1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 4 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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$(error source directory cannot contain spaces or colons) 204endif 205 206ifneq ($(filter 3.%,$(MAKE_VERSION)),) 207# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 208# We need to invoke sub-make to avoid implicit rules in the top Makefile. 209need-sub-make := 1 210# Cancel implicit rules for this Makefile. 211$(this-makefile): ; 212endif 213 214export abs_srctree abs_objtree 215export sub_make_done := 1 216 217ifeq ($(need-sub-make),1) 218 219PHONY += $(MAKECMDGOALS) __sub-make 220 221$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 222 @: 223 224# Invoke a second make in the output directory, passing relevant variables 225__sub-make: 226 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 227 228endif # need-sub-make 229endif # sub_make_done 230 231# We process the rest of the Makefile if this is the final invocation of make 232ifeq ($(need-sub-make),) 233 234# Do not print "Entering directory ...", 235# but we want to display it when entering to the output directory 236# so that IDEs/editors are able to understand relative filenames. 237MAKEFLAGS += --no-print-directory 238 239ifeq ($(abs_srctree),$(abs_objtree)) 240 # building in the source tree 241 srctree := . 242 building_out_of_srctree := 243else 244 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 245 # building in a subdirectory of the source tree 246 srctree := .. 247 else 248 srctree := $(abs_srctree) 249 endif 250 building_out_of_srctree := 1 251endif 252 253ifneq ($(KBUILD_ABS_SRCTREE),) 254srctree := $(abs_srctree) 255endif 256 257objtree := . 258VPATH := $(srctree) 259 260export building_out_of_srctree srctree objtree VPATH 261 262# To make sure we do not include .config for any of the *config targets 263# catch them early, and hand them over to scripts/kconfig/Makefile 264# It is allowed to specify more targets when calling make, including 265# mixing *config targets and build targets. 266# For example 'make oldconfig all'. 267# Detect when mixed targets is specified, and make a second invocation 268# of make so .config is not included in this case either (for *config). 269 270version_h := include/generated/uapi/linux/version.h 271 272clean-targets := %clean mrproper cleandocs 273no-dot-config-targets := $(clean-targets) \ 274 cscope gtags TAGS tags help% %docs check% coccicheck \ 275 $(version_h) headers headers_% archheaders archscripts \ 276 %asm-generic kernelversion %src-pkg dt_binding_check \ 277 outputmakefile rustavailable rustfmt rustfmtcheck 278# Installation targets should not require compiler. Unfortunately, vdso_install 279# is an exception where build artifacts may be updated. This must be fixed. 280no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 281 headers_install modules_install kernelrelease image_name 282no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 283 image_name 284single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 285 286config-build := 287mixed-build := 288need-config := 1 289need-compiler := 1 290may-sync-config := 1 291single-build := 292 293ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 295 need-config := 296 endif 297endif 298 299ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 301 need-compiler := 302 endif 303endif 304 305ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 306 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 307 may-sync-config := 308 endif 309endif 310 311ifneq ($(KBUILD_EXTMOD),) 312 may-sync-config := 313endif 314 315ifeq ($(KBUILD_EXTMOD),) 316 ifneq ($(filter %config,$(MAKECMDGOALS)),) 317 config-build := 1 318 ifneq ($(words $(MAKECMDGOALS)),1) 319 mixed-build := 1 320 endif 321 endif 322endif 323 324# We cannot build single targets and the others at the same time 325ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 326 single-build := 1 327 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# For "make -j clean all", "make -j mrproper defconfig all", etc. 333ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 334 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339# install and modules_install need also be processed one by one 340ifneq ($(filter install,$(MAKECMDGOALS)),) 341 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 342 mixed-build := 1 343 endif 344endif 345 346ifdef mixed-build 347# =========================================================================== 348# We're called with mixed targets (*config and build targets). 349# Handle them one by one. 350 351PHONY += $(MAKECMDGOALS) __build_one_by_one 352 353$(MAKECMDGOALS): __build_one_by_one 354 @: 355 356__build_one_by_one: 357 $(Q)set -e; \ 358 for i in $(MAKECMDGOALS); do \ 359 $(MAKE) -f $(srctree)/Makefile $$i; \ 360 done 361 362else # !mixed-build 363 364include $(srctree)/scripts/Kbuild.include 365 366# Read KERNELRELEASE from include/config/kernel.release (if it exists) 367KERNELRELEASE = $(call read-file, include/config/kernel.release) 368KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 369export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 370 371include $(srctree)/scripts/subarch.include 372 373# Cross compiling and selecting different set of gcc/bin-utils 374# --------------------------------------------------------------------------- 375# 376# When performing cross compilation for other architectures ARCH shall be set 377# to the target architecture. (See arch/* for the possibilities). 378# ARCH can be set during invocation of make: 379# make ARCH=ia64 380# Another way is to have ARCH set in the environment. 381# The default ARCH is the host where make is executed. 382 383# CROSS_COMPILE specify the prefix used for all executables used 384# during compilation. Only gcc and related bin-utils executables 385# are prefixed with $(CROSS_COMPILE). 386# CROSS_COMPILE can be set on the command line 387# make CROSS_COMPILE=ia64-linux- 388# Alternatively CROSS_COMPILE can be set in the environment. 389# Default value for CROSS_COMPILE is not to prefix executables 390# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 391ARCH ?= $(SUBARCH) 392 393# Architecture as present in compile.h 394UTS_MACHINE := $(ARCH) 395SRCARCH := $(ARCH) 396 397# Additional ARCH settings for x86 398ifeq ($(ARCH),i386) 399 SRCARCH := x86 400endif 401ifeq ($(ARCH),x86_64) 402 SRCARCH := x86 403endif 404 405# Additional ARCH settings for sparc 406ifeq ($(ARCH),sparc32) 407 SRCARCH := sparc 408endif 409ifeq ($(ARCH),sparc64) 410 SRCARCH := sparc 411endif 412 413# Additional ARCH settings for parisc 414ifeq ($(ARCH),parisc64) 415 SRCARCH := parisc 416endif 417 418export cross_compiling := 419ifneq ($(SRCARCH),$(SUBARCH)) 420cross_compiling := 1 421endif 422 423KCONFIG_CONFIG ?= .config 424export KCONFIG_CONFIG 425 426# SHELL used by kbuild 427CONFIG_SHELL := sh 428 429HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 430HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 431HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 432 433ifneq ($(LLVM),) 434ifneq ($(filter %/,$(LLVM)),) 435LLVM_PREFIX := $(LLVM) 436else ifneq ($(filter -%,$(LLVM)),) 437LLVM_SUFFIX := $(LLVM) 438endif 439 440HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 441HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 442else 443HOSTCC = gcc 444HOSTCXX = g++ 445endif 446HOSTRUSTC = rustc 447HOSTPKG_CONFIG = pkg-config 448 449KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 450 -O2 -fomit-frame-pointer -std=gnu11 \ 451 -Wdeclaration-after-statement 452KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 453KBUILD_USERLDFLAGS := $(USERLDFLAGS) 454 455# These flags apply to all Rust code in the tree, including the kernel and 456# host programs. 457export rust_common_flags := --edition=2021 \ 458 -Zbinary_dep_depinfo=y \ 459 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 460 -Dunreachable_pub -Dnon_ascii_idents \ 461 -Wmissing_docs \ 462 -Drustdoc::missing_crate_level_docs \ 463 -Dclippy::correctness -Dclippy::style \ 464 -Dclippy::suspicious -Dclippy::complexity \ 465 -Dclippy::perf \ 466 -Dclippy::let_unit_value -Dclippy::mut_mut \ 467 -Dclippy::needless_bitwise_bool \ 468 -Dclippy::needless_continue \ 469 -Wclippy::dbg_macro 470 471KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 472KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 473KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 474 -Zallow-features= $(HOSTRUSTFLAGS) 475KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 476KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 477 478# Make variables (CC, etc...) 479CPP = $(CC) -E 480ifneq ($(LLVM),) 481CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 482LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 483AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 484NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 485OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 486OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 487READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 488STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 489else 490CC = $(CROSS_COMPILE)gcc 491LD = $(CROSS_COMPILE)ld 492AR = $(CROSS_COMPILE)ar 493NM = $(CROSS_COMPILE)nm 494OBJCOPY = $(CROSS_COMPILE)objcopy 495OBJDUMP = $(CROSS_COMPILE)objdump 496READELF = $(CROSS_COMPILE)readelf 497STRIP = $(CROSS_COMPILE)strip 498endif 499RUSTC = rustc 500RUSTDOC = rustdoc 501RUSTFMT = rustfmt 502CLIPPY_DRIVER = clippy-driver 503BINDGEN = bindgen 504CARGO = cargo 505PAHOLE = pahole 506RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 507LEX = flex 508YACC = bison 509AWK = awk 510INSTALLKERNEL := installkernel 511DEPMOD = depmod 512PERL = perl 513PYTHON3 = python3 514CHECK = sparse 515BASH = bash 516KGZIP = gzip 517KBZIP2 = bzip2 518KLZOP = lzop 519LZMA = lzma 520LZ4 = lz4c 521XZ = xz 522ZSTD = zstd 523 524PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 525 526CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 527 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 528NOSTDINC_FLAGS := 529CFLAGS_MODULE = 530RUSTFLAGS_MODULE = 531AFLAGS_MODULE = 532LDFLAGS_MODULE = 533CFLAGS_KERNEL = 534RUSTFLAGS_KERNEL = 535AFLAGS_KERNEL = 536LDFLAGS_vmlinux = 537 538# Use USERINCLUDE when you must reference the UAPI directories only. 539USERINCLUDE := \ 540 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 541 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 542 -I$(srctree)/include/uapi \ 543 -I$(objtree)/include/generated/uapi \ 544 -include $(srctree)/include/linux/compiler-version.h \ 545 -include $(srctree)/include/linux/kconfig.h 546 547# Use LINUXINCLUDE when you must reference the include/ directory. 548# Needed to be compatible with the O= option 549LINUXINCLUDE := \ 550 -I$(srctree)/arch/$(SRCARCH)/include \ 551 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 552 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 553 -I$(objtree)/include \ 554 $(USERINCLUDE) 555 556KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 557KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 558 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 559 -Werror=implicit-function-declaration -Werror=implicit-int \ 560 -Werror=return-type -Wno-format-security -funsigned-char \ 561 -std=gnu11 562KBUILD_CPPFLAGS := -D__KERNEL__ 563KBUILD_RUSTFLAGS := $(rust_common_flags) \ 564 --target=$(objtree)/scripts/target.json \ 565 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 566 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 567 -Csymbol-mangling-version=v0 \ 568 -Crelocation-model=static \ 569 -Zfunction-sections=n \ 570 -Dclippy::float_arithmetic 571 572KBUILD_AFLAGS_KERNEL := 573KBUILD_CFLAGS_KERNEL := 574KBUILD_RUSTFLAGS_KERNEL := 575KBUILD_AFLAGS_MODULE := -DMODULE 576KBUILD_CFLAGS_MODULE := -DMODULE 577KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 578KBUILD_LDFLAGS_MODULE := 579KBUILD_LDFLAGS := 580CLANG_FLAGS := 581 582ifeq ($(KBUILD_CLIPPY),1) 583 RUSTC_OR_CLIPPY_QUIET := CLIPPY 584 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 585else 586 RUSTC_OR_CLIPPY_QUIET := RUSTC 587 RUSTC_OR_CLIPPY = $(RUSTC) 588endif 589 590ifdef RUST_LIB_SRC 591 export RUST_LIB_SRC 592endif 593 594# Allows the usage of unstable features in stable compilers. 595export RUSTC_BOOTSTRAP := 1 596 597export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 598export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 599export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 600export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 601export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 602export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 603export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 604export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 605 606export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 607export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 608export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 609export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 610export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 611export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 612export PAHOLE_FLAGS 613 614# Files to ignore in find ... statements 615 616export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 617 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 618 -prune -o 619export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 620 --exclude CVS --exclude .pc --exclude .hg --exclude .git 621 622# =========================================================================== 623# Rules shared between *config targets and build targets 624 625# Basic helpers built in scripts/basic/ 626PHONY += scripts_basic 627scripts_basic: 628 $(Q)$(MAKE) $(build)=scripts/basic 629 630PHONY += outputmakefile 631ifdef building_out_of_srctree 632# Before starting out-of-tree build, make sure the source tree is clean. 633# outputmakefile generates a Makefile in the output directory, if using a 634# separate output directory. This allows convenient use of make in the 635# output directory. 636# At the same time when output Makefile generated, generate .gitignore to 637# ignore whole output directory 638 639quiet_cmd_makefile = GEN Makefile 640 cmd_makefile = { \ 641 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 642 echo "include $(srctree)/Makefile"; \ 643 } > Makefile 644 645outputmakefile: 646 @if [ -f $(srctree)/.config -o \ 647 -d $(srctree)/include/config -o \ 648 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 649 echo >&2 "***"; \ 650 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 651 echo >&2 "*** in $(abs_srctree)";\ 652 echo >&2 "***"; \ 653 false; \ 654 fi 655 $(Q)ln -fsn $(srctree) source 656 $(call cmd,makefile) 657 $(Q)test -e .gitignore || \ 658 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 659endif 660 661# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 662# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 663# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 664# and from include/config/auto.conf.cmd to detect the compiler upgrade. 665CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 666 667ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 668include $(srctree)/scripts/Makefile.clang 669endif 670 671# Include this also for config targets because some architectures need 672# cc-cross-prefix to determine CROSS_COMPILE. 673ifdef need-compiler 674include $(srctree)/scripts/Makefile.compiler 675endif 676 677ifdef config-build 678# =========================================================================== 679# *config targets only - make sure prerequisites are updated, and descend 680# in scripts/kconfig to make the *config target 681 682# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 683# KBUILD_DEFCONFIG may point out an alternative default configuration 684# used for 'make defconfig' 685include $(srctree)/arch/$(SRCARCH)/Makefile 686export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 687 688config: outputmakefile scripts_basic FORCE 689 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 690 691%config: outputmakefile scripts_basic FORCE 692 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 693 694else #!config-build 695# =========================================================================== 696# Build targets only - this includes vmlinux, arch specific targets, clean 697# targets and others. In general all targets except *config targets. 698 699# If building an external module we do not care about the all: rule 700# but instead __all depend on modules 701PHONY += all 702ifeq ($(KBUILD_EXTMOD),) 703__all: all 704else 705__all: modules 706endif 707 708targets := 709 710# Decide whether to build built-in, modular, or both. 711# Normally, just do built-in. 712 713KBUILD_MODULES := 714KBUILD_BUILTIN := 1 715 716# If we have only "make modules", don't compile built-in objects. 717ifeq ($(MAKECMDGOALS),modules) 718 KBUILD_BUILTIN := 719endif 720 721# If we have "make <whatever> modules", compile modules 722# in addition to whatever we do anyway. 723# Just "make" or "make all" shall build modules as well 724 725ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 726 KBUILD_MODULES := 1 727endif 728 729ifeq ($(MAKECMDGOALS),) 730 KBUILD_MODULES := 1 731endif 732 733export KBUILD_MODULES KBUILD_BUILTIN 734 735ifdef need-config 736include include/config/auto.conf 737endif 738 739ifeq ($(KBUILD_EXTMOD),) 740# Objects we will link into vmlinux / subdirs we need to visit 741core-y := 742drivers-y := 743libs-y := lib/ 744endif # KBUILD_EXTMOD 745 746# The all: target is the default when no target is given on the 747# command line. 748# This allow a user to issue only 'make' to build a kernel including modules 749# Defaults to vmlinux, but the arch makefile usually adds further targets 750all: vmlinux 751 752CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 753ifdef CONFIG_CC_IS_GCC 754CFLAGS_GCOV += -fno-tree-loop-im 755endif 756export CFLAGS_GCOV 757 758# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 759ifdef CONFIG_FUNCTION_TRACER 760 CC_FLAGS_FTRACE := -pg 761endif 762 763include $(srctree)/arch/$(SRCARCH)/Makefile 764 765ifdef need-config 766ifdef may-sync-config 767# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 768# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 769# because some architectures define CROSS_COMPILE there. 770include include/config/auto.conf.cmd 771 772$(KCONFIG_CONFIG): 773 @echo >&2 '***' 774 @echo >&2 '*** Configuration file "$@" not found!' 775 @echo >&2 '***' 776 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 777 @echo >&2 '*** "make menuconfig" or "make xconfig").' 778 @echo >&2 '***' 779 @/bin/false 780 781# The actual configuration files used during the build are stored in 782# include/generated/ and include/config/. Update them if .config is newer than 783# include/config/auto.conf (which mirrors .config). 784# 785# This exploits the 'multi-target pattern rule' trick. 786# The syncconfig should be executed only once to make all the targets. 787# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 788# 789# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 790# so you cannot notice that Kconfig is waiting for the user input. 791%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 792 $(Q)$(kecho) " SYNC $@" 793 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 794else # !may-sync-config 795# External modules and some install targets need include/generated/autoconf.h 796# and include/config/auto.conf but do not care if they are up-to-date. 797# Use auto.conf to trigger the test 798PHONY += include/config/auto.conf 799 800include/config/auto.conf: 801 @test -e include/generated/autoconf.h -a -e $@ || ( \ 802 echo >&2; \ 803 echo >&2 " ERROR: Kernel configuration is invalid."; \ 804 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 805 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 806 echo >&2 ; \ 807 /bin/false) 808 809endif # may-sync-config 810endif # need-config 811 812KBUILD_CFLAGS += -fno-delete-null-pointer-checks 813KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 814KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 815KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 816KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 817 818ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 819KBUILD_CFLAGS += -O2 820KBUILD_RUSTFLAGS += -Copt-level=2 821else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 822KBUILD_CFLAGS += -Os 823KBUILD_RUSTFLAGS += -Copt-level=s 824endif 825 826# Always set `debug-assertions` and `overflow-checks` because their default 827# depends on `opt-level` and `debug-assertions`, respectively. 828KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 829KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 830 831# Tell gcc to never replace conditional load with a non-conditional one 832ifdef CONFIG_CC_IS_GCC 833# gcc-10 renamed --param=allow-store-data-races=0 to 834# -fno-allow-store-data-races. 835KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 836KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 837endif 838 839ifdef CONFIG_READABLE_ASM 840# Disable optimizations that make assembler listings hard to read. 841# reorder blocks reorders the control in the function 842# ipa clone creates specialized cloned functions 843# partial inlining inlines only parts of functions 844KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 845endif 846 847ifneq ($(CONFIG_FRAME_WARN),0) 848KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 849endif 850 851stackp-flags-y := -fno-stack-protector 852stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 853stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 854 855KBUILD_CFLAGS += $(stackp-flags-y) 856 857KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 858KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 859KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 860 861KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 862KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 863 864ifdef CONFIG_CC_IS_CLANG 865# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 866KBUILD_CFLAGS += -Wno-gnu 867else 868 869# gcc inanely warns about local variables called 'main' 870KBUILD_CFLAGS += -Wno-main 871endif 872 873# These warnings generated too much noise in a regular build. 874# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 875KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 876KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 877 878# These result in bogus false positives 879KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 880 881ifdef CONFIG_FRAME_POINTER 882KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 883KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 884else 885# Some targets (ARM with Thumb2, for example), can't be built with frame 886# pointers. For those, we don't have FUNCTION_TRACER automatically 887# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 888# incompatible with -fomit-frame-pointer with current GCC, so we don't use 889# -fomit-frame-pointer with FUNCTION_TRACER. 890# In the Rust target specification, "frame-pointer" is set explicitly 891# to "may-omit". 892ifndef CONFIG_FUNCTION_TRACER 893KBUILD_CFLAGS += -fomit-frame-pointer 894endif 895endif 896 897# Initialize all stack variables with a 0xAA pattern. 898ifdef CONFIG_INIT_STACK_ALL_PATTERN 899KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 900endif 901 902# Initialize all stack variables with a zero value. 903ifdef CONFIG_INIT_STACK_ALL_ZERO 904KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 905ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 906# https://github.com/llvm/llvm-project/issues/44842 907CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 908export CC_AUTO_VAR_INIT_ZERO_ENABLER 909KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 910endif 911endif 912 913# While VLAs have been removed, GCC produces unreachable stack probes 914# for the randomize_kstack_offset feature. Disable it for all compilers. 915KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 916 917# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 918ifdef CONFIG_ZERO_CALL_USED_REGS 919KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 920endif 921 922ifdef CONFIG_FUNCTION_TRACER 923ifdef CONFIG_FTRACE_MCOUNT_USE_CC 924 CC_FLAGS_FTRACE += -mrecord-mcount 925 ifdef CONFIG_HAVE_NOP_MCOUNT 926 ifeq ($(call cc-option-yn, -mnop-mcount),y) 927 CC_FLAGS_FTRACE += -mnop-mcount 928 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 929 endif 930 endif 931endif 932ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 933 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 934 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 935 endif 936endif 937ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 938 ifdef CONFIG_HAVE_C_RECORDMCOUNT 939 BUILD_C_RECORDMCOUNT := y 940 export BUILD_C_RECORDMCOUNT 941 endif 942endif 943ifdef CONFIG_HAVE_FENTRY 944 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 945 ifeq ($(call cc-option-yn, -mfentry),y) 946 CC_FLAGS_FTRACE += -mfentry 947 CC_FLAGS_USING += -DCC_USING_FENTRY 948 endif 949endif 950export CC_FLAGS_FTRACE 951KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 952KBUILD_AFLAGS += $(CC_FLAGS_USING) 953endif 954 955# We trigger additional mismatches with less inlining 956ifdef CONFIG_DEBUG_SECTION_MISMATCH 957KBUILD_CFLAGS += -fno-inline-functions-called-once 958endif 959 960# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 961ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 962KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 963KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 964LDFLAGS_vmlinux += --gc-sections 965endif 966 967ifdef CONFIG_SHADOW_CALL_STACK 968ifndef CONFIG_DYNAMIC_SCS 969CC_FLAGS_SCS := -fsanitize=shadow-call-stack 970KBUILD_CFLAGS += $(CC_FLAGS_SCS) 971endif 972export CC_FLAGS_SCS 973endif 974 975ifdef CONFIG_LTO_CLANG 976ifdef CONFIG_LTO_CLANG_THIN 977CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 978KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 979else 980CC_FLAGS_LTO := -flto 981endif 982CC_FLAGS_LTO += -fvisibility=hidden 983 984# Limit inlining across translation units to reduce binary size 985KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 986 987# Check for frame size exceeding threshold during prolog/epilog insertion 988# when using lld < 13.0.0. 989ifneq ($(CONFIG_FRAME_WARN),0) 990ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 991KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 992endif 993endif 994endif 995 996ifdef CONFIG_LTO 997KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 998KBUILD_AFLAGS += -fno-lto 999export CC_FLAGS_LTO 1000endif 1001 1002ifdef CONFIG_CFI_CLANG 1003CC_FLAGS_CFI := -fsanitize=kcfi 1004KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1005export CC_FLAGS_CFI 1006endif 1007 1008ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1009KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1010endif 1011 1012# arch Makefile may override CC so keep this after arch Makefile is included 1013NOSTDINC_FLAGS += -nostdinc 1014 1015# warn about C99 declaration after statement 1016KBUILD_CFLAGS += -Wdeclaration-after-statement 1017 1018# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1019KBUILD_CFLAGS += -Wvla 1020 1021# disable pointer signed / unsigned warnings in gcc 4.0 1022KBUILD_CFLAGS += -Wno-pointer-sign 1023 1024# In order to make sure new function cast mismatches are not introduced 1025# in the kernel (to avoid tripping CFI checking), the kernel should be 1026# globally built with -Wcast-function-type. 1027KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1028 1029# disable stringop warnings in gcc 8+ 1030KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1031 1032# We'll want to enable this eventually, but it's not going away for 5.7 at least 1033KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1034 1035# Another good warning that we'll want to enable eventually 1036KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1037 1038# Enabled with W=2, disabled by default as noisy 1039ifdef CONFIG_CC_IS_GCC 1040KBUILD_CFLAGS += -Wno-maybe-uninitialized 1041endif 1042 1043# The allocators already balk at large sizes, so silence the compiler 1044# warnings for bounds checks involving those possible values. While 1045# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1046# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1047# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1048# doesn't work (as it is documented to), silently resolving to "0" prior to 1049# version 9.1 (and producing an error more recently). Numeric values larger 1050# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1051# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1052# choice, we must perform a versioned check to disable this warning. 1053# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1054KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1055KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1056 1057# disable invalid "can't wrap" optimizations for signed / pointers 1058KBUILD_CFLAGS += -fno-strict-overflow 1059 1060# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1061KBUILD_CFLAGS += -fno-stack-check 1062 1063# conserve stack if available 1064ifdef CONFIG_CC_IS_GCC 1065KBUILD_CFLAGS += -fconserve-stack 1066endif 1067 1068# Prohibit date/time macros, which would make the build non-deterministic 1069KBUILD_CFLAGS += -Werror=date-time 1070 1071# enforce correct pointer usage 1072KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1073 1074# Require designated initializers for all marked structures 1075KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1076 1077# change __FILE__ to the relative path from the srctree 1078KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1079 1080# include additional Makefiles when needed 1081include-y := scripts/Makefile.extrawarn 1082include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1083include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1084include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1085include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1086include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1087include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1088include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1089include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1090 1091include $(addprefix $(srctree)/, $(include-y)) 1092 1093# scripts/Makefile.gcc-plugins is intentionally included last. 1094# Do not add $(call cc-option,...) below this line. When you build the kernel 1095# from the clean source tree, the GCC plugins do not exist at this point. 1096 1097# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1098KBUILD_CPPFLAGS += $(KCPPFLAGS) 1099KBUILD_AFLAGS += $(KAFLAGS) 1100KBUILD_CFLAGS += $(KCFLAGS) 1101KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1102 1103KBUILD_LDFLAGS_MODULE += --build-id=sha1 1104LDFLAGS_vmlinux += --build-id=sha1 1105 1106KBUILD_LDFLAGS += -z noexecstack 1107ifeq ($(CONFIG_LD_IS_BFD),y) 1108KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1109endif 1110 1111ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1112LDFLAGS_vmlinux += -X 1113endif 1114 1115ifeq ($(CONFIG_RELR),y) 1116# ld.lld before 15 did not support -z pack-relative-relocs. 1117LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1118endif 1119 1120# We never want expected sections to be placed heuristically by the 1121# linker. All sections should be explicitly named in the linker script. 1122ifdef CONFIG_LD_ORPHAN_WARN 1123LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1124endif 1125 1126# Align the bit size of userspace programs with the kernel 1127KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1128KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1129 1130# make the checker run with the right architecture 1131CHECKFLAGS += --arch=$(ARCH) 1132 1133# insure the checker run with the right endianness 1134CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1135 1136# the checker needs the correct machine size 1137CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1138 1139# Default kernel image to build when no specific target is given. 1140# KBUILD_IMAGE may be overruled on the command line or 1141# set in the environment 1142# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1143# this default value 1144export KBUILD_IMAGE ?= vmlinux 1145 1146# 1147# INSTALL_PATH specifies where to place the updated kernel and system map 1148# images. Default is /boot, but you can set it to other values 1149export INSTALL_PATH ?= /boot 1150 1151# 1152# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1153# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1154# an argument if needed. Otherwise it defaults to the kernel install path 1155# 1156export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1157 1158# 1159# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1160# relocations required by build roots. This is not defined in the 1161# makefile but the argument can be passed to make if needed. 1162# 1163 1164MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1165export MODLIB 1166 1167PHONY += prepare0 1168 1169export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1170export MODORDER := $(extmod_prefix)modules.order 1171export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1172 1173ifeq ($(KBUILD_EXTMOD),) 1174 1175build-dir := . 1176clean-dirs := $(sort . Documentation \ 1177 $(patsubst %/,%,$(filter %/, $(core-) \ 1178 $(drivers-) $(libs-)))) 1179 1180export ARCH_CORE := $(core-y) 1181export ARCH_LIB := $(filter %/, $(libs-y)) 1182export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1183# Externally visible symbols (used by link-vmlinux.sh) 1184 1185KBUILD_VMLINUX_OBJS := ./built-in.a 1186ifdef CONFIG_MODULES 1187KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1188KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1189else 1190KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1191endif 1192 1193export KBUILD_VMLINUX_LIBS 1194export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1195 1196# Recurse until adjust_autoksyms.sh is satisfied 1197PHONY += autoksyms_recursive 1198ifdef CONFIG_TRIM_UNUSED_KSYMS 1199# For the kernel to actually contain only the needed exported symbols, 1200# we have to build modules as well to determine what those symbols are. 1201# (this can be evaluated only once include/config/auto.conf has been included) 1202KBUILD_MODULES := 1 1203 1204autoksyms_recursive: $(build-dir) modules.order 1205 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1206 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1207endif 1208 1209autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1210 1211quiet_cmd_autoksyms_h = GEN $@ 1212 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1213 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1214 1215$(autoksyms_h): 1216 $(call cmd,autoksyms_h) 1217 1218# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1219quiet_cmd_ar_vmlinux.a = AR $@ 1220 cmd_ar_vmlinux.a = \ 1221 rm -f $@; \ 1222 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1223 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1224 1225targets += vmlinux.a 1226vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1227 $(call if_changed,ar_vmlinux.a) 1228 1229PHONY += vmlinux_o 1230vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1231 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1232 1233vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1234 @: 1235 1236PHONY += vmlinux 1237# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1238# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1239# unrelated; the decompressors just happen to have the same base name, 1240# arch/*/boot/compressed/vmlinux. 1241# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1242# 1243# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1244# https://savannah.gnu.org/bugs/?61463 1245# For Make > 4.4, the following simple code will work: 1246# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1247vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1248vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1249vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1250 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1251 1252# The actual objects are generated when descending, 1253# make sure no implicit rule kicks in 1254$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1255 1256ifeq ($(origin KERNELRELEASE),file) 1257filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1258else 1259filechk_kernel.release = echo $(KERNELRELEASE) 1260endif 1261 1262# Store (new) KERNELRELEASE string in include/config/kernel.release 1263include/config/kernel.release: FORCE 1264 $(call filechk,kernel.release) 1265 1266# Additional helpers built in scripts/ 1267# Carefully list dependencies so we do not try to build scripts twice 1268# in parallel 1269PHONY += scripts 1270scripts: scripts_basic scripts_dtc 1271 $(Q)$(MAKE) $(build)=$(@) 1272 1273# Things we need to do before we recursively start building the kernel 1274# or the modules are listed in "prepare". 1275# A multi level approach is used. prepareN is processed before prepareN-1. 1276# archprepare is used in arch Makefiles and when processed asm symlink, 1277# version.h and scripts_basic is processed / created. 1278 1279PHONY += prepare archprepare 1280 1281archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1282 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1283 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1284 1285prepare0: archprepare 1286 $(Q)$(MAKE) $(build)=scripts/mod 1287 $(Q)$(MAKE) $(build)=. prepare 1288 1289# All the preparing.. 1290prepare: prepare0 1291ifdef CONFIG_RUST 1292 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1293 $(Q)$(MAKE) $(build)=rust 1294endif 1295 1296PHONY += remove-stale-files 1297remove-stale-files: 1298 $(Q)$(srctree)/scripts/remove-stale-files 1299 1300# Support for using generic headers in asm-generic 1301asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1302 1303PHONY += asm-generic uapi-asm-generic 1304asm-generic: uapi-asm-generic 1305 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1306 generic=include/asm-generic 1307uapi-asm-generic: 1308 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1309 generic=include/uapi/asm-generic 1310 1311# Generate some files 1312# --------------------------------------------------------------------------- 1313 1314# KERNELRELEASE can change from a few different places, meaning version.h 1315# needs to be updated, so this check is forced on all builds 1316 1317uts_len := 64 1318define filechk_utsrelease.h 1319 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1320 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1321 exit 1; \ 1322 fi; \ 1323 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1324endef 1325 1326define filechk_version.h 1327 if [ $(SUBLEVEL) -gt 255 ]; then \ 1328 echo \#define LINUX_VERSION_CODE $(shell \ 1329 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1330 else \ 1331 echo \#define LINUX_VERSION_CODE $(shell \ 1332 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1333 fi; \ 1334 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1335 ((c) > 255 ? 255 : (c)))'; \ 1336 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1337 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1338 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1339endef 1340 1341$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1342$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1343$(version_h): FORCE 1344 $(call filechk,version.h) 1345 1346include/generated/utsrelease.h: include/config/kernel.release FORCE 1347 $(call filechk,utsrelease.h) 1348 1349filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1350 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1351 1352include/generated/compile.h: FORCE 1353 $(call filechk,compile.h) 1354 1355PHONY += headerdep 1356headerdep: 1357 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1358 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1359 1360# --------------------------------------------------------------------------- 1361# Kernel headers 1362 1363#Default location for installed headers 1364export INSTALL_HDR_PATH = $(objtree)/usr 1365 1366quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1367 cmd_headers_install = \ 1368 mkdir -p $(INSTALL_HDR_PATH); \ 1369 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1370 usr/include $(INSTALL_HDR_PATH) 1371 1372PHONY += headers_install 1373headers_install: headers 1374 $(call cmd,headers_install) 1375 1376PHONY += archheaders archscripts 1377 1378hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1379 1380PHONY += headers 1381headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1382 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1383 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1384 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1385 1386ifdef CONFIG_HEADERS_INSTALL 1387prepare: headers 1388endif 1389 1390PHONY += scripts_unifdef 1391scripts_unifdef: scripts_basic 1392 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1393 1394# --------------------------------------------------------------------------- 1395# Install 1396 1397# Many distributions have the custom install script, /sbin/installkernel. 1398# If DKMS is installed, 'make install' will eventually recurse back 1399# to this Makefile to build and install external modules. 1400# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1401 1402quiet_cmd_install = INSTALL $(INSTALL_PATH) 1403 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1404 1405# --------------------------------------------------------------------------- 1406# Tools 1407 1408ifdef CONFIG_OBJTOOL 1409prepare: tools/objtool 1410endif 1411 1412ifdef CONFIG_BPF 1413ifdef CONFIG_DEBUG_INFO_BTF 1414prepare: tools/bpf/resolve_btfids 1415endif 1416endif 1417 1418PHONY += resolve_btfids_clean 1419 1420resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1421 1422# tools/bpf/resolve_btfids directory might not exist 1423# in output directory, skip its clean in that case 1424resolve_btfids_clean: 1425ifneq ($(wildcard $(resolve_btfids_O)),) 1426 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1427endif 1428 1429# Clear a bunch of variables before executing the submake 1430ifeq ($(quiet),silent_) 1431tools_silent=s 1432endif 1433 1434tools/: FORCE 1435 $(Q)mkdir -p $(objtree)/tools 1436 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1437 1438tools/%: FORCE 1439 $(Q)mkdir -p $(objtree)/tools 1440 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1441 1442# --------------------------------------------------------------------------- 1443# Kernel selftest 1444 1445PHONY += kselftest 1446kselftest: headers 1447 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1448 1449kselftest-%: headers FORCE 1450 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1451 1452PHONY += kselftest-merge 1453kselftest-merge: 1454 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1455 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1456 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1457 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1458 1459# --------------------------------------------------------------------------- 1460# Devicetree files 1461 1462ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1463dtstree := arch/$(SRCARCH)/boot/dts 1464endif 1465 1466ifneq ($(dtstree),) 1467 1468%.dtb: dtbs_prepare 1469 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1470 1471%.dtbo: dtbs_prepare 1472 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1473 1474PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1475dtbs: dtbs_prepare 1476 $(Q)$(MAKE) $(build)=$(dtstree) 1477 1478# include/config/kernel.release is actually needed when installing DTBs because 1479# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1480# dtbs_install depend on it as dtbs_install may run as root. 1481dtbs_prepare: include/config/kernel.release scripts_dtc 1482 1483ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1484export CHECK_DTBS=y 1485endif 1486 1487ifneq ($(CHECK_DTBS),) 1488dtbs_prepare: dt_binding_check 1489endif 1490 1491dtbs_check: dtbs 1492 1493dtbs_install: 1494 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1495 1496ifdef CONFIG_OF_EARLY_FLATTREE 1497all: dtbs 1498endif 1499 1500endif 1501 1502PHONY += scripts_dtc 1503scripts_dtc: scripts_basic 1504 $(Q)$(MAKE) $(build)=scripts/dtc 1505 1506ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1507export CHECK_DT_BINDING=y 1508endif 1509 1510PHONY += dt_binding_check 1511dt_binding_check: scripts_dtc 1512 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1513 1514PHONY += dt_compatible_check 1515dt_compatible_check: dt_binding_check 1516 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1517 1518# --------------------------------------------------------------------------- 1519# Modules 1520 1521ifdef CONFIG_MODULES 1522 1523# By default, build modules as well 1524 1525all: modules 1526 1527# When we're building modules with modversions, we need to consider 1528# the built-in objects during the descend as well, in order to 1529# make sure the checksums are up to date before we record them. 1530ifdef CONFIG_MODVERSIONS 1531 KBUILD_BUILTIN := 1 1532endif 1533 1534# Build modules 1535# 1536 1537# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1538# is an exception. 1539ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1540KBUILD_BUILTIN := 1 1541modules: vmlinux 1542endif 1543 1544modules: modules_prepare 1545 1546# Target to prepare building external modules 1547modules_prepare: prepare 1548 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1549 1550export modules_sign_only := 1551 1552ifeq ($(CONFIG_MODULE_SIG),y) 1553PHONY += modules_sign 1554modules_sign: modules_install 1555 @: 1556 1557# modules_sign is a subset of modules_install. 1558# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1559ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1560modules_sign_only := y 1561endif 1562endif 1563 1564modinst_pre := 1565ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1566modinst_pre := __modinst_pre 1567endif 1568 1569modules_install: $(modinst_pre) 1570PHONY += __modinst_pre 1571__modinst_pre: 1572 @rm -rf $(MODLIB)/kernel 1573 @rm -f $(MODLIB)/source 1574 @mkdir -p $(MODLIB)/kernel 1575 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1576 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1577 rm -f $(MODLIB)/build ; \ 1578 ln -s $(CURDIR) $(MODLIB)/build ; \ 1579 fi 1580 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1581 @cp -f modules.builtin $(MODLIB)/ 1582 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1583 1584endif # CONFIG_MODULES 1585 1586### 1587# Cleaning is done on three levels. 1588# make clean Delete most generated files 1589# Leave enough to build external modules 1590# make mrproper Delete the current configuration, and all generated files 1591# make distclean Remove editor backup files, patch leftover files and the like 1592 1593# Directories & files removed with 'make clean' 1594CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1595 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1596 compile_commands.json .thinlto-cache rust/test rust/doc \ 1597 rust-project.json .vmlinux.objs .vmlinux.export.c 1598 1599# Directories & files removed with 'make mrproper' 1600MRPROPER_FILES += include/config include/generated \ 1601 arch/$(SRCARCH)/include/generated .objdiff \ 1602 debian snap tar-install \ 1603 .config .config.old .version \ 1604 Module.symvers \ 1605 certs/signing_key.pem \ 1606 certs/x509.genkey \ 1607 vmlinux-gdb.py \ 1608 *.spec rpmbuild \ 1609 rust/libmacros.so 1610 1611# clean - Delete most, but leave enough to build external modules 1612# 1613clean: rm-files := $(CLEAN_FILES) 1614 1615PHONY += archclean vmlinuxclean 1616 1617vmlinuxclean: 1618 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1619 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1620 1621clean: archclean vmlinuxclean resolve_btfids_clean 1622 1623# mrproper - Delete all generated files, including .config 1624# 1625mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1626mrproper-dirs := $(addprefix _mrproper_,scripts) 1627 1628PHONY += $(mrproper-dirs) mrproper 1629$(mrproper-dirs): 1630 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1631 1632mrproper: clean $(mrproper-dirs) 1633 $(call cmd,rmfiles) 1634 @find . $(RCS_FIND_IGNORE) \ 1635 \( -name '*.rmeta' \) \ 1636 -type f -print | xargs rm -f 1637 1638# distclean 1639# 1640PHONY += distclean 1641 1642distclean: mrproper 1643 @find . $(RCS_FIND_IGNORE) \ 1644 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1645 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1646 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1647 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1648 -type f -print | xargs rm -f 1649 1650 1651# Packaging of the kernel to various formats 1652# --------------------------------------------------------------------------- 1653 1654%src-pkg: FORCE 1655 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1656%pkg: include/config/kernel.release FORCE 1657 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1658 1659# Brief documentation of the typical targets used 1660# --------------------------------------------------------------------------- 1661 1662boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1663boards := $(sort $(notdir $(boards))) 1664board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1665board-dirs := $(sort $(notdir $(board-dirs:/=))) 1666 1667PHONY += help 1668help: 1669 @echo 'Cleaning targets:' 1670 @echo ' clean - Remove most generated files but keep the config and' 1671 @echo ' enough build support to build external modules' 1672 @echo ' mrproper - Remove all generated files + config + various backup files' 1673 @echo ' distclean - mrproper + remove editor backup and patch files' 1674 @echo '' 1675 @echo 'Configuration targets:' 1676 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1677 @echo '' 1678 @echo 'Other generic targets:' 1679 @echo ' all - Build all targets marked with [*]' 1680 @echo '* vmlinux - Build the bare kernel' 1681 @echo '* modules - Build all modules' 1682 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1683 @echo ' dir/ - Build all files in dir and below' 1684 @echo ' dir/file.[ois] - Build specified target only' 1685 @echo ' dir/file.ll - Build the LLVM assembly file' 1686 @echo ' (requires compiler support for LLVM assembly generation)' 1687 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1688 @echo ' (requires a recent binutils and recent build (System.map))' 1689 @echo ' dir/file.ko - Build module including final link' 1690 @echo ' modules_prepare - Set up for building external modules' 1691 @echo ' tags/TAGS - Generate tags file for editors' 1692 @echo ' cscope - Generate cscope index' 1693 @echo ' gtags - Generate GNU GLOBAL index' 1694 @echo ' kernelrelease - Output the release version string (use with make -s)' 1695 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1696 @echo ' image_name - Output the image name (use with make -s)' 1697 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1698 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1699 echo '' 1700 @echo 'Static analysers:' 1701 @echo ' checkstack - Generate a list of stack hogs' 1702 @echo ' versioncheck - Sanity check on version.h usage' 1703 @echo ' includecheck - Check for duplicate included header files' 1704 @echo ' export_report - List the usages of all exported symbols' 1705 @echo ' headerdep - Detect inclusion cycles in headers' 1706 @echo ' coccicheck - Check with Coccinelle' 1707 @echo ' clang-analyzer - Check with clang static analyzer' 1708 @echo ' clang-tidy - Check with clang-tidy' 1709 @echo '' 1710 @echo 'Tools:' 1711 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1712 @echo '' 1713 @echo 'Kernel selftest:' 1714 @echo ' kselftest - Build and run kernel selftest' 1715 @echo ' Build, install, and boot kernel before' 1716 @echo ' running kselftest on it' 1717 @echo ' Run as root for full coverage' 1718 @echo ' kselftest-all - Build kernel selftest' 1719 @echo ' kselftest-install - Build and install kernel selftest' 1720 @echo ' kselftest-clean - Remove all generated kselftest files' 1721 @echo ' kselftest-merge - Merge all the config dependencies of' 1722 @echo ' kselftest to existing .config.' 1723 @echo '' 1724 @echo 'Rust targets:' 1725 @echo ' rustavailable - Checks whether the Rust toolchain is' 1726 @echo ' available and, if not, explains why.' 1727 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1728 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1729 @echo ' is formatted, printing a diff otherwise.' 1730 @echo ' rustdoc - Generate Rust documentation' 1731 @echo ' (requires kernel .config)' 1732 @echo ' rusttest - Runs the Rust tests' 1733 @echo ' (requires kernel .config; downloads external repos)' 1734 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1735 @echo ' (requires kernel .config)' 1736 @echo ' dir/file.[os] - Build specified target only' 1737 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1738 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1739 @echo ' The output is not intended to be compilable.' 1740 @echo ' dir/file.ll - Build the LLVM assembly file' 1741 @echo '' 1742 @$(if $(dtstree), \ 1743 echo 'Devicetree:'; \ 1744 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1745 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1746 echo ' dt_binding_check - Validate device tree binding documents'; \ 1747 echo ' dtbs_check - Validate device tree source files';\ 1748 echo '') 1749 1750 @echo 'Userspace tools targets:' 1751 @echo ' use "make tools/help"' 1752 @echo ' or "cd tools; make help"' 1753 @echo '' 1754 @echo 'Kernel packaging:' 1755 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1756 @echo '' 1757 @echo 'Documentation targets:' 1758 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1759 @echo '' 1760 @echo 'Architecture specific targets ($(SRCARCH)):' 1761 @$(or $(archhelp),\ 1762 echo ' No architecture specific help defined for $(SRCARCH)') 1763 @echo '' 1764 @$(if $(boards), \ 1765 $(foreach b, $(boards), \ 1766 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1767 echo '') 1768 @$(if $(board-dirs), \ 1769 $(foreach b, $(board-dirs), \ 1770 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1771 printf " %-16s - Show all of the above\\n" help-boards; \ 1772 echo '') 1773 1774 @echo ' make V=n [targets] 1: verbose build' 1775 @echo ' 2: give reason for rebuild of target' 1776 @echo ' V=1 and V=2 can be combined with V=12' 1777 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1778 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1779 @echo ' (sparse by default)' 1780 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1781 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1782 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1783 @echo ' 1: warnings which may be relevant and do not occur too often' 1784 @echo ' 2: warnings which occur quite often but may still be relevant' 1785 @echo ' 3: more obscure warnings, can most likely be ignored' 1786 @echo ' e: warnings are being treated as errors' 1787 @echo ' Multiple levels can be combined with W=12 or W=123' 1788 @$(if $(dtstree), \ 1789 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1790 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1791 ) 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 1885filechk_kernel.release = echo $(KERNELRELEASE) 1886 1887### 1888# External module support. 1889# When building external modules the kernel used as basis is considered 1890# read-only, and no consistency checks are made and the make 1891# system is not used on the basis kernel. If updates are required 1892# in the basis kernel ordinary make commands (without M=...) must be used. 1893 1894# We are always building only modules. 1895KBUILD_BUILTIN := 1896KBUILD_MODULES := 1 1897 1898build-dir := $(KBUILD_EXTMOD) 1899 1900compile_commands.json: $(extmod_prefix)compile_commands.json 1901PHONY += compile_commands.json 1902 1903clean-dirs := $(KBUILD_EXTMOD) 1904clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1905 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1906 1907PHONY += prepare 1908# now expand this into a simple variable to reduce the cost of shell evaluations 1909prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1910prepare: 1911 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1912 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1913 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1914 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1915 fi 1916 1917PHONY += help 1918help: 1919 @echo ' Building external modules.' 1920 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1921 @echo '' 1922 @echo ' modules - default target, build the module(s)' 1923 @echo ' modules_install - install the module' 1924 @echo ' clean - remove generated files in module directory only' 1925 @echo '' 1926 1927endif # KBUILD_EXTMOD 1928 1929# --------------------------------------------------------------------------- 1930# Modules 1931 1932PHONY += modules modules_install modules_prepare 1933 1934ifdef CONFIG_MODULES 1935 1936$(MODORDER): $(build-dir) 1937 @: 1938 1939# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1940# This is solely useful to speed up test compiles. 1941modules: modpost 1942ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1943 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1944endif 1945 1946PHONY += modules_check 1947modules_check: $(MODORDER) 1948 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1949 1950quiet_cmd_depmod = DEPMOD $(MODLIB) 1951 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1952 $(KERNELRELEASE) 1953 1954modules_install: 1955 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1956 $(call cmd,depmod) 1957 1958else # CONFIG_MODULES 1959 1960# Modules not configured 1961# --------------------------------------------------------------------------- 1962 1963modules modules_install: 1964 @echo >&2 '***' 1965 @echo >&2 '*** The present kernel configuration has modules disabled.' 1966 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1967 @echo >&2 '*** to enable CONFIG_MODULES.' 1968 @echo >&2 '***' 1969 @exit 1 1970 1971KBUILD_MODULES := 1972 1973endif # CONFIG_MODULES 1974 1975PHONY += modpost 1976modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1977 $(if $(KBUILD_MODULES), modules_check) 1978 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1979 1980# Single targets 1981# --------------------------------------------------------------------------- 1982# To build individual files in subdirectories, you can do like this: 1983# 1984# make foo/bar/baz.s 1985# 1986# The supported suffixes for single-target are listed in 'single-targets' 1987# 1988# To build only under specific subdirectories, you can do like this: 1989# 1990# make foo/bar/baz/ 1991 1992ifdef single-build 1993 1994# .ko is special because modpost is needed 1995single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1996single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1997 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1998 1999$(single-ko): single_modules 2000 @: 2001$(single-no-ko): $(build-dir) 2002 @: 2003 2004# Remove MODORDER when done because it is not the real one. 2005PHONY += single_modules 2006single_modules: $(single-no-ko) modules_prepare 2007 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2008 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2009ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2010 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2011endif 2012 $(Q)rm -f $(MODORDER) 2013 2014single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2015 2016KBUILD_MODULES := 1 2017 2018endif 2019 2020# Preset locale variables to speed up the build process. Limit locale 2021# tweaks to this spot to avoid wrong language settings when running 2022# make menuconfig etc. 2023# Error messages still appears in the original language 2024PHONY += $(build-dir) 2025$(build-dir): prepare 2026 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2027 2028clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2029PHONY += $(clean-dirs) clean 2030$(clean-dirs): 2031 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2032 2033clean: $(clean-dirs) 2034 $(call cmd,rmfiles) 2035 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2036 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2037 -o -name '*.ko.*' \ 2038 -o -name '*.dtb' -o -name '*.dtbo' \ 2039 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2040 -o -name '*.dt.yaml' \ 2041 -o -name '*.dwo' -o -name '*.lst' \ 2042 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2043 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2044 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2045 -o -name '*.asn1.[ch]' \ 2046 -o -name '*.symtypes' -o -name 'modules.order' \ 2047 -o -name '*.c.[012]*.*' \ 2048 -o -name '*.ll' \ 2049 -o -name '*.gcno' \ 2050 -o -name '*.*.symversions' \) -type f -print \ 2051 -o -name '.tmp_*' -print \ 2052 | xargs rm -rf 2053 2054# Generate tags for editors 2055# --------------------------------------------------------------------------- 2056quiet_cmd_tags = GEN $@ 2057 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2058 2059tags TAGS cscope gtags: FORCE 2060 $(call cmd,tags) 2061 2062# Script to generate missing namespace dependencies 2063# --------------------------------------------------------------------------- 2064 2065PHONY += nsdeps 2066nsdeps: export KBUILD_NSDEPS=1 2067nsdeps: modules 2068 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2069 2070# Clang Tooling 2071# --------------------------------------------------------------------------- 2072 2073quiet_cmd_gen_compile_commands = GEN $@ 2074 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2075 2076$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2077 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2078 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2079 $(call if_changed,gen_compile_commands) 2080 2081targets += $(extmod_prefix)compile_commands.json 2082 2083PHONY += clang-tidy clang-analyzer 2084 2085ifdef CONFIG_CC_IS_CLANG 2086quiet_cmd_clang_tools = CHECK $< 2087 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2088 2089clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2090 $(call cmd,clang_tools) 2091else 2092clang-tidy clang-analyzer: 2093 @echo "$@ requires CC=clang" >&2 2094 @false 2095endif 2096 2097# Scripts to check various things for consistency 2098# --------------------------------------------------------------------------- 2099 2100PHONY += includecheck versioncheck coccicheck export_report 2101 2102includecheck: 2103 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2104 -name '*.[hcS]' -type f -print | sort \ 2105 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2106 2107versioncheck: 2108 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2109 -name '*.[hcS]' -type f -print | sort \ 2110 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2111 2112coccicheck: 2113 $(Q)$(BASH) $(srctree)/scripts/$@ 2114 2115export_report: 2116 $(PERL) $(srctree)/scripts/export_report.pl 2117 2118PHONY += checkstack kernelrelease kernelversion image_name 2119 2120# UML needs a little special treatment here. It wants to use the host 2121# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2122# else wants $(ARCH), including people doing cross-builds, which means 2123# that $(SUBARCH) doesn't work here. 2124ifeq ($(ARCH), um) 2125CHECKSTACK_ARCH := $(SUBARCH) 2126else 2127CHECKSTACK_ARCH := $(ARCH) 2128endif 2129checkstack: 2130 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2131 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2132 2133kernelrelease: 2134 @$(filechk_kernel.release) 2135 2136kernelversion: 2137 @echo $(KERNELVERSION) 2138 2139image_name: 2140 @echo $(KBUILD_IMAGE) 2141 2142quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2143 cmd_rmfiles = rm -rf $(rm-files) 2144 2145# read saved command lines for existing targets 2146existing-targets := $(wildcard $(sort $(targets))) 2147 2148-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2149 2150endif # config-build 2151endif # mixed-build 2152endif # need-sub-make 2153 2154PHONY += FORCE 2155FORCE: 2156 2157# Declare the contents of the PHONY variable as phony. We keep that 2158# information in a variable so we can use it in if_changed and friends. 2159.PHONY: $(PHONY) 2160