1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 6NAME = Hurr durr I'ma ninja sloth 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41ifneq ($(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) $(build)=scripts/basic 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=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_ 106KBUILD_VERBOSE = 0 107endif 108 109export quiet Q KBUILD_VERBOSE 110 111# Call a source code checker (by default, "sparse") as part of the 112# C compilation. 113# 114# Use 'make C=1' to enable checking of only re-compiled files. 115# Use 'make C=2' to enable checking of *all* source files, regardless 116# of whether they are re-compiled or not. 117# 118# See the file "Documentation/dev-tools/sparse.rst" for more details, 119# including where to get the "sparse" utility. 120 121ifeq ("$(origin C)", "command line") 122 KBUILD_CHECKSRC = $(C) 123endif 124ifndef KBUILD_CHECKSRC 125 KBUILD_CHECKSRC = 0 126endif 127 128export KBUILD_CHECKSRC 129 130# Enable "clippy" (a linter) as part of the Rust compilation. 131# 132# Use 'make CLIPPY=1' to enable it. 133ifeq ("$(origin CLIPPY)", "command line") 134 KBUILD_CLIPPY := $(CLIPPY) 135endif 136 137export KBUILD_CLIPPY 138 139# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 140# directory of external module to build. Setting M= takes precedence. 141ifeq ("$(origin M)", "command line") 142 KBUILD_EXTMOD := $(M) 143endif 144 145$(if $(word 2, $(KBUILD_EXTMOD)), \ 146 $(error building multiple external modules is not supported)) 147 148$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 149 $(error module directory path cannot contain '$x'))) 150 151# Remove trailing slashes 152ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 153KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 154endif 155 156export KBUILD_EXTMOD 157 158# Kbuild will save output files in the current working directory. 159# This does not need to match to the root of the kernel source tree. 160# 161# For example, you can do this: 162# 163# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 164# 165# If you want to save output files in a different location, there are 166# two syntaxes to specify it. 167# 168# 1) O= 169# Use "make O=dir/to/store/output/files/" 170# 171# 2) Set KBUILD_OUTPUT 172# Set the environment variable KBUILD_OUTPUT to point to the output directory. 173# export KBUILD_OUTPUT=dir/to/store/output/files/; make 174# 175# The O= assignment takes precedence over the KBUILD_OUTPUT environment 176# variable. 177 178# Do we want to change the working directory? 179ifeq ("$(origin O)", "command line") 180 KBUILD_OUTPUT := $(O) 181endif 182 183ifneq ($(KBUILD_OUTPUT),) 184# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 185# expand a shell special character '~'. We use a somewhat tedious way here. 186abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 187$(if $(abs_objtree),, \ 188 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 189 190# $(realpath ...) resolves symlinks 191abs_objtree := $(realpath $(abs_objtree)) 192else 193abs_objtree := $(CURDIR) 194endif # ifneq ($(KBUILD_OUTPUT),) 195 196ifeq ($(abs_objtree),$(CURDIR)) 197# Suppress "Entering directory ..." unless we are changing the work directory. 198MAKEFLAGS += --no-print-directory 199else 200need-sub-make := 1 201endif 202 203this-makefile := $(lastword $(MAKEFILE_LIST)) 204abs_srctree := $(realpath $(dir $(this-makefile))) 205 206ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 207$(error source directory cannot contain spaces or colons) 208endif 209 210ifneq ($(abs_srctree),$(abs_objtree)) 211# Look for make include files relative to root of kernel src 212# 213# --included-dir is added for backward compatibility, but you should not rely on 214# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 215MAKEFLAGS += --include-dir=$(abs_srctree) 216endif 217 218ifneq ($(filter 3.%,$(MAKE_VERSION)),) 219# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 220# We need to invoke sub-make to avoid implicit rules in the top Makefile. 221need-sub-make := 1 222# Cancel implicit rules for this Makefile. 223$(this-makefile): ; 224endif 225 226export abs_srctree abs_objtree 227export sub_make_done := 1 228 229ifeq ($(need-sub-make),1) 230 231PHONY += $(MAKECMDGOALS) __sub-make 232 233$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 234 @: 235 236# Invoke a second make in the output directory, passing relevant variables 237__sub-make: 238 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 239 240endif # need-sub-make 241endif # sub_make_done 242 243# We process the rest of the Makefile if this is the final invocation of make 244ifeq ($(need-sub-make),) 245 246# Do not print "Entering directory ...", 247# but we want to display it when entering to the output directory 248# so that IDEs/editors are able to understand relative filenames. 249MAKEFLAGS += --no-print-directory 250 251ifeq ($(abs_srctree),$(abs_objtree)) 252 # building in the source tree 253 srctree := . 254 building_out_of_srctree := 255else 256 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 257 # building in a subdirectory of the source tree 258 srctree := .. 259 else 260 srctree := $(abs_srctree) 261 endif 262 building_out_of_srctree := 1 263endif 264 265ifneq ($(KBUILD_ABS_SRCTREE),) 266srctree := $(abs_srctree) 267endif 268 269objtree := . 270VPATH := $(srctree) 271 272export building_out_of_srctree srctree objtree VPATH 273 274# To make sure we do not include .config for any of the *config targets 275# catch them early, and hand them over to scripts/kconfig/Makefile 276# It is allowed to specify more targets when calling make, including 277# mixing *config targets and build targets. 278# For example 'make oldconfig all'. 279# Detect when mixed targets is specified, and make a second invocation 280# of make so .config is not included in this case either (for *config). 281 282version_h := include/generated/uapi/linux/version.h 283 284clean-targets := %clean mrproper cleandocs 285no-dot-config-targets := $(clean-targets) \ 286 cscope gtags TAGS tags help% %docs check% coccicheck \ 287 $(version_h) headers headers_% archheaders archscripts \ 288 %asm-generic kernelversion %src-pkg dt_binding_check \ 289 outputmakefile rustavailable rustfmt rustfmtcheck 290# Installation targets should not require compiler. Unfortunately, vdso_install 291# is an exception where build artifacts may be updated. This must be fixed. 292no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 293 headers_install modules_install kernelrelease image_name 294no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 295 image_name 296single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 297 298config-build := 299mixed-build := 300need-config := 1 301need-compiler := 1 302may-sync-config := 1 303single-build := 304 305ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 306 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 307 need-config := 308 endif 309endif 310 311ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 312 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 313 need-compiler := 314 endif 315endif 316 317ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 318 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 319 may-sync-config := 320 endif 321endif 322 323ifneq ($(KBUILD_EXTMOD),) 324 may-sync-config := 325endif 326 327ifeq ($(KBUILD_EXTMOD),) 328 ifneq ($(filter %config,$(MAKECMDGOALS)),) 329 config-build := 1 330 ifneq ($(words $(MAKECMDGOALS)),1) 331 mixed-build := 1 332 endif 333 endif 334endif 335 336# We cannot build single targets and the others at the same time 337ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 338 single-build := 1 339 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 340 mixed-build := 1 341 endif 342endif 343 344# For "make -j clean all", "make -j mrproper defconfig all", etc. 345ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 346 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 347 mixed-build := 1 348 endif 349endif 350 351# install and modules_install need also be processed one by one 352ifneq ($(filter install,$(MAKECMDGOALS)),) 353 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 354 mixed-build := 1 355 endif 356endif 357 358ifdef mixed-build 359# =========================================================================== 360# We're called with mixed targets (*config and build targets). 361# Handle them one by one. 362 363PHONY += $(MAKECMDGOALS) __build_one_by_one 364 365$(MAKECMDGOALS): __build_one_by_one 366 @: 367 368__build_one_by_one: 369 $(Q)set -e; \ 370 for i in $(MAKECMDGOALS); do \ 371 $(MAKE) -f $(srctree)/Makefile $$i; \ 372 done 373 374else # !mixed-build 375 376include $(srctree)/scripts/Kbuild.include 377 378# Read KERNELRELEASE from include/config/kernel.release (if it exists) 379KERNELRELEASE = $(call read-file, include/config/kernel.release) 380KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 381export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 382 383include $(srctree)/scripts/subarch.include 384 385# Cross compiling and selecting different set of gcc/bin-utils 386# --------------------------------------------------------------------------- 387# 388# When performing cross compilation for other architectures ARCH shall be set 389# to the target architecture. (See arch/* for the possibilities). 390# ARCH can be set during invocation of make: 391# make ARCH=ia64 392# Another way is to have ARCH set in the environment. 393# The default ARCH is the host where make is executed. 394 395# CROSS_COMPILE specify the prefix used for all executables used 396# during compilation. Only gcc and related bin-utils executables 397# are prefixed with $(CROSS_COMPILE). 398# CROSS_COMPILE can be set on the command line 399# make CROSS_COMPILE=ia64-linux- 400# Alternatively CROSS_COMPILE can be set in the environment. 401# Default value for CROSS_COMPILE is not to prefix executables 402# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 403ARCH ?= $(SUBARCH) 404 405# Architecture as present in compile.h 406UTS_MACHINE := $(ARCH) 407SRCARCH := $(ARCH) 408 409# Additional ARCH settings for x86 410ifeq ($(ARCH),i386) 411 SRCARCH := x86 412endif 413ifeq ($(ARCH),x86_64) 414 SRCARCH := x86 415endif 416 417# Additional ARCH settings for sparc 418ifeq ($(ARCH),sparc32) 419 SRCARCH := sparc 420endif 421ifeq ($(ARCH),sparc64) 422 SRCARCH := sparc 423endif 424 425# Additional ARCH settings for parisc 426ifeq ($(ARCH),parisc64) 427 SRCARCH := parisc 428endif 429 430export cross_compiling := 431ifneq ($(SRCARCH),$(SUBARCH)) 432cross_compiling := 1 433endif 434 435KCONFIG_CONFIG ?= .config 436export KCONFIG_CONFIG 437 438# SHELL used by kbuild 439CONFIG_SHELL := sh 440 441HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 442HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 443HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 444 445ifneq ($(LLVM),) 446ifneq ($(filter %/,$(LLVM)),) 447LLVM_PREFIX := $(LLVM) 448else ifneq ($(filter -%,$(LLVM)),) 449LLVM_SUFFIX := $(LLVM) 450endif 451 452HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 453HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 454else 455HOSTCC = gcc 456HOSTCXX = g++ 457endif 458HOSTRUSTC = rustc 459HOSTPKG_CONFIG = pkg-config 460 461KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 462 -O2 -fomit-frame-pointer -std=gnu11 \ 463 -Wdeclaration-after-statement 464KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 465KBUILD_USERLDFLAGS := $(USERLDFLAGS) 466 467# These flags apply to all Rust code in the tree, including the kernel and 468# host programs. 469export rust_common_flags := --edition=2021 \ 470 -Zbinary_dep_depinfo=y \ 471 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 472 -Dunreachable_pub -Dnon_ascii_idents \ 473 -Wmissing_docs \ 474 -Drustdoc::missing_crate_level_docs \ 475 -Dclippy::correctness -Dclippy::style \ 476 -Dclippy::suspicious -Dclippy::complexity \ 477 -Dclippy::perf \ 478 -Dclippy::let_unit_value -Dclippy::mut_mut \ 479 -Dclippy::needless_bitwise_bool \ 480 -Dclippy::needless_continue \ 481 -Wclippy::dbg_macro 482 483KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 484KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 485KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 486 -Zallow-features= $(HOSTRUSTFLAGS) 487KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 488KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 489 490# Make variables (CC, etc...) 491CPP = $(CC) -E 492ifneq ($(LLVM),) 493CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 494LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 495AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 496NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 497OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 498OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 499READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 500STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 501else 502CC = $(CROSS_COMPILE)gcc 503LD = $(CROSS_COMPILE)ld 504AR = $(CROSS_COMPILE)ar 505NM = $(CROSS_COMPILE)nm 506OBJCOPY = $(CROSS_COMPILE)objcopy 507OBJDUMP = $(CROSS_COMPILE)objdump 508READELF = $(CROSS_COMPILE)readelf 509STRIP = $(CROSS_COMPILE)strip 510endif 511RUSTC = rustc 512RUSTDOC = rustdoc 513RUSTFMT = rustfmt 514CLIPPY_DRIVER = clippy-driver 515BINDGEN = bindgen 516CARGO = cargo 517PAHOLE = pahole 518RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 519LEX = flex 520YACC = bison 521AWK = awk 522INSTALLKERNEL := installkernel 523DEPMOD = depmod 524PERL = perl 525PYTHON3 = python3 526CHECK = sparse 527BASH = bash 528KGZIP = gzip 529KBZIP2 = bzip2 530KLZOP = lzop 531LZMA = lzma 532LZ4 = lz4c 533XZ = xz 534ZSTD = zstd 535 536PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 537 538CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 539 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 540NOSTDINC_FLAGS := 541CFLAGS_MODULE = 542RUSTFLAGS_MODULE = 543AFLAGS_MODULE = 544LDFLAGS_MODULE = 545CFLAGS_KERNEL = 546RUSTFLAGS_KERNEL = 547AFLAGS_KERNEL = 548LDFLAGS_vmlinux = 549 550# Use USERINCLUDE when you must reference the UAPI directories only. 551USERINCLUDE := \ 552 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 553 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 554 -I$(srctree)/include/uapi \ 555 -I$(objtree)/include/generated/uapi \ 556 -include $(srctree)/include/linux/compiler-version.h \ 557 -include $(srctree)/include/linux/kconfig.h 558 559# Use LINUXINCLUDE when you must reference the include/ directory. 560# Needed to be compatible with the O= option 561LINUXINCLUDE := \ 562 -I$(srctree)/arch/$(SRCARCH)/include \ 563 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 564 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 565 -I$(objtree)/include \ 566 $(USERINCLUDE) 567 568KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 569KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 570 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 571 -Werror=implicit-function-declaration -Werror=implicit-int \ 572 -Werror=return-type -Wno-format-security -funsigned-char \ 573 -std=gnu11 574KBUILD_CPPFLAGS := -D__KERNEL__ 575KBUILD_RUSTFLAGS := $(rust_common_flags) \ 576 --target=$(objtree)/rust/target.json \ 577 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 578 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 579 -Csymbol-mangling-version=v0 \ 580 -Crelocation-model=static \ 581 -Zfunction-sections=n \ 582 -Dclippy::float_arithmetic 583 584KBUILD_AFLAGS_KERNEL := 585KBUILD_CFLAGS_KERNEL := 586KBUILD_RUSTFLAGS_KERNEL := 587KBUILD_AFLAGS_MODULE := -DMODULE 588KBUILD_CFLAGS_MODULE := -DMODULE 589KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 590KBUILD_LDFLAGS_MODULE := 591KBUILD_LDFLAGS := 592CLANG_FLAGS := 593 594ifeq ($(KBUILD_CLIPPY),1) 595 RUSTC_OR_CLIPPY_QUIET := CLIPPY 596 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 597else 598 RUSTC_OR_CLIPPY_QUIET := RUSTC 599 RUSTC_OR_CLIPPY = $(RUSTC) 600endif 601 602ifdef RUST_LIB_SRC 603 export RUST_LIB_SRC 604endif 605 606# Allows the usage of unstable features in stable compilers. 607export RUSTC_BOOTSTRAP := 1 608 609export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 610export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 611export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 612export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 613export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 614export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 615export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 616export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 617 618export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 619export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 620export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 621export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 622export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 623export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 624export PAHOLE_FLAGS 625 626# Files to ignore in find ... statements 627 628export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 629 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 630 -prune -o 631export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 632 --exclude CVS --exclude .pc --exclude .hg --exclude .git 633 634# =========================================================================== 635# Rules shared between *config targets and build targets 636 637# Basic helpers built in scripts/basic/ 638PHONY += scripts_basic 639scripts_basic: 640 $(Q)$(MAKE) $(build)=scripts/basic 641 642PHONY += outputmakefile 643ifdef building_out_of_srctree 644# Before starting out-of-tree build, make sure the source tree is clean. 645# outputmakefile generates a Makefile in the output directory, if using a 646# separate output directory. This allows convenient use of make in the 647# output directory. 648# At the same time when output Makefile generated, generate .gitignore to 649# ignore whole output directory 650 651quiet_cmd_makefile = GEN Makefile 652 cmd_makefile = { \ 653 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 654 echo "include $(srctree)/Makefile"; \ 655 } > Makefile 656 657outputmakefile: 658 @if [ -f $(srctree)/.config -o \ 659 -d $(srctree)/include/config -o \ 660 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 661 echo >&2 "***"; \ 662 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 663 echo >&2 "*** in $(abs_srctree)";\ 664 echo >&2 "***"; \ 665 false; \ 666 fi 667 $(Q)ln -fsn $(srctree) source 668 $(call cmd,makefile) 669 $(Q)test -e .gitignore || \ 670 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 671endif 672 673# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 674# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 675# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 676# and from include/config/auto.conf.cmd to detect the compiler upgrade. 677CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 678 679ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 680include $(srctree)/scripts/Makefile.clang 681endif 682 683# Include this also for config targets because some architectures need 684# cc-cross-prefix to determine CROSS_COMPILE. 685ifdef need-compiler 686include $(srctree)/scripts/Makefile.compiler 687endif 688 689ifdef config-build 690# =========================================================================== 691# *config targets only - make sure prerequisites are updated, and descend 692# in scripts/kconfig to make the *config target 693 694# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 695# KBUILD_DEFCONFIG may point out an alternative default configuration 696# used for 'make defconfig' 697include $(srctree)/arch/$(SRCARCH)/Makefile 698export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 699 700config: outputmakefile scripts_basic FORCE 701 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 702 703%config: outputmakefile scripts_basic FORCE 704 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 705 706else #!config-build 707# =========================================================================== 708# Build targets only - this includes vmlinux, arch specific targets, clean 709# targets and others. In general all targets except *config targets. 710 711# If building an external module we do not care about the all: rule 712# but instead __all depend on modules 713PHONY += all 714ifeq ($(KBUILD_EXTMOD),) 715__all: all 716else 717__all: modules 718endif 719 720targets := 721 722# Decide whether to build built-in, modular, or both. 723# Normally, just do built-in. 724 725KBUILD_MODULES := 726KBUILD_BUILTIN := 1 727 728# If we have only "make modules", don't compile built-in objects. 729ifeq ($(MAKECMDGOALS),modules) 730 KBUILD_BUILTIN := 731endif 732 733# If we have "make <whatever> modules", compile modules 734# in addition to whatever we do anyway. 735# Just "make" or "make all" shall build modules as well 736 737ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 738 KBUILD_MODULES := 1 739endif 740 741ifeq ($(MAKECMDGOALS),) 742 KBUILD_MODULES := 1 743endif 744 745export KBUILD_MODULES KBUILD_BUILTIN 746 747ifdef need-config 748include include/config/auto.conf 749endif 750 751ifeq ($(KBUILD_EXTMOD),) 752# Objects we will link into vmlinux / subdirs we need to visit 753core-y := 754drivers-y := 755libs-y := lib/ 756endif # KBUILD_EXTMOD 757 758# The all: target is the default when no target is given on the 759# command line. 760# This allow a user to issue only 'make' to build a kernel including modules 761# Defaults to vmlinux, but the arch makefile usually adds further targets 762all: vmlinux 763 764CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 765ifdef CONFIG_CC_IS_GCC 766CFLAGS_GCOV += -fno-tree-loop-im 767endif 768export CFLAGS_GCOV 769 770# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 771ifdef CONFIG_FUNCTION_TRACER 772 CC_FLAGS_FTRACE := -pg 773endif 774 775include $(srctree)/arch/$(SRCARCH)/Makefile 776 777ifdef need-config 778ifdef may-sync-config 779# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 780# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 781# because some architectures define CROSS_COMPILE there. 782include include/config/auto.conf.cmd 783 784$(KCONFIG_CONFIG): 785 @echo >&2 '***' 786 @echo >&2 '*** Configuration file "$@" not found!' 787 @echo >&2 '***' 788 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 789 @echo >&2 '*** "make menuconfig" or "make xconfig").' 790 @echo >&2 '***' 791 @/bin/false 792 793# The actual configuration files used during the build are stored in 794# include/generated/ and include/config/. Update them if .config is newer than 795# include/config/auto.conf (which mirrors .config). 796# 797# This exploits the 'multi-target pattern rule' trick. 798# The syncconfig should be executed only once to make all the targets. 799# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 800# 801# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 802# so you cannot notice that Kconfig is waiting for the user input. 803%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 804 $(Q)$(kecho) " SYNC $@" 805 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 806else # !may-sync-config 807# External modules and some install targets need include/generated/autoconf.h 808# and include/config/auto.conf but do not care if they are up-to-date. 809# Use auto.conf to trigger the test 810PHONY += include/config/auto.conf 811 812include/config/auto.conf: 813 @test -e include/generated/autoconf.h -a -e $@ || ( \ 814 echo >&2; \ 815 echo >&2 " ERROR: Kernel configuration is invalid."; \ 816 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 817 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 818 echo >&2 ; \ 819 /bin/false) 820 821endif # may-sync-config 822endif # need-config 823 824KBUILD_CFLAGS += -fno-delete-null-pointer-checks 825KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 826KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 827KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 828KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 829 830ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 831KBUILD_CFLAGS += -O2 832KBUILD_RUSTFLAGS += -Copt-level=2 833else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 834KBUILD_CFLAGS += -Os 835KBUILD_RUSTFLAGS += -Copt-level=s 836endif 837 838# Always set `debug-assertions` and `overflow-checks` because their default 839# depends on `opt-level` and `debug-assertions`, respectively. 840KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 841KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 842 843# Tell gcc to never replace conditional load with a non-conditional one 844ifdef CONFIG_CC_IS_GCC 845# gcc-10 renamed --param=allow-store-data-races=0 to 846# -fno-allow-store-data-races. 847KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 848KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 849endif 850 851ifdef CONFIG_READABLE_ASM 852# Disable optimizations that make assembler listings hard to read. 853# reorder blocks reorders the control in the function 854# ipa clone creates specialized cloned functions 855# partial inlining inlines only parts of functions 856KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 857endif 858 859ifneq ($(CONFIG_FRAME_WARN),0) 860KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 861endif 862 863stackp-flags-y := -fno-stack-protector 864stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 865stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 866 867KBUILD_CFLAGS += $(stackp-flags-y) 868 869KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 870KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 871KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 872 873KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 874KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 875 876ifdef CONFIG_CC_IS_CLANG 877KBUILD_CPPFLAGS += -Qunused-arguments 878# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 879KBUILD_CFLAGS += -Wno-gnu 880else 881 882# gcc inanely warns about local variables called 'main' 883KBUILD_CFLAGS += -Wno-main 884endif 885 886# These warnings generated too much noise in a regular build. 887# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 888KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 889KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 890 891# These result in bogus false positives 892KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 893 894ifdef CONFIG_FRAME_POINTER 895KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 896KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 897else 898# Some targets (ARM with Thumb2, for example), can't be built with frame 899# pointers. For those, we don't have FUNCTION_TRACER automatically 900# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 901# incompatible with -fomit-frame-pointer with current GCC, so we don't use 902# -fomit-frame-pointer with FUNCTION_TRACER. 903# In the Rust target specification, "frame-pointer" is set explicitly 904# to "may-omit". 905ifndef CONFIG_FUNCTION_TRACER 906KBUILD_CFLAGS += -fomit-frame-pointer 907endif 908endif 909 910# Initialize all stack variables with a 0xAA pattern. 911ifdef CONFIG_INIT_STACK_ALL_PATTERN 912KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 913endif 914 915# Initialize all stack variables with a zero value. 916ifdef CONFIG_INIT_STACK_ALL_ZERO 917KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 918ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 919# https://github.com/llvm/llvm-project/issues/44842 920KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 921endif 922endif 923 924# While VLAs have been removed, GCC produces unreachable stack probes 925# for the randomize_kstack_offset feature. Disable it for all compilers. 926KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 927 928# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 929ifdef CONFIG_ZERO_CALL_USED_REGS 930KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 931endif 932 933ifdef CONFIG_FUNCTION_TRACER 934ifdef CONFIG_FTRACE_MCOUNT_USE_CC 935 CC_FLAGS_FTRACE += -mrecord-mcount 936 ifdef CONFIG_HAVE_NOP_MCOUNT 937 ifeq ($(call cc-option-yn, -mnop-mcount),y) 938 CC_FLAGS_FTRACE += -mnop-mcount 939 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 940 endif 941 endif 942endif 943ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 944 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 945 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 946 endif 947endif 948ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 949 ifdef CONFIG_HAVE_C_RECORDMCOUNT 950 BUILD_C_RECORDMCOUNT := y 951 export BUILD_C_RECORDMCOUNT 952 endif 953endif 954ifdef CONFIG_HAVE_FENTRY 955 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 956 ifeq ($(call cc-option-yn, -mfentry),y) 957 CC_FLAGS_FTRACE += -mfentry 958 CC_FLAGS_USING += -DCC_USING_FENTRY 959 endif 960endif 961export CC_FLAGS_FTRACE 962KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 963KBUILD_AFLAGS += $(CC_FLAGS_USING) 964endif 965 966# We trigger additional mismatches with less inlining 967ifdef CONFIG_DEBUG_SECTION_MISMATCH 968KBUILD_CFLAGS += -fno-inline-functions-called-once 969endif 970 971# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 972ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 973KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 974KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 975LDFLAGS_vmlinux += --gc-sections 976endif 977 978ifdef CONFIG_SHADOW_CALL_STACK 979ifndef CONFIG_DYNAMIC_SCS 980CC_FLAGS_SCS := -fsanitize=shadow-call-stack 981KBUILD_CFLAGS += $(CC_FLAGS_SCS) 982endif 983export CC_FLAGS_SCS 984endif 985 986ifdef CONFIG_LTO_CLANG 987ifdef CONFIG_LTO_CLANG_THIN 988CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 989KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 990else 991CC_FLAGS_LTO := -flto 992endif 993CC_FLAGS_LTO += -fvisibility=hidden 994 995# Limit inlining across translation units to reduce binary size 996KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 997 998# Check for frame size exceeding threshold during prolog/epilog insertion 999# when using lld < 13.0.0. 1000ifneq ($(CONFIG_FRAME_WARN),0) 1001ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 1002KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 1003endif 1004endif 1005endif 1006 1007ifdef CONFIG_LTO 1008KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1009KBUILD_AFLAGS += -fno-lto 1010export CC_FLAGS_LTO 1011endif 1012 1013ifdef CONFIG_CFI_CLANG 1014CC_FLAGS_CFI := -fsanitize=kcfi 1015KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1016export CC_FLAGS_CFI 1017endif 1018 1019ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1020KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1021endif 1022 1023# arch Makefile may override CC so keep this after arch Makefile is included 1024NOSTDINC_FLAGS += -nostdinc 1025 1026# warn about C99 declaration after statement 1027KBUILD_CFLAGS += -Wdeclaration-after-statement 1028 1029# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1030KBUILD_CFLAGS += -Wvla 1031 1032# disable pointer signed / unsigned warnings in gcc 4.0 1033KBUILD_CFLAGS += -Wno-pointer-sign 1034 1035# In order to make sure new function cast mismatches are not introduced 1036# in the kernel (to avoid tripping CFI checking), the kernel should be 1037# globally built with -Wcast-function-type. 1038KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1039 1040# disable stringop warnings in gcc 8+ 1041KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1042 1043# We'll want to enable this eventually, but it's not going away for 5.7 at least 1044KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1045 1046# Another good warning that we'll want to enable eventually 1047KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1048 1049# Enabled with W=2, disabled by default as noisy 1050ifdef CONFIG_CC_IS_GCC 1051KBUILD_CFLAGS += -Wno-maybe-uninitialized 1052endif 1053 1054# The allocators already balk at large sizes, so silence the compiler 1055# warnings for bounds checks involving those possible values. While 1056# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1057# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1058# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1059# doesn't work (as it is documented to), silently resolving to "0" prior to 1060# version 9.1 (and producing an error more recently). Numeric values larger 1061# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1062# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1063# choice, we must perform a versioned check to disable this warning. 1064# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1065KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1066KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1067 1068# disable invalid "can't wrap" optimizations for signed / pointers 1069KBUILD_CFLAGS += -fno-strict-overflow 1070 1071# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1072KBUILD_CFLAGS += -fno-stack-check 1073 1074# conserve stack if available 1075ifdef CONFIG_CC_IS_GCC 1076KBUILD_CFLAGS += -fconserve-stack 1077endif 1078 1079# Prohibit date/time macros, which would make the build non-deterministic 1080KBUILD_CFLAGS += -Werror=date-time 1081 1082# enforce correct pointer usage 1083KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1084 1085# Require designated initializers for all marked structures 1086KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1087 1088# change __FILE__ to the relative path from the srctree 1089KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1090 1091# include additional Makefiles when needed 1092include-y := scripts/Makefile.extrawarn 1093include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1094include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1095include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1096include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1097include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1098include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1099include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1100include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1101 1102include $(addprefix $(srctree)/, $(include-y)) 1103 1104# scripts/Makefile.gcc-plugins is intentionally included last. 1105# Do not add $(call cc-option,...) below this line. When you build the kernel 1106# from the clean source tree, the GCC plugins do not exist at this point. 1107 1108# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1109KBUILD_CPPFLAGS += $(KCPPFLAGS) 1110KBUILD_AFLAGS += $(KAFLAGS) 1111KBUILD_CFLAGS += $(KCFLAGS) 1112KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1113 1114KBUILD_LDFLAGS_MODULE += --build-id=sha1 1115LDFLAGS_vmlinux += --build-id=sha1 1116 1117KBUILD_LDFLAGS += -z noexecstack 1118ifeq ($(CONFIG_LD_IS_BFD),y) 1119KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1120endif 1121 1122ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1123LDFLAGS_vmlinux += -X 1124endif 1125 1126ifeq ($(CONFIG_RELR),y) 1127LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1128endif 1129 1130# We never want expected sections to be placed heuristically by the 1131# linker. All sections should be explicitly named in the linker script. 1132ifdef CONFIG_LD_ORPHAN_WARN 1133LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1134endif 1135 1136# Align the bit size of userspace programs with the kernel 1137KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1138KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1139 1140# make the checker run with the right architecture 1141CHECKFLAGS += --arch=$(ARCH) 1142 1143# insure the checker run with the right endianness 1144CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1145 1146# the checker needs the correct machine size 1147CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1148 1149# Default kernel image to build when no specific target is given. 1150# KBUILD_IMAGE may be overruled on the command line or 1151# set in the environment 1152# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1153# this default value 1154export KBUILD_IMAGE ?= vmlinux 1155 1156# 1157# INSTALL_PATH specifies where to place the updated kernel and system map 1158# images. Default is /boot, but you can set it to other values 1159export INSTALL_PATH ?= /boot 1160 1161# 1162# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1163# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1164# an argument if needed. Otherwise it defaults to the kernel install path 1165# 1166export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1167 1168# 1169# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1170# relocations required by build roots. This is not defined in the 1171# makefile but the argument can be passed to make if needed. 1172# 1173 1174MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1175export MODLIB 1176 1177PHONY += prepare0 1178 1179export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1180export MODORDER := $(extmod_prefix)modules.order 1181export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1182 1183ifeq ($(KBUILD_EXTMOD),) 1184 1185build-dir := . 1186clean-dirs := $(sort . Documentation \ 1187 $(patsubst %/,%,$(filter %/, $(core-) \ 1188 $(drivers-) $(libs-)))) 1189 1190export ARCH_CORE := $(core-y) 1191export ARCH_LIB := $(filter %/, $(libs-y)) 1192export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1193# Externally visible symbols (used by link-vmlinux.sh) 1194 1195KBUILD_VMLINUX_OBJS := ./built-in.a 1196ifdef CONFIG_MODULES 1197KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1198KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1199else 1200KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1201endif 1202 1203export KBUILD_VMLINUX_LIBS 1204export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1205 1206# Recurse until adjust_autoksyms.sh is satisfied 1207PHONY += autoksyms_recursive 1208ifdef CONFIG_TRIM_UNUSED_KSYMS 1209# For the kernel to actually contain only the needed exported symbols, 1210# we have to build modules as well to determine what those symbols are. 1211# (this can be evaluated only once include/config/auto.conf has been included) 1212KBUILD_MODULES := 1 1213 1214autoksyms_recursive: $(build-dir) modules.order 1215 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1216 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1217endif 1218 1219autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1220 1221quiet_cmd_autoksyms_h = GEN $@ 1222 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1223 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1224 1225$(autoksyms_h): 1226 $(call cmd,autoksyms_h) 1227 1228# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1229quiet_cmd_ar_vmlinux.a = AR $@ 1230 cmd_ar_vmlinux.a = \ 1231 rm -f $@; \ 1232 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1233 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1234 1235targets += vmlinux.a 1236vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1237 $(call if_changed,ar_vmlinux.a) 1238 1239PHONY += vmlinux_o 1240vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1241 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1242 1243vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1244 @: 1245 1246PHONY += vmlinux 1247# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1248# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1249# unrelated; the decompressors just happen to have the same base name, 1250# arch/*/boot/compressed/vmlinux. 1251# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1252# 1253# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1254# https://savannah.gnu.org/bugs/?61463 1255# For Make > 4.4, the following simple code will work: 1256# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1257vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1258vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1259vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1260 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1261 1262# The actual objects are generated when descending, 1263# make sure no implicit rule kicks in 1264$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1265 1266filechk_kernel.release = \ 1267 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1268 1269# Store (new) KERNELRELEASE string in include/config/kernel.release 1270include/config/kernel.release: FORCE 1271 $(call filechk,kernel.release) 1272 1273# Additional helpers built in scripts/ 1274# Carefully list dependencies so we do not try to build scripts twice 1275# in parallel 1276PHONY += scripts 1277scripts: scripts_basic scripts_dtc 1278 $(Q)$(MAKE) $(build)=$(@) 1279 1280# Things we need to do before we recursively start building the kernel 1281# or the modules are listed in "prepare". 1282# A multi level approach is used. prepareN is processed before prepareN-1. 1283# archprepare is used in arch Makefiles and when processed asm symlink, 1284# version.h and scripts_basic is processed / created. 1285 1286PHONY += prepare archprepare 1287 1288archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1289 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1290 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1291 1292prepare0: archprepare 1293 $(Q)$(MAKE) $(build)=scripts/mod 1294 $(Q)$(MAKE) $(build)=. prepare 1295 1296# All the preparing.. 1297prepare: prepare0 1298ifdef CONFIG_RUST 1299 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1300 $(Q)$(MAKE) $(build)=rust 1301endif 1302 1303PHONY += remove-stale-files 1304remove-stale-files: 1305 $(Q)$(srctree)/scripts/remove-stale-files 1306 1307# Support for using generic headers in asm-generic 1308asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1309 1310PHONY += asm-generic uapi-asm-generic 1311asm-generic: uapi-asm-generic 1312 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1313 generic=include/asm-generic 1314uapi-asm-generic: 1315 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1316 generic=include/uapi/asm-generic 1317 1318# Generate some files 1319# --------------------------------------------------------------------------- 1320 1321# KERNELRELEASE can change from a few different places, meaning version.h 1322# needs to be updated, so this check is forced on all builds 1323 1324uts_len := 64 1325define filechk_utsrelease.h 1326 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1327 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1328 exit 1; \ 1329 fi; \ 1330 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1331endef 1332 1333define filechk_version.h 1334 if [ $(SUBLEVEL) -gt 255 ]; then \ 1335 echo \#define LINUX_VERSION_CODE $(shell \ 1336 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1337 else \ 1338 echo \#define LINUX_VERSION_CODE $(shell \ 1339 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1340 fi; \ 1341 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1342 ((c) > 255 ? 255 : (c)))'; \ 1343 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1344 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1345 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1346endef 1347 1348$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1349$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1350$(version_h): FORCE 1351 $(call filechk,version.h) 1352 1353include/generated/utsrelease.h: include/config/kernel.release FORCE 1354 $(call filechk,utsrelease.h) 1355 1356filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1357 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1358 1359include/generated/compile.h: FORCE 1360 $(call filechk,compile.h) 1361 1362PHONY += headerdep 1363headerdep: 1364 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1365 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1366 1367# --------------------------------------------------------------------------- 1368# Kernel headers 1369 1370#Default location for installed headers 1371export INSTALL_HDR_PATH = $(objtree)/usr 1372 1373quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1374 cmd_headers_install = \ 1375 mkdir -p $(INSTALL_HDR_PATH); \ 1376 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1377 usr/include $(INSTALL_HDR_PATH) 1378 1379PHONY += headers_install 1380headers_install: headers 1381 $(call cmd,headers_install) 1382 1383PHONY += archheaders archscripts 1384 1385hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1386 1387PHONY += headers 1388headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1389 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1390 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1391 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1392 1393ifdef CONFIG_HEADERS_INSTALL 1394prepare: headers 1395endif 1396 1397PHONY += scripts_unifdef 1398scripts_unifdef: scripts_basic 1399 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1400 1401# --------------------------------------------------------------------------- 1402# Install 1403 1404# Many distributions have the custom install script, /sbin/installkernel. 1405# If DKMS is installed, 'make install' will eventually recurse back 1406# to this Makefile to build and install external modules. 1407# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1408 1409quiet_cmd_install = INSTALL $(INSTALL_PATH) 1410 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1411 1412# --------------------------------------------------------------------------- 1413# Tools 1414 1415ifdef CONFIG_OBJTOOL 1416prepare: tools/objtool 1417endif 1418 1419ifdef CONFIG_BPF 1420ifdef CONFIG_DEBUG_INFO_BTF 1421prepare: tools/bpf/resolve_btfids 1422endif 1423endif 1424 1425PHONY += resolve_btfids_clean 1426 1427resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1428 1429# tools/bpf/resolve_btfids directory might not exist 1430# in output directory, skip its clean in that case 1431resolve_btfids_clean: 1432ifneq ($(wildcard $(resolve_btfids_O)),) 1433 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1434endif 1435 1436# Clear a bunch of variables before executing the submake 1437ifeq ($(quiet),silent_) 1438tools_silent=s 1439endif 1440 1441tools/: FORCE 1442 $(Q)mkdir -p $(objtree)/tools 1443 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1444 1445tools/%: FORCE 1446 $(Q)mkdir -p $(objtree)/tools 1447 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1448 1449# --------------------------------------------------------------------------- 1450# Kernel selftest 1451 1452PHONY += kselftest 1453kselftest: headers 1454 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1455 1456kselftest-%: headers FORCE 1457 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1458 1459PHONY += kselftest-merge 1460kselftest-merge: 1461 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1462 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1463 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1464 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1465 1466# --------------------------------------------------------------------------- 1467# Devicetree files 1468 1469ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1470dtstree := arch/$(SRCARCH)/boot/dts 1471endif 1472 1473ifneq ($(dtstree),) 1474 1475%.dtb: dtbs_prepare 1476 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1477 1478%.dtbo: dtbs_prepare 1479 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1480 1481PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1482dtbs: dtbs_prepare 1483 $(Q)$(MAKE) $(build)=$(dtstree) 1484 1485# include/config/kernel.release is actually needed when installing DTBs because 1486# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1487# dtbs_install depend on it as dtbs_install may run as root. 1488dtbs_prepare: include/config/kernel.release scripts_dtc 1489 1490ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1491export CHECK_DTBS=y 1492dtbs: dt_binding_check 1493endif 1494 1495dtbs_check: dtbs 1496 1497dtbs_install: 1498 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1499 1500ifdef CONFIG_OF_EARLY_FLATTREE 1501all: dtbs 1502endif 1503 1504endif 1505 1506PHONY += scripts_dtc 1507scripts_dtc: scripts_basic 1508 $(Q)$(MAKE) $(build)=scripts/dtc 1509 1510ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1511export CHECK_DT_BINDING=y 1512endif 1513 1514PHONY += dt_binding_check 1515dt_binding_check: scripts_dtc 1516 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1517 1518PHONY += dt_compatible_check 1519dt_compatible_check: dt_binding_check 1520 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1521 1522# --------------------------------------------------------------------------- 1523# Modules 1524 1525ifdef CONFIG_MODULES 1526 1527# By default, build modules as well 1528 1529all: modules 1530 1531# When we're building modules with modversions, we need to consider 1532# the built-in objects during the descend as well, in order to 1533# make sure the checksums are up to date before we record them. 1534ifdef CONFIG_MODVERSIONS 1535 KBUILD_BUILTIN := 1 1536endif 1537 1538# Build modules 1539# 1540 1541# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES 1542# is an exception. 1543ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1544KBUILD_BUILTIN := 1 1545modules: vmlinux 1546endif 1547 1548modules: modules_prepare 1549 1550# Target to prepare building external modules 1551modules_prepare: prepare 1552 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1553 1554export modules_sign_only := 1555 1556ifeq ($(CONFIG_MODULE_SIG),y) 1557PHONY += modules_sign 1558modules_sign: modules_install 1559 @: 1560 1561# modules_sign is a subset of modules_install. 1562# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1563ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1564modules_sign_only := y 1565endif 1566endif 1567 1568modinst_pre := 1569ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1570modinst_pre := __modinst_pre 1571endif 1572 1573modules_install: $(modinst_pre) 1574PHONY += __modinst_pre 1575__modinst_pre: 1576 @rm -rf $(MODLIB)/kernel 1577 @rm -f $(MODLIB)/source 1578 @mkdir -p $(MODLIB)/kernel 1579 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1580 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1581 rm -f $(MODLIB)/build ; \ 1582 ln -s $(CURDIR) $(MODLIB)/build ; \ 1583 fi 1584 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1585 @cp -f modules.builtin $(MODLIB)/ 1586 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1587 1588endif # CONFIG_MODULES 1589 1590### 1591# Cleaning is done on three levels. 1592# make clean Delete most generated files 1593# Leave enough to build external modules 1594# make mrproper Delete the current configuration, and all generated files 1595# make distclean Remove editor backup files, patch leftover files and the like 1596 1597# Directories & files removed with 'make clean' 1598CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1599 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1600 compile_commands.json .thinlto-cache rust/test rust/doc \ 1601 .vmlinux.objs .vmlinux.export.c 1602 1603# Directories & files removed with 'make mrproper' 1604MRPROPER_FILES += include/config include/generated \ 1605 arch/$(SRCARCH)/include/generated .objdiff \ 1606 debian snap tar-install \ 1607 .config .config.old .version \ 1608 Module.symvers \ 1609 certs/signing_key.pem \ 1610 certs/x509.genkey \ 1611 vmlinux-gdb.py \ 1612 *.spec \ 1613 rust/target.json rust/libmacros.so 1614 1615# clean - Delete most, but leave enough to build external modules 1616# 1617clean: rm-files := $(CLEAN_FILES) 1618 1619PHONY += archclean vmlinuxclean 1620 1621vmlinuxclean: 1622 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1623 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1624 1625clean: archclean vmlinuxclean resolve_btfids_clean 1626 1627# mrproper - Delete all generated files, including .config 1628# 1629mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1630mrproper-dirs := $(addprefix _mrproper_,scripts) 1631 1632PHONY += $(mrproper-dirs) mrproper 1633$(mrproper-dirs): 1634 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1635 1636mrproper: clean $(mrproper-dirs) 1637 $(call cmd,rmfiles) 1638 @find . $(RCS_FIND_IGNORE) \ 1639 \( -name '*.rmeta' \) \ 1640 -type f -print | xargs rm -f 1641 1642# distclean 1643# 1644PHONY += distclean 1645 1646distclean: mrproper 1647 @find . $(RCS_FIND_IGNORE) \ 1648 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1649 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1650 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1651 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1652 -type f -print | xargs rm -f 1653 1654 1655# Packaging of the kernel to various formats 1656# --------------------------------------------------------------------------- 1657 1658%src-pkg: FORCE 1659 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1660%pkg: include/config/kernel.release FORCE 1661 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 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=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1779 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1780 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1781 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1782 @echo ' (sparse by default)' 1783 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1784 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1785 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1786 @echo ' 1: warnings which may be relevant and do not occur too often' 1787 @echo ' 2: warnings which occur quite often but may still be relevant' 1788 @echo ' 3: more obscure warnings, can most likely be ignored' 1789 @echo ' e: warnings are being treated as errors' 1790 @echo ' Multiple levels can be combined with W=12 or W=123' 1791 @echo '' 1792 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1793 @echo 'For further info see the ./README file' 1794 1795 1796help-board-dirs := $(addprefix help-,$(board-dirs)) 1797 1798help-boards: $(help-board-dirs) 1799 1800boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1801 1802$(help-board-dirs): help-%: 1803 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1804 @$(if $(boards-per-dir), \ 1805 $(foreach b, $(boards-per-dir), \ 1806 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1807 echo '') 1808 1809 1810# Documentation targets 1811# --------------------------------------------------------------------------- 1812DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1813 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1814PHONY += $(DOC_TARGETS) 1815$(DOC_TARGETS): 1816 $(Q)$(MAKE) $(build)=Documentation $@ 1817 1818 1819# Rust targets 1820# --------------------------------------------------------------------------- 1821 1822# "Is Rust available?" target 1823PHONY += rustavailable 1824rustavailable: 1825 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1826 1827# Documentation target 1828# 1829# Using the singular to avoid running afoul of `no-dot-config-targets`. 1830PHONY += rustdoc 1831rustdoc: prepare 1832 $(Q)$(MAKE) $(build)=rust $@ 1833 1834# Testing target 1835PHONY += rusttest 1836rusttest: prepare 1837 $(Q)$(MAKE) $(build)=rust $@ 1838 1839# Formatting targets 1840PHONY += rustfmt rustfmtcheck 1841 1842# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1843# 1844# We match using absolute paths since `find` does not resolve them 1845# when matching, which is a problem when e.g. `srctree` is `..`. 1846# We `grep` afterwards in order to remove the directory entry itself. 1847rustfmt: 1848 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1849 -o -path $(abs_srctree)/rust/alloc -prune \ 1850 -o -path $(abs_objtree)/rust/test -prune \ 1851 | grep -Fv $(abs_srctree)/rust/alloc \ 1852 | grep -Fv $(abs_objtree)/rust/test \ 1853 | grep -Fv generated \ 1854 | xargs $(RUSTFMT) $(rustfmt_flags) 1855 1856rustfmtcheck: rustfmt_flags = --check 1857rustfmtcheck: rustfmt 1858 1859# IDE support targets 1860PHONY += rust-analyzer 1861rust-analyzer: 1862 $(Q)$(MAKE) $(build)=rust $@ 1863 1864# Misc 1865# --------------------------------------------------------------------------- 1866 1867PHONY += scripts_gdb 1868scripts_gdb: prepare0 1869 $(Q)$(MAKE) $(build)=scripts/gdb 1870 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1871 1872ifdef CONFIG_GDB_SCRIPTS 1873all: scripts_gdb 1874endif 1875 1876else # KBUILD_EXTMOD 1877 1878### 1879# External module support. 1880# When building external modules the kernel used as basis is considered 1881# read-only, and no consistency checks are made and the make 1882# system is not used on the basis kernel. If updates are required 1883# in the basis kernel ordinary make commands (without M=...) must be used. 1884 1885# We are always building only modules. 1886KBUILD_BUILTIN := 1887KBUILD_MODULES := 1 1888 1889build-dir := $(KBUILD_EXTMOD) 1890 1891compile_commands.json: $(extmod_prefix)compile_commands.json 1892PHONY += compile_commands.json 1893 1894clean-dirs := $(KBUILD_EXTMOD) 1895clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1896 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1897 1898PHONY += prepare 1899# now expand this into a simple variable to reduce the cost of shell evaluations 1900prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1901prepare: 1902 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1903 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1904 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1905 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1906 fi 1907 1908PHONY += help 1909help: 1910 @echo ' Building external modules.' 1911 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1912 @echo '' 1913 @echo ' modules - default target, build the module(s)' 1914 @echo ' modules_install - install the module' 1915 @echo ' clean - remove generated files in module directory only' 1916 @echo '' 1917 1918endif # KBUILD_EXTMOD 1919 1920# --------------------------------------------------------------------------- 1921# Modules 1922 1923PHONY += modules modules_install modules_prepare 1924 1925ifdef CONFIG_MODULES 1926 1927$(MODORDER): $(build-dir) 1928 @: 1929 1930# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1931# This is solely useful to speed up test compiles. 1932modules: modpost 1933ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1934 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1935endif 1936 1937PHONY += modules_check 1938modules_check: $(MODORDER) 1939 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1940 1941quiet_cmd_depmod = DEPMOD $(MODLIB) 1942 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1943 $(KERNELRELEASE) 1944 1945modules_install: 1946 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1947 $(call cmd,depmod) 1948 1949else # CONFIG_MODULES 1950 1951# Modules not configured 1952# --------------------------------------------------------------------------- 1953 1954modules modules_install: 1955 @echo >&2 '***' 1956 @echo >&2 '*** The present kernel configuration has modules disabled.' 1957 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1958 @echo >&2 '*** to enable CONFIG_MODULES.' 1959 @echo >&2 '***' 1960 @exit 1 1961 1962KBUILD_MODULES := 1963 1964endif # CONFIG_MODULES 1965 1966PHONY += modpost 1967modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1968 $(if $(KBUILD_MODULES), modules_check) 1969 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1970 1971# Single targets 1972# --------------------------------------------------------------------------- 1973# To build individual files in subdirectories, you can do like this: 1974# 1975# make foo/bar/baz.s 1976# 1977# The supported suffixes for single-target are listed in 'single-targets' 1978# 1979# To build only under specific subdirectories, you can do like this: 1980# 1981# make foo/bar/baz/ 1982 1983ifdef single-build 1984 1985# .ko is special because modpost is needed 1986single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1987single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1988 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1989 1990$(single-ko): single_modules 1991 @: 1992$(single-no-ko): $(build-dir) 1993 @: 1994 1995# Remove MODORDER when done because it is not the real one. 1996PHONY += single_modules 1997single_modules: $(single-no-ko) modules_prepare 1998 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1999 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2000ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2001 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2002endif 2003 $(Q)rm -f $(MODORDER) 2004 2005single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2006 2007KBUILD_MODULES := 1 2008 2009endif 2010 2011# Preset locale variables to speed up the build process. Limit locale 2012# tweaks to this spot to avoid wrong language settings when running 2013# make menuconfig etc. 2014# Error messages still appears in the original language 2015PHONY += $(build-dir) 2016$(build-dir): prepare 2017 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2018 2019clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2020PHONY += $(clean-dirs) clean 2021$(clean-dirs): 2022 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2023 2024clean: $(clean-dirs) 2025 $(call cmd,rmfiles) 2026 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2027 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2028 -o -name '*.ko.*' \ 2029 -o -name '*.dtb' -o -name '*.dtbo' \ 2030 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2031 -o -name '*.dt.yaml' \ 2032 -o -name '*.dwo' -o -name '*.lst' \ 2033 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2034 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2035 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2036 -o -name '*.asn1.[ch]' \ 2037 -o -name '*.symtypes' -o -name 'modules.order' \ 2038 -o -name '.tmp_*' \ 2039 -o -name '*.c.[012]*.*' \ 2040 -o -name '*.ll' \ 2041 -o -name '*.gcno' \ 2042 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 2043 2044# Generate tags for editors 2045# --------------------------------------------------------------------------- 2046quiet_cmd_tags = GEN $@ 2047 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2048 2049tags TAGS cscope gtags: FORCE 2050 $(call cmd,tags) 2051 2052# Script to generate missing namespace dependencies 2053# --------------------------------------------------------------------------- 2054 2055PHONY += nsdeps 2056nsdeps: export KBUILD_NSDEPS=1 2057nsdeps: modules 2058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2059 2060# Clang Tooling 2061# --------------------------------------------------------------------------- 2062 2063quiet_cmd_gen_compile_commands = GEN $@ 2064 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2065 2066$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2067 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2068 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2069 $(call if_changed,gen_compile_commands) 2070 2071targets += $(extmod_prefix)compile_commands.json 2072 2073PHONY += clang-tidy clang-analyzer 2074 2075ifdef CONFIG_CC_IS_CLANG 2076quiet_cmd_clang_tools = CHECK $< 2077 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2078 2079clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2080 $(call cmd,clang_tools) 2081else 2082clang-tidy clang-analyzer: 2083 @echo "$@ requires CC=clang" >&2 2084 @false 2085endif 2086 2087# Scripts to check various things for consistency 2088# --------------------------------------------------------------------------- 2089 2090PHONY += includecheck versioncheck coccicheck export_report 2091 2092includecheck: 2093 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2094 -name '*.[hcS]' -type f -print | sort \ 2095 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2096 2097versioncheck: 2098 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2099 -name '*.[hcS]' -type f -print | sort \ 2100 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2101 2102coccicheck: 2103 $(Q)$(BASH) $(srctree)/scripts/$@ 2104 2105export_report: 2106 $(PERL) $(srctree)/scripts/export_report.pl 2107 2108PHONY += checkstack kernelrelease kernelversion image_name 2109 2110# UML needs a little special treatment here. It wants to use the host 2111# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2112# else wants $(ARCH), including people doing cross-builds, which means 2113# that $(SUBARCH) doesn't work here. 2114ifeq ($(ARCH), um) 2115CHECKSTACK_ARCH := $(SUBARCH) 2116else 2117CHECKSTACK_ARCH := $(ARCH) 2118endif 2119checkstack: 2120 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2121 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2122 2123kernelrelease: 2124 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 2125 2126kernelversion: 2127 @echo $(KERNELVERSION) 2128 2129image_name: 2130 @echo $(KBUILD_IMAGE) 2131 2132quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2133 cmd_rmfiles = rm -rf $(rm-files) 2134 2135# read saved command lines for existing targets 2136existing-targets := $(wildcard $(sort $(targets))) 2137 2138-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2139 2140endif # config-build 2141endif # mixed-build 2142endif # need-sub-make 2143 2144PHONY += FORCE 2145FORCE: 2146 2147# Declare the contents of the PHONY variable as phony. We keep that 2148# information in a variable so we can use it in if_changed and friends. 2149.PHONY: $(PHONY) 2150