1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = -rc7 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# Normally, we echo the whole command before executing it. By making 60# that echo $($(quiet)$(cmd)), we now have the possibility to set 61# $(quiet) to choose other forms of output instead, e.g. 62# 63# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 64# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 65# 66# If $(quiet) is empty, the whole command will be printed. 67# If it is set to "quiet_", only the short version will be printed. 68# If it is set to "silent_", nothing will be printed at all, since 69# the variable $(silent_cmd_cc_o_c) doesn't exist. 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)ln $@ :< 75# 76# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 77# If KBUILD_VERBOSE equals 1 then the above command is displayed. 78# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 79# 80# To put more focus on warnings, be less verbose as default 81# Use 'make V=1' to see the full commands 82 83ifeq ("$(origin V)", "command line") 84 KBUILD_VERBOSE = $(V) 85endif 86ifndef KBUILD_VERBOSE 87 KBUILD_VERBOSE = 0 88endif 89 90ifeq ($(KBUILD_VERBOSE),1) 91 quiet = 92 Q = 93else 94 quiet=quiet_ 95 Q = @ 96endif 97 98# If the user is running make -s (silent mode), suppress echoing of 99# commands 100# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 101 102ifeq ($(filter 3.%,$(MAKE_VERSION)),) 103silence:=$(findstring s,$(firstword -$(MAKEFLAGS))) 104else 105silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS))) 106endif 107 108ifeq ($(silence),s) 109quiet=silent_ 110KBUILD_VERBOSE = 0 111endif 112 113export quiet Q KBUILD_VERBOSE 114 115# Call a source code checker (by default, "sparse") as part of the 116# C compilation. 117# 118# Use 'make C=1' to enable checking of only re-compiled files. 119# Use 'make C=2' to enable checking of *all* source files, regardless 120# of whether they are re-compiled or not. 121# 122# See the file "Documentation/dev-tools/sparse.rst" for more details, 123# including where to get the "sparse" utility. 124 125ifeq ("$(origin C)", "command line") 126 KBUILD_CHECKSRC = $(C) 127endif 128ifndef KBUILD_CHECKSRC 129 KBUILD_CHECKSRC = 0 130endif 131 132export KBUILD_CHECKSRC 133 134# Enable "clippy" (a linter) as part of the Rust compilation. 135# 136# Use 'make CLIPPY=1' to enable it. 137ifeq ("$(origin CLIPPY)", "command line") 138 KBUILD_CLIPPY := $(CLIPPY) 139endif 140 141export KBUILD_CLIPPY 142 143# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 144# directory of external module to build. Setting M= takes precedence. 145ifeq ("$(origin M)", "command line") 146 KBUILD_EXTMOD := $(M) 147endif 148 149$(if $(word 2, $(KBUILD_EXTMOD)), \ 150 $(error building multiple external modules is not supported)) 151 152$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 153 $(error module directory path cannot contain '$x'))) 154 155# Remove trailing slashes 156ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 157KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 158endif 159 160export KBUILD_EXTMOD 161 162# Kbuild will save output files in the current working directory. 163# This does not need to match to the root of the kernel source tree. 164# 165# For example, you can do this: 166# 167# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 168# 169# If you want to save output files in a different location, there are 170# two syntaxes to specify it. 171# 172# 1) O= 173# Use "make O=dir/to/store/output/files/" 174# 175# 2) Set KBUILD_OUTPUT 176# Set the environment variable KBUILD_OUTPUT to point to the output directory. 177# export KBUILD_OUTPUT=dir/to/store/output/files/; make 178# 179# The O= assignment takes precedence over the KBUILD_OUTPUT environment 180# variable. 181 182# Do we want to change the working directory? 183ifeq ("$(origin O)", "command line") 184 KBUILD_OUTPUT := $(O) 185endif 186 187ifneq ($(KBUILD_OUTPUT),) 188# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 189# expand a shell special character '~'. We use a somewhat tedious way here. 190abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 191$(if $(abs_objtree),, \ 192 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 193 194# $(realpath ...) resolves symlinks 195abs_objtree := $(realpath $(abs_objtree)) 196else 197abs_objtree := $(CURDIR) 198endif # ifneq ($(KBUILD_OUTPUT),) 199 200ifeq ($(abs_objtree),$(CURDIR)) 201# Suppress "Entering directory ..." unless we are changing the work directory. 202MAKEFLAGS += --no-print-directory 203else 204need-sub-make := 1 205endif 206 207this-makefile := $(lastword $(MAKEFILE_LIST)) 208abs_srctree := $(realpath $(dir $(this-makefile))) 209 210ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 211$(error source directory cannot contain spaces or colons) 212endif 213 214ifneq ($(abs_srctree),$(abs_objtree)) 215# Look for make include files relative to root of kernel src 216# 217# --included-dir is added for backward compatibility, but you should not rely on 218# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 219MAKEFLAGS += --include-dir=$(abs_srctree) 220endif 221 222ifneq ($(filter 3.%,$(MAKE_VERSION)),) 223# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 224# We need to invoke sub-make to avoid implicit rules in the top Makefile. 225need-sub-make := 1 226# Cancel implicit rules for this Makefile. 227$(this-makefile): ; 228endif 229 230export abs_srctree abs_objtree 231export sub_make_done := 1 232 233ifeq ($(need-sub-make),1) 234 235PHONY += $(MAKECMDGOALS) __sub-make 236 237$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 238 @: 239 240# Invoke a second make in the output directory, passing relevant variables 241__sub-make: 242 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 243 244endif # need-sub-make 245endif # sub_make_done 246 247# We process the rest of the Makefile if this is the final invocation of make 248ifeq ($(need-sub-make),) 249 250# Do not print "Entering directory ...", 251# but we want to display it when entering to the output directory 252# so that IDEs/editors are able to understand relative filenames. 253MAKEFLAGS += --no-print-directory 254 255ifeq ($(abs_srctree),$(abs_objtree)) 256 # building in the source tree 257 srctree := . 258 building_out_of_srctree := 259else 260 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 261 # building in a subdirectory of the source tree 262 srctree := .. 263 else 264 srctree := $(abs_srctree) 265 endif 266 building_out_of_srctree := 1 267endif 268 269ifneq ($(KBUILD_ABS_SRCTREE),) 270srctree := $(abs_srctree) 271endif 272 273objtree := . 274VPATH := $(srctree) 275 276export building_out_of_srctree srctree objtree VPATH 277 278# To make sure we do not include .config for any of the *config targets 279# catch them early, and hand them over to scripts/kconfig/Makefile 280# It is allowed to specify more targets when calling make, including 281# mixing *config targets and build targets. 282# For example 'make oldconfig all'. 283# Detect when mixed targets is specified, and make a second invocation 284# of make so .config is not included in this case either (for *config). 285 286version_h := include/generated/uapi/linux/version.h 287 288clean-targets := %clean mrproper cleandocs 289no-dot-config-targets := $(clean-targets) \ 290 cscope gtags TAGS tags help% %docs check% coccicheck \ 291 $(version_h) headers headers_% archheaders archscripts \ 292 %asm-generic kernelversion %src-pkg dt_binding_check \ 293 outputmakefile rustavailable rustfmt rustfmtcheck 294# Installation targets should not require compiler. Unfortunately, vdso_install 295# is an exception where build artifacts may be updated. This must be fixed. 296no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 297 headers_install modules_install kernelrelease image_name 298no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 299 image_name 300single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 301 302config-build := 303mixed-build := 304need-config := 1 305need-compiler := 1 306may-sync-config := 1 307single-build := 308 309ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 310 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 311 need-config := 312 endif 313endif 314 315ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 316 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 317 need-compiler := 318 endif 319endif 320 321ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 322 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 323 may-sync-config := 324 endif 325endif 326 327ifneq ($(KBUILD_EXTMOD),) 328 may-sync-config := 329endif 330 331ifeq ($(KBUILD_EXTMOD),) 332 ifneq ($(filter %config,$(MAKECMDGOALS)),) 333 config-build := 1 334 ifneq ($(words $(MAKECMDGOALS)),1) 335 mixed-build := 1 336 endif 337 endif 338endif 339 340# We cannot build single targets and the others at the same time 341ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 342 single-build := 1 343 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 344 mixed-build := 1 345 endif 346endif 347 348# For "make -j clean all", "make -j mrproper defconfig all", etc. 349ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 350 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 351 mixed-build := 1 352 endif 353endif 354 355# install and modules_install need also be processed one by one 356ifneq ($(filter install,$(MAKECMDGOALS)),) 357 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 358 mixed-build := 1 359 endif 360endif 361 362ifdef mixed-build 363# =========================================================================== 364# We're called with mixed targets (*config and build targets). 365# Handle them one by one. 366 367PHONY += $(MAKECMDGOALS) __build_one_by_one 368 369$(MAKECMDGOALS): __build_one_by_one 370 @: 371 372__build_one_by_one: 373 $(Q)set -e; \ 374 for i in $(MAKECMDGOALS); do \ 375 $(MAKE) -f $(srctree)/Makefile $$i; \ 376 done 377 378else # !mixed-build 379 380include $(srctree)/scripts/Kbuild.include 381 382# Read KERNELRELEASE from include/config/kernel.release (if it exists) 383KERNELRELEASE = $(call read-file, include/config/kernel.release) 384KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 385export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 386 387include $(srctree)/scripts/subarch.include 388 389# Cross compiling and selecting different set of gcc/bin-utils 390# --------------------------------------------------------------------------- 391# 392# When performing cross compilation for other architectures ARCH shall be set 393# to the target architecture. (See arch/* for the possibilities). 394# ARCH can be set during invocation of make: 395# make ARCH=ia64 396# Another way is to have ARCH set in the environment. 397# The default ARCH is the host where make is executed. 398 399# CROSS_COMPILE specify the prefix used for all executables used 400# during compilation. Only gcc and related bin-utils executables 401# are prefixed with $(CROSS_COMPILE). 402# CROSS_COMPILE can be set on the command line 403# make CROSS_COMPILE=ia64-linux- 404# Alternatively CROSS_COMPILE can be set in the environment. 405# Default value for CROSS_COMPILE is not to prefix executables 406# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 407ARCH ?= $(SUBARCH) 408 409# Architecture as present in compile.h 410UTS_MACHINE := $(ARCH) 411SRCARCH := $(ARCH) 412 413# Additional ARCH settings for x86 414ifeq ($(ARCH),i386) 415 SRCARCH := x86 416endif 417ifeq ($(ARCH),x86_64) 418 SRCARCH := x86 419endif 420 421# Additional ARCH settings for sparc 422ifeq ($(ARCH),sparc32) 423 SRCARCH := sparc 424endif 425ifeq ($(ARCH),sparc64) 426 SRCARCH := sparc 427endif 428 429# Additional ARCH settings for parisc 430ifeq ($(ARCH),parisc64) 431 SRCARCH := parisc 432endif 433 434export cross_compiling := 435ifneq ($(SRCARCH),$(SUBARCH)) 436cross_compiling := 1 437endif 438 439KCONFIG_CONFIG ?= .config 440export KCONFIG_CONFIG 441 442# SHELL used by kbuild 443CONFIG_SHELL := sh 444 445HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 446HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 447HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 448 449ifneq ($(LLVM),) 450ifneq ($(filter %/,$(LLVM)),) 451LLVM_PREFIX := $(LLVM) 452else ifneq ($(filter -%,$(LLVM)),) 453LLVM_SUFFIX := $(LLVM) 454endif 455 456HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 457HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 458else 459HOSTCC = gcc 460HOSTCXX = g++ 461endif 462HOSTRUSTC = rustc 463HOSTPKG_CONFIG = pkg-config 464 465KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 466 -O2 -fomit-frame-pointer -std=gnu11 \ 467 -Wdeclaration-after-statement 468KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 469KBUILD_USERLDFLAGS := $(USERLDFLAGS) 470 471# These flags apply to all Rust code in the tree, including the kernel and 472# host programs. 473export rust_common_flags := --edition=2021 \ 474 -Zbinary_dep_depinfo=y \ 475 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 476 -Dunreachable_pub -Dnon_ascii_idents \ 477 -Wmissing_docs \ 478 -Drustdoc::missing_crate_level_docs \ 479 -Dclippy::correctness -Dclippy::style \ 480 -Dclippy::suspicious -Dclippy::complexity \ 481 -Dclippy::perf \ 482 -Dclippy::let_unit_value -Dclippy::mut_mut \ 483 -Dclippy::needless_bitwise_bool \ 484 -Dclippy::needless_continue \ 485 -Wclippy::dbg_macro 486 487KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 488KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 489KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 490 -Zallow-features= $(HOSTRUSTFLAGS) 491KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 492KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 493 494# Make variables (CC, etc...) 495CPP = $(CC) -E 496ifneq ($(LLVM),) 497CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 498LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 499AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 500NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 501OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 502OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 503READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 504STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 505else 506CC = $(CROSS_COMPILE)gcc 507LD = $(CROSS_COMPILE)ld 508AR = $(CROSS_COMPILE)ar 509NM = $(CROSS_COMPILE)nm 510OBJCOPY = $(CROSS_COMPILE)objcopy 511OBJDUMP = $(CROSS_COMPILE)objdump 512READELF = $(CROSS_COMPILE)readelf 513STRIP = $(CROSS_COMPILE)strip 514endif 515RUSTC = rustc 516RUSTDOC = rustdoc 517RUSTFMT = rustfmt 518CLIPPY_DRIVER = clippy-driver 519BINDGEN = bindgen 520CARGO = cargo 521PAHOLE = pahole 522RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 523LEX = flex 524YACC = bison 525AWK = awk 526INSTALLKERNEL := installkernel 527DEPMOD = depmod 528PERL = perl 529PYTHON3 = python3 530CHECK = sparse 531BASH = bash 532KGZIP = gzip 533KBZIP2 = bzip2 534KLZOP = lzop 535LZMA = lzma 536LZ4 = lz4c 537XZ = xz 538ZSTD = zstd 539 540PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 541 542CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 543 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 544NOSTDINC_FLAGS := 545CFLAGS_MODULE = 546RUSTFLAGS_MODULE = 547AFLAGS_MODULE = 548LDFLAGS_MODULE = 549CFLAGS_KERNEL = 550RUSTFLAGS_KERNEL = 551AFLAGS_KERNEL = 552LDFLAGS_vmlinux = 553 554# Use USERINCLUDE when you must reference the UAPI directories only. 555USERINCLUDE := \ 556 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 557 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 558 -I$(srctree)/include/uapi \ 559 -I$(objtree)/include/generated/uapi \ 560 -include $(srctree)/include/linux/compiler-version.h \ 561 -include $(srctree)/include/linux/kconfig.h 562 563# Use LINUXINCLUDE when you must reference the include/ directory. 564# Needed to be compatible with the O= option 565LINUXINCLUDE := \ 566 -I$(srctree)/arch/$(SRCARCH)/include \ 567 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 568 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 569 -I$(objtree)/include \ 570 $(USERINCLUDE) 571 572KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 573KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 574 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 575 -Werror=implicit-function-declaration -Werror=implicit-int \ 576 -Werror=return-type -Wno-format-security -funsigned-char \ 577 -std=gnu11 578KBUILD_CPPFLAGS := -D__KERNEL__ 579KBUILD_RUSTFLAGS := $(rust_common_flags) \ 580 --target=$(objtree)/rust/target.json \ 581 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 582 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 583 -Csymbol-mangling-version=v0 \ 584 -Crelocation-model=static \ 585 -Zfunction-sections=n \ 586 -Dclippy::float_arithmetic 587 588KBUILD_AFLAGS_KERNEL := 589KBUILD_CFLAGS_KERNEL := 590KBUILD_RUSTFLAGS_KERNEL := 591KBUILD_AFLAGS_MODULE := -DMODULE 592KBUILD_CFLAGS_MODULE := -DMODULE 593KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 594KBUILD_LDFLAGS_MODULE := 595KBUILD_LDFLAGS := 596CLANG_FLAGS := 597 598ifeq ($(KBUILD_CLIPPY),1) 599 RUSTC_OR_CLIPPY_QUIET := CLIPPY 600 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 601else 602 RUSTC_OR_CLIPPY_QUIET := RUSTC 603 RUSTC_OR_CLIPPY = $(RUSTC) 604endif 605 606ifdef RUST_LIB_SRC 607 export RUST_LIB_SRC 608endif 609 610# Allows the usage of unstable features in stable compilers. 611export RUSTC_BOOTSTRAP := 1 612 613export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 614export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 615export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 616export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 617export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 618export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 619export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 620export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 621 622export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 623export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 624export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 625export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 626export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 627export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 628export PAHOLE_FLAGS 629 630# Files to ignore in find ... statements 631 632export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 633 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 634 -prune -o 635export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 636 --exclude CVS --exclude .pc --exclude .hg --exclude .git 637 638# =========================================================================== 639# Rules shared between *config targets and build targets 640 641# Basic helpers built in scripts/basic/ 642PHONY += scripts_basic 643scripts_basic: 644 $(Q)$(MAKE) $(build)=scripts/basic 645 646PHONY += outputmakefile 647ifdef building_out_of_srctree 648# Before starting out-of-tree build, make sure the source tree is clean. 649# outputmakefile generates a Makefile in the output directory, if using a 650# separate output directory. This allows convenient use of make in the 651# output directory. 652# At the same time when output Makefile generated, generate .gitignore to 653# ignore whole output directory 654 655quiet_cmd_makefile = GEN Makefile 656 cmd_makefile = { \ 657 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 658 echo "include $(srctree)/Makefile"; \ 659 } > Makefile 660 661outputmakefile: 662 @if [ -f $(srctree)/.config -o \ 663 -d $(srctree)/include/config -o \ 664 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 665 echo >&2 "***"; \ 666 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 667 echo >&2 "*** in $(abs_srctree)";\ 668 echo >&2 "***"; \ 669 false; \ 670 fi 671 $(Q)ln -fsn $(srctree) source 672 $(call cmd,makefile) 673 $(Q)test -e .gitignore || \ 674 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 675endif 676 677# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 678# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 679# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 680# and from include/config/auto.conf.cmd to detect the compiler upgrade. 681CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 682 683ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 684include $(srctree)/scripts/Makefile.clang 685endif 686 687# Include this also for config targets because some architectures need 688# cc-cross-prefix to determine CROSS_COMPILE. 689ifdef need-compiler 690include $(srctree)/scripts/Makefile.compiler 691endif 692 693ifdef config-build 694# =========================================================================== 695# *config targets only - make sure prerequisites are updated, and descend 696# in scripts/kconfig to make the *config target 697 698# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 699# KBUILD_DEFCONFIG may point out an alternative default configuration 700# used for 'make defconfig' 701include $(srctree)/arch/$(SRCARCH)/Makefile 702export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 703 704config: outputmakefile scripts_basic FORCE 705 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 706 707%config: outputmakefile scripts_basic FORCE 708 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 709 710else #!config-build 711# =========================================================================== 712# Build targets only - this includes vmlinux, arch specific targets, clean 713# targets and others. In general all targets except *config targets. 714 715# If building an external module we do not care about the all: rule 716# but instead __all depend on modules 717PHONY += all 718ifeq ($(KBUILD_EXTMOD),) 719__all: all 720else 721__all: modules 722endif 723 724targets := 725 726# Decide whether to build built-in, modular, or both. 727# Normally, just do built-in. 728 729KBUILD_MODULES := 730KBUILD_BUILTIN := 1 731 732# If we have only "make modules", don't compile built-in objects. 733ifeq ($(MAKECMDGOALS),modules) 734 KBUILD_BUILTIN := 735endif 736 737# If we have "make <whatever> modules", compile modules 738# in addition to whatever we do anyway. 739# Just "make" or "make all" shall build modules as well 740 741ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 742 KBUILD_MODULES := 1 743endif 744 745ifeq ($(MAKECMDGOALS),) 746 KBUILD_MODULES := 1 747endif 748 749export KBUILD_MODULES KBUILD_BUILTIN 750 751ifdef need-config 752include include/config/auto.conf 753endif 754 755ifeq ($(KBUILD_EXTMOD),) 756# Objects we will link into vmlinux / subdirs we need to visit 757core-y := 758drivers-y := 759libs-y := lib/ 760endif # KBUILD_EXTMOD 761 762# The all: target is the default when no target is given on the 763# command line. 764# This allow a user to issue only 'make' to build a kernel including modules 765# Defaults to vmlinux, but the arch makefile usually adds further targets 766all: vmlinux 767 768CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 769ifdef CONFIG_CC_IS_GCC 770CFLAGS_GCOV += -fno-tree-loop-im 771endif 772export CFLAGS_GCOV 773 774# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 775ifdef CONFIG_FUNCTION_TRACER 776 CC_FLAGS_FTRACE := -pg 777endif 778 779include $(srctree)/arch/$(SRCARCH)/Makefile 780 781ifdef need-config 782ifdef may-sync-config 783# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 784# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 785# because some architectures define CROSS_COMPILE there. 786include include/config/auto.conf.cmd 787 788$(KCONFIG_CONFIG): 789 @echo >&2 '***' 790 @echo >&2 '*** Configuration file "$@" not found!' 791 @echo >&2 '***' 792 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 793 @echo >&2 '*** "make menuconfig" or "make xconfig").' 794 @echo >&2 '***' 795 @/bin/false 796 797# The actual configuration files used during the build are stored in 798# include/generated/ and include/config/. Update them if .config is newer than 799# include/config/auto.conf (which mirrors .config). 800# 801# This exploits the 'multi-target pattern rule' trick. 802# The syncconfig should be executed only once to make all the targets. 803# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 804# 805# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 806# so you cannot notice that Kconfig is waiting for the user input. 807%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 808 $(Q)$(kecho) " SYNC $@" 809 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 810else # !may-sync-config 811# External modules and some install targets need include/generated/autoconf.h 812# and include/config/auto.conf but do not care if they are up-to-date. 813# Use auto.conf to trigger the test 814PHONY += include/config/auto.conf 815 816include/config/auto.conf: 817 @test -e include/generated/autoconf.h -a -e $@ || ( \ 818 echo >&2; \ 819 echo >&2 " ERROR: Kernel configuration is invalid."; \ 820 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 821 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 822 echo >&2 ; \ 823 /bin/false) 824 825endif # may-sync-config 826endif # need-config 827 828KBUILD_CFLAGS += -fno-delete-null-pointer-checks 829KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 830KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 831KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 832KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 833 834ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 835KBUILD_CFLAGS += -O2 836KBUILD_RUSTFLAGS += -Copt-level=2 837else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 838KBUILD_CFLAGS += -Os 839KBUILD_RUSTFLAGS += -Copt-level=s 840endif 841 842# Always set `debug-assertions` and `overflow-checks` because their default 843# depends on `opt-level` and `debug-assertions`, respectively. 844KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 845KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 846 847# Tell gcc to never replace conditional load with a non-conditional one 848ifdef CONFIG_CC_IS_GCC 849# gcc-10 renamed --param=allow-store-data-races=0 to 850# -fno-allow-store-data-races. 851KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 852KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 853endif 854 855ifdef CONFIG_READABLE_ASM 856# Disable optimizations that make assembler listings hard to read. 857# reorder blocks reorders the control in the function 858# ipa clone creates specialized cloned functions 859# partial inlining inlines only parts of functions 860KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 861endif 862 863ifneq ($(CONFIG_FRAME_WARN),0) 864KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 865endif 866 867stackp-flags-y := -fno-stack-protector 868stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 869stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 870 871KBUILD_CFLAGS += $(stackp-flags-y) 872 873KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 874KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 875KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 876 877KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 878KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 879 880ifdef CONFIG_CC_IS_CLANG 881KBUILD_CPPFLAGS += -Qunused-arguments 882# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 883KBUILD_CFLAGS += -Wno-gnu 884else 885 886# gcc inanely warns about local variables called 'main' 887KBUILD_CFLAGS += -Wno-main 888endif 889 890# These warnings generated too much noise in a regular build. 891# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 892KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 893KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 894 895# These result in bogus false positives 896KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 897 898ifdef CONFIG_FRAME_POINTER 899KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 900KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 901else 902# Some targets (ARM with Thumb2, for example), can't be built with frame 903# pointers. For those, we don't have FUNCTION_TRACER automatically 904# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 905# incompatible with -fomit-frame-pointer with current GCC, so we don't use 906# -fomit-frame-pointer with FUNCTION_TRACER. 907# In the Rust target specification, "frame-pointer" is set explicitly 908# to "may-omit". 909ifndef CONFIG_FUNCTION_TRACER 910KBUILD_CFLAGS += -fomit-frame-pointer 911endif 912endif 913 914# Initialize all stack variables with a 0xAA pattern. 915ifdef CONFIG_INIT_STACK_ALL_PATTERN 916KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 917endif 918 919# Initialize all stack variables with a zero value. 920ifdef CONFIG_INIT_STACK_ALL_ZERO 921KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 922ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 923# https://github.com/llvm/llvm-project/issues/44842 924KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 925endif 926endif 927 928# While VLAs have been removed, GCC produces unreachable stack probes 929# for the randomize_kstack_offset feature. Disable it for all compilers. 930KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 931 932# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 933ifdef CONFIG_ZERO_CALL_USED_REGS 934KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 935endif 936 937ifdef CONFIG_FUNCTION_TRACER 938ifdef CONFIG_FTRACE_MCOUNT_USE_CC 939 CC_FLAGS_FTRACE += -mrecord-mcount 940 ifdef CONFIG_HAVE_NOP_MCOUNT 941 ifeq ($(call cc-option-yn, -mnop-mcount),y) 942 CC_FLAGS_FTRACE += -mnop-mcount 943 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 944 endif 945 endif 946endif 947ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 948 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 949 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 950 endif 951endif 952ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 953 ifdef CONFIG_HAVE_C_RECORDMCOUNT 954 BUILD_C_RECORDMCOUNT := y 955 export BUILD_C_RECORDMCOUNT 956 endif 957endif 958ifdef CONFIG_HAVE_FENTRY 959 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 960 ifeq ($(call cc-option-yn, -mfentry),y) 961 CC_FLAGS_FTRACE += -mfentry 962 CC_FLAGS_USING += -DCC_USING_FENTRY 963 endif 964endif 965export CC_FLAGS_FTRACE 966KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 967KBUILD_AFLAGS += $(CC_FLAGS_USING) 968endif 969 970# We trigger additional mismatches with less inlining 971ifdef CONFIG_DEBUG_SECTION_MISMATCH 972KBUILD_CFLAGS += -fno-inline-functions-called-once 973endif 974 975# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 976ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 977KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 978KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 979LDFLAGS_vmlinux += --gc-sections 980endif 981 982ifdef CONFIG_SHADOW_CALL_STACK 983ifndef CONFIG_DYNAMIC_SCS 984CC_FLAGS_SCS := -fsanitize=shadow-call-stack 985KBUILD_CFLAGS += $(CC_FLAGS_SCS) 986endif 987export CC_FLAGS_SCS 988endif 989 990ifdef CONFIG_LTO_CLANG 991ifdef CONFIG_LTO_CLANG_THIN 992CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 993KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 994else 995CC_FLAGS_LTO := -flto 996endif 997CC_FLAGS_LTO += -fvisibility=hidden 998 999# Limit inlining across translation units to reduce binary size 1000KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1001 1002# Check for frame size exceeding threshold during prolog/epilog insertion 1003# when using lld < 13.0.0. 1004ifneq ($(CONFIG_FRAME_WARN),0) 1005ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 1006KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 1007endif 1008endif 1009endif 1010 1011ifdef CONFIG_LTO 1012KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1013KBUILD_AFLAGS += -fno-lto 1014export CC_FLAGS_LTO 1015endif 1016 1017ifdef CONFIG_CFI_CLANG 1018CC_FLAGS_CFI := -fsanitize=kcfi 1019KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1020export CC_FLAGS_CFI 1021endif 1022 1023ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1024KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1025endif 1026 1027# arch Makefile may override CC so keep this after arch Makefile is included 1028NOSTDINC_FLAGS += -nostdinc 1029 1030# warn about C99 declaration after statement 1031KBUILD_CFLAGS += -Wdeclaration-after-statement 1032 1033# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1034KBUILD_CFLAGS += -Wvla 1035 1036# disable pointer signed / unsigned warnings in gcc 4.0 1037KBUILD_CFLAGS += -Wno-pointer-sign 1038 1039# In order to make sure new function cast mismatches are not introduced 1040# in the kernel (to avoid tripping CFI checking), the kernel should be 1041# globally built with -Wcast-function-type. 1042KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1043 1044# disable stringop warnings in gcc 8+ 1045KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1046 1047# We'll want to enable this eventually, but it's not going away for 5.7 at least 1048KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1049 1050# Another good warning that we'll want to enable eventually 1051KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1052 1053# Enabled with W=2, disabled by default as noisy 1054ifdef CONFIG_CC_IS_GCC 1055KBUILD_CFLAGS += -Wno-maybe-uninitialized 1056endif 1057 1058# The allocators already balk at large sizes, so silence the compiler 1059# warnings for bounds checks involving those possible values. While 1060# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1061# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1062# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1063# doesn't work (as it is documented to), silently resolving to "0" prior to 1064# version 9.1 (and producing an error more recently). Numeric values larger 1065# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1066# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1067# choice, we must perform a versioned check to disable this warning. 1068# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1069KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1070KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1071 1072# disable invalid "can't wrap" optimizations for signed / pointers 1073KBUILD_CFLAGS += -fno-strict-overflow 1074 1075# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1076KBUILD_CFLAGS += -fno-stack-check 1077 1078# conserve stack if available 1079ifdef CONFIG_CC_IS_GCC 1080KBUILD_CFLAGS += -fconserve-stack 1081endif 1082 1083# Prohibit date/time macros, which would make the build non-deterministic 1084KBUILD_CFLAGS += -Werror=date-time 1085 1086# enforce correct pointer usage 1087KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1088 1089# Require designated initializers for all marked structures 1090KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1091 1092# change __FILE__ to the relative path from the srctree 1093KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1094 1095# include additional Makefiles when needed 1096include-y := scripts/Makefile.extrawarn 1097include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1098include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1099include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1100include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1101include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1102include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1103include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1104include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1105 1106include $(addprefix $(srctree)/, $(include-y)) 1107 1108# scripts/Makefile.gcc-plugins is intentionally included last. 1109# Do not add $(call cc-option,...) below this line. When you build the kernel 1110# from the clean source tree, the GCC plugins do not exist at this point. 1111 1112# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1113KBUILD_CPPFLAGS += $(KCPPFLAGS) 1114KBUILD_AFLAGS += $(KAFLAGS) 1115KBUILD_CFLAGS += $(KCFLAGS) 1116KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1117 1118KBUILD_LDFLAGS_MODULE += --build-id=sha1 1119LDFLAGS_vmlinux += --build-id=sha1 1120 1121KBUILD_LDFLAGS += -z noexecstack 1122ifeq ($(CONFIG_LD_IS_BFD),y) 1123KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1124endif 1125 1126ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1127LDFLAGS_vmlinux += -X 1128endif 1129 1130ifeq ($(CONFIG_RELR),y) 1131LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1132endif 1133 1134# We never want expected sections to be placed heuristically by the 1135# linker. All sections should be explicitly named in the linker script. 1136ifdef CONFIG_LD_ORPHAN_WARN 1137LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1138endif 1139 1140# Align the bit size of userspace programs with the kernel 1141KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1142KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1143 1144# make the checker run with the right architecture 1145CHECKFLAGS += --arch=$(ARCH) 1146 1147# insure the checker run with the right endianness 1148CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1149 1150# the checker needs the correct machine size 1151CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1152 1153# Default kernel image to build when no specific target is given. 1154# KBUILD_IMAGE may be overruled on the command line or 1155# set in the environment 1156# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1157# this default value 1158export KBUILD_IMAGE ?= vmlinux 1159 1160# 1161# INSTALL_PATH specifies where to place the updated kernel and system map 1162# images. Default is /boot, but you can set it to other values 1163export INSTALL_PATH ?= /boot 1164 1165# 1166# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1167# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1168# an argument if needed. Otherwise it defaults to the kernel install path 1169# 1170export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1171 1172# 1173# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1174# relocations required by build roots. This is not defined in the 1175# makefile but the argument can be passed to make if needed. 1176# 1177 1178MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1179export MODLIB 1180 1181PHONY += prepare0 1182 1183export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1184export MODORDER := $(extmod_prefix)modules.order 1185export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1186 1187ifeq ($(KBUILD_EXTMOD),) 1188 1189build-dir := . 1190clean-dirs := $(sort . Documentation \ 1191 $(patsubst %/,%,$(filter %/, $(core-) \ 1192 $(drivers-) $(libs-)))) 1193 1194export ARCH_CORE := $(core-y) 1195export ARCH_LIB := $(filter %/, $(libs-y)) 1196export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1197# Externally visible symbols (used by link-vmlinux.sh) 1198 1199KBUILD_VMLINUX_OBJS := ./built-in.a 1200ifdef CONFIG_MODULES 1201KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1202KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1203else 1204KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1205endif 1206 1207export KBUILD_VMLINUX_LIBS 1208export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1209 1210# Recurse until adjust_autoksyms.sh is satisfied 1211PHONY += autoksyms_recursive 1212ifdef CONFIG_TRIM_UNUSED_KSYMS 1213# For the kernel to actually contain only the needed exported symbols, 1214# we have to build modules as well to determine what those symbols are. 1215# (this can be evaluated only once include/config/auto.conf has been included) 1216KBUILD_MODULES := 1 1217 1218autoksyms_recursive: $(build-dir) modules.order 1219 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1220 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1221endif 1222 1223autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1224 1225quiet_cmd_autoksyms_h = GEN $@ 1226 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1227 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1228 1229$(autoksyms_h): 1230 $(call cmd,autoksyms_h) 1231 1232# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1233quiet_cmd_ar_vmlinux.a = AR $@ 1234 cmd_ar_vmlinux.a = \ 1235 rm -f $@; \ 1236 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1237 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1238 1239targets += vmlinux.a 1240vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1241 $(call if_changed,ar_vmlinux.a) 1242 1243PHONY += vmlinux_o 1244vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1245 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1246 1247vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1248 @: 1249 1250PHONY += vmlinux 1251# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1252# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1253# unrelated; the decompressors just happen to have the same base name, 1254# arch/*/boot/compressed/vmlinux. 1255# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1256# 1257# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1258# https://savannah.gnu.org/bugs/?61463 1259# For Make > 4.4, the following simple code will work: 1260# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1261vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1262vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1263vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1264 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1265 1266# The actual objects are generated when descending, 1267# make sure no implicit rule kicks in 1268$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1269 1270filechk_kernel.release = \ 1271 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1272 1273# Store (new) KERNELRELEASE string in include/config/kernel.release 1274include/config/kernel.release: FORCE 1275 $(call filechk,kernel.release) 1276 1277# Additional helpers built in scripts/ 1278# Carefully list dependencies so we do not try to build scripts twice 1279# in parallel 1280PHONY += scripts 1281scripts: scripts_basic scripts_dtc 1282 $(Q)$(MAKE) $(build)=$(@) 1283 1284# Things we need to do before we recursively start building the kernel 1285# or the modules are listed in "prepare". 1286# A multi level approach is used. prepareN is processed before prepareN-1. 1287# archprepare is used in arch Makefiles and when processed asm symlink, 1288# version.h and scripts_basic is processed / created. 1289 1290PHONY += prepare archprepare 1291 1292archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1293 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1294 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1295 1296prepare0: archprepare 1297 $(Q)$(MAKE) $(build)=scripts/mod 1298 $(Q)$(MAKE) $(build)=. prepare 1299 1300# All the preparing.. 1301prepare: prepare0 1302ifdef CONFIG_RUST 1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1304 $(Q)$(MAKE) $(build)=rust 1305endif 1306 1307PHONY += remove-stale-files 1308remove-stale-files: 1309 $(Q)$(srctree)/scripts/remove-stale-files 1310 1311# Support for using generic headers in asm-generic 1312asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1313 1314PHONY += asm-generic uapi-asm-generic 1315asm-generic: uapi-asm-generic 1316 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1317 generic=include/asm-generic 1318uapi-asm-generic: 1319 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1320 generic=include/uapi/asm-generic 1321 1322# Generate some files 1323# --------------------------------------------------------------------------- 1324 1325# KERNELRELEASE can change from a few different places, meaning version.h 1326# needs to be updated, so this check is forced on all builds 1327 1328uts_len := 64 1329define filechk_utsrelease.h 1330 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1331 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1332 exit 1; \ 1333 fi; \ 1334 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1335endef 1336 1337define filechk_version.h 1338 if [ $(SUBLEVEL) -gt 255 ]; then \ 1339 echo \#define LINUX_VERSION_CODE $(shell \ 1340 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1341 else \ 1342 echo \#define LINUX_VERSION_CODE $(shell \ 1343 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1344 fi; \ 1345 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1346 ((c) > 255 ? 255 : (c)))'; \ 1347 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1348 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1349 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1350endef 1351 1352$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1353$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1354$(version_h): FORCE 1355 $(call filechk,version.h) 1356 1357include/generated/utsrelease.h: include/config/kernel.release FORCE 1358 $(call filechk,utsrelease.h) 1359 1360filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1361 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1362 1363include/generated/compile.h: FORCE 1364 $(call filechk,compile.h) 1365 1366PHONY += headerdep 1367headerdep: 1368 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1369 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1370 1371# --------------------------------------------------------------------------- 1372# Kernel headers 1373 1374#Default location for installed headers 1375export INSTALL_HDR_PATH = $(objtree)/usr 1376 1377quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1378 cmd_headers_install = \ 1379 mkdir -p $(INSTALL_HDR_PATH); \ 1380 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1381 usr/include $(INSTALL_HDR_PATH) 1382 1383PHONY += headers_install 1384headers_install: headers 1385 $(call cmd,headers_install) 1386 1387PHONY += archheaders archscripts 1388 1389hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1390 1391PHONY += headers 1392headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1393 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1394 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1395 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1396 1397ifdef CONFIG_HEADERS_INSTALL 1398prepare: headers 1399endif 1400 1401PHONY += scripts_unifdef 1402scripts_unifdef: scripts_basic 1403 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1404 1405# --------------------------------------------------------------------------- 1406# Install 1407 1408# Many distributions have the custom install script, /sbin/installkernel. 1409# If DKMS is installed, 'make install' will eventually recurse back 1410# to this Makefile to build and install external modules. 1411# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1412 1413quiet_cmd_install = INSTALL $(INSTALL_PATH) 1414 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1415 1416# --------------------------------------------------------------------------- 1417# Tools 1418 1419ifdef CONFIG_OBJTOOL 1420prepare: tools/objtool 1421endif 1422 1423ifdef CONFIG_BPF 1424ifdef CONFIG_DEBUG_INFO_BTF 1425prepare: tools/bpf/resolve_btfids 1426endif 1427endif 1428 1429PHONY += resolve_btfids_clean 1430 1431resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1432 1433# tools/bpf/resolve_btfids directory might not exist 1434# in output directory, skip its clean in that case 1435resolve_btfids_clean: 1436ifneq ($(wildcard $(resolve_btfids_O)),) 1437 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1438endif 1439 1440# Clear a bunch of variables before executing the submake 1441ifeq ($(quiet),silent_) 1442tools_silent=s 1443endif 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 1449tools/%: FORCE 1450 $(Q)mkdir -p $(objtree)/tools 1451 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1452 1453# --------------------------------------------------------------------------- 1454# Kernel selftest 1455 1456PHONY += kselftest 1457kselftest: headers 1458 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1459 1460kselftest-%: headers FORCE 1461 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1462 1463PHONY += kselftest-merge 1464kselftest-merge: 1465 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1466 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1467 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1468 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1469 1470# --------------------------------------------------------------------------- 1471# Devicetree files 1472 1473ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1474dtstree := arch/$(SRCARCH)/boot/dts 1475endif 1476 1477ifneq ($(dtstree),) 1478 1479%.dtb: dtbs_prepare 1480 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1481 1482%.dtbo: dtbs_prepare 1483 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1484 1485PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1486dtbs: dtbs_prepare 1487 $(Q)$(MAKE) $(build)=$(dtstree) 1488 1489# include/config/kernel.release is actually needed when installing DTBs because 1490# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1491# dtbs_install depend on it as dtbs_install may run as root. 1492dtbs_prepare: include/config/kernel.release scripts_dtc 1493 1494ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1495export CHECK_DTBS=y 1496dtbs: dt_binding_check 1497endif 1498 1499dtbs_check: dtbs 1500 1501dtbs_install: 1502 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1503 1504ifdef CONFIG_OF_EARLY_FLATTREE 1505all: dtbs 1506endif 1507 1508endif 1509 1510PHONY += scripts_dtc 1511scripts_dtc: scripts_basic 1512 $(Q)$(MAKE) $(build)=scripts/dtc 1513 1514ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1515export CHECK_DT_BINDING=y 1516endif 1517 1518PHONY += dt_binding_check 1519dt_binding_check: scripts_dtc 1520 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1521 1522PHONY += dt_compatible_check 1523dt_compatible_check: dt_binding_check 1524 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1525 1526# --------------------------------------------------------------------------- 1527# Modules 1528 1529ifdef CONFIG_MODULES 1530 1531# By default, build modules as well 1532 1533all: modules 1534 1535# When we're building modules with modversions, we need to consider 1536# the built-in objects during the descend as well, in order to 1537# make sure the checksums are up to date before we record them. 1538ifdef CONFIG_MODVERSIONS 1539 KBUILD_BUILTIN := 1 1540endif 1541 1542# Build modules 1543# 1544 1545# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES 1546# is an exception. 1547ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1548KBUILD_BUILTIN := 1 1549modules: vmlinux 1550endif 1551 1552modules: modules_prepare 1553 1554# Target to prepare building external modules 1555modules_prepare: prepare 1556 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1557 1558export modules_sign_only := 1559 1560ifeq ($(CONFIG_MODULE_SIG),y) 1561PHONY += modules_sign 1562modules_sign: modules_install 1563 @: 1564 1565# modules_sign is a subset of modules_install. 1566# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1567ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1568modules_sign_only := y 1569endif 1570endif 1571 1572modinst_pre := 1573ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1574modinst_pre := __modinst_pre 1575endif 1576 1577modules_install: $(modinst_pre) 1578PHONY += __modinst_pre 1579__modinst_pre: 1580 @rm -rf $(MODLIB)/kernel 1581 @rm -f $(MODLIB)/source 1582 @mkdir -p $(MODLIB)/kernel 1583 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1584 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1585 rm -f $(MODLIB)/build ; \ 1586 ln -s $(CURDIR) $(MODLIB)/build ; \ 1587 fi 1588 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1589 @cp -f modules.builtin $(MODLIB)/ 1590 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1591 1592endif # CONFIG_MODULES 1593 1594### 1595# Cleaning is done on three levels. 1596# make clean Delete most generated files 1597# Leave enough to build external modules 1598# make mrproper Delete the current configuration, and all generated files 1599# make distclean Remove editor backup files, patch leftover files and the like 1600 1601# Directories & files removed with 'make clean' 1602CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1603 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1604 compile_commands.json .thinlto-cache rust/test rust/doc \ 1605 .vmlinux.objs .vmlinux.export.c 1606 1607# Directories & files removed with 'make mrproper' 1608MRPROPER_FILES += include/config include/generated \ 1609 arch/$(SRCARCH)/include/generated .objdiff \ 1610 debian snap tar-install \ 1611 .config .config.old .version \ 1612 Module.symvers \ 1613 certs/signing_key.pem \ 1614 certs/x509.genkey \ 1615 vmlinux-gdb.py \ 1616 *.spec \ 1617 rust/target.json rust/libmacros.so 1618 1619# clean - Delete most, but leave enough to build external modules 1620# 1621clean: rm-files := $(CLEAN_FILES) 1622 1623PHONY += archclean vmlinuxclean 1624 1625vmlinuxclean: 1626 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1627 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1628 1629clean: archclean vmlinuxclean resolve_btfids_clean 1630 1631# mrproper - Delete all generated files, including .config 1632# 1633mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1634mrproper-dirs := $(addprefix _mrproper_,scripts) 1635 1636PHONY += $(mrproper-dirs) mrproper 1637$(mrproper-dirs): 1638 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1639 1640mrproper: clean $(mrproper-dirs) 1641 $(call cmd,rmfiles) 1642 @find . $(RCS_FIND_IGNORE) \ 1643 \( -name '*.rmeta' \) \ 1644 -type f -print | xargs rm -f 1645 1646# distclean 1647# 1648PHONY += distclean 1649 1650distclean: mrproper 1651 @find . $(RCS_FIND_IGNORE) \ 1652 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1653 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1654 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1655 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1656 -type f -print | xargs rm -f 1657 1658 1659# Packaging of the kernel to various formats 1660# --------------------------------------------------------------------------- 1661 1662%src-pkg: FORCE 1663 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1664%pkg: include/config/kernel.release FORCE 1665 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1666 1667# Brief documentation of the typical targets used 1668# --------------------------------------------------------------------------- 1669 1670boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1671boards := $(sort $(notdir $(boards))) 1672board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1673board-dirs := $(sort $(notdir $(board-dirs:/=))) 1674 1675PHONY += help 1676help: 1677 @echo 'Cleaning targets:' 1678 @echo ' clean - Remove most generated files but keep the config and' 1679 @echo ' enough build support to build external modules' 1680 @echo ' mrproper - Remove all generated files + config + various backup files' 1681 @echo ' distclean - mrproper + remove editor backup and patch files' 1682 @echo '' 1683 @echo 'Configuration targets:' 1684 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1685 @echo '' 1686 @echo 'Other generic targets:' 1687 @echo ' all - Build all targets marked with [*]' 1688 @echo '* vmlinux - Build the bare kernel' 1689 @echo '* modules - Build all modules' 1690 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1691 @echo ' dir/ - Build all files in dir and below' 1692 @echo ' dir/file.[ois] - Build specified target only' 1693 @echo ' dir/file.ll - Build the LLVM assembly file' 1694 @echo ' (requires compiler support for LLVM assembly generation)' 1695 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1696 @echo ' (requires a recent binutils and recent build (System.map))' 1697 @echo ' dir/file.ko - Build module including final link' 1698 @echo ' modules_prepare - Set up for building external modules' 1699 @echo ' tags/TAGS - Generate tags file for editors' 1700 @echo ' cscope - Generate cscope index' 1701 @echo ' gtags - Generate GNU GLOBAL index' 1702 @echo ' kernelrelease - Output the release version string (use with make -s)' 1703 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1704 @echo ' image_name - Output the image name (use with make -s)' 1705 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1706 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1707 echo '' 1708 @echo 'Static analysers:' 1709 @echo ' checkstack - Generate a list of stack hogs' 1710 @echo ' versioncheck - Sanity check on version.h usage' 1711 @echo ' includecheck - Check for duplicate included header files' 1712 @echo ' export_report - List the usages of all exported symbols' 1713 @echo ' headerdep - Detect inclusion cycles in headers' 1714 @echo ' coccicheck - Check with Coccinelle' 1715 @echo ' clang-analyzer - Check with clang static analyzer' 1716 @echo ' clang-tidy - Check with clang-tidy' 1717 @echo '' 1718 @echo 'Tools:' 1719 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1720 @echo '' 1721 @echo 'Kernel selftest:' 1722 @echo ' kselftest - Build and run kernel selftest' 1723 @echo ' Build, install, and boot kernel before' 1724 @echo ' running kselftest on it' 1725 @echo ' Run as root for full coverage' 1726 @echo ' kselftest-all - Build kernel selftest' 1727 @echo ' kselftest-install - Build and install kernel selftest' 1728 @echo ' kselftest-clean - Remove all generated kselftest files' 1729 @echo ' kselftest-merge - Merge all the config dependencies of' 1730 @echo ' kselftest to existing .config.' 1731 @echo '' 1732 @echo 'Rust targets:' 1733 @echo ' rustavailable - Checks whether the Rust toolchain is' 1734 @echo ' available and, if not, explains why.' 1735 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1736 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1737 @echo ' is formatted, printing a diff otherwise.' 1738 @echo ' rustdoc - Generate Rust documentation' 1739 @echo ' (requires kernel .config)' 1740 @echo ' rusttest - Runs the Rust tests' 1741 @echo ' (requires kernel .config; downloads external repos)' 1742 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1743 @echo ' (requires kernel .config)' 1744 @echo ' dir/file.[os] - Build specified target only' 1745 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1746 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1747 @echo ' The output is not intended to be compilable.' 1748 @echo ' dir/file.ll - Build the LLVM assembly file' 1749 @echo '' 1750 @$(if $(dtstree), \ 1751 echo 'Devicetree:'; \ 1752 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1753 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1754 echo ' dt_binding_check - Validate device tree binding documents'; \ 1755 echo ' dtbs_check - Validate device tree source files';\ 1756 echo '') 1757 1758 @echo 'Userspace tools targets:' 1759 @echo ' use "make tools/help"' 1760 @echo ' or "cd tools; make help"' 1761 @echo '' 1762 @echo 'Kernel packaging:' 1763 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1764 @echo '' 1765 @echo 'Documentation targets:' 1766 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1767 @echo '' 1768 @echo 'Architecture specific targets ($(SRCARCH)):' 1769 @$(or $(archhelp),\ 1770 echo ' No architecture specific help defined for $(SRCARCH)') 1771 @echo '' 1772 @$(if $(boards), \ 1773 $(foreach b, $(boards), \ 1774 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1775 echo '') 1776 @$(if $(board-dirs), \ 1777 $(foreach b, $(board-dirs), \ 1778 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1779 printf " %-16s - Show all of the above\\n" help-boards; \ 1780 echo '') 1781 1782 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1783 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1784 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1785 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1786 @echo ' (sparse by default)' 1787 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1788 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1789 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1790 @echo ' 1: warnings which may be relevant and do not occur too often' 1791 @echo ' 2: warnings which occur quite often but may still be relevant' 1792 @echo ' 3: more obscure warnings, can most likely be ignored' 1793 @echo ' e: warnings are being treated as errors' 1794 @echo ' Multiple levels can be combined with W=12 or W=123' 1795 @echo '' 1796 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1797 @echo 'For further info see the ./README file' 1798 1799 1800help-board-dirs := $(addprefix help-,$(board-dirs)) 1801 1802help-boards: $(help-board-dirs) 1803 1804boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1805 1806$(help-board-dirs): help-%: 1807 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1808 @$(if $(boards-per-dir), \ 1809 $(foreach b, $(boards-per-dir), \ 1810 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1811 echo '') 1812 1813 1814# Documentation targets 1815# --------------------------------------------------------------------------- 1816DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1817 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1818PHONY += $(DOC_TARGETS) 1819$(DOC_TARGETS): 1820 $(Q)$(MAKE) $(build)=Documentation $@ 1821 1822 1823# Rust targets 1824# --------------------------------------------------------------------------- 1825 1826# "Is Rust available?" target 1827PHONY += rustavailable 1828rustavailable: 1829 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1830 1831# Documentation target 1832# 1833# Using the singular to avoid running afoul of `no-dot-config-targets`. 1834PHONY += rustdoc 1835rustdoc: prepare 1836 $(Q)$(MAKE) $(build)=rust $@ 1837 1838# Testing target 1839PHONY += rusttest 1840rusttest: prepare 1841 $(Q)$(MAKE) $(build)=rust $@ 1842 1843# Formatting targets 1844PHONY += rustfmt rustfmtcheck 1845 1846# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1847# 1848# We match using absolute paths since `find` does not resolve them 1849# when matching, which is a problem when e.g. `srctree` is `..`. 1850# We `grep` afterwards in order to remove the directory entry itself. 1851rustfmt: 1852 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1853 -o -path $(abs_srctree)/rust/alloc -prune \ 1854 -o -path $(abs_objtree)/rust/test -prune \ 1855 | grep -Fv $(abs_srctree)/rust/alloc \ 1856 | grep -Fv $(abs_objtree)/rust/test \ 1857 | grep -Fv generated \ 1858 | xargs $(RUSTFMT) $(rustfmt_flags) 1859 1860rustfmtcheck: rustfmt_flags = --check 1861rustfmtcheck: rustfmt 1862 1863# IDE support targets 1864PHONY += rust-analyzer 1865rust-analyzer: 1866 $(Q)$(MAKE) $(build)=rust $@ 1867 1868# Misc 1869# --------------------------------------------------------------------------- 1870 1871PHONY += scripts_gdb 1872scripts_gdb: prepare0 1873 $(Q)$(MAKE) $(build)=scripts/gdb 1874 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1875 1876ifdef CONFIG_GDB_SCRIPTS 1877all: scripts_gdb 1878endif 1879 1880else # KBUILD_EXTMOD 1881 1882### 1883# External module support. 1884# When building external modules the kernel used as basis is considered 1885# read-only, and no consistency checks are made and the make 1886# system is not used on the basis kernel. If updates are required 1887# in the basis kernel ordinary make commands (without M=...) must be used. 1888 1889# We are always building only modules. 1890KBUILD_BUILTIN := 1891KBUILD_MODULES := 1 1892 1893build-dir := $(KBUILD_EXTMOD) 1894 1895compile_commands.json: $(extmod_prefix)compile_commands.json 1896PHONY += compile_commands.json 1897 1898clean-dirs := $(KBUILD_EXTMOD) 1899clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1900 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1901 1902PHONY += prepare 1903# now expand this into a simple variable to reduce the cost of shell evaluations 1904prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1905prepare: 1906 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1907 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1908 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1909 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1910 fi 1911 1912PHONY += help 1913help: 1914 @echo ' Building external modules.' 1915 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1916 @echo '' 1917 @echo ' modules - default target, build the module(s)' 1918 @echo ' modules_install - install the module' 1919 @echo ' clean - remove generated files in module directory only' 1920 @echo '' 1921 1922endif # KBUILD_EXTMOD 1923 1924# --------------------------------------------------------------------------- 1925# Modules 1926 1927PHONY += modules modules_install modules_prepare 1928 1929ifdef CONFIG_MODULES 1930 1931$(MODORDER): $(build-dir) 1932 @: 1933 1934# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1935# This is solely useful to speed up test compiles. 1936modules: modpost 1937ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1938 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1939endif 1940 1941PHONY += modules_check 1942modules_check: $(MODORDER) 1943 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1944 1945quiet_cmd_depmod = DEPMOD $(MODLIB) 1946 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1947 $(KERNELRELEASE) 1948 1949modules_install: 1950 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1951 $(call cmd,depmod) 1952 1953else # CONFIG_MODULES 1954 1955# Modules not configured 1956# --------------------------------------------------------------------------- 1957 1958modules modules_install: 1959 @echo >&2 '***' 1960 @echo >&2 '*** The present kernel configuration has modules disabled.' 1961 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1962 @echo >&2 '*** to enable CONFIG_MODULES.' 1963 @echo >&2 '***' 1964 @exit 1 1965 1966KBUILD_MODULES := 1967 1968endif # CONFIG_MODULES 1969 1970PHONY += modpost 1971modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1972 $(if $(KBUILD_MODULES), modules_check) 1973 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1974 1975# Single targets 1976# --------------------------------------------------------------------------- 1977# To build individual files in subdirectories, you can do like this: 1978# 1979# make foo/bar/baz.s 1980# 1981# The supported suffixes for single-target are listed in 'single-targets' 1982# 1983# To build only under specific subdirectories, you can do like this: 1984# 1985# make foo/bar/baz/ 1986 1987ifdef single-build 1988 1989# .ko is special because modpost is needed 1990single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1991single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1992 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1993 1994$(single-ko): single_modules 1995 @: 1996$(single-no-ko): $(build-dir) 1997 @: 1998 1999# Remove MODORDER when done because it is not the real one. 2000PHONY += single_modules 2001single_modules: $(single-no-ko) modules_prepare 2002 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2003 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2004ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2005 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2006endif 2007 $(Q)rm -f $(MODORDER) 2008 2009single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2010 2011KBUILD_MODULES := 1 2012 2013endif 2014 2015# Preset locale variables to speed up the build process. Limit locale 2016# tweaks to this spot to avoid wrong language settings when running 2017# make menuconfig etc. 2018# Error messages still appears in the original language 2019PHONY += $(build-dir) 2020$(build-dir): prepare 2021 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2022 2023clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2024PHONY += $(clean-dirs) clean 2025$(clean-dirs): 2026 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2027 2028clean: $(clean-dirs) 2029 $(call cmd,rmfiles) 2030 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2031 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2032 -o -name '*.ko.*' \ 2033 -o -name '*.dtb' -o -name '*.dtbo' \ 2034 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2035 -o -name '*.dt.yaml' \ 2036 -o -name '*.dwo' -o -name '*.lst' \ 2037 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2038 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2039 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2040 -o -name '*.asn1.[ch]' \ 2041 -o -name '*.symtypes' -o -name 'modules.order' \ 2042 -o -name '.tmp_*' \ 2043 -o -name '*.c.[012]*.*' \ 2044 -o -name '*.ll' \ 2045 -o -name '*.gcno' \ 2046 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 2047 2048# Generate tags for editors 2049# --------------------------------------------------------------------------- 2050quiet_cmd_tags = GEN $@ 2051 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2052 2053tags TAGS cscope gtags: FORCE 2054 $(call cmd,tags) 2055 2056# Script to generate missing namespace dependencies 2057# --------------------------------------------------------------------------- 2058 2059PHONY += nsdeps 2060nsdeps: export KBUILD_NSDEPS=1 2061nsdeps: modules 2062 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2063 2064# Clang Tooling 2065# --------------------------------------------------------------------------- 2066 2067quiet_cmd_gen_compile_commands = GEN $@ 2068 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2069 2070$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2071 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2072 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2073 $(call if_changed,gen_compile_commands) 2074 2075targets += $(extmod_prefix)compile_commands.json 2076 2077PHONY += clang-tidy clang-analyzer 2078 2079ifdef CONFIG_CC_IS_CLANG 2080quiet_cmd_clang_tools = CHECK $< 2081 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2082 2083clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2084 $(call cmd,clang_tools) 2085else 2086clang-tidy clang-analyzer: 2087 @echo "$@ requires CC=clang" >&2 2088 @false 2089endif 2090 2091# Scripts to check various things for consistency 2092# --------------------------------------------------------------------------- 2093 2094PHONY += includecheck versioncheck coccicheck export_report 2095 2096includecheck: 2097 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2098 -name '*.[hcS]' -type f -print | sort \ 2099 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2100 2101versioncheck: 2102 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2103 -name '*.[hcS]' -type f -print | sort \ 2104 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2105 2106coccicheck: 2107 $(Q)$(BASH) $(srctree)/scripts/$@ 2108 2109export_report: 2110 $(PERL) $(srctree)/scripts/export_report.pl 2111 2112PHONY += checkstack kernelrelease kernelversion image_name 2113 2114# UML needs a little special treatment here. It wants to use the host 2115# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2116# else wants $(ARCH), including people doing cross-builds, which means 2117# that $(SUBARCH) doesn't work here. 2118ifeq ($(ARCH), um) 2119CHECKSTACK_ARCH := $(SUBARCH) 2120else 2121CHECKSTACK_ARCH := $(ARCH) 2122endif 2123checkstack: 2124 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2125 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2126 2127kernelrelease: 2128 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 2129 2130kernelversion: 2131 @echo $(KERNELVERSION) 2132 2133image_name: 2134 @echo $(KBUILD_IMAGE) 2135 2136quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2137 cmd_rmfiles = rm -rf $(rm-files) 2138 2139# read saved command lines for existing targets 2140existing-targets := $(wildcard $(sort $(targets))) 2141 2142-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2143 2144endif # config-build 2145endif # mixed-build 2146endif # need-sub-make 2147 2148PHONY += FORCE 2149FORCE: 2150 2151# Declare the contents of the PHONY variable as phony. We keep that 2152# information in a variable so we can use it in if_changed and friends. 2153.PHONY: $(PHONY) 2154