 125 126# Enable "clippy" (a linter) as part of the Rust compilation. 127# 128# Use 'make CLIPPY=1' to enable it. 129ifeq ("$(origin CLIPPY)", "command line") 130 KBUILD_CLIPPY := $(CLIPPY) 131endif 132 133export KBUILD_CLIPPY 134 135# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 136# directory of external module to build. Setting M= takes precedence. 137ifeq ("$(origin M)", "command line") 138 KBUILD_EXTMOD := $(M) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154# Kbuild will save output files in the current working directory. 155# This does not need to match to the root of the kernel source tree. 156# 157# For example, you can do this: 158# 159# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 160# 161# If you want to save output files in a different location, there are 162# two syntaxes to specify it. 163# 164# 1) O= 165# Use "make O=dir/to/store/output/files/" 166# 167# 2) Set KBUILD_OUTPUT 168# Set the environment variable KBUILD_OUTPUT to point to the output directory. 169# export KBUILD_OUTPUT=dir/to/store/output/files/; make 170# 171# The O= assignment takes precedence over the KBUILD_OUTPUT environment 172# variable. 173 174# Do we want to change the working directory? 175ifeq ("$(origin O)", "command line") 176 KBUILD_OUTPUT := $(O) 177endif 178 179ifneq ($(KBUILD_OUTPUT),) 180# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 181# expand a shell special character '~'. We use a somewhat tedious way here. 182abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 183$(if $(abs_objtree),, \ 184 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 185 186# $(realpath ...) resolves symlinks 187abs_objtree := $(realpath $(abs_objtree)) 188else 189abs_objtree := $(CURDIR) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifeq ($(abs_objtree),$(CURDIR)) 193# Suppress "Entering directory ..." unless we are changing the work directory. 194MAKEFLAGS += --no-print-directory 195else 196need-sub-make := 1 197endif 198 199this-makefile := $(lastword $(MAKEFILE_LIST)) 200abs_srctree := $(realpath $(dir $(this-makefile))) 201 202ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 203$(error source directory cannot contain spaces or colons) 204endif 205 206ifneq ($(abs_srctree),$(abs_objtree)) 207# Look for make include files relative to root of kernel src 208# 209# --included-dir is added for backward compatibility, but you should not rely on 210# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 211MAKEFLAGS += --include-dir=$(abs_srctree) 212endif 213 214ifneq ($(filter 3.%,$(MAKE_VERSION)),) 215# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 216# We need to invoke sub-make to avoid implicit rules in the top Makefile. 217need-sub-make := 1 218# Cancel implicit rules for this Makefile. 219$(this-makefile): ; 220endif 221 222export abs_srctree abs_objtree 223export sub_make_done := 1 224 225ifeq ($(need-sub-make),1) 226 227PHONY += $(MAKECMDGOALS) __sub-make 228 229$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 230 @: 231 232# Invoke a second make in the output directory, passing relevant variables 233__sub-make: 234 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 235 236endif # need-sub-make 237endif # sub_make_done 238 239# We process the rest of the Makefile if this is the final invocation of make 240ifeq ($(need-sub-make),) 241 242# Do not print "Entering directory ...", 243# but we want to display it when entering to the output directory 244# so that IDEs/editors are able to understand relative filenames. 245MAKEFLAGS += --no-print-directory 246 247ifeq ($(abs_srctree),$(abs_objtree)) 248 # building in the source tree 249 srctree := . 250 building_out_of_srctree := 251else 252 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 253 # building in a subdirectory of the source tree 254 srctree := .. 255 else 256 srctree := $(abs_srctree) 257 endif 258 building_out_of_srctree := 1 259endif 260 261ifneq ($(KBUILD_ABS_SRCTREE),) 262srctree := $(abs_srctree) 263endif 264 265objtree := . 266VPATH := $(srctree) 267 268export building_out_of_srctree srctree objtree VPATH 269 270# To make sure we do not include .config for any of the *config targets 271# catch them early, and hand them over to scripts/kconfig/Makefile 272# It is allowed to specify more targets when calling make, including 273# mixing *config targets and build targets. 274# For example 'make oldconfig all'. 275# Detect when mixed targets is specified, and make a second invocation 276# of make so .config is not included in this case either (for *config). 277 278version_h := include/generated/uapi/linux/version.h 279 280clean-targets := %clean mrproper cleandocs 281no-dot-config-targets := $(clean-targets) \ 282 cscope gtags TAGS tags help% %docs check% coccicheck \ 283 $(version_h) headers headers_% archheaders archscripts \ 284 %asm-generic kernelversion %src-pkg dt_binding_check \ 285 outputmakefile rustavailable rustfmt rustfmtcheck 286# Installation targets should not require compiler. Unfortunately, vdso_install 287# is an exception where build artifacts may be updated. This must be fixed. 288no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 289 headers_install modules_install kernelrelease image_name 290no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 291 image_name 292single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 293 294config-build := 295mixed-build := 296need-config := 1 297need-compiler := 1 298may-sync-config := 1 299single-build := 300 301ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 302 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 303 need-config := 304 endif 305endif 306 307ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 308 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 309 need-compiler := 310 endif 311endif 312 313ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 314 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 315 may-sync-config := 316 endif 317endif 318 319ifneq ($(KBUILD_EXTMOD),) 320 may-sync-config := 321endif 322 323ifeq ($(KBUILD_EXTMOD),) 324 ifneq ($(filter %config,$(MAKECMDGOALS)),) 325 config-build := 1 326 ifneq ($(words $(MAKECMDGOALS)),1) 327 mixed-build := 1 328 endif 329 endif 330endif 331 332# We cannot build single targets and the others at the same time 333ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 334 single-build := 1 335 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 336 mixed-build := 1 337 endif 338endif 339 340# For "make -j clean all", "make -j mrproper defconfig all", etc. 341ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 342 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 343 mixed-build := 1 344 endif 345endif 346 347# install and modules_install need also be processed one by one 348ifneq ($(filter install,$(MAKECMDGOALS)),) 349 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 350 mixed-build := 1 351 endif 352endif 353 354ifdef mixed-build 355# =========================================================================== 356# We're called with mixed targets (*config and build targets). 357# Handle them one by one. 358 359PHONY += $(MAKECMDGOALS) __build_one_by_one 360 361$(MAKECMDGOALS): __build_one_by_one 362 @: 363 364__build_one_by_one: 365 $(Q)set -e; \ 366 for i in $(MAKECMDGOALS); do \ 367 $(MAKE) -f $(srctree)/Makefile $$i; \ 368 done 369 370else # !mixed-build 371 372include $(srctree)/scripts/Kbuild.include 373 374# Read KERNELRELEASE from include/config/kernel.release (if it exists) 375KERNELRELEASE = $(call read-file, include/config/kernel.release) 376KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 377export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 378 379include $(srctree)/scripts/subarch.include 380 381# Cross compiling and selecting different set of gcc/bin-utils 382# --------------------------------------------------------------------------- 383# 384# When performing cross compilation for other architectures ARCH shall be set 385# to the target architecture. (See arch/* for the possibilities). 386# ARCH can be set during invocation of make: 387# make ARCH=ia64 388# Another way is to have ARCH set in the environment. 389# The default ARCH is the host where make is executed. 390 391# CROSS_COMPILE specify the prefix used for all executables used 392# during compilation. Only gcc and related bin-utils executables 393# are prefixed with $(CROSS_COMPILE). 394# CROSS_COMPILE can be set on the command line 395# make CROSS_COMPILE=ia64-linux- 396# Alternatively CROSS_COMPILE can be set in the environment. 397# Default value for CROSS_COMPILE is not to prefix executables 398# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 399ARCH ?= $(SUBARCH) 400 401# Architecture as present in compile.h 402UTS_MACHINE := $(ARCH) 403SRCARCH := $(ARCH) 404 405# Additional ARCH settings for x86 406ifeq ($(ARCH),i386) 407 SRCARCH := x86 408endif 409ifeq ($(ARCH),x86_64) 410 SRCARCH := x86 411endif 412 413# Additional ARCH settings for sparc 414ifeq ($(ARCH),sparc32) 415 SRCARCH := sparc 416endif 417ifeq ($(ARCH),sparc64) 418 SRCARCH := sparc 419endif 420 421# Additional ARCH settings for parisc 422ifeq ($(ARCH),parisc64) 423 SRCARCH := parisc 424endif 425 426export cross_compiling := 427ifneq ($(SRCARCH),$(SUBARCH)) 428cross_compiling := 1 429endif 430 431KCONFIG_CONFIG ?= .config 432export KCONFIG_CONFIG 433 434# SHELL used by kbuild 435CONFIG_SHELL := sh 436 437HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 438HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 439HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 440 441ifneq ($(LLVM),) 442ifneq ($(filter %/,$(LLVM)),) 443LLVM_PREFIX := $(LLVM) 444else ifneq ($(filter -%,$(LLVM)),) 445LLVM_SUFFIX := $(LLVM) 446endif 447 448HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 449HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 450else 451HOSTCC = gcc 452HOSTCXX = g++ 453endif 454HOSTRUSTC = rustc 455HOSTPKG_CONFIG = pkg-config 456 457KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 458 -O2 -fomit-frame-pointer -std=gnu11 \ 459 -Wdeclaration-after-statement 460KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 461KBUILD_USERLDFLAGS := $(USERLDFLAGS) 462 463# These flags apply to all Rust code in the tree, including the kernel and 464# host programs. 465export rust_common_flags := --edition=2021 \ 466 -Zbinary_dep_depinfo=y \ 467 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 468 -Dunreachable_pub -Dnon_ascii_idents \ 469 -Wmissing_docs \ 470 -Drustdoc::missing_crate_level_docs \ 471 -Dclippy::correctness -Dclippy::style \ 472 -Dclippy::suspicious -Dclippy::complexity \ 473 -Dclippy::perf \ 474 -Dclippy::let_unit_value -Dclippy::mut_mut \ 475 -Dclippy::needless_bitwise_bool \ 476 -Dclippy::needless_continue \ 477 -Wclippy::dbg_macro 478 479KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 480KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 481KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 482 -Zallow-features= $(HOSTRUSTFLAGS) 483KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 484KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 485 486# Make variables (CC, etc...) 487CPP = $(CC) -E 488ifneq ($(LLVM),) 489CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 490LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 491AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 492NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 493OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 494OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 495READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 496STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 497else 498CC = $(CROSS_COMPILE)gcc 499LD = $(CROSS_COMPILE)ld 500AR = $(CROSS_COMPILE)ar 501NM = $(CROSS_COMPILE)nm 502OBJCOPY = $(CROSS_COMPILE)objcopy 503OBJDUMP = $(CROSS_COMPILE)objdump 504READELF = $(CROSS_COMPILE)readelf 505STRIP = $(CROSS_COMPILE)strip 506endif 507RUSTC = rustc 508RUSTDOC = rustdoc 509RUSTFMT = rustfmt 510CLIPPY_DRIVER = clippy-driver 511BINDGEN = bindgen 512CARGO = cargo 513PAHOLE = pahole 514RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 515LEX = flex 516YACC = bison 517AWK = awk 518INSTALLKERNEL := installkernel 519DEPMOD = depmod 520PERL = perl 521PYTHON3 = python3 522CHECK = sparse 523BASH = bash 524KGZIP = gzip 525KBZIP2 = bzip2 526KLZOP = lzop 527LZMA = lzma 528LZ4 = lz4c 529XZ = xz 530ZSTD = zstd 531 532PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 533 534CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 535 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 536NOSTDINC_FLAGS := 537CFLAGS_MODULE = 538RUSTFLAGS_MODULE = 539AFLAGS_MODULE = 540LDFLAGS_MODULE = 541CFLAGS_KERNEL = 542RUSTFLAGS_KERNEL = 543AFLAGS_KERNEL = 544LDFLAGS_vmlinux = 545 546# Use USERINCLUDE when you must reference the UAPI directories only. 547USERINCLUDE := \ 548 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 549 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 550 -I$(srctree)/include/uapi \ 551 -I$(objtree)/include/generated/uapi \ 552 -include $(srctree)/include/linux/compiler-version.h \ 553 -include $(srctree)/include/linux/kconfig.h 554 555# Use LINUXINCLUDE when you must reference the include/ directory. 556# Needed to be compatible with the O= option 557LINUXINCLUDE := \ 558 -I$(srctree)/arch/$(SRCARCH)/include \ 559 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 560 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 561 -I$(objtree)/include \ 562 $(USERINCLUDE) 563 564KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 565KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 566 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 567 -Werror=implicit-function-declaration -Werror=implicit-int \ 568 -Werror=return-type -Wno-format-security -funsigned-char \ 569 -std=gnu11 570KBUILD_CPPFLAGS := -D__KERNEL__ 571KBUILD_RUSTFLAGS := $(rust_common_flags) \ 572 --target=$(objtree)/scripts/target.json \ 573 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 574 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 575 -Csymbol-mangling-version=v0 \ 576 -Crelocation-model=static \ 577 -Zfunction-sections=n \ 578 -Dclippy::float_arithmetic 579 580KBUILD_AFLAGS_KERNEL := 581KBUILD_CFLAGS_KERNEL := 582KBUILD_RUSTFLAGS_KERNEL := 583KBUILD_AFLAGS_MODULE := -DMODULE 584KBUILD_CFLAGS_MODULE := -DMODULE 585KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 586KBUILD_LDFLAGS_MODULE := 587KBUILD_LDFLAGS := 588CLANG_FLAGS := 589 590ifeq ($(KBUILD_CLIPPY),1) 591 RUSTC_OR_CLIPPY_QUIET := CLIPPY 592 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 593else 594 RUSTC_OR_CLIPPY_QUIET := RUSTC 595 RUSTC_OR_CLIPPY = $(RUSTC) 596endif 597 598ifdef RUST_LIB_SRC 599 export RUST_LIB_SRC 600endif 601 602# Allows the usage of unstable features in stable compilers. 603export RUSTC_BOOTSTRAP := 1 604 605export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 606export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 607export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 608export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 609export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 610export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 611export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 612export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 613 614export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 615export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 616export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 617export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 618export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 619export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 620export PAHOLE_FLAGS 621 622# Files to ignore in find ... statements 623 624export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 625 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 626 -prune -o 627export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 628 --exclude CVS --exclude .pc --exclude .hg --exclude .git 629 630# =========================================================================== 631# Rules shared between *config targets and build targets 632 633# Basic helpers built in scripts/basic/ 634PHONY += scripts_basic 635scripts_basic: 636 $(Q)$(MAKE) $(build)=scripts/basic 637 638PHONY += outputmakefile 639ifdef building_out_of_srctree 640# Before starting out-of-tree build, make sure the source tree is clean. 641# outputmakefile generates a Makefile in the output directory, if using a 642# separate output directory. This allows convenient use of make in the 643# output directory. 644# At the same time when output Makefile generated, generate .gitignore to 645# ignore whole output directory 646 647quiet_cmd_makefile = GEN Makefile 648 cmd_makefile = { \ 649 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 650 echo "include $(srctree)/Makefile"; \ 651 } > Makefile 652 653outputmakefile: 654 @if [ -f $(srctree)/.config -o \ 655 -d $(srctree)/include/config -o \ 656 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 657 echo >&2 "***"; \ 658 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 659 echo >&2 "*** in $(abs_srctree)";\ 660 echo >&2 "***"; \ 661 false; \ 662 fi 663 $(Q)ln -fsn $(srctree) source 664 $(call cmd,makefile) 665 $(Q)test -e .gitignore || \ 666 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 667endif 668 669# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 670# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 671# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 672# and from include/config/auto.conf.cmd to detect the compiler upgrade. 673CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 674 675ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 676include $(srctree)/scripts/Makefile.clang 677endif 678 679# Include this also for config targets because some architectures need 680# cc-cross-prefix to determine CROSS_COMPILE. 681ifdef need-compiler 682include $(srctree)/scripts/Makefile.compiler 683endif 684 685ifdef config-build 686# =========================================================================== 687# *config targets only - make sure prerequisites are updated, and descend 688# in scripts/kconfig to make the *config target 689 690# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 691# KBUILD_DEFCONFIG may point out an alternative default configuration 692# used for 'make defconfig' 693include $(srctree)/arch/$(SRCARCH)/Makefile 694export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 695 696config: outputmakefile scripts_basic FORCE 697 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 698 699%config: outputmakefile scripts_basic FORCE 700 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 701 702else #!config-build 703# =========================================================================== 704# Build targets only - this includes vmlinux, arch specific targets, clean 705# targets and others. In general all targets except *config targets. 706 707# If building an external module we do not care about the all: rule 708# but instead __all depend on modules 709PHONY += all 710ifeq ($(KBUILD_EXTMOD),) 711__all: all 712else 713__all: modules 714endif 715 716targets := 717 718# Decide whether to build built-in, modular, or both. 719# Normally, just do built-in. 720 721KBUILD_MODULES := 722KBUILD_BUILTIN := 1 723 724# If we have only "make modules", don't compile built-in objects. 725ifeq ($(MAKECMDGOALS),modules) 726 KBUILD_BUILTIN := 727endif 728 729# If we have "make <whatever> modules", compile modules 730# in addition to whatever we do anyway. 731# Just "make" or "make all" shall build modules as well 732 733ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 734 KBUILD_MODULES := 1 735endif 736 737ifeq ($(MAKECMDGOALS),) 738 KBUILD_MODULES := 1 739endif 740 741export KBUILD_MODULES KBUILD_BUILTIN 742 743ifdef need-config 744include include/config/auto.conf 745endif 746 747ifeq ($(KBUILD_EXTMOD),) 748# Objects we will link into vmlinux / subdirs we need to visit 749core-y := 750drivers-y := 751libs-y := lib/ 752endif # KBUILD_EXTMOD 753 754# The all: target is the default when no target is given on the 755# command line. 756# This allow a user to issue only 'make' to build a kernel including modules 757# Defaults to vmlinux, but the arch makefile usually adds further targets 758all: vmlinux 759 760CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 761ifdef CONFIG_CC_IS_GCC 762CFLAGS_GCOV += -fno-tree-loop-im 763endif 764export CFLAGS_GCOV 765 766# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 767ifdef CONFIG_FUNCTION_TRACER 768 CC_FLAGS_FTRACE := -pg 769endif 770 771include $(srctree)/arch/$(SRCARCH)/Makefile 772 773ifdef need-config 774ifdef may-sync-config 775# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 776# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 777# because some architectures define CROSS_COMPILE there. 778include include/config/auto.conf.cmd 779 780$(KCONFIG_CONFIG): 781 @echo >&2 '***' 782 @echo >&2 '*** Configuration file "$@" not found!' 783 @echo >&2 '***' 784 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 785 @echo >&2 '*** "make menuconfig" or "make xconfig").' 786 @echo >&2 '***' 787 @/bin/false 788 789# The actual configuration files used during the build are stored in 790# include/generated/ and include/config/. Update them if .config is newer than 791# include/config/auto.conf (which mirrors .config). 792# 793# This exploits the 'multi-target pattern rule' trick. 794# The syncconfig should be executed only once to make all the targets. 795# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 796# 797# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 798# so you cannot notice that Kconfig is waiting for the user input. 799%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 800 $(Q)$(kecho) " SYNC $@" 801 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 802else # !may-sync-config 803# External modules and some install targets need include/generated/autoconf.h 804# and include/config/auto.conf but do not care if they are up-to-date. 805# Use auto.conf to trigger the test 806PHONY += include/config/auto.conf 807 808include/config/auto.conf: 809 @test -e include/generated/autoconf.h -a -e $@ || ( \ 810 echo >&2; \ 811 echo >&2 " ERROR: Kernel configuration is invalid."; \ 812 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 813 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 814 echo >&2 ; \ 815 /bin/false) 816 817endif # may-sync-config 818endif # need-config 819 820KBUILD_CFLAGS += -fno-delete-null-pointer-checks 821KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 822KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 823KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 824KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 825 826ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 827KBUILD_CFLAGS += -O2 828KBUILD_RUSTFLAGS += -Copt-level=2 829else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 830KBUILD_CFLAGS += -Os 831KBUILD_RUSTFLAGS += -Copt-level=s 832endif 833 834# Always set `debug-assertions` and `overflow-checks` because their default 835# depends on `opt-level` and `debug-assertions`, respectively. 836KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 837KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 838 839# Tell gcc to never replace conditional load with a non-conditional one 840ifdef CONFIG_CC_IS_GCC 841# gcc-10 renamed --param=allow-store-data-races=0 to 842# -fno-allow-store-data-races. 843KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 844KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 845endif 846 847ifdef CONFIG_READABLE_ASM 848# Disable optimizations that make assembler listings hard to read. 849# reorder blocks reorders the control in the function 850# ipa clone creates specialized cloned functions 851# partial inlining inlines only parts of functions 852KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 853endif 854 855ifneq ($(CONFIG_FRAME_WARN),0) 856KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 857endif 858 859stackp-flags-y := -fno-stack-protector 860stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 861stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 862 863KBUILD_CFLAGS += $(stackp-flags-y) 864 865KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 866KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 867KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 868 869KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 870KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 871 872ifdef CONFIG_CC_IS_CLANG 873# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 874KBUILD_CFLAGS += -Wno-gnu 875else 876 877# gcc inanely warns about local variables called 'main' 878KBUILD_CFLAGS += -Wno-main 879endif 880 881# These warnings generated too much noise in a regular build. 882# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 883KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 884KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 885 886# These result in bogus false positives 887KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 888 889ifdef CONFIG_FRAME_POINTER 890KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 891KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 892else 893# Some targets (ARM with Thumb2, for example), can't be built with frame 894# pointers. For those, we don't have FUNCTION_TRACER automatically 895# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 896# incompatible with -fomit-frame-pointer with current GCC, so we don't use 897# -fomit-frame-pointer with FUNCTION_TRACER. 898# In the Rust target specification, "frame-pointer" is set explicitly 899# to "may-omit". 900ifndef CONFIG_FUNCTION_TRACER 901KBUILD_CFLAGS += -fomit-frame-pointer 902endif 903endif 904 905# Initialize all stack variables with a 0xAA pattern. 906ifdef CONFIG_INIT_STACK_ALL_PATTERN 907KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 908endif 909 910# Initialize all stack variables with a zero value. 911ifdef CONFIG_INIT_STACK_ALL_ZERO 912KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 913ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 914# https://github.com/llvm/llvm-project/issues/44842 915CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 916export CC_AUTO_VAR_INIT_ZERO_ENABLER 917KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 918endif 919endif 920 921# While VLAs have been removed, GCC produces unreachable stack probes 922# for the randomize_kstack_offset feature. Disable it for all compilers. 923KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 924 925# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 926ifdef CONFIG_ZERO_CALL_USED_REGS 927KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 928endif 929 930ifdef CONFIG_FUNCTION_TRACER 931ifdef CONFIG_FTRACE_MCOUNT_USE_CC 932 CC_FLAGS_FTRACE += -mrecord-mcount 933 ifdef CONFIG_HAVE_NOP_MCOUNT 934 ifeq ($(call cc-option-yn, -mnop-mcount),y) 935 CC_FLAGS_FTRACE += -mnop-mcount 936 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 937 endif 938 endif 939endif 940ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 941 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 942 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 943 endif 944endif 945ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 946 ifdef CONFIG_HAVE_C_RECORDMCOUNT 947 BUILD_C_RECORDMCOUNT := y 948 export BUILD_C_RECORDMCOUNT 949 endif 950endif 951ifdef CONFIG_HAVE_FENTRY 952 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 953 ifeq ($(call cc-option-yn, -mfentry),y) 954 CC_FLAGS_FTRACE += -mfentry 955 CC_FLAGS_USING += -DCC_USING_FENTRY 956 endif 957endif 958export CC_FLAGS_FTRACE 959KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 960KBUILD_AFLAGS += $(CC_FLAGS_USING) 961endif 962 963# We trigger additional mismatches with less inlining 964ifdef CONFIG_DEBUG_SECTION_MISMATCH 965KBUILD_CFLAGS += -fno-inline-functions-called-once 966endif 967 968# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 969ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 970KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 971KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 972LDFLAGS_vmlinux += --gc-sections 973endif 974 975ifdef CONFIG_SHADOW_CALL_STACK 976ifndef CONFIG_DYNAMIC_SCS 977CC_FLAGS_SCS := -fsanitize=shadow-call-stack 978KBUILD_CFLAGS += $(CC_FLAGS_SCS) 979endif 980export CC_FLAGS_SCS 981endif 982 983ifdef CONFIG_LTO_CLANG 984ifdef CONFIG_LTO_CLANG_THIN 985CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 986KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 987else 988CC_FLAGS_LTO := -flto 989endif 990CC_FLAGS_LTO += -fvisibility=hidden 991 992# Limit inlining across translation units to reduce binary size 993KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 994 995# Check for frame size exceeding threshold during prolog/epilog insertion 996# when using lld < 13.0.0. 997ifneq ($(CONFIG_FRAME_WARN),0) 998ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 999KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 1000endif 1001endif 1002endif 1003 1004ifdef CONFIG_LTO 1005KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1006KBUILD_AFLAGS += -fno-lto 1007export CC_FLAGS_LTO 1008endif 1009 1010ifdef CONFIG_CFI_CLANG 1011CC_FLAGS_CFI := -fsanitize=kcfi 1012KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1013export CC_FLAGS_CFI 1014endif 1015 1016ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1017KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1018endif 1019 1020# arch Makefile may override CC so keep this after arch Makefile is included 1021NOSTDINC_FLAGS += -nostdinc 1022 1023# warn about C99 declaration after statement 1024KBUILD_CFLAGS += -Wdeclaration-after-statement 1025 1026# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1027KBUILD_CFLAGS += -Wvla 1028 1029# disable pointer signed / unsigned warnings in gcc 4.0 1030KBUILD_CFLAGS += -Wno-pointer-sign 1031 1032# In order to make sure new function cast mismatches are not introduced 1033# in the kernel (to avoid tripping CFI checking), the kernel should be 1034# globally built with -Wcast-function-type. 1035KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1036 1037# disable stringop warnings in gcc 8+ 1038KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1039 1040# We'll want to enable this eventually, but it's not going away for 5.7 at least 1041KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1042 1043# Another good warning that we'll want to enable eventually 1044KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1045 1046# Enabled with W=2, disabled by default as noisy 1047ifdef CONFIG_CC_IS_GCC 1048KBUILD_CFLAGS += -Wno-maybe-uninitialized 1049endif 1050 1051# The allocators already balk at large sizes, so silence the compiler 1052# warnings for bounds checks involving those possible values. While 1053# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1054# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1055# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1056# doesn't work (as it is documented to), silently resolving to "0" prior to 1057# version 9.1 (and producing an error more recently). Numeric values larger 1058# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1059# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1060# choice, we must perform a versioned check to disable this warning. 1061# https://lore.kernel.org/lkml/[email protected] 1062KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1063KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1064 1065# disable invalid "can't wrap" optimizations for signed / pointers 1066KBUILD_CFLAGS += -fno-strict-overflow 1067 1068# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1069KBUILD_CFLAGS += -fno-stack-check 1070 1071# conserve stack if available 1072ifdef CONFIG_CC_IS_GCC 1073KBUILD_CFLAGS += -fconserve-stack 1074endif 1075 1076# Prohibit date/time macros, which would make the build non-deterministic 1077KBUILD_CFLAGS += -Werror=date-time 1078 1079# enforce correct pointer usage 1080KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1081 1082# Require designated initializers for all marked structures 1083KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1084 1085# change __FILE__ to the relative path from the srctree 1086KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1087 1088# include additional Makefiles when needed 1089include-y := scripts/Makefile.extrawarn 1090include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1091include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1092include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1093include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1094include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1095include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1096include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1097include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1098 1099include $(addprefix $(srctree)/, $(include-y)) 1100 1101# scripts/Makefile.gcc-plugins is intentionally included last. 1102# Do not add $(call cc-option,...) below this line. When you build the kernel 1103# from the clean source tree, the GCC plugins do not exist at this point. 1104 1105# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1106KBUILD_CPPFLAGS += $(KCPPFLAGS) 1107KBUILD_AFLAGS += $(KAFLAGS) 1108KBUILD_CFLAGS += $(KCFLAGS) 1109KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1110 1111KBUILD_LDFLAGS_MODULE += --build-id=sha1 1112LDFLAGS_vmlinux += --build-id=sha1 1113 1114KBUILD_LDFLAGS += -z noexecstack 1115ifeq ($(CONFIG_LD_IS_BFD),y) 1116KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1117endif 1118 1119ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1120LDFLAGS_vmlinux += -X 1121endif 1122 1123ifeq ($(CONFIG_RELR),y) 1124LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1125endif 1126 1127# We never want expected sections to be placed heuristically by the 1128# linker. All sections should be explicitly named in the linker script. 1129ifdef CONFIG_LD_ORPHAN_WARN 1130LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1131endif 1132 1133# Align the bit size of userspace programs with the kernel 1134KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1135KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1136 1137# make the checker run with the right architecture 1138CHECKFLAGS += --arch=$(ARCH) 1139 1140# insure the checker run with the right endianness 1141CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1142 1143# the checker needs the correct machine size 1144CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1145 1146# Default kernel image to build when no specific target is given. 1147# KBUILD_IMAGE may be overruled on the command line or 1148# set in the environment 1149# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1150# this default value 1151export KBUILD_IMAGE ?= vmlinux 1152 1153# 1154# INSTALL_PATH specifies where to place the updated kernel and system map 1155# images. Default is /boot, but you can set it to other values 1156export INSTALL_PATH ?= /boot 1157 1158# 1159# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1160# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1161# an argument if needed. Otherwise it defaults to the kernel install path 1162# 1163export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1164 1165# 1166# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1167# relocations required by build roots. This is not defined in the 1168# makefile but the argument can be passed to make if needed. 1169# 1170 1171MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1172export MODLIB 1173 1174PHONY += prepare0 1175 1176export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1177export MODORDER := $(extmod_prefix)modules.order 1178export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1179 1180ifeq ($(KBUILD_EXTMOD),) 1181 1182build-dir := . 1183clean-dirs := $(sort . Documentation \ 1184 $(patsubst %/,%,$(filter %/, $(core-) \ 1185 $(drivers-) $(libs-)))) 1186 1187export ARCH_CORE := $(core-y) 1188export ARCH_LIB := $(filter %/, $(libs-y)) 1189export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1190# Externally visible symbols (used by link-vmlinux.sh) 1191 1192KBUILD_VMLINUX_OBJS := ./built-in.a 1193ifdef CONFIG_MODULES 1194KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1195KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1196else 1197KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1198endif 1199 1200export KBUILD_VMLINUX_LIBS 1201export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1202 1203# Recurse until adjust_autoksyms.sh is satisfied 1204PHONY += autoksyms_recursive 1205ifdef CONFIG_TRIM_UNUSED_KSYMS 1206# For the kernel to actually contain only the needed exported symbols, 1207# we have to build modules as well to determine what those symbols are. 1208# (this can be evaluated only once include/config/auto.conf has been included) 1209KBUILD_MODULES := 1 1210 1211autoksyms_recursive: $(build-dir) modules.order 1212 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1213 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1214endif 1215 1216autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1217 1218quiet_cmd_autoksyms_h = GEN $@ 1219 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1220 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1221 1222$(autoksyms_h): 1223 $(call cmd,autoksyms_h) 1224 1225# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1226quiet_cmd_ar_vmlinux.a = AR $@ 1227 cmd_ar_vmlinux.a = \ 1228 rm -f $@; \ 1229 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1230 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1231 1232targets += vmlinux.a 1233vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1234 $(call if_changed,ar_vmlinux.a) 1235 1236PHONY += vmlinux_o 1237vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1238 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1239 1240vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1241 @: 1242 1243PHONY += vmlinux 1244# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1245# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1246# unrelated; the decompressors just happen to have the same base name, 1247# arch/*/boot/compressed/vmlinux. 1248# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1249# 1250# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1251# https://savannah.gnu.org/bugs/?61463 1252# For Make > 4.4, the following simple code will work: 1253# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1254vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1255vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1256vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1257 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1258 1259# The actual objects are generated when descending, 1260# make sure no implicit rule kicks in 1261$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1262 1263ifeq ($(origin KERNELRELEASE),file) 1264filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1265else 1266filechk_kernel.release = echo $(KERNELRELEASE) 1267endif 1268 1269# Store (new) KERNELRELEASE string in include/config/kernel.release 1270include/config/kernel.release: FORCE 1271 $(call filechk,kernel.release) 1272 1273# Additional helpers built in scripts/ 1274# Carefully list dependencies so we do not try to build scripts twice 1275# in parallel 1276PHONY += scripts 1277scripts: scripts_basic scripts_dtc 1278 $(Q)$(MAKE) $(build)=$(@) 1279 1280# Things we need to do before we recursively start building the kernel 1281# or the modules are listed in "prepare". 1282# A multi level approach is used. prepareN is processed before prepareN-1. 1283# archprepare is used in arch Makefiles and when processed asm symlink, 1284# version.h and scripts_basic is processed / created. 1285 1286PHONY += prepare archprepare 1287 1288archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1289 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1290 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1291 1292prepare0: archprepare 1293 $(Q)$(MAKE) $(build)=scripts/mod 1294 $(Q)$(MAKE) $(build)=. prepare 1295 1296# All the preparing.. 1297prepare: prepare0 1298ifdef CONFIG_RUST 1299 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1300 $(Q)$(MAKE) $(build)=rust 1301endif 1302 1303PHONY += remove-stale-files 1304remove-stale-files: 1305 $(Q)$(srctree)/scripts/remove-stale-files 1306 1307# Support for using generic headers in asm-generic 1308asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1309 1310PHONY += asm-generic uapi-asm-generic 1311asm-generic: uapi-asm-generic 1312 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1313 generic=include/asm-generic 1314uapi-asm-generic: 1315 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1316 generic=include/uapi/asm-generic 1317 1318# Generate some files 1319# --------------------------------------------------------------------------- 1320 1321# KERNELRELEASE can change from a few different places, meaning version.h 1322# needs to be updated, so this check is forced on all builds 1323 1324uts_len := 64 1325define filechk_utsrelease.h 1326 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1327 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1328 exit 1; \ 1329 fi; \ 1330 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1331endef 1332 1333define filechk_version.h 1334 if [ $(SUBLEVEL) -gt 255 ]; then \ 1335 echo \#define LINUX_VERSION_CODE $(shell \ 1336 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1337 else \ 1338 echo \#define LINUX_VERSION_CODE $(shell \ 1339 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1340 fi; \ 1341 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1342 ((c) > 255 ? 255 : (c)))'; \ 1343 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1344 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1345 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1346endef 1347 1348$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1349$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1350$(version_h): FORCE 1351 $(call filechk,version.h) 1352 1353include/generated/utsrelease.h: include/config/kernel.release FORCE 1354 $(call filechk,utsrelease.h) 1355 1356filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1357 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1358 1359include/generated/compile.h: FORCE 1360 $(call filechk,compile.h) 1361 1362PHONY += headerdep 1363headerdep: 1364 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1365 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1366 1367# --------------------------------------------------------------------------- 1368# Kernel headers 1369 1370#Default location for installed headers 1371export INSTALL_HDR_PATH = $(objtree)/usr 1372 1373quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1374 cmd_headers_install = \ 1375 mkdir -p $(INSTALL_HDR_PATH); \ 1376 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1377 usr/include $(INSTALL_HDR_PATH) 1378 1379PHONY += headers_install 1380headers_install: headers 1381 $(call cmd,headers_install) 1382 1383PHONY += archheaders archscripts 1384 1385hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1386 1387PHONY += headers 1388headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1389 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1390 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1391 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1392 1393ifdef CONFIG_HEADERS_INSTALL 1394prepare: headers 1395endif 1396 1397PHONY += scripts_unifdef 1398scripts_unifdef: scripts_basic 1399 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1400 1401# --------------------------------------------------------------------------- 1402# Install 1403 1404# Many distributions have the custom install script, /sbin/installkernel. 1405# If DKMS is installed, 'make install' will eventually recurse back 1406# to this Makefile to build and install external modules. 1407# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1408 1409quiet_cmd_install = INSTALL $(INSTALL_PATH) 1410 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1411 1412# --------------------------------------------------------------------------- 1413# Tools 1414 1415ifdef CONFIG_OBJTOOL 1416prepare: tools/objtool 1417endif 1418 1419ifdef CONFIG_BPF 1420ifdef CONFIG_DEBUG_INFO_BTF 1421prepare: tools/bpf/resolve_btfids 1422endif 1423endif 1424 1425PHONY += resolve_btfids_clean 1426 1427resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1428 1429# tools/bpf/resolve_btfids directory might not exist 1430# in output directory, skip its clean in that case 1431resolve_btfids_clean: 1432ifneq ($(wildcard $(resolve_btfids_O)),) 1433 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1434endif 1435 1436# Clear a bunch of variables before executing the submake 1437ifeq ($(quiet),silent_) 1438tools_silent=s 1439endif 1440 1441tools/: FORCE 1442 $(Q)mkdir -p $(objtree)/tools 1443 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1444 1445tools/%: FORCE 1446 $(Q)mkdir -p $(objtree)/tools 1447 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1448 1449# --------------------------------------------------------------------------- 1450# Kernel selftest 1451 1452PHONY += kselftest 1453kselftest: headers 1454 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1455 1456kselftest-%: headers FORCE 1457 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1458 1459PHONY += kselftest-merge 1460kselftest-merge: 1461 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1462 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1463 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1464 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1465 1466# --------------------------------------------------------------------------- 1467# Devicetree files 1468 1469ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1470dtstree := arch/$(SRCARCH)/boot/dts 1471endif 1472 1473ifneq ($(dtstree),) 1474 1475%.dtb: dtbs_prepare 1476 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1477 1478%.dtbo: dtbs_prepare 1479 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1480 1481PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1482dtbs: dtbs_prepare 1483 $(Q)$(MAKE) $(build)=$(dtstree) 1484 1485# include/config/kernel.release is actually needed when installing DTBs because 1486# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1487# dtbs_install depend on it as dtbs_install may run as root. 1488dtbs_prepare: include/config/kernel.release scripts_dtc 1489 1490ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1491export CHECK_DTBS=y 1492dtbs: dt_binding_check 1493endif 1494 1495dtbs_check: dtbs 1496 1497dtbs_install: 1498 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1499 1500ifdef CONFIG_OF_EARLY_FLATTREE 1501all: dtbs 1502endif 1503 1504endif 1505 1506PHONY += scripts_dtc 1507scripts_dtc: scripts_basic 1508 $(Q)$(MAKE) $(build)=scripts/dtc 1509 1510ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1511export CHECK_DT_BINDING=y 1512endif 1513 1514PHONY += dt_binding_check 1515dt_binding_check: scripts_dtc 1516 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1517 1518PHONY += dt_compatible_check 1519dt_compatible_check: dt_binding_check 1520 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1521 1522# --------------------------------------------------------------------------- 1523# Modules 1524 1525ifdef CONFIG_MODULES 1526 1527# By default, build modules as well 1528 1529all: modules 1530 1531# When we're building modules with modversions, we need to consider 1532# the built-in objects during the descend as well, in order to 1533# make sure the checksums are up to date before we record them. 1534ifdef CONFIG_MODVERSIONS 1535 KBUILD_BUILTIN := 1 1536endif 1537 1538# Build modules 1539# 1540 1541# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES 1542# is an exception. 1543ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1544KBUILD_BUILTIN := 1 1545modules: vmlinux 1546endif 1547 1548modules: modules_prepare 1549 1550# Target to prepare building external modules 1551modules_prepare: prepare 1552 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1553 1554export modules_sign_only := 1555 1556ifeq ($(CONFIG_MODULE_SIG),y) 1557PHONY += modules_sign 1558modules_sign: modules_install 1559 @: 1560 1561# modules_sign is a subset of modules_install. 1562# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1563ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1564modules_sign_only := y 1565endif 1566endif 1567 1568modinst_pre := 1569ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1570modinst_pre := __modinst_pre 1571endif 1572 1573modules_install: $(modinst_pre) 1574PHONY += __modinst_pre 1575__modinst_pre: 1576 @rm -rf $(MODLIB)/kernel 1577 @rm -f $(MODLIB)/source 1578 @mkdir -p $(MODLIB)/kernel 1579 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1580 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1581 rm -f $(MODLIB)/build ; \ 1582 ln -s $(CURDIR) $(MODLIB)/build ; \ 1583 fi 1584 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1585 @cp -f modules.builtin $(MODLIB)/ 1586 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1587 1588endif # CONFIG_MODULES 1589 1590### 1591# Cleaning is done on three levels. 1592# make clean Delete most generated files 1593# Leave enough to build external modules 1594# make mrproper Delete the current configuration, and all generated files 1595# make distclean Remove editor backup files, patch leftover files and the like 1596 1597# Directories & files removed with 'make clean' 1598CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1599 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1600 compile_commands.json .thinlto-cache rust/test rust/doc \ 1601 .vmlinux.objs .vmlinux.export.c 1602 1603# Directories & files removed with 'make mrproper' 1604MRPROPER_FILES += include/config include/generated \ 1605 arch/$(SRCARCH)/include/generated .objdiff \ 1606 debian snap tar-install \ 1607 .config .config.old .version \ 1608 Module.symvers \ 1609 certs/signing_key.pem \ 1610 certs/x509.genkey \ 1611 vmlinux-gdb.py \ 1612 *.spec \ 1613 rust/libmacros.so 1614 1615# clean - Delete most, but leave enough to build external modules 1616# 1617clean: rm-files := $(CLEAN_FILES) 1618 1619PHONY += archclean vmlinuxclean 1620 1621vmlinuxclean: 1622 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1623 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1624 1625clean: archclean vmlinuxclean resolve_btfids_clean 1626 1627# mrproper - Delete all generated files, including .config 1628# 1629mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1630mrproper-dirs := $(addprefix _mrproper_,scripts) 1631 1632PHONY += $(mrproper-dirs) mrproper 1633$(mrproper-dirs): 1634 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1635 1636mrproper: clean $(mrproper-dirs) 1637 $(call cmd,rmfiles) 1638 @find . $(RCS_FIND_IGNORE) \ 1639 \( -name '*.rmeta' \) \ 1640 -type f -print | xargs rm -f 1641 1642# distclean 1643# 1644PHONY += distclean 1645 1646distclean: mrproper 1647 @find . $(RCS_FIND_IGNORE) \ 1648 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1649 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1650 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1651 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1652 -type f -print | xargs rm -f 1653 1654 1655# Packaging of the kernel to various formats 1656# --------------------------------------------------------------------------- 1657 1658%src-pkg: FORCE 1659 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1660%pkg: include/config/kernel.release FORCE 1661 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1662 1663# Brief documentation of the typical targets used 1664# --------------------------------------------------------------------------- 1665 1666boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1667boards := $(sort $(notdir $(boards))) 1668board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1669board-dirs := $(sort $(notdir $(board-dirs:/=))) 1670 1671PHONY += help 1672help: 1673 @echo 'Cleaning targets:' 1674 @echo ' clean - Remove most generated files but keep the config and' 1675 @echo ' enough build support to build external modules' 1676 @echo ' mrproper - Remove all generated files + config + various backup files' 1677 @echo ' distclean - mrproper + remove editor backup and patch files' 1678 @echo '' 1679 @echo 'Configuration targets:' 1680 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1681 @echo '' 1682 @echo 'Other generic targets:' 1683 @echo ' all - Build all targets marked with [*]' 1684 @echo '* vmlinux - Build the bare kernel' 1685 @echo '* modules - Build all modules' 1686 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1687 @echo ' dir/ - Build all files in dir and below' 1688 @echo ' dir/file.[ois] - Build specified target only' 1689 @echo ' dir/file.ll - Build the LLVM assembly file' 1690 @echo ' (requires compiler support for LLVM assembly generation)' 1691 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1692 @echo ' (requires a recent binutils and recent build (System.map))' 1693 @echo ' dir/file.ko - Build module including final link' 1694 @echo ' modules_prepare - Set up for building external modules' 1695 @echo ' tags/TAGS - Generate tags file for editors' 1696 @echo ' cscope - Generate cscope index' 1697 @echo ' gtags - Generate GNU GLOBAL index' 1698 @echo ' kernelrelease - Output the release version string (use with make -s)' 1699 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1700 @echo ' image_name - Output the image name (use with make -s)' 1701 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1702 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1703 echo '' 1704 @echo 'Static analysers:' 1705 @echo ' checkstack - Generate a list of stack hogs' 1706 @echo ' versioncheck - Sanity check on version.h usage' 1707 @echo ' includecheck - Check for duplicate included header files' 1708 @echo ' export_report - List the usages of all exported symbols' 1709 @echo ' headerdep - Detect inclusion cycles in headers' 1710 @echo ' coccicheck - Check with Coccinelle' 1711 @echo ' clang-analyzer - Check with clang static analyzer' 1712 @echo ' clang-tidy - Check with clang-tidy' 1713 @echo '' 1714 @echo 'Tools:' 1715 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1716 @echo '' 1717 @echo 'Kernel selftest:' 1718 @echo ' kselftest - Build and run kernel selftest' 1719 @echo ' Build, install, and boot kernel before' 1720 @echo ' running kselftest on it' 1721 @echo ' Run as root for full coverage' 1722 @echo ' kselftest-all - Build kernel selftest' 1723 @echo ' kselftest-install - Build and install kernel selftest' 1724 @echo ' kselftest-clean - Remove all generated kselftest files' 1725 @echo ' kselftest-merge - Merge all the config dependencies of' 1726 @echo ' kselftest to existing .config.' 1727 @echo '' 1728 @echo 'Rust targets:' 1729 @echo ' rustavailable - Checks whether the Rust toolchain is' 1730 @echo ' available and, if not, explains why.' 1731 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1732 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1733 @echo ' is formatted, printing a diff otherwise.' 1734 @echo ' rustdoc - Generate Rust documentation' 1735 @echo ' (requires kernel .config)' 1736 @echo ' rusttest - Runs the Rust tests' 1737 @echo ' (requires kernel .config; downloads external repos)' 1738 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1739 @echo ' (requires kernel .config)' 1740 @echo ' dir/file.[os] - Build specified target only' 1741 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1742 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1743 @echo ' The output is not intended to be compilable.' 1744 @echo ' dir/file.ll - Build the LLVM assembly file' 1745 @echo '' 1746 @$(if $(dtstree), \ 1747 echo 'Devicetree:'; \ 1748 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1749 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1750 echo ' dt_binding_check - Validate device tree binding documents'; \ 1751 echo ' dtbs_check - Validate device tree source files';\ 1752 echo '') 1753 1754 @echo 'Userspace tools targets:' 1755 @echo ' use "make tools/help"' 1756 @echo ' or "cd tools; make help"' 1757 @echo '' 1758 @echo 'Kernel packaging:' 1759 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1760 @echo '' 1761 @echo 'Documentation targets:' 1762 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1763 @echo '' 1764 @echo 'Architecture specific targets ($(SRCARCH)):' 1765 @$(or $(archhelp),\ 1766 echo ' No architecture specific help defined for $(SRCARCH)') 1767 @echo '' 1768 @$(if $(boards), \ 1769 $(foreach b, $(boards), \ 1770 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1771 echo '') 1772 @$(if $(board-dirs), \ 1773 $(foreach b, $(board-dirs), \ 1774 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1775 printf " %-16s - Show all of the above\\n" help-boards; \ 1776 echo '') 1777 1778 @echo ' make V=n [targets] 1: verbose build' 1779 @echo ' 2: give reason for rebuild of target' 1780 @echo ' V=1 and V=2 can be combined with V=12' 1781 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1782 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1783 @echo ' (sparse by default)' 1784 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1785 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1786 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1787 @echo ' 1: warnings which may be relevant and do not occur too often' 1788 @echo ' 2: warnings which occur quite often but may still be relevant' 1789 @echo ' 3: more obscure warnings, can most likely be ignored' 1790 @echo ' e: warnings are being treated as errors' 1791 @echo ' Multiple levels can be combined with W=12 or W=123' 1792 @echo '' 1793 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1794 @echo 'For further info see the ./README file' 1795 1796 1797help-board-dirs := $(addprefix help-,$(board-dirs)) 1798 1799help-boards: $(help-board-dirs) 1800 1801boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1802 1803$(help-board-dirs): help-%: 1804 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1805 @$(if $(boards-per-dir), \ 1806 $(foreach b, $(boards-per-dir), \ 1807 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1808 echo '') 1809 1810 1811# Documentation targets 1812# --------------------------------------------------------------------------- 1813DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1814 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1815PHONY += $(DOC_TARGETS) 1816$(DOC_TARGETS): 1817 $(Q)$(MAKE) $(build)=Documentation $@ 1818 1819 1820# Rust targets 1821# --------------------------------------------------------------------------- 1822 1823# "Is Rust available?" target 1824PHONY += rustavailable 1825rustavailable: 1826 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1827 1828# Documentation target 1829# 1830# Using the singular to avoid running afoul of `no-dot-config-targets`. 1831PHONY += rustdoc 1832rustdoc: prepare 1833 $(Q)$(MAKE) $(build)=rust $@ 1834 1835# Testing target 1836PHONY += rusttest 1837rusttest: prepare 1838 $(Q)$(MAKE) $(build)=rust $@ 1839 1840# Formatting targets 1841PHONY += rustfmt rustfmtcheck 1842 1843# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1844# 1845# We match using absolute paths since `find` does not resolve them 1846# when matching, which is a problem when e.g. `srctree` is `..`. 1847# We `grep` afterwards in order to remove the directory entry itself. 1848rustfmt: 1849 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1850 -o -path $(abs_srctree)/rust/alloc -prune \ 1851 -o -path $(abs_objtree)/rust/test -prune \ 1852 | grep -Fv $(abs_srctree)/rust/alloc \ 1853 | grep -Fv $(abs_objtree)/rust/test \ 1854 | grep -Fv generated \ 1855 | xargs $(RUSTFMT) $(rustfmt_flags) 1856 1857rustfmtcheck: rustfmt_flags = --check 1858rustfmtcheck: rustfmt 1859 1860# IDE support targets 1861PHONY += rust-analyzer 1862rust-analyzer: 1863 $(Q)$(MAKE) $(build)=rust $@ 1864 1865# Misc 1866# --------------------------------------------------------------------------- 1867 1868PHONY += misc-check 1869misc-check: 1870 $(Q)$(srctree)/scripts/misc-check 1871 1872all: misc-check 1873 1874PHONY += scripts_gdb 1875scripts_gdb: prepare0 1876 $(Q)$(MAKE) $(build)=scripts/gdb 1877 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1878 1879ifdef CONFIG_GDB_SCRIPTS 1880all: scripts_gdb 1881endif 1882 1883else # KBUILD_EXTMOD 1884 1885### 1886# External module support. 1887# When building external modules the kernel used as basis is considered 1888# read-only, and no consistency checks are made and the make 1889# system is not used on the basis kernel. If updates are required 1890# in the basis kernel ordinary make commands (without M=...) must be used. 1891 1892# We are always building only modules. 1893KBUILD_BUILTIN := 1894KBUILD_MODULES := 1 1895 1896build-dir := $(KBUILD_EXTMOD) 1897 1898compile_commands.json: $(extmod_prefix)compile_commands.json 1899PHONY += compile_commands.json 1900 1901clean-dirs := $(KBUILD_EXTMOD) 1902clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1903 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1904 1905PHONY += prepare 1906# now expand this into a simple variable to reduce the cost of shell evaluations 1907prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1908prepare: 1909 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1910 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1911 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1912 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1913 fi 1914 1915PHONY += help 1916help: 1917 @echo ' Building external modules.' 1918 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1919 @echo '' 1920 @echo ' modules - default target, build the module(s)' 1921 @echo ' modules_install - install the module' 1922 @echo ' clean - remove generated files in module directory only' 1923 @echo '' 1924 1925endif # KBUILD_EXTMOD 1926 1927# --------------------------------------------------------------------------- 1928# Modules 1929 1930PHONY += modules modules_install modules_prepare 1931 1932ifdef CONFIG_MODULES 1933 1934$(MODORDER): $(build-dir) 1935 @: 1936 1937# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1938# This is solely useful to speed up test compiles. 1939modules: modpost 1940ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1941 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1942endif 1943 1944PHONY += modules_check 1945modules_check: $(MODORDER) 1946 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1947 1948quiet_cmd_depmod = DEPMOD $(MODLIB) 1949 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1950 $(KERNELRELEASE) 1951 1952modules_install: 1953 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1954 $(call cmd,depmod) 1955 1956else # CONFIG_MODULES 1957 1958# Modules not configured 1959# --------------------------------------------------------------------------- 1960 1961modules modules_install: 1962 @echo >&2 '***' 1963 @echo >&2 '*** The present kernel configuration has modules disabled.' 1964 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1965 @echo >&2 '*** to enable CONFIG_MODULES.' 1966 @echo >&2 '***' 1967 @exit 1 1968 1969KBUILD_MODULES := 1970 1971endif # CONFIG_MODULES 1972 1973PHONY += modpost 1974modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1975 $(if $(KBUILD_MODULES), modules_check) 1976 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1977 1978# Single targets 1979# --------------------------------------------------------------------------- 1980# To build individual files in subdirectories, you can do like this: 1981# 1982# make foo/bar/baz.s 1983# 1984# The supported suffixes for single-target are listed in 'single-targets' 1985# 1986# To build only under specific subdirectories, you can do like this: 1987# 1988# make foo/bar/baz/ 1989 1990ifdef single-build 1991 1992# .ko is special because modpost is needed 1993single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1994single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1995 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1996 1997$(single-ko): single_modules 1998 @: 1999$(single-no-ko): $(build-dir) 2000 @: 2001 2002# Remove MODORDER when done because it is not the real one. 2003PHONY += single_modules 2004single_modules: $(single-no-ko) modules_prepare 2005 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2006 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2007ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2008 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2009endif 2010 $(Q)rm -f $(MODORDER) 2011 2012single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2013 2014KBUILD_MODULES := 1 2015 2016endif 2017 2018# Preset locale variables to speed up the build process. Limit locale 2019# tweaks to this spot to avoid wrong language settings when running 2020# make menuconfig etc. 2021# Error messages still appears in the original language 2022PHONY += $(build-dir) 2023$(build-dir): prepare 2024 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2025 2026clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2027PHONY += $(clean-dirs) clean 2028$(clean-dirs): 2029 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2030 2031clean: $(clean-dirs) 2032 $(call cmd,rmfiles) 2033 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2034 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2035 -o -name '*.ko.*' \ 2036 -o -name '*.dtb' -o -name '*.dtbo' \ 2037 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2038 -o -name '*.dt.yaml' \ 2039 -o -name '*.dwo' -o -name '*.lst' \ 2040 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2041 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2042 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2043 -o -name '*.asn1.[ch]' \ 2044 -o -name '*.symtypes' -o -name 'modules.order' \ 2045 -o -name '*.c.[012]*.*' \ 2046 -o -name '*.ll' \ 2047 -o -name '*.gcno' \ 2048 -o -name '*.*.symversions' \) -type f -print \ 2049 -o -name '.tmp_*' -print \ 2050 | xargs rm -rf 2051 2052# Generate tags for editors 2053# --------------------------------------------------------------------------- 2054quiet_cmd_tags = GEN $@ 2055 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2056 2057tags TAGS cscope gtags: FORCE 2058 $(call cmd,tags) 2059 2060# Script to generate missing namespace dependencies 2061# --------------------------------------------------------------------------- 2062 2063PHONY += nsdeps 2064nsdeps: export KBUILD_NSDEPS=1 2065nsdeps: modules 2066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2067 2068# Clang Tooling 2069# --------------------------------------------------------------------------- 2070 2071quiet_cmd_gen_compile_commands = GEN $@ 2072 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2073 2074$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2075 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2076 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2077 $(call if_changed,gen_compile_commands) 2078 2079targets += $(extmod_prefix)compile_commands.json 2080 2081PHONY += clang-tidy clang-analyzer 2082 2083ifdef CONFIG_CC_IS_CLANG 2084quiet_cmd_clang_tools = CHECK $< 2085 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2086 2087clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2088 $(call cmd,clang_tools) 2089else 2090clang-tidy clang-analyzer: 2091 @echo "$@ requires CC=clang" >&2 2092 @false 2093endif 2094 2095# Scripts to check various things for consistency 2096# --------------------------------------------------------------------------- 2097 2098PHONY += includecheck versioncheck coccicheck export_report 2099 2100includecheck: 2101 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2102 -name '*.[hcS]' -type f -print | sort \ 2103 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2104 2105versioncheck: 2106 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2107 -name '*.[hcS]' -type f -print | sort \ 2108 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2109 2110coccicheck: 2111 $(Q)$(BASH) $(srctree)/scripts/$@ 2112 2113export_report: 2114 $(PERL) $(srctree)/scripts/export_report.pl 2115 2116PHONY += checkstack kernelrelease kernelversion image_name 2117 2118# UML needs a little special treatment here. It wants to use the host 2119# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2120# else wants $(ARCH), including people doing cross-builds, which means 2121# that $(SUBARCH) doesn't work here. 2122ifeq ($(ARCH), um) 2123CHECKSTACK_ARCH := $(SUBARCH) 2124else 2125CHECKSTACK_ARCH := $(ARCH) 2126endif 2127checkstack: 2128 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2129 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2130 2131kernelrelease: 2132 @$(filechk_kernel.release) 2133 2134kernelversion: 2135 @echo $(KERNELVERSION) 2136 2137image_name: 2138 @echo $(KBUILD_IMAGE) 2139 2140quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2141 cmd_rmfiles = rm -rf $(rm-files) 2142 2143# read saved command lines for existing targets 2144existing-targets := $(wildcard $(sort $(targets))) 2145 2146-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2147 2148endif # config-build 2149endif # mixed-build 2150endif # need-sub-make 2151 2152PHONY += FORCE 2153FORCE: 2154 2155# Declare the contents of the PHONY variable as phony. We keep that 2156# information in a variable so we can use it in if_changed and friends. 2157.PHONY: $(PHONY) 2158