1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 8 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 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# backward compatibility 159KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 160 161ifeq ("$(origin W)", "command line") 162 KBUILD_EXTRA_WARN := $(W) 163endif 164 165export KBUILD_EXTRA_WARN 166 167# Kbuild will save output files in the current working directory. 168# This does not need to match to the root of the kernel source tree. 169# 170# For example, you can do this: 171# 172# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 173# 174# If you want to save output files in a different location, there are 175# two syntaxes to specify it. 176# 177# 1) O= 178# Use "make O=dir/to/store/output/files/" 179# 180# 2) Set KBUILD_OUTPUT 181# Set the environment variable KBUILD_OUTPUT to point to the output directory. 182# export KBUILD_OUTPUT=dir/to/store/output/files/; make 183# 184# The O= assignment takes precedence over the KBUILD_OUTPUT environment 185# variable. 186 187# Do we want to change the working directory? 188ifeq ("$(origin O)", "command line") 189 KBUILD_OUTPUT := $(O) 190endif 191 192ifneq ($(KBUILD_OUTPUT),) 193# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 194$(shell mkdir -p "$(KBUILD_OUTPUT)") 195# $(realpath ...) resolves symlinks 196abs_objtree := $(realpath $(KBUILD_OUTPUT)) 197$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 198endif # ifneq ($(KBUILD_OUTPUT),) 199 200ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 201$(error source directory cannot contain spaces or colons) 202endif 203 204ifneq ($(filter 3.%,$(MAKE_VERSION)),) 205# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 206# We need to invoke sub-make to avoid implicit rules in the top Makefile. 207need-sub-make := 1 208# Cancel implicit rules for this Makefile. 209$(this-makefile): ; 210endif 211 212export sub_make_done := 1 213 214endif # sub_make_done 215 216ifeq ($(abs_objtree),$(CURDIR)) 217# Suppress "Entering directory ..." if we are at the final work directory. 218no-print-directory := --no-print-directory 219else 220# Recursion to show "Entering directory ..." 221need-sub-make := 1 222endif 223 224ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 225# If --no-print-directory is unset, recurse once again to set it. 226# You may end up recursing into __sub-make twice. This is needed due to the 227# behavior change in GNU Make 4.4.1. 228need-sub-make := 1 229endif 230 231ifeq ($(need-sub-make),1) 232 233PHONY += $(MAKECMDGOALS) __sub-make 234 235$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 236 @: 237 238# Invoke a second make in the output directory, passing relevant variables 239__sub-make: 240 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 241 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 242 243else # need-sub-make 244 245# We process the rest of the Makefile if this is the final invocation of make 246 247ifeq ($(abs_srctree),$(abs_objtree)) 248 # building in the source tree 249 srctree := . 250 building_out_of_srctree := 251else 252 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 253 # building in a subdirectory of the source tree 254 srctree := .. 255 else 256 srctree := $(abs_srctree) 257 endif 258 building_out_of_srctree := 1 259endif 260 261ifneq ($(KBUILD_ABS_SRCTREE),) 262srctree := $(abs_srctree) 263endif 264 265objtree := . 266VPATH := $(srctree) 267 268export building_out_of_srctree srctree objtree VPATH 269 270# To make sure we do not include .config for any of the *config targets 271# catch them early, and hand them over to scripts/kconfig/Makefile 272# It is allowed to specify more targets when calling make, including 273# mixing *config targets and build targets. 274# For example 'make oldconfig all'. 275# Detect when mixed targets is specified, and make a second invocation 276# of make so .config is not included in this case either (for *config). 277 278version_h := include/generated/uapi/linux/version.h 279 280clean-targets := %clean mrproper cleandocs 281no-dot-config-targets := $(clean-targets) \ 282 cscope gtags TAGS tags help% %docs check% coccicheck \ 283 $(version_h) headers headers_% archheaders archscripts \ 284 %asm-generic kernelversion %src-pkg dt_binding_check \ 285 outputmakefile rustavailable rustfmt rustfmtcheck 286no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 287 image_name 288single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 289 290config-build := 291mixed-build := 292need-config := 1 293may-sync-config := 1 294single-build := 295 296ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 297 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 298 need-config := 299 endif 300endif 301 302ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 303 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 304 may-sync-config := 305 endif 306endif 307 308need-compiler := $(may-sync-config) 309 310ifneq ($(KBUILD_EXTMOD),) 311 may-sync-config := 312endif 313 314ifeq ($(KBUILD_EXTMOD),) 315 ifneq ($(filter %config,$(MAKECMDGOALS)),) 316 config-build := 1 317 ifneq ($(words $(MAKECMDGOALS)),1) 318 mixed-build := 1 319 endif 320 endif 321endif 322 323# We cannot build single targets and the others at the same time 324ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 325 single-build := 1 326 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 327 mixed-build := 1 328 endif 329endif 330 331# For "make -j clean all", "make -j mrproper defconfig all", etc. 332ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 333 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 334 mixed-build := 1 335 endif 336endif 337 338# install and modules_install need also be processed one by one 339ifneq ($(filter install,$(MAKECMDGOALS)),) 340 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 341 mixed-build := 1 342 endif 343endif 344 345ifdef mixed-build 346# =========================================================================== 347# We're called with mixed targets (*config and build targets). 348# Handle them one by one. 349 350PHONY += $(MAKECMDGOALS) __build_one_by_one 351 352$(MAKECMDGOALS): __build_one_by_one 353 @: 354 355__build_one_by_one: 356 $(Q)set -e; \ 357 for i in $(MAKECMDGOALS); do \ 358 $(MAKE) -f $(srctree)/Makefile $$i; \ 359 done 360 361else # !mixed-build 362 363include $(srctree)/scripts/Kbuild.include 364 365# Read KERNELRELEASE from include/config/kernel.release (if it exists) 366KERNELRELEASE = $(call read-file, include/config/kernel.release) 367KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 368export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 369 370include $(srctree)/scripts/subarch.include 371 372# Cross compiling and selecting different set of gcc/bin-utils 373# --------------------------------------------------------------------------- 374# 375# When performing cross compilation for other architectures ARCH shall be set 376# to the target architecture. (See arch/* for the possibilities). 377# ARCH can be set during invocation of make: 378# make ARCH=arm64 379# Another way is to have ARCH set in the environment. 380# The default ARCH is the host where make is executed. 381 382# CROSS_COMPILE specify the prefix used for all executables used 383# during compilation. Only gcc and related bin-utils executables 384# are prefixed with $(CROSS_COMPILE). 385# CROSS_COMPILE can be set on the command line 386# make CROSS_COMPILE=aarch64-linux-gnu- 387# Alternatively CROSS_COMPILE can be set in the environment. 388# Default value for CROSS_COMPILE is not to prefix executables 389# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 390ARCH ?= $(SUBARCH) 391 392# Architecture as present in compile.h 393UTS_MACHINE := $(ARCH) 394SRCARCH := $(ARCH) 395 396# Additional ARCH settings for x86 397ifeq ($(ARCH),i386) 398 SRCARCH := x86 399endif 400ifeq ($(ARCH),x86_64) 401 SRCARCH := x86 402endif 403 404# Additional ARCH settings for sparc 405ifeq ($(ARCH),sparc32) 406 SRCARCH := sparc 407endif 408ifeq ($(ARCH),sparc64) 409 SRCARCH := sparc 410endif 411 412# Additional ARCH settings for parisc 413ifeq ($(ARCH),parisc64) 414 SRCARCH := parisc 415endif 416 417export cross_compiling := 418ifneq ($(SRCARCH),$(SUBARCH)) 419cross_compiling := 1 420endif 421 422KCONFIG_CONFIG ?= .config 423export KCONFIG_CONFIG 424 425# SHELL used by kbuild 426CONFIG_SHELL := sh 427 428HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 429HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 430HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 431 432ifneq ($(LLVM),) 433ifneq ($(filter %/,$(LLVM)),) 434LLVM_PREFIX := $(LLVM) 435else ifneq ($(filter -%,$(LLVM)),) 436LLVM_SUFFIX := $(LLVM) 437endif 438 439HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 440HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 441else 442HOSTCC = gcc 443HOSTCXX = g++ 444endif 445HOSTRUSTC = rustc 446HOSTPKG_CONFIG = pkg-config 447 448KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 449 -O2 -fomit-frame-pointer -std=gnu11 450KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 451KBUILD_USERLDFLAGS := $(USERLDFLAGS) 452 453# These flags apply to all Rust code in the tree, including the kernel and 454# host programs. 455export rust_common_flags := --edition=2021 \ 456 -Zbinary_dep_depinfo=y \ 457 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 458 -Dunreachable_pub -Dnon_ascii_idents \ 459 -Wmissing_docs \ 460 -Drustdoc::missing_crate_level_docs \ 461 -Dclippy::correctness -Dclippy::style \ 462 -Dclippy::suspicious -Dclippy::complexity \ 463 -Dclippy::perf \ 464 -Dclippy::let_unit_value -Dclippy::mut_mut \ 465 -Dclippy::needless_bitwise_bool \ 466 -Dclippy::needless_continue \ 467 -Dclippy::no_mangle_with_rust_abi \ 468 -Wclippy::dbg_macro 469 470KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 471KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 472KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 473 -Zallow-features= $(HOSTRUSTFLAGS) 474KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 475KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 476 477# Make variables (CC, etc...) 478CPP = $(CC) -E 479ifneq ($(LLVM),) 480CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 481LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 482AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 483NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 484OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 485OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 486READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 487STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 488else 489CC = $(CROSS_COMPILE)gcc 490LD = $(CROSS_COMPILE)ld 491AR = $(CROSS_COMPILE)ar 492NM = $(CROSS_COMPILE)nm 493OBJCOPY = $(CROSS_COMPILE)objcopy 494OBJDUMP = $(CROSS_COMPILE)objdump 495READELF = $(CROSS_COMPILE)readelf 496STRIP = $(CROSS_COMPILE)strip 497endif 498RUSTC = rustc 499RUSTDOC = rustdoc 500RUSTFMT = rustfmt 501CLIPPY_DRIVER = clippy-driver 502BINDGEN = bindgen 503CARGO = cargo 504PAHOLE = pahole 505RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 506LEX = flex 507YACC = bison 508AWK = awk 509INSTALLKERNEL := installkernel 510PERL = perl 511PYTHON3 = python3 512CHECK = sparse 513BASH = bash 514KGZIP = gzip 515KBZIP2 = bzip2 516KLZOP = lzop 517LZMA = lzma 518LZ4 = lz4c 519XZ = xz 520ZSTD = zstd 521 522CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 523 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 524NOSTDINC_FLAGS := 525CFLAGS_MODULE = 526RUSTFLAGS_MODULE = 527AFLAGS_MODULE = 528LDFLAGS_MODULE = 529CFLAGS_KERNEL = 530RUSTFLAGS_KERNEL = 531AFLAGS_KERNEL = 532LDFLAGS_vmlinux = 533 534# Use USERINCLUDE when you must reference the UAPI directories only. 535USERINCLUDE := \ 536 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 537 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 538 -I$(srctree)/include/uapi \ 539 -I$(objtree)/include/generated/uapi \ 540 -include $(srctree)/include/linux/compiler-version.h \ 541 -include $(srctree)/include/linux/kconfig.h 542 543# Use LINUXINCLUDE when you must reference the include/ directory. 544# Needed to be compatible with the O= option 545LINUXINCLUDE := \ 546 -I$(srctree)/arch/$(SRCARCH)/include \ 547 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 548 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 549 -I$(objtree)/include \ 550 $(USERINCLUDE) 551 552KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 553 554KBUILD_CFLAGS := 555KBUILD_CFLAGS += -std=gnu11 556KBUILD_CFLAGS += -fshort-wchar 557KBUILD_CFLAGS += -funsigned-char 558KBUILD_CFLAGS += -fno-common 559KBUILD_CFLAGS += -fno-PIE 560KBUILD_CFLAGS += -fno-strict-aliasing 561 562KBUILD_CPPFLAGS := -D__KERNEL__ 563KBUILD_RUSTFLAGS := $(rust_common_flags) \ 564 --target=$(objtree)/scripts/target.json \ 565 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 566 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 567 -Csymbol-mangling-version=v0 \ 568 -Crelocation-model=static \ 569 -Zfunction-sections=n \ 570 -Dclippy::float_arithmetic 571 572KBUILD_AFLAGS_KERNEL := 573KBUILD_CFLAGS_KERNEL := 574KBUILD_RUSTFLAGS_KERNEL := 575KBUILD_AFLAGS_MODULE := -DMODULE 576KBUILD_CFLAGS_MODULE := -DMODULE 577KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 578KBUILD_LDFLAGS_MODULE := 579KBUILD_LDFLAGS := 580CLANG_FLAGS := 581 582ifeq ($(KBUILD_CLIPPY),1) 583 RUSTC_OR_CLIPPY_QUIET := CLIPPY 584 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 585else 586 RUSTC_OR_CLIPPY_QUIET := RUSTC 587 RUSTC_OR_CLIPPY = $(RUSTC) 588endif 589 590ifdef RUST_LIB_SRC 591 export RUST_LIB_SRC 592endif 593 594# Allows the usage of unstable features in stable compilers. 595export RUSTC_BOOTSTRAP := 1 596 597export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 598export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 599export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 600export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 601export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 602export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 603export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 604export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 605 606export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 607export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 608export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 609export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 610export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 611export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 612 613# Files to ignore in find ... statements 614 615export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 616 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 617 -prune -o 618 619# =========================================================================== 620# Rules shared between *config targets and build targets 621 622# Basic helpers built in scripts/basic/ 623PHONY += scripts_basic 624scripts_basic: 625 $(Q)$(MAKE) $(build)=scripts/basic 626 627PHONY += outputmakefile 628ifdef building_out_of_srctree 629# Before starting out-of-tree build, make sure the source tree is clean. 630# outputmakefile generates a Makefile in the output directory, if using a 631# separate output directory. This allows convenient use of make in the 632# output directory. 633# At the same time when output Makefile generated, generate .gitignore to 634# ignore whole output directory 635 636quiet_cmd_makefile = GEN Makefile 637 cmd_makefile = { \ 638 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 639 echo "include $(srctree)/Makefile"; \ 640 } > Makefile 641 642outputmakefile: 643 @if [ -f $(srctree)/.config -o \ 644 -d $(srctree)/include/config -o \ 645 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 646 echo >&2 "***"; \ 647 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 648 echo >&2 "*** in $(abs_srctree)";\ 649 echo >&2 "***"; \ 650 false; \ 651 fi 652 $(Q)ln -fsn $(srctree) source 653 $(call cmd,makefile) 654 $(Q)test -e .gitignore || \ 655 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 656endif 657 658# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 659# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 660# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 661# and from include/config/auto.conf.cmd to detect the compiler upgrade. 662CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 663 664ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 665include $(srctree)/scripts/Makefile.clang 666endif 667 668# Include this also for config targets because some architectures need 669# cc-cross-prefix to determine CROSS_COMPILE. 670ifdef need-compiler 671include $(srctree)/scripts/Makefile.compiler 672endif 673 674ifdef config-build 675# =========================================================================== 676# *config targets only - make sure prerequisites are updated, and descend 677# in scripts/kconfig to make the *config target 678 679# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 680# KBUILD_DEFCONFIG may point out an alternative default configuration 681# used for 'make defconfig' 682include $(srctree)/arch/$(SRCARCH)/Makefile 683export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 684 685config: outputmakefile scripts_basic FORCE 686 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 687 688%config: outputmakefile scripts_basic FORCE 689 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 690 691else #!config-build 692# =========================================================================== 693# Build targets only - this includes vmlinux, arch-specific targets, clean 694# targets and others. In general all targets except *config targets. 695 696# If building an external module we do not care about the all: rule 697# but instead __all depend on modules 698PHONY += all 699ifeq ($(KBUILD_EXTMOD),) 700__all: all 701else 702__all: modules 703endif 704 705targets := 706 707# Decide whether to build built-in, modular, or both. 708# Normally, just do built-in. 709 710KBUILD_MODULES := 711KBUILD_BUILTIN := 1 712 713# If we have only "make modules", don't compile built-in objects. 714ifeq ($(MAKECMDGOALS),modules) 715 KBUILD_BUILTIN := 716endif 717 718# If we have "make <whatever> modules", compile modules 719# in addition to whatever we do anyway. 720# Just "make" or "make all" shall build modules as well 721 722ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 723 KBUILD_MODULES := 1 724endif 725 726ifeq ($(MAKECMDGOALS),) 727 KBUILD_MODULES := 1 728endif 729 730export KBUILD_MODULES KBUILD_BUILTIN 731 732ifdef need-config 733include include/config/auto.conf 734endif 735 736ifeq ($(KBUILD_EXTMOD),) 737# Objects we will link into vmlinux / subdirs we need to visit 738core-y := 739drivers-y := 740libs-y := lib/ 741endif # KBUILD_EXTMOD 742 743# The all: target is the default when no target is given on the 744# command line. 745# This allow a user to issue only 'make' to build a kernel including modules 746# Defaults to vmlinux, but the arch makefile usually adds further targets 747all: vmlinux 748 749CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 750ifdef CONFIG_CC_IS_GCC 751CFLAGS_GCOV += -fno-tree-loop-im 752endif 753export CFLAGS_GCOV 754 755# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 756ifdef CONFIG_FUNCTION_TRACER 757 CC_FLAGS_FTRACE := -pg 758endif 759 760include $(srctree)/arch/$(SRCARCH)/Makefile 761 762ifdef need-config 763ifdef may-sync-config 764# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 765# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 766# because some architectures define CROSS_COMPILE there. 767include include/config/auto.conf.cmd 768 769$(KCONFIG_CONFIG): 770 @echo >&2 '***' 771 @echo >&2 '*** Configuration file "$@" not found!' 772 @echo >&2 '***' 773 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 774 @echo >&2 '*** "make menuconfig" or "make xconfig").' 775 @echo >&2 '***' 776 @/bin/false 777 778# The actual configuration files used during the build are stored in 779# include/generated/ and include/config/. Update them if .config is newer than 780# include/config/auto.conf (which mirrors .config). 781# 782# This exploits the 'multi-target pattern rule' trick. 783# The syncconfig should be executed only once to make all the targets. 784# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 785# 786# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 787# so you cannot notice that Kconfig is waiting for the user input. 788%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 789 $(Q)$(kecho) " SYNC $@" 790 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 791else # !may-sync-config 792# External modules and some install targets need include/generated/autoconf.h 793# and include/config/auto.conf but do not care if they are up-to-date. 794# Use auto.conf to trigger the test 795PHONY += include/config/auto.conf 796 797include/config/auto.conf: 798 @test -e include/generated/autoconf.h -a -e $@ || ( \ 799 echo >&2; \ 800 echo >&2 " ERROR: Kernel configuration is invalid."; \ 801 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 802 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 803 echo >&2 ; \ 804 /bin/false) 805 806endif # may-sync-config 807endif # need-config 808 809KBUILD_CFLAGS += -fno-delete-null-pointer-checks 810 811ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 812KBUILD_CFLAGS += -O2 813KBUILD_RUSTFLAGS += -Copt-level=2 814else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 815KBUILD_CFLAGS += -Os 816KBUILD_RUSTFLAGS += -Copt-level=s 817endif 818 819# Always set `debug-assertions` and `overflow-checks` because their default 820# depends on `opt-level` and `debug-assertions`, respectively. 821KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 822KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 823 824# Tell gcc to never replace conditional load with a non-conditional one 825ifdef CONFIG_CC_IS_GCC 826# gcc-10 renamed --param=allow-store-data-races=0 to 827# -fno-allow-store-data-races. 828KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 829KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 830endif 831 832ifdef CONFIG_READABLE_ASM 833# Disable optimizations that make assembler listings hard to read. 834# reorder blocks reorders the control in the function 835# ipa clone creates specialized cloned functions 836# partial inlining inlines only parts of functions 837KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 838endif 839 840stackp-flags-y := -fno-stack-protector 841stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 842stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 843 844KBUILD_CFLAGS += $(stackp-flags-y) 845 846KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 847KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 848 849ifdef CONFIG_FRAME_POINTER 850KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 851KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 852else 853# Some targets (ARM with Thumb2, for example), can't be built with frame 854# pointers. For those, we don't have FUNCTION_TRACER automatically 855# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 856# incompatible with -fomit-frame-pointer with current GCC, so we don't use 857# -fomit-frame-pointer with FUNCTION_TRACER. 858# In the Rust target specification, "frame-pointer" is set explicitly 859# to "may-omit". 860ifndef CONFIG_FUNCTION_TRACER 861KBUILD_CFLAGS += -fomit-frame-pointer 862endif 863endif 864 865# Initialize all stack variables with a 0xAA pattern. 866ifdef CONFIG_INIT_STACK_ALL_PATTERN 867KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 868endif 869 870# Initialize all stack variables with a zero value. 871ifdef CONFIG_INIT_STACK_ALL_ZERO 872KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 873ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 874# https://github.com/llvm/llvm-project/issues/44842 875CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 876export CC_AUTO_VAR_INIT_ZERO_ENABLER 877KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 878endif 879endif 880 881# While VLAs have been removed, GCC produces unreachable stack probes 882# for the randomize_kstack_offset feature. Disable it for all compilers. 883KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 884 885# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 886ifdef CONFIG_ZERO_CALL_USED_REGS 887KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 888endif 889 890ifdef CONFIG_FUNCTION_TRACER 891ifdef CONFIG_FTRACE_MCOUNT_USE_CC 892 CC_FLAGS_FTRACE += -mrecord-mcount 893 ifdef CONFIG_HAVE_NOP_MCOUNT 894 ifeq ($(call cc-option-yn, -mnop-mcount),y) 895 CC_FLAGS_FTRACE += -mnop-mcount 896 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 897 endif 898 endif 899endif 900ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 901 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 902 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 903 endif 904endif 905ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 906 ifdef CONFIG_HAVE_C_RECORDMCOUNT 907 BUILD_C_RECORDMCOUNT := y 908 export BUILD_C_RECORDMCOUNT 909 endif 910endif 911ifdef CONFIG_HAVE_FENTRY 912 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 913 ifeq ($(call cc-option-yn, -mfentry),y) 914 CC_FLAGS_FTRACE += -mfentry 915 CC_FLAGS_USING += -DCC_USING_FENTRY 916 endif 917endif 918export CC_FLAGS_FTRACE 919KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 920KBUILD_AFLAGS += $(CC_FLAGS_USING) 921endif 922 923# We trigger additional mismatches with less inlining 924ifdef CONFIG_DEBUG_SECTION_MISMATCH 925KBUILD_CFLAGS += -fno-inline-functions-called-once 926endif 927 928# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 929ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 930KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 931KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 932LDFLAGS_vmlinux += --gc-sections 933endif 934 935ifdef CONFIG_SHADOW_CALL_STACK 936ifndef CONFIG_DYNAMIC_SCS 937CC_FLAGS_SCS := -fsanitize=shadow-call-stack 938KBUILD_CFLAGS += $(CC_FLAGS_SCS) 939endif 940export CC_FLAGS_SCS 941endif 942 943ifdef CONFIG_LTO_CLANG 944ifdef CONFIG_LTO_CLANG_THIN 945CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 946KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 947else 948CC_FLAGS_LTO := -flto 949endif 950CC_FLAGS_LTO += -fvisibility=hidden 951 952# Limit inlining across translation units to reduce binary size 953KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 954 955# Check for frame size exceeding threshold during prolog/epilog insertion 956# when using lld < 13.0.0. 957ifneq ($(CONFIG_FRAME_WARN),0) 958ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 959KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 960endif 961endif 962endif 963 964ifdef CONFIG_LTO 965KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 966KBUILD_AFLAGS += -fno-lto 967export CC_FLAGS_LTO 968endif 969 970ifdef CONFIG_CFI_CLANG 971CC_FLAGS_CFI := -fsanitize=kcfi 972KBUILD_CFLAGS += $(CC_FLAGS_CFI) 973export CC_FLAGS_CFI 974endif 975 976ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 977KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 978endif 979 980# arch Makefile may override CC so keep this after arch Makefile is included 981NOSTDINC_FLAGS += -nostdinc 982 983# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 984# the kernel uses only C99 flexible arrays for dynamically sized trailing 985# arrays. Enforce this for everything that may examine structure sizes and 986# perform bounds checking. 987KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 988 989# disable invalid "can't wrap" optimizations for signed / pointers 990KBUILD_CFLAGS += -fno-strict-overflow 991 992# Make sure -fstack-check isn't enabled (like gentoo apparently did) 993KBUILD_CFLAGS += -fno-stack-check 994 995# conserve stack if available 996ifdef CONFIG_CC_IS_GCC 997KBUILD_CFLAGS += -fconserve-stack 998endif 999 1000# change __FILE__ to the relative path from the srctree 1001KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1002 1003# include additional Makefiles when needed 1004include-y := scripts/Makefile.extrawarn 1005include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1006include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1007include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1008include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1009include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1010include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1011include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1012include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1013include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1014 1015include $(addprefix $(srctree)/, $(include-y)) 1016 1017# scripts/Makefile.gcc-plugins is intentionally included last. 1018# Do not add $(call cc-option,...) below this line. When you build the kernel 1019# from the clean source tree, the GCC plugins do not exist at this point. 1020 1021# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1022KBUILD_CPPFLAGS += $(KCPPFLAGS) 1023KBUILD_AFLAGS += $(KAFLAGS) 1024KBUILD_CFLAGS += $(KCFLAGS) 1025KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1026 1027KBUILD_LDFLAGS_MODULE += --build-id=sha1 1028LDFLAGS_vmlinux += --build-id=sha1 1029 1030KBUILD_LDFLAGS += -z noexecstack 1031ifeq ($(CONFIG_LD_IS_BFD),y) 1032KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1033endif 1034 1035ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1036LDFLAGS_vmlinux += -X 1037endif 1038 1039ifeq ($(CONFIG_RELR),y) 1040# ld.lld before 15 did not support -z pack-relative-relocs. 1041LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1042endif 1043 1044# We never want expected sections to be placed heuristically by the 1045# linker. All sections should be explicitly named in the linker script. 1046ifdef CONFIG_LD_ORPHAN_WARN 1047LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1048endif 1049 1050# Align the bit size of userspace programs with the kernel 1051KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1052KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1053 1054# make the checker run with the right architecture 1055CHECKFLAGS += --arch=$(ARCH) 1056 1057# insure the checker run with the right endianness 1058CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1059 1060# the checker needs the correct machine size 1061CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1062 1063# Default kernel image to build when no specific target is given. 1064# KBUILD_IMAGE may be overruled on the command line or 1065# set in the environment 1066# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1067# this default value 1068export KBUILD_IMAGE ?= vmlinux 1069 1070# 1071# INSTALL_PATH specifies where to place the updated kernel and system map 1072# images. Default is /boot, but you can set it to other values 1073export INSTALL_PATH ?= /boot 1074 1075# 1076# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1077# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1078# an argument if needed. Otherwise it defaults to the kernel install path 1079# 1080export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1081 1082# 1083# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1084# relocations required by build roots. This is not defined in the 1085# makefile but the argument can be passed to make if needed. 1086# 1087 1088MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1089export MODLIB 1090 1091PHONY += prepare0 1092 1093export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1094export MODORDER := $(extmod_prefix)modules.order 1095export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1096 1097ifeq ($(KBUILD_EXTMOD),) 1098 1099build-dir := . 1100clean-dirs := $(sort . Documentation \ 1101 $(patsubst %/,%,$(filter %/, $(core-) \ 1102 $(drivers-) $(libs-)))) 1103 1104export ARCH_CORE := $(core-y) 1105export ARCH_LIB := $(filter %/, $(libs-y)) 1106export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1107# Externally visible symbols (used by link-vmlinux.sh) 1108 1109KBUILD_VMLINUX_OBJS := ./built-in.a 1110ifdef CONFIG_MODULES 1111KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1112KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1113else 1114KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1115endif 1116 1117export KBUILD_VMLINUX_LIBS 1118export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1119 1120ifdef CONFIG_TRIM_UNUSED_KSYMS 1121# For the kernel to actually contain only the needed exported symbols, 1122# we have to build modules as well to determine what those symbols are. 1123KBUILD_MODULES := 1 1124endif 1125 1126# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1127quiet_cmd_ar_vmlinux.a = AR $@ 1128 cmd_ar_vmlinux.a = \ 1129 rm -f $@; \ 1130 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1131 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1132 1133targets += vmlinux.a 1134vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1135 $(call if_changed,ar_vmlinux.a) 1136 1137PHONY += vmlinux_o 1138vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1140 1141vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1142 @: 1143 1144PHONY += vmlinux 1145# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1146# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1147# unrelated; the decompressors just happen to have the same base name, 1148# arch/*/boot/compressed/vmlinux. 1149# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1150# 1151# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1152# https://savannah.gnu.org/bugs/?61463 1153# For Make > 4.4, the following simple code will work: 1154# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1155vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1156vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1157vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1158 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1159 1160# The actual objects are generated when descending, 1161# make sure no implicit rule kicks in 1162$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1163 1164ifeq ($(origin KERNELRELEASE),file) 1165filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1166else 1167filechk_kernel.release = echo $(KERNELRELEASE) 1168endif 1169 1170# Store (new) KERNELRELEASE string in include/config/kernel.release 1171include/config/kernel.release: FORCE 1172 $(call filechk,kernel.release) 1173 1174# Additional helpers built in scripts/ 1175# Carefully list dependencies so we do not try to build scripts twice 1176# in parallel 1177PHONY += scripts 1178scripts: scripts_basic scripts_dtc 1179 $(Q)$(MAKE) $(build)=$(@) 1180 1181# Things we need to do before we recursively start building the kernel 1182# or the modules are listed in "prepare". 1183# A multi level approach is used. prepareN is processed before prepareN-1. 1184# archprepare is used in arch Makefiles and when processed asm symlink, 1185# version.h and scripts_basic is processed / created. 1186 1187PHONY += prepare archprepare 1188 1189archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1190 asm-generic $(version_h) include/generated/utsrelease.h \ 1191 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1192 1193prepare0: archprepare 1194 $(Q)$(MAKE) $(build)=scripts/mod 1195 $(Q)$(MAKE) $(build)=. prepare 1196 1197# All the preparing.. 1198prepare: prepare0 1199ifdef CONFIG_RUST 1200 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1201 $(Q)$(MAKE) $(build)=rust 1202endif 1203 1204PHONY += remove-stale-files 1205remove-stale-files: 1206 $(Q)$(srctree)/scripts/remove-stale-files 1207 1208# Support for using generic headers in asm-generic 1209asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1210 1211PHONY += asm-generic uapi-asm-generic 1212asm-generic: uapi-asm-generic 1213 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1214 generic=include/asm-generic 1215uapi-asm-generic: 1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1217 generic=include/uapi/asm-generic 1218 1219# Generate some files 1220# --------------------------------------------------------------------------- 1221 1222# KERNELRELEASE can change from a few different places, meaning version.h 1223# needs to be updated, so this check is forced on all builds 1224 1225uts_len := 64 1226define filechk_utsrelease.h 1227 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1228 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1229 exit 1; \ 1230 fi; \ 1231 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1232endef 1233 1234define filechk_version.h 1235 if [ $(SUBLEVEL) -gt 255 ]; then \ 1236 echo \#define LINUX_VERSION_CODE $(shell \ 1237 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1238 else \ 1239 echo \#define LINUX_VERSION_CODE $(shell \ 1240 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1241 fi; \ 1242 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1243 ((c) > 255 ? 255 : (c)))'; \ 1244 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1245 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1246 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1247endef 1248 1249$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1250$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1251$(version_h): FORCE 1252 $(call filechk,version.h) 1253 1254include/generated/utsrelease.h: include/config/kernel.release FORCE 1255 $(call filechk,utsrelease.h) 1256 1257filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1258 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1259 1260include/generated/compile.h: FORCE 1261 $(call filechk,compile.h) 1262 1263PHONY += headerdep 1264headerdep: 1265 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1266 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1267 1268# --------------------------------------------------------------------------- 1269# Kernel headers 1270 1271#Default location for installed headers 1272export INSTALL_HDR_PATH = $(objtree)/usr 1273 1274quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1275 cmd_headers_install = \ 1276 mkdir -p $(INSTALL_HDR_PATH); \ 1277 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1278 usr/include $(INSTALL_HDR_PATH) 1279 1280PHONY += headers_install 1281headers_install: headers 1282 $(call cmd,headers_install) 1283 1284PHONY += archheaders archscripts 1285 1286hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1287 1288PHONY += headers 1289headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1290 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1291 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1292 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1293 1294ifdef CONFIG_HEADERS_INSTALL 1295prepare: headers 1296endif 1297 1298PHONY += scripts_unifdef 1299scripts_unifdef: scripts_basic 1300 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1301 1302# --------------------------------------------------------------------------- 1303# Install 1304 1305# Many distributions have the custom install script, /sbin/installkernel. 1306# If DKMS is installed, 'make install' will eventually recurse back 1307# to this Makefile to build and install external modules. 1308# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1309 1310quiet_cmd_install = INSTALL $(INSTALL_PATH) 1311 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1312 1313# --------------------------------------------------------------------------- 1314# vDSO install 1315 1316PHONY += vdso_install 1317vdso_install: export INSTALL_FILES = $(vdso-install-y) 1318vdso_install: 1319 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1320 1321# --------------------------------------------------------------------------- 1322# Tools 1323 1324ifdef CONFIG_OBJTOOL 1325prepare: tools/objtool 1326endif 1327 1328ifdef CONFIG_BPF 1329ifdef CONFIG_DEBUG_INFO_BTF 1330prepare: tools/bpf/resolve_btfids 1331endif 1332endif 1333 1334PHONY += resolve_btfids_clean 1335 1336resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1337 1338# tools/bpf/resolve_btfids directory might not exist 1339# in output directory, skip its clean in that case 1340resolve_btfids_clean: 1341ifneq ($(wildcard $(resolve_btfids_O)),) 1342 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1343endif 1344 1345# Clear a bunch of variables before executing the submake 1346ifeq ($(quiet),silent_) 1347tools_silent=s 1348endif 1349 1350tools/: FORCE 1351 $(Q)mkdir -p $(objtree)/tools 1352 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1353 1354tools/%: FORCE 1355 $(Q)mkdir -p $(objtree)/tools 1356 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1357 1358# --------------------------------------------------------------------------- 1359# Kernel selftest 1360 1361PHONY += kselftest 1362kselftest: headers 1363 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1364 1365kselftest-%: headers FORCE 1366 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1367 1368PHONY += kselftest-merge 1369kselftest-merge: 1370 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1371 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1372 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1373 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1374 1375# --------------------------------------------------------------------------- 1376# Devicetree files 1377 1378ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1379dtstree := arch/$(SRCARCH)/boot/dts 1380endif 1381 1382ifneq ($(dtstree),) 1383 1384%.dtb: dtbs_prepare 1385 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1386 1387%.dtbo: dtbs_prepare 1388 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1389 1390PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1391dtbs: dtbs_prepare 1392 $(Q)$(MAKE) $(build)=$(dtstree) 1393 1394# include/config/kernel.release is actually needed when installing DTBs because 1395# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1396# dtbs_install depend on it as dtbs_install may run as root. 1397dtbs_prepare: include/config/kernel.release scripts_dtc 1398 1399ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1400export CHECK_DTBS=y 1401endif 1402 1403ifneq ($(CHECK_DTBS),) 1404dtbs_prepare: dt_binding_check 1405endif 1406 1407dtbs_check: dtbs 1408 1409dtbs_install: 1410 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1411 1412ifdef CONFIG_OF_EARLY_FLATTREE 1413all: dtbs 1414endif 1415 1416endif 1417 1418PHONY += scripts_dtc 1419scripts_dtc: scripts_basic 1420 $(Q)$(MAKE) $(build)=scripts/dtc 1421 1422ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1423export CHECK_DT_BINDING=y 1424endif 1425 1426PHONY += dt_binding_check 1427dt_binding_check: scripts_dtc 1428 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1429 1430PHONY += dt_compatible_check 1431dt_compatible_check: dt_binding_check 1432 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1433 1434# --------------------------------------------------------------------------- 1435# Modules 1436 1437ifdef CONFIG_MODULES 1438 1439# By default, build modules as well 1440 1441all: modules 1442 1443# When we're building modules with modversions, we need to consider 1444# the built-in objects during the descend as well, in order to 1445# make sure the checksums are up to date before we record them. 1446ifdef CONFIG_MODVERSIONS 1447 KBUILD_BUILTIN := 1 1448endif 1449 1450# Build modules 1451# 1452 1453# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1454# is an exception. 1455ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1456KBUILD_BUILTIN := 1 1457modules: vmlinux 1458endif 1459 1460modules: modules_prepare 1461 1462# Target to prepare building external modules 1463modules_prepare: prepare 1464 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1465 1466endif # CONFIG_MODULES 1467 1468### 1469# Cleaning is done on three levels. 1470# make clean Delete most generated files 1471# Leave enough to build external modules 1472# make mrproper Delete the current configuration, and all generated files 1473# make distclean Remove editor backup files, patch leftover files and the like 1474 1475# Directories & files removed with 'make clean' 1476CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1477 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1478 compile_commands.json .thinlto-cache rust/test \ 1479 rust-project.json .vmlinux.objs .vmlinux.export.c 1480 1481# Directories & files removed with 'make mrproper' 1482MRPROPER_FILES += include/config include/generated \ 1483 arch/$(SRCARCH)/include/generated .objdiff \ 1484 debian snap tar-install \ 1485 .config .config.old .version \ 1486 Module.symvers \ 1487 certs/signing_key.pem \ 1488 certs/x509.genkey \ 1489 vmlinux-gdb.py \ 1490 rpmbuild \ 1491 rust/libmacros.so 1492 1493# clean - Delete most, but leave enough to build external modules 1494# 1495clean: rm-files := $(CLEAN_FILES) 1496 1497PHONY += archclean vmlinuxclean 1498 1499vmlinuxclean: 1500 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1501 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1502 1503clean: archclean vmlinuxclean resolve_btfids_clean 1504 1505# mrproper - Delete all generated files, including .config 1506# 1507mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1508mrproper-dirs := $(addprefix _mrproper_,scripts) 1509 1510PHONY += $(mrproper-dirs) mrproper 1511$(mrproper-dirs): 1512 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1513 1514mrproper: clean $(mrproper-dirs) 1515 $(call cmd,rmfiles) 1516 @find . $(RCS_FIND_IGNORE) \ 1517 \( -name '*.rmeta' \) \ 1518 -type f -print | xargs rm -f 1519 1520# distclean 1521# 1522PHONY += distclean 1523 1524distclean: mrproper 1525 @find . $(RCS_FIND_IGNORE) \ 1526 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1527 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1528 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1529 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1530 -type f -print | xargs rm -f 1531 1532 1533# Packaging of the kernel to various formats 1534# --------------------------------------------------------------------------- 1535 1536%src-pkg: FORCE 1537 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1538%pkg: include/config/kernel.release FORCE 1539 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1540 1541# Brief documentation of the typical targets used 1542# --------------------------------------------------------------------------- 1543 1544boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1545boards := $(sort $(notdir $(boards))) 1546board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1547board-dirs := $(sort $(notdir $(board-dirs:/=))) 1548 1549PHONY += help 1550help: 1551 @echo 'Cleaning targets:' 1552 @echo ' clean - Remove most generated files but keep the config and' 1553 @echo ' enough build support to build external modules' 1554 @echo ' mrproper - Remove all generated files + config + various backup files' 1555 @echo ' distclean - mrproper + remove editor backup and patch files' 1556 @echo '' 1557 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1558 @echo '' 1559 @echo 'Other generic targets:' 1560 @echo ' all - Build all targets marked with [*]' 1561 @echo '* vmlinux - Build the bare kernel' 1562 @echo '* modules - Build all modules' 1563 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1564 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1565 @echo ' dir/ - Build all files in dir and below' 1566 @echo ' dir/file.[ois] - Build specified target only' 1567 @echo ' dir/file.ll - Build the LLVM assembly file' 1568 @echo ' (requires compiler support for LLVM assembly generation)' 1569 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1570 @echo ' (requires a recent binutils and recent build (System.map))' 1571 @echo ' dir/file.ko - Build module including final link' 1572 @echo ' modules_prepare - Set up for building external modules' 1573 @echo ' tags/TAGS - Generate tags file for editors' 1574 @echo ' cscope - Generate cscope index' 1575 @echo ' gtags - Generate GNU GLOBAL index' 1576 @echo ' kernelrelease - Output the release version string (use with make -s)' 1577 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1578 @echo ' image_name - Output the image name (use with make -s)' 1579 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1580 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1581 echo '' 1582 @echo 'Static analysers:' 1583 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1584 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1585 @echo ' versioncheck - Sanity check on version.h usage' 1586 @echo ' includecheck - Check for duplicate included header files' 1587 @echo ' export_report - List the usages of all exported symbols' 1588 @echo ' headerdep - Detect inclusion cycles in headers' 1589 @echo ' coccicheck - Check with Coccinelle' 1590 @echo ' clang-analyzer - Check with clang static analyzer' 1591 @echo ' clang-tidy - Check with clang-tidy' 1592 @echo '' 1593 @echo 'Tools:' 1594 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1595 @echo '' 1596 @echo 'Kernel selftest:' 1597 @echo ' kselftest - Build and run kernel selftest' 1598 @echo ' Build, install, and boot kernel before' 1599 @echo ' running kselftest on it' 1600 @echo ' Run as root for full coverage' 1601 @echo ' kselftest-all - Build kernel selftest' 1602 @echo ' kselftest-install - Build and install kernel selftest' 1603 @echo ' kselftest-clean - Remove all generated kselftest files' 1604 @echo ' kselftest-merge - Merge all the config dependencies of' 1605 @echo ' kselftest to existing .config.' 1606 @echo '' 1607 @echo 'Rust targets:' 1608 @echo ' rustavailable - Checks whether the Rust toolchain is' 1609 @echo ' available and, if not, explains why.' 1610 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1611 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1612 @echo ' is formatted, printing a diff otherwise.' 1613 @echo ' rustdoc - Generate Rust documentation' 1614 @echo ' (requires kernel .config)' 1615 @echo ' rusttest - Runs the Rust tests' 1616 @echo ' (requires kernel .config; downloads external repos)' 1617 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1618 @echo ' (requires kernel .config)' 1619 @echo ' dir/file.[os] - Build specified target only' 1620 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1621 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1622 @echo ' The output is not intended to be compilable.' 1623 @echo ' dir/file.ll - Build the LLVM assembly file' 1624 @echo '' 1625 @$(if $(dtstree), \ 1626 echo 'Devicetree:'; \ 1627 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1628 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1629 echo ' dt_binding_check - Validate device tree binding documents'; \ 1630 echo ' dtbs_check - Validate device tree source files';\ 1631 echo '') 1632 1633 @echo 'Userspace tools targets:' 1634 @echo ' use "make tools/help"' 1635 @echo ' or "cd tools; make help"' 1636 @echo '' 1637 @echo 'Kernel packaging:' 1638 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1639 @echo '' 1640 @echo 'Documentation targets:' 1641 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1642 @echo '' 1643 @echo 'Architecture-specific targets ($(SRCARCH)):' 1644 @$(or $(archhelp),\ 1645 echo ' No architecture-specific help defined for $(SRCARCH)') 1646 @echo '' 1647 @$(if $(boards), \ 1648 $(foreach b, $(boards), \ 1649 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1650 echo '') 1651 @$(if $(board-dirs), \ 1652 $(foreach b, $(board-dirs), \ 1653 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1654 printf " %-16s - Show all of the above\\n" help-boards; \ 1655 echo '') 1656 1657 @echo ' make V=n [targets] 1: verbose build' 1658 @echo ' 2: give reason for rebuild of target' 1659 @echo ' V=1 and V=2 can be combined with V=12' 1660 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1661 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1662 @echo ' (sparse by default)' 1663 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1664 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1665 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1666 @echo ' 1: warnings which may be relevant and do not occur too often' 1667 @echo ' 2: warnings which occur quite often but may still be relevant' 1668 @echo ' 3: more obscure warnings, can most likely be ignored' 1669 @echo ' c: extra checks in the configuration stage (Kconfig)' 1670 @echo ' e: warnings are being treated as errors' 1671 @echo ' Multiple levels can be combined with W=12 or W=123' 1672 @$(if $(dtstree), \ 1673 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1674 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1675 ) 1676 @echo '' 1677 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1678 @echo 'For further info see the ./README file' 1679 1680 1681help-board-dirs := $(addprefix help-,$(board-dirs)) 1682 1683help-boards: $(help-board-dirs) 1684 1685boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1686 1687$(help-board-dirs): help-%: 1688 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1689 @$(if $(boards-per-dir), \ 1690 $(foreach b, $(boards-per-dir), \ 1691 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1692 echo '') 1693 1694 1695# Documentation targets 1696# --------------------------------------------------------------------------- 1697DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1698 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1699PHONY += $(DOC_TARGETS) 1700$(DOC_TARGETS): 1701 $(Q)$(MAKE) $(build)=Documentation $@ 1702 1703 1704# Rust targets 1705# --------------------------------------------------------------------------- 1706 1707# "Is Rust available?" target 1708PHONY += rustavailable 1709rustavailable: 1710 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1711 1712# Documentation target 1713# 1714# Using the singular to avoid running afoul of `no-dot-config-targets`. 1715PHONY += rustdoc 1716rustdoc: prepare 1717 $(Q)$(MAKE) $(build)=rust $@ 1718 1719# Testing target 1720PHONY += rusttest 1721rusttest: prepare 1722 $(Q)$(MAKE) $(build)=rust $@ 1723 1724# Formatting targets 1725PHONY += rustfmt rustfmtcheck 1726 1727# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1728# 1729# We match using absolute paths since `find` does not resolve them 1730# when matching, which is a problem when e.g. `srctree` is `..`. 1731# We `grep` afterwards in order to remove the directory entry itself. 1732rustfmt: 1733 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1734 -o -path $(abs_srctree)/rust/alloc -prune \ 1735 -o -path $(abs_objtree)/rust/test -prune \ 1736 | grep -Fv $(abs_srctree)/rust/alloc \ 1737 | grep -Fv $(abs_objtree)/rust/test \ 1738 | grep -Fv generated \ 1739 | xargs $(RUSTFMT) $(rustfmt_flags) 1740 1741rustfmtcheck: rustfmt_flags = --check 1742rustfmtcheck: rustfmt 1743 1744# Misc 1745# --------------------------------------------------------------------------- 1746 1747PHONY += misc-check 1748misc-check: 1749 $(Q)$(srctree)/scripts/misc-check 1750 1751all: misc-check 1752 1753PHONY += scripts_gdb 1754scripts_gdb: prepare0 1755 $(Q)$(MAKE) $(build)=scripts/gdb 1756 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1757 1758ifdef CONFIG_GDB_SCRIPTS 1759all: scripts_gdb 1760endif 1761 1762else # KBUILD_EXTMOD 1763 1764filechk_kernel.release = echo $(KERNELRELEASE) 1765 1766### 1767# External module support. 1768# When building external modules the kernel used as basis is considered 1769# read-only, and no consistency checks are made and the make 1770# system is not used on the basis kernel. If updates are required 1771# in the basis kernel ordinary make commands (without M=...) must be used. 1772 1773# We are always building only modules. 1774KBUILD_BUILTIN := 1775KBUILD_MODULES := 1 1776 1777build-dir := $(KBUILD_EXTMOD) 1778 1779compile_commands.json: $(extmod_prefix)compile_commands.json 1780PHONY += compile_commands.json 1781 1782clean-dirs := $(KBUILD_EXTMOD) 1783clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1784 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1785 1786PHONY += prepare 1787# now expand this into a simple variable to reduce the cost of shell evaluations 1788prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1789prepare: 1790 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1791 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1792 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1793 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1794 fi 1795 1796PHONY += help 1797help: 1798 @echo ' Building external modules.' 1799 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1800 @echo '' 1801 @echo ' modules - default target, build the module(s)' 1802 @echo ' modules_install - install the module' 1803 @echo ' clean - remove generated files in module directory only' 1804 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1805 @echo '' 1806 1807ifndef CONFIG_MODULES 1808modules modules_install: __external_modules_error 1809__external_modules_error: 1810 @echo >&2 '***' 1811 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1812 @echo >&2 '*** You cannot build or install external modules.' 1813 @echo >&2 '***' 1814 @false 1815endif 1816 1817endif # KBUILD_EXTMOD 1818 1819# --------------------------------------------------------------------------- 1820# Modules 1821 1822PHONY += modules modules_install modules_sign modules_prepare 1823 1824modules_install: 1825 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1826 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1827 1828ifeq ($(CONFIG_MODULE_SIG),y) 1829# modules_sign is a subset of modules_install. 1830# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1831modules_sign: modules_install 1832 @: 1833else 1834modules_sign: 1835 @echo >&2 '***' 1836 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1837 @echo >&2 '***' 1838 @false 1839endif 1840 1841ifdef CONFIG_MODULES 1842 1843$(MODORDER): $(build-dir) 1844 @: 1845 1846# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1847# This is solely useful to speed up test compiles. 1848modules: modpost 1849ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1850 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1851endif 1852 1853PHONY += modules_check 1854modules_check: $(MODORDER) 1855 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1856 1857else # CONFIG_MODULES 1858 1859modules: 1860 @: 1861 1862KBUILD_MODULES := 1863 1864endif # CONFIG_MODULES 1865 1866PHONY += modpost 1867modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1868 $(if $(KBUILD_MODULES), modules_check) 1869 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1870 1871# Single targets 1872# --------------------------------------------------------------------------- 1873# To build individual files in subdirectories, you can do like this: 1874# 1875# make foo/bar/baz.s 1876# 1877# The supported suffixes for single-target are listed in 'single-targets' 1878# 1879# To build only under specific subdirectories, you can do like this: 1880# 1881# make foo/bar/baz/ 1882 1883ifdef single-build 1884 1885# .ko is special because modpost is needed 1886single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1887single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1888 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1889 1890$(single-ko): single_modules 1891 @: 1892$(single-no-ko): $(build-dir) 1893 @: 1894 1895# Remove MODORDER when done because it is not the real one. 1896PHONY += single_modules 1897single_modules: $(single-no-ko) modules_prepare 1898 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1899 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1900ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1901 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1902endif 1903 $(Q)rm -f $(MODORDER) 1904 1905single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1906 1907KBUILD_MODULES := 1 1908 1909endif 1910 1911# Preset locale variables to speed up the build process. Limit locale 1912# tweaks to this spot to avoid wrong language settings when running 1913# make menuconfig etc. 1914# Error messages still appears in the original language 1915PHONY += $(build-dir) 1916$(build-dir): prepare 1917 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1918 1919clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1920PHONY += $(clean-dirs) clean 1921$(clean-dirs): 1922 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1923 1924clean: $(clean-dirs) 1925 $(call cmd,rmfiles) 1926 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1927 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1928 -o -name '*.ko.*' \ 1929 -o -name '*.dtb' -o -name '*.dtbo' \ 1930 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1931 -o -name '*.dt.yaml' \ 1932 -o -name '*.dwo' -o -name '*.lst' \ 1933 -o -name '*.su' -o -name '*.mod' \ 1934 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1935 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1936 -o -name '*.asn1.[ch]' \ 1937 -o -name '*.symtypes' -o -name 'modules.order' \ 1938 -o -name '*.c.[012]*.*' \ 1939 -o -name '*.ll' \ 1940 -o -name '*.gcno' \ 1941 -o -name '*.*.symversions' \) -type f -print \ 1942 -o -name '.tmp_*' -print \ 1943 | xargs rm -rf 1944 1945# Generate tags for editors 1946# --------------------------------------------------------------------------- 1947quiet_cmd_tags = GEN $@ 1948 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1949 1950tags TAGS cscope gtags: FORCE 1951 $(call cmd,tags) 1952 1953# IDE support targets 1954PHONY += rust-analyzer 1955rust-analyzer: 1956 $(Q)$(MAKE) $(build)=rust $@ 1957 1958# Script to generate missing namespace dependencies 1959# --------------------------------------------------------------------------- 1960 1961PHONY += nsdeps 1962nsdeps: export KBUILD_NSDEPS=1 1963nsdeps: modules 1964 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1965 1966# Clang Tooling 1967# --------------------------------------------------------------------------- 1968 1969quiet_cmd_gen_compile_commands = GEN $@ 1970 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1971 1972$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1973 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1974 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1975 $(call if_changed,gen_compile_commands) 1976 1977targets += $(extmod_prefix)compile_commands.json 1978 1979PHONY += clang-tidy clang-analyzer 1980 1981ifdef CONFIG_CC_IS_CLANG 1982quiet_cmd_clang_tools = CHECK $< 1983 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1984 1985clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1986 $(call cmd,clang_tools) 1987else 1988clang-tidy clang-analyzer: 1989 @echo "$@ requires CC=clang" >&2 1990 @false 1991endif 1992 1993# Scripts to check various things for consistency 1994# --------------------------------------------------------------------------- 1995 1996PHONY += includecheck versioncheck coccicheck export_report 1997 1998includecheck: 1999 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2000 -name '*.[hcS]' -type f -print | sort \ 2001 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2002 2003versioncheck: 2004 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2005 -name '*.[hcS]' -type f -print | sort \ 2006 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2007 2008coccicheck: 2009 $(Q)$(BASH) $(srctree)/scripts/$@ 2010 2011export_report: 2012 $(PERL) $(srctree)/scripts/export_report.pl 2013 2014PHONY += checkstack kernelrelease kernelversion image_name 2015 2016# UML needs a little special treatment here. It wants to use the host 2017# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2018# else wants $(ARCH), including people doing cross-builds, which means 2019# that $(SUBARCH) doesn't work here. 2020ifeq ($(ARCH), um) 2021CHECKSTACK_ARCH := $(SUBARCH) 2022else 2023CHECKSTACK_ARCH := $(ARCH) 2024endif 2025MINSTACKSIZE ?= 100 2026checkstack: 2027 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2028 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2029 2030kernelrelease: 2031 @$(filechk_kernel.release) 2032 2033kernelversion: 2034 @echo $(KERNELVERSION) 2035 2036image_name: 2037 @echo $(KBUILD_IMAGE) 2038 2039PHONY += run-command 2040run-command: 2041 $(Q)$(KBUILD_RUN_COMMAND) 2042 2043quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2044 cmd_rmfiles = rm -rf $(rm-files) 2045 2046# read saved command lines for existing targets 2047existing-targets := $(wildcard $(sort $(targets))) 2048 2049-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2050 2051endif # config-build 2052endif # mixed-build 2053endif # need-sub-make 2054 2055PHONY += FORCE 2056FORCE: 2057 2058# Declare the contents of the PHONY variable as phony. We keep that 2059# information in a variable so we can use it in if_changed and friends. 2060.PHONY: $(PHONY) 2061