1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 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 $(abs_srctree)/Makefile"; \ 701 } 702 703$(objtree)/Makefile: FORCE 704 $(call filechk,makefile) 705 706# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 707PHONY += $(objtree)/Makefile 708 709outputmakefile: $(objtree)/Makefile 710ifeq ($(KBUILD_EXTMOD),) 711 @if [ -f $(srctree)/.config -o \ 712 -d $(srctree)/include/config -o \ 713 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 714 echo >&2 "***"; \ 715 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 716 echo >&2 "*** in $(abs_srctree)";\ 717 echo >&2 "***"; \ 718 false; \ 719 fi 720else 721 @if [ -f $(srcroot)/modules.order ]; then \ 722 echo >&2 "***"; \ 723 echo >&2 "*** The external module source tree is not clean."; \ 724 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 725 echo >&2 "***"; \ 726 false; \ 727 fi 728endif 729 $(Q)ln -fsn $(srcroot) source 730 $(Q)test -e .gitignore || \ 731 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 732endif 733 734# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 735# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 736# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 737# Kconfig (so they need export), and from include/config/auto.conf.cmd to 738# detect the version changes between builds. 739CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 740RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 741PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 742 743ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 744include $(srctree)/scripts/Makefile.clang 745endif 746 747# Include this also for config targets because some architectures need 748# cc-cross-prefix to determine CROSS_COMPILE. 749ifdef need-compiler 750include $(srctree)/scripts/Makefile.compiler 751endif 752 753ifdef config-build 754# =========================================================================== 755# *config targets only - make sure prerequisites are updated, and descend 756# in scripts/kconfig to make the *config target 757 758# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 759# KBUILD_DEFCONFIG may point out an alternative default configuration 760# used for 'make defconfig' 761include $(srctree)/arch/$(SRCARCH)/Makefile 762export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 763 764config: outputmakefile scripts_basic FORCE 765 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 766 767%config: outputmakefile scripts_basic FORCE 768 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 769 770else #!config-build 771# =========================================================================== 772# Build targets only - this includes vmlinux, arch-specific targets, clean 773# targets and others. In general all targets except *config targets. 774 775# If building an external module we do not care about the all: rule 776# but instead __all depend on modules 777PHONY += all 778ifeq ($(KBUILD_EXTMOD),) 779__all: all 780else 781__all: modules 782endif 783 784targets := 785 786# Decide whether to build built-in, modular, or both. 787# Normally, just do built-in. 788 789KBUILD_MODULES := 790KBUILD_BUILTIN := y 791 792# If we have only "make modules", don't compile built-in objects. 793ifeq ($(MAKECMDGOALS),modules) 794 KBUILD_BUILTIN := 795endif 796 797# If we have "make <whatever> modules", compile modules 798# in addition to whatever we do anyway. 799# Just "make" or "make all" shall build modules as well 800 801ifneq ($(filter all modules nsdeps compile_commands.json clang-% sbom,$(MAKECMDGOALS)),) 802 KBUILD_MODULES := y 803endif 804 805ifeq ($(MAKECMDGOALS),) 806 KBUILD_MODULES := y 807endif 808 809export KBUILD_MODULES KBUILD_BUILTIN 810 811ifdef need-config 812include $(objtree)/include/config/auto.conf 813endif 814 815CC_FLAGS_DIALECT := -std=gnu11 816# Allow including a tagged struct or union anonymously in another struct/union. 817CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 818# Clang enables warnings about GNU and Microsoft extensions by default, disable 819# them because this is expected with the above options. 820ifdef CONFIG_CC_IS_CLANG 821CC_FLAGS_DIALECT += -Wno-gnu 822CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 823endif 824export CC_FLAGS_DIALECT 825KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 826 827ifeq ($(KBUILD_EXTMOD),) 828# Objects we will link into vmlinux / subdirs we need to visit 829core-y := 830drivers-y := 831libs-y := lib/ 832endif # KBUILD_EXTMOD 833 834# The all: target is the default when no target is given on the 835# command line. 836# This allow a user to issue only 'make' to build a kernel including modules 837# Defaults to vmlinux, but the arch makefile usually adds further targets 838all: vmlinux 839 840# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 841ifdef CONFIG_FUNCTION_TRACER 842 CC_FLAGS_FTRACE := -pg 843endif 844 845ifdef CONFIG_TRACEPOINTS 846# To check for unused tracepoints (tracepoints that are defined but never 847# called), run with: 848# 849# make UT=1 850# 851# Each unused tracepoints can take up to 5KB of memory in the running kernel. 852# It is best to remove any that are not used. 853# 854# This command line option will be removed when all current unused 855# tracepoints are removed. 856 857ifeq ("$(origin UT)", "command line") 858 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 859endif 860endif # CONFIG_TRACEPOINTS 861 862export WARN_ON_UNUSED_TRACEPOINTS 863 864# Per-version Rust flags. These are like `rust_common_flags`, but may 865# depend on the Rust compiler version (e.g. using `rustc-min-version`). 866# 867# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 868# include bitmasking and shift operations. However, because it generated 869# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 870# lint which is not enabled by default. 871rust_common_flags_per_version := \ 872 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 873 874rust_common_flags += $(rust_common_flags_per_version) 875KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 876KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 877 878include $(srctree)/arch/$(SRCARCH)/Makefile 879 880ifdef need-config 881ifdef may-sync-config 882# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 883# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 884# because some architectures define CROSS_COMPILE there. 885include include/config/auto.conf.cmd 886 887$(KCONFIG_CONFIG): 888 @echo >&2 '***' 889 @echo >&2 '*** Configuration file "$@" not found!' 890 @echo >&2 '***' 891 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 892 @echo >&2 '*** "make menuconfig" or "make xconfig").' 893 @echo >&2 '***' 894 @/bin/false 895 896# The actual configuration files used during the build are stored in 897# include/generated/ and include/config/. Update them if .config is newer than 898# include/config/auto.conf (which mirrors .config). 899# 900# This exploits the 'multi-target pattern rule' trick. 901# The syncconfig should be executed only once to make all the targets. 902# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 903# 904# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 905# so you cannot notice that Kconfig is waiting for the user input. 906%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 907 $(Q)$(kecho) " SYNC $@" 908 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 909else # !may-sync-config 910# External modules and some install targets need include/generated/autoconf.h 911# and include/config/auto.conf but do not care if they are up-to-date. 912# Use auto.conf to show the error message 913 914checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 915missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 916 917ifdef missing-configs 918PHONY += $(objtree)/include/config/auto.conf 919 920$(objtree)/include/config/auto.conf: 921 @echo >&2 '***' 922 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 923 @printf >&2 '*** - %s\n' $(missing-configs) 924 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 925 @echo >&2 '***' 926 @/bin/false 927endif 928 929endif # may-sync-config 930endif # need-config 931 932KBUILD_CFLAGS += -fno-delete-null-pointer-checks 933 934ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 935KBUILD_CFLAGS += -O2 936KBUILD_RUSTFLAGS += -Copt-level=2 937else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 938KBUILD_CFLAGS += -Os 939KBUILD_RUSTFLAGS += -Copt-level=s 940endif 941 942# Always set `debug-assertions` and `overflow-checks` because their default 943# depends on `opt-level` and `debug-assertions`, respectively. 944KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 945KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 946 947# Tell gcc to never replace conditional load with a non-conditional one 948ifdef CONFIG_CC_IS_GCC 949# gcc-10 renamed --param=allow-store-data-races=0 to 950# -fno-allow-store-data-races. 951KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 952KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 953endif 954 955ifdef CONFIG_READABLE_ASM 956# Disable optimizations that make assembler listings hard to read. 957# reorder blocks reorders the control in the function 958# ipa clone creates specialized cloned functions 959# partial inlining inlines only parts of functions 960KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 961endif 962 963stackp-flags-y := -fno-stack-protector 964stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 965stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 966 967KBUILD_CFLAGS += $(stackp-flags-y) 968 969ifdef CONFIG_FRAME_POINTER 970KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 971KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 972# Work around rustc bug on compilers without 973# https://github.com/rust-lang/rust/pull/156980. 974KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=frame-pointer:u32:2:max) 975else 976# Some targets (ARM with Thumb2, for example), can't be built with frame 977# pointers. For those, we don't have FUNCTION_TRACER automatically 978# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 979# incompatible with -fomit-frame-pointer with current GCC, so we don't use 980# -fomit-frame-pointer with FUNCTION_TRACER. 981# In the Rust target specification, "frame-pointer" is set explicitly 982# to "may-omit". 983ifndef CONFIG_FUNCTION_TRACER 984KBUILD_CFLAGS += -fomit-frame-pointer 985endif 986endif 987 988# Initialize all stack variables with a 0xAA pattern. 989ifdef CONFIG_INIT_STACK_ALL_PATTERN 990KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 991endif 992 993# Initialize all stack variables with a zero value. 994ifdef CONFIG_INIT_STACK_ALL_ZERO 995KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 996ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 997# https://github.com/llvm/llvm-project/issues/44842 998CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 999export CC_AUTO_VAR_INIT_ZERO_ENABLER 1000KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 1001endif 1002endif 1003 1004ifdef CONFIG_KMALLOC_PARTITION_TYPED 1005# KMALLOC_PARTITION_CACHES_NR + 1 1006KBUILD_CFLAGS += -falloc-token-max=16 1007endif 1008 1009ifdef CONFIG_CC_IS_CLANG 1010ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1011KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1012endif 1013endif 1014 1015# Explicitly clear padding bits during variable initialization 1016KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1017 1018# While VLAs have been removed, GCC produces unreachable stack probes 1019# for the randomize_kstack_offset feature. Disable it for all compilers. 1020KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1021 1022# Get details on warnings generated due to GCC value tracking. 1023KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1024 1025# Show inlining notes for __attribute__((warning/error)) call chains. 1026# GCC supports this unconditionally while Clang 23+ provides a flag. 1027KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1028 1029# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1030ifdef CONFIG_ZERO_CALL_USED_REGS 1031KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1032endif 1033 1034ifdef CONFIG_FUNCTION_TRACER 1035ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1036 CC_FLAGS_FTRACE += -mrecord-mcount 1037 ifdef CONFIG_HAVE_NOP_MCOUNT 1038 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1039 CC_FLAGS_FTRACE += -mnop-mcount 1040 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1041 endif 1042 endif 1043endif 1044ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1045 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1046 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1047 endif 1048endif 1049ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1050 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1051 BUILD_C_RECORDMCOUNT := y 1052 export BUILD_C_RECORDMCOUNT 1053 endif 1054endif 1055ifdef CONFIG_HAVE_FENTRY 1056 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1057 ifeq ($(call cc-option-yn, -mfentry),y) 1058 CC_FLAGS_FTRACE += -mfentry 1059 CC_FLAGS_USING += -DCC_USING_FENTRY 1060 endif 1061endif 1062export CC_FLAGS_FTRACE 1063KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1064KBUILD_AFLAGS += $(CC_FLAGS_USING) 1065endif 1066 1067# We trigger additional mismatches with less inlining 1068ifdef CONFIG_DEBUG_SECTION_MISMATCH 1069KBUILD_CFLAGS += -fno-inline-functions-called-once 1070endif 1071 1072# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1073ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1074KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1075KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1076LDFLAGS_vmlinux += --gc-sections 1077endif 1078 1079ifdef CONFIG_SHADOW_CALL_STACK 1080ifndef CONFIG_DYNAMIC_SCS 1081CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1082KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1083KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1084endif 1085export CC_FLAGS_SCS 1086endif 1087 1088ifdef CONFIG_LTO_CLANG 1089ifdef CONFIG_LTO_CLANG_FULL 1090CC_FLAGS_LTO := -flto 1091else 1092CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1093 1094# These LLVM options were initially added with only in-process ThinLTO 1095# support, so avoid distributed ThinLTO support for now. 1096ifdef CONFIG_LTO_CLANG_THIN 1097KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1098endif 1099endif 1100CC_FLAGS_LTO += -fvisibility=hidden 1101 1102# Limit inlining across translation units to reduce binary size 1103KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1104endif 1105 1106ifdef CONFIG_LTO 1107KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1108KBUILD_AFLAGS += -fno-lto 1109export CC_FLAGS_LTO 1110endif 1111 1112ifdef CONFIG_CFI 1113CC_FLAGS_CFI := -fsanitize=kcfi 1114ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1115 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1116endif 1117ifdef CONFIG_FINEIBT_BHI 1118 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1119endif 1120ifdef CONFIG_RUST 1121 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1122 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1123 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1124 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1125 export RUSTC_FLAGS_CFI 1126endif 1127KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1128export CC_FLAGS_CFI 1129endif 1130 1131# Architectures can define flags to add/remove for floating-point support 1132CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1133export CC_FLAGS_FPU 1134export CC_FLAGS_NO_FPU 1135 1136ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1137# Set the minimal function alignment. Use the newer GCC option 1138# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1139# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1140ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1141KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1142else 1143KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1144endif 1145endif 1146 1147# arch Makefile may override CC so keep this after arch Makefile is included 1148NOSTDINC_FLAGS += -nostdinc 1149 1150# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1151# the kernel uses only C99 flexible arrays for dynamically sized trailing 1152# arrays. Enforce this for everything that may examine structure sizes and 1153# perform bounds checking. 1154KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1155 1156# disable invalid "can't wrap" optimizations for signed / pointers 1157KBUILD_CFLAGS += -fno-strict-overflow 1158 1159# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1160KBUILD_CFLAGS += -fno-stack-check 1161 1162# conserve stack if available 1163ifdef CONFIG_CC_IS_GCC 1164KBUILD_CFLAGS += -fconserve-stack 1165endif 1166 1167# Ensure compilers do not transform certain loops into calls to wcslen() 1168KBUILD_CFLAGS += -fno-builtin-wcslen 1169 1170CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1171ifdef CONFIG_CC_IS_GCC 1172CFLAGS_GCOV += -fno-tree-loop-im 1173# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1174# Only enable if -fprofile-update=prefer-atomic does not introduce new 1175# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1176CFLAGS_GCOV += $(call try-run,\ 1177 echo 'long long x; void f(void){x++;}' | \ 1178 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1179 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1180 echo 'long long x; void f(void){x++;}' | \ 1181 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1182 -ftest-coverage -fprofile-update=prefer-atomic \ 1183 -x c - -c -o "$$TMP" && \ 1184 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1185 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1186 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1187 -fprofile-update=prefer-atomic) 1188endif 1189export CFLAGS_GCOV 1190 1191# change __FILE__ to the relative path to the source directory 1192ifdef building_out_of_srctree 1193KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1194ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1195KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1196endif 1197endif 1198 1199# include additional Makefiles when needed 1200include-y := scripts/Makefile.warn 1201include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1202include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1203include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1204include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1205include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1206include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1207include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1208include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1209include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1210include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1211include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1212include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1213include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1214 1215include $(addprefix $(srctree)/, $(include-y)) 1216 1217# scripts/Makefile.gcc-plugins is intentionally included last. 1218# Do not add $(call cc-option,...) below this line. When you build the kernel 1219# from the clean source tree, the GCC plugins do not exist at this point. 1220 1221# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1222KBUILD_CPPFLAGS += $(KCPPFLAGS) 1223KBUILD_AFLAGS += $(KAFLAGS) 1224KBUILD_CFLAGS += $(KCFLAGS) 1225KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1226 1227KBUILD_LDFLAGS_MODULE += --build-id=sha1 1228LDFLAGS_vmlinux += --build-id=sha1 1229 1230KBUILD_LDFLAGS += -z noexecstack 1231ifeq ($(CONFIG_LD_IS_BFD),y) 1232KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1233endif 1234 1235ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1236LDFLAGS_vmlinux += -X 1237endif 1238 1239ifeq ($(CONFIG_RELR),y) 1240# ld.lld before 15 did not support -z pack-relative-relocs. 1241LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1242endif 1243 1244# We never want expected sections to be placed heuristically by the 1245# linker. All sections should be explicitly named in the linker script. 1246ifdef CONFIG_LD_ORPHAN_WARN 1247LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1248endif 1249 1250ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1251LDFLAGS_vmlinux += --emit-relocs --discard-none 1252endif 1253 1254# Align the architecture of userspace programs with the kernel 1255USERFLAGS_FROM_KERNEL := --target=% 1256 1257ifdef CONFIG_ARCH_USERFLAGS 1258KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1259KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1260else 1261# If not overridden also inherit the bit size 1262USERFLAGS_FROM_KERNEL += -m32 -m64 1263endif 1264 1265KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1266KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1267 1268# userspace programs are linked via the compiler, use the correct linker 1269ifdef CONFIG_CC_IS_CLANG 1270KBUILD_USERLDFLAGS += --ld-path=$(LD) 1271endif 1272 1273# make the checker run with the right architecture 1274CHECKFLAGS += --arch=$(ARCH) 1275 1276# insure the checker run with the right endianness 1277CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1278 1279# the checker needs the correct machine size 1280CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1281 1282# Validate the checker is available and functional 1283ifneq ($(KBUILD_CHECKSRC), 0) 1284 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1285 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1286 KBUILD_CHECKSRC = 0 1287 endif 1288endif 1289 1290# Default kernel image to build when no specific target is given. 1291# KBUILD_IMAGE may be overruled on the command line or 1292# set in the environment 1293# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1294# this default value 1295export KBUILD_IMAGE ?= vmlinux 1296 1297# 1298# INSTALL_PATH specifies where to place the updated kernel and system map 1299# images. Default is /boot, but you can set it to other values 1300export INSTALL_PATH ?= /boot 1301 1302# 1303# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1304# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1305# an argument if needed. Otherwise it defaults to the kernel install path 1306# 1307export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1308 1309# 1310# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1311# relocations required by build roots. This is not defined in the 1312# makefile but the argument can be passed to make if needed. 1313# 1314 1315MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1316export MODLIB 1317 1318PHONY += prepare0 1319 1320ifeq ($(KBUILD_EXTMOD),) 1321 1322build-dir := . 1323clean-dirs := $(sort . Documentation \ 1324 $(patsubst %/,%,$(filter %/, $(core-) \ 1325 $(drivers-) $(libs-)))) 1326 1327export ARCH_CORE := $(core-y) 1328export ARCH_LIB := $(filter %/, $(libs-y)) 1329export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1330# Externally visible symbols (used by link-vmlinux.sh) 1331 1332KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1333KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1334 1335export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1336export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1337 1338ifdef CONFIG_TRIM_UNUSED_KSYMS 1339# For the kernel to actually contain only the needed exported symbols, 1340# we have to build modules as well to determine what those symbols are. 1341KBUILD_MODULES := y 1342endif 1343 1344PHONY += vmlinux_a 1345vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1346 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1347 1348vmlinux.a: vmlinux_a 1349 @: 1350 1351PHONY += vmlinux_o 1352vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1353 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1354 1355vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1356 @: 1357 1358PHONY += vmlinux 1359# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1360# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1361# unrelated; the decompressors just happen to have the same base name, 1362# arch/*/boot/compressed/vmlinux. 1363# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1364# 1365# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1366# https://savannah.gnu.org/bugs/?61463 1367# For Make > 4.4, the following simple code will work: 1368# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1369vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1370vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1371vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1372 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1373 1374# The actual objects are generated when descending, 1375# make sure no implicit rule kicks in 1376$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1377 1378ifeq ($(origin KERNELRELEASE),file) 1379filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1380else 1381filechk_kernel.release = echo $(KERNELRELEASE) 1382endif 1383 1384# Store (new) KERNELRELEASE string in include/config/kernel.release 1385include/config/kernel.release: FORCE 1386 $(call filechk,kernel.release) 1387 1388# Additional helpers built in scripts/ 1389# Carefully list dependencies so we do not try to build scripts twice 1390# in parallel 1391PHONY += scripts 1392scripts: scripts_basic scripts_dtc 1393 $(Q)$(MAKE) $(build)=$(@) 1394 1395# Things we need to do before we recursively start building the kernel 1396# or the modules are listed in "prepare". 1397# A multi level approach is used. prepareN is processed before prepareN-1. 1398# archprepare is used in arch Makefiles and when processed asm symlink, 1399# version.h and scripts_basic is processed / created. 1400 1401PHONY += prepare archprepare 1402 1403archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1404 asm-generic $(version_h) include/generated/utsrelease.h \ 1405 include/generated/compile.h include/generated/autoconf.h \ 1406 include/generated/rustc_cfg remove-stale-files 1407 1408prepare0: archprepare 1409 $(Q)$(MAKE) $(build)=scripts/mod 1410 $(Q)$(MAKE) $(build)=. prepare 1411 1412# All the preparing.. 1413prepare: prepare0 1414ifdef CONFIG_RUST 1415 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1416 $(Q)$(MAKE) $(build)=rust 1417endif 1418 1419PHONY += remove-stale-files 1420remove-stale-files: 1421 $(Q)$(srctree)/scripts/remove-stale-files 1422 1423# Support for using generic headers in asm-generic 1424asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1425 1426PHONY += asm-generic uapi-asm-generic 1427asm-generic: uapi-asm-generic 1428 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1429 generic=include/asm-generic 1430uapi-asm-generic: 1431 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1432 generic=include/uapi/asm-generic 1433 1434# Generate some files 1435# --------------------------------------------------------------------------- 1436 1437# KERNELRELEASE can change from a few different places, meaning version.h 1438# needs to be updated, so this check is forced on all builds 1439 1440uts_len := 64 1441define filechk_utsrelease.h 1442 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1443 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1444 exit 1; \ 1445 fi; \ 1446 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1447endef 1448 1449define filechk_version.h 1450 if [ $(SUBLEVEL) -gt 255 ]; then \ 1451 echo \#define LINUX_VERSION_CODE $(shell \ 1452 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1453 else \ 1454 echo \#define LINUX_VERSION_CODE $(shell \ 1455 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1456 fi; \ 1457 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1458 ((c) > 255 ? 255 : (c)))'; \ 1459 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1460 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1461 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1462endef 1463 1464$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1465$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1466$(version_h): FORCE 1467 $(call filechk,version.h) 1468 1469include/generated/utsrelease.h: include/config/kernel.release FORCE 1470 $(call filechk,utsrelease.h) 1471 1472filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1473 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1474 1475include/generated/compile.h: FORCE 1476 $(call filechk,compile.h) 1477 1478PHONY += headerdep 1479headerdep: 1480 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1481 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1482 1483# --------------------------------------------------------------------------- 1484# Kernel headers 1485 1486#Default location for installed headers 1487export INSTALL_HDR_PATH = $(objtree)/usr 1488 1489quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1490 cmd_headers_install = \ 1491 mkdir -p $(INSTALL_HDR_PATH); \ 1492 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1493 usr/include $(INSTALL_HDR_PATH) 1494 1495PHONY += headers_install 1496headers_install: headers 1497 $(call cmd,headers_install) 1498 1499PHONY += archheaders archscripts 1500 1501hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1502 1503PHONY += headers 1504headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1505ifdef HEADER_ARCH 1506 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1507else 1508 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1509 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1510endif 1511 1512ifdef CONFIG_HEADERS_INSTALL 1513prepare: headers 1514endif 1515 1516PHONY += usr_gen_init_cpio 1517usr_gen_init_cpio: scripts_basic 1518 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1519 1520PHONY += scripts_unifdef 1521scripts_unifdef: scripts_basic 1522 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1523 1524PHONY += scripts_gen_packed_field_checks 1525scripts_gen_packed_field_checks: scripts_basic 1526 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1527 1528# --------------------------------------------------------------------------- 1529# Install 1530 1531# Many distributions have the custom install script, /sbin/installkernel. 1532# If DKMS is installed, 'make install' will eventually recurse back 1533# to this Makefile to build and install external modules. 1534# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1535 1536quiet_cmd_install = INSTALL $(INSTALL_PATH) 1537 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1538 1539# --------------------------------------------------------------------------- 1540# vDSO install 1541 1542PHONY += vdso_install 1543vdso_install: export INSTALL_FILES = $(vdso-install-y) 1544vdso_install: 1545 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1546 1547# --------------------------------------------------------------------------- 1548# Tools 1549 1550ifdef CONFIG_OBJTOOL 1551prepare: tools/objtool 1552endif 1553 1554ifdef CONFIG_BPF 1555ifdef CONFIG_DEBUG_INFO_BTF 1556prepare: tools/bpf/resolve_btfids 1557endif 1558endif 1559 1560# The tools build system is not a part of Kbuild and tends to introduce 1561# its own unique issues. If you need to integrate a new tool into Kbuild, 1562# please consider locating that tool outside the tools/ tree and using the 1563# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1564# here. See Documentation/kbuild/makefiles.rst for details. 1565 1566PHONY += resolve_btfids_clean 1567 1568resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1569 1570# tools/bpf/resolve_btfids directory might not exist 1571# in output directory, skip its clean in that case 1572resolve_btfids_clean: 1573ifneq ($(wildcard $(resolve_btfids_O)),) 1574 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1575endif 1576 1577PHONY += objtool_clean objtool_mrproper 1578 1579objtool_O = $(abspath $(objtree))/tools/objtool 1580 1581objtool_clean objtool_mrproper: 1582ifneq ($(wildcard $(objtool_O)),) 1583 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1584endif 1585 1586tools/: FORCE 1587 $(Q)mkdir -p $(objtree)/tools 1588 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1589 1590tools/%: FORCE 1591 $(Q)mkdir -p $(objtree)/tools 1592 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1593 1594# --------------------------------------------------------------------------- 1595# Kernel selftest 1596 1597PHONY += kselftest 1598kselftest: headers 1599 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1600 1601kselftest-%: headers FORCE 1602 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1603 1604PHONY += kselftest-merge 1605kselftest-merge: 1606 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1607 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1608 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1609 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1610 1611# --------------------------------------------------------------------------- 1612# Devicetree files 1613 1614ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1615dtstree := arch/$(SRCARCH)/boot/dts 1616endif 1617 1618dtbindingtree := Documentation/devicetree/bindings 1619 1620%.yaml: dtbs_prepare 1621 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1622 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1623 1624ifneq ($(dtstree),) 1625 1626%.dtb: dtbs_prepare 1627 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1628 1629%.dtbo: dtbs_prepare 1630 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1631 1632PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1633dtbs: dtbs_prepare 1634 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1635 1636# include/config/kernel.release is actually needed when installing DTBs because 1637# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1638# dtbs_install depend on it as dtbs_install may run as root. 1639dtbs_prepare: include/config/kernel.release scripts_dtc 1640 1641ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1642export CHECK_DTBS=y 1643endif 1644 1645ifneq ($(CHECK_DTBS),) 1646dtbs_prepare: dt_binding_schemas 1647endif 1648 1649dtbs_check: dtbs 1650 1651dtbs_install: 1652 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1653 1654ifdef CONFIG_OF_EARLY_FLATTREE 1655all: dtbs 1656endif 1657 1658ifdef CONFIG_GENERIC_BUILTIN_DTB 1659vmlinux: dtbs 1660endif 1661 1662endif 1663 1664PHONY += scripts_dtc 1665scripts_dtc: scripts_basic 1666 $(Q)$(MAKE) $(build)=scripts/dtc 1667 1668ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1669export CHECK_DTBS=y 1670endif 1671 1672PHONY += dt_binding_check dt_binding_schemas 1673dt_binding_check: dt_binding_schemas scripts_dtc 1674 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1675 1676dt_binding_schemas: 1677 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1678 1679PHONY += dt_compatible_check 1680dt_compatible_check: dt_binding_schemas 1681 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1682 1683PHONY += dt_style_selftest 1684dt_style_selftest: 1685 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1686 1687# --------------------------------------------------------------------------- 1688# Modules 1689 1690ifdef CONFIG_MODULES 1691 1692# By default, build modules as well 1693 1694all: modules 1695 1696# When we're building modules with modversions, we need to consider 1697# the built-in objects during the descend as well, in order to 1698# make sure the checksums are up to date before we record them. 1699ifdef CONFIG_MODVERSIONS 1700 KBUILD_BUILTIN := y 1701endif 1702 1703# Build modules 1704# 1705 1706# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1707# is an exception. 1708ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1709KBUILD_BUILTIN := y 1710modules: vmlinux 1711endif 1712 1713modules: modules_prepare 1714 1715# Target to prepare building external modules 1716modules_prepare: prepare 1717 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1718 1719endif # CONFIG_MODULES 1720 1721### 1722# Cleaning is done on three levels. 1723# make clean Delete most generated files 1724# Leave enough to build external modules 1725# make mrproper Delete the current configuration, and all generated files 1726# make distclean Remove editor backup files, patch leftover files and the like 1727 1728# Directories & files removed with 'make clean' 1729CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1730 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1731 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1732 vmlinux.thinlto-index builtin.order \ 1733 compile_commands.json rust/test \ 1734 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1735 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1736 1737# Directories & files removed with 'make mrproper' 1738MRPROPER_FILES += include/config include/generated \ 1739 arch/$(SRCARCH)/include/generated .objdiff \ 1740 debian snap tar-install PKGBUILD pacman \ 1741 .config .config.old .version \ 1742 Module.symvers \ 1743 certs/signing_key.pem \ 1744 certs/x509.genkey \ 1745 vmlinux-gdb.py \ 1746 rpmbuild \ 1747 rust/libmacros.so rust/libmacros.dylib \ 1748 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1749 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1750 1751# clean - Delete most, but leave enough to build external modules 1752# 1753clean: private rm-files := $(CLEAN_FILES) 1754 1755PHONY += archclean vmlinuxclean 1756 1757vmlinuxclean: 1758 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1759 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1760 1761clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1762 1763# mrproper - Delete all generated files, including .config 1764# 1765mrproper: private rm-files := $(MRPROPER_FILES) 1766mrproper-dirs := $(addprefix _mrproper_,scripts) 1767 1768PHONY += $(mrproper-dirs) mrproper 1769$(mrproper-dirs): 1770 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1771 1772mrproper: clean objtool_mrproper $(mrproper-dirs) 1773 $(call cmd,rmfiles) 1774 @find . $(RCS_FIND_IGNORE) \ 1775 \( -name '*.rmeta' \) \ 1776 -type f -print | xargs rm -f 1777 1778# distclean 1779# 1780PHONY += distclean 1781 1782distclean: mrproper 1783 @find . $(RCS_FIND_IGNORE) \ 1784 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1785 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1786 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1787 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1788 -type f -print | xargs rm -f 1789 1790 1791# Packaging of the kernel to various formats 1792# --------------------------------------------------------------------------- 1793 1794modules-cpio-pkg: usr_gen_init_cpio 1795 1796%src-pkg: FORCE 1797 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1798%pkg: include/config/kernel.release FORCE 1799 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1800 1801# Brief documentation of the typical targets used 1802# --------------------------------------------------------------------------- 1803 1804boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1805boards := $(sort $(notdir $(boards))) 1806board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1807board-dirs := $(sort $(notdir $(board-dirs:/=))) 1808 1809PHONY += help 1810help: 1811 @echo 'Cleaning targets:' 1812 @echo ' clean - Remove most generated files but keep the config and' 1813 @echo ' enough build support to build external modules' 1814 @echo ' mrproper - Remove all generated files + config + various backup files' 1815 @echo ' distclean - mrproper + remove editor backup and patch files' 1816 @echo '' 1817 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1818 @echo '' 1819 @echo 'Other generic targets:' 1820 @echo ' all - Build all targets marked with [*]' 1821 @echo '* vmlinux - Build the bare kernel' 1822 @echo '* modules - Build all modules' 1823 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1824 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1825 @echo ' dir/ - Build all files in dir and below' 1826 @echo ' dir/file.[ois] - Build specified target only' 1827 @echo ' dir/file.ll - Build the LLVM assembly file' 1828 @echo ' (requires compiler support for LLVM assembly generation)' 1829 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1830 @echo ' (requires a recent binutils and recent build (System.map))' 1831 @echo ' dir/file.ko - Build module including final link' 1832 @echo ' modules_prepare - Set up for building external modules' 1833 @echo ' tags/TAGS - Generate tags file for editors' 1834 @echo ' cscope - Generate cscope index' 1835 @echo ' gtags - Generate GNU GLOBAL index' 1836 @echo ' kernelrelease - Output the release version string (use with make -s)' 1837 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1838 @echo ' image_name - Output the image name (use with make -s)' 1839 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1840 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1841 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1842 echo '' 1843 @echo 'Static analysers:' 1844 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1845 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1846 @echo ' versioncheck - Sanity check on version.h usage' 1847 @echo ' includecheck - Check for duplicate included header files' 1848 @echo ' headerdep - Detect inclusion cycles in headers' 1849 @echo ' coccicheck - Check with Coccinelle' 1850 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1851 @echo ' clang-analyzer - Check with clang static analyzer' 1852 @echo ' clang-tidy - Check with clang-tidy' 1853 @echo '' 1854 @echo 'Tools:' 1855 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1856 @echo ' sbom - Generate Software Bill of Materials' 1857 @echo '' 1858 @echo 'Kernel selftest:' 1859 @echo ' kselftest - Build and run kernel selftest' 1860 @echo ' Build, install, and boot kernel before' 1861 @echo ' running kselftest on it' 1862 @echo ' Run as root for full coverage' 1863 @echo ' kselftest-all - Build kernel selftest' 1864 @echo ' kselftest-install - Build and install kernel selftest' 1865 @echo ' kselftest-clean - Remove all generated kselftest files' 1866 @echo ' kselftest-merge - Merge all the config dependencies of' 1867 @echo ' kselftest to existing .config.' 1868 @echo '' 1869 @echo 'Rust targets:' 1870 @echo ' rustavailable - Checks whether the Rust toolchain is' 1871 @echo ' available and, if not, explains why.' 1872 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1873 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1874 @echo ' is formatted, printing a diff otherwise.' 1875 @echo ' rustdoc - Generate Rust documentation' 1876 @echo ' (requires kernel .config)' 1877 @echo ' rusttest - Runs the Rust tests' 1878 @echo ' (requires kernel .config; downloads external repos)' 1879 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1880 @echo ' (requires kernel .config)' 1881 @echo ' dir/file.[os] - Build specified target only' 1882 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1883 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1884 @echo ' The output is not intended to be compilable.' 1885 @echo ' dir/file.ll - Build the LLVM assembly file' 1886 @echo '' 1887 @$(if $(dtstree), \ 1888 echo 'Devicetree:'; \ 1889 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1890 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1891 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1892 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1893 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1894 echo ' dtbs_check - Validate device tree source files';\ 1895 echo '') 1896 1897 @echo 'Userspace tools targets:' 1898 @echo ' use "make tools/help"' 1899 @echo ' or "cd tools; make help"' 1900 @echo '' 1901 @echo 'Kernel packaging:' 1902 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1903 @echo '' 1904 @echo 'Documentation targets:' 1905 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1906 @echo '' 1907 @echo 'Architecture-specific targets ($(SRCARCH)):' 1908 @$(or $(archhelp),\ 1909 echo ' No architecture-specific help defined for $(SRCARCH)') 1910 @echo '' 1911 @$(if $(boards), \ 1912 $(foreach b, $(boards), \ 1913 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1914 echo '') 1915 @$(if $(board-dirs), \ 1916 $(foreach b, $(board-dirs), \ 1917 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1918 printf " %-16s - Show all of the above\\n" help-boards; \ 1919 echo '') 1920 1921 @echo ' make V=n [targets] 1: verbose build' 1922 @echo ' 2: give reason for rebuild of target' 1923 @echo ' V=1 and V=2 can be combined with V=12' 1924 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1925 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1926 @echo ' (sparse by default)' 1927 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1928 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1929 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1930 @echo ' 1: warnings which may be relevant and do not occur too often' 1931 @echo ' 2: warnings which occur quite often but may still be relevant' 1932 @echo ' 3: more obscure warnings, can most likely be ignored' 1933 @echo ' c: extra checks in the configuration stage (Kconfig)' 1934 @echo ' e: warnings are being treated as errors' 1935 @echo ' Multiple levels can be combined with W=12 or W=123' 1936 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1937 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1938 @$(if $(dtstree), \ 1939 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1940 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1941 ) 1942 @echo '' 1943 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1944 @echo 'For further info see the ./README file' 1945 1946 1947help-board-dirs := $(addprefix help-,$(board-dirs)) 1948 1949help-boards: $(help-board-dirs) 1950 1951boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1952 1953$(help-board-dirs): help-%: 1954 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1955 @$(if $(boards-per-dir), \ 1956 $(foreach b, $(boards-per-dir), \ 1957 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1958 echo '') 1959 1960 1961# Documentation targets 1962# --------------------------------------------------------------------------- 1963DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1964 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1965 htmldocs-redirects 1966 1967PHONY += $(DOC_TARGETS) 1968$(DOC_TARGETS): 1969 $(Q)$(MAKE) $(build)=Documentation $@ 1970 1971 1972# Rust targets 1973# --------------------------------------------------------------------------- 1974 1975# "Is Rust available?" target 1976PHONY += rustavailable 1977rustavailable: 1978 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1979 1980# Documentation target 1981# 1982# Using the singular to avoid running afoul of `no-dot-config-targets`. 1983PHONY += rustdoc 1984rustdoc: prepare 1985 $(Q)$(MAKE) $(build)=rust $@ 1986 1987# Testing target 1988PHONY += rusttest 1989rusttest: prepare 1990 $(Q)$(MAKE) $(build)=rust $@ 1991 1992# Formatting targets 1993# 1994# Generated files as well as vendored crates are skipped. 1995PHONY += rustfmt rustfmtcheck 1996 1997rustfmt: 1998 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1999 \( \ 2000 -path $(srctree)/rust/proc-macro2 \ 2001 -o -path $(srctree)/rust/quote \ 2002 -o -path $(srctree)/rust/syn \ 2003 -o -path $(srctree)/rust/zerocopy \ 2004 -o -path $(srctree)/rust/zerocopy-derive \ 2005 \) -prune -o \ 2006 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2007 | xargs $(RUSTFMT) $(rustfmt_flags) 2008 2009rustfmtcheck: rustfmt_flags = --check 2010rustfmtcheck: rustfmt 2011 2012# Misc 2013# --------------------------------------------------------------------------- 2014 2015PHONY += misc-check 2016misc-check: 2017 $(Q)$(srctree)/scripts/misc-check 2018 2019all: misc-check 2020 2021PHONY += scripts_gdb 2022scripts_gdb: prepare0 2023 $(Q)$(MAKE) $(build)=scripts/gdb 2024 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2025 2026ifdef CONFIG_GDB_SCRIPTS 2027all: scripts_gdb 2028endif 2029 2030else # KBUILD_EXTMOD 2031 2032filechk_kernel.release = echo $(KERNELRELEASE) 2033 2034### 2035# External module support. 2036# When building external modules the kernel used as basis is considered 2037# read-only, and no consistency checks are made and the make 2038# system is not used on the basis kernel. If updates are required 2039# in the basis kernel ordinary make commands (without M=...) must be used. 2040 2041# We are always building only modules. 2042KBUILD_BUILTIN := 2043KBUILD_MODULES := y 2044 2045build-dir := . 2046 2047clean-dirs := . 2048clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2049 2050PHONY += prepare 2051# now expand this into a simple variable to reduce the cost of shell evaluations 2052prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2053prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2054prepare: 2055 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2056 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2057 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2058 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2059 fi 2060 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2061 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2062 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2063 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2064 fi 2065 2066PHONY += help 2067help: 2068 @echo ' Building external modules.' 2069 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2070 @echo '' 2071 @echo ' modules - default target, build the module(s)' 2072 @echo ' modules_install - install the module' 2073 @echo ' clean - remove generated files in module directory only' 2074 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2075 @echo '' 2076 2077ifndef CONFIG_MODULES 2078modules modules_install: __external_modules_error 2079__external_modules_error: 2080 @echo >&2 '***' 2081 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2082 @echo >&2 '*** You cannot build or install external modules.' 2083 @echo >&2 '***' 2084 @false 2085endif 2086 2087endif # KBUILD_EXTMOD 2088 2089# --------------------------------------------------------------------------- 2090# Modules 2091 2092PHONY += modules modules_install modules_sign modules_prepare 2093 2094modules_install: 2095 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2096 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2097 2098ifeq ($(CONFIG_MODULE_SIG),y) 2099# modules_sign is a subset of modules_install. 2100# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2101modules_sign: modules_install 2102 @: 2103else 2104modules_sign: 2105 @echo >&2 '***' 2106 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2107 @echo >&2 '***' 2108 @false 2109endif 2110 2111ifdef CONFIG_MODULES 2112 2113modules.order: $(build-dir) 2114 @: 2115 2116# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2117# This is solely useful to speed up test compiles. 2118modules: modpost 2119ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2121endif 2122 2123PHONY += modules_check 2124modules_check: modules.order 2125 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2126 2127else # CONFIG_MODULES 2128 2129modules: 2130 @: 2131 2132KBUILD_MODULES := 2133 2134endif # CONFIG_MODULES 2135 2136PHONY += modpost 2137modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2138 $(if $(KBUILD_MODULES), modules_check) 2139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2140 2141# Single targets 2142# --------------------------------------------------------------------------- 2143# To build individual files in subdirectories, you can do like this: 2144# 2145# make foo/bar/baz.s 2146# 2147# The supported suffixes for single-target are listed in 'single-targets' 2148# 2149# To build only under specific subdirectories, you can do like this: 2150# 2151# make foo/bar/baz/ 2152 2153ifdef single-build 2154 2155# .ko is special because modpost is needed 2156single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2157single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2158 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2159 2160$(single-ko): single_modules 2161 @: 2162$(single-no-ko): $(build-dir) 2163 @: 2164 2165# Remove modules.order when done because it is not the real one. 2166PHONY += single_modules 2167single_modules: $(single-no-ko) modules_prepare 2168 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2170ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2172endif 2173 $(Q)rm -f modules.order 2174 2175single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2176 2177KBUILD_MODULES := y 2178 2179endif 2180 2181prepare: outputmakefile 2182 2183# Preset locale variables to speed up the build process. Limit locale 2184# tweaks to this spot to avoid wrong language settings when running 2185# make menuconfig etc. 2186# Error messages still appears in the original language 2187PHONY += $(build-dir) 2188$(build-dir): prepare 2189 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2190 2191clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2192PHONY += $(clean-dirs) clean 2193$(clean-dirs): 2194 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2195 2196clean: $(clean-dirs) 2197 $(call cmd,rmfiles) 2198 @find . $(RCS_FIND_IGNORE) \ 2199 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2200 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2201 -o -name '*.dtb' -o -name '*.dtbo' \ 2202 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2203 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2204 -o -name '*.dwo' -o -name '*.lst' \ 2205 -o -name '*.su' -o -name '*.mod' \ 2206 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2207 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2208 -o -name '*.asn1.[ch]' \ 2209 -o -name '*.symtypes' -o -name 'modules.order' \ 2210 -o -name '*.c.[012]*.*' \ 2211 -o -name '*.ll' \ 2212 -o -name '*.gcno' \ 2213 -o -name '*.long-type-*.txt' \ 2214 \) -type f -print \ 2215 -o -name '.tmp_*' -print \ 2216 | xargs rm -rf 2217 2218# Generate tags for editors 2219# --------------------------------------------------------------------------- 2220quiet_cmd_tags = GEN $@ 2221 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2222 2223tags TAGS cscope gtags: FORCE 2224 $(call cmd,tags) 2225 2226# Generate rust-project.json (a file that describes the structure of non-Cargo 2227# Rust projects) for rust-analyzer (an implementation of the Language Server 2228# Protocol). 2229PHONY += rust-analyzer 2230rust-analyzer: 2231 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2232ifdef KBUILD_EXTMOD 2233# FIXME: external modules must not descend into a sub-directory of the kernel 2234 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2235else 2236 $(Q)$(MAKE) $(build)=rust $@ 2237endif 2238 2239# Script to generate missing namespace dependencies 2240# --------------------------------------------------------------------------- 2241 2242PHONY += nsdeps 2243nsdeps: export KBUILD_NSDEPS=1 2244nsdeps: modules 2245 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2246 2247# Script to generate .spdx.json SBOM documents describing the build 2248# --------------------------------------------------------------------------- 2249 2250ifdef building_out_of_srctree 2251sbom_targets := sbom-source.spdx.json 2252endif 2253sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2254quiet_cmd_sbom = GEN $(sbom_targets) 2255 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2256 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2257 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2258 --src-tree $(abspath $(srctree)) \ 2259 --obj-tree $(abspath $(objtree)) \ 2260 --roots-file "$(tmp-target)" \ 2261 --output-directory $(abspath $(objtree)) \ 2262 --generate-spdx \ 2263 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2264 --package-version "$(KERNELVERSION)" \ 2265 --write-output-on-error; 2266PHONY += sbom 2267sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2268 $(call cmd,sbom) 2269 2270# Clang Tooling 2271# --------------------------------------------------------------------------- 2272 2273quiet_cmd_gen_compile_commands = GEN $@ 2274 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2275 2276compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2277 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2278 $(if $(CONFIG_MODULES), modules.order) FORCE 2279 $(call if_changed,gen_compile_commands) 2280 2281targets += compile_commands.json 2282 2283PHONY += clang-tidy clang-analyzer 2284 2285ifdef CONFIG_CC_IS_CLANG 2286quiet_cmd_clang_tools = CHECK $< 2287 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2288 2289clang-tidy clang-analyzer: compile_commands.json 2290 $(call cmd,clang_tools) 2291else 2292clang-tidy clang-analyzer: 2293 @echo "$@ requires CC=clang" >&2 2294 @false 2295endif 2296 2297# Scripts to check various things for consistency 2298# --------------------------------------------------------------------------- 2299 2300PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2301 2302includecheck: 2303 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2304 -name '*.[hcS]' -type f -print | sort \ 2305 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2306 2307versioncheck: 2308 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2309 -name '*.[hcS]' -type f -print | sort \ 2310 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2311 2312coccicheck: 2313 $(Q)$(BASH) $(srctree)/scripts/$@ 2314 2315kconfig-sym-check: 2316 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2317 2318PHONY += checkstack kernelrelease kernelversion image_name 2319 2320# UML needs a little special treatment here. It wants to use the host 2321# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2322# else wants $(ARCH), including people doing cross-builds, which means 2323# that $(SUBARCH) doesn't work here. 2324ifeq ($(ARCH), um) 2325CHECKSTACK_ARCH := $(SUBARCH) 2326else 2327CHECKSTACK_ARCH := $(ARCH) 2328endif 2329MINSTACKSIZE ?= 100 2330checkstack: 2331 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2332 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2333 2334kernelrelease: 2335 @$(filechk_kernel.release) 2336 2337kernelversion: 2338 @echo $(KERNELVERSION) 2339 2340image_name: 2341 @echo $(KBUILD_IMAGE) 2342 2343PHONY += run-command 2344run-command: 2345 $(Q)$(KBUILD_RUN_COMMAND) 2346 2347quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2348 cmd_rmfiles = rm -rf $(rm-files) 2349 2350# read saved command lines for existing targets 2351existing-targets := $(wildcard $(sort $(targets))) 2352 2353-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2354 2355endif # config-build 2356endif # mixed-build 2357endif # need-sub-make 2358 2359PHONY += FORCE 2360FORCE: 2361 2362# Declare the contents of the PHONY variable as phony. We keep that 2363# information in a variable so we can use it in if_changed and friends. 2364.PHONY: $(PHONY) 2365