1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Baby Opossum Posse 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 ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 kconfig-sym-check \ 297 $(version_h) headers headers_% archheaders archscripts \ 298 %asm-generic kernelversion %src-pkg dt_binding_check \ 299 dt_style_selftest \ 300 outputmakefile rustavailable rustfmt rustfmtcheck \ 301 scripts_gen_init_cpio \ 302 run-command 303no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 304 image_name 305single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.header-check %/ 306 307config-build := 308mixed-build := 309need-config := 1 310may-sync-config := 1 311single-build := 312 313ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 314 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 315 need-config := 316 endif 317endif 318 319ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 320 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 321 may-sync-config := 322 endif 323endif 324 325need-compiler := $(may-sync-config) 326 327ifneq ($(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, $(objtree)/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=arm64 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=aarch64-linux-gnu- 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 := $(LLVM) 454else ifneq ($(LLVM),1) 455$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 456endif 457 458HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 459HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 460else 461HOSTCC = gcc 462HOSTCXX = g++ 463endif 464HOSTRUSTC = rustc 465HOSTPKG_CONFIG = pkg-config 466 467# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 468# has a logic to call it 469KERNELDOC = $(srctree)/tools/docs/kernel-doc 470export KERNELDOC 471 472KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 473 -O2 -fomit-frame-pointer -std=gnu11 474KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 475KBUILD_USERLDFLAGS := $(USERLDFLAGS) 476 477# These flags apply to all Rust code in the tree, including the kernel and 478# host programs. 479# 480# `-Aclippy::comparison_chain`: the lint has been demoted since 1.87. 481# `-Aclippy::unwrap_or_default`: the lint is buggy [1] and ignores our 482# MSRV. It can trigger depending on the optimization level. 483# [1] https://github.com/rust-lang/rust-clippy/issues/17379 484export rust_common_flags := --edition=2021 \ 485 -Zbinary_dep_depinfo=y \ 486 -Astable_features \ 487 -Aunused_features \ 488 -Dnon_ascii_idents \ 489 -Dunsafe_op_in_unsafe_fn \ 490 -Wmissing_docs \ 491 -Wrust_2018_idioms \ 492 -Wunreachable_pub \ 493 -Wclippy::all \ 494 -Wclippy::as_ptr_cast_mut \ 495 -Wclippy::as_underscore \ 496 -Wclippy::cast_lossless \ 497 -Aclippy::collapsible_if \ 498 -Aclippy::collapsible_match \ 499 -Aclippy::comparison_chain \ 500 -Wclippy::ignored_unit_patterns \ 501 -Aclippy::incompatible_msrv \ 502 -Wclippy::mut_mut \ 503 -Wclippy::needless_bitwise_bool \ 504 -Aclippy::needless_lifetimes \ 505 -Wclippy::no_mangle_with_rust_abi \ 506 -Wclippy::ptr_as_ptr \ 507 -Wclippy::ptr_cast_constness \ 508 -Wclippy::ref_as_ptr \ 509 -Wclippy::undocumented_unsafe_blocks \ 510 -Aclippy::uninlined_format_args \ 511 -Wclippy::unnecessary_safety_comment \ 512 -Wclippy::unnecessary_safety_doc \ 513 -Aclippy::unwrap_or_default \ 514 -Wrustdoc::missing_crate_level_docs \ 515 -Wrustdoc::unescaped_backticks 516 517KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 518 $(HOSTCFLAGS) -I $(srctree)/scripts/include 519KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 520 -I $(srctree)/scripts/include 521KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 522 -Zallow-features= 523KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 524KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 525KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 526 527# Make variables (CC, etc...) 528CPP = $(CC) -E 529ifneq ($(LLVM),) 530CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 531LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 532AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 533LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 534NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 535OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 536OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 537READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 538STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 539ifeq ($(filter -fuse-ld=% --ld-path=%,$(KBUILD_HOSTLDFLAGS)),) 540KBUILD_HOSTLDFLAGS += -fuse-ld=lld 541endif 542else 543CC = $(CROSS_COMPILE)gcc 544LD = $(CROSS_COMPILE)ld 545AR = $(CROSS_COMPILE)ar 546NM = $(CROSS_COMPILE)nm 547OBJCOPY = $(CROSS_COMPILE)objcopy 548OBJDUMP = $(CROSS_COMPILE)objdump 549READELF = $(CROSS_COMPILE)readelf 550STRIP = $(CROSS_COMPILE)strip 551endif 552RUSTC = rustc 553RUSTDOC = rustdoc 554RUSTFMT = rustfmt 555CLIPPY_DRIVER = clippy-driver 556BINDGEN = bindgen 557PAHOLE = pahole 558RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 559LEX = flex 560YACC = bison 561AWK = awk 562INSTALLKERNEL := installkernel 563PERL = perl 564PYTHON3 = python3 565CHECK = sparse 566BASH = bash 567KGZIP = gzip 568KBZIP2 = bzip2 569KLZOP = lzop 570LZMA = lzma 571LZ4 = lz4 572XZ = xz 573ZSTD = zstd 574# The kernel image is compressed with pigz, on the job slots make has free, 575# if it is installed. Everything else uses KGZIP. 576KPGZIP := $(if $(shell command -v pigz 2>/dev/null),$(PYTHON3) $(abs_srctree)/scripts/jobserver-exec pigz -p %PARALLELISM%,$(KGZIP)) 577TAR = tar 578 579CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 580 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 581NOSTDINC_FLAGS := 582CFLAGS_MODULE = 583RUSTFLAGS_MODULE = 584AFLAGS_MODULE = 585LDFLAGS_MODULE = 586CFLAGS_KERNEL = 587RUSTFLAGS_KERNEL = 588AFLAGS_KERNEL = 589LDFLAGS_vmlinux = 590 591# Use USERINCLUDE when you must reference the UAPI directories only. 592USERINCLUDE := \ 593 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 594 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 595 -I$(srctree)/include/uapi \ 596 -I$(objtree)/include/generated/uapi \ 597 -include $(srctree)/include/linux/compiler-version.h \ 598 -include $(srctree)/include/linux/kconfig.h 599 600# Use LINUXINCLUDE when you must reference the include/ directory. 601# Needed to be compatible with the O= option 602LINUXINCLUDE := \ 603 -I$(srctree)/arch/$(SRCARCH)/include \ 604 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 605 -I$(srctree)/include \ 606 -I$(objtree)/include \ 607 $(USERINCLUDE) 608 609KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 610 611KBUILD_CFLAGS := 612KBUILD_CFLAGS += -fshort-wchar 613KBUILD_CFLAGS += -funsigned-char 614KBUILD_CFLAGS += -fno-common 615KBUILD_CFLAGS += -fno-PIE 616KBUILD_CFLAGS += -fno-strict-aliasing 617 618KBUILD_CPPFLAGS := -D__KERNEL__ 619KBUILD_RUSTFLAGS := $(rust_common_flags) \ 620 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 621 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 622 -Csymbol-mangling-version=v0 \ 623 -Crelocation-model=static \ 624 -Zfunction-sections=n \ 625 -Wclippy::float_arithmetic 626KBUILD_RUSTFLAGS_OPTION_CHKS := 627 628KBUILD_AFLAGS_KERNEL := 629KBUILD_CFLAGS_KERNEL := 630KBUILD_RUSTFLAGS_KERNEL := 631KBUILD_AFLAGS_MODULE := -DMODULE 632KBUILD_CFLAGS_MODULE := -DMODULE 633KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 634KBUILD_LDFLAGS_MODULE := 635KBUILD_LDFLAGS := 636CLANG_FLAGS := 637 638ifeq ($(KBUILD_CLIPPY),1) 639 RUSTC_OR_CLIPPY_QUIET := CLIPPY 640 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 641else 642 RUSTC_OR_CLIPPY_QUIET := RUSTC 643 RUSTC_OR_CLIPPY = $(RUSTC) 644endif 645 646# Allows the usage of unstable features in stable compilers. 647export RUSTC_BOOTSTRAP := 1 648 649# Allows finding `.clippy.toml` in out-of-srctree builds. 650export CLIPPY_CONF_DIR := $(srctree) 651 652export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 653export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 654export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 655export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 656export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 657export KGZIP KPGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 658export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 659export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 660 661export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 662export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 663export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 664export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 665export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 666export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 667 668# Files to ignore in find ... statements 669 670export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 671 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 672 -prune -o 673 674# =========================================================================== 675# Rules shared between *config targets and build targets 676 677# Basic helpers built in scripts/basic/ 678PHONY += scripts_basic 679scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 680scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 681scripts_basic: 682 $(Q)$(MAKE) $(build)=scripts/basic 683 684PHONY += outputmakefile 685ifdef building_out_of_srctree 686# Before starting out-of-tree build, make sure the source tree is clean. 687# outputmakefile generates a Makefile in the output directory, if using a 688# separate output directory. This allows convenient use of make in the 689# output directory. 690# At the same time as the output Makefile is generated, generate .gitignore to 691# ignore the whole output directory 692 693ifdef KBUILD_EXTMOD 694print_env_for_makefile = \ 695 echo "export KBUILD_OUTPUT = $(objtree)"; \ 696 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 697 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 698else 699print_env_for_makefile = \ 700 echo "export KBUILD_OUTPUT = $(CURDIR)" 701endif 702 703filechk_makefile = { \ 704 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 705 $(print_env_for_makefile); \ 706 echo "include $(abs_srctree)/Makefile"; \ 707 } 708 709PHONY += $(CURDIR)/Makefile 710$(CURDIR)/Makefile: FORCE 711 $(call filechk,makefile) 712 713outputmakefile: $(CURDIR)/Makefile 714ifeq ($(KBUILD_EXTMOD),) 715 @if [ -f $(srctree)/.config -o \ 716 -d $(srctree)/include/config -o \ 717 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 718 echo >&2 "***"; \ 719 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 720 echo >&2 "*** in $(abs_srctree)";\ 721 echo >&2 "***"; \ 722 false; \ 723 fi 724else 725 @if [ -f $(srcroot)/modules.order ]; then \ 726 echo >&2 "***"; \ 727 echo >&2 "*** The external module source tree is not clean."; \ 728 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 729 echo >&2 "***"; \ 730 false; \ 731 fi 732endif 733 $(Q)ln -fsn $(srcroot) source 734 $(Q)test -e .gitignore || \ 735 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 736endif 737 738# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 739# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 740# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 741# Kconfig (so they need export), and from include/config/auto.conf.cmd to 742# detect the version changes between builds. 743CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 744RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 745PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 746 747ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 748include $(srctree)/scripts/Makefile.clang 749endif 750 751# Include this also for config targets because some architectures need 752# cc-cross-prefix to determine CROSS_COMPILE. 753ifdef need-compiler 754include $(srctree)/scripts/Makefile.compiler 755endif 756 757ifdef config-build 758# =========================================================================== 759# *config targets only - make sure prerequisites are updated, and descend 760# in scripts/kconfig to make the *config target 761 762# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 763# KBUILD_DEFCONFIG may point out an alternative default configuration 764# used for 'make defconfig' 765include $(srctree)/arch/$(SRCARCH)/Makefile 766export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 767 768config: outputmakefile scripts_basic FORCE 769 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 770 771%config: outputmakefile scripts_basic FORCE 772 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 773 774else #!config-build 775# =========================================================================== 776# Build targets only - this includes vmlinux, arch-specific targets, clean 777# targets and others. In general all targets except *config targets. 778 779# If building an external module we do not care about the all: rule 780# but instead __all depend on modules 781PHONY += all 782ifeq ($(KBUILD_EXTMOD),) 783__all: all 784else 785__all: modules 786endif 787 788targets := 789 790# Decide whether to build built-in, modular, or both. 791# Normally, just do built-in. 792 793KBUILD_MODULES := 794KBUILD_BUILTIN := y 795 796# If we have only "make modules", don't compile built-in objects. 797ifeq ($(MAKECMDGOALS),modules) 798 KBUILD_BUILTIN := 799endif 800 801# If we have "make <whatever> modules", compile modules 802# in addition to whatever we do anyway. 803# Just "make" or "make all" shall build modules as well 804 805ifneq ($(filter all modules nsdeps compile_commands.json clang-% sbom,$(MAKECMDGOALS)),) 806 KBUILD_MODULES := y 807endif 808 809ifeq ($(MAKECMDGOALS),) 810 KBUILD_MODULES := y 811endif 812 813export KBUILD_MODULES KBUILD_BUILTIN 814 815ifdef need-config 816include $(objtree)/include/config/auto.conf 817endif 818 819CC_FLAGS_DIALECT := -std=gnu11 820# Allow including a tagged struct or union anonymously in another struct/union. 821CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 822# Clang enables warnings about GNU and Microsoft extensions by default, disable 823# them because this is expected with the above options. 824ifdef CONFIG_CC_IS_CLANG 825CC_FLAGS_DIALECT += -Wno-gnu 826CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 827endif 828export CC_FLAGS_DIALECT 829KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 830 831ifeq ($(KBUILD_EXTMOD),) 832# Objects we will link into vmlinux / subdirs we need to visit 833core-y := 834drivers-y := 835libs-y := lib/ 836endif # KBUILD_EXTMOD 837 838# The all: target is the default when no target is given on the 839# command line. 840# This allow a user to issue only 'make' to build a kernel including modules 841# Defaults to vmlinux, but the arch makefile usually adds further targets 842all: vmlinux 843 844# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 845ifdef CONFIG_FUNCTION_TRACER 846 CC_FLAGS_FTRACE := -pg 847endif 848 849ifdef CONFIG_TRACEPOINTS 850# To check for unused tracepoints (tracepoints that are defined but never 851# called), run with: 852# 853# make UT=1 854# 855# Each unused tracepoints can take up to 5KB of memory in the running kernel. 856# It is best to remove any that are not used. 857# 858# This command line option will be removed when all current unused 859# tracepoints are removed. 860 861ifeq ("$(origin UT)", "command line") 862 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 863endif 864endif # CONFIG_TRACEPOINTS 865 866export WARN_ON_UNUSED_TRACEPOINTS 867 868# Per-version Rust flags. These are like `rust_common_flags`, but may 869# depend on the Rust compiler version (e.g. using `rustc-min-version`). 870# 871# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 872# include bitmasking and shift operations. However, because it generated 873# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 874# lint which is not enabled by default. 875rust_common_flags_per_version := \ 876 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 877 878rust_common_flags += $(rust_common_flags_per_version) 879KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 880KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 881 882include $(srctree)/arch/$(SRCARCH)/Makefile 883 884ifdef need-config 885ifdef may-sync-config 886# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 887# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 888# because some architectures define CROSS_COMPILE there. 889include include/config/auto.conf.cmd 890 891$(KCONFIG_CONFIG): 892 @echo >&2 '***' 893 @echo >&2 '*** Configuration file "$@" not found!' 894 @echo >&2 '***' 895 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 896 @echo >&2 '*** "make menuconfig" or "make xconfig").' 897 @echo >&2 '***' 898 @/bin/false 899 900# The actual configuration files used during the build are stored in 901# include/generated/ and include/config/. Update them if .config is newer than 902# include/config/auto.conf (which mirrors .config). 903# 904# This exploits the 'multi-target pattern rule' trick. 905# The syncconfig should be executed only once to make all the targets. 906# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 907# 908# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 909# so you cannot notice that Kconfig is waiting for the user input. 910%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 911 $(Q)$(kecho) " SYNC $@" 912 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 913else # !may-sync-config 914# External modules and some install targets need include/generated/autoconf.h 915# and include/config/auto.conf but do not care if they are up-to-date. 916# Use auto.conf to show the error message 917 918checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 919missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 920 921ifdef missing-configs 922PHONY += $(objtree)/include/config/auto.conf 923 924$(objtree)/include/config/auto.conf: 925 @echo >&2 '***' 926 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 927 @printf >&2 '*** - %s\n' $(missing-configs) 928 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 929 @echo >&2 '***' 930 @/bin/false 931endif 932 933endif # may-sync-config 934endif # need-config 935 936KBUILD_CFLAGS += -fno-delete-null-pointer-checks 937 938ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 939KBUILD_CFLAGS += -O2 940KBUILD_RUSTFLAGS += -Copt-level=2 941else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 942KBUILD_CFLAGS += -Os 943KBUILD_RUSTFLAGS += -Copt-level=s 944endif 945 946# Always set `debug-assertions` and `overflow-checks` because their default 947# depends on `opt-level` and `debug-assertions`, respectively. 948KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 949KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 950 951# Tell gcc to never replace conditional load with a non-conditional one 952ifdef CONFIG_CC_IS_GCC 953# gcc-10 renamed --param=allow-store-data-races=0 to 954# -fno-allow-store-data-races. 955KBUILD_CFLAGS += $(CONFIG_CC_OPT_ALLOW_STORE_DATA_RACES_PARAM) 956KBUILD_CFLAGS += $(CONFIG_CC_OPT_NO_ALLOW_STORE_DATA_RACES) 957endif 958 959ifdef CONFIG_READABLE_ASM 960# Disable optimizations that make assembler listings hard to read. 961# reorder blocks reorders the control in the function 962# ipa clone creates specialized cloned functions 963# partial inlining inlines only parts of functions 964KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 965endif 966 967stackp-flags-y := -fno-stack-protector 968stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 969stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 970 971KBUILD_CFLAGS += $(stackp-flags-y) 972 973ifdef CONFIG_FRAME_POINTER 974KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 975KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 976# Work around rustc bug on compilers without 977# https://github.com/rust-lang/rust/pull/156980. 978KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=frame-pointer:u32:2:max) 979else 980# Some targets (ARM with Thumb2, for example), can't be built with frame 981# pointers. For those, we don't have FUNCTION_TRACER automatically 982# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 983# incompatible with -fomit-frame-pointer with current GCC, so we don't use 984# -fomit-frame-pointer with FUNCTION_TRACER. 985# In the Rust target specification, "frame-pointer" is set explicitly 986# to "may-omit". 987ifndef CONFIG_FUNCTION_TRACER 988KBUILD_CFLAGS += -fomit-frame-pointer 989endif 990endif 991 992# Initialize all stack variables with a 0xAA pattern. 993ifdef CONFIG_INIT_STACK_ALL_PATTERN 994KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 995endif 996 997# Initialize all stack variables with a zero value. 998ifdef CONFIG_INIT_STACK_ALL_ZERO 999KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 1000ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 1001# https://github.com/llvm/llvm-project/issues/44842 1002CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 1003export CC_AUTO_VAR_INIT_ZERO_ENABLER 1004KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 1005endif 1006endif 1007 1008ifdef CONFIG_KMALLOC_PARTITION_TYPED 1009# KMALLOC_PARTITION_CACHES_NR + 1 1010KBUILD_CFLAGS += -falloc-token-max=16 1011endif 1012 1013ifdef CONFIG_CC_IS_CLANG 1014ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1015KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1016endif 1017endif 1018 1019# Explicitly clear padding bits during variable initialization 1020KBUILD_CFLAGS += $(CONFIG_CC_OPT_ZERO_INIT_PADDING_BITS) 1021 1022# While VLAs have been removed, GCC produces unreachable stack probes 1023# for the randomize_kstack_offset feature. Disable it for all compilers. 1024# Probed here rather than in Kconfig as clang only accepts it for some 1025# sub-targets, so the architecture's flags matter. 1026KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1027 1028# Get details on warnings generated due to GCC value tracking. 1029KBUILD_CFLAGS += $(CONFIG_CC_OPT_DIAGNOSTICS_SHOW_CONTEXT) 1030 1031# Show inlining notes for __attribute__((warning/error)) call chains. 1032# GCC supports this unconditionally while Clang 23+ provides a flag. 1033KBUILD_CFLAGS += $(CONFIG_CC_OPT_DIAGNOSTICS_SHOW_INLINING_CHAIN) 1034 1035# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1036ifdef CONFIG_ZERO_CALL_USED_REGS 1037KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1038endif 1039 1040ifdef CONFIG_FUNCTION_TRACER 1041ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1042 CC_FLAGS_FTRACE += -mrecord-mcount 1043 ifdef CONFIG_HAVE_NOP_MCOUNT 1044 ifdef CONFIG_CC_HAS_MNOP_MCOUNT 1045 CC_FLAGS_FTRACE += -mnop-mcount 1046 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1047 endif 1048 endif 1049endif 1050ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1051 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1052 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1053 endif 1054endif 1055ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1056 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1057 BUILD_C_RECORDMCOUNT := y 1058 export BUILD_C_RECORDMCOUNT 1059 endif 1060endif 1061ifdef CONFIG_HAVE_FENTRY 1062 ifdef CONFIG_CC_HAS_MFENTRY 1063 CC_FLAGS_FTRACE += -mfentry 1064 CC_FLAGS_USING += -DCC_USING_FENTRY 1065 endif 1066endif 1067export CC_FLAGS_FTRACE 1068KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1069KBUILD_AFLAGS += $(CC_FLAGS_USING) 1070endif 1071 1072# We trigger additional mismatches with less inlining 1073ifdef CONFIG_DEBUG_SECTION_MISMATCH 1074KBUILD_CFLAGS += -fno-inline-functions-called-once 1075endif 1076 1077# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1078ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1079KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1080KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1081LDFLAGS_vmlinux += --gc-sections 1082endif 1083 1084ifdef CONFIG_SHADOW_CALL_STACK 1085ifndef CONFIG_DYNAMIC_SCS 1086CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1087KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1088KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1089endif 1090export CC_FLAGS_SCS 1091endif 1092 1093ifdef CONFIG_RUST_INLINE_HELPERS 1094# `rustc` normally emits traps for unreachable paths during code generation. 1095# With inline helpers, Clang performs code generation from the linked bitcode 1096# instead, so request the same behavior explicitly. Otherwise `objtool` may 1097# follow an impossible Rust path into the next function. 1098CC_FLAGS_RUST_INLINE_HELPERS := -mllvm -trap-unreachable \ 1099 -mllvm -no-trap-after-noreturn 1100export CC_FLAGS_RUST_INLINE_HELPERS 1101endif 1102 1103ifdef CONFIG_LTO_CLANG 1104ifdef CONFIG_LTO_CLANG_FULL 1105CC_FLAGS_LTO := -flto 1106else 1107CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1108 1109# These LLVM options were initially added with only in-process ThinLTO 1110# support, so avoid distributed ThinLTO support for now. 1111ifdef CONFIG_LTO_CLANG_THIN 1112KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1113endif 1114endif 1115CC_FLAGS_LTO += -fvisibility=hidden 1116 1117# Limit inlining across translation units to reduce binary size 1118KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1119endif 1120 1121ifdef CONFIG_LTO 1122KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1123KBUILD_AFLAGS += -fno-lto 1124export CC_FLAGS_LTO 1125endif 1126 1127ifdef CONFIG_CFI 1128CC_FLAGS_CFI := -fsanitize=kcfi 1129ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1130 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1131endif 1132ifdef CONFIG_FINEIBT_BHI 1133 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1134endif 1135ifdef CONFIG_RUST 1136 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1137 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1138 # Disable function merging as LLVM incorrectly merges functions with different KCFI types. 1139 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers -Zmerge-functions=disabled 1140 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1141 export RUSTC_FLAGS_CFI 1142endif 1143KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1144export CC_FLAGS_CFI 1145endif 1146 1147# Architectures can define flags to add/remove for floating-point support 1148CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1149export CC_FLAGS_FPU 1150export CC_FLAGS_NO_FPU 1151 1152ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1153# Set the minimal function alignment. Use the newer GCC option 1154# -fmin-function-alignment if it is available, or fall back to -falign-functions. 1155# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1156ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1157KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1158else 1159KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1160endif 1161endif 1162 1163# arch Makefile may override CC so keep this after arch Makefile is included 1164NOSTDINC_FLAGS += -nostdinc 1165 1166# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1167# the kernel uses only C99 flexible arrays for dynamically sized trailing 1168# arrays. Enforce this for everything that may examine structure sizes and 1169# perform bounds checking. 1170KBUILD_CFLAGS += $(CONFIG_CC_OPT_STRICT_FLEX_ARRAYS) 1171 1172# disable invalid "can't wrap" optimizations for signed / pointers 1173KBUILD_CFLAGS += -fno-strict-overflow 1174 1175# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1176KBUILD_CFLAGS += -fno-stack-check 1177 1178# conserve stack if available 1179ifdef CONFIG_CC_IS_GCC 1180KBUILD_CFLAGS += -fconserve-stack 1181endif 1182 1183# Ensure compilers do not transform certain loops into calls to wcslen() 1184KBUILD_CFLAGS += -fno-builtin-wcslen 1185 1186CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1187ifdef CONFIG_CC_IS_GCC 1188CFLAGS_GCOV += -fno-tree-loop-im 1189# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1190# Only enable if -fprofile-update=prefer-atomic does not introduce new 1191# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1192CFLAGS_GCOV += $(call try-run,\ 1193 echo 'long long x; void f(void){x++;}' | \ 1194 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1195 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1196 echo 'long long x; void f(void){x++;}' | \ 1197 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1198 -ftest-coverage -fprofile-update=prefer-atomic \ 1199 -x c - -c -o "$$TMP" && \ 1200 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1201 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1202 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1203 -fprofile-update=prefer-atomic) 1204endif 1205export CFLAGS_GCOV 1206 1207# change __FILE__ to the relative path to the source directory 1208ifdef building_out_of_srctree 1209CFLAGS_PREFIX_MAP := -fmacro-prefix-map=$(srcroot)/= 1210KBUILD_CPPFLAGS += $(CFLAGS_PREFIX_MAP) 1211KBUILD_USERCFLAGS += $(CFLAGS_PREFIX_MAP) 1212KBUILD_HOSTCFLAGS += $(CFLAGS_PREFIX_MAP) 1213ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1214KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1215endif 1216endif 1217 1218# include additional Makefiles when needed 1219include-y := scripts/Makefile.warn 1220include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1221include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1222include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1223include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1224include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1225include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1226include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1227include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1228include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1229include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1230include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1231include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1232include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1233 1234include $(addprefix $(srctree)/, $(include-y)) 1235 1236# scripts/Makefile.gcc-plugins is intentionally included last. 1237# Do not add $(call cc-option,...) below this line. When you build the kernel 1238# from the clean source tree, the GCC plugins do not exist at this point. 1239 1240# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1241KBUILD_CPPFLAGS += $(KCPPFLAGS) 1242KBUILD_AFLAGS += $(KAFLAGS) 1243KBUILD_CFLAGS += $(KCFLAGS) 1244KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1245 1246KBUILD_LDFLAGS_MODULE += --build-id=sha1 1247LDFLAGS_vmlinux += --build-id=sha1 1248 1249# Specific code, such as outlined KASAN checks, may be placed in 1250# COMDAT-deduplicated sections. Use --force-group-allocation to resolve these 1251# groups when linking modules. The option is available from ld.bfd 2.29 and 1252# ld.lld 19.1.0. 1253KBUILD_LDFLAGS_MODULE += $(CONFIG_LD_OPT_FORCE_GROUP_ALLOCATION) 1254 1255KBUILD_LDFLAGS += -z noexecstack 1256ifeq ($(CONFIG_LD_IS_BFD),y) 1257KBUILD_LDFLAGS += $(CONFIG_LD_OPT_NO_WARN_RWX_SEGMENTS) 1258endif 1259 1260ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1261LDFLAGS_vmlinux += -X 1262endif 1263 1264ifeq ($(CONFIG_RELR),y) 1265# ld.lld before 15 did not support -z pack-relative-relocs. 1266LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1267endif 1268 1269# We never want expected sections to be placed heuristically by the 1270# linker. All sections should be explicitly named in the linker script. 1271ifdef CONFIG_LD_ORPHAN_WARN 1272LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1273endif 1274 1275# --emit-relocs is added by scripts/link-vmlinux.sh, for the final link only. 1276ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1277LDFLAGS_vmlinux += --discard-none 1278endif 1279 1280# Align the architecture of userspace programs with the kernel 1281USERFLAGS_FROM_KERNEL := --target=% 1282 1283ifdef CONFIG_ARCH_USERFLAGS 1284KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1285KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1286else 1287# If not overridden also inherit the bit size 1288USERFLAGS_FROM_KERNEL += -m32 -m64 1289endif 1290 1291KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1292KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1293 1294# userspace programs are linked via the compiler, use the correct linker 1295ifdef CONFIG_CC_IS_CLANG 1296KBUILD_USERLDFLAGS += --ld-path=$(LD) 1297endif 1298 1299# make the checker run with the right architecture 1300CHECKFLAGS += --arch=$(ARCH) 1301 1302# insure the checker run with the right endianness 1303CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1304 1305# the checker needs the correct machine size 1306CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1307 1308# Validate the checker is available and functional 1309ifneq ($(KBUILD_CHECKSRC), 0) 1310 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1311 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1312 KBUILD_CHECKSRC = 0 1313 endif 1314endif 1315 1316# Default kernel image to build when no specific target is given. 1317# KBUILD_IMAGE may be overruled on the command line or 1318# set in the environment 1319# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1320# this default value 1321export KBUILD_IMAGE ?= vmlinux 1322 1323# 1324# INSTALL_PATH specifies where to place the updated kernel and system map 1325# images. Default is /boot, but you can set it to other values 1326export INSTALL_PATH ?= /boot 1327 1328# 1329# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1330# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1331# an argument if needed. Otherwise it defaults to the kernel install path 1332# 1333export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1334 1335# 1336# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1337# relocations required by build roots. This is not defined in the 1338# makefile but the argument can be passed to make if needed. 1339# 1340 1341MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1342export MODLIB 1343 1344PHONY += prepare0 1345 1346ifeq ($(KBUILD_EXTMOD),) 1347 1348build-dir := . 1349clean-dirs := $(sort . Documentation \ 1350 $(patsubst %/,%,$(filter %/, $(core-) \ 1351 $(drivers-) $(libs-)))) 1352 1353export ARCH_CORE := $(core-y) 1354export ARCH_LIB := $(filter %/, $(libs-y)) 1355export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1356# Externally visible symbols (used by link-vmlinux.sh) 1357 1358KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1359KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1360 1361export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1362export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1363 1364ifdef CONFIG_TRIM_UNUSED_KSYMS 1365# For the kernel to actually contain only the needed exported symbols, 1366# we have to build modules as well to determine what those symbols are. 1367KBUILD_MODULES := y 1368endif 1369 1370PHONY += vmlinux_a 1371vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1372 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1373 1374vmlinux.a: vmlinux_a 1375 @: 1376 1377PHONY += vmlinux_o 1378vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1379 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1380 1381vmlinux.o: vmlinux_o 1382 @: 1383 1384PHONY += vmlinux 1385# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1386# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1387# unrelated; the decompressors just happen to have the same base name, 1388# arch/*/boot/compressed/vmlinux. 1389# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1390# 1391# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1392# https://savannah.gnu.org/bugs/?61463 1393# For Make > 4.4, the following simple code will work: 1394# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1395vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1396vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1397vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1398 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1399 1400# The actual objects are generated when descending, 1401# make sure no implicit rule kicks in 1402$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1403 1404ifeq ($(origin KERNELRELEASE),file) 1405filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1406else 1407filechk_kernel.release = echo $(KERNELRELEASE) 1408endif 1409 1410# Store (new) KERNELRELEASE string in include/config/kernel.release 1411include/config/kernel.release: FORCE 1412 $(call filechk,kernel.release) 1413 1414# Additional helpers built in scripts/ 1415# Carefully list dependencies so we do not try to build scripts twice 1416# in parallel 1417PHONY += scripts 1418scripts: scripts_basic scripts_dtc 1419 $(Q)$(MAKE) $(build)=$(@) 1420 1421# Things we need to do before we recursively start building the kernel 1422# or the modules are listed in "prepare". 1423# A multi level approach is used. prepareN is processed before prepareN-1. 1424# archprepare is used in arch Makefiles and when processed asm symlink, 1425# version.h and scripts_basic is processed / created. 1426 1427PHONY += prepare archprepare 1428 1429archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1430 asm-generic $(version_h) include/generated/utsrelease.h \ 1431 include/generated/compile.h include/generated/autoconf.h \ 1432 include/generated/rustc_cfg remove-stale-files 1433 1434prepare0: archprepare 1435 $(Q)$(MAKE) $(build)=scripts/mod 1436 $(Q)$(MAKE) $(build)=. prepare 1437 1438# All the preparing.. 1439prepare: prepare0 1440ifdef CONFIG_RUST 1441 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1442 $(Q)$(MAKE) $(build)=rust 1443endif 1444 1445PHONY += remove-stale-files 1446remove-stale-files: 1447 $(Q)$(srctree)/scripts/remove-stale-files 1448 1449# Support for using generic headers in asm-generic 1450asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1451 1452PHONY += asm-generic uapi-asm-generic 1453asm-generic: uapi-asm-generic 1454 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1455 generic=include/asm-generic 1456uapi-asm-generic: 1457 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1458 generic=include/uapi/asm-generic 1459 1460# Generate some files 1461# --------------------------------------------------------------------------- 1462 1463# KERNELRELEASE can change from a few different places, meaning version.h 1464# needs to be updated, so this check is forced on all builds 1465 1466uts_len := 64 1467define filechk_utsrelease.h 1468 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1469 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1470 exit 1; \ 1471 fi; \ 1472 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1473endef 1474 1475define filechk_version.h 1476 if [ $(SUBLEVEL) -gt 255 ]; then \ 1477 echo \#define LINUX_VERSION_CODE $(shell \ 1478 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1479 else \ 1480 echo \#define LINUX_VERSION_CODE $(shell \ 1481 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1482 fi; \ 1483 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1484 ((c) > 255 ? 255 : (c)))'; \ 1485 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1486 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1487 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1488endef 1489 1490$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1491$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1492$(version_h): FORCE 1493 $(call filechk,version.h) 1494 1495include/generated/utsrelease.h: include/config/kernel.release FORCE 1496 $(call filechk,utsrelease.h) 1497 1498filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1499 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1500 1501include/generated/compile.h: FORCE 1502 $(call filechk,compile.h) 1503 1504PHONY += headerdep 1505headerdep: 1506 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1507 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1508 1509# --------------------------------------------------------------------------- 1510# Kernel headers 1511 1512#Default location for installed headers 1513export INSTALL_HDR_PATH = $(objtree)/usr 1514 1515quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1516 cmd_headers_install = \ 1517 mkdir -p $(INSTALL_HDR_PATH); \ 1518 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1519 usr/include $(INSTALL_HDR_PATH) 1520 1521PHONY += headers_install 1522headers_install: headers 1523 $(call cmd,headers_install) 1524 1525PHONY += archheaders archscripts 1526 1527hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1528 1529PHONY += headers 1530headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1531ifdef HEADER_ARCH 1532 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1533else 1534 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1535 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1536endif 1537 1538ifdef CONFIG_HEADERS_INSTALL 1539prepare: headers 1540endif 1541 1542PHONY += scripts_gen_init_cpio 1543scripts_gen_init_cpio: scripts_basic 1544 $(Q)$(MAKE) $(build)=scripts scripts/gen_init_cpio 1545 1546PHONY += scripts_unifdef 1547scripts_unifdef: scripts_basic 1548 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1549 1550PHONY += scripts_gen_packed_field_checks 1551scripts_gen_packed_field_checks: scripts_basic 1552 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1553 1554# --------------------------------------------------------------------------- 1555# Header check 1556 1557# Check the headers in HEADER_CHECK=(headers|dirs) 1558PHONY += headercheck 1559 1560ifneq ($(HEADER_CHECK),) 1561 1562header-check-dirs := $(filter-out %.h,$(HEADER_CHECK)) 1563header-check-files := $(filter %.h,$(HEADER_CHECK)) $(if $(header-check-dirs),$(shell cd $(srctree) && find $(header-check-dirs) -name '*.h' 2>/dev/null)) 1564header-check-targets := $(patsubst %.h,%.header-check,$(sort $(header-check-files))) 1565 1566headercheck: 1567 $(if $(header-check-targets),,$(error $@ found no headers in HEADER_CHECK="$(HEADER_CHECK)")) 1568 $(Q)$(MAKE) $(header-check-targets) 1569else 1570headercheck: 1571 $(error $@ requires HEADER_CHECK=(headers|dirs)) 1572endif 1573 1574# --------------------------------------------------------------------------- 1575# Install 1576 1577# Many distributions have the custom install script, /sbin/installkernel. 1578# If DKMS is installed, 'make install' will eventually recurse back 1579# to this Makefile to build and install external modules. 1580# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1581 1582quiet_cmd_install = INSTALL $(INSTALL_PATH) 1583 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1584 1585# --------------------------------------------------------------------------- 1586# vDSO install 1587 1588PHONY += vdso_install 1589vdso_install: export INSTALL_FILES = $(vdso-install-y) 1590vdso_install: 1591 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1592 1593# --------------------------------------------------------------------------- 1594# Tools 1595 1596ifdef CONFIG_OBJTOOL 1597prepare: tools/objtool 1598endif 1599 1600ifdef CONFIG_BPF 1601ifdef CONFIG_DEBUG_INFO_BTF 1602prepare: tools/bpf/resolve_btfids 1603endif 1604endif 1605 1606# tools/bootconfig renders the embedded bootconfig into a cmdline at build time. 1607ifdef CONFIG_CMDLINE_FROM_BOOTCONFIG 1608prepare: tools/bootconfig 1609endif 1610 1611# tools/bootconfig is run on the build host during prepare, so force a host 1612# binary here; its own Makefile keeps $(CC) for standalone and cross builds. 1613# CROSS_COMPILE= is cleared so tools/scripts/Makefile.include does not inject 1614# the target's --target=/--sysroot= flags into the host clang invocation under 1615# LLVM=1 cross builds (which would produce a target binary that fails to exec). 1616tools/bootconfig: export CC := $(HOSTCC) 1617tools/bootconfig: FORCE 1618 $(Q)mkdir -p $(objtree)/tools 1619 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ \ 1620 bootconfig CROSS_COMPILE= 1621 1622# The tools build system is not a part of Kbuild and tends to introduce 1623# its own unique issues. If you need to integrate a new tool into Kbuild, 1624# please consider locating that tool outside the tools/ tree and using the 1625# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1626# here. See Documentation/kbuild/makefiles.rst for details. 1627 1628PHONY += resolve_btfids_clean 1629 1630resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1631 1632# tools/bpf/resolve_btfids directory might not exist 1633# in output directory, skip its clean in that case 1634resolve_btfids_clean: 1635ifneq ($(wildcard $(resolve_btfids_O)),) 1636 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1637endif 1638 1639PHONY += objtool_clean objtool_mrproper 1640 1641objtool_O = $(abspath $(objtree))/tools/objtool 1642 1643objtool_clean objtool_mrproper: 1644ifneq ($(wildcard $(objtool_O)),) 1645 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1646endif 1647 1648PHONY += bootconfig_clean 1649 1650bootconfig_O = $(abspath $(objtree))/tools/bootconfig 1651 1652bootconfig_clean: 1653ifneq ($(wildcard $(bootconfig_O)),) 1654 $(Q)$(MAKE) -sC $(srctree)/tools/bootconfig O=$(bootconfig_O) clean 1655endif 1656 1657tools/: FORCE 1658 $(Q)mkdir -p $(objtree)/tools 1659 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1660 1661tools/%: FORCE 1662 $(Q)mkdir -p $(objtree)/tools 1663 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1664 1665# --------------------------------------------------------------------------- 1666# Kernel selftest 1667 1668PHONY += kselftest 1669kselftest: headers 1670 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1671 1672kselftest-%: headers FORCE 1673 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests $* 1674 1675PHONY += kselftest-merge 1676kselftest-merge: 1677 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1678 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1679 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1680 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1681 1682# --------------------------------------------------------------------------- 1683# Devicetree files 1684 1685ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1686dtstree := arch/$(SRCARCH)/boot/dts 1687endif 1688 1689dtbindingtree := Documentation/devicetree/bindings 1690 1691%.yaml: dtbs_prepare 1692 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1693 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1694 1695ifneq ($(dtstree),) 1696 1697%.dtb: dtbs_prepare 1698 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1699 1700%.dtbo: dtbs_prepare 1701 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1702 1703PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1704dtbs: dtbs_prepare 1705 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1706 1707# include/config/kernel.release is actually needed when installing DTBs because 1708# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1709# dtbs_install depend on it as dtbs_install may run as root. 1710dtbs_prepare: include/config/kernel.release scripts_dtc 1711 1712ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1713export CHECK_DTBS=y 1714endif 1715 1716ifneq ($(CHECK_DTBS),) 1717dtbs_prepare: dt_binding_schemas 1718endif 1719 1720dtbs_check: dtbs 1721 1722dtbs_install: 1723 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1724 1725ifdef CONFIG_OF_EARLY_FLATTREE 1726all: dtbs 1727endif 1728 1729ifdef CONFIG_GENERIC_BUILTIN_DTB 1730vmlinux: dtbs 1731endif 1732 1733endif 1734 1735PHONY += scripts_dtc 1736scripts_dtc: scripts_basic 1737 $(Q)$(MAKE) $(build)=scripts/dtc 1738 1739ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1740export CHECK_DTBS=y 1741endif 1742 1743PHONY += dt_binding_check dt_binding_schemas 1744dt_binding_check: dt_binding_schemas scripts_dtc 1745 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1746 1747dt_binding_schemas: 1748 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1749 1750PHONY += dt_compatible_check 1751dt_compatible_check: dt_binding_schemas 1752 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1753 1754PHONY += dt_style_selftest 1755dt_style_selftest: 1756 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1757 1758# --------------------------------------------------------------------------- 1759# Modules 1760 1761ifdef CONFIG_MODULES 1762 1763# By default, build modules as well 1764 1765all: modules 1766 1767# When we're building modules with modversions, we need to consider 1768# the built-in objects during the descend as well, in order to 1769# make sure the checksums are up to date before we record them. 1770ifdef CONFIG_MODVERSIONS 1771 KBUILD_BUILTIN := y 1772endif 1773 1774# Build modules 1775# 1776 1777# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1778# is an exception. 1779ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1780KBUILD_BUILTIN := y 1781modules: vmlinux 1782endif 1783 1784modules: modules_prepare 1785 1786# Target to prepare building external modules 1787modules_prepare: prepare 1788 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1789 1790endif # CONFIG_MODULES 1791 1792### 1793# Cleaning is done on three levels. 1794# make clean Delete most generated files 1795# Leave enough to build external modules 1796# make mrproper Delete the current configuration, and all generated files 1797# make distclean Remove editor backup files, patch leftover files and the like 1798 1799# Directories & files removed with 'make clean' 1800CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1801 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1802 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1803 vmlinux.thinlto-index builtin.order \ 1804 compile_commands.json rust/test \ 1805 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1806 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1807 1808# Directories & files removed with 'make mrproper' 1809MRPROPER_FILES += include/config include/generated \ 1810 arch/$(SRCARCH)/include/generated .objdiff \ 1811 debian snap tar-install PKGBUILD pacman \ 1812 .config .config.old .version \ 1813 Module.symvers \ 1814 certs/signing_key.pem \ 1815 certs/x509.genkey \ 1816 vmlinux-gdb.py \ 1817 rpmbuild \ 1818 rust/libmacros.so rust/libmacros.dylib \ 1819 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1820 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1821 1822# clean - Delete most, but leave enough to build external modules 1823# 1824clean: private rm-files := $(CLEAN_FILES) 1825 1826PHONY += archclean vmlinuxclean 1827 1828vmlinuxclean: 1829 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1830 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1831 1832clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean bootconfig_clean 1833 1834# mrproper - Delete all generated files, including .config 1835# 1836mrproper: private rm-files := $(MRPROPER_FILES) 1837mrproper-dirs := $(addprefix _mrproper_,scripts) 1838 1839PHONY += $(mrproper-dirs) mrproper 1840$(mrproper-dirs): 1841 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1842 1843mrproper: clean objtool_mrproper $(mrproper-dirs) 1844 $(call cmd,rmfiles) 1845 @find . $(RCS_FIND_IGNORE) \ 1846 \( -name '*.rmeta' \) \ 1847 -type f -print | xargs rm -f 1848 1849# distclean 1850# 1851PHONY += distclean 1852 1853distclean: mrproper 1854 @find . $(RCS_FIND_IGNORE) \ 1855 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1856 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1857 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1858 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1859 -type f -print | xargs rm -f 1860 1861 1862# Packaging of the kernel to various formats 1863# --------------------------------------------------------------------------- 1864 1865modules-cpio-pkg: scripts_gen_init_cpio 1866 1867%src-pkg: FORCE 1868 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1869%pkg: include/config/kernel.release FORCE 1870 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1871 1872# Brief documentation of the typical targets used 1873# --------------------------------------------------------------------------- 1874 1875boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1876boards := $(sort $(notdir $(boards))) 1877board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1878board-dirs := $(sort $(notdir $(board-dirs:/=))) 1879 1880PHONY += help 1881help: 1882 @echo 'Cleaning targets:' 1883 @echo ' clean - Remove most generated files but keep the config and' 1884 @echo ' enough build support to build external modules' 1885 @echo ' mrproper - Remove all generated files + config + various backup files' 1886 @echo ' distclean - mrproper + remove editor backup and patch files' 1887 @echo '' 1888 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1889 @echo '' 1890 @echo 'Other generic targets:' 1891 @echo ' all - Build all targets marked with [*]' 1892 @echo '* vmlinux - Build the bare kernel' 1893 @echo '* modules - Build all modules' 1894 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1895 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1896 @echo ' dir/ - Build all files in dir and below' 1897 @echo ' dir/file.[ois] - Build specified target only' 1898 @echo ' dir/file.ll - Build the LLVM assembly file' 1899 @echo ' (requires compiler support for LLVM assembly generation)' 1900 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1901 @echo ' (requires a recent binutils and recent build (System.map))' 1902 @echo ' dir/file.ko - Build module including final link' 1903 @echo ' modules_prepare - Set up for building external modules' 1904 @echo ' tags/TAGS - Generate tags file for editors' 1905 @echo ' cscope - Generate cscope index' 1906 @echo ' gtags - Generate GNU GLOBAL index' 1907 @echo ' kernelrelease - Output the release version string (use with make -s)' 1908 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1909 @echo ' image_name - Output the image name (use with make -s)' 1910 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1911 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1912 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1913 echo '' 1914 @echo 'Static analysers:' 1915 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1916 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1917 @echo ' versioncheck - Sanity check on version.h usage' 1918 @echo ' includecheck - Check for duplicate included header files' 1919 @echo ' headerdep - Detect inclusion cycles in headers' 1920 @echo ' headercheck - Check headers in HEADER_CHECK=(headers|dirs) are' 1921 @echo ' self-contained, have header guards, and pass kernel-doc.' 1922 @echo ' coccicheck - Check with Coccinelle' 1923 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1924 @echo ' clang-analyzer - Check with clang static analyzer' 1925 @echo ' clang-tidy - Check with clang-tidy' 1926 @echo '' 1927 @echo 'Tools:' 1928 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1929 @echo ' sbom - Generate Software Bill of Materials' 1930 @echo '' 1931 @echo 'Kernel selftest:' 1932 @echo ' kselftest - Build and run kernel selftest' 1933 @echo ' Build, install, and boot kernel before' 1934 @echo ' running kselftest on it' 1935 @echo ' Run as root for full coverage' 1936 @echo ' kselftest-all - Build kernel selftest' 1937 @echo ' kselftest-install - Build and install kernel selftest' 1938 @echo ' kselftest-clean - Remove all generated kselftest files' 1939 @echo ' kselftest-merge - Merge all the config dependencies of' 1940 @echo ' kselftest to existing .config.' 1941 @echo '' 1942 @echo 'Rust targets:' 1943 @echo ' rustavailable - Checks whether the Rust toolchain is' 1944 @echo ' available and, if not, explains why.' 1945 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1946 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1947 @echo ' is formatted, printing a diff otherwise.' 1948 @echo ' rustdoc - Generate Rust documentation' 1949 @echo ' (requires kernel .config)' 1950 @echo ' rusttest - Runs the Rust tests' 1951 @echo ' (requires kernel .config; downloads external repos)' 1952 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1953 @echo ' (requires kernel .config)' 1954 @echo ' dir/file.[os] - Build specified target only' 1955 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1956 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1957 @echo ' The output is not intended to be compilable.' 1958 @echo ' dir/file.ll - Build the LLVM assembly file' 1959 @echo '' 1960 @$(if $(dtstree), \ 1961 echo 'Devicetree:'; \ 1962 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1963 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1964 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1965 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1966 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1967 echo ' dtbs_check - Validate device tree source files';\ 1968 echo '') 1969 1970 @echo 'Userspace tools targets:' 1971 @echo ' use "make tools/help"' 1972 @echo ' or "cd tools; make help"' 1973 @echo '' 1974 @echo 'Kernel packaging:' 1975 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1976 @echo '' 1977 @echo 'Documentation targets:' 1978 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1979 @echo '' 1980 @echo 'Architecture-specific targets ($(SRCARCH)):' 1981 @$(or $(archhelp),\ 1982 echo ' No architecture-specific help defined for $(SRCARCH)') 1983 @echo '' 1984 @$(if $(boards), \ 1985 $(foreach b, $(boards), \ 1986 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1987 echo '') 1988 @$(if $(board-dirs), \ 1989 $(foreach b, $(board-dirs), \ 1990 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1991 printf " %-16s - Show all of the above\\n" help-boards; \ 1992 echo '') 1993 1994 @echo ' make V=n [targets] 1: verbose build' 1995 @echo ' 2: give reason for rebuild of target' 1996 @echo ' V=1 and V=2 can be combined with V=12' 1997 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1998 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1999 @echo ' (sparse by default)' 2000 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 2001 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 2002 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 2003 @echo ' 1: warnings which may be relevant and do not occur too often' 2004 @echo ' 2: warnings which occur quite often but may still be relevant' 2005 @echo ' 3: more obscure warnings, can most likely be ignored' 2006 @echo ' c: extra checks in the configuration stage (Kconfig)' 2007 @echo ' e: warnings are being treated as errors' 2008 @echo ' Multiple levels can be combined with W=12 or W=123' 2009 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 2010 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 2011 @$(if $(dtstree), \ 2012 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 2013 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 2014 ) 2015 @echo '' 2016 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 2017 @echo 'For further info see the ./README file' 2018 2019 2020help-board-dirs := $(addprefix help-,$(board-dirs)) 2021 2022help-boards: $(help-board-dirs) 2023 2024boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 2025 2026$(help-board-dirs): help-%: 2027 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 2028 @$(if $(boards-per-dir), \ 2029 $(foreach b, $(boards-per-dir), \ 2030 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 2031 echo '') 2032 2033 2034# Documentation targets 2035# --------------------------------------------------------------------------- 2036DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 2037 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 2038 htmldocs-redirects testdocs 2039 2040PHONY += $(DOC_TARGETS) 2041$(DOC_TARGETS): 2042 $(Q)$(MAKE) $(build)=Documentation $@ 2043 2044 2045# Rust targets 2046# --------------------------------------------------------------------------- 2047 2048# "Is Rust available?" target 2049PHONY += rustavailable 2050rustavailable: 2051 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 2052 2053# Documentation target 2054# 2055# Using the singular to avoid running afoul of `no-dot-config-targets`. 2056PHONY += rustdoc 2057rustdoc: prepare 2058 $(Q)$(MAKE) $(build)=rust $@ 2059 2060# Testing target 2061PHONY += rusttest 2062rusttest: prepare 2063 $(Q)$(MAKE) $(build)=rust $@ 2064 2065# Formatting targets 2066# 2067# Generated files as well as vendored crates are skipped. 2068PHONY += rustfmt rustfmtcheck 2069 2070rustfmt: 2071 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 2072 \( \ 2073 -path $(srctree)/rust/proc-macro2 \ 2074 -o -path $(srctree)/rust/quote \ 2075 -o -path $(srctree)/rust/syn \ 2076 -o -path $(srctree)/rust/zerocopy \ 2077 -o -path $(srctree)/rust/zerocopy-derive \ 2078 \) -prune -o \ 2079 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2080 | xargs $(RUSTFMT) $(rustfmt_flags) 2081 2082rustfmtcheck: rustfmt_flags = --check 2083rustfmtcheck: rustfmt 2084 2085# Misc 2086# --------------------------------------------------------------------------- 2087 2088PHONY += misc-check 2089misc-check: 2090 $(Q)$(srctree)/scripts/misc-check 2091 2092all: misc-check 2093 2094PHONY += scripts_gdb 2095scripts_gdb: prepare0 2096 $(Q)$(MAKE) $(build)=scripts/gdb 2097 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2098 2099ifdef CONFIG_GDB_SCRIPTS 2100all: scripts_gdb 2101endif 2102 2103else # KBUILD_EXTMOD 2104 2105filechk_kernel.release = echo $(KERNELRELEASE) 2106 2107### 2108# External module support. 2109# When building external modules the kernel used as basis is considered 2110# read-only, and no consistency checks are made and the make 2111# system is not used on the basis kernel. If updates are required 2112# in the basis kernel ordinary make commands (without M=...) must be used. 2113 2114# We are always building only modules. 2115KBUILD_BUILTIN := 2116KBUILD_MODULES := y 2117 2118build-dir := . 2119 2120clean-dirs := . 2121clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2122 2123PHONY += prepare 2124# now expand this into a simple variable to reduce the cost of shell evaluations 2125prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2126prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2127prepare: 2128 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2129 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2130 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2131 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2132 fi 2133 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2134 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2135 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2136 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2137 fi 2138 2139PHONY += help 2140help: 2141 @echo ' Building external modules.' 2142 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2143 @echo '' 2144 @echo ' modules - default target, build the module(s)' 2145 @echo ' modules_install - install the module' 2146 @echo ' clean - remove generated files in module directory only' 2147 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2148 @echo '' 2149 2150ifndef CONFIG_MODULES 2151modules modules_install: __external_modules_error 2152__external_modules_error: 2153 @echo >&2 '***' 2154 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2155 @echo >&2 '*** You cannot build or install external modules.' 2156 @echo >&2 '***' 2157 @false 2158endif 2159 2160endif # KBUILD_EXTMOD 2161 2162# --------------------------------------------------------------------------- 2163# Modules 2164 2165PHONY += modules modules_install modules_sign modules_prepare 2166 2167modules_install: 2168 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2169 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2170 2171ifeq ($(CONFIG_MODULE_SIG),y) 2172# modules_sign is a subset of modules_install. 2173# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2174modules_sign: modules_install 2175 @: 2176else 2177modules_sign: 2178 @echo >&2 '***' 2179 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2180 @echo >&2 '***' 2181 @false 2182endif 2183 2184ifdef CONFIG_MODULES 2185 2186modules.order: $(build-dir) 2187 @: 2188 2189# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2190# This is solely useful to speed up test compiles. 2191modules: modpost 2192ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2193 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2194endif 2195 2196PHONY += modules_check 2197modules_check: modules.order 2198 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2199 2200else # CONFIG_MODULES 2201 2202modules: 2203 @: 2204 2205KBUILD_MODULES := 2206 2207endif # CONFIG_MODULES 2208 2209PHONY += modpost 2210modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2211 $(if $(KBUILD_MODULES), modules_check) 2212 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2213 2214# Single targets 2215# --------------------------------------------------------------------------- 2216# To build individual files in subdirectories, you can do like this: 2217# 2218# make foo/bar/baz.s 2219# 2220# The supported suffixes for single-target are listed in 'single-targets' 2221# 2222# To build only under specific subdirectories, you can do like this: 2223# 2224# make foo/bar/baz/ 2225 2226ifdef single-build 2227 2228# .ko is special because modpost is needed 2229single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2230single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2231 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2232 2233$(single-ko): single_modules 2234 @: 2235$(single-no-ko): $(build-dir) 2236 @: 2237 2238# Remove modules.order when done because it is not the real one. 2239PHONY += single_modules 2240single_modules: $(single-no-ko) modules_prepare 2241 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2242 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2243ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2244 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2245endif 2246 $(Q)rm -f modules.order 2247 2248single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2249 2250KBUILD_MODULES := y 2251 2252endif 2253 2254prepare: outputmakefile 2255 2256# Preset locale variables to speed up the build process. Limit locale 2257# tweaks to this spot to avoid wrong language settings when running 2258# make menuconfig etc. 2259# Error messages still appears in the original language 2260PHONY += $(build-dir) 2261$(build-dir): prepare 2262 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2263 2264clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2265PHONY += $(clean-dirs) clean 2266$(clean-dirs): 2267 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2268 2269clean: $(clean-dirs) 2270 $(call cmd,rmfiles) 2271 @find . $(RCS_FIND_IGNORE) \ 2272 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2273 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2274 -o -name '*.dtb' -o -name '*.dtbo' \ 2275 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2276 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2277 -o -name '*.dwo' -o -name '*.lst' \ 2278 -o -name '*.su' -o -name '*.mod' \ 2279 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2280 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2281 -o -name '*.asn1.[ch]' \ 2282 -o -name '*.symtypes' -o -name 'modules.order' \ 2283 -o -name '*.c.[012]*.*' \ 2284 -o -name '*.ll' \ 2285 -o -name '*.gcno' \ 2286 -o -name '*.long-type-*.txt' \ 2287 -o -name '*.header-check' \ 2288 \) -type f -print \ 2289 -o -name '.tmp_*' -print \ 2290 | xargs rm -rf 2291 2292# Generate tags for editors 2293# --------------------------------------------------------------------------- 2294quiet_cmd_tags = GEN $@ 2295 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2296 2297tags TAGS cscope gtags: FORCE 2298 $(call cmd,tags) 2299 2300# Generate rust-project.json (a file that describes the structure of non-Cargo 2301# Rust projects) for rust-analyzer (an implementation of the Language Server 2302# Protocol). 2303PHONY += rust-analyzer 2304rust-analyzer: 2305 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2306ifdef KBUILD_EXTMOD 2307# FIXME: external modules must not descend into a sub-directory of the kernel 2308 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2309else 2310 $(Q)$(MAKE) $(build)=rust $@ 2311endif 2312 2313# Script to generate missing namespace dependencies 2314# --------------------------------------------------------------------------- 2315 2316PHONY += nsdeps 2317nsdeps: export KBUILD_NSDEPS=1 2318nsdeps: modules 2319 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2320 2321# Script to generate .spdx.json SBOM documents describing the build 2322# --------------------------------------------------------------------------- 2323 2324ifdef building_out_of_srctree 2325sbom_targets := sbom-source.spdx.json 2326endif 2327sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2328quiet_cmd_sbom = GEN $(sbom_targets) 2329 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2330 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2331 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2332 --src-tree $(abspath $(srctree)) \ 2333 --obj-tree $(abspath $(objtree)) \ 2334 --roots-file "$(tmp-target)" \ 2335 --output-directory $(abspath $(objtree)) \ 2336 --generate-spdx \ 2337 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2338 --package-version "$(KERNELVERSION)" \ 2339 --write-output-on-error; 2340PHONY += sbom 2341sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2342 $(call cmd,sbom) 2343 2344# Clang Tooling 2345# --------------------------------------------------------------------------- 2346 2347quiet_cmd_gen_compile_commands = GEN $@ 2348 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2349 2350compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2351 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2352 $(if $(CONFIG_MODULES), modules.order) FORCE 2353 $(call if_changed,gen_compile_commands) 2354 2355targets += compile_commands.json 2356 2357PHONY += clang-tidy clang-analyzer 2358 2359ifdef CONFIG_CC_IS_CLANG 2360quiet_cmd_clang_tools = CHECK $< 2361 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2362 2363clang-tidy clang-analyzer: compile_commands.json 2364 $(call cmd,clang_tools) 2365else 2366clang-tidy clang-analyzer: 2367 @echo "$@ requires CC=clang" >&2 2368 @false 2369endif 2370 2371# Scripts to check various things for consistency 2372# --------------------------------------------------------------------------- 2373 2374PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2375 2376includecheck: 2377 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2378 -name '*.[hcS]' -type f -print | sort \ 2379 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2380 2381versioncheck: 2382 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2383 -name '*.[hcS]' -type f -print | sort \ 2384 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2385 2386coccicheck: 2387 $(Q)$(BASH) $(srctree)/scripts/$@ 2388 2389kconfig-sym-check: 2390 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2391 2392PHONY += checkstack kernelrelease kernelversion image_name 2393 2394# UML needs a little special treatment here. It wants to use the host 2395# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2396# else wants $(ARCH), including people doing cross-builds, which means 2397# that $(SUBARCH) doesn't work here. 2398ifeq ($(ARCH), um) 2399CHECKSTACK_ARCH := $(SUBARCH) 2400else 2401CHECKSTACK_ARCH := $(ARCH) 2402endif 2403MINSTACKSIZE ?= 100 2404checkstack: 2405 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2406 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2407 2408kernelrelease: 2409 @$(filechk_kernel.release) 2410 2411kernelversion: 2412 @echo $(KERNELVERSION) 2413 2414image_name: 2415 @echo $(KBUILD_IMAGE) 2416 2417PHONY += run-command 2418run-command: 2419 $(Q)$(KBUILD_RUN_COMMAND) 2420 2421quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2422 cmd_rmfiles = rm -rf $(rm-files) 2423 2424# read saved command lines for existing targets 2425existing-targets := $(wildcard $(sort $(targets))) 2426 2427-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2428 2429endif # config-build 2430endif # mixed-build 2431endif # need-sub-make 2432 2433PHONY += FORCE 2434FORCE: 2435 2436# Declare the contents of the PHONY variable as phony. We keep that 2437# information in a variable so we can use it in if_changed and friends. 2438.PHONY: $(PHONY) 2439