1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = -rc6 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 run-command 302no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 303 image_name 304single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 305 306config-build := 307mixed-build := 308need-config := 1 309may-sync-config := 1 310single-build := 311 312ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 313 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 314 need-config := 315 endif 316endif 317 318ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 319 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 320 may-sync-config := 321 endif 322endif 323 324need-compiler := $(may-sync-config) 325 326ifneq ($(KBUILD_EXTMOD),) 327 may-sync-config := 328endif 329 330ifeq ($(KBUILD_EXTMOD),) 331 ifneq ($(filter %config,$(MAKECMDGOALS)),) 332 config-build := 1 333 ifneq ($(words $(MAKECMDGOALS)),1) 334 mixed-build := 1 335 endif 336 endif 337endif 338 339# We cannot build single targets and the others at the same time 340ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 341 single-build := 1 342 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 343 mixed-build := 1 344 endif 345endif 346 347# For "make -j clean all", "make -j mrproper defconfig all", etc. 348ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 349 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 350 mixed-build := 1 351 endif 352endif 353 354# install and modules_install need also be processed one by one 355ifneq ($(filter install,$(MAKECMDGOALS)),) 356 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 357 mixed-build := 1 358 endif 359endif 360 361ifdef mixed-build 362# =========================================================================== 363# We're called with mixed targets (*config and build targets). 364# Handle them one by one. 365 366PHONY += $(MAKECMDGOALS) __build_one_by_one 367 368$(MAKECMDGOALS): __build_one_by_one 369 @: 370 371__build_one_by_one: 372 $(Q)set -e; \ 373 for i in $(MAKECMDGOALS); do \ 374 $(MAKE) -f $(srctree)/Makefile $$i; \ 375 done 376 377else # !mixed-build 378 379include $(srctree)/scripts/Kbuild.include 380 381# Read KERNELRELEASE from include/config/kernel.release (if it exists) 382KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 383KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 384export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 385 386include $(srctree)/scripts/subarch.include 387 388# Cross compiling and selecting different set of gcc/bin-utils 389# --------------------------------------------------------------------------- 390# 391# When performing cross compilation for other architectures ARCH shall be set 392# to the target architecture. (See arch/* for the possibilities). 393# ARCH can be set during invocation of make: 394# make ARCH=arm64 395# Another way is to have ARCH set in the environment. 396# The default ARCH is the host where make is executed. 397 398# CROSS_COMPILE specify the prefix used for all executables used 399# during compilation. Only gcc and related bin-utils executables 400# are prefixed with $(CROSS_COMPILE). 401# CROSS_COMPILE can be set on the command line 402# make CROSS_COMPILE=aarch64-linux-gnu- 403# Alternatively CROSS_COMPILE can be set in the environment. 404# Default value for CROSS_COMPILE is not to prefix executables 405# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 406ARCH ?= $(SUBARCH) 407 408# Architecture as present in compile.h 409UTS_MACHINE := $(ARCH) 410SRCARCH := $(ARCH) 411 412# Additional ARCH settings for x86 413ifeq ($(ARCH),i386) 414 SRCARCH := x86 415endif 416ifeq ($(ARCH),x86_64) 417 SRCARCH := x86 418endif 419 420# Additional ARCH settings for sparc 421ifeq ($(ARCH),sparc32) 422 SRCARCH := sparc 423endif 424ifeq ($(ARCH),sparc64) 425 SRCARCH := sparc 426endif 427 428# Additional ARCH settings for parisc 429ifeq ($(ARCH),parisc64) 430 SRCARCH := parisc 431endif 432 433export cross_compiling := 434ifneq ($(SRCARCH),$(SUBARCH)) 435cross_compiling := 1 436endif 437 438KCONFIG_CONFIG ?= .config 439export KCONFIG_CONFIG 440 441# SHELL used by kbuild 442CONFIG_SHELL := sh 443 444HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 445HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 446HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 447 448ifneq ($(LLVM),) 449ifneq ($(filter %/,$(LLVM)),) 450LLVM_PREFIX := $(LLVM) 451else ifneq ($(filter -%,$(LLVM)),) 452LLVM_SUFFIX := $(LLVM) 453else ifneq ($(LLVM),1) 454$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 455endif 456 457HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 458HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 459else 460HOSTCC = gcc 461HOSTCXX = g++ 462endif 463HOSTRUSTC = rustc 464HOSTPKG_CONFIG = pkg-config 465 466# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 467# has a logic to call it 468KERNELDOC = $(srctree)/tools/docs/kernel-doc 469export KERNELDOC 470 471KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 472 -O2 -fomit-frame-pointer -std=gnu11 473KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 474KBUILD_USERLDFLAGS := $(USERLDFLAGS) 475 476# These flags apply to all Rust code in the tree, including the kernel and 477# host programs. 478# 479# `-Aclippy::unwrap_or_default`: the lint is buggy [1] and ignores our 480# MSRV. It can trigger depending on the optimization level. 481# [1] https://github.com/rust-lang/rust-clippy/issues/17379 482export rust_common_flags := --edition=2021 \ 483 -Zbinary_dep_depinfo=y \ 484 -Astable_features \ 485 -Aunused_features \ 486 -Dnon_ascii_idents \ 487 -Dunsafe_op_in_unsafe_fn \ 488 -Wmissing_docs \ 489 -Wrust_2018_idioms \ 490 -Wunreachable_pub \ 491 -Wclippy::all \ 492 -Wclippy::as_ptr_cast_mut \ 493 -Wclippy::as_underscore \ 494 -Wclippy::cast_lossless \ 495 -Aclippy::collapsible_if \ 496 -Aclippy::collapsible_match \ 497 -Wclippy::ignored_unit_patterns \ 498 -Aclippy::incompatible_msrv \ 499 -Wclippy::mut_mut \ 500 -Wclippy::needless_bitwise_bool \ 501 -Aclippy::needless_lifetimes \ 502 -Wclippy::no_mangle_with_rust_abi \ 503 -Wclippy::ptr_as_ptr \ 504 -Wclippy::ptr_cast_constness \ 505 -Wclippy::ref_as_ptr \ 506 -Wclippy::undocumented_unsafe_blocks \ 507 -Aclippy::uninlined_format_args \ 508 -Wclippy::unnecessary_safety_comment \ 509 -Wclippy::unnecessary_safety_doc \ 510 -Aclippy::unwrap_or_default \ 511 -Wrustdoc::missing_crate_level_docs \ 512 -Wrustdoc::unescaped_backticks 513 514KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 515 $(HOSTCFLAGS) -I $(srctree)/scripts/include 516KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 517 -I $(srctree)/scripts/include 518KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 519 -Zallow-features= 520KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 521KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 522KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 523 524# Make variables (CC, etc...) 525CPP = $(CC) -E 526ifneq ($(LLVM),) 527CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 528LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 529AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 530LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 531NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 532OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 533OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 534READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 535STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 536ifeq ($(filter -fuse-ld=% --ld-path=%,$(KBUILD_HOSTLDFLAGS)),) 537KBUILD_HOSTLDFLAGS += -fuse-ld=lld 538endif 539else 540CC = $(CROSS_COMPILE)gcc 541LD = $(CROSS_COMPILE)ld 542AR = $(CROSS_COMPILE)ar 543NM = $(CROSS_COMPILE)nm 544OBJCOPY = $(CROSS_COMPILE)objcopy 545OBJDUMP = $(CROSS_COMPILE)objdump 546READELF = $(CROSS_COMPILE)readelf 547STRIP = $(CROSS_COMPILE)strip 548endif 549RUSTC = rustc 550RUSTDOC = rustdoc 551RUSTFMT = rustfmt 552CLIPPY_DRIVER = clippy-driver 553BINDGEN = bindgen 554PAHOLE = pahole 555RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 556LEX = flex 557YACC = bison 558AWK = awk 559INSTALLKERNEL := installkernel 560PERL = perl 561PYTHON3 = python3 562CHECK = sparse 563BASH = bash 564KGZIP = gzip 565KBZIP2 = bzip2 566KLZOP = lzop 567LZMA = lzma 568LZ4 = lz4 569XZ = xz 570ZSTD = zstd 571TAR = tar 572 573CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 574 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 575NOSTDINC_FLAGS := 576CFLAGS_MODULE = 577RUSTFLAGS_MODULE = 578AFLAGS_MODULE = 579LDFLAGS_MODULE = 580CFLAGS_KERNEL = 581RUSTFLAGS_KERNEL = 582AFLAGS_KERNEL = 583LDFLAGS_vmlinux = 584 585# Use USERINCLUDE when you must reference the UAPI directories only. 586USERINCLUDE := \ 587 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 588 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 589 -I$(srctree)/include/uapi \ 590 -I$(objtree)/include/generated/uapi \ 591 -include $(srctree)/include/linux/compiler-version.h \ 592 -include $(srctree)/include/linux/kconfig.h 593 594# Use LINUXINCLUDE when you must reference the include/ directory. 595# Needed to be compatible with the O= option 596LINUXINCLUDE := \ 597 -I$(srctree)/arch/$(SRCARCH)/include \ 598 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 599 -I$(srctree)/include \ 600 -I$(objtree)/include \ 601 $(USERINCLUDE) 602 603KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 604 605KBUILD_CFLAGS := 606KBUILD_CFLAGS += -fshort-wchar 607KBUILD_CFLAGS += -funsigned-char 608KBUILD_CFLAGS += -fno-common 609KBUILD_CFLAGS += -fno-PIE 610KBUILD_CFLAGS += -fno-strict-aliasing 611 612KBUILD_CPPFLAGS := -D__KERNEL__ 613KBUILD_RUSTFLAGS := $(rust_common_flags) \ 614 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 615 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 616 -Csymbol-mangling-version=v0 \ 617 -Crelocation-model=static \ 618 -Zfunction-sections=n \ 619 -Wclippy::float_arithmetic 620KBUILD_RUSTFLAGS_OPTION_CHKS := 621 622KBUILD_AFLAGS_KERNEL := 623KBUILD_CFLAGS_KERNEL := 624KBUILD_RUSTFLAGS_KERNEL := 625KBUILD_AFLAGS_MODULE := -DMODULE 626KBUILD_CFLAGS_MODULE := -DMODULE 627KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 628KBUILD_LDFLAGS_MODULE := 629KBUILD_LDFLAGS := 630CLANG_FLAGS := 631 632ifeq ($(KBUILD_CLIPPY),1) 633 RUSTC_OR_CLIPPY_QUIET := CLIPPY 634 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 635else 636 RUSTC_OR_CLIPPY_QUIET := RUSTC 637 RUSTC_OR_CLIPPY = $(RUSTC) 638endif 639 640# Allows the usage of unstable features in stable compilers. 641export RUSTC_BOOTSTRAP := 1 642 643# Allows finding `.clippy.toml` in out-of-srctree builds. 644export CLIPPY_CONF_DIR := $(srctree) 645 646export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 647export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 648export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 649export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 650export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 651export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 652export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 653export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 654 655export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 656export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 657export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 658export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 659export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 660export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 661 662# Files to ignore in find ... statements 663 664export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 665 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 666 -prune -o 667 668# =========================================================================== 669# Rules shared between *config targets and build targets 670 671# Basic helpers built in scripts/basic/ 672PHONY += scripts_basic 673scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 674scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 675scripts_basic: 676 $(Q)$(MAKE) $(build)=scripts/basic 677 678PHONY += outputmakefile 679ifdef building_out_of_srctree 680# Before starting out-of-tree build, make sure the source tree is clean. 681# outputmakefile generates a Makefile in the output directory, if using a 682# separate output directory. This allows convenient use of make in the 683# output directory. 684# At the same time when output Makefile generated, generate .gitignore to 685# ignore whole output directory 686 687ifdef KBUILD_EXTMOD 688print_env_for_makefile = \ 689 echo "export KBUILD_OUTPUT = $(objtree)"; \ 690 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 691 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 692else 693print_env_for_makefile = \ 694 echo "export KBUILD_OUTPUT = $(CURDIR)" 695endif 696 697filechk_makefile = { \ 698 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 699 $(print_env_for_makefile); \ 700 echo "include $(abs_srctree)/Makefile"; \ 701 } 702 703PHONY += $(CURDIR)/Makefile 704$(CURDIR)/Makefile: FORCE 705 $(call filechk,makefile) 706 707outputmakefile: $(CURDIR)/Makefile 708ifeq ($(KBUILD_EXTMOD),) 709 @if [ -f $(srctree)/.config -o \ 710 -d $(srctree)/include/config -o \ 711 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 712 echo >&2 "***"; \ 713 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 714 echo >&2 "*** in $(abs_srctree)";\ 715 echo >&2 "***"; \ 716 false; \ 717 fi 718else 719 @if [ -f $(srcroot)/modules.order ]; then \ 720 echo >&2 "***"; \ 721 echo >&2 "*** The external module source tree is not clean."; \ 722 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 723 echo >&2 "***"; \ 724 false; \ 725 fi 726endif 727 $(Q)ln -fsn $(srcroot) source 728 $(Q)test -e .gitignore || \ 729 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 730endif 731 732# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 733# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 734# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 735# Kconfig (so they need export), and from include/config/auto.conf.cmd to 736# detect the version changes between builds. 737CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 738RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 739PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 740 741ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 742include $(srctree)/scripts/Makefile.clang 743endif 744 745# Include this also for config targets because some architectures need 746# cc-cross-prefix to determine CROSS_COMPILE. 747ifdef need-compiler 748include $(srctree)/scripts/Makefile.compiler 749endif 750 751ifdef config-build 752# =========================================================================== 753# *config targets only - make sure prerequisites are updated, and descend 754# in scripts/kconfig to make the *config target 755 756# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 757# KBUILD_DEFCONFIG may point out an alternative default configuration 758# used for 'make defconfig' 759include $(srctree)/arch/$(SRCARCH)/Makefile 760export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 761 762config: outputmakefile scripts_basic FORCE 763 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 764 765%config: outputmakefile scripts_basic FORCE 766 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 767 768else #!config-build 769# =========================================================================== 770# Build targets only - this includes vmlinux, arch-specific targets, clean 771# targets and others. In general all targets except *config targets. 772 773# If building an external module we do not care about the all: rule 774# but instead __all depend on modules 775PHONY += all 776ifeq ($(KBUILD_EXTMOD),) 777__all: all 778else 779__all: modules 780endif 781 782targets := 783 784# Decide whether to build built-in, modular, or both. 785# Normally, just do built-in. 786 787KBUILD_MODULES := 788KBUILD_BUILTIN := y 789 790# If we have only "make modules", don't compile built-in objects. 791ifeq ($(MAKECMDGOALS),modules) 792 KBUILD_BUILTIN := 793endif 794 795# If we have "make <whatever> modules", compile modules 796# in addition to whatever we do anyway. 797# Just "make" or "make all" shall build modules as well 798 799ifneq ($(filter all modules nsdeps compile_commands.json clang-% sbom,$(MAKECMDGOALS)),) 800 KBUILD_MODULES := y 801endif 802 803ifeq ($(MAKECMDGOALS),) 804 KBUILD_MODULES := y 805endif 806 807export KBUILD_MODULES KBUILD_BUILTIN 808 809ifdef need-config 810include $(objtree)/include/config/auto.conf 811endif 812 813CC_FLAGS_DIALECT := -std=gnu11 814# Allow including a tagged struct or union anonymously in another struct/union. 815CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 816# Clang enables warnings about GNU and Microsoft extensions by default, disable 817# them because this is expected with the above options. 818ifdef CONFIG_CC_IS_CLANG 819CC_FLAGS_DIALECT += -Wno-gnu 820CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 821endif 822export CC_FLAGS_DIALECT 823KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 824 825ifeq ($(KBUILD_EXTMOD),) 826# Objects we will link into vmlinux / subdirs we need to visit 827core-y := 828drivers-y := 829libs-y := lib/ 830endif # KBUILD_EXTMOD 831 832# The all: target is the default when no target is given on the 833# command line. 834# This allow a user to issue only 'make' to build a kernel including modules 835# Defaults to vmlinux, but the arch makefile usually adds further targets 836all: vmlinux 837 838# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 839ifdef CONFIG_FUNCTION_TRACER 840 CC_FLAGS_FTRACE := -pg 841endif 842 843ifdef CONFIG_TRACEPOINTS 844# To check for unused tracepoints (tracepoints that are defined but never 845# called), run with: 846# 847# make UT=1 848# 849# Each unused tracepoints can take up to 5KB of memory in the running kernel. 850# It is best to remove any that are not used. 851# 852# This command line option will be removed when all current unused 853# tracepoints are removed. 854 855ifeq ("$(origin UT)", "command line") 856 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 857endif 858endif # CONFIG_TRACEPOINTS 859 860export WARN_ON_UNUSED_TRACEPOINTS 861 862# Per-version Rust flags. These are like `rust_common_flags`, but may 863# depend on the Rust compiler version (e.g. using `rustc-min-version`). 864# 865# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 866# include bitmasking and shift operations. However, because it generated 867# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 868# lint which is not enabled by default. 869rust_common_flags_per_version := \ 870 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 871 872rust_common_flags += $(rust_common_flags_per_version) 873KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 874KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 875 876include $(srctree)/arch/$(SRCARCH)/Makefile 877 878ifdef need-config 879ifdef may-sync-config 880# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 881# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 882# because some architectures define CROSS_COMPILE there. 883include include/config/auto.conf.cmd 884 885$(KCONFIG_CONFIG): 886 @echo >&2 '***' 887 @echo >&2 '*** Configuration file "$@" not found!' 888 @echo >&2 '***' 889 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 890 @echo >&2 '*** "make menuconfig" or "make xconfig").' 891 @echo >&2 '***' 892 @/bin/false 893 894# The actual configuration files used during the build are stored in 895# include/generated/ and include/config/. Update them if .config is newer than 896# include/config/auto.conf (which mirrors .config). 897# 898# This exploits the 'multi-target pattern rule' trick. 899# The syncconfig should be executed only once to make all the targets. 900# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 901# 902# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 903# so you cannot notice that Kconfig is waiting for the user input. 904%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 905 $(Q)$(kecho) " SYNC $@" 906 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 907else # !may-sync-config 908# External modules and some install targets need include/generated/autoconf.h 909# and include/config/auto.conf but do not care if they are up-to-date. 910# Use auto.conf to show the error message 911 912checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 913missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 914 915ifdef missing-configs 916PHONY += $(objtree)/include/config/auto.conf 917 918$(objtree)/include/config/auto.conf: 919 @echo >&2 '***' 920 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 921 @printf >&2 '*** - %s\n' $(missing-configs) 922 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 923 @echo >&2 '***' 924 @/bin/false 925endif 926 927endif # may-sync-config 928endif # need-config 929 930KBUILD_CFLAGS += -fno-delete-null-pointer-checks 931 932ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 933KBUILD_CFLAGS += -O2 934KBUILD_RUSTFLAGS += -Copt-level=2 935else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 936KBUILD_CFLAGS += -Os 937KBUILD_RUSTFLAGS += -Copt-level=s 938endif 939 940# Always set `debug-assertions` and `overflow-checks` because their default 941# depends on `opt-level` and `debug-assertions`, respectively. 942KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 943KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 944 945# Tell gcc to never replace conditional load with a non-conditional one 946ifdef CONFIG_CC_IS_GCC 947# gcc-10 renamed --param=allow-store-data-races=0 to 948# -fno-allow-store-data-races. 949KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 950KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 951endif 952 953ifdef CONFIG_READABLE_ASM 954# Disable optimizations that make assembler listings hard to read. 955# reorder blocks reorders the control in the function 956# ipa clone creates specialized cloned functions 957# partial inlining inlines only parts of functions 958KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 959endif 960 961stackp-flags-y := -fno-stack-protector 962stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 963stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 964 965KBUILD_CFLAGS += $(stackp-flags-y) 966 967ifdef CONFIG_FRAME_POINTER 968KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 969KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 970# Work around rustc bug on compilers without 971# https://github.com/rust-lang/rust/pull/156980. 972KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=frame-pointer:u32:2:max) 973else 974# Some targets (ARM with Thumb2, for example), can't be built with frame 975# pointers. For those, we don't have FUNCTION_TRACER automatically 976# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 977# incompatible with -fomit-frame-pointer with current GCC, so we don't use 978# -fomit-frame-pointer with FUNCTION_TRACER. 979# In the Rust target specification, "frame-pointer" is set explicitly 980# to "may-omit". 981ifndef CONFIG_FUNCTION_TRACER 982KBUILD_CFLAGS += -fomit-frame-pointer 983endif 984endif 985 986# Initialize all stack variables with a 0xAA pattern. 987ifdef CONFIG_INIT_STACK_ALL_PATTERN 988KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 989endif 990 991# Initialize all stack variables with a zero value. 992ifdef CONFIG_INIT_STACK_ALL_ZERO 993KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 994ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 995# https://github.com/llvm/llvm-project/issues/44842 996CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 997export CC_AUTO_VAR_INIT_ZERO_ENABLER 998KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 999endif 1000endif 1001 1002ifdef CONFIG_KMALLOC_PARTITION_TYPED 1003# KMALLOC_PARTITION_CACHES_NR + 1 1004KBUILD_CFLAGS += -falloc-token-max=16 1005endif 1006 1007ifdef CONFIG_CC_IS_CLANG 1008ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1009KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1010endif 1011endif 1012 1013# Explicitly clear padding bits during variable initialization 1014KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1015 1016# While VLAs have been removed, GCC produces unreachable stack probes 1017# for the randomize_kstack_offset feature. Disable it for all compilers. 1018KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1019 1020# Get details on warnings generated due to GCC value tracking. 1021KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1022 1023# Show inlining notes for __attribute__((warning/error)) call chains. 1024# GCC supports this unconditionally while Clang 23+ provides a flag. 1025KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1026 1027# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1028ifdef CONFIG_ZERO_CALL_USED_REGS 1029KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1030endif 1031 1032ifdef CONFIG_FUNCTION_TRACER 1033ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1034 CC_FLAGS_FTRACE += -mrecord-mcount 1035 ifdef CONFIG_HAVE_NOP_MCOUNT 1036 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1037 CC_FLAGS_FTRACE += -mnop-mcount 1038 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1039 endif 1040 endif 1041endif 1042ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1043 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1044 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1045 endif 1046endif 1047ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1048 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1049 BUILD_C_RECORDMCOUNT := y 1050 export BUILD_C_RECORDMCOUNT 1051 endif 1052endif 1053ifdef CONFIG_HAVE_FENTRY 1054 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1055 ifeq ($(call cc-option-yn, -mfentry),y) 1056 CC_FLAGS_FTRACE += -mfentry 1057 CC_FLAGS_USING += -DCC_USING_FENTRY 1058 endif 1059endif 1060export CC_FLAGS_FTRACE 1061KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1062KBUILD_AFLAGS += $(CC_FLAGS_USING) 1063endif 1064 1065# We trigger additional mismatches with less inlining 1066ifdef CONFIG_DEBUG_SECTION_MISMATCH 1067KBUILD_CFLAGS += -fno-inline-functions-called-once 1068endif 1069 1070# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1071ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1072KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1073KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1074LDFLAGS_vmlinux += --gc-sections 1075endif 1076 1077ifdef CONFIG_SHADOW_CALL_STACK 1078ifndef CONFIG_DYNAMIC_SCS 1079CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1080KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1081KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1082endif 1083export CC_FLAGS_SCS 1084endif 1085 1086ifdef CONFIG_LTO_CLANG 1087ifdef CONFIG_LTO_CLANG_FULL 1088CC_FLAGS_LTO := -flto 1089else 1090CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1091 1092# These LLVM options were initially added with only in-process ThinLTO 1093# support, so avoid distributed ThinLTO support for now. 1094ifdef CONFIG_LTO_CLANG_THIN 1095KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1096endif 1097endif 1098CC_FLAGS_LTO += -fvisibility=hidden 1099 1100# Limit inlining across translation units to reduce binary size 1101KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1102endif 1103 1104ifdef CONFIG_LTO 1105KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1106KBUILD_AFLAGS += -fno-lto 1107export CC_FLAGS_LTO 1108endif 1109 1110ifdef CONFIG_CFI 1111CC_FLAGS_CFI := -fsanitize=kcfi 1112ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1113 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1114endif 1115ifdef CONFIG_FINEIBT_BHI 1116 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1117endif 1118ifdef CONFIG_RUST 1119 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1120 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1121 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1122 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1123 export RUSTC_FLAGS_CFI 1124endif 1125KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1126export CC_FLAGS_CFI 1127endif 1128 1129# Architectures can define flags to add/remove for floating-point support 1130CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1131export CC_FLAGS_FPU 1132export CC_FLAGS_NO_FPU 1133 1134ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1135# Set the minimal function alignment. Use the newer GCC option 1136# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1137# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1138ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1139KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1140else 1141KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1142endif 1143endif 1144 1145# arch Makefile may override CC so keep this after arch Makefile is included 1146NOSTDINC_FLAGS += -nostdinc 1147 1148# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1149# the kernel uses only C99 flexible arrays for dynamically sized trailing 1150# arrays. Enforce this for everything that may examine structure sizes and 1151# perform bounds checking. 1152KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1153 1154# disable invalid "can't wrap" optimizations for signed / pointers 1155KBUILD_CFLAGS += -fno-strict-overflow 1156 1157# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1158KBUILD_CFLAGS += -fno-stack-check 1159 1160# conserve stack if available 1161ifdef CONFIG_CC_IS_GCC 1162KBUILD_CFLAGS += -fconserve-stack 1163endif 1164 1165# Ensure compilers do not transform certain loops into calls to wcslen() 1166KBUILD_CFLAGS += -fno-builtin-wcslen 1167 1168CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1169ifdef CONFIG_CC_IS_GCC 1170CFLAGS_GCOV += -fno-tree-loop-im 1171# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1172# Only enable if -fprofile-update=prefer-atomic does not introduce new 1173# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1174CFLAGS_GCOV += $(call try-run,\ 1175 echo 'long long x; void f(void){x++;}' | \ 1176 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1177 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1178 echo 'long long x; void f(void){x++;}' | \ 1179 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1180 -ftest-coverage -fprofile-update=prefer-atomic \ 1181 -x c - -c -o "$$TMP" && \ 1182 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1183 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1184 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1185 -fprofile-update=prefer-atomic) 1186endif 1187export CFLAGS_GCOV 1188 1189# change __FILE__ to the relative path to the source directory 1190ifdef building_out_of_srctree 1191KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1192ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1193KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1194endif 1195endif 1196 1197# include additional Makefiles when needed 1198include-y := scripts/Makefile.warn 1199include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1200include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1201include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1202include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1203include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1204include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1205include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1206include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1207include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1208include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1209include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1210include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1211include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1212 1213include $(addprefix $(srctree)/, $(include-y)) 1214 1215# scripts/Makefile.gcc-plugins is intentionally included last. 1216# Do not add $(call cc-option,...) below this line. When you build the kernel 1217# from the clean source tree, the GCC plugins do not exist at this point. 1218 1219# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1220KBUILD_CPPFLAGS += $(KCPPFLAGS) 1221KBUILD_AFLAGS += $(KAFLAGS) 1222KBUILD_CFLAGS += $(KCFLAGS) 1223KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1224 1225KBUILD_LDFLAGS_MODULE += --build-id=sha1 1226LDFLAGS_vmlinux += --build-id=sha1 1227 1228KBUILD_LDFLAGS += -z noexecstack 1229ifeq ($(CONFIG_LD_IS_BFD),y) 1230KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1231endif 1232 1233ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1234LDFLAGS_vmlinux += -X 1235endif 1236 1237ifeq ($(CONFIG_RELR),y) 1238# ld.lld before 15 did not support -z pack-relative-relocs. 1239LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1240endif 1241 1242# We never want expected sections to be placed heuristically by the 1243# linker. All sections should be explicitly named in the linker script. 1244ifdef CONFIG_LD_ORPHAN_WARN 1245LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1246endif 1247 1248ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1249LDFLAGS_vmlinux += --emit-relocs --discard-none 1250endif 1251 1252# Align the architecture of userspace programs with the kernel 1253USERFLAGS_FROM_KERNEL := --target=% 1254 1255ifdef CONFIG_ARCH_USERFLAGS 1256KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1257KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1258else 1259# If not overridden also inherit the bit size 1260USERFLAGS_FROM_KERNEL += -m32 -m64 1261endif 1262 1263KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1264KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1265 1266# userspace programs are linked via the compiler, use the correct linker 1267ifdef CONFIG_CC_IS_CLANG 1268KBUILD_USERLDFLAGS += --ld-path=$(LD) 1269endif 1270 1271# make the checker run with the right architecture 1272CHECKFLAGS += --arch=$(ARCH) 1273 1274# insure the checker run with the right endianness 1275CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1276 1277# the checker needs the correct machine size 1278CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1279 1280# Validate the checker is available and functional 1281ifneq ($(KBUILD_CHECKSRC), 0) 1282 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1283 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1284 KBUILD_CHECKSRC = 0 1285 endif 1286endif 1287 1288# Default kernel image to build when no specific target is given. 1289# KBUILD_IMAGE may be overruled on the command line or 1290# set in the environment 1291# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1292# this default value 1293export KBUILD_IMAGE ?= vmlinux 1294 1295# 1296# INSTALL_PATH specifies where to place the updated kernel and system map 1297# images. Default is /boot, but you can set it to other values 1298export INSTALL_PATH ?= /boot 1299 1300# 1301# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1302# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1303# an argument if needed. Otherwise it defaults to the kernel install path 1304# 1305export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1306 1307# 1308# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1309# relocations required by build roots. This is not defined in the 1310# makefile but the argument can be passed to make if needed. 1311# 1312 1313MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1314export MODLIB 1315 1316PHONY += prepare0 1317 1318ifeq ($(KBUILD_EXTMOD),) 1319 1320build-dir := . 1321clean-dirs := $(sort . Documentation \ 1322 $(patsubst %/,%,$(filter %/, $(core-) \ 1323 $(drivers-) $(libs-)))) 1324 1325export ARCH_CORE := $(core-y) 1326export ARCH_LIB := $(filter %/, $(libs-y)) 1327export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1328# Externally visible symbols (used by link-vmlinux.sh) 1329 1330KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1331KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1332 1333export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1334export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1335 1336ifdef CONFIG_TRIM_UNUSED_KSYMS 1337# For the kernel to actually contain only the needed exported symbols, 1338# we have to build modules as well to determine what those symbols are. 1339KBUILD_MODULES := y 1340endif 1341 1342PHONY += vmlinux_a 1343vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1344 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1345 1346vmlinux.a: vmlinux_a 1347 @: 1348 1349PHONY += vmlinux_o 1350vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1351 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1352 1353vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1354 @: 1355 1356PHONY += vmlinux 1357# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1358# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1359# unrelated; the decompressors just happen to have the same base name, 1360# arch/*/boot/compressed/vmlinux. 1361# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1362# 1363# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1364# https://savannah.gnu.org/bugs/?61463 1365# For Make > 4.4, the following simple code will work: 1366# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1367vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1368vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1369vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1370 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1371 1372# The actual objects are generated when descending, 1373# make sure no implicit rule kicks in 1374$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1375 1376ifeq ($(origin KERNELRELEASE),file) 1377filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1378else 1379filechk_kernel.release = echo $(KERNELRELEASE) 1380endif 1381 1382# Store (new) KERNELRELEASE string in include/config/kernel.release 1383include/config/kernel.release: FORCE 1384 $(call filechk,kernel.release) 1385 1386# Additional helpers built in scripts/ 1387# Carefully list dependencies so we do not try to build scripts twice 1388# in parallel 1389PHONY += scripts 1390scripts: scripts_basic scripts_dtc 1391 $(Q)$(MAKE) $(build)=$(@) 1392 1393# Things we need to do before we recursively start building the kernel 1394# or the modules are listed in "prepare". 1395# A multi level approach is used. prepareN is processed before prepareN-1. 1396# archprepare is used in arch Makefiles and when processed asm symlink, 1397# version.h and scripts_basic is processed / created. 1398 1399PHONY += prepare archprepare 1400 1401archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1402 asm-generic $(version_h) include/generated/utsrelease.h \ 1403 include/generated/compile.h include/generated/autoconf.h \ 1404 include/generated/rustc_cfg remove-stale-files 1405 1406prepare0: archprepare 1407 $(Q)$(MAKE) $(build)=scripts/mod 1408 $(Q)$(MAKE) $(build)=. prepare 1409 1410# All the preparing.. 1411prepare: prepare0 1412ifdef CONFIG_RUST 1413 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1414 $(Q)$(MAKE) $(build)=rust 1415endif 1416 1417PHONY += remove-stale-files 1418remove-stale-files: 1419 $(Q)$(srctree)/scripts/remove-stale-files 1420 1421# Support for using generic headers in asm-generic 1422asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1423 1424PHONY += asm-generic uapi-asm-generic 1425asm-generic: uapi-asm-generic 1426 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1427 generic=include/asm-generic 1428uapi-asm-generic: 1429 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1430 generic=include/uapi/asm-generic 1431 1432# Generate some files 1433# --------------------------------------------------------------------------- 1434 1435# KERNELRELEASE can change from a few different places, meaning version.h 1436# needs to be updated, so this check is forced on all builds 1437 1438uts_len := 64 1439define filechk_utsrelease.h 1440 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1441 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1442 exit 1; \ 1443 fi; \ 1444 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1445endef 1446 1447define filechk_version.h 1448 if [ $(SUBLEVEL) -gt 255 ]; then \ 1449 echo \#define LINUX_VERSION_CODE $(shell \ 1450 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1451 else \ 1452 echo \#define LINUX_VERSION_CODE $(shell \ 1453 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1454 fi; \ 1455 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1456 ((c) > 255 ? 255 : (c)))'; \ 1457 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1458 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1459 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1460endef 1461 1462$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1463$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1464$(version_h): FORCE 1465 $(call filechk,version.h) 1466 1467include/generated/utsrelease.h: include/config/kernel.release FORCE 1468 $(call filechk,utsrelease.h) 1469 1470filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1471 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1472 1473include/generated/compile.h: FORCE 1474 $(call filechk,compile.h) 1475 1476PHONY += headerdep 1477headerdep: 1478 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1479 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1480 1481# --------------------------------------------------------------------------- 1482# Kernel headers 1483 1484#Default location for installed headers 1485export INSTALL_HDR_PATH = $(objtree)/usr 1486 1487quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1488 cmd_headers_install = \ 1489 mkdir -p $(INSTALL_HDR_PATH); \ 1490 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1491 usr/include $(INSTALL_HDR_PATH) 1492 1493PHONY += headers_install 1494headers_install: headers 1495 $(call cmd,headers_install) 1496 1497PHONY += archheaders archscripts 1498 1499hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1500 1501PHONY += headers 1502headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1503ifdef HEADER_ARCH 1504 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1505else 1506 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1507 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1508endif 1509 1510ifdef CONFIG_HEADERS_INSTALL 1511prepare: headers 1512endif 1513 1514PHONY += usr_gen_init_cpio 1515usr_gen_init_cpio: scripts_basic 1516 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1517 1518PHONY += scripts_unifdef 1519scripts_unifdef: scripts_basic 1520 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1521 1522PHONY += scripts_gen_packed_field_checks 1523scripts_gen_packed_field_checks: scripts_basic 1524 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1525 1526# --------------------------------------------------------------------------- 1527# Install 1528 1529# Many distributions have the custom install script, /sbin/installkernel. 1530# If DKMS is installed, 'make install' will eventually recurse back 1531# to this Makefile to build and install external modules. 1532# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1533 1534quiet_cmd_install = INSTALL $(INSTALL_PATH) 1535 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1536 1537# --------------------------------------------------------------------------- 1538# vDSO install 1539 1540PHONY += vdso_install 1541vdso_install: export INSTALL_FILES = $(vdso-install-y) 1542vdso_install: 1543 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1544 1545# --------------------------------------------------------------------------- 1546# Tools 1547 1548ifdef CONFIG_OBJTOOL 1549prepare: tools/objtool 1550endif 1551 1552ifdef CONFIG_BPF 1553ifdef CONFIG_DEBUG_INFO_BTF 1554prepare: tools/bpf/resolve_btfids 1555endif 1556endif 1557 1558# The tools build system is not a part of Kbuild and tends to introduce 1559# its own unique issues. If you need to integrate a new tool into Kbuild, 1560# please consider locating that tool outside the tools/ tree and using the 1561# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1562# here. See Documentation/kbuild/makefiles.rst for details. 1563 1564PHONY += resolve_btfids_clean 1565 1566resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1567 1568# tools/bpf/resolve_btfids directory might not exist 1569# in output directory, skip its clean in that case 1570resolve_btfids_clean: 1571ifneq ($(wildcard $(resolve_btfids_O)),) 1572 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1573endif 1574 1575PHONY += objtool_clean objtool_mrproper 1576 1577objtool_O = $(abspath $(objtree))/tools/objtool 1578 1579objtool_clean objtool_mrproper: 1580ifneq ($(wildcard $(objtool_O)),) 1581 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1582endif 1583 1584tools/: FORCE 1585 $(Q)mkdir -p $(objtree)/tools 1586 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1587 1588tools/%: FORCE 1589 $(Q)mkdir -p $(objtree)/tools 1590 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1591 1592# --------------------------------------------------------------------------- 1593# Kernel selftest 1594 1595PHONY += kselftest 1596kselftest: headers 1597 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1598 1599kselftest-%: headers FORCE 1600 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1601 1602PHONY += kselftest-merge 1603kselftest-merge: 1604 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1605 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1606 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1607 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1608 1609# --------------------------------------------------------------------------- 1610# Devicetree files 1611 1612ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1613dtstree := arch/$(SRCARCH)/boot/dts 1614endif 1615 1616dtbindingtree := Documentation/devicetree/bindings 1617 1618%.yaml: dtbs_prepare 1619 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1620 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1621 1622ifneq ($(dtstree),) 1623 1624%.dtb: dtbs_prepare 1625 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1626 1627%.dtbo: dtbs_prepare 1628 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1629 1630PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1631dtbs: dtbs_prepare 1632 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1633 1634# include/config/kernel.release is actually needed when installing DTBs because 1635# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1636# dtbs_install depend on it as dtbs_install may run as root. 1637dtbs_prepare: include/config/kernel.release scripts_dtc 1638 1639ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1640export CHECK_DTBS=y 1641endif 1642 1643ifneq ($(CHECK_DTBS),) 1644dtbs_prepare: dt_binding_schemas 1645endif 1646 1647dtbs_check: dtbs 1648 1649dtbs_install: 1650 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1651 1652ifdef CONFIG_OF_EARLY_FLATTREE 1653all: dtbs 1654endif 1655 1656ifdef CONFIG_GENERIC_BUILTIN_DTB 1657vmlinux: dtbs 1658endif 1659 1660endif 1661 1662PHONY += scripts_dtc 1663scripts_dtc: scripts_basic 1664 $(Q)$(MAKE) $(build)=scripts/dtc 1665 1666ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1667export CHECK_DTBS=y 1668endif 1669 1670PHONY += dt_binding_check dt_binding_schemas 1671dt_binding_check: dt_binding_schemas scripts_dtc 1672 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1673 1674dt_binding_schemas: 1675 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1676 1677PHONY += dt_compatible_check 1678dt_compatible_check: dt_binding_schemas 1679 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1680 1681PHONY += dt_style_selftest 1682dt_style_selftest: 1683 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1684 1685# --------------------------------------------------------------------------- 1686# Modules 1687 1688ifdef CONFIG_MODULES 1689 1690# By default, build modules as well 1691 1692all: modules 1693 1694# When we're building modules with modversions, we need to consider 1695# the built-in objects during the descend as well, in order to 1696# make sure the checksums are up to date before we record them. 1697ifdef CONFIG_MODVERSIONS 1698 KBUILD_BUILTIN := y 1699endif 1700 1701# Build modules 1702# 1703 1704# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1705# is an exception. 1706ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1707KBUILD_BUILTIN := y 1708modules: vmlinux 1709endif 1710 1711modules: modules_prepare 1712 1713# Target to prepare building external modules 1714modules_prepare: prepare 1715 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1716 1717endif # CONFIG_MODULES 1718 1719### 1720# Cleaning is done on three levels. 1721# make clean Delete most generated files 1722# Leave enough to build external modules 1723# make mrproper Delete the current configuration, and all generated files 1724# make distclean Remove editor backup files, patch leftover files and the like 1725 1726# Directories & files removed with 'make clean' 1727CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1728 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1729 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1730 vmlinux.thinlto-index builtin.order \ 1731 compile_commands.json rust/test \ 1732 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1733 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1734 1735# Directories & files removed with 'make mrproper' 1736MRPROPER_FILES += include/config include/generated \ 1737 arch/$(SRCARCH)/include/generated .objdiff \ 1738 debian snap tar-install PKGBUILD pacman \ 1739 .config .config.old .version \ 1740 Module.symvers \ 1741 certs/signing_key.pem \ 1742 certs/x509.genkey \ 1743 vmlinux-gdb.py \ 1744 rpmbuild \ 1745 rust/libmacros.so rust/libmacros.dylib \ 1746 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1747 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1748 1749# clean - Delete most, but leave enough to build external modules 1750# 1751clean: private rm-files := $(CLEAN_FILES) 1752 1753PHONY += archclean vmlinuxclean 1754 1755vmlinuxclean: 1756 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1757 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1758 1759clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1760 1761# mrproper - Delete all generated files, including .config 1762# 1763mrproper: private rm-files := $(MRPROPER_FILES) 1764mrproper-dirs := $(addprefix _mrproper_,scripts) 1765 1766PHONY += $(mrproper-dirs) mrproper 1767$(mrproper-dirs): 1768 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1769 1770mrproper: clean objtool_mrproper $(mrproper-dirs) 1771 $(call cmd,rmfiles) 1772 @find . $(RCS_FIND_IGNORE) \ 1773 \( -name '*.rmeta' \) \ 1774 -type f -print | xargs rm -f 1775 1776# distclean 1777# 1778PHONY += distclean 1779 1780distclean: mrproper 1781 @find . $(RCS_FIND_IGNORE) \ 1782 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1783 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1784 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1785 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1786 -type f -print | xargs rm -f 1787 1788 1789# Packaging of the kernel to various formats 1790# --------------------------------------------------------------------------- 1791 1792modules-cpio-pkg: usr_gen_init_cpio 1793 1794%src-pkg: FORCE 1795 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1796%pkg: include/config/kernel.release FORCE 1797 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1798 1799# Brief documentation of the typical targets used 1800# --------------------------------------------------------------------------- 1801 1802boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1803boards := $(sort $(notdir $(boards))) 1804board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1805board-dirs := $(sort $(notdir $(board-dirs:/=))) 1806 1807PHONY += help 1808help: 1809 @echo 'Cleaning targets:' 1810 @echo ' clean - Remove most generated files but keep the config and' 1811 @echo ' enough build support to build external modules' 1812 @echo ' mrproper - Remove all generated files + config + various backup files' 1813 @echo ' distclean - mrproper + remove editor backup and patch files' 1814 @echo '' 1815 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1816 @echo '' 1817 @echo 'Other generic targets:' 1818 @echo ' all - Build all targets marked with [*]' 1819 @echo '* vmlinux - Build the bare kernel' 1820 @echo '* modules - Build all modules' 1821 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1822 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1823 @echo ' dir/ - Build all files in dir and below' 1824 @echo ' dir/file.[ois] - Build specified target only' 1825 @echo ' dir/file.ll - Build the LLVM assembly file' 1826 @echo ' (requires compiler support for LLVM assembly generation)' 1827 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1828 @echo ' (requires a recent binutils and recent build (System.map))' 1829 @echo ' dir/file.ko - Build module including final link' 1830 @echo ' modules_prepare - Set up for building external modules' 1831 @echo ' tags/TAGS - Generate tags file for editors' 1832 @echo ' cscope - Generate cscope index' 1833 @echo ' gtags - Generate GNU GLOBAL index' 1834 @echo ' kernelrelease - Output the release version string (use with make -s)' 1835 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1836 @echo ' image_name - Output the image name (use with make -s)' 1837 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1838 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1839 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1840 echo '' 1841 @echo 'Static analysers:' 1842 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1843 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1844 @echo ' versioncheck - Sanity check on version.h usage' 1845 @echo ' includecheck - Check for duplicate included header files' 1846 @echo ' headerdep - Detect inclusion cycles in headers' 1847 @echo ' coccicheck - Check with Coccinelle' 1848 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1849 @echo ' clang-analyzer - Check with clang static analyzer' 1850 @echo ' clang-tidy - Check with clang-tidy' 1851 @echo '' 1852 @echo 'Tools:' 1853 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1854 @echo ' sbom - Generate Software Bill of Materials' 1855 @echo '' 1856 @echo 'Kernel selftest:' 1857 @echo ' kselftest - Build and run kernel selftest' 1858 @echo ' Build, install, and boot kernel before' 1859 @echo ' running kselftest on it' 1860 @echo ' Run as root for full coverage' 1861 @echo ' kselftest-all - Build kernel selftest' 1862 @echo ' kselftest-install - Build and install kernel selftest' 1863 @echo ' kselftest-clean - Remove all generated kselftest files' 1864 @echo ' kselftest-merge - Merge all the config dependencies of' 1865 @echo ' kselftest to existing .config.' 1866 @echo '' 1867 @echo 'Rust targets:' 1868 @echo ' rustavailable - Checks whether the Rust toolchain is' 1869 @echo ' available and, if not, explains why.' 1870 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1871 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1872 @echo ' is formatted, printing a diff otherwise.' 1873 @echo ' rustdoc - Generate Rust documentation' 1874 @echo ' (requires kernel .config)' 1875 @echo ' rusttest - Runs the Rust tests' 1876 @echo ' (requires kernel .config; downloads external repos)' 1877 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1878 @echo ' (requires kernel .config)' 1879 @echo ' dir/file.[os] - Build specified target only' 1880 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1881 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1882 @echo ' The output is not intended to be compilable.' 1883 @echo ' dir/file.ll - Build the LLVM assembly file' 1884 @echo '' 1885 @$(if $(dtstree), \ 1886 echo 'Devicetree:'; \ 1887 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1888 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1889 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1890 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1891 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1892 echo ' dtbs_check - Validate device tree source files';\ 1893 echo '') 1894 1895 @echo 'Userspace tools targets:' 1896 @echo ' use "make tools/help"' 1897 @echo ' or "cd tools; make help"' 1898 @echo '' 1899 @echo 'Kernel packaging:' 1900 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1901 @echo '' 1902 @echo 'Documentation targets:' 1903 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1904 @echo '' 1905 @echo 'Architecture-specific targets ($(SRCARCH)):' 1906 @$(or $(archhelp),\ 1907 echo ' No architecture-specific help defined for $(SRCARCH)') 1908 @echo '' 1909 @$(if $(boards), \ 1910 $(foreach b, $(boards), \ 1911 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1912 echo '') 1913 @$(if $(board-dirs), \ 1914 $(foreach b, $(board-dirs), \ 1915 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1916 printf " %-16s - Show all of the above\\n" help-boards; \ 1917 echo '') 1918 1919 @echo ' make V=n [targets] 1: verbose build' 1920 @echo ' 2: give reason for rebuild of target' 1921 @echo ' V=1 and V=2 can be combined with V=12' 1922 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1923 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1924 @echo ' (sparse by default)' 1925 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1926 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1927 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1928 @echo ' 1: warnings which may be relevant and do not occur too often' 1929 @echo ' 2: warnings which occur quite often but may still be relevant' 1930 @echo ' 3: more obscure warnings, can most likely be ignored' 1931 @echo ' c: extra checks in the configuration stage (Kconfig)' 1932 @echo ' e: warnings are being treated as errors' 1933 @echo ' Multiple levels can be combined with W=12 or W=123' 1934 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1935 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1936 @$(if $(dtstree), \ 1937 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1938 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1939 ) 1940 @echo '' 1941 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1942 @echo 'For further info see the ./README file' 1943 1944 1945help-board-dirs := $(addprefix help-,$(board-dirs)) 1946 1947help-boards: $(help-board-dirs) 1948 1949boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1950 1951$(help-board-dirs): help-%: 1952 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1953 @$(if $(boards-per-dir), \ 1954 $(foreach b, $(boards-per-dir), \ 1955 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1956 echo '') 1957 1958 1959# Documentation targets 1960# --------------------------------------------------------------------------- 1961DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1962 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1963 htmldocs-redirects 1964 1965PHONY += $(DOC_TARGETS) 1966$(DOC_TARGETS): 1967 $(Q)$(MAKE) $(build)=Documentation $@ 1968 1969 1970# Rust targets 1971# --------------------------------------------------------------------------- 1972 1973# "Is Rust available?" target 1974PHONY += rustavailable 1975rustavailable: 1976 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1977 1978# Documentation target 1979# 1980# Using the singular to avoid running afoul of `no-dot-config-targets`. 1981PHONY += rustdoc 1982rustdoc: prepare 1983 $(Q)$(MAKE) $(build)=rust $@ 1984 1985# Testing target 1986PHONY += rusttest 1987rusttest: prepare 1988 $(Q)$(MAKE) $(build)=rust $@ 1989 1990# Formatting targets 1991# 1992# Generated files as well as vendored crates are skipped. 1993PHONY += rustfmt rustfmtcheck 1994 1995rustfmt: 1996 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1997 \( \ 1998 -path $(srctree)/rust/proc-macro2 \ 1999 -o -path $(srctree)/rust/quote \ 2000 -o -path $(srctree)/rust/syn \ 2001 -o -path $(srctree)/rust/zerocopy \ 2002 -o -path $(srctree)/rust/zerocopy-derive \ 2003 \) -prune -o \ 2004 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2005 | xargs $(RUSTFMT) $(rustfmt_flags) 2006 2007rustfmtcheck: rustfmt_flags = --check 2008rustfmtcheck: rustfmt 2009 2010# Misc 2011# --------------------------------------------------------------------------- 2012 2013PHONY += misc-check 2014misc-check: 2015 $(Q)$(srctree)/scripts/misc-check 2016 2017all: misc-check 2018 2019PHONY += scripts_gdb 2020scripts_gdb: prepare0 2021 $(Q)$(MAKE) $(build)=scripts/gdb 2022 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2023 2024ifdef CONFIG_GDB_SCRIPTS 2025all: scripts_gdb 2026endif 2027 2028else # KBUILD_EXTMOD 2029 2030filechk_kernel.release = echo $(KERNELRELEASE) 2031 2032### 2033# External module support. 2034# When building external modules the kernel used as basis is considered 2035# read-only, and no consistency checks are made and the make 2036# system is not used on the basis kernel. If updates are required 2037# in the basis kernel ordinary make commands (without M=...) must be used. 2038 2039# We are always building only modules. 2040KBUILD_BUILTIN := 2041KBUILD_MODULES := y 2042 2043build-dir := . 2044 2045clean-dirs := . 2046clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2047 2048PHONY += prepare 2049# now expand this into a simple variable to reduce the cost of shell evaluations 2050prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2051prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2052prepare: 2053 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2054 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2055 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2056 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2057 fi 2058 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2059 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2060 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2061 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2062 fi 2063 2064PHONY += help 2065help: 2066 @echo ' Building external modules.' 2067 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2068 @echo '' 2069 @echo ' modules - default target, build the module(s)' 2070 @echo ' modules_install - install the module' 2071 @echo ' clean - remove generated files in module directory only' 2072 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2073 @echo '' 2074 2075ifndef CONFIG_MODULES 2076modules modules_install: __external_modules_error 2077__external_modules_error: 2078 @echo >&2 '***' 2079 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2080 @echo >&2 '*** You cannot build or install external modules.' 2081 @echo >&2 '***' 2082 @false 2083endif 2084 2085endif # KBUILD_EXTMOD 2086 2087# --------------------------------------------------------------------------- 2088# Modules 2089 2090PHONY += modules modules_install modules_sign modules_prepare 2091 2092modules_install: 2093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2094 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2095 2096ifeq ($(CONFIG_MODULE_SIG),y) 2097# modules_sign is a subset of modules_install. 2098# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2099modules_sign: modules_install 2100 @: 2101else 2102modules_sign: 2103 @echo >&2 '***' 2104 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2105 @echo >&2 '***' 2106 @false 2107endif 2108 2109ifdef CONFIG_MODULES 2110 2111modules.order: $(build-dir) 2112 @: 2113 2114# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2115# This is solely useful to speed up test compiles. 2116modules: modpost 2117ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2118 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2119endif 2120 2121PHONY += modules_check 2122modules_check: modules.order 2123 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2124 2125else # CONFIG_MODULES 2126 2127modules: 2128 @: 2129 2130KBUILD_MODULES := 2131 2132endif # CONFIG_MODULES 2133 2134PHONY += modpost 2135modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2136 $(if $(KBUILD_MODULES), modules_check) 2137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2138 2139# Single targets 2140# --------------------------------------------------------------------------- 2141# To build individual files in subdirectories, you can do like this: 2142# 2143# make foo/bar/baz.s 2144# 2145# The supported suffixes for single-target are listed in 'single-targets' 2146# 2147# To build only under specific subdirectories, you can do like this: 2148# 2149# make foo/bar/baz/ 2150 2151ifdef single-build 2152 2153# .ko is special because modpost is needed 2154single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2155single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2156 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2157 2158$(single-ko): single_modules 2159 @: 2160$(single-no-ko): $(build-dir) 2161 @: 2162 2163# Remove modules.order when done because it is not the real one. 2164PHONY += single_modules 2165single_modules: $(single-no-ko) modules_prepare 2166 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2167 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2168ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2170endif 2171 $(Q)rm -f modules.order 2172 2173single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2174 2175KBUILD_MODULES := y 2176 2177endif 2178 2179prepare: outputmakefile 2180 2181# Preset locale variables to speed up the build process. Limit locale 2182# tweaks to this spot to avoid wrong language settings when running 2183# make menuconfig etc. 2184# Error messages still appears in the original language 2185PHONY += $(build-dir) 2186$(build-dir): prepare 2187 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2188 2189clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2190PHONY += $(clean-dirs) clean 2191$(clean-dirs): 2192 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2193 2194clean: $(clean-dirs) 2195 $(call cmd,rmfiles) 2196 @find . $(RCS_FIND_IGNORE) \ 2197 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2198 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2199 -o -name '*.dtb' -o -name '*.dtbo' \ 2200 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2201 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2202 -o -name '*.dwo' -o -name '*.lst' \ 2203 -o -name '*.su' -o -name '*.mod' \ 2204 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2205 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2206 -o -name '*.asn1.[ch]' \ 2207 -o -name '*.symtypes' -o -name 'modules.order' \ 2208 -o -name '*.c.[012]*.*' \ 2209 -o -name '*.ll' \ 2210 -o -name '*.gcno' \ 2211 -o -name '*.long-type-*.txt' \ 2212 \) -type f -print \ 2213 -o -name '.tmp_*' -print \ 2214 | xargs rm -rf 2215 2216# Generate tags for editors 2217# --------------------------------------------------------------------------- 2218quiet_cmd_tags = GEN $@ 2219 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2220 2221tags TAGS cscope gtags: FORCE 2222 $(call cmd,tags) 2223 2224# Generate rust-project.json (a file that describes the structure of non-Cargo 2225# Rust projects) for rust-analyzer (an implementation of the Language Server 2226# Protocol). 2227PHONY += rust-analyzer 2228rust-analyzer: 2229 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2230ifdef KBUILD_EXTMOD 2231# FIXME: external modules must not descend into a sub-directory of the kernel 2232 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2233else 2234 $(Q)$(MAKE) $(build)=rust $@ 2235endif 2236 2237# Script to generate missing namespace dependencies 2238# --------------------------------------------------------------------------- 2239 2240PHONY += nsdeps 2241nsdeps: export KBUILD_NSDEPS=1 2242nsdeps: modules 2243 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2244 2245# Script to generate .spdx.json SBOM documents describing the build 2246# --------------------------------------------------------------------------- 2247 2248ifdef building_out_of_srctree 2249sbom_targets := sbom-source.spdx.json 2250endif 2251sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2252quiet_cmd_sbom = GEN $(sbom_targets) 2253 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2254 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2255 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2256 --src-tree $(abspath $(srctree)) \ 2257 --obj-tree $(abspath $(objtree)) \ 2258 --roots-file "$(tmp-target)" \ 2259 --output-directory $(abspath $(objtree)) \ 2260 --generate-spdx \ 2261 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2262 --package-version "$(KERNELVERSION)" \ 2263 --write-output-on-error; 2264PHONY += sbom 2265sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2266 $(call cmd,sbom) 2267 2268# Clang Tooling 2269# --------------------------------------------------------------------------- 2270 2271quiet_cmd_gen_compile_commands = GEN $@ 2272 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2273 2274compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2275 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2276 $(if $(CONFIG_MODULES), modules.order) FORCE 2277 $(call if_changed,gen_compile_commands) 2278 2279targets += compile_commands.json 2280 2281PHONY += clang-tidy clang-analyzer 2282 2283ifdef CONFIG_CC_IS_CLANG 2284quiet_cmd_clang_tools = CHECK $< 2285 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2286 2287clang-tidy clang-analyzer: compile_commands.json 2288 $(call cmd,clang_tools) 2289else 2290clang-tidy clang-analyzer: 2291 @echo "$@ requires CC=clang" >&2 2292 @false 2293endif 2294 2295# Scripts to check various things for consistency 2296# --------------------------------------------------------------------------- 2297 2298PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2299 2300includecheck: 2301 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2302 -name '*.[hcS]' -type f -print | sort \ 2303 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2304 2305versioncheck: 2306 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2307 -name '*.[hcS]' -type f -print | sort \ 2308 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2309 2310coccicheck: 2311 $(Q)$(BASH) $(srctree)/scripts/$@ 2312 2313kconfig-sym-check: 2314 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2315 2316PHONY += checkstack kernelrelease kernelversion image_name 2317 2318# UML needs a little special treatment here. It wants to use the host 2319# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2320# else wants $(ARCH), including people doing cross-builds, which means 2321# that $(SUBARCH) doesn't work here. 2322ifeq ($(ARCH), um) 2323CHECKSTACK_ARCH := $(SUBARCH) 2324else 2325CHECKSTACK_ARCH := $(ARCH) 2326endif 2327MINSTACKSIZE ?= 100 2328checkstack: 2329 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2330 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2331 2332kernelrelease: 2333 @$(filechk_kernel.release) 2334 2335kernelversion: 2336 @echo $(KERNELVERSION) 2337 2338image_name: 2339 @echo $(KBUILD_IMAGE) 2340 2341PHONY += run-command 2342run-command: 2343 $(Q)$(KBUILD_RUN_COMMAND) 2344 2345quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2346 cmd_rmfiles = rm -rf $(rm-files) 2347 2348# read saved command lines for existing targets 2349existing-targets := $(wildcard $(sort $(targets))) 2350 2351-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2352 2353endif # config-build 2354endif # mixed-build 2355endif # need-sub-make 2356 2357PHONY += FORCE 2358FORCE: 2359 2360# Declare the contents of the PHONY variable as phony. We keep that 2361# information in a variable so we can use it in if_changed and friends. 2362.PHONY: $(PHONY) 2363