1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 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_RUST_INLINE_HELPERS 1087# `rustc` normally emits traps for unreachable paths during code generation. 1088# With inline helpers, Clang performs code generation from the linked bitcode 1089# instead, so request the same behavior explicitly. Otherwise `objtool` may 1090# follow an impossible Rust path into the next function. 1091CC_FLAGS_RUST_INLINE_HELPERS := -mllvm -trap-unreachable \ 1092 -mllvm -no-trap-after-noreturn 1093export CC_FLAGS_RUST_INLINE_HELPERS 1094endif 1095 1096ifdef CONFIG_LTO_CLANG 1097ifdef CONFIG_LTO_CLANG_FULL 1098CC_FLAGS_LTO := -flto 1099else 1100CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1101 1102# These LLVM options were initially added with only in-process ThinLTO 1103# support, so avoid distributed ThinLTO support for now. 1104ifdef CONFIG_LTO_CLANG_THIN 1105KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1106endif 1107endif 1108CC_FLAGS_LTO += -fvisibility=hidden 1109 1110# Limit inlining across translation units to reduce binary size 1111KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1112endif 1113 1114ifdef CONFIG_LTO 1115KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1116KBUILD_AFLAGS += -fno-lto 1117export CC_FLAGS_LTO 1118endif 1119 1120ifdef CONFIG_CFI 1121CC_FLAGS_CFI := -fsanitize=kcfi 1122ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1123 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1124endif 1125ifdef CONFIG_FINEIBT_BHI 1126 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1127endif 1128ifdef CONFIG_RUST 1129 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1130 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1131 # Disable function merging as LLVM incorrectly merges functions with different KCFI types. 1132 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers -Zmerge-functions=disabled 1133 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1134 export RUSTC_FLAGS_CFI 1135endif 1136KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1137export CC_FLAGS_CFI 1138endif 1139 1140# Architectures can define flags to add/remove for floating-point support 1141CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1142export CC_FLAGS_FPU 1143export CC_FLAGS_NO_FPU 1144 1145ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1146# Set the minimal function alignment. Use the newer GCC option 1147# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1148# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1149ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1150KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1151else 1152KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1153endif 1154endif 1155 1156# arch Makefile may override CC so keep this after arch Makefile is included 1157NOSTDINC_FLAGS += -nostdinc 1158 1159# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1160# the kernel uses only C99 flexible arrays for dynamically sized trailing 1161# arrays. Enforce this for everything that may examine structure sizes and 1162# perform bounds checking. 1163KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1164 1165# disable invalid "can't wrap" optimizations for signed / pointers 1166KBUILD_CFLAGS += -fno-strict-overflow 1167 1168# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1169KBUILD_CFLAGS += -fno-stack-check 1170 1171# conserve stack if available 1172ifdef CONFIG_CC_IS_GCC 1173KBUILD_CFLAGS += -fconserve-stack 1174endif 1175 1176# Ensure compilers do not transform certain loops into calls to wcslen() 1177KBUILD_CFLAGS += -fno-builtin-wcslen 1178 1179CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1180ifdef CONFIG_CC_IS_GCC 1181CFLAGS_GCOV += -fno-tree-loop-im 1182# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1183# Only enable if -fprofile-update=prefer-atomic does not introduce new 1184# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1185CFLAGS_GCOV += $(call try-run,\ 1186 echo 'long long x; void f(void){x++;}' | \ 1187 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1188 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1189 echo 'long long x; void f(void){x++;}' | \ 1190 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1191 -ftest-coverage -fprofile-update=prefer-atomic \ 1192 -x c - -c -o "$$TMP" && \ 1193 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1194 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1195 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1196 -fprofile-update=prefer-atomic) 1197endif 1198export CFLAGS_GCOV 1199 1200# change __FILE__ to the relative path to the source directory 1201ifdef building_out_of_srctree 1202KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1203ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1204KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1205endif 1206endif 1207 1208# include additional Makefiles when needed 1209include-y := scripts/Makefile.warn 1210include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1211include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1212include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1213include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1214include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1215include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1216include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1217include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1218include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1219include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1220include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1221include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1222include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1223 1224include $(addprefix $(srctree)/, $(include-y)) 1225 1226# scripts/Makefile.gcc-plugins is intentionally included last. 1227# Do not add $(call cc-option,...) below this line. When you build the kernel 1228# from the clean source tree, the GCC plugins do not exist at this point. 1229 1230# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1231KBUILD_CPPFLAGS += $(KCPPFLAGS) 1232KBUILD_AFLAGS += $(KAFLAGS) 1233KBUILD_CFLAGS += $(KCFLAGS) 1234KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1235 1236KBUILD_LDFLAGS_MODULE += --build-id=sha1 1237LDFLAGS_vmlinux += --build-id=sha1 1238 1239# Specific code, such as outlined KASAN checks, may be placed in 1240# COMDAT-deduplicated sections. Use --force-group-allocation to resolve these 1241# groups when linking modules. The option is available from ld.bfd 2.29 and 1242# ld.lld 19.1.0. 1243KBUILD_LDFLAGS_MODULE += $(call ld-option,--force-group-allocation) 1244 1245KBUILD_LDFLAGS += -z noexecstack 1246ifeq ($(CONFIG_LD_IS_BFD),y) 1247KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1248endif 1249 1250ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1251LDFLAGS_vmlinux += -X 1252endif 1253 1254ifeq ($(CONFIG_RELR),y) 1255# ld.lld before 15 did not support -z pack-relative-relocs. 1256LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1257endif 1258 1259# We never want expected sections to be placed heuristically by the 1260# linker. All sections should be explicitly named in the linker script. 1261ifdef CONFIG_LD_ORPHAN_WARN 1262LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1263endif 1264 1265ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1266LDFLAGS_vmlinux += --emit-relocs --discard-none 1267endif 1268 1269# Align the architecture of userspace programs with the kernel 1270USERFLAGS_FROM_KERNEL := --target=% 1271 1272ifdef CONFIG_ARCH_USERFLAGS 1273KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1274KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1275else 1276# If not overridden also inherit the bit size 1277USERFLAGS_FROM_KERNEL += -m32 -m64 1278endif 1279 1280KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1281KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1282 1283# userspace programs are linked via the compiler, use the correct linker 1284ifdef CONFIG_CC_IS_CLANG 1285KBUILD_USERLDFLAGS += --ld-path=$(LD) 1286endif 1287 1288# make the checker run with the right architecture 1289CHECKFLAGS += --arch=$(ARCH) 1290 1291# insure the checker run with the right endianness 1292CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1293 1294# the checker needs the correct machine size 1295CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1296 1297# Validate the checker is available and functional 1298ifneq ($(KBUILD_CHECKSRC), 0) 1299 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1300 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1301 KBUILD_CHECKSRC = 0 1302 endif 1303endif 1304 1305# Default kernel image to build when no specific target is given. 1306# KBUILD_IMAGE may be overruled on the command line or 1307# set in the environment 1308# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1309# this default value 1310export KBUILD_IMAGE ?= vmlinux 1311 1312# 1313# INSTALL_PATH specifies where to place the updated kernel and system map 1314# images. Default is /boot, but you can set it to other values 1315export INSTALL_PATH ?= /boot 1316 1317# 1318# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1319# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1320# an argument if needed. Otherwise it defaults to the kernel install path 1321# 1322export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1323 1324# 1325# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1326# relocations required by build roots. This is not defined in the 1327# makefile but the argument can be passed to make if needed. 1328# 1329 1330MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1331export MODLIB 1332 1333PHONY += prepare0 1334 1335ifeq ($(KBUILD_EXTMOD),) 1336 1337build-dir := . 1338clean-dirs := $(sort . Documentation \ 1339 $(patsubst %/,%,$(filter %/, $(core-) \ 1340 $(drivers-) $(libs-)))) 1341 1342export ARCH_CORE := $(core-y) 1343export ARCH_LIB := $(filter %/, $(libs-y)) 1344export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1345# Externally visible symbols (used by link-vmlinux.sh) 1346 1347KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1348KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1349 1350export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1351export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1352 1353ifdef CONFIG_TRIM_UNUSED_KSYMS 1354# For the kernel to actually contain only the needed exported symbols, 1355# we have to build modules as well to determine what those symbols are. 1356KBUILD_MODULES := y 1357endif 1358 1359PHONY += vmlinux_a 1360vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1361 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1362 1363vmlinux.a: vmlinux_a 1364 @: 1365 1366PHONY += vmlinux_o 1367vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1368 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1369 1370vmlinux.o: vmlinux_o 1371 @: 1372 1373PHONY += vmlinux 1374# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1375# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1376# unrelated; the decompressors just happen to have the same base name, 1377# arch/*/boot/compressed/vmlinux. 1378# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1379# 1380# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1381# https://savannah.gnu.org/bugs/?61463 1382# For Make > 4.4, the following simple code will work: 1383# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1384vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1385vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1386vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1387 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1388 1389# The actual objects are generated when descending, 1390# make sure no implicit rule kicks in 1391$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1392 1393ifeq ($(origin KERNELRELEASE),file) 1394filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1395else 1396filechk_kernel.release = echo $(KERNELRELEASE) 1397endif 1398 1399# Store (new) KERNELRELEASE string in include/config/kernel.release 1400include/config/kernel.release: FORCE 1401 $(call filechk,kernel.release) 1402 1403# Additional helpers built in scripts/ 1404# Carefully list dependencies so we do not try to build scripts twice 1405# in parallel 1406PHONY += scripts 1407scripts: scripts_basic scripts_dtc 1408 $(Q)$(MAKE) $(build)=$(@) 1409 1410# Things we need to do before we recursively start building the kernel 1411# or the modules are listed in "prepare". 1412# A multi level approach is used. prepareN is processed before prepareN-1. 1413# archprepare is used in arch Makefiles and when processed asm symlink, 1414# version.h and scripts_basic is processed / created. 1415 1416PHONY += prepare archprepare 1417 1418archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1419 asm-generic $(version_h) include/generated/utsrelease.h \ 1420 include/generated/compile.h include/generated/autoconf.h \ 1421 include/generated/rustc_cfg remove-stale-files 1422 1423prepare0: archprepare 1424 $(Q)$(MAKE) $(build)=scripts/mod 1425 $(Q)$(MAKE) $(build)=. prepare 1426 1427# All the preparing.. 1428prepare: prepare0 1429ifdef CONFIG_RUST 1430 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1431 $(Q)$(MAKE) $(build)=rust 1432endif 1433 1434PHONY += remove-stale-files 1435remove-stale-files: 1436 $(Q)$(srctree)/scripts/remove-stale-files 1437 1438# Support for using generic headers in asm-generic 1439asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1440 1441PHONY += asm-generic uapi-asm-generic 1442asm-generic: uapi-asm-generic 1443 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1444 generic=include/asm-generic 1445uapi-asm-generic: 1446 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1447 generic=include/uapi/asm-generic 1448 1449# Generate some files 1450# --------------------------------------------------------------------------- 1451 1452# KERNELRELEASE can change from a few different places, meaning version.h 1453# needs to be updated, so this check is forced on all builds 1454 1455uts_len := 64 1456define filechk_utsrelease.h 1457 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1458 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1459 exit 1; \ 1460 fi; \ 1461 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1462endef 1463 1464define filechk_version.h 1465 if [ $(SUBLEVEL) -gt 255 ]; then \ 1466 echo \#define LINUX_VERSION_CODE $(shell \ 1467 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1468 else \ 1469 echo \#define LINUX_VERSION_CODE $(shell \ 1470 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1471 fi; \ 1472 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1473 ((c) > 255 ? 255 : (c)))'; \ 1474 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1475 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1476 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1477endef 1478 1479$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1480$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1481$(version_h): FORCE 1482 $(call filechk,version.h) 1483 1484include/generated/utsrelease.h: include/config/kernel.release FORCE 1485 $(call filechk,utsrelease.h) 1486 1487filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1488 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1489 1490include/generated/compile.h: FORCE 1491 $(call filechk,compile.h) 1492 1493PHONY += headerdep 1494headerdep: 1495 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1496 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1497 1498# --------------------------------------------------------------------------- 1499# Kernel headers 1500 1501#Default location for installed headers 1502export INSTALL_HDR_PATH = $(objtree)/usr 1503 1504quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1505 cmd_headers_install = \ 1506 mkdir -p $(INSTALL_HDR_PATH); \ 1507 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1508 usr/include $(INSTALL_HDR_PATH) 1509 1510PHONY += headers_install 1511headers_install: headers 1512 $(call cmd,headers_install) 1513 1514PHONY += archheaders archscripts 1515 1516hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1517 1518PHONY += headers 1519headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1520ifdef HEADER_ARCH 1521 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1522else 1523 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1524 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1525endif 1526 1527ifdef CONFIG_HEADERS_INSTALL 1528prepare: headers 1529endif 1530 1531PHONY += usr_gen_init_cpio 1532usr_gen_init_cpio: scripts_basic 1533 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1534 1535PHONY += scripts_unifdef 1536scripts_unifdef: scripts_basic 1537 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1538 1539PHONY += scripts_gen_packed_field_checks 1540scripts_gen_packed_field_checks: scripts_basic 1541 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1542 1543# --------------------------------------------------------------------------- 1544# Install 1545 1546# Many distributions have the custom install script, /sbin/installkernel. 1547# If DKMS is installed, 'make install' will eventually recurse back 1548# to this Makefile to build and install external modules. 1549# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1550 1551quiet_cmd_install = INSTALL $(INSTALL_PATH) 1552 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1553 1554# --------------------------------------------------------------------------- 1555# vDSO install 1556 1557PHONY += vdso_install 1558vdso_install: export INSTALL_FILES = $(vdso-install-y) 1559vdso_install: 1560 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1561 1562# --------------------------------------------------------------------------- 1563# Tools 1564 1565ifdef CONFIG_OBJTOOL 1566prepare: tools/objtool 1567endif 1568 1569ifdef CONFIG_BPF 1570ifdef CONFIG_DEBUG_INFO_BTF 1571prepare: tools/bpf/resolve_btfids 1572endif 1573endif 1574 1575# tools/bootconfig renders the embedded bootconfig into a cmdline at build time. 1576ifdef CONFIG_CMDLINE_FROM_BOOTCONFIG 1577prepare: tools/bootconfig 1578endif 1579 1580# tools/bootconfig is run on the build host during prepare, so force a host 1581# binary here; its own Makefile keeps $(CC) for standalone and cross builds. 1582# CROSS_COMPILE= is cleared so tools/scripts/Makefile.include does not inject 1583# the target's --target=/--sysroot= flags into the host clang invocation under 1584# LLVM=1 cross builds (which would produce a target binary that fails to exec). 1585tools/bootconfig: export CC := $(HOSTCC) 1586tools/bootconfig: FORCE 1587 $(Q)mkdir -p $(objtree)/tools 1588 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ \ 1589 bootconfig CROSS_COMPILE= 1590 1591# The tools build system is not a part of Kbuild and tends to introduce 1592# its own unique issues. If you need to integrate a new tool into Kbuild, 1593# please consider locating that tool outside the tools/ tree and using the 1594# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1595# here. See Documentation/kbuild/makefiles.rst for details. 1596 1597PHONY += resolve_btfids_clean 1598 1599resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1600 1601# tools/bpf/resolve_btfids directory might not exist 1602# in output directory, skip its clean in that case 1603resolve_btfids_clean: 1604ifneq ($(wildcard $(resolve_btfids_O)),) 1605 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1606endif 1607 1608PHONY += objtool_clean objtool_mrproper 1609 1610objtool_O = $(abspath $(objtree))/tools/objtool 1611 1612objtool_clean objtool_mrproper: 1613ifneq ($(wildcard $(objtool_O)),) 1614 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1615endif 1616 1617PHONY += bootconfig_clean 1618 1619bootconfig_O = $(abspath $(objtree))/tools/bootconfig 1620 1621bootconfig_clean: 1622ifneq ($(wildcard $(bootconfig_O)),) 1623 $(Q)$(MAKE) -sC $(srctree)/tools/bootconfig O=$(bootconfig_O) clean 1624endif 1625 1626tools/: FORCE 1627 $(Q)mkdir -p $(objtree)/tools 1628 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1629 1630tools/%: FORCE 1631 $(Q)mkdir -p $(objtree)/tools 1632 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1633 1634# --------------------------------------------------------------------------- 1635# Kernel selftest 1636 1637PHONY += kselftest 1638kselftest: headers 1639 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1640 1641kselftest-%: headers FORCE 1642 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests $* 1643 1644PHONY += kselftest-merge 1645kselftest-merge: 1646 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1647 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1648 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1649 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1650 1651# --------------------------------------------------------------------------- 1652# Devicetree files 1653 1654ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1655dtstree := arch/$(SRCARCH)/boot/dts 1656endif 1657 1658dtbindingtree := Documentation/devicetree/bindings 1659 1660%.yaml: dtbs_prepare 1661 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1662 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1663 1664ifneq ($(dtstree),) 1665 1666%.dtb: dtbs_prepare 1667 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1668 1669%.dtbo: dtbs_prepare 1670 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1671 1672PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1673dtbs: dtbs_prepare 1674 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1675 1676# include/config/kernel.release is actually needed when installing DTBs because 1677# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1678# dtbs_install depend on it as dtbs_install may run as root. 1679dtbs_prepare: include/config/kernel.release scripts_dtc 1680 1681ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1682export CHECK_DTBS=y 1683endif 1684 1685ifneq ($(CHECK_DTBS),) 1686dtbs_prepare: dt_binding_schemas 1687endif 1688 1689dtbs_check: dtbs 1690 1691dtbs_install: 1692 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1693 1694ifdef CONFIG_OF_EARLY_FLATTREE 1695all: dtbs 1696endif 1697 1698ifdef CONFIG_GENERIC_BUILTIN_DTB 1699vmlinux: dtbs 1700endif 1701 1702endif 1703 1704PHONY += scripts_dtc 1705scripts_dtc: scripts_basic 1706 $(Q)$(MAKE) $(build)=scripts/dtc 1707 1708ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1709export CHECK_DTBS=y 1710endif 1711 1712PHONY += dt_binding_check dt_binding_schemas 1713dt_binding_check: dt_binding_schemas scripts_dtc 1714 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1715 1716dt_binding_schemas: 1717 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1718 1719PHONY += dt_compatible_check 1720dt_compatible_check: dt_binding_schemas 1721 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1722 1723PHONY += dt_style_selftest 1724dt_style_selftest: 1725 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1726 1727# --------------------------------------------------------------------------- 1728# Modules 1729 1730ifdef CONFIG_MODULES 1731 1732# By default, build modules as well 1733 1734all: modules 1735 1736# When we're building modules with modversions, we need to consider 1737# the built-in objects during the descend as well, in order to 1738# make sure the checksums are up to date before we record them. 1739ifdef CONFIG_MODVERSIONS 1740 KBUILD_BUILTIN := y 1741endif 1742 1743# Build modules 1744# 1745 1746# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1747# is an exception. 1748ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1749KBUILD_BUILTIN := y 1750modules: vmlinux 1751endif 1752 1753modules: modules_prepare 1754 1755# Target to prepare building external modules 1756modules_prepare: prepare 1757 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1758 1759endif # CONFIG_MODULES 1760 1761### 1762# Cleaning is done on three levels. 1763# make clean Delete most generated files 1764# Leave enough to build external modules 1765# make mrproper Delete the current configuration, and all generated files 1766# make distclean Remove editor backup files, patch leftover files and the like 1767 1768# Directories & files removed with 'make clean' 1769CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1770 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1771 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1772 vmlinux.thinlto-index builtin.order \ 1773 compile_commands.json rust/test \ 1774 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1775 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1776 1777# Directories & files removed with 'make mrproper' 1778MRPROPER_FILES += include/config include/generated \ 1779 arch/$(SRCARCH)/include/generated .objdiff \ 1780 debian snap tar-install PKGBUILD pacman \ 1781 .config .config.old .version \ 1782 Module.symvers \ 1783 certs/signing_key.pem \ 1784 certs/x509.genkey \ 1785 vmlinux-gdb.py \ 1786 rpmbuild \ 1787 rust/libmacros.so rust/libmacros.dylib \ 1788 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1789 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1790 1791# clean - Delete most, but leave enough to build external modules 1792# 1793clean: private rm-files := $(CLEAN_FILES) 1794 1795PHONY += archclean vmlinuxclean 1796 1797vmlinuxclean: 1798 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1799 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1800 1801clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean bootconfig_clean 1802 1803# mrproper - Delete all generated files, including .config 1804# 1805mrproper: private rm-files := $(MRPROPER_FILES) 1806mrproper-dirs := $(addprefix _mrproper_,scripts) 1807 1808PHONY += $(mrproper-dirs) mrproper 1809$(mrproper-dirs): 1810 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1811 1812mrproper: clean objtool_mrproper $(mrproper-dirs) 1813 $(call cmd,rmfiles) 1814 @find . $(RCS_FIND_IGNORE) \ 1815 \( -name '*.rmeta' \) \ 1816 -type f -print | xargs rm -f 1817 1818# distclean 1819# 1820PHONY += distclean 1821 1822distclean: mrproper 1823 @find . $(RCS_FIND_IGNORE) \ 1824 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1825 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1826 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1827 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1828 -type f -print | xargs rm -f 1829 1830 1831# Packaging of the kernel to various formats 1832# --------------------------------------------------------------------------- 1833 1834modules-cpio-pkg: usr_gen_init_cpio 1835 1836%src-pkg: FORCE 1837 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1838%pkg: include/config/kernel.release FORCE 1839 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1840 1841# Brief documentation of the typical targets used 1842# --------------------------------------------------------------------------- 1843 1844boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1845boards := $(sort $(notdir $(boards))) 1846board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1847board-dirs := $(sort $(notdir $(board-dirs:/=))) 1848 1849PHONY += help 1850help: 1851 @echo 'Cleaning targets:' 1852 @echo ' clean - Remove most generated files but keep the config and' 1853 @echo ' enough build support to build external modules' 1854 @echo ' mrproper - Remove all generated files + config + various backup files' 1855 @echo ' distclean - mrproper + remove editor backup and patch files' 1856 @echo '' 1857 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1858 @echo '' 1859 @echo 'Other generic targets:' 1860 @echo ' all - Build all targets marked with [*]' 1861 @echo '* vmlinux - Build the bare kernel' 1862 @echo '* modules - Build all modules' 1863 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1864 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1865 @echo ' dir/ - Build all files in dir and below' 1866 @echo ' dir/file.[ois] - Build specified target only' 1867 @echo ' dir/file.ll - Build the LLVM assembly file' 1868 @echo ' (requires compiler support for LLVM assembly generation)' 1869 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1870 @echo ' (requires a recent binutils and recent build (System.map))' 1871 @echo ' dir/file.ko - Build module including final link' 1872 @echo ' modules_prepare - Set up for building external modules' 1873 @echo ' tags/TAGS - Generate tags file for editors' 1874 @echo ' cscope - Generate cscope index' 1875 @echo ' gtags - Generate GNU GLOBAL index' 1876 @echo ' kernelrelease - Output the release version string (use with make -s)' 1877 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1878 @echo ' image_name - Output the image name (use with make -s)' 1879 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1880 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1881 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1882 echo '' 1883 @echo 'Static analysers:' 1884 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1885 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1886 @echo ' versioncheck - Sanity check on version.h usage' 1887 @echo ' includecheck - Check for duplicate included header files' 1888 @echo ' headerdep - Detect inclusion cycles in headers' 1889 @echo ' coccicheck - Check with Coccinelle' 1890 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1891 @echo ' clang-analyzer - Check with clang static analyzer' 1892 @echo ' clang-tidy - Check with clang-tidy' 1893 @echo '' 1894 @echo 'Tools:' 1895 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1896 @echo ' sbom - Generate Software Bill of Materials' 1897 @echo '' 1898 @echo 'Kernel selftest:' 1899 @echo ' kselftest - Build and run kernel selftest' 1900 @echo ' Build, install, and boot kernel before' 1901 @echo ' running kselftest on it' 1902 @echo ' Run as root for full coverage' 1903 @echo ' kselftest-all - Build kernel selftest' 1904 @echo ' kselftest-install - Build and install kernel selftest' 1905 @echo ' kselftest-clean - Remove all generated kselftest files' 1906 @echo ' kselftest-merge - Merge all the config dependencies of' 1907 @echo ' kselftest to existing .config.' 1908 @echo '' 1909 @echo 'Rust targets:' 1910 @echo ' rustavailable - Checks whether the Rust toolchain is' 1911 @echo ' available and, if not, explains why.' 1912 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1913 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1914 @echo ' is formatted, printing a diff otherwise.' 1915 @echo ' rustdoc - Generate Rust documentation' 1916 @echo ' (requires kernel .config)' 1917 @echo ' rusttest - Runs the Rust tests' 1918 @echo ' (requires kernel .config; downloads external repos)' 1919 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1920 @echo ' (requires kernel .config)' 1921 @echo ' dir/file.[os] - Build specified target only' 1922 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1923 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1924 @echo ' The output is not intended to be compilable.' 1925 @echo ' dir/file.ll - Build the LLVM assembly file' 1926 @echo '' 1927 @$(if $(dtstree), \ 1928 echo 'Devicetree:'; \ 1929 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1930 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1931 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1932 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1933 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1934 echo ' dtbs_check - Validate device tree source files';\ 1935 echo '') 1936 1937 @echo 'Userspace tools targets:' 1938 @echo ' use "make tools/help"' 1939 @echo ' or "cd tools; make help"' 1940 @echo '' 1941 @echo 'Kernel packaging:' 1942 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1943 @echo '' 1944 @echo 'Documentation targets:' 1945 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1946 @echo '' 1947 @echo 'Architecture-specific targets ($(SRCARCH)):' 1948 @$(or $(archhelp),\ 1949 echo ' No architecture-specific help defined for $(SRCARCH)') 1950 @echo '' 1951 @$(if $(boards), \ 1952 $(foreach b, $(boards), \ 1953 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1954 echo '') 1955 @$(if $(board-dirs), \ 1956 $(foreach b, $(board-dirs), \ 1957 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1958 printf " %-16s - Show all of the above\\n" help-boards; \ 1959 echo '') 1960 1961 @echo ' make V=n [targets] 1: verbose build' 1962 @echo ' 2: give reason for rebuild of target' 1963 @echo ' V=1 and V=2 can be combined with V=12' 1964 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1965 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1966 @echo ' (sparse by default)' 1967 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1968 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1969 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1970 @echo ' 1: warnings which may be relevant and do not occur too often' 1971 @echo ' 2: warnings which occur quite often but may still be relevant' 1972 @echo ' 3: more obscure warnings, can most likely be ignored' 1973 @echo ' c: extra checks in the configuration stage (Kconfig)' 1974 @echo ' e: warnings are being treated as errors' 1975 @echo ' Multiple levels can be combined with W=12 or W=123' 1976 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1977 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1978 @$(if $(dtstree), \ 1979 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1980 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1981 ) 1982 @echo '' 1983 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1984 @echo 'For further info see the ./README file' 1985 1986 1987help-board-dirs := $(addprefix help-,$(board-dirs)) 1988 1989help-boards: $(help-board-dirs) 1990 1991boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1992 1993$(help-board-dirs): help-%: 1994 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1995 @$(if $(boards-per-dir), \ 1996 $(foreach b, $(boards-per-dir), \ 1997 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1998 echo '') 1999 2000 2001# Documentation targets 2002# --------------------------------------------------------------------------- 2003DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 2004 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 2005 htmldocs-redirects 2006 2007PHONY += $(DOC_TARGETS) 2008$(DOC_TARGETS): 2009 $(Q)$(MAKE) $(build)=Documentation $@ 2010 2011 2012# Rust targets 2013# --------------------------------------------------------------------------- 2014 2015# "Is Rust available?" target 2016PHONY += rustavailable 2017rustavailable: 2018 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 2019 2020# Documentation target 2021# 2022# Using the singular to avoid running afoul of `no-dot-config-targets`. 2023PHONY += rustdoc 2024rustdoc: prepare 2025 $(Q)$(MAKE) $(build)=rust $@ 2026 2027# Testing target 2028PHONY += rusttest 2029rusttest: prepare 2030 $(Q)$(MAKE) $(build)=rust $@ 2031 2032# Formatting targets 2033# 2034# Generated files as well as vendored crates are skipped. 2035PHONY += rustfmt rustfmtcheck 2036 2037rustfmt: 2038 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 2039 \( \ 2040 -path $(srctree)/rust/proc-macro2 \ 2041 -o -path $(srctree)/rust/quote \ 2042 -o -path $(srctree)/rust/syn \ 2043 -o -path $(srctree)/rust/zerocopy \ 2044 -o -path $(srctree)/rust/zerocopy-derive \ 2045 \) -prune -o \ 2046 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2047 | xargs $(RUSTFMT) $(rustfmt_flags) 2048 2049rustfmtcheck: rustfmt_flags = --check 2050rustfmtcheck: rustfmt 2051 2052# Misc 2053# --------------------------------------------------------------------------- 2054 2055PHONY += misc-check 2056misc-check: 2057 $(Q)$(srctree)/scripts/misc-check 2058 2059all: misc-check 2060 2061PHONY += scripts_gdb 2062scripts_gdb: prepare0 2063 $(Q)$(MAKE) $(build)=scripts/gdb 2064 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2065 2066ifdef CONFIG_GDB_SCRIPTS 2067all: scripts_gdb 2068endif 2069 2070else # KBUILD_EXTMOD 2071 2072filechk_kernel.release = echo $(KERNELRELEASE) 2073 2074### 2075# External module support. 2076# When building external modules the kernel used as basis is considered 2077# read-only, and no consistency checks are made and the make 2078# system is not used on the basis kernel. If updates are required 2079# in the basis kernel ordinary make commands (without M=...) must be used. 2080 2081# We are always building only modules. 2082KBUILD_BUILTIN := 2083KBUILD_MODULES := y 2084 2085build-dir := . 2086 2087clean-dirs := . 2088clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2089 2090PHONY += prepare 2091# now expand this into a simple variable to reduce the cost of shell evaluations 2092prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2093prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2094prepare: 2095 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2096 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2097 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2098 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2099 fi 2100 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2101 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2102 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2103 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2104 fi 2105 2106PHONY += help 2107help: 2108 @echo ' Building external modules.' 2109 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2110 @echo '' 2111 @echo ' modules - default target, build the module(s)' 2112 @echo ' modules_install - install the module' 2113 @echo ' clean - remove generated files in module directory only' 2114 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2115 @echo '' 2116 2117ifndef CONFIG_MODULES 2118modules modules_install: __external_modules_error 2119__external_modules_error: 2120 @echo >&2 '***' 2121 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2122 @echo >&2 '*** You cannot build or install external modules.' 2123 @echo >&2 '***' 2124 @false 2125endif 2126 2127endif # KBUILD_EXTMOD 2128 2129# --------------------------------------------------------------------------- 2130# Modules 2131 2132PHONY += modules modules_install modules_sign modules_prepare 2133 2134modules_install: 2135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2136 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2137 2138ifeq ($(CONFIG_MODULE_SIG),y) 2139# modules_sign is a subset of modules_install. 2140# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2141modules_sign: modules_install 2142 @: 2143else 2144modules_sign: 2145 @echo >&2 '***' 2146 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2147 @echo >&2 '***' 2148 @false 2149endif 2150 2151ifdef CONFIG_MODULES 2152 2153modules.order: $(build-dir) 2154 @: 2155 2156# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2157# This is solely useful to speed up test compiles. 2158modules: modpost 2159ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2160 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2161endif 2162 2163PHONY += modules_check 2164modules_check: modules.order 2165 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2166 2167else # CONFIG_MODULES 2168 2169modules: 2170 @: 2171 2172KBUILD_MODULES := 2173 2174endif # CONFIG_MODULES 2175 2176PHONY += modpost 2177modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2178 $(if $(KBUILD_MODULES), modules_check) 2179 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2180 2181# Single targets 2182# --------------------------------------------------------------------------- 2183# To build individual files in subdirectories, you can do like this: 2184# 2185# make foo/bar/baz.s 2186# 2187# The supported suffixes for single-target are listed in 'single-targets' 2188# 2189# To build only under specific subdirectories, you can do like this: 2190# 2191# make foo/bar/baz/ 2192 2193ifdef single-build 2194 2195# .ko is special because modpost is needed 2196single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2197single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2198 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2199 2200$(single-ko): single_modules 2201 @: 2202$(single-no-ko): $(build-dir) 2203 @: 2204 2205# Remove modules.order when done because it is not the real one. 2206PHONY += single_modules 2207single_modules: $(single-no-ko) modules_prepare 2208 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2209 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2210ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2211 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2212endif 2213 $(Q)rm -f modules.order 2214 2215single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2216 2217KBUILD_MODULES := y 2218 2219endif 2220 2221prepare: outputmakefile 2222 2223# Preset locale variables to speed up the build process. Limit locale 2224# tweaks to this spot to avoid wrong language settings when running 2225# make menuconfig etc. 2226# Error messages still appears in the original language 2227PHONY += $(build-dir) 2228$(build-dir): prepare 2229 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2230 2231clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2232PHONY += $(clean-dirs) clean 2233$(clean-dirs): 2234 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2235 2236clean: $(clean-dirs) 2237 $(call cmd,rmfiles) 2238 @find . $(RCS_FIND_IGNORE) \ 2239 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2240 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2241 -o -name '*.dtb' -o -name '*.dtbo' \ 2242 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2243 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2244 -o -name '*.dwo' -o -name '*.lst' \ 2245 -o -name '*.su' -o -name '*.mod' \ 2246 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2247 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2248 -o -name '*.asn1.[ch]' \ 2249 -o -name '*.symtypes' -o -name 'modules.order' \ 2250 -o -name '*.c.[012]*.*' \ 2251 -o -name '*.ll' \ 2252 -o -name '*.gcno' \ 2253 -o -name '*.long-type-*.txt' \ 2254 \) -type f -print \ 2255 -o -name '.tmp_*' -print \ 2256 | xargs rm -rf 2257 2258# Generate tags for editors 2259# --------------------------------------------------------------------------- 2260quiet_cmd_tags = GEN $@ 2261 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2262 2263tags TAGS cscope gtags: FORCE 2264 $(call cmd,tags) 2265 2266# Generate rust-project.json (a file that describes the structure of non-Cargo 2267# Rust projects) for rust-analyzer (an implementation of the Language Server 2268# Protocol). 2269PHONY += rust-analyzer 2270rust-analyzer: 2271 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2272ifdef KBUILD_EXTMOD 2273# FIXME: external modules must not descend into a sub-directory of the kernel 2274 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2275else 2276 $(Q)$(MAKE) $(build)=rust $@ 2277endif 2278 2279# Script to generate missing namespace dependencies 2280# --------------------------------------------------------------------------- 2281 2282PHONY += nsdeps 2283nsdeps: export KBUILD_NSDEPS=1 2284nsdeps: modules 2285 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2286 2287# Script to generate .spdx.json SBOM documents describing the build 2288# --------------------------------------------------------------------------- 2289 2290ifdef building_out_of_srctree 2291sbom_targets := sbom-source.spdx.json 2292endif 2293sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2294quiet_cmd_sbom = GEN $(sbom_targets) 2295 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2296 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2297 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2298 --src-tree $(abspath $(srctree)) \ 2299 --obj-tree $(abspath $(objtree)) \ 2300 --roots-file "$(tmp-target)" \ 2301 --output-directory $(abspath $(objtree)) \ 2302 --generate-spdx \ 2303 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2304 --package-version "$(KERNELVERSION)" \ 2305 --write-output-on-error; 2306PHONY += sbom 2307sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2308 $(call cmd,sbom) 2309 2310# Clang Tooling 2311# --------------------------------------------------------------------------- 2312 2313quiet_cmd_gen_compile_commands = GEN $@ 2314 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2315 2316compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2317 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2318 $(if $(CONFIG_MODULES), modules.order) FORCE 2319 $(call if_changed,gen_compile_commands) 2320 2321targets += compile_commands.json 2322 2323PHONY += clang-tidy clang-analyzer 2324 2325ifdef CONFIG_CC_IS_CLANG 2326quiet_cmd_clang_tools = CHECK $< 2327 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2328 2329clang-tidy clang-analyzer: compile_commands.json 2330 $(call cmd,clang_tools) 2331else 2332clang-tidy clang-analyzer: 2333 @echo "$@ requires CC=clang" >&2 2334 @false 2335endif 2336 2337# Scripts to check various things for consistency 2338# --------------------------------------------------------------------------- 2339 2340PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2341 2342includecheck: 2343 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2344 -name '*.[hcS]' -type f -print | sort \ 2345 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2346 2347versioncheck: 2348 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2349 -name '*.[hcS]' -type f -print | sort \ 2350 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2351 2352coccicheck: 2353 $(Q)$(BASH) $(srctree)/scripts/$@ 2354 2355kconfig-sym-check: 2356 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2357 2358PHONY += checkstack kernelrelease kernelversion image_name 2359 2360# UML needs a little special treatment here. It wants to use the host 2361# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2362# else wants $(ARCH), including people doing cross-builds, which means 2363# that $(SUBARCH) doesn't work here. 2364ifeq ($(ARCH), um) 2365CHECKSTACK_ARCH := $(SUBARCH) 2366else 2367CHECKSTACK_ARCH := $(ARCH) 2368endif 2369MINSTACKSIZE ?= 100 2370checkstack: 2371 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2372 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2373 2374kernelrelease: 2375 @$(filechk_kernel.release) 2376 2377kernelversion: 2378 @echo $(KERNELVERSION) 2379 2380image_name: 2381 @echo $(KBUILD_IMAGE) 2382 2383PHONY += run-command 2384run-command: 2385 $(Q)$(KBUILD_RUN_COMMAND) 2386 2387quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2388 cmd_rmfiles = rm -rf $(rm-files) 2389 2390# read saved command lines for existing targets 2391existing-targets := $(wildcard $(sort $(targets))) 2392 2393-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2394 2395endif # config-build 2396endif # mixed-build 2397endif # need-sub-make 2398 2399PHONY += FORCE 2400FORCE: 2401 2402# Declare the contents of the PHONY variable as phony. We keep that 2403# information in a variable so we can use it in if_changed and friends. 2404.PHONY: $(PHONY) 2405