1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 6 4SUBLEVEL = 0 5EXTRAVERSION = 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 modules_sign kernelrelease image_name 284no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 285 image_name 286single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 287 288config-build := 289mixed-build := 290need-config := 1 291need-compiler := 1 292may-sync-config := 1 293single-build := 294 295ifneq ($(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 -Dclippy::no_mangle_with_rust_abi \ 471 -Wclippy::dbg_macro 472 473KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 474KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 475KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 476 -Zallow-features= $(HOSTRUSTFLAGS) 477KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 478KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 479 480# Make variables (CC, etc...) 481CPP = $(CC) -E 482ifneq ($(LLVM),) 483CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 484LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 485AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 486NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 487OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 488OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 489READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 490STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 491else 492CC = $(CROSS_COMPILE)gcc 493LD = $(CROSS_COMPILE)ld 494AR = $(CROSS_COMPILE)ar 495NM = $(CROSS_COMPILE)nm 496OBJCOPY = $(CROSS_COMPILE)objcopy 497OBJDUMP = $(CROSS_COMPILE)objdump 498READELF = $(CROSS_COMPILE)readelf 499STRIP = $(CROSS_COMPILE)strip 500endif 501RUSTC = rustc 502RUSTDOC = rustdoc 503RUSTFMT = rustfmt 504CLIPPY_DRIVER = clippy-driver 505BINDGEN = bindgen 506CARGO = cargo 507PAHOLE = pahole 508RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 509LEX = flex 510YACC = bison 511AWK = awk 512INSTALLKERNEL := installkernel 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 566 567KBUILD_CPPFLAGS := -D__KERNEL__ 568KBUILD_RUSTFLAGS := $(rust_common_flags) \ 569 --target=$(objtree)/scripts/target.json \ 570 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 571 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 572 -Csymbol-mangling-version=v0 \ 573 -Crelocation-model=static \ 574 -Zfunction-sections=n \ 575 -Dclippy::float_arithmetic 576 577KBUILD_AFLAGS_KERNEL := 578KBUILD_CFLAGS_KERNEL := 579KBUILD_RUSTFLAGS_KERNEL := 580KBUILD_AFLAGS_MODULE := -DMODULE 581KBUILD_CFLAGS_MODULE := -DMODULE 582KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 583KBUILD_LDFLAGS_MODULE := 584KBUILD_LDFLAGS := 585CLANG_FLAGS := 586 587ifeq ($(KBUILD_CLIPPY),1) 588 RUSTC_OR_CLIPPY_QUIET := CLIPPY 589 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 590else 591 RUSTC_OR_CLIPPY_QUIET := RUSTC 592 RUSTC_OR_CLIPPY = $(RUSTC) 593endif 594 595ifdef RUST_LIB_SRC 596 export RUST_LIB_SRC 597endif 598 599# Allows the usage of unstable features in stable compilers. 600export RUSTC_BOOTSTRAP := 1 601 602export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 603export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 604export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 605export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 606export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 607export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 608export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 609export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 610 611export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 612export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 613export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 614export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 615export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 616export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 617export PAHOLE_FLAGS 618 619# Files to ignore in find ... statements 620 621export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 622 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 623 -prune -o 624export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 625 --exclude CVS --exclude .pc --exclude .hg --exclude .git 626 627# =========================================================================== 628# Rules shared between *config targets and build targets 629 630# Basic helpers built in scripts/basic/ 631PHONY += scripts_basic 632scripts_basic: 633 $(Q)$(MAKE) $(build)=scripts/basic 634 635PHONY += outputmakefile 636ifdef building_out_of_srctree 637# Before starting out-of-tree build, make sure the source tree is clean. 638# outputmakefile generates a Makefile in the output directory, if using a 639# separate output directory. This allows convenient use of make in the 640# output directory. 641# At the same time when output Makefile generated, generate .gitignore to 642# ignore whole output directory 643 644quiet_cmd_makefile = GEN Makefile 645 cmd_makefile = { \ 646 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 647 echo "include $(srctree)/Makefile"; \ 648 } > Makefile 649 650outputmakefile: 651 @if [ -f $(srctree)/.config -o \ 652 -d $(srctree)/include/config -o \ 653 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 654 echo >&2 "***"; \ 655 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 656 echo >&2 "*** in $(abs_srctree)";\ 657 echo >&2 "***"; \ 658 false; \ 659 fi 660 $(Q)ln -fsn $(srctree) source 661 $(call cmd,makefile) 662 $(Q)test -e .gitignore || \ 663 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 664endif 665 666# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 667# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 668# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 669# and from include/config/auto.conf.cmd to detect the compiler upgrade. 670CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 671 672ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 673include $(srctree)/scripts/Makefile.clang 674endif 675 676# Include this also for config targets because some architectures need 677# cc-cross-prefix to determine CROSS_COMPILE. 678ifdef need-compiler 679include $(srctree)/scripts/Makefile.compiler 680endif 681 682ifdef config-build 683# =========================================================================== 684# *config targets only - make sure prerequisites are updated, and descend 685# in scripts/kconfig to make the *config target 686 687# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 688# KBUILD_DEFCONFIG may point out an alternative default configuration 689# used for 'make defconfig' 690include $(srctree)/arch/$(SRCARCH)/Makefile 691export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 692 693config: outputmakefile scripts_basic FORCE 694 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 695 696%config: outputmakefile scripts_basic FORCE 697 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 698 699else #!config-build 700# =========================================================================== 701# Build targets only - this includes vmlinux, arch specific targets, clean 702# targets and others. In general all targets except *config targets. 703 704# If building an external module we do not care about the all: rule 705# but instead __all depend on modules 706PHONY += all 707ifeq ($(KBUILD_EXTMOD),) 708__all: all 709else 710__all: modules 711endif 712 713targets := 714 715# Decide whether to build built-in, modular, or both. 716# Normally, just do built-in. 717 718KBUILD_MODULES := 719KBUILD_BUILTIN := 1 720 721# If we have only "make modules", don't compile built-in objects. 722ifeq ($(MAKECMDGOALS),modules) 723 KBUILD_BUILTIN := 724endif 725 726# If we have "make <whatever> modules", compile modules 727# in addition to whatever we do anyway. 728# Just "make" or "make all" shall build modules as well 729 730ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 731 KBUILD_MODULES := 1 732endif 733 734ifeq ($(MAKECMDGOALS),) 735 KBUILD_MODULES := 1 736endif 737 738export KBUILD_MODULES KBUILD_BUILTIN 739 740ifdef need-config 741include include/config/auto.conf 742endif 743 744ifeq ($(KBUILD_EXTMOD),) 745# Objects we will link into vmlinux / subdirs we need to visit 746core-y := 747drivers-y := 748libs-y := lib/ 749endif # KBUILD_EXTMOD 750 751# The all: target is the default when no target is given on the 752# command line. 753# This allow a user to issue only 'make' to build a kernel including modules 754# Defaults to vmlinux, but the arch makefile usually adds further targets 755all: vmlinux 756 757CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 758ifdef CONFIG_CC_IS_GCC 759CFLAGS_GCOV += -fno-tree-loop-im 760endif 761export CFLAGS_GCOV 762 763# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 764ifdef CONFIG_FUNCTION_TRACER 765 CC_FLAGS_FTRACE := -pg 766endif 767 768include $(srctree)/arch/$(SRCARCH)/Makefile 769 770ifdef need-config 771ifdef may-sync-config 772# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 773# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 774# because some architectures define CROSS_COMPILE there. 775include include/config/auto.conf.cmd 776 777$(KCONFIG_CONFIG): 778 @echo >&2 '***' 779 @echo >&2 '*** Configuration file "$@" not found!' 780 @echo >&2 '***' 781 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 782 @echo >&2 '*** "make menuconfig" or "make xconfig").' 783 @echo >&2 '***' 784 @/bin/false 785 786# The actual configuration files used during the build are stored in 787# include/generated/ and include/config/. Update them if .config is newer than 788# include/config/auto.conf (which mirrors .config). 789# 790# This exploits the 'multi-target pattern rule' trick. 791# The syncconfig should be executed only once to make all the targets. 792# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 793# 794# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 795# so you cannot notice that Kconfig is waiting for the user input. 796%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 797 $(Q)$(kecho) " SYNC $@" 798 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 799else # !may-sync-config 800# External modules and some install targets need include/generated/autoconf.h 801# and include/config/auto.conf but do not care if they are up-to-date. 802# Use auto.conf to trigger the test 803PHONY += include/config/auto.conf 804 805include/config/auto.conf: 806 @test -e include/generated/autoconf.h -a -e $@ || ( \ 807 echo >&2; \ 808 echo >&2 " ERROR: Kernel configuration is invalid."; \ 809 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 810 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 811 echo >&2 ; \ 812 /bin/false) 813 814endif # may-sync-config 815endif # need-config 816 817KBUILD_CFLAGS += -fno-delete-null-pointer-checks 818 819ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 820KBUILD_CFLAGS += -O2 821KBUILD_RUSTFLAGS += -Copt-level=2 822else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 823KBUILD_CFLAGS += -Os 824KBUILD_RUSTFLAGS += -Copt-level=s 825endif 826 827# Always set `debug-assertions` and `overflow-checks` because their default 828# depends on `opt-level` and `debug-assertions`, respectively. 829KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 830KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 831 832# Tell gcc to never replace conditional load with a non-conditional one 833ifdef CONFIG_CC_IS_GCC 834# gcc-10 renamed --param=allow-store-data-races=0 to 835# -fno-allow-store-data-races. 836KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 837KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 838endif 839 840ifdef CONFIG_READABLE_ASM 841# Disable optimizations that make assembler listings hard to read. 842# reorder blocks reorders the control in the function 843# ipa clone creates specialized cloned functions 844# partial inlining inlines only parts of functions 845KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 846endif 847 848stackp-flags-y := -fno-stack-protector 849stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 850stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 851 852KBUILD_CFLAGS += $(stackp-flags-y) 853 854KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 855KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 856 857ifdef CONFIG_FRAME_POINTER 858KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 859KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 860else 861# Some targets (ARM with Thumb2, for example), can't be built with frame 862# pointers. For those, we don't have FUNCTION_TRACER automatically 863# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 864# incompatible with -fomit-frame-pointer with current GCC, so we don't use 865# -fomit-frame-pointer with FUNCTION_TRACER. 866# In the Rust target specification, "frame-pointer" is set explicitly 867# to "may-omit". 868ifndef CONFIG_FUNCTION_TRACER 869KBUILD_CFLAGS += -fomit-frame-pointer 870endif 871endif 872 873# Initialize all stack variables with a 0xAA pattern. 874ifdef CONFIG_INIT_STACK_ALL_PATTERN 875KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 876endif 877 878# Initialize all stack variables with a zero value. 879ifdef CONFIG_INIT_STACK_ALL_ZERO 880KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 881ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 882# https://github.com/llvm/llvm-project/issues/44842 883CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 884export CC_AUTO_VAR_INIT_ZERO_ENABLER 885KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 886endif 887endif 888 889# While VLAs have been removed, GCC produces unreachable stack probes 890# for the randomize_kstack_offset feature. Disable it for all compilers. 891KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 892 893# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 894ifdef CONFIG_ZERO_CALL_USED_REGS 895KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 896endif 897 898ifdef CONFIG_FUNCTION_TRACER 899ifdef CONFIG_FTRACE_MCOUNT_USE_CC 900 CC_FLAGS_FTRACE += -mrecord-mcount 901 ifdef CONFIG_HAVE_NOP_MCOUNT 902 ifeq ($(call cc-option-yn, -mnop-mcount),y) 903 CC_FLAGS_FTRACE += -mnop-mcount 904 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 905 endif 906 endif 907endif 908ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 909 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 910 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 911 endif 912endif 913ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 914 ifdef CONFIG_HAVE_C_RECORDMCOUNT 915 BUILD_C_RECORDMCOUNT := y 916 export BUILD_C_RECORDMCOUNT 917 endif 918endif 919ifdef CONFIG_HAVE_FENTRY 920 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 921 ifeq ($(call cc-option-yn, -mfentry),y) 922 CC_FLAGS_FTRACE += -mfentry 923 CC_FLAGS_USING += -DCC_USING_FENTRY 924 endif 925endif 926export CC_FLAGS_FTRACE 927KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 928KBUILD_AFLAGS += $(CC_FLAGS_USING) 929endif 930 931# We trigger additional mismatches with less inlining 932ifdef CONFIG_DEBUG_SECTION_MISMATCH 933KBUILD_CFLAGS += -fno-inline-functions-called-once 934endif 935 936# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 937ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 938KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 939KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 940LDFLAGS_vmlinux += --gc-sections 941endif 942 943ifdef CONFIG_SHADOW_CALL_STACK 944ifndef CONFIG_DYNAMIC_SCS 945CC_FLAGS_SCS := -fsanitize=shadow-call-stack 946KBUILD_CFLAGS += $(CC_FLAGS_SCS) 947endif 948export CC_FLAGS_SCS 949endif 950 951ifdef CONFIG_LTO_CLANG 952ifdef CONFIG_LTO_CLANG_THIN 953CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 954KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 955else 956CC_FLAGS_LTO := -flto 957endif 958CC_FLAGS_LTO += -fvisibility=hidden 959 960# Limit inlining across translation units to reduce binary size 961KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 962 963# Check for frame size exceeding threshold during prolog/epilog insertion 964# when using lld < 13.0.0. 965ifneq ($(CONFIG_FRAME_WARN),0) 966ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 967KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 968endif 969endif 970endif 971 972ifdef CONFIG_LTO 973KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 974KBUILD_AFLAGS += -fno-lto 975export CC_FLAGS_LTO 976endif 977 978ifdef CONFIG_CFI_CLANG 979CC_FLAGS_CFI := -fsanitize=kcfi 980KBUILD_CFLAGS += $(CC_FLAGS_CFI) 981export CC_FLAGS_CFI 982endif 983 984ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 985KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 986endif 987 988# arch Makefile may override CC so keep this after arch Makefile is included 989NOSTDINC_FLAGS += -nostdinc 990 991# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 992# the kernel uses only C99 flexible arrays for dynamically sized trailing 993# arrays. Enforce this for everything that may examine structure sizes and 994# perform bounds checking. 995KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 996 997# disable invalid "can't wrap" optimizations for signed / pointers 998KBUILD_CFLAGS += -fno-strict-overflow 999 1000# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1001KBUILD_CFLAGS += -fno-stack-check 1002 1003# conserve stack if available 1004ifdef CONFIG_CC_IS_GCC 1005KBUILD_CFLAGS += -fconserve-stack 1006endif 1007 1008# change __FILE__ to the relative path from the srctree 1009KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1010 1011# include additional Makefiles when needed 1012include-y := scripts/Makefile.extrawarn 1013include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1014include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1015include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1016include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1017include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1018include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1019include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1020include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1021 1022include $(addprefix $(srctree)/, $(include-y)) 1023 1024# scripts/Makefile.gcc-plugins is intentionally included last. 1025# Do not add $(call cc-option,...) below this line. When you build the kernel 1026# from the clean source tree, the GCC plugins do not exist at this point. 1027 1028# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1029KBUILD_CPPFLAGS += $(KCPPFLAGS) 1030KBUILD_AFLAGS += $(KAFLAGS) 1031KBUILD_CFLAGS += $(KCFLAGS) 1032KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1033 1034KBUILD_LDFLAGS_MODULE += --build-id=sha1 1035LDFLAGS_vmlinux += --build-id=sha1 1036 1037KBUILD_LDFLAGS += -z noexecstack 1038ifeq ($(CONFIG_LD_IS_BFD),y) 1039KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1040endif 1041 1042ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1043LDFLAGS_vmlinux += -X 1044endif 1045 1046ifeq ($(CONFIG_RELR),y) 1047# ld.lld before 15 did not support -z pack-relative-relocs. 1048LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1049endif 1050 1051# We never want expected sections to be placed heuristically by the 1052# linker. All sections should be explicitly named in the linker script. 1053ifdef CONFIG_LD_ORPHAN_WARN 1054LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1055endif 1056 1057# Align the bit size of userspace programs with the kernel 1058KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1059KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1060 1061# make the checker run with the right architecture 1062CHECKFLAGS += --arch=$(ARCH) 1063 1064# insure the checker run with the right endianness 1065CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1066 1067# the checker needs the correct machine size 1068CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1069 1070# Default kernel image to build when no specific target is given. 1071# KBUILD_IMAGE may be overruled on the command line or 1072# set in the environment 1073# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1074# this default value 1075export KBUILD_IMAGE ?= vmlinux 1076 1077# 1078# INSTALL_PATH specifies where to place the updated kernel and system map 1079# images. Default is /boot, but you can set it to other values 1080export INSTALL_PATH ?= /boot 1081 1082# 1083# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1084# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1085# an argument if needed. Otherwise it defaults to the kernel install path 1086# 1087export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1088 1089# 1090# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1091# relocations required by build roots. This is not defined in the 1092# makefile but the argument can be passed to make if needed. 1093# 1094 1095MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1096export MODLIB 1097 1098PHONY += prepare0 1099 1100export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1101export MODORDER := $(extmod_prefix)modules.order 1102export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1103 1104ifeq ($(KBUILD_EXTMOD),) 1105 1106build-dir := . 1107clean-dirs := $(sort . Documentation \ 1108 $(patsubst %/,%,$(filter %/, $(core-) \ 1109 $(drivers-) $(libs-)))) 1110 1111export ARCH_CORE := $(core-y) 1112export ARCH_LIB := $(filter %/, $(libs-y)) 1113export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1114# Externally visible symbols (used by link-vmlinux.sh) 1115 1116KBUILD_VMLINUX_OBJS := ./built-in.a 1117ifdef CONFIG_MODULES 1118KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1119KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1120else 1121KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1122endif 1123 1124export KBUILD_VMLINUX_LIBS 1125export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1126 1127ifdef CONFIG_TRIM_UNUSED_KSYMS 1128# For the kernel to actually contain only the needed exported symbols, 1129# we have to build modules as well to determine what those symbols are. 1130KBUILD_MODULES := 1 1131endif 1132 1133# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1134quiet_cmd_ar_vmlinux.a = AR $@ 1135 cmd_ar_vmlinux.a = \ 1136 rm -f $@; \ 1137 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1138 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1139 1140targets += vmlinux.a 1141vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1142 $(call if_changed,ar_vmlinux.a) 1143 1144PHONY += vmlinux_o 1145vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1146 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1147 1148vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1149 @: 1150 1151PHONY += vmlinux 1152# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1153# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1154# unrelated; the decompressors just happen to have the same base name, 1155# arch/*/boot/compressed/vmlinux. 1156# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1157# 1158# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1159# https://savannah.gnu.org/bugs/?61463 1160# For Make > 4.4, the following simple code will work: 1161# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1162vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1163vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1164vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1165 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1166 1167# The actual objects are generated when descending, 1168# make sure no implicit rule kicks in 1169$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1170 1171ifeq ($(origin KERNELRELEASE),file) 1172filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1173else 1174filechk_kernel.release = echo $(KERNELRELEASE) 1175endif 1176 1177# Store (new) KERNELRELEASE string in include/config/kernel.release 1178include/config/kernel.release: FORCE 1179 $(call filechk,kernel.release) 1180 1181# Additional helpers built in scripts/ 1182# Carefully list dependencies so we do not try to build scripts twice 1183# in parallel 1184PHONY += scripts 1185scripts: scripts_basic scripts_dtc 1186 $(Q)$(MAKE) $(build)=$(@) 1187 1188# Things we need to do before we recursively start building the kernel 1189# or the modules are listed in "prepare". 1190# A multi level approach is used. prepareN is processed before prepareN-1. 1191# archprepare is used in arch Makefiles and when processed asm symlink, 1192# version.h and scripts_basic is processed / created. 1193 1194PHONY += prepare archprepare 1195 1196archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1197 asm-generic $(version_h) include/generated/utsrelease.h \ 1198 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1199 1200prepare0: archprepare 1201 $(Q)$(MAKE) $(build)=scripts/mod 1202 $(Q)$(MAKE) $(build)=. prepare 1203 1204# All the preparing.. 1205prepare: prepare0 1206ifdef CONFIG_RUST 1207 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1208 $(Q)$(MAKE) $(build)=rust 1209endif 1210 1211PHONY += remove-stale-files 1212remove-stale-files: 1213 $(Q)$(srctree)/scripts/remove-stale-files 1214 1215# Support for using generic headers in asm-generic 1216asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1217 1218PHONY += asm-generic uapi-asm-generic 1219asm-generic: uapi-asm-generic 1220 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1221 generic=include/asm-generic 1222uapi-asm-generic: 1223 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1224 generic=include/uapi/asm-generic 1225 1226# Generate some files 1227# --------------------------------------------------------------------------- 1228 1229# KERNELRELEASE can change from a few different places, meaning version.h 1230# needs to be updated, so this check is forced on all builds 1231 1232uts_len := 64 1233define filechk_utsrelease.h 1234 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1235 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1236 exit 1; \ 1237 fi; \ 1238 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1239endef 1240 1241define filechk_version.h 1242 if [ $(SUBLEVEL) -gt 255 ]; then \ 1243 echo \#define LINUX_VERSION_CODE $(shell \ 1244 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1245 else \ 1246 echo \#define LINUX_VERSION_CODE $(shell \ 1247 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1248 fi; \ 1249 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1250 ((c) > 255 ? 255 : (c)))'; \ 1251 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1252 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1253 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1254endef 1255 1256$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1257$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1258$(version_h): FORCE 1259 $(call filechk,version.h) 1260 1261include/generated/utsrelease.h: include/config/kernel.release FORCE 1262 $(call filechk,utsrelease.h) 1263 1264filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1265 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1266 1267include/generated/compile.h: FORCE 1268 $(call filechk,compile.h) 1269 1270PHONY += headerdep 1271headerdep: 1272 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1273 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1274 1275# --------------------------------------------------------------------------- 1276# Kernel headers 1277 1278#Default location for installed headers 1279export INSTALL_HDR_PATH = $(objtree)/usr 1280 1281quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1282 cmd_headers_install = \ 1283 mkdir -p $(INSTALL_HDR_PATH); \ 1284 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1285 usr/include $(INSTALL_HDR_PATH) 1286 1287PHONY += headers_install 1288headers_install: headers 1289 $(call cmd,headers_install) 1290 1291PHONY += archheaders archscripts 1292 1293hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1294 1295PHONY += headers 1296headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1297 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1298 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1299 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1300 1301ifdef CONFIG_HEADERS_INSTALL 1302prepare: headers 1303endif 1304 1305PHONY += scripts_unifdef 1306scripts_unifdef: scripts_basic 1307 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1308 1309# --------------------------------------------------------------------------- 1310# Install 1311 1312# Many distributions have the custom install script, /sbin/installkernel. 1313# If DKMS is installed, 'make install' will eventually recurse back 1314# to this Makefile to build and install external modules. 1315# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1316 1317quiet_cmd_install = INSTALL $(INSTALL_PATH) 1318 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1319 1320# --------------------------------------------------------------------------- 1321# Tools 1322 1323ifdef CONFIG_OBJTOOL 1324prepare: tools/objtool 1325endif 1326 1327ifdef CONFIG_BPF 1328ifdef CONFIG_DEBUG_INFO_BTF 1329prepare: tools/bpf/resolve_btfids 1330endif 1331endif 1332 1333PHONY += resolve_btfids_clean 1334 1335resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1336 1337# tools/bpf/resolve_btfids directory might not exist 1338# in output directory, skip its clean in that case 1339resolve_btfids_clean: 1340ifneq ($(wildcard $(resolve_btfids_O)),) 1341 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1342endif 1343 1344# Clear a bunch of variables before executing the submake 1345ifeq ($(quiet),silent_) 1346tools_silent=s 1347endif 1348 1349tools/: FORCE 1350 $(Q)mkdir -p $(objtree)/tools 1351 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1352 1353tools/%: FORCE 1354 $(Q)mkdir -p $(objtree)/tools 1355 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1356 1357# --------------------------------------------------------------------------- 1358# Kernel selftest 1359 1360PHONY += kselftest 1361kselftest: headers 1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1363 1364kselftest-%: headers FORCE 1365 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1366 1367PHONY += kselftest-merge 1368kselftest-merge: 1369 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1370 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1371 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1372 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1373 1374# --------------------------------------------------------------------------- 1375# Devicetree files 1376 1377ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1378dtstree := arch/$(SRCARCH)/boot/dts 1379endif 1380 1381ifneq ($(dtstree),) 1382 1383%.dtb: dtbs_prepare 1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1385 1386%.dtbo: dtbs_prepare 1387 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1388 1389PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1390dtbs: dtbs_prepare 1391 $(Q)$(MAKE) $(build)=$(dtstree) 1392 1393# include/config/kernel.release is actually needed when installing DTBs because 1394# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1395# dtbs_install depend on it as dtbs_install may run as root. 1396dtbs_prepare: include/config/kernel.release scripts_dtc 1397 1398ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1399export CHECK_DTBS=y 1400endif 1401 1402ifneq ($(CHECK_DTBS),) 1403dtbs_prepare: dt_binding_check 1404endif 1405 1406dtbs_check: dtbs 1407 1408dtbs_install: 1409 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1410 1411ifdef CONFIG_OF_EARLY_FLATTREE 1412all: dtbs 1413endif 1414 1415endif 1416 1417PHONY += scripts_dtc 1418scripts_dtc: scripts_basic 1419 $(Q)$(MAKE) $(build)=scripts/dtc 1420 1421ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1422export CHECK_DT_BINDING=y 1423endif 1424 1425PHONY += dt_binding_check 1426dt_binding_check: scripts_dtc 1427 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1428 1429PHONY += dt_compatible_check 1430dt_compatible_check: dt_binding_check 1431 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1432 1433# --------------------------------------------------------------------------- 1434# Modules 1435 1436ifdef CONFIG_MODULES 1437 1438# By default, build modules as well 1439 1440all: modules 1441 1442# When we're building modules with modversions, we need to consider 1443# the built-in objects during the descend as well, in order to 1444# make sure the checksums are up to date before we record them. 1445ifdef CONFIG_MODVERSIONS 1446 KBUILD_BUILTIN := 1 1447endif 1448 1449# Build modules 1450# 1451 1452# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1453# is an exception. 1454ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1455KBUILD_BUILTIN := 1 1456modules: vmlinux 1457endif 1458 1459modules: modules_prepare 1460 1461# Target to prepare building external modules 1462modules_prepare: prepare 1463 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1464 1465endif # CONFIG_MODULES 1466 1467### 1468# Cleaning is done on three levels. 1469# make clean Delete most generated files 1470# Leave enough to build external modules 1471# make mrproper Delete the current configuration, and all generated files 1472# make distclean Remove editor backup files, patch leftover files and the like 1473 1474# Directories & files removed with 'make clean' 1475CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1476 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1477 compile_commands.json .thinlto-cache rust/test \ 1478 rust-project.json .vmlinux.objs .vmlinux.export.c 1479 1480# Directories & files removed with 'make mrproper' 1481MRPROPER_FILES += include/config include/generated \ 1482 arch/$(SRCARCH)/include/generated .objdiff \ 1483 debian snap tar-install \ 1484 .config .config.old .version \ 1485 Module.symvers \ 1486 certs/signing_key.pem \ 1487 certs/x509.genkey \ 1488 vmlinux-gdb.py \ 1489 kernel.spec rpmbuild \ 1490 rust/libmacros.so 1491 1492# clean - Delete most, but leave enough to build external modules 1493# 1494clean: rm-files := $(CLEAN_FILES) 1495 1496PHONY += archclean vmlinuxclean 1497 1498vmlinuxclean: 1499 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1500 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1501 1502clean: archclean vmlinuxclean resolve_btfids_clean 1503 1504# mrproper - Delete all generated files, including .config 1505# 1506mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1507mrproper-dirs := $(addprefix _mrproper_,scripts) 1508 1509PHONY += $(mrproper-dirs) mrproper 1510$(mrproper-dirs): 1511 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1512 1513mrproper: clean $(mrproper-dirs) 1514 $(call cmd,rmfiles) 1515 @find . $(RCS_FIND_IGNORE) \ 1516 \( -name '*.rmeta' \) \ 1517 -type f -print | xargs rm -f 1518 1519# distclean 1520# 1521PHONY += distclean 1522 1523distclean: mrproper 1524 @find . $(RCS_FIND_IGNORE) \ 1525 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1526 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1527 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1528 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1529 -type f -print | xargs rm -f 1530 1531 1532# Packaging of the kernel to various formats 1533# --------------------------------------------------------------------------- 1534 1535%src-pkg: FORCE 1536 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1537%pkg: include/config/kernel.release FORCE 1538 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1539 1540# Brief documentation of the typical targets used 1541# --------------------------------------------------------------------------- 1542 1543boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1544boards := $(sort $(notdir $(boards))) 1545board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1546board-dirs := $(sort $(notdir $(board-dirs:/=))) 1547 1548PHONY += help 1549help: 1550 @echo 'Cleaning targets:' 1551 @echo ' clean - Remove most generated files but keep the config and' 1552 @echo ' enough build support to build external modules' 1553 @echo ' mrproper - Remove all generated files + config + various backup files' 1554 @echo ' distclean - mrproper + remove editor backup and patch files' 1555 @echo '' 1556 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1557 @echo '' 1558 @echo 'Other generic targets:' 1559 @echo ' all - Build all targets marked with [*]' 1560 @echo '* vmlinux - Build the bare kernel' 1561 @echo '* modules - Build all modules' 1562 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1563 @echo ' dir/ - Build all files in dir and below' 1564 @echo ' dir/file.[ois] - Build specified target only' 1565 @echo ' dir/file.ll - Build the LLVM assembly file' 1566 @echo ' (requires compiler support for LLVM assembly generation)' 1567 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1568 @echo ' (requires a recent binutils and recent build (System.map))' 1569 @echo ' dir/file.ko - Build module including final link' 1570 @echo ' modules_prepare - Set up for building external modules' 1571 @echo ' tags/TAGS - Generate tags file for editors' 1572 @echo ' cscope - Generate cscope index' 1573 @echo ' gtags - Generate GNU GLOBAL index' 1574 @echo ' kernelrelease - Output the release version string (use with make -s)' 1575 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1576 @echo ' image_name - Output the image name (use with make -s)' 1577 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1578 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1579 echo '' 1580 @echo 'Static analysers:' 1581 @echo ' checkstack - Generate a list of stack hogs' 1582 @echo ' versioncheck - Sanity check on version.h usage' 1583 @echo ' includecheck - Check for duplicate included header files' 1584 @echo ' export_report - List the usages of all exported symbols' 1585 @echo ' headerdep - Detect inclusion cycles in headers' 1586 @echo ' coccicheck - Check with Coccinelle' 1587 @echo ' clang-analyzer - Check with clang static analyzer' 1588 @echo ' clang-tidy - Check with clang-tidy' 1589 @echo '' 1590 @echo 'Tools:' 1591 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1592 @echo '' 1593 @echo 'Kernel selftest:' 1594 @echo ' kselftest - Build and run kernel selftest' 1595 @echo ' Build, install, and boot kernel before' 1596 @echo ' running kselftest on it' 1597 @echo ' Run as root for full coverage' 1598 @echo ' kselftest-all - Build kernel selftest' 1599 @echo ' kselftest-install - Build and install kernel selftest' 1600 @echo ' kselftest-clean - Remove all generated kselftest files' 1601 @echo ' kselftest-merge - Merge all the config dependencies of' 1602 @echo ' kselftest to existing .config.' 1603 @echo '' 1604 @echo 'Rust targets:' 1605 @echo ' rustavailable - Checks whether the Rust toolchain is' 1606 @echo ' available and, if not, explains why.' 1607 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1608 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1609 @echo ' is formatted, printing a diff otherwise.' 1610 @echo ' rustdoc - Generate Rust documentation' 1611 @echo ' (requires kernel .config)' 1612 @echo ' rusttest - Runs the Rust tests' 1613 @echo ' (requires kernel .config; downloads external repos)' 1614 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1615 @echo ' (requires kernel .config)' 1616 @echo ' dir/file.[os] - Build specified target only' 1617 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1618 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1619 @echo ' The output is not intended to be compilable.' 1620 @echo ' dir/file.ll - Build the LLVM assembly file' 1621 @echo '' 1622 @$(if $(dtstree), \ 1623 echo 'Devicetree:'; \ 1624 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1625 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1626 echo ' dt_binding_check - Validate device tree binding documents'; \ 1627 echo ' dtbs_check - Validate device tree source files';\ 1628 echo '') 1629 1630 @echo 'Userspace tools targets:' 1631 @echo ' use "make tools/help"' 1632 @echo ' or "cd tools; make help"' 1633 @echo '' 1634 @echo 'Kernel packaging:' 1635 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1636 @echo '' 1637 @echo 'Documentation targets:' 1638 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1639 @echo '' 1640 @echo 'Architecture specific targets ($(SRCARCH)):' 1641 @$(or $(archhelp),\ 1642 echo ' No architecture specific help defined for $(SRCARCH)') 1643 @echo '' 1644 @$(if $(boards), \ 1645 $(foreach b, $(boards), \ 1646 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1647 echo '') 1648 @$(if $(board-dirs), \ 1649 $(foreach b, $(board-dirs), \ 1650 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1651 printf " %-16s - Show all of the above\\n" help-boards; \ 1652 echo '') 1653 1654 @echo ' make V=n [targets] 1: verbose build' 1655 @echo ' 2: give reason for rebuild of target' 1656 @echo ' V=1 and V=2 can be combined with V=12' 1657 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1658 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1659 @echo ' (sparse by default)' 1660 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1661 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1662 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1663 @echo ' 1: warnings which may be relevant and do not occur too often' 1664 @echo ' 2: warnings which occur quite often but may still be relevant' 1665 @echo ' 3: more obscure warnings, can most likely be ignored' 1666 @echo ' e: warnings are being treated as errors' 1667 @echo ' Multiple levels can be combined with W=12 or W=123' 1668 @$(if $(dtstree), \ 1669 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1670 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1671 ) 1672 @echo '' 1673 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1674 @echo 'For further info see the ./README file' 1675 1676 1677help-board-dirs := $(addprefix help-,$(board-dirs)) 1678 1679help-boards: $(help-board-dirs) 1680 1681boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1682 1683$(help-board-dirs): help-%: 1684 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1685 @$(if $(boards-per-dir), \ 1686 $(foreach b, $(boards-per-dir), \ 1687 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1688 echo '') 1689 1690 1691# Documentation targets 1692# --------------------------------------------------------------------------- 1693DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1694 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1695PHONY += $(DOC_TARGETS) 1696$(DOC_TARGETS): 1697 $(Q)$(MAKE) $(build)=Documentation $@ 1698 1699 1700# Rust targets 1701# --------------------------------------------------------------------------- 1702 1703# "Is Rust available?" target 1704PHONY += rustavailable 1705rustavailable: 1706 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1707 1708# Documentation target 1709# 1710# Using the singular to avoid running afoul of `no-dot-config-targets`. 1711PHONY += rustdoc 1712rustdoc: prepare 1713 $(Q)$(MAKE) $(build)=rust $@ 1714 1715# Testing target 1716PHONY += rusttest 1717rusttest: prepare 1718 $(Q)$(MAKE) $(build)=rust $@ 1719 1720# Formatting targets 1721PHONY += rustfmt rustfmtcheck 1722 1723# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1724# 1725# We match using absolute paths since `find` does not resolve them 1726# when matching, which is a problem when e.g. `srctree` is `..`. 1727# We `grep` afterwards in order to remove the directory entry itself. 1728rustfmt: 1729 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1730 -o -path $(abs_srctree)/rust/alloc -prune \ 1731 -o -path $(abs_objtree)/rust/test -prune \ 1732 | grep -Fv $(abs_srctree)/rust/alloc \ 1733 | grep -Fv $(abs_objtree)/rust/test \ 1734 | grep -Fv generated \ 1735 | xargs $(RUSTFMT) $(rustfmt_flags) 1736 1737rustfmtcheck: rustfmt_flags = --check 1738rustfmtcheck: rustfmt 1739 1740# Misc 1741# --------------------------------------------------------------------------- 1742 1743PHONY += misc-check 1744misc-check: 1745 $(Q)$(srctree)/scripts/misc-check 1746 1747all: misc-check 1748 1749PHONY += scripts_gdb 1750scripts_gdb: prepare0 1751 $(Q)$(MAKE) $(build)=scripts/gdb 1752 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1753 1754ifdef CONFIG_GDB_SCRIPTS 1755all: scripts_gdb 1756endif 1757 1758else # KBUILD_EXTMOD 1759 1760filechk_kernel.release = echo $(KERNELRELEASE) 1761 1762### 1763# External module support. 1764# When building external modules the kernel used as basis is considered 1765# read-only, and no consistency checks are made and the make 1766# system is not used on the basis kernel. If updates are required 1767# in the basis kernel ordinary make commands (without M=...) must be used. 1768 1769# We are always building only modules. 1770KBUILD_BUILTIN := 1771KBUILD_MODULES := 1 1772 1773build-dir := $(KBUILD_EXTMOD) 1774 1775compile_commands.json: $(extmod_prefix)compile_commands.json 1776PHONY += compile_commands.json 1777 1778clean-dirs := $(KBUILD_EXTMOD) 1779clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1780 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1781 1782PHONY += prepare 1783# now expand this into a simple variable to reduce the cost of shell evaluations 1784prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1785prepare: 1786 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1787 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1788 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1789 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1790 fi 1791 1792PHONY += help 1793help: 1794 @echo ' Building external modules.' 1795 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1796 @echo '' 1797 @echo ' modules - default target, build the module(s)' 1798 @echo ' modules_install - install the module' 1799 @echo ' clean - remove generated files in module directory only' 1800 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1801 @echo '' 1802 1803ifndef CONFIG_MODULES 1804modules modules_install: __external_modules_error 1805__external_modules_error: 1806 @echo >&2 '***' 1807 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1808 @echo >&2 '*** You cannot build or install external modules.' 1809 @echo >&2 '***' 1810 @false 1811endif 1812 1813endif # KBUILD_EXTMOD 1814 1815# --------------------------------------------------------------------------- 1816# Modules 1817 1818PHONY += modules modules_install modules_sign modules_prepare 1819 1820modules_install: 1821 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1822 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1823 1824ifeq ($(CONFIG_MODULE_SIG),y) 1825# modules_sign is a subset of modules_install. 1826# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1827modules_sign: modules_install 1828 @: 1829else 1830modules_sign: 1831 @echo >&2 '***' 1832 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1833 @echo >&2 '***' 1834 @false 1835endif 1836 1837ifdef CONFIG_MODULES 1838 1839$(MODORDER): $(build-dir) 1840 @: 1841 1842# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1843# This is solely useful to speed up test compiles. 1844modules: modpost 1845ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1846 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1847endif 1848 1849PHONY += modules_check 1850modules_check: $(MODORDER) 1851 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1852 1853else # CONFIG_MODULES 1854 1855modules: 1856 @: 1857 1858KBUILD_MODULES := 1859 1860endif # CONFIG_MODULES 1861 1862PHONY += modpost 1863modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1864 $(if $(KBUILD_MODULES), modules_check) 1865 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1866 1867# Single targets 1868# --------------------------------------------------------------------------- 1869# To build individual files in subdirectories, you can do like this: 1870# 1871# make foo/bar/baz.s 1872# 1873# The supported suffixes for single-target are listed in 'single-targets' 1874# 1875# To build only under specific subdirectories, you can do like this: 1876# 1877# make foo/bar/baz/ 1878 1879ifdef single-build 1880 1881# .ko is special because modpost is needed 1882single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1883single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1884 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1885 1886$(single-ko): single_modules 1887 @: 1888$(single-no-ko): $(build-dir) 1889 @: 1890 1891# Remove MODORDER when done because it is not the real one. 1892PHONY += single_modules 1893single_modules: $(single-no-ko) modules_prepare 1894 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1895 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1896ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1897 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1898endif 1899 $(Q)rm -f $(MODORDER) 1900 1901single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1902 1903KBUILD_MODULES := 1 1904 1905endif 1906 1907# Preset locale variables to speed up the build process. Limit locale 1908# tweaks to this spot to avoid wrong language settings when running 1909# make menuconfig etc. 1910# Error messages still appears in the original language 1911PHONY += $(build-dir) 1912$(build-dir): prepare 1913 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1914 1915clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1916PHONY += $(clean-dirs) clean 1917$(clean-dirs): 1918 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1919 1920clean: $(clean-dirs) 1921 $(call cmd,rmfiles) 1922 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1923 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1924 -o -name '*.ko.*' \ 1925 -o -name '*.dtb' -o -name '*.dtbo' \ 1926 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1927 -o -name '*.dt.yaml' \ 1928 -o -name '*.dwo' -o -name '*.lst' \ 1929 -o -name '*.su' -o -name '*.mod' \ 1930 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1931 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1932 -o -name '*.asn1.[ch]' \ 1933 -o -name '*.symtypes' -o -name 'modules.order' \ 1934 -o -name '*.c.[012]*.*' \ 1935 -o -name '*.ll' \ 1936 -o -name '*.gcno' \ 1937 -o -name '*.*.symversions' \) -type f -print \ 1938 -o -name '.tmp_*' -print \ 1939 | xargs rm -rf 1940 1941# Generate tags for editors 1942# --------------------------------------------------------------------------- 1943quiet_cmd_tags = GEN $@ 1944 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1945 1946tags TAGS cscope gtags: FORCE 1947 $(call cmd,tags) 1948 1949# IDE support targets 1950PHONY += rust-analyzer 1951rust-analyzer: 1952 $(Q)$(MAKE) $(build)=rust $@ 1953 1954# Script to generate missing namespace dependencies 1955# --------------------------------------------------------------------------- 1956 1957PHONY += nsdeps 1958nsdeps: export KBUILD_NSDEPS=1 1959nsdeps: modules 1960 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1961 1962# Clang Tooling 1963# --------------------------------------------------------------------------- 1964 1965quiet_cmd_gen_compile_commands = GEN $@ 1966 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1967 1968$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1969 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1970 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1971 $(call if_changed,gen_compile_commands) 1972 1973targets += $(extmod_prefix)compile_commands.json 1974 1975PHONY += clang-tidy clang-analyzer 1976 1977ifdef CONFIG_CC_IS_CLANG 1978quiet_cmd_clang_tools = CHECK $< 1979 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1980 1981clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1982 $(call cmd,clang_tools) 1983else 1984clang-tidy clang-analyzer: 1985 @echo "$@ requires CC=clang" >&2 1986 @false 1987endif 1988 1989# Scripts to check various things for consistency 1990# --------------------------------------------------------------------------- 1991 1992PHONY += includecheck versioncheck coccicheck export_report 1993 1994includecheck: 1995 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1996 -name '*.[hcS]' -type f -print | sort \ 1997 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1998 1999versioncheck: 2000 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2001 -name '*.[hcS]' -type f -print | sort \ 2002 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2003 2004coccicheck: 2005 $(Q)$(BASH) $(srctree)/scripts/$@ 2006 2007export_report: 2008 $(PERL) $(srctree)/scripts/export_report.pl 2009 2010PHONY += checkstack kernelrelease kernelversion image_name 2011 2012# UML needs a little special treatment here. It wants to use the host 2013# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2014# else wants $(ARCH), including people doing cross-builds, which means 2015# that $(SUBARCH) doesn't work here. 2016ifeq ($(ARCH), um) 2017CHECKSTACK_ARCH := $(SUBARCH) 2018else 2019CHECKSTACK_ARCH := $(ARCH) 2020endif 2021checkstack: 2022 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2023 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2024 2025kernelrelease: 2026 @$(filechk_kernel.release) 2027 2028kernelversion: 2029 @echo $(KERNELVERSION) 2030 2031image_name: 2032 @echo $(KBUILD_IMAGE) 2033 2034PHONY += run-command 2035run-command: 2036 $(Q)$(KBUILD_RUN_COMMAND) 2037 2038quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2039 cmd_rmfiles = rm -rf $(rm-files) 2040 2041# read saved command lines for existing targets 2042existing-targets := $(wildcard $(sort $(targets))) 2043 2044-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2045 2046endif # config-build 2047endif # mixed-build 2048endif # need-sub-make 2049 2050PHONY += FORCE 2051FORCE: 2052 2053# Declare the contents of the PHONY variable as phony. We keep that 2054# information in a variable so we can use it in if_changed and friends. 2055.PHONY: $(PHONY) 2056
