1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Baby Opossum Posse 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 ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 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)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_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, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137$(if $(word 2, $(KBUILD_EXTMOD)), \ 138 $(error building multiple external modules is not supported)) 139 140$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 141 $(error module directory path cannot contain '$x'))) 142 143# Remove trailing slashes 144ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 145KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 146endif 147 148export KBUILD_EXTMOD 149 150# backward compatibility 151KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 152 153ifeq ("$(origin W)", "command line") 154 KBUILD_EXTRA_WARN := $(W) 155endif 156 157export KBUILD_EXTRA_WARN 158 159# Kbuild will save output files in the current working directory. 160# This does not need to match to the root of the kernel source tree. 161# 162# For example, you can do this: 163# 164# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165# 166# If you want to save output files in a different location, there are 167# two syntaxes to specify it. 168# 169# 1) O= 170# Use "make O=dir/to/store/output/files/" 171# 172# 2) Set KBUILD_OUTPUT 173# Set the environment variable KBUILD_OUTPUT to point to the output directory. 174# export KBUILD_OUTPUT=dir/to/store/output/files/; make 175# 176# The O= assignment takes precedence over the KBUILD_OUTPUT environment 177# variable. 178 179# Do we want to change the working directory? 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifneq ($(KBUILD_OUTPUT),) 185# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 186$(shell mkdir -p "$(KBUILD_OUTPUT)") 187# $(realpath ...) resolves symlinks 188abs_objtree := $(realpath $(KBUILD_OUTPUT)) 189$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 193$(error source directory cannot contain spaces or colons) 194endif 195 196export sub_make_done := 1 197 198endif # sub_make_done 199 200ifeq ($(abs_objtree),$(CURDIR)) 201# Suppress "Entering directory ..." if we are at the final work directory. 202no-print-directory := --no-print-directory 203else 204# Recursion to show "Entering directory ..." 205need-sub-make := 1 206endif 207 208ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 209# If --no-print-directory is unset, recurse once again to set it. 210# You may end up recursing into __sub-make twice. This is needed due to the 211# behavior change in GNU Make 4.4.1. 212need-sub-make := 1 213endif 214 215ifeq ($(need-sub-make),1) 216 217PHONY += $(MAKECMDGOALS) __sub-make 218 219$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 220 @: 221 222# Invoke a second make in the output directory, passing relevant variables 223__sub-make: 224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 226 227else # need-sub-make 228 229# We process the rest of the Makefile if this is the final invocation of make 230 231ifeq ($(abs_srctree),$(abs_objtree)) 232 # building in the source tree 233 srctree := . 234 building_out_of_srctree := 235else 236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 237 # building in a subdirectory of the source tree 238 srctree := .. 239 else 240 srctree := $(abs_srctree) 241 endif 242 building_out_of_srctree := 1 243endif 244 245ifneq ($(KBUILD_ABS_SRCTREE),) 246srctree := $(abs_srctree) 247endif 248 249objtree := . 250 251VPATH := 252 253ifeq ($(KBUILD_EXTMOD),) 254ifdef building_out_of_srctree 255VPATH := $(srctree) 256endif 257endif 258 259export building_out_of_srctree srctree objtree VPATH 260 261# To make sure we do not include .config for any of the *config targets 262# catch them early, and hand them over to scripts/kconfig/Makefile 263# It is allowed to specify more targets when calling make, including 264# mixing *config targets and build targets. 265# For example 'make oldconfig all'. 266# Detect when mixed targets is specified, and make a second invocation 267# of make so .config is not included in this case either (for *config). 268 269version_h := include/generated/uapi/linux/version.h 270 271clean-targets := %clean mrproper cleandocs 272no-dot-config-targets := $(clean-targets) \ 273 cscope gtags TAGS tags help% %docs check% coccicheck \ 274 $(version_h) headers headers_% archheaders archscripts \ 275 %asm-generic kernelversion %src-pkg dt_binding_check \ 276 outputmakefile rustavailable rustfmt rustfmtcheck 277no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 278 image_name 279single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 280 281config-build := 282mixed-build := 283need-config := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 may-sync-config := 296 endif 297endif 298 299need-compiler := $(may-sync-config) 300 301ifneq ($(KBUILD_EXTMOD),) 302 may-sync-config := 303endif 304 305ifeq ($(KBUILD_EXTMOD),) 306 ifneq ($(filter %config,$(MAKECMDGOALS)),) 307 config-build := 1 308 ifneq ($(words $(MAKECMDGOALS)),1) 309 mixed-build := 1 310 endif 311 endif 312endif 313 314# We cannot build single targets and the others at the same time 315ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 316 single-build := 1 317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 318 mixed-build := 1 319 endif 320endif 321 322# For "make -j clean all", "make -j mrproper defconfig all", etc. 323ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 325 mixed-build := 1 326 endif 327endif 328 329# install and modules_install need also be processed one by one 330ifneq ($(filter install,$(MAKECMDGOALS)),) 331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 332 mixed-build := 1 333 endif 334endif 335 336ifdef mixed-build 337# =========================================================================== 338# We're called with mixed targets (*config and build targets). 339# Handle them one by one. 340 341PHONY += $(MAKECMDGOALS) __build_one_by_one 342 343$(MAKECMDGOALS): __build_one_by_one 344 @: 345 346__build_one_by_one: 347 $(Q)set -e; \ 348 for i in $(MAKECMDGOALS); do \ 349 $(MAKE) -f $(srctree)/Makefile $$i; \ 350 done 351 352else # !mixed-build 353 354include $(srctree)/scripts/Kbuild.include 355 356# Read KERNELRELEASE from include/config/kernel.release (if it exists) 357KERNELRELEASE = $(call read-file, include/config/kernel.release) 358KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 359export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 360 361include $(srctree)/scripts/subarch.include 362 363# Cross compiling and selecting different set of gcc/bin-utils 364# --------------------------------------------------------------------------- 365# 366# When performing cross compilation for other architectures ARCH shall be set 367# to the target architecture. (See arch/* for the possibilities). 368# ARCH can be set during invocation of make: 369# make ARCH=arm64 370# Another way is to have ARCH set in the environment. 371# The default ARCH is the host where make is executed. 372 373# CROSS_COMPILE specify the prefix used for all executables used 374# during compilation. Only gcc and related bin-utils executables 375# are prefixed with $(CROSS_COMPILE). 376# CROSS_COMPILE can be set on the command line 377# make CROSS_COMPILE=aarch64-linux-gnu- 378# Alternatively CROSS_COMPILE can be set in the environment. 379# Default value for CROSS_COMPILE is not to prefix executables 380# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 381ARCH ?= $(SUBARCH) 382 383# Architecture as present in compile.h 384UTS_MACHINE := $(ARCH) 385SRCARCH := $(ARCH) 386 387# Additional ARCH settings for x86 388ifeq ($(ARCH),i386) 389 SRCARCH := x86 390endif 391ifeq ($(ARCH),x86_64) 392 SRCARCH := x86 393endif 394 395# Additional ARCH settings for sparc 396ifeq ($(ARCH),sparc32) 397 SRCARCH := sparc 398endif 399ifeq ($(ARCH),sparc64) 400 SRCARCH := sparc 401endif 402 403# Additional ARCH settings for parisc 404ifeq ($(ARCH),parisc64) 405 SRCARCH := parisc 406endif 407 408export cross_compiling := 409ifneq ($(SRCARCH),$(SUBARCH)) 410cross_compiling := 1 411endif 412 413KCONFIG_CONFIG ?= .config 414export KCONFIG_CONFIG 415 416# SHELL used by kbuild 417CONFIG_SHELL := sh 418 419HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 420HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 421HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 422 423ifneq ($(LLVM),) 424ifneq ($(filter %/,$(LLVM)),) 425LLVM_PREFIX := $(LLVM) 426else ifneq ($(filter -%,$(LLVM)),) 427LLVM_SUFFIX := $(LLVM) 428endif 429 430HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 431HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 432else 433HOSTCC = gcc 434HOSTCXX = g++ 435endif 436HOSTRUSTC = rustc 437HOSTPKG_CONFIG = pkg-config 438 439KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 440 -O2 -fomit-frame-pointer -std=gnu11 441KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 442KBUILD_USERLDFLAGS := $(USERLDFLAGS) 443 444# These flags apply to all Rust code in the tree, including the kernel and 445# host programs. 446export rust_common_flags := --edition=2021 \ 447 -Zbinary_dep_depinfo=y \ 448 -Astable_features \ 449 -Dnon_ascii_idents \ 450 -Dunsafe_op_in_unsafe_fn \ 451 -Wmissing_docs \ 452 -Wrust_2018_idioms \ 453 -Wunreachable_pub \ 454 -Wclippy::all \ 455 -Wclippy::ignored_unit_patterns \ 456 -Wclippy::mut_mut \ 457 -Wclippy::needless_bitwise_bool \ 458 -Wclippy::needless_continue \ 459 -Wclippy::no_mangle_with_rust_abi \ 460 -Wclippy::undocumented_unsafe_blocks \ 461 -Wclippy::unnecessary_safety_comment \ 462 -Wclippy::unnecessary_safety_doc \ 463 -Wrustdoc::missing_crate_level_docs \ 464 -Wrustdoc::unescaped_backticks 465 466KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 467 $(HOSTCFLAGS) -I $(srctree)/scripts/include 468KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 469 -I $(srctree)/scripts/include 470KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 471 -Zallow-features= $(HOSTRUSTFLAGS) 472KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 473KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 474 475# Make variables (CC, etc...) 476CPP = $(CC) -E 477ifneq ($(LLVM),) 478CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 479LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 480AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 481NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 482OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 483OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 484READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 485STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 486else 487CC = $(CROSS_COMPILE)gcc 488LD = $(CROSS_COMPILE)ld 489AR = $(CROSS_COMPILE)ar 490NM = $(CROSS_COMPILE)nm 491OBJCOPY = $(CROSS_COMPILE)objcopy 492OBJDUMP = $(CROSS_COMPILE)objdump 493READELF = $(CROSS_COMPILE)readelf 494STRIP = $(CROSS_COMPILE)strip 495endif 496RUSTC = rustc 497RUSTDOC = rustdoc 498RUSTFMT = rustfmt 499CLIPPY_DRIVER = clippy-driver 500BINDGEN = bindgen 501PAHOLE = pahole 502RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 503LEX = flex 504YACC = bison 505AWK = awk 506INSTALLKERNEL := installkernel 507PERL = perl 508PYTHON3 = python3 509CHECK = sparse 510BASH = bash 511KGZIP = gzip 512KBZIP2 = bzip2 513KLZOP = lzop 514LZMA = lzma 515LZ4 = lz4c 516XZ = xz 517ZSTD = zstd 518 519CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 520 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 521NOSTDINC_FLAGS := 522CFLAGS_MODULE = 523RUSTFLAGS_MODULE = 524AFLAGS_MODULE = 525LDFLAGS_MODULE = 526CFLAGS_KERNEL = 527RUSTFLAGS_KERNEL = 528AFLAGS_KERNEL = 529LDFLAGS_vmlinux = 530 531# Use USERINCLUDE when you must reference the UAPI directories only. 532USERINCLUDE := \ 533 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 534 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 535 -I$(srctree)/include/uapi \ 536 -I$(objtree)/include/generated/uapi \ 537 -include $(srctree)/include/linux/compiler-version.h \ 538 -include $(srctree)/include/linux/kconfig.h 539 540# Use LINUXINCLUDE when you must reference the include/ directory. 541# Needed to be compatible with the O= option 542LINUXINCLUDE := \ 543 -I$(srctree)/arch/$(SRCARCH)/include \ 544 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 545 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 546 -I$(objtree)/include \ 547 $(USERINCLUDE) 548 549KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 550 551KBUILD_CFLAGS := 552KBUILD_CFLAGS += -std=gnu11 553KBUILD_CFLAGS += -fshort-wchar 554KBUILD_CFLAGS += -funsigned-char 555KBUILD_CFLAGS += -fno-common 556KBUILD_CFLAGS += -fno-PIE 557KBUILD_CFLAGS += -fno-strict-aliasing 558 559KBUILD_CPPFLAGS := -D__KERNEL__ 560KBUILD_RUSTFLAGS := $(rust_common_flags) \ 561 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 562 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 563 -Csymbol-mangling-version=v0 \ 564 -Crelocation-model=static \ 565 -Zfunction-sections=n \ 566 -Wclippy::float_arithmetic 567 568KBUILD_AFLAGS_KERNEL := 569KBUILD_CFLAGS_KERNEL := 570KBUILD_RUSTFLAGS_KERNEL := 571KBUILD_AFLAGS_MODULE := -DMODULE 572KBUILD_CFLAGS_MODULE := -DMODULE 573KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 574KBUILD_LDFLAGS_MODULE := 575KBUILD_LDFLAGS := 576CLANG_FLAGS := 577 578ifeq ($(KBUILD_CLIPPY),1) 579 RUSTC_OR_CLIPPY_QUIET := CLIPPY 580 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 581else 582 RUSTC_OR_CLIPPY_QUIET := RUSTC 583 RUSTC_OR_CLIPPY = $(RUSTC) 584endif 585 586# Allows the usage of unstable features in stable compilers. 587export RUSTC_BOOTSTRAP := 1 588 589# Allows finding `.clippy.toml` in out-of-srctree builds. 590export CLIPPY_CONF_DIR := $(srctree) 591 592export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 593export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 594export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 595export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 596export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 597export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 598export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 599export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 600 601export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 602export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 603export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 604export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 605export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 606export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 607 608# Files to ignore in find ... statements 609 610export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 611 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 612 -prune -o 613 614# =========================================================================== 615# Rules shared between *config targets and build targets 616 617# Basic helpers built in scripts/basic/ 618PHONY += scripts_basic 619scripts_basic: 620 $(Q)$(MAKE) $(build)=scripts/basic 621 622PHONY += outputmakefile 623ifdef building_out_of_srctree 624# Before starting out-of-tree build, make sure the source tree is clean. 625# outputmakefile generates a Makefile in the output directory, if using a 626# separate output directory. This allows convenient use of make in the 627# output directory. 628# At the same time when output Makefile generated, generate .gitignore to 629# ignore whole output directory 630 631quiet_cmd_makefile = GEN Makefile 632 cmd_makefile = { \ 633 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 634 echo "include $(srctree)/Makefile"; \ 635 } > Makefile 636 637outputmakefile: 638 @if [ -f $(srctree)/.config -o \ 639 -d $(srctree)/include/config -o \ 640 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 641 echo >&2 "***"; \ 642 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 643 echo >&2 "*** in $(abs_srctree)";\ 644 echo >&2 "***"; \ 645 false; \ 646 fi 647 $(Q)ln -fsn $(srctree) source 648 $(call cmd,makefile) 649 $(Q)test -e .gitignore || \ 650 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 651endif 652 653# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 654# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 655# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 656# need export), and from include/config/auto.conf.cmd to detect the compiler 657# upgrade. 658CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 659RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 660 661ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 662include $(srctree)/scripts/Makefile.clang 663endif 664 665# Include this also for config targets because some architectures need 666# cc-cross-prefix to determine CROSS_COMPILE. 667ifdef need-compiler 668include $(srctree)/scripts/Makefile.compiler 669endif 670 671ifdef config-build 672# =========================================================================== 673# *config targets only - make sure prerequisites are updated, and descend 674# in scripts/kconfig to make the *config target 675 676# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 677# KBUILD_DEFCONFIG may point out an alternative default configuration 678# used for 'make defconfig' 679include $(srctree)/arch/$(SRCARCH)/Makefile 680export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 681 682config: outputmakefile scripts_basic FORCE 683 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 684 685%config: outputmakefile scripts_basic FORCE 686 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 687 688else #!config-build 689# =========================================================================== 690# Build targets only - this includes vmlinux, arch-specific targets, clean 691# targets and others. In general all targets except *config targets. 692 693# If building an external module we do not care about the all: rule 694# but instead __all depend on modules 695PHONY += all 696ifeq ($(KBUILD_EXTMOD),) 697__all: all 698else 699__all: modules 700endif 701 702targets := 703 704# Decide whether to build built-in, modular, or both. 705# Normally, just do built-in. 706 707KBUILD_MODULES := 708KBUILD_BUILTIN := 1 709 710# If we have only "make modules", don't compile built-in objects. 711ifeq ($(MAKECMDGOALS),modules) 712 KBUILD_BUILTIN := 713endif 714 715# If we have "make <whatever> modules", compile modules 716# in addition to whatever we do anyway. 717# Just "make" or "make all" shall build modules as well 718 719ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 720 KBUILD_MODULES := 1 721endif 722 723ifeq ($(MAKECMDGOALS),) 724 KBUILD_MODULES := 1 725endif 726 727export KBUILD_MODULES KBUILD_BUILTIN 728 729ifdef need-config 730include include/config/auto.conf 731endif 732 733ifeq ($(KBUILD_EXTMOD),) 734# Objects we will link into vmlinux / subdirs we need to visit 735core-y := 736drivers-y := 737libs-y := lib/ 738endif # KBUILD_EXTMOD 739 740# The all: target is the default when no target is given on the 741# command line. 742# This allow a user to issue only 'make' to build a kernel including modules 743# Defaults to vmlinux, but the arch makefile usually adds further targets 744all: vmlinux 745 746CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 747ifdef CONFIG_CC_IS_GCC 748CFLAGS_GCOV += -fno-tree-loop-im 749endif 750export CFLAGS_GCOV 751 752# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 753ifdef CONFIG_FUNCTION_TRACER 754 CC_FLAGS_FTRACE := -pg 755endif 756 757include $(srctree)/arch/$(SRCARCH)/Makefile 758 759ifdef need-config 760ifdef may-sync-config 761# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 762# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 763# because some architectures define CROSS_COMPILE there. 764include include/config/auto.conf.cmd 765 766$(KCONFIG_CONFIG): 767 @echo >&2 '***' 768 @echo >&2 '*** Configuration file "$@" not found!' 769 @echo >&2 '***' 770 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 771 @echo >&2 '*** "make menuconfig" or "make xconfig").' 772 @echo >&2 '***' 773 @/bin/false 774 775# The actual configuration files used during the build are stored in 776# include/generated/ and include/config/. Update them if .config is newer than 777# include/config/auto.conf (which mirrors .config). 778# 779# This exploits the 'multi-target pattern rule' trick. 780# The syncconfig should be executed only once to make all the targets. 781# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 782# 783# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 784# so you cannot notice that Kconfig is waiting for the user input. 785%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 786 $(Q)$(kecho) " SYNC $@" 787 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 788else # !may-sync-config 789# External modules and some install targets need include/generated/autoconf.h 790# and include/config/auto.conf but do not care if they are up-to-date. 791# Use auto.conf to trigger the test 792PHONY += include/config/auto.conf 793 794include/config/auto.conf: 795 @test -e include/generated/autoconf.h -a -e $@ || ( \ 796 echo >&2; \ 797 echo >&2 " ERROR: Kernel configuration is invalid."; \ 798 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 799 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 800 echo >&2 ; \ 801 /bin/false) 802 803endif # may-sync-config 804endif # need-config 805 806KBUILD_CFLAGS += -fno-delete-null-pointer-checks 807 808ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 809KBUILD_CFLAGS += -O2 810KBUILD_RUSTFLAGS += -Copt-level=2 811else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 812KBUILD_CFLAGS += -Os 813KBUILD_RUSTFLAGS += -Copt-level=s 814endif 815 816# Always set `debug-assertions` and `overflow-checks` because their default 817# depends on `opt-level` and `debug-assertions`, respectively. 818KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 819KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 820 821# Tell gcc to never replace conditional load with a non-conditional one 822ifdef CONFIG_CC_IS_GCC 823# gcc-10 renamed --param=allow-store-data-races=0 to 824# -fno-allow-store-data-races. 825KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 826KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 827endif 828 829ifdef CONFIG_READABLE_ASM 830# Disable optimizations that make assembler listings hard to read. 831# reorder blocks reorders the control in the function 832# ipa clone creates specialized cloned functions 833# partial inlining inlines only parts of functions 834KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 835endif 836 837stackp-flags-y := -fno-stack-protector 838stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 839stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 840 841KBUILD_CFLAGS += $(stackp-flags-y) 842 843KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 844KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 845 846ifdef CONFIG_FRAME_POINTER 847KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 848KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 849else 850# Some targets (ARM with Thumb2, for example), can't be built with frame 851# pointers. For those, we don't have FUNCTION_TRACER automatically 852# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 853# incompatible with -fomit-frame-pointer with current GCC, so we don't use 854# -fomit-frame-pointer with FUNCTION_TRACER. 855# In the Rust target specification, "frame-pointer" is set explicitly 856# to "may-omit". 857ifndef CONFIG_FUNCTION_TRACER 858KBUILD_CFLAGS += -fomit-frame-pointer 859endif 860endif 861 862# Initialize all stack variables with a 0xAA pattern. 863ifdef CONFIG_INIT_STACK_ALL_PATTERN 864KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 865endif 866 867# Initialize all stack variables with a zero value. 868ifdef CONFIG_INIT_STACK_ALL_ZERO 869KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 870ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 871# https://github.com/llvm/llvm-project/issues/44842 872CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 873export CC_AUTO_VAR_INIT_ZERO_ENABLER 874KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 875endif 876endif 877 878# While VLAs have been removed, GCC produces unreachable stack probes 879# for the randomize_kstack_offset feature. Disable it for all compilers. 880KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 881 882# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 883ifdef CONFIG_ZERO_CALL_USED_REGS 884KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 885endif 886 887ifdef CONFIG_FUNCTION_TRACER 888ifdef CONFIG_FTRACE_MCOUNT_USE_CC 889 CC_FLAGS_FTRACE += -mrecord-mcount 890 ifdef CONFIG_HAVE_NOP_MCOUNT 891 ifeq ($(call cc-option-yn, -mnop-mcount),y) 892 CC_FLAGS_FTRACE += -mnop-mcount 893 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 894 endif 895 endif 896endif 897ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 898 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 899 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 900 endif 901endif 902ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 903 ifdef CONFIG_HAVE_C_RECORDMCOUNT 904 BUILD_C_RECORDMCOUNT := y 905 export BUILD_C_RECORDMCOUNT 906 endif 907endif 908ifdef CONFIG_HAVE_FENTRY 909 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 910 ifeq ($(call cc-option-yn, -mfentry),y) 911 CC_FLAGS_FTRACE += -mfentry 912 CC_FLAGS_USING += -DCC_USING_FENTRY 913 endif 914endif 915export CC_FLAGS_FTRACE 916KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 917KBUILD_AFLAGS += $(CC_FLAGS_USING) 918endif 919 920# We trigger additional mismatches with less inlining 921ifdef CONFIG_DEBUG_SECTION_MISMATCH 922KBUILD_CFLAGS += -fno-inline-functions-called-once 923endif 924 925# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 926ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 927KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 928KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 929LDFLAGS_vmlinux += --gc-sections 930endif 931 932ifdef CONFIG_SHADOW_CALL_STACK 933ifndef CONFIG_DYNAMIC_SCS 934CC_FLAGS_SCS := -fsanitize=shadow-call-stack 935KBUILD_CFLAGS += $(CC_FLAGS_SCS) 936KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 937endif 938export CC_FLAGS_SCS 939endif 940 941ifdef CONFIG_LTO_CLANG 942ifdef CONFIG_LTO_CLANG_THIN 943CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 944else 945CC_FLAGS_LTO := -flto 946endif 947CC_FLAGS_LTO += -fvisibility=hidden 948 949# Limit inlining across translation units to reduce binary size 950KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 951endif 952 953ifdef CONFIG_LTO 954KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 955KBUILD_AFLAGS += -fno-lto 956export CC_FLAGS_LTO 957endif 958 959ifdef CONFIG_CFI_CLANG 960CC_FLAGS_CFI := -fsanitize=kcfi 961ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 962 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 963endif 964ifdef CONFIG_RUST 965 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 966 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 967 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 968 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 969 export RUSTC_FLAGS_CFI 970endif 971KBUILD_CFLAGS += $(CC_FLAGS_CFI) 972export CC_FLAGS_CFI 973endif 974 975# Architectures can define flags to add/remove for floating-point support 976CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 977export CC_FLAGS_FPU 978export CC_FLAGS_NO_FPU 979 980ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 981# Set the minimal function alignment. Use the newer GCC option 982# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 983# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 984ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 985KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 986else 987KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 988endif 989endif 990 991# arch Makefile may override CC so keep this after arch Makefile is included 992NOSTDINC_FLAGS += -nostdinc 993 994# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 995# the kernel uses only C99 flexible arrays for dynamically sized trailing 996# arrays. Enforce this for everything that may examine structure sizes and 997# perform bounds checking. 998KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 999 1000#Currently, disable -Wstringop-overflow for GCC 11, globally. 1001KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1002KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1003 1004# disable invalid "can't wrap" optimizations for signed / pointers 1005KBUILD_CFLAGS += -fno-strict-overflow 1006 1007# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1008KBUILD_CFLAGS += -fno-stack-check 1009 1010# conserve stack if available 1011ifdef CONFIG_CC_IS_GCC 1012KBUILD_CFLAGS += -fconserve-stack 1013endif 1014 1015# change __FILE__ to the relative path from the srctree 1016KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1017 1018# include additional Makefiles when needed 1019include-y := scripts/Makefile.extrawarn 1020include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1021include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1022include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1023include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1024include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1025include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1026include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1027include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1028include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1029 1030include $(addprefix $(srctree)/, $(include-y)) 1031 1032# scripts/Makefile.gcc-plugins is intentionally included last. 1033# Do not add $(call cc-option,...) below this line. When you build the kernel 1034# from the clean source tree, the GCC plugins do not exist at this point. 1035 1036# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1037KBUILD_CPPFLAGS += $(KCPPFLAGS) 1038KBUILD_AFLAGS += $(KAFLAGS) 1039KBUILD_CFLAGS += $(KCFLAGS) 1040KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1041 1042KBUILD_LDFLAGS_MODULE += --build-id=sha1 1043LDFLAGS_vmlinux += --build-id=sha1 1044 1045KBUILD_LDFLAGS += -z noexecstack 1046ifeq ($(CONFIG_LD_IS_BFD),y) 1047KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1048endif 1049 1050ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1051LDFLAGS_vmlinux += -X 1052endif 1053 1054ifeq ($(CONFIG_RELR),y) 1055# ld.lld before 15 did not support -z pack-relative-relocs. 1056LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1057endif 1058 1059# We never want expected sections to be placed heuristically by the 1060# linker. All sections should be explicitly named in the linker script. 1061ifdef CONFIG_LD_ORPHAN_WARN 1062LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1063endif 1064 1065# Align the bit size of userspace programs with the kernel 1066KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1067KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1068 1069# make the checker run with the right architecture 1070CHECKFLAGS += --arch=$(ARCH) 1071 1072# insure the checker run with the right endianness 1073CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1074 1075# the checker needs the correct machine size 1076CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1077 1078# Default kernel image to build when no specific target is given. 1079# KBUILD_IMAGE may be overruled on the command line or 1080# set in the environment 1081# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1082# this default value 1083export KBUILD_IMAGE ?= vmlinux 1084 1085# 1086# INSTALL_PATH specifies where to place the updated kernel and system map 1087# images. Default is /boot, but you can set it to other values 1088export INSTALL_PATH ?= /boot 1089 1090# 1091# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1092# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1093# an argument if needed. Otherwise it defaults to the kernel install path 1094# 1095export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1096 1097# 1098# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1099# relocations required by build roots. This is not defined in the 1100# makefile but the argument can be passed to make if needed. 1101# 1102 1103MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1104export MODLIB 1105 1106PHONY += prepare0 1107 1108export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1109export MODORDER := $(extmod_prefix)modules.order 1110export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1111 1112ifeq ($(KBUILD_EXTMOD),) 1113 1114build-dir := . 1115clean-dirs := $(sort . Documentation \ 1116 $(patsubst %/,%,$(filter %/, $(core-) \ 1117 $(drivers-) $(libs-)))) 1118 1119export ARCH_CORE := $(core-y) 1120export ARCH_LIB := $(filter %/, $(libs-y)) 1121export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1122# Externally visible symbols (used by link-vmlinux.sh) 1123 1124KBUILD_VMLINUX_OBJS := ./built-in.a 1125ifdef CONFIG_MODULES 1126KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1127KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1128else 1129KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1130endif 1131 1132export KBUILD_VMLINUX_LIBS 1133export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1134 1135ifdef CONFIG_TRIM_UNUSED_KSYMS 1136# For the kernel to actually contain only the needed exported symbols, 1137# we have to build modules as well to determine what those symbols are. 1138KBUILD_MODULES := 1 1139endif 1140 1141# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1142quiet_cmd_ar_vmlinux.a = AR $@ 1143 cmd_ar_vmlinux.a = \ 1144 rm -f $@; \ 1145 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1146 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1147 1148targets += vmlinux.a 1149vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1150 $(call if_changed,ar_vmlinux.a) 1151 1152PHONY += vmlinux_o 1153vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1154 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1155 1156vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1157 @: 1158 1159PHONY += vmlinux 1160# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1161# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1162# unrelated; the decompressors just happen to have the same base name, 1163# arch/*/boot/compressed/vmlinux. 1164# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1165# 1166# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1167# https://savannah.gnu.org/bugs/?61463 1168# For Make > 4.4, the following simple code will work: 1169# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1170vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1171vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1172vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1173 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1174 1175# The actual objects are generated when descending, 1176# make sure no implicit rule kicks in 1177$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1178 1179ifeq ($(origin KERNELRELEASE),file) 1180filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1181else 1182filechk_kernel.release = echo $(KERNELRELEASE) 1183endif 1184 1185# Store (new) KERNELRELEASE string in include/config/kernel.release 1186include/config/kernel.release: FORCE 1187 $(call filechk,kernel.release) 1188 1189# Additional helpers built in scripts/ 1190# Carefully list dependencies so we do not try to build scripts twice 1191# in parallel 1192PHONY += scripts 1193scripts: scripts_basic scripts_dtc 1194 $(Q)$(MAKE) $(build)=$(@) 1195 1196# Things we need to do before we recursively start building the kernel 1197# or the modules are listed in "prepare". 1198# A multi level approach is used. prepareN is processed before prepareN-1. 1199# archprepare is used in arch Makefiles and when processed asm symlink, 1200# version.h and scripts_basic is processed / created. 1201 1202PHONY += prepare archprepare 1203 1204archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1205 asm-generic $(version_h) include/generated/utsrelease.h \ 1206 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1207 1208prepare0: archprepare 1209 $(Q)$(MAKE) $(build)=scripts/mod 1210 $(Q)$(MAKE) $(build)=. prepare 1211 1212# All the preparing.. 1213prepare: prepare0 1214ifdef CONFIG_RUST 1215 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1216 $(Q)$(MAKE) $(build)=rust 1217endif 1218 1219PHONY += remove-stale-files 1220remove-stale-files: 1221 $(Q)$(srctree)/scripts/remove-stale-files 1222 1223# Support for using generic headers in asm-generic 1224asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1225 1226PHONY += asm-generic uapi-asm-generic 1227asm-generic: uapi-asm-generic 1228 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1229 generic=include/asm-generic 1230uapi-asm-generic: 1231 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1232 generic=include/uapi/asm-generic 1233 1234# Generate some files 1235# --------------------------------------------------------------------------- 1236 1237# KERNELRELEASE can change from a few different places, meaning version.h 1238# needs to be updated, so this check is forced on all builds 1239 1240uts_len := 64 1241define filechk_utsrelease.h 1242 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1243 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1244 exit 1; \ 1245 fi; \ 1246 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1247endef 1248 1249define filechk_version.h 1250 if [ $(SUBLEVEL) -gt 255 ]; then \ 1251 echo \#define LINUX_VERSION_CODE $(shell \ 1252 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1253 else \ 1254 echo \#define LINUX_VERSION_CODE $(shell \ 1255 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1256 fi; \ 1257 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1258 ((c) > 255 ? 255 : (c)))'; \ 1259 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1260 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1261 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1262endef 1263 1264$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1265$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1266$(version_h): FORCE 1267 $(call filechk,version.h) 1268 1269include/generated/utsrelease.h: include/config/kernel.release FORCE 1270 $(call filechk,utsrelease.h) 1271 1272filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1273 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1274 1275include/generated/compile.h: FORCE 1276 $(call filechk,compile.h) 1277 1278PHONY += headerdep 1279headerdep: 1280 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1281 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1282 1283# --------------------------------------------------------------------------- 1284# Kernel headers 1285 1286#Default location for installed headers 1287export INSTALL_HDR_PATH = $(objtree)/usr 1288 1289quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1290 cmd_headers_install = \ 1291 mkdir -p $(INSTALL_HDR_PATH); \ 1292 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1293 usr/include $(INSTALL_HDR_PATH) 1294 1295PHONY += headers_install 1296headers_install: headers 1297 $(call cmd,headers_install) 1298 1299PHONY += archheaders archscripts 1300 1301hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1302 1303PHONY += headers 1304headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1305 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1306 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1307 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1308 1309ifdef CONFIG_HEADERS_INSTALL 1310prepare: headers 1311endif 1312 1313PHONY += scripts_unifdef 1314scripts_unifdef: scripts_basic 1315 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1316 1317# --------------------------------------------------------------------------- 1318# Install 1319 1320# Many distributions have the custom install script, /sbin/installkernel. 1321# If DKMS is installed, 'make install' will eventually recurse back 1322# to this Makefile to build and install external modules. 1323# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1324 1325quiet_cmd_install = INSTALL $(INSTALL_PATH) 1326 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1327 1328# --------------------------------------------------------------------------- 1329# vDSO install 1330 1331PHONY += vdso_install 1332vdso_install: export INSTALL_FILES = $(vdso-install-y) 1333vdso_install: 1334 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1335 1336# --------------------------------------------------------------------------- 1337# Tools 1338 1339ifdef CONFIG_OBJTOOL 1340prepare: tools/objtool 1341endif 1342 1343ifdef CONFIG_BPF 1344ifdef CONFIG_DEBUG_INFO_BTF 1345prepare: tools/bpf/resolve_btfids 1346endif 1347endif 1348 1349# The tools build system is not a part of Kbuild and tends to introduce 1350# its own unique issues. If you need to integrate a new tool into Kbuild, 1351# please consider locating that tool outside the tools/ tree and using the 1352# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1353# here. See Documentation/kbuild/makefiles.rst for details. 1354 1355PHONY += resolve_btfids_clean 1356 1357resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1358 1359# tools/bpf/resolve_btfids directory might not exist 1360# in output directory, skip its clean in that case 1361resolve_btfids_clean: 1362ifneq ($(wildcard $(resolve_btfids_O)),) 1363 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1364endif 1365 1366# Clear a bunch of variables before executing the submake 1367ifeq ($(quiet),silent_) 1368tools_silent=s 1369endif 1370 1371tools/: FORCE 1372 $(Q)mkdir -p $(objtree)/tools 1373 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1374 1375tools/%: FORCE 1376 $(Q)mkdir -p $(objtree)/tools 1377 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1378 1379# --------------------------------------------------------------------------- 1380# Kernel selftest 1381 1382PHONY += kselftest 1383kselftest: headers 1384 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1385 1386kselftest-%: headers FORCE 1387 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1388 1389PHONY += kselftest-merge 1390kselftest-merge: 1391 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1392 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1393 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1394 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1395 1396# --------------------------------------------------------------------------- 1397# Devicetree files 1398 1399ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1400dtstree := arch/$(SRCARCH)/boot/dts 1401endif 1402 1403ifneq ($(dtstree),) 1404 1405%.dtb: dtbs_prepare 1406 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1407 1408%.dtbo: dtbs_prepare 1409 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1410 1411PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1412dtbs: dtbs_prepare 1413 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1414 1415# include/config/kernel.release is actually needed when installing DTBs because 1416# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1417# dtbs_install depend on it as dtbs_install may run as root. 1418dtbs_prepare: include/config/kernel.release scripts_dtc 1419 1420ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1421export CHECK_DTBS=y 1422endif 1423 1424ifneq ($(CHECK_DTBS),) 1425dtbs_prepare: dt_binding_schemas 1426endif 1427 1428dtbs_check: dtbs 1429 1430dtbs_install: 1431 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1432 1433ifdef CONFIG_OF_EARLY_FLATTREE 1434all: dtbs 1435endif 1436 1437endif 1438 1439PHONY += scripts_dtc 1440scripts_dtc: scripts_basic 1441 $(Q)$(MAKE) $(build)=scripts/dtc 1442 1443ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1444export CHECK_DTBS=y 1445endif 1446 1447PHONY += dt_binding_check dt_binding_schemas 1448dt_binding_check: dt_binding_schemas scripts_dtc 1449 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1450 1451dt_binding_schemas: 1452 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1453 1454PHONY += dt_compatible_check 1455dt_compatible_check: dt_binding_schemas 1456 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1457 1458# --------------------------------------------------------------------------- 1459# Modules 1460 1461ifdef CONFIG_MODULES 1462 1463# By default, build modules as well 1464 1465all: modules 1466 1467# When we're building modules with modversions, we need to consider 1468# the built-in objects during the descend as well, in order to 1469# make sure the checksums are up to date before we record them. 1470ifdef CONFIG_MODVERSIONS 1471 KBUILD_BUILTIN := 1 1472endif 1473 1474# Build modules 1475# 1476 1477# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1478# is an exception. 1479ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1480KBUILD_BUILTIN := 1 1481modules: vmlinux 1482endif 1483 1484modules: modules_prepare 1485 1486# Target to prepare building external modules 1487modules_prepare: prepare 1488 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1489 1490endif # CONFIG_MODULES 1491 1492### 1493# Cleaning is done on three levels. 1494# make clean Delete most generated files 1495# Leave enough to build external modules 1496# make mrproper Delete the current configuration, and all generated files 1497# make distclean Remove editor backup files, patch leftover files and the like 1498 1499# Directories & files removed with 'make clean' 1500CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1501 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1502 modules.builtin.ranges vmlinux.o.map \ 1503 compile_commands.json rust/test \ 1504 rust-project.json .vmlinux.objs .vmlinux.export.c 1505 1506# Directories & files removed with 'make mrproper' 1507MRPROPER_FILES += include/config include/generated \ 1508 arch/$(SRCARCH)/include/generated .objdiff \ 1509 debian snap tar-install PKGBUILD pacman \ 1510 .config .config.old .version \ 1511 Module.symvers \ 1512 certs/signing_key.pem \ 1513 certs/x509.genkey \ 1514 vmlinux-gdb.py \ 1515 rpmbuild \ 1516 rust/libmacros.so 1517 1518# clean - Delete most, but leave enough to build external modules 1519# 1520clean: private rm-files := $(CLEAN_FILES) 1521 1522PHONY += archclean vmlinuxclean 1523 1524vmlinuxclean: 1525 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1526 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1527 1528clean: archclean vmlinuxclean resolve_btfids_clean 1529 1530# mrproper - Delete all generated files, including .config 1531# 1532mrproper: private rm-files := $(MRPROPER_FILES) 1533mrproper-dirs := $(addprefix _mrproper_,scripts) 1534 1535PHONY += $(mrproper-dirs) mrproper 1536$(mrproper-dirs): 1537 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1538 1539mrproper: clean $(mrproper-dirs) 1540 $(call cmd,rmfiles) 1541 @find . $(RCS_FIND_IGNORE) \ 1542 \( -name '*.rmeta' \) \ 1543 -type f -print | xargs rm -f 1544 1545# distclean 1546# 1547PHONY += distclean 1548 1549distclean: mrproper 1550 @find . $(RCS_FIND_IGNORE) \ 1551 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1552 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1553 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1554 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1555 -type f -print | xargs rm -f 1556 1557 1558# Packaging of the kernel to various formats 1559# --------------------------------------------------------------------------- 1560 1561%src-pkg: FORCE 1562 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1563%pkg: include/config/kernel.release FORCE 1564 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1565 1566# Brief documentation of the typical targets used 1567# --------------------------------------------------------------------------- 1568 1569boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1570boards := $(sort $(notdir $(boards))) 1571board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1572board-dirs := $(sort $(notdir $(board-dirs:/=))) 1573 1574PHONY += help 1575help: 1576 @echo 'Cleaning targets:' 1577 @echo ' clean - Remove most generated files but keep the config and' 1578 @echo ' enough build support to build external modules' 1579 @echo ' mrproper - Remove all generated files + config + various backup files' 1580 @echo ' distclean - mrproper + remove editor backup and patch files' 1581 @echo '' 1582 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1583 @echo '' 1584 @echo 'Other generic targets:' 1585 @echo ' all - Build all targets marked with [*]' 1586 @echo '* vmlinux - Build the bare kernel' 1587 @echo '* modules - Build all modules' 1588 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1589 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1590 @echo ' dir/ - Build all files in dir and below' 1591 @echo ' dir/file.[ois] - Build specified target only' 1592 @echo ' dir/file.ll - Build the LLVM assembly file' 1593 @echo ' (requires compiler support for LLVM assembly generation)' 1594 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1595 @echo ' (requires a recent binutils and recent build (System.map))' 1596 @echo ' dir/file.ko - Build module including final link' 1597 @echo ' modules_prepare - Set up for building external modules' 1598 @echo ' tags/TAGS - Generate tags file for editors' 1599 @echo ' cscope - Generate cscope index' 1600 @echo ' gtags - Generate GNU GLOBAL index' 1601 @echo ' kernelrelease - Output the release version string (use with make -s)' 1602 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1603 @echo ' image_name - Output the image name (use with make -s)' 1604 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1605 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1606 echo '' 1607 @echo 'Static analysers:' 1608 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1609 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1610 @echo ' versioncheck - Sanity check on version.h usage' 1611 @echo ' includecheck - Check for duplicate included header files' 1612 @echo ' export_report - List the usages of all exported symbols' 1613 @echo ' headerdep - Detect inclusion cycles in headers' 1614 @echo ' coccicheck - Check with Coccinelle' 1615 @echo ' clang-analyzer - Check with clang static analyzer' 1616 @echo ' clang-tidy - Check with clang-tidy' 1617 @echo '' 1618 @echo 'Tools:' 1619 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1620 @echo '' 1621 @echo 'Kernel selftest:' 1622 @echo ' kselftest - Build and run kernel selftest' 1623 @echo ' Build, install, and boot kernel before' 1624 @echo ' running kselftest on it' 1625 @echo ' Run as root for full coverage' 1626 @echo ' kselftest-all - Build kernel selftest' 1627 @echo ' kselftest-install - Build and install kernel selftest' 1628 @echo ' kselftest-clean - Remove all generated kselftest files' 1629 @echo ' kselftest-merge - Merge all the config dependencies of' 1630 @echo ' kselftest to existing .config.' 1631 @echo '' 1632 @echo 'Rust targets:' 1633 @echo ' rustavailable - Checks whether the Rust toolchain is' 1634 @echo ' available and, if not, explains why.' 1635 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1636 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1637 @echo ' is formatted, printing a diff otherwise.' 1638 @echo ' rustdoc - Generate Rust documentation' 1639 @echo ' (requires kernel .config)' 1640 @echo ' rusttest - Runs the Rust tests' 1641 @echo ' (requires kernel .config; downloads external repos)' 1642 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1643 @echo ' (requires kernel .config)' 1644 @echo ' dir/file.[os] - Build specified target only' 1645 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1646 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1647 @echo ' The output is not intended to be compilable.' 1648 @echo ' dir/file.ll - Build the LLVM assembly file' 1649 @echo '' 1650 @$(if $(dtstree), \ 1651 echo 'Devicetree:'; \ 1652 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1653 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1654 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1655 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1656 echo ' dtbs_check - Validate device tree source files';\ 1657 echo '') 1658 1659 @echo 'Userspace tools targets:' 1660 @echo ' use "make tools/help"' 1661 @echo ' or "cd tools; make help"' 1662 @echo '' 1663 @echo 'Kernel packaging:' 1664 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1665 @echo '' 1666 @echo 'Documentation targets:' 1667 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1668 @echo '' 1669 @echo 'Architecture-specific targets ($(SRCARCH)):' 1670 @$(or $(archhelp),\ 1671 echo ' No architecture-specific help defined for $(SRCARCH)') 1672 @echo '' 1673 @$(if $(boards), \ 1674 $(foreach b, $(boards), \ 1675 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1676 echo '') 1677 @$(if $(board-dirs), \ 1678 $(foreach b, $(board-dirs), \ 1679 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1680 printf " %-16s - Show all of the above\\n" help-boards; \ 1681 echo '') 1682 1683 @echo ' make V=n [targets] 1: verbose build' 1684 @echo ' 2: give reason for rebuild of target' 1685 @echo ' V=1 and V=2 can be combined with V=12' 1686 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1687 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1688 @echo ' (sparse by default)' 1689 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1690 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1691 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1692 @echo ' 1: warnings which may be relevant and do not occur too often' 1693 @echo ' 2: warnings which occur quite often but may still be relevant' 1694 @echo ' 3: more obscure warnings, can most likely be ignored' 1695 @echo ' c: extra checks in the configuration stage (Kconfig)' 1696 @echo ' e: warnings are being treated as errors' 1697 @echo ' Multiple levels can be combined with W=12 or W=123' 1698 @$(if $(dtstree), \ 1699 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1700 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1701 ) 1702 @echo '' 1703 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1704 @echo 'For further info see the ./README file' 1705 1706 1707help-board-dirs := $(addprefix help-,$(board-dirs)) 1708 1709help-boards: $(help-board-dirs) 1710 1711boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1712 1713$(help-board-dirs): help-%: 1714 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1715 @$(if $(boards-per-dir), \ 1716 $(foreach b, $(boards-per-dir), \ 1717 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1718 echo '') 1719 1720 1721# Documentation targets 1722# --------------------------------------------------------------------------- 1723DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1724 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1725PHONY += $(DOC_TARGETS) 1726$(DOC_TARGETS): 1727 $(Q)$(MAKE) $(build)=Documentation $@ 1728 1729 1730# Rust targets 1731# --------------------------------------------------------------------------- 1732 1733# "Is Rust available?" target 1734PHONY += rustavailable 1735rustavailable: 1736 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1737 1738# Documentation target 1739# 1740# Using the singular to avoid running afoul of `no-dot-config-targets`. 1741PHONY += rustdoc 1742rustdoc: prepare 1743 $(Q)$(MAKE) $(build)=rust $@ 1744 1745# Testing target 1746PHONY += rusttest 1747rusttest: prepare 1748 $(Q)$(MAKE) $(build)=rust $@ 1749 1750# Formatting targets 1751PHONY += rustfmt rustfmtcheck 1752 1753# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1754# 1755# We match using absolute paths since `find` does not resolve them 1756# when matching, which is a problem when e.g. `srctree` is `..`. 1757# We `grep` afterwards in order to remove the directory entry itself. 1758rustfmt: 1759 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1760 -o -path $(abs_srctree)/rust/alloc -prune \ 1761 -o -path $(abs_objtree)/rust/test -prune \ 1762 | grep -Fv $(abs_srctree)/rust/alloc \ 1763 | grep -Fv $(abs_objtree)/rust/test \ 1764 | grep -Fv generated \ 1765 | xargs $(RUSTFMT) $(rustfmt_flags) 1766 1767rustfmtcheck: rustfmt_flags = --check 1768rustfmtcheck: rustfmt 1769 1770# Misc 1771# --------------------------------------------------------------------------- 1772 1773PHONY += misc-check 1774misc-check: 1775 $(Q)$(srctree)/scripts/misc-check 1776 1777all: misc-check 1778 1779PHONY += scripts_gdb 1780scripts_gdb: prepare0 1781 $(Q)$(MAKE) $(build)=scripts/gdb 1782 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1783 1784ifdef CONFIG_GDB_SCRIPTS 1785all: scripts_gdb 1786endif 1787 1788else # KBUILD_EXTMOD 1789 1790filechk_kernel.release = echo $(KERNELRELEASE) 1791 1792### 1793# External module support. 1794# When building external modules the kernel used as basis is considered 1795# read-only, and no consistency checks are made and the make 1796# system is not used on the basis kernel. If updates are required 1797# in the basis kernel ordinary make commands (without M=...) must be used. 1798 1799# We are always building only modules. 1800KBUILD_BUILTIN := 1801KBUILD_MODULES := 1 1802 1803build-dir := $(KBUILD_EXTMOD) 1804 1805compile_commands.json: $(extmod_prefix)compile_commands.json 1806PHONY += compile_commands.json 1807 1808clean-dirs := $(KBUILD_EXTMOD) 1809clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1810 $(KBUILD_EXTMOD)/compile_commands.json 1811 1812PHONY += prepare 1813# now expand this into a simple variable to reduce the cost of shell evaluations 1814prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1815prepare: 1816 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1817 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1818 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1819 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1820 fi 1821 1822PHONY += help 1823help: 1824 @echo ' Building external modules.' 1825 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1826 @echo '' 1827 @echo ' modules - default target, build the module(s)' 1828 @echo ' modules_install - install the module' 1829 @echo ' clean - remove generated files in module directory only' 1830 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1831 @echo '' 1832 1833ifndef CONFIG_MODULES 1834modules modules_install: __external_modules_error 1835__external_modules_error: 1836 @echo >&2 '***' 1837 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1838 @echo >&2 '*** You cannot build or install external modules.' 1839 @echo >&2 '***' 1840 @false 1841endif 1842 1843endif # KBUILD_EXTMOD 1844 1845# --------------------------------------------------------------------------- 1846# Modules 1847 1848PHONY += modules modules_install modules_sign modules_prepare 1849 1850modules_install: 1851 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1852 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1853 1854ifeq ($(CONFIG_MODULE_SIG),y) 1855# modules_sign is a subset of modules_install. 1856# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1857modules_sign: modules_install 1858 @: 1859else 1860modules_sign: 1861 @echo >&2 '***' 1862 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1863 @echo >&2 '***' 1864 @false 1865endif 1866 1867ifdef CONFIG_MODULES 1868 1869$(MODORDER): $(build-dir) 1870 @: 1871 1872# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1873# This is solely useful to speed up test compiles. 1874modules: modpost 1875ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1876 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1877endif 1878 1879PHONY += modules_check 1880modules_check: $(MODORDER) 1881 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1882 1883else # CONFIG_MODULES 1884 1885modules: 1886 @: 1887 1888KBUILD_MODULES := 1889 1890endif # CONFIG_MODULES 1891 1892PHONY += modpost 1893modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1894 $(if $(KBUILD_MODULES), modules_check) 1895 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1896 1897# Single targets 1898# --------------------------------------------------------------------------- 1899# To build individual files in subdirectories, you can do like this: 1900# 1901# make foo/bar/baz.s 1902# 1903# The supported suffixes for single-target are listed in 'single-targets' 1904# 1905# To build only under specific subdirectories, you can do like this: 1906# 1907# make foo/bar/baz/ 1908 1909ifdef single-build 1910 1911# .ko is special because modpost is needed 1912single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1913single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1914 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1915 1916$(single-ko): single_modules 1917 @: 1918$(single-no-ko): $(build-dir) 1919 @: 1920 1921# Remove MODORDER when done because it is not the real one. 1922PHONY += single_modules 1923single_modules: $(single-no-ko) modules_prepare 1924 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1925 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1926ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1927 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1928endif 1929 $(Q)rm -f $(MODORDER) 1930 1931single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1932 1933KBUILD_MODULES := 1 1934 1935endif 1936 1937# Preset locale variables to speed up the build process. Limit locale 1938# tweaks to this spot to avoid wrong language settings when running 1939# make menuconfig etc. 1940# Error messages still appears in the original language 1941PHONY += $(build-dir) 1942$(build-dir): prepare 1943 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1944 1945clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1946PHONY += $(clean-dirs) clean 1947$(clean-dirs): 1948 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1949 1950clean: $(clean-dirs) 1951 $(call cmd,rmfiles) 1952 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1953 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1954 -o -name '*.ko.*' \ 1955 -o -name '*.dtb' -o -name '*.dtbo' \ 1956 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1957 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1958 -o -name '*.dwo' -o -name '*.lst' \ 1959 -o -name '*.su' -o -name '*.mod' \ 1960 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1961 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1962 -o -name '*.asn1.[ch]' \ 1963 -o -name '*.symtypes' -o -name 'modules.order' \ 1964 -o -name '*.c.[012]*.*' \ 1965 -o -name '*.ll' \ 1966 -o -name '*.gcno' \ 1967 \) -type f -print \ 1968 -o -name '.tmp_*' -print \ 1969 | xargs rm -rf 1970 1971# Generate tags for editors 1972# --------------------------------------------------------------------------- 1973quiet_cmd_tags = GEN $@ 1974 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1975 1976tags TAGS cscope gtags: FORCE 1977 $(call cmd,tags) 1978 1979# Generate rust-project.json (a file that describes the structure of non-Cargo 1980# Rust projects) for rust-analyzer (an implementation of the Language Server 1981# Protocol). 1982PHONY += rust-analyzer 1983rust-analyzer: 1984 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1985 $(Q)$(MAKE) $(build)=rust $@ 1986 1987# Script to generate missing namespace dependencies 1988# --------------------------------------------------------------------------- 1989 1990PHONY += nsdeps 1991nsdeps: export KBUILD_NSDEPS=1 1992nsdeps: modules 1993 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1994 1995# Clang Tooling 1996# --------------------------------------------------------------------------- 1997 1998quiet_cmd_gen_compile_commands = GEN $@ 1999 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2000 2001$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2002 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2003 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2004 $(call if_changed,gen_compile_commands) 2005 2006targets += $(extmod_prefix)compile_commands.json 2007 2008PHONY += clang-tidy clang-analyzer 2009 2010ifdef CONFIG_CC_IS_CLANG 2011quiet_cmd_clang_tools = CHECK $< 2012 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2013 2014clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2015 $(call cmd,clang_tools) 2016else 2017clang-tidy clang-analyzer: 2018 @echo "$@ requires CC=clang" >&2 2019 @false 2020endif 2021 2022# Scripts to check various things for consistency 2023# --------------------------------------------------------------------------- 2024 2025PHONY += includecheck versioncheck coccicheck export_report 2026 2027includecheck: 2028 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2029 -name '*.[hcS]' -type f -print | sort \ 2030 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2031 2032versioncheck: 2033 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2034 -name '*.[hcS]' -type f -print | sort \ 2035 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2036 2037coccicheck: 2038 $(Q)$(BASH) $(srctree)/scripts/$@ 2039 2040export_report: 2041 $(PERL) $(srctree)/scripts/export_report.pl 2042 2043PHONY += checkstack kernelrelease kernelversion image_name 2044 2045# UML needs a little special treatment here. It wants to use the host 2046# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2047# else wants $(ARCH), including people doing cross-builds, which means 2048# that $(SUBARCH) doesn't work here. 2049ifeq ($(ARCH), um) 2050CHECKSTACK_ARCH := $(SUBARCH) 2051else 2052CHECKSTACK_ARCH := $(ARCH) 2053endif 2054MINSTACKSIZE ?= 100 2055checkstack: 2056 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2057 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2058 2059kernelrelease: 2060 @$(filechk_kernel.release) 2061 2062kernelversion: 2063 @echo $(KERNELVERSION) 2064 2065image_name: 2066 @echo $(KBUILD_IMAGE) 2067 2068PHONY += run-command 2069run-command: 2070 $(Q)$(KBUILD_RUN_COMMAND) 2071 2072quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2073 cmd_rmfiles = rm -rf $(rm-files) 2074 2075# read saved command lines for existing targets 2076existing-targets := $(wildcard $(sort $(targets))) 2077 2078-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2079 2080endif # config-build 2081endif # mixed-build 2082endif # need-sub-make 2083 2084PHONY += FORCE 2085FORCE: 2086 2087# Declare the contents of the PHONY variable as phony. We keep that 2088# information in a variable so we can use it in if_changed and friends. 2089.PHONY: $(PHONY) 2090