1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 5 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 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42export abs_srctree := $(realpath $(dir $(this-makefile))) 43export abs_objtree := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 97 98ifeq ($(filter 3.%,$(MAKE_VERSION)),) 99short-opts := $(firstword -$(MAKEFLAGS)) 100else 101short-opts := $(filter-out --%,$(MAKEFLAGS)) 102endif 103 104ifneq ($(findstring s,$(short-opts)),) 105quiet=silent_ 106override KBUILD_VERBOSE := 107endif 108 109export quiet Q KBUILD_VERBOSE 110 111# Call a source code checker (by default, "sparse") as part of the 112# C compilation. 113# 114# Use 'make C=1' to enable checking of only re-compiled files. 115# Use 'make C=2' to enable checking of *all* source files, regardless 116# of whether they are re-compiled or not. 117# 118# See the file "Documentation/dev-tools/sparse.rst" for more details, 119# including where to get the "sparse" utility. 120 121ifeq ("$(origin C)", "command line") 122 KBUILD_CHECKSRC = $(C) 123endif 124ifndef KBUILD_CHECKSRC 125 KBUILD_CHECKSRC = 0 126endif 127 128export KBUILD_CHECKSRC 129 130# Enable "clippy" (a linter) as part of the Rust compilation. 131# 132# Use 'make CLIPPY=1' to enable it. 133ifeq ("$(origin CLIPPY)", "command line") 134 KBUILD_CLIPPY := $(CLIPPY) 135endif 136 137export KBUILD_CLIPPY 138 139# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 140# directory of external module to build. Setting M= takes precedence. 141ifeq ("$(origin M)", "command line") 142 KBUILD_EXTMOD := $(M) 143endif 144 145$(if $(word 2, $(KBUILD_EXTMOD)), \ 146 $(error building multiple external modules is not supported)) 147 148$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 149 $(error module directory path cannot contain '$x'))) 150 151# Remove trailing slashes 152ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 153KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 154endif 155 156export KBUILD_EXTMOD 157 158# Kbuild will save output files in the current working directory. 159# This does not need to match to the root of the kernel source tree. 160# 161# For example, you can do this: 162# 163# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 164# 165# If you want to save output files in a different location, there are 166# two syntaxes to specify it. 167# 168# 1) O= 169# Use "make O=dir/to/store/output/files/" 170# 171# 2) Set KBUILD_OUTPUT 172# Set the environment variable KBUILD_OUTPUT to point to the output directory. 173# export KBUILD_OUTPUT=dir/to/store/output/files/; make 174# 175# The O= assignment takes precedence over the KBUILD_OUTPUT environment 176# variable. 177 178# Do we want to change the working directory? 179ifeq ("$(origin O)", "command line") 180 KBUILD_OUTPUT := $(O) 181endif 182 183ifneq ($(KBUILD_OUTPUT),) 184# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 185# expand a shell special character '~'. We use a somewhat tedious way here. 186abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 187$(if $(abs_objtree),, \ 188 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 189 190# $(realpath ...) resolves symlinks 191abs_objtree := $(realpath $(abs_objtree)) 192endif # ifneq ($(KBUILD_OUTPUT),) 193 194ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 195$(error source directory cannot contain spaces or colons) 196endif 197 198ifneq ($(filter 3.%,$(MAKE_VERSION)),) 199# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 200# We need to invoke sub-make to avoid implicit rules in the top Makefile. 201need-sub-make := 1 202# Cancel implicit rules for this Makefile. 203$(this-makefile): ; 204endif 205 206export sub_make_done := 1 207 208endif # sub_make_done 209 210ifeq ($(abs_objtree),$(CURDIR)) 211# Suppress "Entering directory ..." if we are at the final work directory. 212no-print-directory := --no-print-directory 213else 214# Recursion to show "Entering directory ..." 215need-sub-make := 1 216endif 217 218ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 219# If --no-print-directory is unset, recurse once again to set it. 220# You may end up recursing into __sub-make twice. This is needed due to the 221# behavior change in GNU Make 4.4.1. 222need-sub-make := 1 223endif 224 225ifeq ($(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) $(no-print-directory) -C $(abs_objtree) \ 235 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 236 237else # need-sub-make 238 239# We process the rest of the Makefile if this is the final invocation of make 240 241ifeq ($(abs_srctree),$(abs_objtree)) 242 # building in the source tree 243 srctree := . 244 building_out_of_srctree := 245else 246 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 247 # building in a subdirectory of the source tree 248 srctree := .. 249 else 250 srctree := $(abs_srctree) 251 endif 252 building_out_of_srctree := 1 253endif 254 255ifneq ($(KBUILD_ABS_SRCTREE),) 256srctree := $(abs_srctree) 257endif 258 259objtree := . 260VPATH := $(srctree) 261 262export building_out_of_srctree srctree objtree VPATH 263 264# To make sure we do not include .config for any of the *config targets 265# catch them early, and hand them over to scripts/kconfig/Makefile 266# It is allowed to specify more targets when calling make, including 267# mixing *config targets and build targets. 268# For example 'make oldconfig all'. 269# Detect when mixed targets is specified, and make a second invocation 270# of make so .config is not included in this case either (for *config). 271 272version_h := include/generated/uapi/linux/version.h 273 274clean-targets := %clean mrproper cleandocs 275no-dot-config-targets := $(clean-targets) \ 276 cscope gtags TAGS tags help% %docs check% coccicheck \ 277 $(version_h) headers headers_% archheaders archscripts \ 278 %asm-generic kernelversion %src-pkg dt_binding_check \ 279 outputmakefile rustavailable rustfmt rustfmtcheck 280# Installation targets should not require compiler. Unfortunately, vdso_install 281# is an exception where build artifacts may be updated. This must be fixed. 282no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 283 headers_install modules_install kernelrelease image_name 284no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 285 image_name 286single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 287 288config-build := 289mixed-build := 290need-config := 1 291need-compiler := 1 292may-sync-config := 1 293single-build := 294 295ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 296 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 297 need-config := 298 endif 299endif 300 301ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 302 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 303 need-compiler := 304 endif 305endif 306 307ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 308 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 309 may-sync-config := 310 endif 311endif 312 313ifneq ($(KBUILD_EXTMOD),) 314 may-sync-config := 315endif 316 317ifeq ($(KBUILD_EXTMOD),) 318 ifneq ($(filter %config,$(MAKECMDGOALS)),) 319 config-build := 1 320 ifneq ($(words $(MAKECMDGOALS)),1) 321 mixed-build := 1 322 endif 323 endif 324endif 325 326# We cannot build single targets and the others at the same time 327ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 328 single-build := 1 329 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 330 mixed-build := 1 331 endif 332endif 333 334# For "make -j clean all", "make -j mrproper defconfig all", etc. 335ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 336 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 337 mixed-build := 1 338 endif 339endif 340 341# install and modules_install need also be processed one by one 342ifneq ($(filter install,$(MAKECMDGOALS)),) 343 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 344 mixed-build := 1 345 endif 346endif 347 348ifdef mixed-build 349# =========================================================================== 350# We're called with mixed targets (*config and build targets). 351# Handle them one by one. 352 353PHONY += $(MAKECMDGOALS) __build_one_by_one 354 355$(MAKECMDGOALS): __build_one_by_one 356 @: 357 358__build_one_by_one: 359 $(Q)set -e; \ 360 for i in $(MAKECMDGOALS); do \ 361 $(MAKE) -f $(srctree)/Makefile $$i; \ 362 done 363 364else # !mixed-build 365 366include $(srctree)/scripts/Kbuild.include 367 368# Read KERNELRELEASE from include/config/kernel.release (if it exists) 369KERNELRELEASE = $(call read-file, include/config/kernel.release) 370KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 371export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 372 373include $(srctree)/scripts/subarch.include 374 375# Cross compiling and selecting different set of gcc/bin-utils 376# --------------------------------------------------------------------------- 377# 378# When performing cross compilation for other architectures ARCH shall be set 379# to the target architecture. (See arch/* for the possibilities). 380# ARCH can be set during invocation of make: 381# make ARCH=ia64 382# Another way is to have ARCH set in the environment. 383# The default ARCH is the host where make is executed. 384 385# CROSS_COMPILE specify the prefix used for all executables used 386# during compilation. Only gcc and related bin-utils executables 387# are prefixed with $(CROSS_COMPILE). 388# CROSS_COMPILE can be set on the command line 389# make CROSS_COMPILE=ia64-linux- 390# Alternatively CROSS_COMPILE can be set in the environment. 391# Default value for CROSS_COMPILE is not to prefix executables 392# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 393ARCH ?= $(SUBARCH) 394 395# Architecture as present in compile.h 396UTS_MACHINE := $(ARCH) 397SRCARCH := $(ARCH) 398 399# Additional ARCH settings for x86 400ifeq ($(ARCH),i386) 401 SRCARCH := x86 402endif 403ifeq ($(ARCH),x86_64) 404 SRCARCH := x86 405endif 406 407# Additional ARCH settings for sparc 408ifeq ($(ARCH),sparc32) 409 SRCARCH := sparc 410endif 411ifeq ($(ARCH),sparc64) 412 SRCARCH := sparc 413endif 414 415# Additional ARCH settings for parisc 416ifeq ($(ARCH),parisc64) 417 SRCARCH := parisc 418endif 419 420export cross_compiling := 421ifneq ($(SRCARCH),$(SUBARCH)) 422cross_compiling := 1 423endif 424 425KCONFIG_CONFIG ?= .config 426export KCONFIG_CONFIG 427 428# SHELL used by kbuild 429CONFIG_SHELL := sh 430 431HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 432HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 433HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 434 435ifneq ($(LLVM),) 436ifneq ($(filter %/,$(LLVM)),) 437LLVM_PREFIX := $(LLVM) 438else ifneq ($(filter -%,$(LLVM)),) 439LLVM_SUFFIX := $(LLVM) 440endif 441 442HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 443HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 444else 445HOSTCC = gcc 446HOSTCXX = g++ 447endif 448HOSTRUSTC = rustc 449HOSTPKG_CONFIG = pkg-config 450 451KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 452 -O2 -fomit-frame-pointer -std=gnu11 453KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 454KBUILD_USERLDFLAGS := $(USERLDFLAGS) 455 456# These flags apply to all Rust code in the tree, including the kernel and 457# host programs. 458export rust_common_flags := --edition=2021 \ 459 -Zbinary_dep_depinfo=y \ 460 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 461 -Dunreachable_pub -Dnon_ascii_idents \ 462 -Wmissing_docs \ 463 -Drustdoc::missing_crate_level_docs \ 464 -Dclippy::correctness -Dclippy::style \ 465 -Dclippy::suspicious -Dclippy::complexity \ 466 -Dclippy::perf \ 467 -Dclippy::let_unit_value -Dclippy::mut_mut \ 468 -Dclippy::needless_bitwise_bool \ 469 -Dclippy::needless_continue \ 470 -Wclippy::dbg_macro 471 472KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 473KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 474KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 475 -Zallow-features= $(HOSTRUSTFLAGS) 476KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 477KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 478 479# Make variables (CC, etc...) 480CPP = $(CC) -E 481ifneq ($(LLVM),) 482CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 483LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 484AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 485NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 486OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 487OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 488READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 489STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 490else 491CC = $(CROSS_COMPILE)gcc 492LD = $(CROSS_COMPILE)ld 493AR = $(CROSS_COMPILE)ar 494NM = $(CROSS_COMPILE)nm 495OBJCOPY = $(CROSS_COMPILE)objcopy 496OBJDUMP = $(CROSS_COMPILE)objdump 497READELF = $(CROSS_COMPILE)readelf 498STRIP = $(CROSS_COMPILE)strip 499endif 500RUSTC = rustc 501RUSTDOC = rustdoc 502RUSTFMT = rustfmt 503CLIPPY_DRIVER = clippy-driver 504BINDGEN = bindgen 505CARGO = cargo 506PAHOLE = pahole 507RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 508LEX = flex 509YACC = bison 510AWK = awk 511INSTALLKERNEL := installkernel 512DEPMOD = depmod 513PERL = perl 514PYTHON3 = python3 515CHECK = sparse 516BASH = bash 517KGZIP = gzip 518KBZIP2 = bzip2 519KLZOP = lzop 520LZMA = lzma 521LZ4 = lz4c 522XZ = xz 523ZSTD = zstd 524 525PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 526 527CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 528 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 529NOSTDINC_FLAGS := 530CFLAGS_MODULE = 531RUSTFLAGS_MODULE = 532AFLAGS_MODULE = 533LDFLAGS_MODULE = 534CFLAGS_KERNEL = 535RUSTFLAGS_KERNEL = 536AFLAGS_KERNEL = 537LDFLAGS_vmlinux = 538 539# Use USERINCLUDE when you must reference the UAPI directories only. 540USERINCLUDE := \ 541 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 542 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 543 -I$(srctree)/include/uapi \ 544 -I$(objtree)/include/generated/uapi \ 545 -include $(srctree)/include/linux/compiler-version.h \ 546 -include $(srctree)/include/linux/kconfig.h 547 548# Use LINUXINCLUDE when you must reference the include/ directory. 549# Needed to be compatible with the O= option 550LINUXINCLUDE := \ 551 -I$(srctree)/arch/$(SRCARCH)/include \ 552 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 553 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 554 -I$(objtree)/include \ 555 $(USERINCLUDE) 556 557KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 558 559KBUILD_CFLAGS := 560KBUILD_CFLAGS += -std=gnu11 561KBUILD_CFLAGS += -fshort-wchar 562KBUILD_CFLAGS += -funsigned-char 563KBUILD_CFLAGS += -fno-common 564KBUILD_CFLAGS += -fno-PIE 565KBUILD_CFLAGS += -fno-strict-aliasing 566KBUILD_CFLAGS += -Wall 567KBUILD_CFLAGS += -Wundef 568KBUILD_CFLAGS += -Werror=implicit-function-declaration 569KBUILD_CFLAGS += -Werror=implicit-int 570KBUILD_CFLAGS += -Werror=return-type 571KBUILD_CFLAGS += -Werror=strict-prototypes 572KBUILD_CFLAGS += -Wno-format-security 573KBUILD_CFLAGS += -Wno-trigraphs 574 575KBUILD_CPPFLAGS := -D__KERNEL__ 576KBUILD_RUSTFLAGS := $(rust_common_flags) \ 577 --target=$(objtree)/scripts/target.json \ 578 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 579 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 580 -Csymbol-mangling-version=v0 \ 581 -Crelocation-model=static \ 582 -Zfunction-sections=n \ 583 -Dclippy::float_arithmetic 584 585KBUILD_AFLAGS_KERNEL := 586KBUILD_CFLAGS_KERNEL := 587KBUILD_RUSTFLAGS_KERNEL := 588KBUILD_AFLAGS_MODULE := -DMODULE 589KBUILD_CFLAGS_MODULE := -DMODULE 590KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 591KBUILD_LDFLAGS_MODULE := 592KBUILD_LDFLAGS := 593CLANG_FLAGS := 594 595ifeq ($(KBUILD_CLIPPY),1) 596 RUSTC_OR_CLIPPY_QUIET := CLIPPY 597 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 598else 599 RUSTC_OR_CLIPPY_QUIET := RUSTC 600 RUSTC_OR_CLIPPY = $(RUSTC) 601endif 602 603ifdef RUST_LIB_SRC 604 export RUST_LIB_SRC 605endif 606 607# Allows the usage of unstable features in stable compilers. 608export RUSTC_BOOTSTRAP := 1 609 610export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 611export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 612export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 613export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 614export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 615export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 616export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 617export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 618 619export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 620export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 621export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 622export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 623export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 624export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 625export PAHOLE_FLAGS 626 627# Files to ignore in find ... statements 628 629export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 630 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 631 -prune -o 632export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 633 --exclude CVS --exclude .pc --exclude .hg --exclude .git 634 635# =========================================================================== 636# Rules shared between *config targets and build targets 637 638# Basic helpers built in scripts/basic/ 639PHONY += scripts_basic 640scripts_basic: 641 $(Q)$(MAKE) $(build)=scripts/basic 642 643PHONY += outputmakefile 644ifdef building_out_of_srctree 645# Before starting out-of-tree build, make sure the source tree is clean. 646# outputmakefile generates a Makefile in the output directory, if using a 647# separate output directory. This allows convenient use of make in the 648# output directory. 649# At the same time when output Makefile generated, generate .gitignore to 650# ignore whole output directory 651 652quiet_cmd_makefile = GEN Makefile 653 cmd_makefile = { \ 654 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 655 echo "include $(srctree)/Makefile"; \ 656 } > Makefile 657 658outputmakefile: 659 @if [ -f $(srctree)/.config -o \ 660 -d $(srctree)/include/config -o \ 661 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 662 echo >&2 "***"; \ 663 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 664 echo >&2 "*** in $(abs_srctree)";\ 665 echo >&2 "***"; \ 666 false; \ 667 fi 668 $(Q)ln -fsn $(srctree) source 669 $(call cmd,makefile) 670 $(Q)test -e .gitignore || \ 671 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 672endif 673 674# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 675# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 676# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 677# and from include/config/auto.conf.cmd to detect the compiler upgrade. 678CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 679 680ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 681include $(srctree)/scripts/Makefile.clang 682endif 683 684# Include this also for config targets because some architectures need 685# cc-cross-prefix to determine CROSS_COMPILE. 686ifdef need-compiler 687include $(srctree)/scripts/Makefile.compiler 688endif 689 690ifdef config-build 691# =========================================================================== 692# *config targets only - make sure prerequisites are updated, and descend 693# in scripts/kconfig to make the *config target 694 695# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 696# KBUILD_DEFCONFIG may point out an alternative default configuration 697# used for 'make defconfig' 698include $(srctree)/arch/$(SRCARCH)/Makefile 699export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 700 701config: outputmakefile scripts_basic FORCE 702 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 703 704%config: outputmakefile scripts_basic FORCE 705 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 706 707else #!config-build 708# =========================================================================== 709# Build targets only - this includes vmlinux, arch specific targets, clean 710# targets and others. In general all targets except *config targets. 711 712# If building an external module we do not care about the all: rule 713# but instead __all depend on modules 714PHONY += all 715ifeq ($(KBUILD_EXTMOD),) 716__all: all 717else 718__all: modules 719endif 720 721targets := 722 723# Decide whether to build built-in, modular, or both. 724# Normally, just do built-in. 725 726KBUILD_MODULES := 727KBUILD_BUILTIN := 1 728 729# If we have only "make modules", don't compile built-in objects. 730ifeq ($(MAKECMDGOALS),modules) 731 KBUILD_BUILTIN := 732endif 733 734# If we have "make <whatever> modules", compile modules 735# in addition to whatever we do anyway. 736# Just "make" or "make all" shall build modules as well 737 738ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 739 KBUILD_MODULES := 1 740endif 741 742ifeq ($(MAKECMDGOALS),) 743 KBUILD_MODULES := 1 744endif 745 746export KBUILD_MODULES KBUILD_BUILTIN 747 748ifdef need-config 749include include/config/auto.conf 750endif 751 752ifeq ($(KBUILD_EXTMOD),) 753# Objects we will link into vmlinux / subdirs we need to visit 754core-y := 755drivers-y := 756libs-y := lib/ 757endif # KBUILD_EXTMOD 758 759# The all: target is the default when no target is given on the 760# command line. 761# This allow a user to issue only 'make' to build a kernel including modules 762# Defaults to vmlinux, but the arch makefile usually adds further targets 763all: vmlinux 764 765CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 766ifdef CONFIG_CC_IS_GCC 767CFLAGS_GCOV += -fno-tree-loop-im 768endif 769export CFLAGS_GCOV 770 771# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 772ifdef CONFIG_FUNCTION_TRACER 773 CC_FLAGS_FTRACE := -pg 774endif 775 776include $(srctree)/arch/$(SRCARCH)/Makefile 777 778ifdef need-config 779ifdef may-sync-config 780# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 781# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 782# because some architectures define CROSS_COMPILE there. 783include include/config/auto.conf.cmd 784 785$(KCONFIG_CONFIG): 786 @echo >&2 '***' 787 @echo >&2 '*** Configuration file "$@" not found!' 788 @echo >&2 '***' 789 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 790 @echo >&2 '*** "make menuconfig" or "make xconfig").' 791 @echo >&2 '***' 792 @/bin/false 793 794# The actual configuration files used during the build are stored in 795# include/generated/ and include/config/. Update them if .config is newer than 796# include/config/auto.conf (which mirrors .config). 797# 798# This exploits the 'multi-target pattern rule' trick. 799# The syncconfig should be executed only once to make all the targets. 800# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 801# 802# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 803# so you cannot notice that Kconfig is waiting for the user input. 804%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 805 $(Q)$(kecho) " SYNC $@" 806 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 807else # !may-sync-config 808# External modules and some install targets need include/generated/autoconf.h 809# and include/config/auto.conf but do not care if they are up-to-date. 810# Use auto.conf to trigger the test 811PHONY += include/config/auto.conf 812 813include/config/auto.conf: 814 @test -e include/generated/autoconf.h -a -e $@ || ( \ 815 echo >&2; \ 816 echo >&2 " ERROR: Kernel configuration is invalid."; \ 817 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 818 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 819 echo >&2 ; \ 820 /bin/false) 821 822endif # may-sync-config 823endif # need-config 824 825KBUILD_CFLAGS += -fno-delete-null-pointer-checks 826KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 827KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 828KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 829KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 830 831ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 832KBUILD_CFLAGS += -O2 833KBUILD_RUSTFLAGS += -Copt-level=2 834else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 835KBUILD_CFLAGS += -Os 836KBUILD_RUSTFLAGS += -Copt-level=s 837endif 838 839# Always set `debug-assertions` and `overflow-checks` because their default 840# depends on `opt-level` and `debug-assertions`, respectively. 841KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 842KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 843 844# Tell gcc to never replace conditional load with a non-conditional one 845ifdef CONFIG_CC_IS_GCC 846# gcc-10 renamed --param=allow-store-data-races=0 to 847# -fno-allow-store-data-races. 848KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 849KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 850endif 851 852ifdef CONFIG_READABLE_ASM 853# Disable optimizations that make assembler listings hard to read. 854# reorder blocks reorders the control in the function 855# ipa clone creates specialized cloned functions 856# partial inlining inlines only parts of functions 857KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 858endif 859 860ifneq ($(CONFIG_FRAME_WARN),0) 861KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 862endif 863 864stackp-flags-y := -fno-stack-protector 865stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 866stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 867 868KBUILD_CFLAGS += $(stackp-flags-y) 869 870KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 871KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 872KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 873 874KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 875KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 876 877ifdef CONFIG_CC_IS_CLANG 878# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 879KBUILD_CFLAGS += -Wno-gnu 880else 881 882# gcc inanely warns about local variables called 'main' 883KBUILD_CFLAGS += -Wno-main 884endif 885 886# These warnings generated too much noise in a regular build. 887# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 888KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 889KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 890 891# These result in bogus false positives 892KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 893 894ifdef CONFIG_FRAME_POINTER 895KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 896KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 897else 898# Some targets (ARM with Thumb2, for example), can't be built with frame 899# pointers. For those, we don't have FUNCTION_TRACER automatically 900# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 901# incompatible with -fomit-frame-pointer with current GCC, so we don't use 902# -fomit-frame-pointer with FUNCTION_TRACER. 903# In the Rust target specification, "frame-pointer" is set explicitly 904# to "may-omit". 905ifndef CONFIG_FUNCTION_TRACER 906KBUILD_CFLAGS += -fomit-frame-pointer 907endif 908endif 909 910# Initialize all stack variables with a 0xAA pattern. 911ifdef CONFIG_INIT_STACK_ALL_PATTERN 912KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 913endif 914 915# Initialize all stack variables with a zero value. 916ifdef CONFIG_INIT_STACK_ALL_ZERO 917KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 918ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 919# https://github.com/llvm/llvm-project/issues/44842 920CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 921export CC_AUTO_VAR_INIT_ZERO_ENABLER 922KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 923endif 924endif 925 926# While VLAs have been removed, GCC produces unreachable stack probes 927# for the randomize_kstack_offset feature. Disable it for all compilers. 928KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 929 930# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 931ifdef CONFIG_ZERO_CALL_USED_REGS 932KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 933endif 934 935ifdef CONFIG_FUNCTION_TRACER 936ifdef CONFIG_FTRACE_MCOUNT_USE_CC 937 CC_FLAGS_FTRACE += -mrecord-mcount 938 ifdef CONFIG_HAVE_NOP_MCOUNT 939 ifeq ($(call cc-option-yn, -mnop-mcount),y) 940 CC_FLAGS_FTRACE += -mnop-mcount 941 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 942 endif 943 endif 944endif 945ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 946 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 947 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 948 endif 949endif 950ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 951 ifdef CONFIG_HAVE_C_RECORDMCOUNT 952 BUILD_C_RECORDMCOUNT := y 953 export BUILD_C_RECORDMCOUNT 954 endif 955endif 956ifdef CONFIG_HAVE_FENTRY 957 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 958 ifeq ($(call cc-option-yn, -mfentry),y) 959 CC_FLAGS_FTRACE += -mfentry 960 CC_FLAGS_USING += -DCC_USING_FENTRY 961 endif 962endif 963export CC_FLAGS_FTRACE 964KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 965KBUILD_AFLAGS += $(CC_FLAGS_USING) 966endif 967 968# We trigger additional mismatches with less inlining 969ifdef CONFIG_DEBUG_SECTION_MISMATCH 970KBUILD_CFLAGS += -fno-inline-functions-called-once 971endif 972 973# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 974ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 975KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 976KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 977LDFLAGS_vmlinux += --gc-sections 978endif 979 980ifdef CONFIG_SHADOW_CALL_STACK 981ifndef CONFIG_DYNAMIC_SCS 982CC_FLAGS_SCS := -fsanitize=shadow-call-stack 983KBUILD_CFLAGS += $(CC_FLAGS_SCS) 984endif 985export CC_FLAGS_SCS 986endif 987 988ifdef CONFIG_LTO_CLANG 989ifdef CONFIG_LTO_CLANG_THIN 990CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 991KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 992else 993CC_FLAGS_LTO := -flto 994endif 995CC_FLAGS_LTO += -fvisibility=hidden 996 997# Limit inlining across translation units to reduce binary size 998KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 999 1000# Check for frame size exceeding threshold during prolog/epilog insertion 1001# when using lld < 13.0.0. 1002ifneq ($(CONFIG_FRAME_WARN),0) 1003ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 1004KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 1005endif 1006endif 1007endif 1008 1009ifdef CONFIG_LTO 1010KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1011KBUILD_AFLAGS += -fno-lto 1012export CC_FLAGS_LTO 1013endif 1014 1015ifdef CONFIG_CFI_CLANG 1016CC_FLAGS_CFI := -fsanitize=kcfi 1017KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1018export CC_FLAGS_CFI 1019endif 1020 1021ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1022KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1023endif 1024 1025# arch Makefile may override CC so keep this after arch Makefile is included 1026NOSTDINC_FLAGS += -nostdinc 1027 1028# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1029KBUILD_CFLAGS += -Wvla 1030 1031# disable pointer signed / unsigned warnings in gcc 4.0 1032KBUILD_CFLAGS += -Wno-pointer-sign 1033 1034# In order to make sure new function cast mismatches are not introduced 1035# in the kernel (to avoid tripping CFI checking), the kernel should be 1036# globally built with -Wcast-function-type. 1037KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1038 1039# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1040# the kernel uses only C99 flexible arrays for dynamically sized trailing 1041# arrays. Enforce this for everything that may examine structure sizes and 1042# perform bounds checking. 1043KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1044 1045# disable stringop warnings in gcc 8+ 1046KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1047 1048# We'll want to enable this eventually, but it's not going away for 5.7 at least 1049KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1050 1051# Another good warning that we'll want to enable eventually 1052KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1053 1054# Enabled with W=2, disabled by default as noisy 1055ifdef CONFIG_CC_IS_GCC 1056KBUILD_CFLAGS += -Wno-maybe-uninitialized 1057endif 1058 1059# The allocators already balk at large sizes, so silence the compiler 1060# warnings for bounds checks involving those possible values. While 1061# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1062# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1063# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1064# doesn't work (as it is documented to), silently resolving to "0" prior to 1065# version 9.1 (and producing an error more recently). Numeric values larger 1066# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1067# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1068# choice, we must perform a versioned check to disable this warning. 1069# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1070KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1071KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1072 1073# disable invalid "can't wrap" optimizations for signed / pointers 1074KBUILD_CFLAGS += -fno-strict-overflow 1075 1076# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1077KBUILD_CFLAGS += -fno-stack-check 1078 1079# conserve stack if available 1080ifdef CONFIG_CC_IS_GCC 1081KBUILD_CFLAGS += -fconserve-stack 1082endif 1083 1084# Prohibit date/time macros, which would make the build non-deterministic 1085KBUILD_CFLAGS += -Werror=date-time 1086 1087# enforce correct pointer usage 1088KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1089 1090# Require designated initializers for all marked structures 1091KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1092 1093# change __FILE__ to the relative path from the srctree 1094KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1095 1096# include additional Makefiles when needed 1097include-y := scripts/Makefile.extrawarn 1098include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1099include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1100include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1101include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1102include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1103include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1104include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1105include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1106 1107include $(addprefix $(srctree)/, $(include-y)) 1108 1109# scripts/Makefile.gcc-plugins is intentionally included last. 1110# Do not add $(call cc-option,...) below this line. When you build the kernel 1111# from the clean source tree, the GCC plugins do not exist at this point. 1112 1113# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1114KBUILD_CPPFLAGS += $(KCPPFLAGS) 1115KBUILD_AFLAGS += $(KAFLAGS) 1116KBUILD_CFLAGS += $(KCFLAGS) 1117KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1118 1119KBUILD_LDFLAGS_MODULE += --build-id=sha1 1120LDFLAGS_vmlinux += --build-id=sha1 1121 1122KBUILD_LDFLAGS += -z noexecstack 1123ifeq ($(CONFIG_LD_IS_BFD),y) 1124KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1125endif 1126 1127ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1128LDFLAGS_vmlinux += -X 1129endif 1130 1131ifeq ($(CONFIG_RELR),y) 1132# ld.lld before 15 did not support -z pack-relative-relocs. 1133LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1134endif 1135 1136# We never want expected sections to be placed heuristically by the 1137# linker. All sections should be explicitly named in the linker script. 1138ifdef CONFIG_LD_ORPHAN_WARN 1139LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1140endif 1141 1142# Align the bit size of userspace programs with the kernel 1143KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1144KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1145 1146# make the checker run with the right architecture 1147CHECKFLAGS += --arch=$(ARCH) 1148 1149# insure the checker run with the right endianness 1150CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1151 1152# the checker needs the correct machine size 1153CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1154 1155# Default kernel image to build when no specific target is given. 1156# KBUILD_IMAGE may be overruled on the command line or 1157# set in the environment 1158# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1159# this default value 1160export KBUILD_IMAGE ?= vmlinux 1161 1162# 1163# INSTALL_PATH specifies where to place the updated kernel and system map 1164# images. Default is /boot, but you can set it to other values 1165export INSTALL_PATH ?= /boot 1166 1167# 1168# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1169# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1170# an argument if needed. Otherwise it defaults to the kernel install path 1171# 1172export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1173 1174# 1175# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1176# relocations required by build roots. This is not defined in the 1177# makefile but the argument can be passed to make if needed. 1178# 1179 1180MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1181export MODLIB 1182 1183PHONY += prepare0 1184 1185export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1186export MODORDER := $(extmod_prefix)modules.order 1187export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1188 1189ifeq ($(KBUILD_EXTMOD),) 1190 1191build-dir := . 1192clean-dirs := $(sort . Documentation \ 1193 $(patsubst %/,%,$(filter %/, $(core-) \ 1194 $(drivers-) $(libs-)))) 1195 1196export ARCH_CORE := $(core-y) 1197export ARCH_LIB := $(filter %/, $(libs-y)) 1198export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1199# Externally visible symbols (used by link-vmlinux.sh) 1200 1201KBUILD_VMLINUX_OBJS := ./built-in.a 1202ifdef CONFIG_MODULES 1203KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1204KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1205else 1206KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1207endif 1208 1209export KBUILD_VMLINUX_LIBS 1210export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1211 1212ifdef CONFIG_TRIM_UNUSED_KSYMS 1213# For the kernel to actually contain only the needed exported symbols, 1214# we have to build modules as well to determine what those symbols are. 1215KBUILD_MODULES := 1 1216endif 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 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) 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 1564endif # CONFIG_MODULES 1565 1566modinst_pre := 1567ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1568modinst_pre := __modinst_pre 1569endif 1570 1571modules_install: $(modinst_pre) 1572PHONY += __modinst_pre 1573__modinst_pre: 1574 @rm -rf $(MODLIB)/kernel 1575 @rm -f $(MODLIB)/source 1576 @mkdir -p $(MODLIB) 1577ifdef CONFIG_MODULES 1578 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1579 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1580 rm -f $(MODLIB)/build ; \ 1581 ln -s $(CURDIR) $(MODLIB)/build ; \ 1582 fi 1583 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1584endif 1585 @cp -f modules.builtin $(MODLIB)/ 1586 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1587 1588### 1589# Cleaning is done on three levels. 1590# make clean Delete most generated files 1591# Leave enough to build external modules 1592# make mrproper Delete the current configuration, and all generated files 1593# make distclean Remove editor backup files, patch leftover files and the like 1594 1595# Directories & files removed with 'make clean' 1596CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1597 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1598 compile_commands.json .thinlto-cache rust/test rust/doc \ 1599 rust-project.json .vmlinux.objs .vmlinux.export.c 1600 1601# Directories & files removed with 'make mrproper' 1602MRPROPER_FILES += include/config include/generated \ 1603 arch/$(SRCARCH)/include/generated .objdiff \ 1604 debian snap tar-install \ 1605 .config .config.old .version \ 1606 Module.symvers \ 1607 certs/signing_key.pem \ 1608 certs/x509.genkey \ 1609 vmlinux-gdb.py \ 1610 *.spec rpmbuild \ 1611 rust/libmacros.so 1612 1613# clean - Delete most, but leave enough to build external modules 1614# 1615clean: rm-files := $(CLEAN_FILES) 1616 1617PHONY += archclean vmlinuxclean 1618 1619vmlinuxclean: 1620 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1621 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1622 1623clean: archclean vmlinuxclean resolve_btfids_clean 1624 1625# mrproper - Delete all generated files, including .config 1626# 1627mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1628mrproper-dirs := $(addprefix _mrproper_,scripts) 1629 1630PHONY += $(mrproper-dirs) mrproper 1631$(mrproper-dirs): 1632 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1633 1634mrproper: clean $(mrproper-dirs) 1635 $(call cmd,rmfiles) 1636 @find . $(RCS_FIND_IGNORE) \ 1637 \( -name '*.rmeta' \) \ 1638 -type f -print | xargs rm -f 1639 1640# distclean 1641# 1642PHONY += distclean 1643 1644distclean: mrproper 1645 @find . $(RCS_FIND_IGNORE) \ 1646 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1647 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1648 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1649 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1650 -type f -print | xargs rm -f 1651 1652 1653# Packaging of the kernel to various formats 1654# --------------------------------------------------------------------------- 1655 1656%src-pkg: FORCE 1657 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1658%pkg: include/config/kernel.release FORCE 1659 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1660 1661# Brief documentation of the typical targets used 1662# --------------------------------------------------------------------------- 1663 1664boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1665boards := $(sort $(notdir $(boards))) 1666board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1667board-dirs := $(sort $(notdir $(board-dirs:/=))) 1668 1669PHONY += help 1670help: 1671 @echo 'Cleaning targets:' 1672 @echo ' clean - Remove most generated files but keep the config and' 1673 @echo ' enough build support to build external modules' 1674 @echo ' mrproper - Remove all generated files + config + various backup files' 1675 @echo ' distclean - mrproper + remove editor backup and patch files' 1676 @echo '' 1677 @echo 'Configuration targets:' 1678 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1679 @echo '' 1680 @echo 'Other generic targets:' 1681 @echo ' all - Build all targets marked with [*]' 1682 @echo '* vmlinux - Build the bare kernel' 1683 @echo '* modules - Build all modules' 1684 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1685 @echo ' dir/ - Build all files in dir and below' 1686 @echo ' dir/file.[ois] - Build specified target only' 1687 @echo ' dir/file.ll - Build the LLVM assembly file' 1688 @echo ' (requires compiler support for LLVM assembly generation)' 1689 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1690 @echo ' (requires a recent binutils and recent build (System.map))' 1691 @echo ' dir/file.ko - Build module including final link' 1692 @echo ' modules_prepare - Set up for building external modules' 1693 @echo ' tags/TAGS - Generate tags file for editors' 1694 @echo ' cscope - Generate cscope index' 1695 @echo ' gtags - Generate GNU GLOBAL index' 1696 @echo ' kernelrelease - Output the release version string (use with make -s)' 1697 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1698 @echo ' image_name - Output the image name (use with make -s)' 1699 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1700 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1701 echo '' 1702 @echo 'Static analysers:' 1703 @echo ' checkstack - Generate a list of stack hogs' 1704 @echo ' versioncheck - Sanity check on version.h usage' 1705 @echo ' includecheck - Check for duplicate included header files' 1706 @echo ' export_report - List the usages of all exported symbols' 1707 @echo ' headerdep - Detect inclusion cycles in headers' 1708 @echo ' coccicheck - Check with Coccinelle' 1709 @echo ' clang-analyzer - Check with clang static analyzer' 1710 @echo ' clang-tidy - Check with clang-tidy' 1711 @echo '' 1712 @echo 'Tools:' 1713 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1714 @echo '' 1715 @echo 'Kernel selftest:' 1716 @echo ' kselftest - Build and run kernel selftest' 1717 @echo ' Build, install, and boot kernel before' 1718 @echo ' running kselftest on it' 1719 @echo ' Run as root for full coverage' 1720 @echo ' kselftest-all - Build kernel selftest' 1721 @echo ' kselftest-install - Build and install kernel selftest' 1722 @echo ' kselftest-clean - Remove all generated kselftest files' 1723 @echo ' kselftest-merge - Merge all the config dependencies of' 1724 @echo ' kselftest to existing .config.' 1725 @echo '' 1726 @echo 'Rust targets:' 1727 @echo ' rustavailable - Checks whether the Rust toolchain is' 1728 @echo ' available and, if not, explains why.' 1729 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1730 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1731 @echo ' is formatted, printing a diff otherwise.' 1732 @echo ' rustdoc - Generate Rust documentation' 1733 @echo ' (requires kernel .config)' 1734 @echo ' rusttest - Runs the Rust tests' 1735 @echo ' (requires kernel .config; downloads external repos)' 1736 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1737 @echo ' (requires kernel .config)' 1738 @echo ' dir/file.[os] - Build specified target only' 1739 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1740 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1741 @echo ' The output is not intended to be compilable.' 1742 @echo ' dir/file.ll - Build the LLVM assembly file' 1743 @echo '' 1744 @$(if $(dtstree), \ 1745 echo 'Devicetree:'; \ 1746 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1747 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1748 echo ' dt_binding_check - Validate device tree binding documents'; \ 1749 echo ' dtbs_check - Validate device tree source files';\ 1750 echo '') 1751 1752 @echo 'Userspace tools targets:' 1753 @echo ' use "make tools/help"' 1754 @echo ' or "cd tools; make help"' 1755 @echo '' 1756 @echo 'Kernel packaging:' 1757 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1758 @echo '' 1759 @echo 'Documentation targets:' 1760 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1761 @echo '' 1762 @echo 'Architecture specific targets ($(SRCARCH)):' 1763 @$(or $(archhelp),\ 1764 echo ' No architecture specific help defined for $(SRCARCH)') 1765 @echo '' 1766 @$(if $(boards), \ 1767 $(foreach b, $(boards), \ 1768 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1769 echo '') 1770 @$(if $(board-dirs), \ 1771 $(foreach b, $(board-dirs), \ 1772 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1773 printf " %-16s - Show all of the above\\n" help-boards; \ 1774 echo '') 1775 1776 @echo ' make V=n [targets] 1: verbose build' 1777 @echo ' 2: give reason for rebuild of target' 1778 @echo ' V=1 and V=2 can be combined with V=12' 1779 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1780 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1781 @echo ' (sparse by default)' 1782 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1783 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1784 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1785 @echo ' 1: warnings which may be relevant and do not occur too often' 1786 @echo ' 2: warnings which occur quite often but may still be relevant' 1787 @echo ' 3: more obscure warnings, can most likely be ignored' 1788 @echo ' e: warnings are being treated as errors' 1789 @echo ' Multiple levels can be combined with W=12 or W=123' 1790 @$(if $(dtstree), \ 1791 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1792 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1793 ) 1794 @echo '' 1795 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1796 @echo 'For further info see the ./README file' 1797 1798 1799help-board-dirs := $(addprefix help-,$(board-dirs)) 1800 1801help-boards: $(help-board-dirs) 1802 1803boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1804 1805$(help-board-dirs): help-%: 1806 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1807 @$(if $(boards-per-dir), \ 1808 $(foreach b, $(boards-per-dir), \ 1809 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1810 echo '') 1811 1812 1813# Documentation targets 1814# --------------------------------------------------------------------------- 1815DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1816 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1817PHONY += $(DOC_TARGETS) 1818$(DOC_TARGETS): 1819 $(Q)$(MAKE) $(build)=Documentation $@ 1820 1821 1822# Rust targets 1823# --------------------------------------------------------------------------- 1824 1825# "Is Rust available?" target 1826PHONY += rustavailable 1827rustavailable: 1828 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1829 1830# Documentation target 1831# 1832# Using the singular to avoid running afoul of `no-dot-config-targets`. 1833PHONY += rustdoc 1834rustdoc: prepare 1835 $(Q)$(MAKE) $(build)=rust $@ 1836 1837# Testing target 1838PHONY += rusttest 1839rusttest: prepare 1840 $(Q)$(MAKE) $(build)=rust $@ 1841 1842# Formatting targets 1843PHONY += rustfmt rustfmtcheck 1844 1845# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1846# 1847# We match using absolute paths since `find` does not resolve them 1848# when matching, which is a problem when e.g. `srctree` is `..`. 1849# We `grep` afterwards in order to remove the directory entry itself. 1850rustfmt: 1851 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1852 -o -path $(abs_srctree)/rust/alloc -prune \ 1853 -o -path $(abs_objtree)/rust/test -prune \ 1854 | grep -Fv $(abs_srctree)/rust/alloc \ 1855 | grep -Fv $(abs_objtree)/rust/test \ 1856 | grep -Fv generated \ 1857 | xargs $(RUSTFMT) $(rustfmt_flags) 1858 1859rustfmtcheck: rustfmt_flags = --check 1860rustfmtcheck: rustfmt 1861 1862# IDE support targets 1863PHONY += rust-analyzer 1864rust-analyzer: 1865 $(Q)$(MAKE) $(build)=rust $@ 1866 1867# Misc 1868# --------------------------------------------------------------------------- 1869 1870PHONY += misc-check 1871misc-check: 1872 $(Q)$(srctree)/scripts/misc-check 1873 1874all: misc-check 1875 1876PHONY += scripts_gdb 1877scripts_gdb: prepare0 1878 $(Q)$(MAKE) $(build)=scripts/gdb 1879 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1880 1881ifdef CONFIG_GDB_SCRIPTS 1882all: scripts_gdb 1883endif 1884 1885else # KBUILD_EXTMOD 1886 1887filechk_kernel.release = echo $(KERNELRELEASE) 1888 1889### 1890# External module support. 1891# When building external modules the kernel used as basis is considered 1892# read-only, and no consistency checks are made and the make 1893# system is not used on the basis kernel. If updates are required 1894# in the basis kernel ordinary make commands (without M=...) must be used. 1895 1896# We are always building only modules. 1897KBUILD_BUILTIN := 1898KBUILD_MODULES := 1 1899 1900build-dir := $(KBUILD_EXTMOD) 1901 1902compile_commands.json: $(extmod_prefix)compile_commands.json 1903PHONY += compile_commands.json 1904 1905clean-dirs := $(KBUILD_EXTMOD) 1906clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1907 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1908 1909PHONY += prepare 1910# now expand this into a simple variable to reduce the cost of shell evaluations 1911prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1912prepare: 1913 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1914 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1915 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1916 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1917 fi 1918 1919PHONY += help 1920help: 1921 @echo ' Building external modules.' 1922 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1923 @echo '' 1924 @echo ' modules - default target, build the module(s)' 1925 @echo ' modules_install - install the module' 1926 @echo ' clean - remove generated files in module directory only' 1927 @echo '' 1928 1929__external_modules_error: 1930 @echo >&2 '***' 1931 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1932 @echo >&2 '*** You cannot build or install external modules.' 1933 @echo >&2 '***' 1934 @false 1935 1936endif # KBUILD_EXTMOD 1937 1938# --------------------------------------------------------------------------- 1939# Modules 1940 1941PHONY += modules modules_install modules_prepare 1942 1943ifdef CONFIG_MODULES 1944 1945$(MODORDER): $(build-dir) 1946 @: 1947 1948# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1949# This is solely useful to speed up test compiles. 1950modules: modpost 1951ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1952 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1953endif 1954 1955PHONY += modules_check 1956modules_check: $(MODORDER) 1957 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1958 1959quiet_cmd_depmod = DEPMOD $(MODLIB) 1960 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1961 $(KERNELRELEASE) 1962 1963modules_install: 1964 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1965 $(call cmd,depmod) 1966 1967else # CONFIG_MODULES 1968 1969# Modules not configured 1970# --------------------------------------------------------------------------- 1971 1972PHONY += __external_modules_error 1973 1974modules modules_install: __external_modules_error 1975 @: 1976 1977KBUILD_MODULES := 1978 1979endif # CONFIG_MODULES 1980 1981PHONY += modpost 1982modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1983 $(if $(KBUILD_MODULES), modules_check) 1984 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1985 1986# Single targets 1987# --------------------------------------------------------------------------- 1988# To build individual files in subdirectories, you can do like this: 1989# 1990# make foo/bar/baz.s 1991# 1992# The supported suffixes for single-target are listed in 'single-targets' 1993# 1994# To build only under specific subdirectories, you can do like this: 1995# 1996# make foo/bar/baz/ 1997 1998ifdef single-build 1999 2000# .ko is special because modpost is needed 2001single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2002single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2003 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2004 2005$(single-ko): single_modules 2006 @: 2007$(single-no-ko): $(build-dir) 2008 @: 2009 2010# Remove MODORDER when done because it is not the real one. 2011PHONY += single_modules 2012single_modules: $(single-no-ko) modules_prepare 2013 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2014 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2015ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2016 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2017endif 2018 $(Q)rm -f $(MODORDER) 2019 2020single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2021 2022KBUILD_MODULES := 1 2023 2024endif 2025 2026# Preset locale variables to speed up the build process. Limit locale 2027# tweaks to this spot to avoid wrong language settings when running 2028# make menuconfig etc. 2029# Error messages still appears in the original language 2030PHONY += $(build-dir) 2031$(build-dir): prepare 2032 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2033 2034clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2035PHONY += $(clean-dirs) clean 2036$(clean-dirs): 2037 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2038 2039clean: $(clean-dirs) 2040 $(call cmd,rmfiles) 2041 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2042 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2043 -o -name '*.ko.*' \ 2044 -o -name '*.dtb' -o -name '*.dtbo' \ 2045 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2046 -o -name '*.dt.yaml' \ 2047 -o -name '*.dwo' -o -name '*.lst' \ 2048 -o -name '*.su' -o -name '*.mod' \ 2049 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2050 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2051 -o -name '*.asn1.[ch]' \ 2052 -o -name '*.symtypes' -o -name 'modules.order' \ 2053 -o -name '*.c.[012]*.*' \ 2054 -o -name '*.ll' \ 2055 -o -name '*.gcno' \ 2056 -o -name '*.*.symversions' \) -type f -print \ 2057 -o -name '.tmp_*' -print \ 2058 | xargs rm -rf 2059 2060# Generate tags for editors 2061# --------------------------------------------------------------------------- 2062quiet_cmd_tags = GEN $@ 2063 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2064 2065tags TAGS cscope gtags: FORCE 2066 $(call cmd,tags) 2067 2068# Script to generate missing namespace dependencies 2069# --------------------------------------------------------------------------- 2070 2071PHONY += nsdeps 2072nsdeps: export KBUILD_NSDEPS=1 2073nsdeps: modules 2074 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2075 2076# Clang Tooling 2077# --------------------------------------------------------------------------- 2078 2079quiet_cmd_gen_compile_commands = GEN $@ 2080 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2081 2082$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2083 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2084 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2085 $(call if_changed,gen_compile_commands) 2086 2087targets += $(extmod_prefix)compile_commands.json 2088 2089PHONY += clang-tidy clang-analyzer 2090 2091ifdef CONFIG_CC_IS_CLANG 2092quiet_cmd_clang_tools = CHECK $< 2093 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2094 2095clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2096 $(call cmd,clang_tools) 2097else 2098clang-tidy clang-analyzer: 2099 @echo "$@ requires CC=clang" >&2 2100 @false 2101endif 2102 2103# Scripts to check various things for consistency 2104# --------------------------------------------------------------------------- 2105 2106PHONY += includecheck versioncheck coccicheck export_report 2107 2108includecheck: 2109 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2110 -name '*.[hcS]' -type f -print | sort \ 2111 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2112 2113versioncheck: 2114 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2115 -name '*.[hcS]' -type f -print | sort \ 2116 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2117 2118coccicheck: 2119 $(Q)$(BASH) $(srctree)/scripts/$@ 2120 2121export_report: 2122 $(PERL) $(srctree)/scripts/export_report.pl 2123 2124PHONY += checkstack kernelrelease kernelversion image_name 2125 2126# UML needs a little special treatment here. It wants to use the host 2127# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2128# else wants $(ARCH), including people doing cross-builds, which means 2129# that $(SUBARCH) doesn't work here. 2130ifeq ($(ARCH), um) 2131CHECKSTACK_ARCH := $(SUBARCH) 2132else 2133CHECKSTACK_ARCH := $(ARCH) 2134endif 2135checkstack: 2136 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2137 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2138 2139kernelrelease: 2140 @$(filechk_kernel.release) 2141 2142kernelversion: 2143 @echo $(KERNELVERSION) 2144 2145image_name: 2146 @echo $(KBUILD_IMAGE) 2147 2148quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2149 cmd_rmfiles = rm -rf $(rm-files) 2150 2151# read saved command lines for existing targets 2152existing-targets := $(wildcard $(sort $(targets))) 2153 2154-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2155 2156endif # config-build 2157endif # mixed-build 2158endif # need-sub-make 2159 2160PHONY += FORCE 2161FORCE: 2162 2163# Declare the contents of the PHONY variable as phony. We keep that 2164# information in a variable so we can use it in if_changed and friends. 2165.PHONY: $(PHONY) 2166