1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Hurr durr I'ma ninja sloth 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41ifneq ($(sub_make_done),1) 42 43# Do not use make's built-in rules and variables 44# (this increases performance and avoids hard-to-debug behaviour) 45MAKEFLAGS += -rR 46 47# Avoid funny character set dependencies 48unexport LC_ALL 49LC_COLLATE=C 50LC_NUMERIC=C 51export LC_COLLATE LC_NUMERIC 52 53# Avoid interference with shell env settings 54unexport GREP_OPTIONS 55 56# Beautify output 57# --------------------------------------------------------------------------- 58# 59# Most of build commands in Kbuild start with "cmd_". You can optionally define 60# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 61# that command is printed by default. 62# 63# e.g.) 64# quiet_cmd_depmod = DEPMOD $(MODLIB) 65# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)$(MAKE) $(build)=scripts/basic 71# 72# If KBUILD_VERBOSE contains 1, the whole command is echoed. 73# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 74# 75# To put more focus on warnings, be less verbose as default 76# Use 'make V=1' to see the full commands 77 78ifeq ("$(origin V)", "command line") 79 KBUILD_VERBOSE = $(V) 80endif 81 82quiet = quiet_ 83Q = @ 84 85ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 86 quiet = 87 Q = 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 93 94ifeq ($(filter 3.%,$(MAKE_VERSION)),) 95short-opts := $(firstword -$(MAKEFLAGS)) 96else 97short-opts := $(filter-out --%,$(MAKEFLAGS)) 98endif 99 100ifneq ($(findstring s,$(short-opts)),) 101quiet=silent_ 102override KBUILD_VERBOSE := 103endif 104 105export quiet Q KBUILD_VERBOSE 106 107# Call a source code checker (by default, "sparse") as part of the 108# C compilation. 109# 110# Use 'make C=1' to enable checking of only re-compiled files. 111# Use 'make C=2' to enable checking of *all* source files, regardless 112# of whether they are re-compiled or not. 113# 114# See the file "Documentation/dev-tools/sparse.rst" for more details, 115# including where to get the "sparse" utility. 116 117ifeq ("$(origin C)", "command line") 118 KBUILD_CHECKSRC = $(C) 119endif 120ifndef KBUILD_CHECKSRC 121 KBUILD_CHECKSRC = 0 122endif 123 124export KBUILD_CHECKSRC 125 126# Enable "clippy" (a linter) as part of the Rust compilation. 127# 128# Use 'make CLIPPY=1' to enable it. 129ifeq ("$(origin CLIPPY)", "command line") 130 KBUILD_CLIPPY := $(CLIPPY) 131endif 132 133export KBUILD_CLIPPY 134 135# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 136# directory of external module to build. Setting M= takes precedence. 137ifeq ("$(origin M)", "command line") 138 KBUILD_EXTMOD := $(M) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154# Kbuild will save output files in the current working directory. 155# This does not need to match to the root of the kernel source tree. 156# 157# For example, you can do this: 158# 159# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 160# 161# If you want to save output files in a different location, there are 162# two syntaxes to specify it. 163# 164# 1) O= 165# Use "make O=dir/to/store/output/files/" 166# 167# 2) Set KBUILD_OUTPUT 168# Set the environment variable KBUILD_OUTPUT to point to the output directory. 169# export KBUILD_OUTPUT=dir/to/store/output/files/; make 170# 171# The O= assignment takes precedence over the KBUILD_OUTPUT environment 172# variable. 173 174# Do we want to change the working directory? 175ifeq ("$(origin O)", "command line") 176 KBUILD_OUTPUT := $(O) 177endif 178 179ifneq ($(KBUILD_OUTPUT),) 180# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 181# expand a shell special character '~'. We use a somewhat tedious way here. 182abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 183$(if $(abs_objtree),, \ 184 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 185 186# $(realpath ...) resolves symlinks 187abs_objtree := $(realpath $(abs_objtree)) 188else 189abs_objtree := $(CURDIR) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifeq ($(abs_objtree),$(CURDIR)) 193# Suppress "Entering directory ..." unless we are changing the work directory. 194MAKEFLAGS += --no-print-directory 195else 196need-sub-make := 1 197endif 198 199this-makefile := $(lastword $(MAKEFILE_LIST)) 200abs_srctree := $(realpath $(dir $(this-makefile))) 201 202ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 203$(error source directory cannot contain spaces or colons) 204endif 205 206ifneq ($(filter 3.%,$(MAKE_VERSION)),) 207# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 208# We need to invoke sub-make to avoid implicit rules in the top Makefile. 209need-sub-make := 1 210# Cancel implicit rules for this Makefile. 211$(this-makefile): ; 212endif 213 214export abs_srctree abs_objtree 215export sub_make_done := 1 216 217ifeq ($(need-sub-make),1) 218 219PHONY += $(MAKECMDGOALS) __sub-make 220 221$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 222 @: 223 224# Invoke a second make in the output directory, passing relevant variables 225__sub-make: 226 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 227 228endif # need-sub-make 229endif # sub_make_done 230 231# We process the rest of the Makefile if this is the final invocation of make 232ifeq ($(need-sub-make),) 233 234# Do not print "Entering directory ...", 235# but we want to display it when entering to the output directory 236# so that IDEs/editors are able to understand relative filenames. 237MAKEFLAGS += --no-print-directory 238 239ifeq ($(abs_srctree),$(abs_objtree)) 240 # building in the source tree 241 srctree := . 242 building_out_of_srctree := 243else 244 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 245 # building in a subdirectory of the source tree 246 srctree := .. 247 else 248 srctree := $(abs_srctree) 249 endif 250 building_out_of_srctree := 1 251endif 252 253ifneq ($(KBUILD_ABS_SRCTREE),) 254srctree := $(abs_srctree) 255endif 256 257objtree := . 258VPATH := $(srctree) 259 260export building_out_of_srctree srctree objtree VPATH 261 262# To make sure we do not include .config for any of the *config targets 263# catch them early, and hand them over to scripts/kconfig/Makefile 264# It is allowed to specify more targets when calling make, including 265# mixing *config targets and build targets. 266# For example 'make oldconfig all'. 267# Detect when mixed targets is specified, and make a second invocation 268# of make so .config is not included in this case either (for *config). 269 270version_h := include/generated/uapi/linux/version.h 271 272clean-targets := %clean mrproper cleandocs 273no-dot-config-targets := $(clean-targets) \ 274 cscope gtags TAGS tags help% %docs check% coccicheck \ 275 $(version_h) headers headers_% archheaders archscripts \ 276 %asm-generic kernelversion %src-pkg dt_binding_check \ 277 outputmakefile rustavailable rustfmt rustfmtcheck \ 278 scripts_package 279# Installation targets should not require compiler. Unfortunately, vdso_install 280# is an exception where build artifacts may be updated. This must be fixed. 281no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 282 headers_install modules_install kernelrelease image_name 283no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 284 image_name 285single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 286 287config-build := 288mixed-build := 289need-config := 1 290need-compiler := 1 291may-sync-config := 1 292single-build := 293 294ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 295 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 296 need-config := 297 endif 298endif 299 300ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 301 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 302 need-compiler := 303 endif 304endif 305 306ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 307 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 308 may-sync-config := 309 endif 310endif 311 312ifneq ($(KBUILD_EXTMOD),) 313 may-sync-config := 314endif 315 316ifeq ($(KBUILD_EXTMOD),) 317 ifneq ($(filter %config,$(MAKECMDGOALS)),) 318 config-build := 1 319 ifneq ($(words $(MAKECMDGOALS)),1) 320 mixed-build := 1 321 endif 322 endif 323endif 324 325# We cannot build single targets and the others at the same time 326ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 327 single-build := 1 328 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 329 mixed-build := 1 330 endif 331endif 332 333# For "make -j clean all", "make -j mrproper defconfig all", etc. 334ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 335 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 336 mixed-build := 1 337 endif 338endif 339 340# install and modules_install need also be processed one by one 341ifneq ($(filter install,$(MAKECMDGOALS)),) 342 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 343 mixed-build := 1 344 endif 345endif 346 347ifdef mixed-build 348# =========================================================================== 349# We're called with mixed targets (*config and build targets). 350# Handle them one by one. 351 352PHONY += $(MAKECMDGOALS) __build_one_by_one 353 354$(MAKECMDGOALS): __build_one_by_one 355 @: 356 357__build_one_by_one: 358 $(Q)set -e; \ 359 for i in $(MAKECMDGOALS); do \ 360 $(MAKE) -f $(srctree)/Makefile $$i; \ 361 done 362 363else # !mixed-build 364 365include $(srctree)/scripts/Kbuild.include 366 367# Read KERNELRELEASE from include/config/kernel.release (if it exists) 368KERNELRELEASE = $(call read-file, include/config/kernel.release) 369KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 370export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 371 372include $(srctree)/scripts/subarch.include 373 374# Cross compiling and selecting different set of gcc/bin-utils 375# --------------------------------------------------------------------------- 376# 377# When performing cross compilation for other architectures ARCH shall be set 378# to the target architecture. (See arch/* for the possibilities). 379# ARCH can be set during invocation of make: 380# make ARCH=ia64 381# Another way is to have ARCH set in the environment. 382# The default ARCH is the host where make is executed. 383 384# CROSS_COMPILE specify the prefix used for all executables used 385# during compilation. Only gcc and related bin-utils executables 386# are prefixed with $(CROSS_COMPILE). 387# CROSS_COMPILE can be set on the command line 388# make CROSS_COMPILE=ia64-linux- 389# Alternatively CROSS_COMPILE can be set in the environment. 390# Default value for CROSS_COMPILE is not to prefix executables 391# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 392ARCH ?= $(SUBARCH) 393 394# Architecture as present in compile.h 395UTS_MACHINE := $(ARCH) 396SRCARCH := $(ARCH) 397 398# Additional ARCH settings for x86 399ifeq ($(ARCH),i386) 400 SRCARCH := x86 401endif 402ifeq ($(ARCH),x86_64) 403 SRCARCH := x86 404endif 405 406# Additional ARCH settings for sparc 407ifeq ($(ARCH),sparc32) 408 SRCARCH := sparc 409endif 410ifeq ($(ARCH),sparc64) 411 SRCARCH := sparc 412endif 413 414# Additional ARCH settings for parisc 415ifeq ($(ARCH),parisc64) 416 SRCARCH := parisc 417endif 418 419export cross_compiling := 420ifneq ($(SRCARCH),$(SUBARCH)) 421cross_compiling := 1 422endif 423 424KCONFIG_CONFIG ?= .config 425export KCONFIG_CONFIG 426 427# SHELL used by kbuild 428CONFIG_SHELL := sh 429 430HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 431HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 432HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 433 434ifneq ($(LLVM),) 435ifneq ($(filter %/,$(LLVM)),) 436LLVM_PREFIX := $(LLVM) 437else ifneq ($(filter -%,$(LLVM)),) 438LLVM_SUFFIX := $(LLVM) 439endif 440 441HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 442HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 443else 444HOSTCC = gcc 445HOSTCXX = g++ 446endif 447HOSTRUSTC = rustc 448HOSTPKG_CONFIG = pkg-config 449 450KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 451 -O2 -fomit-frame-pointer -std=gnu11 \ 452 -Wdeclaration-after-statement 453KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 454KBUILD_USERLDFLAGS := $(USERLDFLAGS) 455 456# These flags apply to all Rust code in the tree, including the kernel and 457# host programs. 458export rust_common_flags := --edition=2021 \ 459 -Zbinary_dep_depinfo=y \ 460 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 461 -Dunreachable_pub -Dnon_ascii_idents \ 462 -Wmissing_docs \ 463 -Drustdoc::missing_crate_level_docs \ 464 -Dclippy::correctness -Dclippy::style \ 465 -Dclippy::suspicious -Dclippy::complexity \ 466 -Dclippy::perf \ 467 -Dclippy::let_unit_value -Dclippy::mut_mut \ 468 -Dclippy::needless_bitwise_bool \ 469 -Dclippy::needless_continue \ 470 -Wclippy::dbg_macro 471 472KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 473KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 474KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 475 -Zallow-features= $(HOSTRUSTFLAGS) 476KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 477KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 478 479# Make variables (CC, etc...) 480CPP = $(CC) -E 481ifneq ($(LLVM),) 482CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 483LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 484AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 485NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 486OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 487OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 488READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 489STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 490else 491CC = $(CROSS_COMPILE)gcc 492LD = $(CROSS_COMPILE)ld 493AR = $(CROSS_COMPILE)ar 494NM = $(CROSS_COMPILE)nm 495OBJCOPY = $(CROSS_COMPILE)objcopy 496OBJDUMP = $(CROSS_COMPILE)objdump 497READELF = $(CROSS_COMPILE)readelf 498STRIP = $(CROSS_COMPILE)strip 499endif 500RUSTC = rustc 501RUSTDOC = rustdoc 502RUSTFMT = rustfmt 503CLIPPY_DRIVER = clippy-driver 504BINDGEN = bindgen 505CARGO = cargo 506PAHOLE = pahole 507RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 508LEX = flex 509YACC = bison 510AWK = awk 511INSTALLKERNEL := installkernel 512DEPMOD = depmod 513PERL = perl 514PYTHON3 = python3 515CHECK = sparse 516BASH = bash 517KGZIP = gzip 518KBZIP2 = bzip2 519KLZOP = lzop 520LZMA = lzma 521LZ4 = lz4c 522XZ = xz 523ZSTD = zstd 524 525PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 526 527CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 528 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 529NOSTDINC_FLAGS := 530CFLAGS_MODULE = 531RUSTFLAGS_MODULE = 532AFLAGS_MODULE = 533LDFLAGS_MODULE = 534CFLAGS_KERNEL = 535RUSTFLAGS_KERNEL = 536AFLAGS_KERNEL = 537LDFLAGS_vmlinux = 538 539# Use USERINCLUDE when you must reference the UAPI directories only. 540USERINCLUDE := \ 541 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 542 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 543 -I$(srctree)/include/uapi \ 544 -I$(objtree)/include/generated/uapi \ 545 -include $(srctree)/include/linux/compiler-version.h \ 546 -include $(srctree)/include/linux/kconfig.h 547 548# Use LINUXINCLUDE when you must reference the include/ directory. 549# Needed to be compatible with the O= option 550LINUXINCLUDE := \ 551 -I$(srctree)/arch/$(SRCARCH)/include \ 552 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 553 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 554 -I$(objtree)/include \ 555 $(USERINCLUDE) 556 557KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 558KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 559 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 560 -Werror=implicit-function-declaration -Werror=implicit-int \ 561 -Werror=return-type -Wno-format-security -funsigned-char \ 562 -std=gnu11 563KBUILD_CPPFLAGS := -D__KERNEL__ 564KBUILD_RUSTFLAGS := $(rust_common_flags) \ 565 --target=$(objtree)/scripts/target.json \ 566 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 567 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 568 -Csymbol-mangling-version=v0 \ 569 -Crelocation-model=static \ 570 -Zfunction-sections=n \ 571 -Dclippy::float_arithmetic 572 573KBUILD_AFLAGS_KERNEL := 574KBUILD_CFLAGS_KERNEL := 575KBUILD_RUSTFLAGS_KERNEL := 576KBUILD_AFLAGS_MODULE := -DMODULE 577KBUILD_CFLAGS_MODULE := -DMODULE 578KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 579KBUILD_LDFLAGS_MODULE := 580KBUILD_LDFLAGS := 581CLANG_FLAGS := 582 583ifeq ($(KBUILD_CLIPPY),1) 584 RUSTC_OR_CLIPPY_QUIET := CLIPPY 585 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 586else 587 RUSTC_OR_CLIPPY_QUIET := RUSTC 588 RUSTC_OR_CLIPPY = $(RUSTC) 589endif 590 591ifdef RUST_LIB_SRC 592 export RUST_LIB_SRC 593endif 594 595# Allows the usage of unstable features in stable compilers. 596export RUSTC_BOOTSTRAP := 1 597 598export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 599export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 600export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 601export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 602export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 603export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 604export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 605export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 606 607export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 608export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 609export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 610export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 611export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 612export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 613export PAHOLE_FLAGS 614 615# Files to ignore in find ... statements 616 617export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 618 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 619 -prune -o 620export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 621 --exclude CVS --exclude .pc --exclude .hg --exclude .git 622 623# =========================================================================== 624# Rules shared between *config targets and build targets 625 626# Basic helpers built in scripts/basic/ 627PHONY += scripts_basic 628scripts_basic: 629 $(Q)$(MAKE) $(build)=scripts/basic 630 631PHONY += outputmakefile 632ifdef building_out_of_srctree 633# Before starting out-of-tree build, make sure the source tree is clean. 634# outputmakefile generates a Makefile in the output directory, if using a 635# separate output directory. This allows convenient use of make in the 636# output directory. 637# At the same time when output Makefile generated, generate .gitignore to 638# ignore whole output directory 639 640quiet_cmd_makefile = GEN Makefile 641 cmd_makefile = { \ 642 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 643 echo "include $(srctree)/Makefile"; \ 644 } > Makefile 645 646outputmakefile: 647 @if [ -f $(srctree)/.config -o \ 648 -d $(srctree)/include/config -o \ 649 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 650 echo >&2 "***"; \ 651 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 652 echo >&2 "*** in $(abs_srctree)";\ 653 echo >&2 "***"; \ 654 false; \ 655 fi 656 $(Q)ln -fsn $(srctree) source 657 $(call cmd,makefile) 658 $(Q)test -e .gitignore || \ 659 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 660endif 661 662# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 663# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 664# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 665# and from include/config/auto.conf.cmd to detect the compiler upgrade. 666CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 667 668ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 669include $(srctree)/scripts/Makefile.clang 670endif 671 672# Include this also for config targets because some architectures need 673# cc-cross-prefix to determine CROSS_COMPILE. 674ifdef need-compiler 675include $(srctree)/scripts/Makefile.compiler 676endif 677 678ifdef config-build 679# =========================================================================== 680# *config targets only - make sure prerequisites are updated, and descend 681# in scripts/kconfig to make the *config target 682 683# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 684# KBUILD_DEFCONFIG may point out an alternative default configuration 685# used for 'make defconfig' 686include $(srctree)/arch/$(SRCARCH)/Makefile 687export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 688 689config: outputmakefile scripts_basic FORCE 690 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 691 692%config: outputmakefile scripts_basic FORCE 693 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 694 695else #!config-build 696# =========================================================================== 697# Build targets only - this includes vmlinux, arch specific targets, clean 698# targets and others. In general all targets except *config targets. 699 700# If building an external module we do not care about the all: rule 701# but instead __all depend on modules 702PHONY += all 703ifeq ($(KBUILD_EXTMOD),) 704__all: all 705else 706__all: modules 707endif 708 709targets := 710 711# Decide whether to build built-in, modular, or both. 712# Normally, just do built-in. 713 714KBUILD_MODULES := 715KBUILD_BUILTIN := 1 716 717# If we have only "make modules", don't compile built-in objects. 718ifeq ($(MAKECMDGOALS),modules) 719 KBUILD_BUILTIN := 720endif 721 722# If we have "make <whatever> modules", compile modules 723# in addition to whatever we do anyway. 724# Just "make" or "make all" shall build modules as well 725 726ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 727 KBUILD_MODULES := 1 728endif 729 730ifeq ($(MAKECMDGOALS),) 731 KBUILD_MODULES := 1 732endif 733 734export KBUILD_MODULES KBUILD_BUILTIN 735 736ifdef need-config 737include include/config/auto.conf 738endif 739 740ifeq ($(KBUILD_EXTMOD),) 741# Objects we will link into vmlinux / subdirs we need to visit 742core-y := 743drivers-y := 744libs-y := lib/ 745endif # KBUILD_EXTMOD 746 747# The all: target is the default when no target is given on the 748# command line. 749# This allow a user to issue only 'make' to build a kernel including modules 750# Defaults to vmlinux, but the arch makefile usually adds further targets 751all: vmlinux 752 753CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 754ifdef CONFIG_CC_IS_GCC 755CFLAGS_GCOV += -fno-tree-loop-im 756endif 757export CFLAGS_GCOV 758 759# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 760ifdef CONFIG_FUNCTION_TRACER 761 CC_FLAGS_FTRACE := -pg 762endif 763 764include $(srctree)/arch/$(SRCARCH)/Makefile 765 766ifdef need-config 767ifdef may-sync-config 768# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 769# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 770# because some architectures define CROSS_COMPILE there. 771include include/config/auto.conf.cmd 772 773$(KCONFIG_CONFIG): 774 @echo >&2 '***' 775 @echo >&2 '*** Configuration file "$@" not found!' 776 @echo >&2 '***' 777 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 778 @echo >&2 '*** "make menuconfig" or "make xconfig").' 779 @echo >&2 '***' 780 @/bin/false 781 782# The actual configuration files used during the build are stored in 783# include/generated/ and include/config/. Update them if .config is newer than 784# include/config/auto.conf (which mirrors .config). 785# 786# This exploits the 'multi-target pattern rule' trick. 787# The syncconfig should be executed only once to make all the targets. 788# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 789# 790# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 791# so you cannot notice that Kconfig is waiting for the user input. 792%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 793 $(Q)$(kecho) " SYNC $@" 794 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 795else # !may-sync-config 796# External modules and some install targets need include/generated/autoconf.h 797# and include/config/auto.conf but do not care if they are up-to-date. 798# Use auto.conf to trigger the test 799PHONY += include/config/auto.conf 800 801include/config/auto.conf: 802 @test -e include/generated/autoconf.h -a -e $@ || ( \ 803 echo >&2; \ 804 echo >&2 " ERROR: Kernel configuration is invalid."; \ 805 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 806 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 807 echo >&2 ; \ 808 /bin/false) 809 810endif # may-sync-config 811endif # need-config 812 813KBUILD_CFLAGS += -fno-delete-null-pointer-checks 814KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 815KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 816KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 817KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 818 819ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 820KBUILD_CFLAGS += -O2 821KBUILD_RUSTFLAGS += -Copt-level=2 822else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 823KBUILD_CFLAGS += -Os 824KBUILD_RUSTFLAGS += -Copt-level=s 825endif 826 827# Always set `debug-assertions` and `overflow-checks` because their default 828# depends on `opt-level` and `debug-assertions`, respectively. 829KBUILD_RUSTFLAGS += -Cdebug-assertions=$(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 += $(call cc-option,-fno-allow-store-data-races) 838endif 839 840ifdef CONFIG_READABLE_ASM 841# Disable optimizations that make assembler listings hard to read. 842# reorder blocks reorders the control in the function 843# ipa clone creates specialized cloned functions 844# partial inlining inlines only parts of functions 845KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 846endif 847 848ifneq ($(CONFIG_FRAME_WARN),0) 849KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 850endif 851 852stackp-flags-y := -fno-stack-protector 853stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 854stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 855 856KBUILD_CFLAGS += $(stackp-flags-y) 857 858KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 859KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 860KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 861 862KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 863KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 864 865ifdef CONFIG_CC_IS_CLANG 866# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 867KBUILD_CFLAGS += -Wno-gnu 868else 869 870# gcc inanely warns about local variables called 'main' 871KBUILD_CFLAGS += -Wno-main 872endif 873 874# These warnings generated too much noise in a regular build. 875# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 876KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 877KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 878 879# These result in bogus false positives 880KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 881 882ifdef CONFIG_FRAME_POINTER 883KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 884KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 885else 886# Some targets (ARM with Thumb2, for example), can't be built with frame 887# pointers. For those, we don't have FUNCTION_TRACER automatically 888# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 889# incompatible with -fomit-frame-pointer with current GCC, so we don't use 890# -fomit-frame-pointer with FUNCTION_TRACER. 891# In the Rust target specification, "frame-pointer" is set explicitly 892# to "may-omit". 893ifndef CONFIG_FUNCTION_TRACER 894KBUILD_CFLAGS += -fomit-frame-pointer 895endif 896endif 897 898# Initialize all stack variables with a 0xAA pattern. 899ifdef CONFIG_INIT_STACK_ALL_PATTERN 900KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 901endif 902 903# Initialize all stack variables with a zero value. 904ifdef CONFIG_INIT_STACK_ALL_ZERO 905KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 906ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 907# https://github.com/llvm/llvm-project/issues/44842 908CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 909export CC_AUTO_VAR_INIT_ZERO_ENABLER 910KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 911endif 912endif 913 914# While VLAs have been removed, GCC produces unreachable stack probes 915# for the randomize_kstack_offset feature. Disable it for all compilers. 916KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 917 918# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 919ifdef CONFIG_ZERO_CALL_USED_REGS 920KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 921endif 922 923ifdef CONFIG_FUNCTION_TRACER 924ifdef CONFIG_FTRACE_MCOUNT_USE_CC 925 CC_FLAGS_FTRACE += -mrecord-mcount 926 ifdef CONFIG_HAVE_NOP_MCOUNT 927 ifeq ($(call cc-option-yn, -mnop-mcount),y) 928 CC_FLAGS_FTRACE += -mnop-mcount 929 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 930 endif 931 endif 932endif 933ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 934 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 935 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 936 endif 937endif 938ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 939 ifdef CONFIG_HAVE_C_RECORDMCOUNT 940 BUILD_C_RECORDMCOUNT := y 941 export BUILD_C_RECORDMCOUNT 942 endif 943endif 944ifdef CONFIG_HAVE_FENTRY 945 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 946 ifeq ($(call cc-option-yn, -mfentry),y) 947 CC_FLAGS_FTRACE += -mfentry 948 CC_FLAGS_USING += -DCC_USING_FENTRY 949 endif 950endif 951export CC_FLAGS_FTRACE 952KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 953KBUILD_AFLAGS += $(CC_FLAGS_USING) 954endif 955 956# We trigger additional mismatches with less inlining 957ifdef CONFIG_DEBUG_SECTION_MISMATCH 958KBUILD_CFLAGS += -fno-inline-functions-called-once 959endif 960 961# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 962ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 963KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 964KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 965LDFLAGS_vmlinux += --gc-sections 966endif 967 968ifdef CONFIG_SHADOW_CALL_STACK 969ifndef CONFIG_DYNAMIC_SCS 970CC_FLAGS_SCS := -fsanitize=shadow-call-stack 971KBUILD_CFLAGS += $(CC_FLAGS_SCS) 972endif 973export CC_FLAGS_SCS 974endif 975 976ifdef CONFIG_LTO_CLANG 977ifdef CONFIG_LTO_CLANG_THIN 978CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 979KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 980else 981CC_FLAGS_LTO := -flto 982endif 983CC_FLAGS_LTO += -fvisibility=hidden 984 985# Limit inlining across translation units to reduce binary size 986KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 987 988# Check for frame size exceeding threshold during prolog/epilog insertion 989# when using lld < 13.0.0. 990ifneq ($(CONFIG_FRAME_WARN),0) 991ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 992KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 993endif 994endif 995endif 996 997ifdef CONFIG_LTO 998KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 999KBUILD_AFLAGS += -fno-lto 1000export CC_FLAGS_LTO 1001endif 1002 1003ifdef CONFIG_CFI_CLANG 1004CC_FLAGS_CFI := -fsanitize=kcfi 1005KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1006export CC_FLAGS_CFI 1007endif 1008 1009ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1010KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1011endif 1012 1013# arch Makefile may override CC so keep this after arch Makefile is included 1014NOSTDINC_FLAGS += -nostdinc 1015 1016# warn about C99 declaration after statement 1017KBUILD_CFLAGS += -Wdeclaration-after-statement 1018 1019# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1020KBUILD_CFLAGS += -Wvla 1021 1022# disable pointer signed / unsigned warnings in gcc 4.0 1023KBUILD_CFLAGS += -Wno-pointer-sign 1024 1025# In order to make sure new function cast mismatches are not introduced 1026# in the kernel (to avoid tripping CFI checking), the kernel should be 1027# globally built with -Wcast-function-type. 1028KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1029 1030# disable stringop warnings in gcc 8+ 1031KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1032 1033# We'll want to enable this eventually, but it's not going away for 5.7 at least 1034KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1035 1036# Another good warning that we'll want to enable eventually 1037KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1038 1039# Enabled with W=2, disabled by default as noisy 1040ifdef CONFIG_CC_IS_GCC 1041KBUILD_CFLAGS += -Wno-maybe-uninitialized 1042endif 1043 1044# The allocators already balk at large sizes, so silence the compiler 1045# warnings for bounds checks involving those possible values. While 1046# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1047# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1048# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1049# doesn't work (as it is documented to), silently resolving to "0" prior to 1050# version 9.1 (and producing an error more recently). Numeric values larger 1051# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1052# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1053# choice, we must perform a versioned check to disable this warning. 1054# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1055KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1056KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1057 1058# disable invalid "can't wrap" optimizations for signed / pointers 1059KBUILD_CFLAGS += -fno-strict-overflow 1060 1061# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1062KBUILD_CFLAGS += -fno-stack-check 1063 1064# conserve stack if available 1065ifdef CONFIG_CC_IS_GCC 1066KBUILD_CFLAGS += -fconserve-stack 1067endif 1068 1069# Prohibit date/time macros, which would make the build non-deterministic 1070KBUILD_CFLAGS += -Werror=date-time 1071 1072# enforce correct pointer usage 1073KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1074 1075# Require designated initializers for all marked structures 1076KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1077 1078# change __FILE__ to the relative path from the srctree 1079KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1080 1081# include additional Makefiles when needed 1082include-y := scripts/Makefile.extrawarn 1083include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1084include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1085include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1086include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1087include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1088include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1089include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1090include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1091 1092include $(addprefix $(srctree)/, $(include-y)) 1093 1094# scripts/Makefile.gcc-plugins is intentionally included last. 1095# Do not add $(call cc-option,...) below this line. When you build the kernel 1096# from the clean source tree, the GCC plugins do not exist at this point. 1097 1098# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1099KBUILD_CPPFLAGS += $(KCPPFLAGS) 1100KBUILD_AFLAGS += $(KAFLAGS) 1101KBUILD_CFLAGS += $(KCFLAGS) 1102KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1103 1104KBUILD_LDFLAGS_MODULE += --build-id=sha1 1105LDFLAGS_vmlinux += --build-id=sha1 1106 1107KBUILD_LDFLAGS += -z noexecstack 1108ifeq ($(CONFIG_LD_IS_BFD),y) 1109KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1110endif 1111 1112ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1113LDFLAGS_vmlinux += -X 1114endif 1115 1116ifeq ($(CONFIG_RELR),y) 1117LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1118endif 1119 1120# We never want expected sections to be placed heuristically by the 1121# linker. All sections should be explicitly named in the linker script. 1122ifdef CONFIG_LD_ORPHAN_WARN 1123LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1124endif 1125 1126# Align the bit size of userspace programs with the kernel 1127KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1128KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1129 1130# make the checker run with the right architecture 1131CHECKFLAGS += --arch=$(ARCH) 1132 1133# insure the checker run with the right endianness 1134CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1135 1136# the checker needs the correct machine size 1137CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1138 1139# Default kernel image to build when no specific target is given. 1140# KBUILD_IMAGE may be overruled on the command line or 1141# set in the environment 1142# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1143# this default value 1144export KBUILD_IMAGE ?= vmlinux 1145 1146# 1147# INSTALL_PATH specifies where to place the updated kernel and system map 1148# images. Default is /boot, but you can set it to other values 1149export INSTALL_PATH ?= /boot 1150 1151# 1152# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1153# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1154# an argument if needed. Otherwise it defaults to the kernel install path 1155# 1156export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1157 1158# 1159# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1160# relocations required by build roots. This is not defined in the 1161# makefile but the argument can be passed to make if needed. 1162# 1163 1164MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1165export MODLIB 1166 1167PHONY += prepare0 1168 1169export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1170export MODORDER := $(extmod_prefix)modules.order 1171export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1172 1173ifeq ($(KBUILD_EXTMOD),) 1174 1175build-dir := . 1176clean-dirs := $(sort . Documentation \ 1177 $(patsubst %/,%,$(filter %/, $(core-) \ 1178 $(drivers-) $(libs-)))) 1179 1180export ARCH_CORE := $(core-y) 1181export ARCH_LIB := $(filter %/, $(libs-y)) 1182export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1183# Externally visible symbols (used by link-vmlinux.sh) 1184 1185KBUILD_VMLINUX_OBJS := ./built-in.a 1186ifdef CONFIG_MODULES 1187KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1188KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1189else 1190KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1191endif 1192 1193export KBUILD_VMLINUX_LIBS 1194export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1195 1196# Recurse until adjust_autoksyms.sh is satisfied 1197PHONY += autoksyms_recursive 1198ifdef CONFIG_TRIM_UNUSED_KSYMS 1199# For the kernel to actually contain only the needed exported symbols, 1200# we have to build modules as well to determine what those symbols are. 1201# (this can be evaluated only once include/config/auto.conf has been included) 1202KBUILD_MODULES := 1 1203 1204autoksyms_recursive: $(build-dir) modules.order 1205 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1206 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1207endif 1208 1209autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1210 1211quiet_cmd_autoksyms_h = GEN $@ 1212 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1213 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1214 1215$(autoksyms_h): 1216 $(call cmd,autoksyms_h) 1217 1218# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1219quiet_cmd_ar_vmlinux.a = AR $@ 1220 cmd_ar_vmlinux.a = \ 1221 rm -f $@; \ 1222 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1223 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1224 1225targets += vmlinux.a 1226vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1227 $(call if_changed,ar_vmlinux.a) 1228 1229PHONY += vmlinux_o 1230vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1231 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1232 1233vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1234 @: 1235 1236PHONY += vmlinux 1237# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1238# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1239# unrelated; the decompressors just happen to have the same base name, 1240# arch/*/boot/compressed/vmlinux. 1241# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1242# 1243# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1244# https://savannah.gnu.org/bugs/?61463 1245# For Make > 4.4, the following simple code will work: 1246# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1247vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1248vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1249vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1250 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1251 1252# The actual objects are generated when descending, 1253# make sure no implicit rule kicks in 1254$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1255 1256ifeq ($(origin KERNELRELEASE),file) 1257filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1258else 1259filechk_kernel.release = echo $(KERNELRELEASE) 1260endif 1261 1262# Store (new) KERNELRELEASE string in include/config/kernel.release 1263include/config/kernel.release: FORCE 1264 $(call filechk,kernel.release) 1265 1266# Additional helpers built in scripts/ 1267# Carefully list dependencies so we do not try to build scripts twice 1268# in parallel 1269PHONY += scripts 1270scripts: scripts_basic scripts_dtc 1271 $(Q)$(MAKE) $(build)=$(@) 1272 1273# Things we need to do before we recursively start building the kernel 1274# or the modules are listed in "prepare". 1275# A multi level approach is used. prepareN is processed before prepareN-1. 1276# archprepare is used in arch Makefiles and when processed asm symlink, 1277# version.h and scripts_basic is processed / created. 1278 1279PHONY += prepare archprepare 1280 1281archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1282 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1283 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1284 1285prepare0: archprepare 1286 $(Q)$(MAKE) $(build)=scripts/mod 1287 $(Q)$(MAKE) $(build)=. prepare 1288 1289# All the preparing.. 1290prepare: prepare0 1291ifdef CONFIG_RUST 1292 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1293 $(Q)$(MAKE) $(build)=rust 1294endif 1295 1296PHONY += remove-stale-files 1297remove-stale-files: 1298 $(Q)$(srctree)/scripts/remove-stale-files 1299 1300# Support for using generic headers in asm-generic 1301asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1302 1303PHONY += asm-generic uapi-asm-generic 1304asm-generic: uapi-asm-generic 1305 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1306 generic=include/asm-generic 1307uapi-asm-generic: 1308 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1309 generic=include/uapi/asm-generic 1310 1311# Generate some files 1312# --------------------------------------------------------------------------- 1313 1314# KERNELRELEASE can change from a few different places, meaning version.h 1315# needs to be updated, so this check is forced on all builds 1316 1317uts_len := 64 1318define filechk_utsrelease.h 1319 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1320 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1321 exit 1; \ 1322 fi; \ 1323 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1324endef 1325 1326define filechk_version.h 1327 if [ $(SUBLEVEL) -gt 255 ]; then \ 1328 echo \#define LINUX_VERSION_CODE $(shell \ 1329 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1330 else \ 1331 echo \#define LINUX_VERSION_CODE $(shell \ 1332 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1333 fi; \ 1334 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1335 ((c) > 255 ? 255 : (c)))'; \ 1336 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1337 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1338 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1339endef 1340 1341$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1342$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1343$(version_h): FORCE 1344 $(call filechk,version.h) 1345 1346include/generated/utsrelease.h: include/config/kernel.release FORCE 1347 $(call filechk,utsrelease.h) 1348 1349filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1350 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1351 1352include/generated/compile.h: FORCE 1353 $(call filechk,compile.h) 1354 1355PHONY += headerdep 1356headerdep: 1357 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1358 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1359 1360# --------------------------------------------------------------------------- 1361# Kernel headers 1362 1363#Default location for installed headers 1364export INSTALL_HDR_PATH = $(objtree)/usr 1365 1366quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1367 cmd_headers_install = \ 1368 mkdir -p $(INSTALL_HDR_PATH); \ 1369 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1370 usr/include $(INSTALL_HDR_PATH) 1371 1372PHONY += headers_install 1373headers_install: headers 1374 $(call cmd,headers_install) 1375 1376PHONY += archheaders archscripts 1377 1378hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1379 1380PHONY += headers 1381headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1382 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1383 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1384 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1385 1386ifdef CONFIG_HEADERS_INSTALL 1387prepare: headers 1388endif 1389 1390PHONY += scripts_unifdef 1391scripts_unifdef: scripts_basic 1392 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1393 1394# --------------------------------------------------------------------------- 1395# Install 1396 1397# Many distributions have the custom install script, /sbin/installkernel. 1398# If DKMS is installed, 'make install' will eventually recurse back 1399# to this Makefile to build and install external modules. 1400# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1401 1402quiet_cmd_install = INSTALL $(INSTALL_PATH) 1403 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1404 1405# --------------------------------------------------------------------------- 1406# Tools 1407 1408ifdef CONFIG_OBJTOOL 1409prepare: tools/objtool 1410endif 1411 1412ifdef CONFIG_BPF 1413ifdef CONFIG_DEBUG_INFO_BTF 1414prepare: tools/bpf/resolve_btfids 1415endif 1416endif 1417 1418PHONY += resolve_btfids_clean 1419 1420resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1421 1422# tools/bpf/resolve_btfids directory might not exist 1423# in output directory, skip its clean in that case 1424resolve_btfids_clean: 1425ifneq ($(wildcard $(resolve_btfids_O)),) 1426 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1427endif 1428 1429# Clear a bunch of variables before executing the submake 1430ifeq ($(quiet),silent_) 1431tools_silent=s 1432endif 1433 1434tools/: FORCE 1435 $(Q)mkdir -p $(objtree)/tools 1436 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1437 1438tools/%: FORCE 1439 $(Q)mkdir -p $(objtree)/tools 1440 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1441 1442# --------------------------------------------------------------------------- 1443# Kernel selftest 1444 1445PHONY += kselftest 1446kselftest: headers 1447 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1448 1449kselftest-%: headers FORCE 1450 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1451 1452PHONY += kselftest-merge 1453kselftest-merge: 1454 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1455 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1456 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1457 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1458 1459# --------------------------------------------------------------------------- 1460# Devicetree files 1461 1462ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1463dtstree := arch/$(SRCARCH)/boot/dts 1464endif 1465 1466ifneq ($(dtstree),) 1467 1468%.dtb: dtbs_prepare 1469 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1470 1471%.dtbo: dtbs_prepare 1472 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1473 1474PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1475dtbs: dtbs_prepare 1476 $(Q)$(MAKE) $(build)=$(dtstree) 1477 1478# include/config/kernel.release is actually needed when installing DTBs because 1479# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1480# dtbs_install depend on it as dtbs_install may run as root. 1481dtbs_prepare: include/config/kernel.release scripts_dtc 1482 1483ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1484export CHECK_DTBS=y 1485endif 1486 1487ifneq ($(CHECK_DTBS),) 1488dtbs_prepare: dt_binding_check 1489endif 1490 1491dtbs_check: dtbs 1492 1493dtbs_install: 1494 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1495 1496ifdef CONFIG_OF_EARLY_FLATTREE 1497all: dtbs 1498endif 1499 1500endif 1501 1502PHONY += scripts_dtc 1503scripts_dtc: scripts_basic 1504 $(Q)$(MAKE) $(build)=scripts/dtc 1505 1506ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1507export CHECK_DT_BINDING=y 1508endif 1509 1510PHONY += dt_binding_check 1511dt_binding_check: scripts_dtc 1512 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1513 1514PHONY += dt_compatible_check 1515dt_compatible_check: dt_binding_check 1516 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1517 1518# --------------------------------------------------------------------------- 1519# Modules 1520 1521ifdef CONFIG_MODULES 1522 1523# By default, build modules as well 1524 1525all: modules 1526 1527# When we're building modules with modversions, we need to consider 1528# the built-in objects during the descend as well, in order to 1529# make sure the checksums are up to date before we record them. 1530ifdef CONFIG_MODVERSIONS 1531 KBUILD_BUILTIN := 1 1532endif 1533 1534# Build modules 1535# 1536 1537# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1538# is an exception. 1539ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1540KBUILD_BUILTIN := 1 1541modules: vmlinux 1542endif 1543 1544modules: modules_prepare 1545 1546# Target to prepare building external modules 1547modules_prepare: prepare 1548 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1549 1550export modules_sign_only := 1551 1552ifeq ($(CONFIG_MODULE_SIG),y) 1553PHONY += modules_sign 1554modules_sign: modules_install 1555 @: 1556 1557# modules_sign is a subset of modules_install. 1558# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1559ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1560modules_sign_only := y 1561endif 1562endif 1563 1564modinst_pre := 1565ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1566modinst_pre := __modinst_pre 1567endif 1568 1569modules_install: $(modinst_pre) 1570PHONY += __modinst_pre 1571__modinst_pre: 1572 @rm -rf $(MODLIB)/kernel 1573 @rm -f $(MODLIB)/source 1574 @mkdir -p $(MODLIB)/kernel 1575 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1576 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1577 rm -f $(MODLIB)/build ; \ 1578 ln -s $(CURDIR) $(MODLIB)/build ; \ 1579 fi 1580 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1581 @cp -f modules.builtin $(MODLIB)/ 1582 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1583 1584endif # CONFIG_MODULES 1585 1586### 1587# Cleaning is done on three levels. 1588# make clean Delete most generated files 1589# Leave enough to build external modules 1590# make mrproper Delete the current configuration, and all generated files 1591# make distclean Remove editor backup files, patch leftover files and the like 1592 1593# Directories & files removed with 'make clean' 1594CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1595 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1596 compile_commands.json .thinlto-cache rust/test rust/doc \ 1597 rust-project.json .vmlinux.objs .vmlinux.export.c 1598 1599# Directories & files removed with 'make mrproper' 1600MRPROPER_FILES += include/config include/generated \ 1601 arch/$(SRCARCH)/include/generated .objdiff \ 1602 debian snap tar-install \ 1603 .config .config.old .version \ 1604 Module.symvers \ 1605 certs/signing_key.pem \ 1606 certs/x509.genkey \ 1607 vmlinux-gdb.py \ 1608 *.spec \ 1609 rust/libmacros.so 1610 1611# clean - Delete most, but leave enough to build external modules 1612# 1613clean: rm-files := $(CLEAN_FILES) 1614 1615PHONY += archclean vmlinuxclean 1616 1617vmlinuxclean: 1618 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1619 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1620 1621clean: archclean vmlinuxclean resolve_btfids_clean 1622 1623# mrproper - Delete all generated files, including .config 1624# 1625mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1626mrproper-dirs := $(addprefix _mrproper_,scripts) 1627 1628PHONY += $(mrproper-dirs) mrproper 1629$(mrproper-dirs): 1630 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1631 1632mrproper: clean $(mrproper-dirs) 1633 $(call cmd,rmfiles) 1634 @find . $(RCS_FIND_IGNORE) \ 1635 \( -name '*.rmeta' \) \ 1636 -type f -print | xargs rm -f 1637 1638# distclean 1639# 1640PHONY += distclean 1641 1642distclean: mrproper 1643 @find . $(RCS_FIND_IGNORE) \ 1644 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1645 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1646 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1647 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1648 -type f -print | xargs rm -f 1649 1650 1651# Packaging of the kernel to various formats 1652# --------------------------------------------------------------------------- 1653 1654%src-pkg: FORCE 1655 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1656%pkg: include/config/kernel.release FORCE 1657 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1658 1659PHONY += scripts_package 1660scripts_package: scripts_basic 1661 $(Q)$(MAKE) $(build)=scripts scripts/list-gitignored 1662 1663# Brief documentation of the typical targets used 1664# --------------------------------------------------------------------------- 1665 1666boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1667boards := $(sort $(notdir $(boards))) 1668board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1669board-dirs := $(sort $(notdir $(board-dirs:/=))) 1670 1671PHONY += help 1672help: 1673 @echo 'Cleaning targets:' 1674 @echo ' clean - Remove most generated files but keep the config and' 1675 @echo ' enough build support to build external modules' 1676 @echo ' mrproper - Remove all generated files + config + various backup files' 1677 @echo ' distclean - mrproper + remove editor backup and patch files' 1678 @echo '' 1679 @echo 'Configuration targets:' 1680 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1681 @echo '' 1682 @echo 'Other generic targets:' 1683 @echo ' all - Build all targets marked with [*]' 1684 @echo '* vmlinux - Build the bare kernel' 1685 @echo '* modules - Build all modules' 1686 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1687 @echo ' dir/ - Build all files in dir and below' 1688 @echo ' dir/file.[ois] - Build specified target only' 1689 @echo ' dir/file.ll - Build the LLVM assembly file' 1690 @echo ' (requires compiler support for LLVM assembly generation)' 1691 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1692 @echo ' (requires a recent binutils and recent build (System.map))' 1693 @echo ' dir/file.ko - Build module including final link' 1694 @echo ' modules_prepare - Set up for building external modules' 1695 @echo ' tags/TAGS - Generate tags file for editors' 1696 @echo ' cscope - Generate cscope index' 1697 @echo ' gtags - Generate GNU GLOBAL index' 1698 @echo ' kernelrelease - Output the release version string (use with make -s)' 1699 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1700 @echo ' image_name - Output the image name (use with make -s)' 1701 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1702 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1703 echo '' 1704 @echo 'Static analysers:' 1705 @echo ' checkstack - Generate a list of stack hogs' 1706 @echo ' versioncheck - Sanity check on version.h usage' 1707 @echo ' includecheck - Check for duplicate included header files' 1708 @echo ' export_report - List the usages of all exported symbols' 1709 @echo ' headerdep - Detect inclusion cycles in headers' 1710 @echo ' coccicheck - Check with Coccinelle' 1711 @echo ' clang-analyzer - Check with clang static analyzer' 1712 @echo ' clang-tidy - Check with clang-tidy' 1713 @echo '' 1714 @echo 'Tools:' 1715 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1716 @echo '' 1717 @echo 'Kernel selftest:' 1718 @echo ' kselftest - Build and run kernel selftest' 1719 @echo ' Build, install, and boot kernel before' 1720 @echo ' running kselftest on it' 1721 @echo ' Run as root for full coverage' 1722 @echo ' kselftest-all - Build kernel selftest' 1723 @echo ' kselftest-install - Build and install kernel selftest' 1724 @echo ' kselftest-clean - Remove all generated kselftest files' 1725 @echo ' kselftest-merge - Merge all the config dependencies of' 1726 @echo ' kselftest to existing .config.' 1727 @echo '' 1728 @echo 'Rust targets:' 1729 @echo ' rustavailable - Checks whether the Rust toolchain is' 1730 @echo ' available and, if not, explains why.' 1731 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1732 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1733 @echo ' is formatted, printing a diff otherwise.' 1734 @echo ' rustdoc - Generate Rust documentation' 1735 @echo ' (requires kernel .config)' 1736 @echo ' rusttest - Runs the Rust tests' 1737 @echo ' (requires kernel .config; downloads external repos)' 1738 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1739 @echo ' (requires kernel .config)' 1740 @echo ' dir/file.[os] - Build specified target only' 1741 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1742 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1743 @echo ' The output is not intended to be compilable.' 1744 @echo ' dir/file.ll - Build the LLVM assembly file' 1745 @echo '' 1746 @$(if $(dtstree), \ 1747 echo 'Devicetree:'; \ 1748 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1749 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1750 echo ' dt_binding_check - Validate device tree binding documents'; \ 1751 echo ' dtbs_check - Validate device tree source files';\ 1752 echo '') 1753 1754 @echo 'Userspace tools targets:' 1755 @echo ' use "make tools/help"' 1756 @echo ' or "cd tools; make help"' 1757 @echo '' 1758 @echo 'Kernel packaging:' 1759 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1760 @echo '' 1761 @echo 'Documentation targets:' 1762 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1763 @echo '' 1764 @echo 'Architecture specific targets ($(SRCARCH)):' 1765 @$(or $(archhelp),\ 1766 echo ' No architecture specific help defined for $(SRCARCH)') 1767 @echo '' 1768 @$(if $(boards), \ 1769 $(foreach b, $(boards), \ 1770 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1771 echo '') 1772 @$(if $(board-dirs), \ 1773 $(foreach b, $(board-dirs), \ 1774 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1775 printf " %-16s - Show all of the above\\n" help-boards; \ 1776 echo '') 1777 1778 @echo ' make V=n [targets] 1: verbose build' 1779 @echo ' 2: give reason for rebuild of target' 1780 @echo ' V=1 and V=2 can be combined with V=12' 1781 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1782 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1783 @echo ' (sparse by default)' 1784 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1785 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1786 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1787 @echo ' 1: warnings which may be relevant and do not occur too often' 1788 @echo ' 2: warnings which occur quite often but may still be relevant' 1789 @echo ' 3: more obscure warnings, can most likely be ignored' 1790 @echo ' e: warnings are being treated as errors' 1791 @echo ' Multiple levels can be combined with W=12 or W=123' 1792 @$(if $(dtstree), \ 1793 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1794 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1795 ) 1796 @echo '' 1797 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1798 @echo 'For further info see the ./README file' 1799 1800 1801help-board-dirs := $(addprefix help-,$(board-dirs)) 1802 1803help-boards: $(help-board-dirs) 1804 1805boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1806 1807$(help-board-dirs): help-%: 1808 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1809 @$(if $(boards-per-dir), \ 1810 $(foreach b, $(boards-per-dir), \ 1811 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1812 echo '') 1813 1814 1815# Documentation targets 1816# --------------------------------------------------------------------------- 1817DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1818 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1819PHONY += $(DOC_TARGETS) 1820$(DOC_TARGETS): 1821 $(Q)$(MAKE) $(build)=Documentation $@ 1822 1823 1824# Rust targets 1825# --------------------------------------------------------------------------- 1826 1827# "Is Rust available?" target 1828PHONY += rustavailable 1829rustavailable: 1830 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1831 1832# Documentation target 1833# 1834# Using the singular to avoid running afoul of `no-dot-config-targets`. 1835PHONY += rustdoc 1836rustdoc: prepare 1837 $(Q)$(MAKE) $(build)=rust $@ 1838 1839# Testing target 1840PHONY += rusttest 1841rusttest: prepare 1842 $(Q)$(MAKE) $(build)=rust $@ 1843 1844# Formatting targets 1845PHONY += rustfmt rustfmtcheck 1846 1847# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1848# 1849# We match using absolute paths since `find` does not resolve them 1850# when matching, which is a problem when e.g. `srctree` is `..`. 1851# We `grep` afterwards in order to remove the directory entry itself. 1852rustfmt: 1853 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1854 -o -path $(abs_srctree)/rust/alloc -prune \ 1855 -o -path $(abs_objtree)/rust/test -prune \ 1856 | grep -Fv $(abs_srctree)/rust/alloc \ 1857 | grep -Fv $(abs_objtree)/rust/test \ 1858 | grep -Fv generated \ 1859 | xargs $(RUSTFMT) $(rustfmt_flags) 1860 1861rustfmtcheck: rustfmt_flags = --check 1862rustfmtcheck: rustfmt 1863 1864# IDE support targets 1865PHONY += rust-analyzer 1866rust-analyzer: 1867 $(Q)$(MAKE) $(build)=rust $@ 1868 1869# Misc 1870# --------------------------------------------------------------------------- 1871 1872PHONY += misc-check 1873misc-check: 1874 $(Q)$(srctree)/scripts/misc-check 1875 1876all: misc-check 1877 1878PHONY += scripts_gdb 1879scripts_gdb: prepare0 1880 $(Q)$(MAKE) $(build)=scripts/gdb 1881 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1882 1883ifdef CONFIG_GDB_SCRIPTS 1884all: scripts_gdb 1885endif 1886 1887else # KBUILD_EXTMOD 1888 1889### 1890# External module support. 1891# When building external modules the kernel used as basis is considered 1892# read-only, and no consistency checks are made and the make 1893# system is not used on the basis kernel. If updates are required 1894# in the basis kernel ordinary make commands (without M=...) must be used. 1895 1896# We are always building only modules. 1897KBUILD_BUILTIN := 1898KBUILD_MODULES := 1 1899 1900build-dir := $(KBUILD_EXTMOD) 1901 1902compile_commands.json: $(extmod_prefix)compile_commands.json 1903PHONY += compile_commands.json 1904 1905clean-dirs := $(KBUILD_EXTMOD) 1906clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1907 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1908 1909PHONY += prepare 1910# now expand this into a simple variable to reduce the cost of shell evaluations 1911prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1912prepare: 1913 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1914 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1915 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1916 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1917 fi 1918 1919PHONY += help 1920help: 1921 @echo ' Building external modules.' 1922 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1923 @echo '' 1924 @echo ' modules - default target, build the module(s)' 1925 @echo ' modules_install - install the module' 1926 @echo ' clean - remove generated files in module directory only' 1927 @echo '' 1928 1929endif # KBUILD_EXTMOD 1930 1931# --------------------------------------------------------------------------- 1932# Modules 1933 1934PHONY += modules modules_install modules_prepare 1935 1936ifdef CONFIG_MODULES 1937 1938$(MODORDER): $(build-dir) 1939 @: 1940 1941# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1942# This is solely useful to speed up test compiles. 1943modules: modpost 1944ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1945 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1946endif 1947 1948PHONY += modules_check 1949modules_check: $(MODORDER) 1950 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1951 1952quiet_cmd_depmod = DEPMOD $(MODLIB) 1953 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1954 $(KERNELRELEASE) 1955 1956modules_install: 1957 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1958 $(call cmd,depmod) 1959 1960else # CONFIG_MODULES 1961 1962# Modules not configured 1963# --------------------------------------------------------------------------- 1964 1965modules modules_install: 1966 @echo >&2 '***' 1967 @echo >&2 '*** The present kernel configuration has modules disabled.' 1968 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1969 @echo >&2 '*** to enable CONFIG_MODULES.' 1970 @echo >&2 '***' 1971 @exit 1 1972 1973KBUILD_MODULES := 1974 1975endif # CONFIG_MODULES 1976 1977PHONY += modpost 1978modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1979 $(if $(KBUILD_MODULES), modules_check) 1980 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1981 1982# Single targets 1983# --------------------------------------------------------------------------- 1984# To build individual files in subdirectories, you can do like this: 1985# 1986# make foo/bar/baz.s 1987# 1988# The supported suffixes for single-target are listed in 'single-targets' 1989# 1990# To build only under specific subdirectories, you can do like this: 1991# 1992# make foo/bar/baz/ 1993 1994ifdef single-build 1995 1996# .ko is special because modpost is needed 1997single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1998single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1999 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2000 2001$(single-ko): single_modules 2002 @: 2003$(single-no-ko): $(build-dir) 2004 @: 2005 2006# Remove MODORDER when done because it is not the real one. 2007PHONY += single_modules 2008single_modules: $(single-no-ko) modules_prepare 2009 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2010 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2011ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2012 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2013endif 2014 $(Q)rm -f $(MODORDER) 2015 2016single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2017 2018KBUILD_MODULES := 1 2019 2020endif 2021 2022# Preset locale variables to speed up the build process. Limit locale 2023# tweaks to this spot to avoid wrong language settings when running 2024# make menuconfig etc. 2025# Error messages still appears in the original language 2026PHONY += $(build-dir) 2027$(build-dir): prepare 2028 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2029 2030clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2031PHONY += $(clean-dirs) clean 2032$(clean-dirs): 2033 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2034 2035clean: $(clean-dirs) 2036 $(call cmd,rmfiles) 2037 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2038 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2039 -o -name '*.ko.*' \ 2040 -o -name '*.dtb' -o -name '*.dtbo' \ 2041 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2042 -o -name '*.dt.yaml' \ 2043 -o -name '*.dwo' -o -name '*.lst' \ 2044 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2045 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2046 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2047 -o -name '*.asn1.[ch]' \ 2048 -o -name '*.symtypes' -o -name 'modules.order' \ 2049 -o -name '*.c.[012]*.*' \ 2050 -o -name '*.ll' \ 2051 -o -name '*.gcno' \ 2052 -o -name '*.*.symversions' \) -type f -print \ 2053 -o -name '.tmp_*' -print \ 2054 | xargs rm -rf 2055 2056# Generate tags for editors 2057# --------------------------------------------------------------------------- 2058quiet_cmd_tags = GEN $@ 2059 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2060 2061tags TAGS cscope gtags: FORCE 2062 $(call cmd,tags) 2063 2064# Script to generate missing namespace dependencies 2065# --------------------------------------------------------------------------- 2066 2067PHONY += nsdeps 2068nsdeps: export KBUILD_NSDEPS=1 2069nsdeps: modules 2070 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2071 2072# Clang Tooling 2073# --------------------------------------------------------------------------- 2074 2075quiet_cmd_gen_compile_commands = GEN $@ 2076 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2077 2078$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2079 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2080 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2081 $(call if_changed,gen_compile_commands) 2082 2083targets += $(extmod_prefix)compile_commands.json 2084 2085PHONY += clang-tidy clang-analyzer 2086 2087ifdef CONFIG_CC_IS_CLANG 2088quiet_cmd_clang_tools = CHECK $< 2089 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2090 2091clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2092 $(call cmd,clang_tools) 2093else 2094clang-tidy clang-analyzer: 2095 @echo "$@ requires CC=clang" >&2 2096 @false 2097endif 2098 2099# Scripts to check various things for consistency 2100# --------------------------------------------------------------------------- 2101 2102PHONY += includecheck versioncheck coccicheck export_report 2103 2104includecheck: 2105 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2106 -name '*.[hcS]' -type f -print | sort \ 2107 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2108 2109versioncheck: 2110 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2111 -name '*.[hcS]' -type f -print | sort \ 2112 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2113 2114coccicheck: 2115 $(Q)$(BASH) $(srctree)/scripts/$@ 2116 2117export_report: 2118 $(PERL) $(srctree)/scripts/export_report.pl 2119 2120PHONY += checkstack kernelrelease kernelversion image_name 2121 2122# UML needs a little special treatment here. It wants to use the host 2123# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2124# else wants $(ARCH), including people doing cross-builds, which means 2125# that $(SUBARCH) doesn't work here. 2126ifeq ($(ARCH), um) 2127CHECKSTACK_ARCH := $(SUBARCH) 2128else 2129CHECKSTACK_ARCH := $(ARCH) 2130endif 2131checkstack: 2132 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2133 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2134 2135kernelrelease: 2136 @$(filechk_kernel.release) 2137 2138kernelversion: 2139 @echo $(KERNELVERSION) 2140 2141image_name: 2142 @echo $(KBUILD_IMAGE) 2143 2144quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2145 cmd_rmfiles = rm -rf $(rm-files) 2146 2147# read saved command lines for existing targets 2148existing-targets := $(wildcard $(sort $(targets))) 2149 2150-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2151 2152endif # config-build 2153endif # mixed-build 2154endif # need-sub-make 2155 2156PHONY += FORCE 2157FORCE: 2158 2159# Declare the contents of the PHONY variable as phony. We keep that 2160# information in a variable so we can use it in if_changed and friends. 2161.PHONY: $(PHONY) 2162