1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 kconfig-sym-check \ 297 $(version_h) headers headers_% archheaders archscripts \ 298 %asm-generic kernelversion %src-pkg dt_binding_check \ 299 dt_style_selftest \ 300 outputmakefile rustavailable rustfmt rustfmtcheck \ 301 scripts_gen_init_cpio \ 302 run-command 303no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 304 image_name 305single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.header-check %/ 306 307config-build := 308mixed-build := 309need-config := 1 310may-sync-config := 1 311single-build := 312 313ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 314 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 315 need-config := 316 endif 317endif 318 319ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 320 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 321 may-sync-config := 322 endif 323endif 324 325need-compiler := $(may-sync-config) 326 327ifneq ($(KBUILD_EXTMOD),) 328 may-sync-config := 329endif 330 331ifeq ($(KBUILD_EXTMOD),) 332 ifneq ($(filter %config,$(MAKECMDGOALS)),) 333 config-build := 1 334 ifneq ($(words $(MAKECMDGOALS)),1) 335 mixed-build := 1 336 endif 337 endif 338endif 339 340# We cannot build single targets and the others at the same time 341ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 342 single-build := 1 343 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 344 mixed-build := 1 345 endif 346endif 347 348# For "make -j clean all", "make -j mrproper defconfig all", etc. 349ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 350 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 351 mixed-build := 1 352 endif 353endif 354 355# install and modules_install need also be processed one by one 356ifneq ($(filter install,$(MAKECMDGOALS)),) 357 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 358 mixed-build := 1 359 endif 360endif 361 362ifdef mixed-build 363# =========================================================================== 364# We're called with mixed targets (*config and build targets). 365# Handle them one by one. 366 367PHONY += $(MAKECMDGOALS) __build_one_by_one 368 369$(MAKECMDGOALS): __build_one_by_one 370 @: 371 372__build_one_by_one: 373 $(Q)set -e; \ 374 for i in $(MAKECMDGOALS); do \ 375 $(MAKE) -f $(srctree)/Makefile $$i; \ 376 done 377 378else # !mixed-build 379 380include $(srctree)/scripts/Kbuild.include 381 382# Read KERNELRELEASE from include/config/kernel.release (if it exists) 383KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 384KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 385export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 386 387include $(srctree)/scripts/subarch.include 388 389# Cross compiling and selecting different set of gcc/bin-utils 390# --------------------------------------------------------------------------- 391# 392# When performing cross compilation for other architectures ARCH shall be set 393# to the target architecture. (See arch/* for the possibilities). 394# ARCH can be set during invocation of make: 395# make ARCH=arm64 396# Another way is to have ARCH set in the environment. 397# The default ARCH is the host where make is executed. 398 399# CROSS_COMPILE specify the prefix used for all executables used 400# during compilation. Only gcc and related bin-utils executables 401# are prefixed with $(CROSS_COMPILE). 402# CROSS_COMPILE can be set on the command line 403# make CROSS_COMPILE=aarch64-linux-gnu- 404# Alternatively CROSS_COMPILE can be set in the environment. 405# Default value for CROSS_COMPILE is not to prefix executables 406# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 407ARCH ?= $(SUBARCH) 408 409# Architecture as present in compile.h 410UTS_MACHINE := $(ARCH) 411SRCARCH := $(ARCH) 412 413# Additional ARCH settings for x86 414ifeq ($(ARCH),i386) 415 SRCARCH := x86 416endif 417ifeq ($(ARCH),x86_64) 418 SRCARCH := x86 419endif 420 421# Additional ARCH settings for sparc 422ifeq ($(ARCH),sparc32) 423 SRCARCH := sparc 424endif 425ifeq ($(ARCH),sparc64) 426 SRCARCH := sparc 427endif 428 429# Additional ARCH settings for parisc 430ifeq ($(ARCH),parisc64) 431 SRCARCH := parisc 432endif 433 434export cross_compiling := 435ifneq ($(SRCARCH),$(SUBARCH)) 436cross_compiling := 1 437endif 438 439KCONFIG_CONFIG ?= .config 440export KCONFIG_CONFIG 441 442# SHELL used by kbuild 443CONFIG_SHELL := sh 444 445HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 446HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 447HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 448 449ifneq ($(LLVM),) 450ifneq ($(filter %/,$(LLVM)),) 451LLVM_PREFIX := $(LLVM) 452else ifneq ($(filter -%,$(LLVM)),) 453LLVM_SUFFIX := $(LLVM) 454else ifneq ($(LLVM),1) 455$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 456endif 457 458HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 459HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 460else 461HOSTCC = gcc 462HOSTCXX = g++ 463endif 464HOSTRUSTC = rustc 465HOSTPKG_CONFIG = pkg-config 466 467# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 468# has a logic to call it 469KERNELDOC = $(srctree)/tools/docs/kernel-doc 470export KERNELDOC 471 472KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 473 -O2 -fomit-frame-pointer -std=gnu11 474KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 475KBUILD_USERLDFLAGS := $(USERLDFLAGS) 476 477# These flags apply to all Rust code in the tree, including the kernel and 478# host programs. 479# 480# `-Aclippy::unwrap_or_default`: the lint is buggy [1] and ignores our 481# MSRV. It can trigger depending on the optimization level. 482# [1] https://github.com/rust-lang/rust-clippy/issues/17379 483export rust_common_flags := --edition=2021 \ 484 -Zbinary_dep_depinfo=y \ 485 -Astable_features \ 486 -Aunused_features \ 487 -Dnon_ascii_idents \ 488 -Dunsafe_op_in_unsafe_fn \ 489 -Wmissing_docs \ 490 -Wrust_2018_idioms \ 491 -Wunreachable_pub \ 492 -Wclippy::all \ 493 -Wclippy::as_ptr_cast_mut \ 494 -Wclippy::as_underscore \ 495 -Wclippy::cast_lossless \ 496 -Aclippy::collapsible_if \ 497 -Aclippy::collapsible_match \ 498 -Wclippy::ignored_unit_patterns \ 499 -Aclippy::incompatible_msrv \ 500 -Wclippy::mut_mut \ 501 -Wclippy::needless_bitwise_bool \ 502 -Aclippy::needless_lifetimes \ 503 -Wclippy::no_mangle_with_rust_abi \ 504 -Wclippy::ptr_as_ptr \ 505 -Wclippy::ptr_cast_constness \ 506 -Wclippy::ref_as_ptr \ 507 -Wclippy::undocumented_unsafe_blocks \ 508 -Aclippy::uninlined_format_args \ 509 -Wclippy::unnecessary_safety_comment \ 510 -Wclippy::unnecessary_safety_doc \ 511 -Aclippy::unwrap_or_default \ 512 -Wrustdoc::missing_crate_level_docs \ 513 -Wrustdoc::unescaped_backticks 514 515KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 516 $(HOSTCFLAGS) -I $(srctree)/scripts/include 517KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 518 -I $(srctree)/scripts/include 519KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 520 -Zallow-features= 521KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 522KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 523KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 524 525# Make variables (CC, etc...) 526CPP = $(CC) -E 527ifneq ($(LLVM),) 528CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 529LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 530AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 531LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 532NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 533OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 534OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 535READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 536STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 537ifeq ($(filter -fuse-ld=% --ld-path=%,$(KBUILD_HOSTLDFLAGS)),) 538KBUILD_HOSTLDFLAGS += -fuse-ld=lld 539endif 540else 541CC = $(CROSS_COMPILE)gcc 542LD = $(CROSS_COMPILE)ld 543AR = $(CROSS_COMPILE)ar 544NM = $(CROSS_COMPILE)nm 545OBJCOPY = $(CROSS_COMPILE)objcopy 546OBJDUMP = $(CROSS_COMPILE)objdump 547READELF = $(CROSS_COMPILE)readelf 548STRIP = $(CROSS_COMPILE)strip 549endif 550RUSTC = rustc 551RUSTDOC = rustdoc 552RUSTFMT = rustfmt 553CLIPPY_DRIVER = clippy-driver 554BINDGEN = bindgen 555PAHOLE = pahole 556RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 557LEX = flex 558YACC = bison 559AWK = awk 560INSTALLKERNEL := installkernel 561PERL = perl 562PYTHON3 = python3 563CHECK = sparse 564BASH = bash 565KGZIP = gzip 566KBZIP2 = bzip2 567KLZOP = lzop 568LZMA = lzma 569LZ4 = lz4 570XZ = xz 571ZSTD = zstd 572TAR = tar 573 574CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 575 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 576NOSTDINC_FLAGS := 577CFLAGS_MODULE = 578RUSTFLAGS_MODULE = 579AFLAGS_MODULE = 580LDFLAGS_MODULE = 581CFLAGS_KERNEL = 582RUSTFLAGS_KERNEL = 583AFLAGS_KERNEL = 584LDFLAGS_vmlinux = 585 586# Use USERINCLUDE when you must reference the UAPI directories only. 587USERINCLUDE := \ 588 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 589 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 590 -I$(srctree)/include/uapi \ 591 -I$(objtree)/include/generated/uapi \ 592 -include $(srctree)/include/linux/compiler-version.h \ 593 -include $(srctree)/include/linux/kconfig.h 594 595# Use LINUXINCLUDE when you must reference the include/ directory. 596# Needed to be compatible with the O= option 597LINUXINCLUDE := \ 598 -I$(srctree)/arch/$(SRCARCH)/include \ 599 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 600 -I$(srctree)/include \ 601 -I$(objtree)/include \ 602 $(USERINCLUDE) 603 604KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 605 606KBUILD_CFLAGS := 607KBUILD_CFLAGS += -fshort-wchar 608KBUILD_CFLAGS += -funsigned-char 609KBUILD_CFLAGS += -fno-common 610KBUILD_CFLAGS += -fno-PIE 611KBUILD_CFLAGS += -fno-strict-aliasing 612 613KBUILD_CPPFLAGS := -D__KERNEL__ 614KBUILD_RUSTFLAGS := $(rust_common_flags) \ 615 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 616 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 617 -Csymbol-mangling-version=v0 \ 618 -Crelocation-model=static \ 619 -Zfunction-sections=n \ 620 -Wclippy::float_arithmetic 621KBUILD_RUSTFLAGS_OPTION_CHKS := 622 623KBUILD_AFLAGS_KERNEL := 624KBUILD_CFLAGS_KERNEL := 625KBUILD_RUSTFLAGS_KERNEL := 626KBUILD_AFLAGS_MODULE := -DMODULE 627KBUILD_CFLAGS_MODULE := -DMODULE 628KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 629KBUILD_LDFLAGS_MODULE := 630KBUILD_LDFLAGS := 631CLANG_FLAGS := 632 633ifeq ($(KBUILD_CLIPPY),1) 634 RUSTC_OR_CLIPPY_QUIET := CLIPPY 635 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 636else 637 RUSTC_OR_CLIPPY_QUIET := RUSTC 638 RUSTC_OR_CLIPPY = $(RUSTC) 639endif 640 641# Allows the usage of unstable features in stable compilers. 642export RUSTC_BOOTSTRAP := 1 643 644# Allows finding `.clippy.toml` in out-of-srctree builds. 645export CLIPPY_CONF_DIR := $(srctree) 646 647export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 648export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 649export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 650export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 651export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 652export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 653export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 654export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 655 656export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 657export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 658export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 659export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 660export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 661export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 662 663# Files to ignore in find ... statements 664 665export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 666 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 667 -prune -o 668 669# =========================================================================== 670# Rules shared between *config targets and build targets 671 672# Basic helpers built in scripts/basic/ 673PHONY += scripts_basic 674scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 675scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 676scripts_basic: 677 $(Q)$(MAKE) $(build)=scripts/basic 678 679PHONY += outputmakefile 680ifdef building_out_of_srctree 681# Before starting out-of-tree build, make sure the source tree is clean. 682# outputmakefile generates a Makefile in the output directory, if using a 683# separate output directory. This allows convenient use of make in the 684# output directory. 685# At the same time as the output Makefile is generated, generate .gitignore to 686# ignore the whole output directory 687 688ifdef KBUILD_EXTMOD 689print_env_for_makefile = \ 690 echo "export KBUILD_OUTPUT = $(objtree)"; \ 691 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 692 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 693else 694print_env_for_makefile = \ 695 echo "export KBUILD_OUTPUT = $(CURDIR)" 696endif 697 698filechk_makefile = { \ 699 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 700 $(print_env_for_makefile); \ 701 echo "include $(abs_srctree)/Makefile"; \ 702 } 703 704PHONY += $(CURDIR)/Makefile 705$(CURDIR)/Makefile: FORCE 706 $(call filechk,makefile) 707 708outputmakefile: $(CURDIR)/Makefile 709ifeq ($(KBUILD_EXTMOD),) 710 @if [ -f $(srctree)/.config -o \ 711 -d $(srctree)/include/config -o \ 712 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 713 echo >&2 "***"; \ 714 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 715 echo >&2 "*** in $(abs_srctree)";\ 716 echo >&2 "***"; \ 717 false; \ 718 fi 719else 720 @if [ -f $(srcroot)/modules.order ]; then \ 721 echo >&2 "***"; \ 722 echo >&2 "*** The external module source tree is not clean."; \ 723 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 724 echo >&2 "***"; \ 725 false; \ 726 fi 727endif 728 $(Q)ln -fsn $(srcroot) source 729 $(Q)test -e .gitignore || \ 730 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 731endif 732 733# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 734# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 735# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 736# Kconfig (so they need export), and from include/config/auto.conf.cmd to 737# detect the version changes between builds. 738CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 739RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 740PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 741 742ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 743include $(srctree)/scripts/Makefile.clang 744endif 745 746# Include this also for config targets because some architectures need 747# cc-cross-prefix to determine CROSS_COMPILE. 748ifdef need-compiler 749include $(srctree)/scripts/Makefile.compiler 750endif 751 752ifdef config-build 753# =========================================================================== 754# *config targets only - make sure prerequisites are updated, and descend 755# in scripts/kconfig to make the *config target 756 757# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 758# KBUILD_DEFCONFIG may point out an alternative default configuration 759# used for 'make defconfig' 760include $(srctree)/arch/$(SRCARCH)/Makefile 761export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 762 763config: outputmakefile scripts_basic FORCE 764 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 765 766%config: outputmakefile scripts_basic FORCE 767 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 768 769else #!config-build 770# =========================================================================== 771# Build targets only - this includes vmlinux, arch-specific targets, clean 772# targets and others. In general all targets except *config targets. 773 774# If building an external module we do not care about the all: rule 775# but instead __all depend on modules 776PHONY += all 777ifeq ($(KBUILD_EXTMOD),) 778__all: all 779else 780__all: modules 781endif 782 783targets := 784 785# Decide whether to build built-in, modular, or both. 786# Normally, just do built-in. 787 788KBUILD_MODULES := 789KBUILD_BUILTIN := y 790 791# If we have only "make modules", don't compile built-in objects. 792ifeq ($(MAKECMDGOALS),modules) 793 KBUILD_BUILTIN := 794endif 795 796# If we have "make <whatever> modules", compile modules 797# in addition to whatever we do anyway. 798# Just "make" or "make all" shall build modules as well 799 800ifneq ($(filter all modules nsdeps compile_commands.json clang-% sbom,$(MAKECMDGOALS)),) 801 KBUILD_MODULES := y 802endif 803 804ifeq ($(MAKECMDGOALS),) 805 KBUILD_MODULES := y 806endif 807 808export KBUILD_MODULES KBUILD_BUILTIN 809 810ifdef need-config 811include $(objtree)/include/config/auto.conf 812endif 813 814CC_FLAGS_DIALECT := -std=gnu11 815# Allow including a tagged struct or union anonymously in another struct/union. 816CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 817# Clang enables warnings about GNU and Microsoft extensions by default, disable 818# them because this is expected with the above options. 819ifdef CONFIG_CC_IS_CLANG 820CC_FLAGS_DIALECT += -Wno-gnu 821CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 822endif 823export CC_FLAGS_DIALECT 824KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 825 826ifeq ($(KBUILD_EXTMOD),) 827# Objects we will link into vmlinux / subdirs we need to visit 828core-y := 829drivers-y := 830libs-y := lib/ 831endif # KBUILD_EXTMOD 832 833# The all: target is the default when no target is given on the 834# command line. 835# This allow a user to issue only 'make' to build a kernel including modules 836# Defaults to vmlinux, but the arch makefile usually adds further targets 837all: vmlinux 838 839# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 840ifdef CONFIG_FUNCTION_TRACER 841 CC_FLAGS_FTRACE := -pg 842endif 843 844ifdef CONFIG_TRACEPOINTS 845# To check for unused tracepoints (tracepoints that are defined but never 846# called), run with: 847# 848# make UT=1 849# 850# Each unused tracepoints can take up to 5KB of memory in the running kernel. 851# It is best to remove any that are not used. 852# 853# This command line option will be removed when all current unused 854# tracepoints are removed. 855 856ifeq ("$(origin UT)", "command line") 857 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 858endif 859endif # CONFIG_TRACEPOINTS 860 861export WARN_ON_UNUSED_TRACEPOINTS 862 863# Per-version Rust flags. These are like `rust_common_flags`, but may 864# depend on the Rust compiler version (e.g. using `rustc-min-version`). 865# 866# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 867# include bitmasking and shift operations. However, because it generated 868# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 869# lint which is not enabled by default. 870rust_common_flags_per_version := \ 871 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 872 873rust_common_flags += $(rust_common_flags_per_version) 874KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 875KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 876 877include $(srctree)/arch/$(SRCARCH)/Makefile 878 879ifdef need-config 880ifdef may-sync-config 881# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 882# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 883# because some architectures define CROSS_COMPILE there. 884include include/config/auto.conf.cmd 885 886$(KCONFIG_CONFIG): 887 @echo >&2 '***' 888 @echo >&2 '*** Configuration file "$@" not found!' 889 @echo >&2 '***' 890 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 891 @echo >&2 '*** "make menuconfig" or "make xconfig").' 892 @echo >&2 '***' 893 @/bin/false 894 895# The actual configuration files used during the build are stored in 896# include/generated/ and include/config/. Update them if .config is newer than 897# include/config/auto.conf (which mirrors .config). 898# 899# This exploits the 'multi-target pattern rule' trick. 900# The syncconfig should be executed only once to make all the targets. 901# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 902# 903# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 904# so you cannot notice that Kconfig is waiting for the user input. 905%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 906 $(Q)$(kecho) " SYNC $@" 907 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 908else # !may-sync-config 909# External modules and some install targets need include/generated/autoconf.h 910# and include/config/auto.conf but do not care if they are up-to-date. 911# Use auto.conf to show the error message 912 913checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 914missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 915 916ifdef missing-configs 917PHONY += $(objtree)/include/config/auto.conf 918 919$(objtree)/include/config/auto.conf: 920 @echo >&2 '***' 921 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 922 @printf >&2 '*** - %s\n' $(missing-configs) 923 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 924 @echo >&2 '***' 925 @/bin/false 926endif 927 928endif # may-sync-config 929endif # need-config 930 931KBUILD_CFLAGS += -fno-delete-null-pointer-checks 932 933ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 934KBUILD_CFLAGS += -O2 935KBUILD_RUSTFLAGS += -Copt-level=2 936else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 937KBUILD_CFLAGS += -Os 938KBUILD_RUSTFLAGS += -Copt-level=s 939endif 940 941# Always set `debug-assertions` and `overflow-checks` because their default 942# depends on `opt-level` and `debug-assertions`, respectively. 943KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 944KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 945 946# Tell gcc to never replace conditional load with a non-conditional one 947ifdef CONFIG_CC_IS_GCC 948# gcc-10 renamed --param=allow-store-data-races=0 to 949# -fno-allow-store-data-races. 950KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 951KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 952endif 953 954ifdef CONFIG_READABLE_ASM 955# Disable optimizations that make assembler listings hard to read. 956# reorder blocks reorders the control in the function 957# ipa clone creates specialized cloned functions 958# partial inlining inlines only parts of functions 959KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 960endif 961 962stackp-flags-y := -fno-stack-protector 963stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 964stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 965 966KBUILD_CFLAGS += $(stackp-flags-y) 967 968ifdef CONFIG_FRAME_POINTER 969KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 970KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 971# Work around rustc bug on compilers without 972# https://github.com/rust-lang/rust/pull/156980. 973KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=frame-pointer:u32:2:max) 974else 975# Some targets (ARM with Thumb2, for example), can't be built with frame 976# pointers. For those, we don't have FUNCTION_TRACER automatically 977# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 978# incompatible with -fomit-frame-pointer with current GCC, so we don't use 979# -fomit-frame-pointer with FUNCTION_TRACER. 980# In the Rust target specification, "frame-pointer" is set explicitly 981# to "may-omit". 982ifndef CONFIG_FUNCTION_TRACER 983KBUILD_CFLAGS += -fomit-frame-pointer 984endif 985endif 986 987# Initialize all stack variables with a 0xAA pattern. 988ifdef CONFIG_INIT_STACK_ALL_PATTERN 989KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 990endif 991 992# Initialize all stack variables with a zero value. 993ifdef CONFIG_INIT_STACK_ALL_ZERO 994KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 995ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 996# https://github.com/llvm/llvm-project/issues/44842 997CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 998export CC_AUTO_VAR_INIT_ZERO_ENABLER 999KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 1000endif 1001endif 1002 1003ifdef CONFIG_KMALLOC_PARTITION_TYPED 1004# KMALLOC_PARTITION_CACHES_NR + 1 1005KBUILD_CFLAGS += -falloc-token-max=16 1006endif 1007 1008ifdef CONFIG_CC_IS_CLANG 1009ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1010KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1011endif 1012endif 1013 1014# Explicitly clear padding bits during variable initialization 1015KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1016 1017# While VLAs have been removed, GCC produces unreachable stack probes 1018# for the randomize_kstack_offset feature. Disable it for all compilers. 1019KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1020 1021# Get details on warnings generated due to GCC value tracking. 1022KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1023 1024# Show inlining notes for __attribute__((warning/error)) call chains. 1025# GCC supports this unconditionally while Clang 23+ provides a flag. 1026KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1027 1028# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1029ifdef CONFIG_ZERO_CALL_USED_REGS 1030KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1031endif 1032 1033ifdef CONFIG_FUNCTION_TRACER 1034ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1035 CC_FLAGS_FTRACE += -mrecord-mcount 1036 ifdef CONFIG_HAVE_NOP_MCOUNT 1037 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1038 CC_FLAGS_FTRACE += -mnop-mcount 1039 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1040 endif 1041 endif 1042endif 1043ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1044 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1045 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1046 endif 1047endif 1048ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1049 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1050 BUILD_C_RECORDMCOUNT := y 1051 export BUILD_C_RECORDMCOUNT 1052 endif 1053endif 1054ifdef CONFIG_HAVE_FENTRY 1055 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1056 ifeq ($(call cc-option-yn, -mfentry),y) 1057 CC_FLAGS_FTRACE += -mfentry 1058 CC_FLAGS_USING += -DCC_USING_FENTRY 1059 endif 1060endif 1061export CC_FLAGS_FTRACE 1062KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1063KBUILD_AFLAGS += $(CC_FLAGS_USING) 1064endif 1065 1066# We trigger additional mismatches with less inlining 1067ifdef CONFIG_DEBUG_SECTION_MISMATCH 1068KBUILD_CFLAGS += -fno-inline-functions-called-once 1069endif 1070 1071# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1072ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1073KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1074KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1075LDFLAGS_vmlinux += --gc-sections 1076endif 1077 1078ifdef CONFIG_SHADOW_CALL_STACK 1079ifndef CONFIG_DYNAMIC_SCS 1080CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1081KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1082KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1083endif 1084export CC_FLAGS_SCS 1085endif 1086 1087ifdef CONFIG_RUST_INLINE_HELPERS 1088# `rustc` normally emits traps for unreachable paths during code generation. 1089# With inline helpers, Clang performs code generation from the linked bitcode 1090# instead, so request the same behavior explicitly. Otherwise `objtool` may 1091# follow an impossible Rust path into the next function. 1092CC_FLAGS_RUST_INLINE_HELPERS := -mllvm -trap-unreachable \ 1093 -mllvm -no-trap-after-noreturn 1094export CC_FLAGS_RUST_INLINE_HELPERS 1095endif 1096 1097ifdef CONFIG_LTO_CLANG 1098ifdef CONFIG_LTO_CLANG_FULL 1099CC_FLAGS_LTO := -flto 1100else 1101CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1102 1103# These LLVM options were initially added with only in-process ThinLTO 1104# support, so avoid distributed ThinLTO support for now. 1105ifdef CONFIG_LTO_CLANG_THIN 1106KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1107endif 1108endif 1109CC_FLAGS_LTO += -fvisibility=hidden 1110 1111# Limit inlining across translation units to reduce binary size 1112KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1113endif 1114 1115ifdef CONFIG_LTO 1116KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1117KBUILD_AFLAGS += -fno-lto 1118export CC_FLAGS_LTO 1119endif 1120 1121ifdef CONFIG_CFI 1122CC_FLAGS_CFI := -fsanitize=kcfi 1123ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1124 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1125endif 1126ifdef CONFIG_FINEIBT_BHI 1127 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1128endif 1129ifdef CONFIG_RUST 1130 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1131 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1132 # Disable function merging as LLVM incorrectly merges functions with different KCFI types. 1133 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers -Zmerge-functions=disabled 1134 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1135 export RUSTC_FLAGS_CFI 1136endif 1137KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1138export CC_FLAGS_CFI 1139endif 1140 1141# Architectures can define flags to add/remove for floating-point support 1142CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1143export CC_FLAGS_FPU 1144export CC_FLAGS_NO_FPU 1145 1146ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1147# Set the minimal function alignment. Use the newer GCC option 1148# -fmin-function-alignment if it is available, or fall back to -falign-functions. 1149# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1150ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1151KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1152else 1153KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1154endif 1155endif 1156 1157# arch Makefile may override CC so keep this after arch Makefile is included 1158NOSTDINC_FLAGS += -nostdinc 1159 1160# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1161# the kernel uses only C99 flexible arrays for dynamically sized trailing 1162# arrays. Enforce this for everything that may examine structure sizes and 1163# perform bounds checking. 1164KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1165 1166# disable invalid "can't wrap" optimizations for signed / pointers 1167KBUILD_CFLAGS += -fno-strict-overflow 1168 1169# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1170KBUILD_CFLAGS += -fno-stack-check 1171 1172# conserve stack if available 1173ifdef CONFIG_CC_IS_GCC 1174KBUILD_CFLAGS += -fconserve-stack 1175endif 1176 1177# Ensure compilers do not transform certain loops into calls to wcslen() 1178KBUILD_CFLAGS += -fno-builtin-wcslen 1179 1180CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1181ifdef CONFIG_CC_IS_GCC 1182CFLAGS_GCOV += -fno-tree-loop-im 1183# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1184# Only enable if -fprofile-update=prefer-atomic does not introduce new 1185# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1186CFLAGS_GCOV += $(call try-run,\ 1187 echo 'long long x; void f(void){x++;}' | \ 1188 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1189 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1190 echo 'long long x; void f(void){x++;}' | \ 1191 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1192 -ftest-coverage -fprofile-update=prefer-atomic \ 1193 -x c - -c -o "$$TMP" && \ 1194 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1195 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1196 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1197 -fprofile-update=prefer-atomic) 1198endif 1199export CFLAGS_GCOV 1200 1201# change __FILE__ to the relative path to the source directory 1202ifdef building_out_of_srctree 1203CFLAGS_PREFIX_MAP := -fmacro-prefix-map=$(srcroot)/= 1204KBUILD_CPPFLAGS += $(CFLAGS_PREFIX_MAP) 1205KBUILD_USERCFLAGS += $(CFLAGS_PREFIX_MAP) 1206KBUILD_HOSTCFLAGS += $(CFLAGS_PREFIX_MAP) 1207ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1208KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1209endif 1210endif 1211 1212# include additional Makefiles when needed 1213include-y := scripts/Makefile.warn 1214include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1215include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1216include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1217include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1218include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1219include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1220include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1221include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1222include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1223include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1224include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1225include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1226include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1227 1228include $(addprefix $(srctree)/, $(include-y)) 1229 1230# scripts/Makefile.gcc-plugins is intentionally included last. 1231# Do not add $(call cc-option,...) below this line. When you build the kernel 1232# from the clean source tree, the GCC plugins do not exist at this point. 1233 1234# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1235KBUILD_CPPFLAGS += $(KCPPFLAGS) 1236KBUILD_AFLAGS += $(KAFLAGS) 1237KBUILD_CFLAGS += $(KCFLAGS) 1238KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1239 1240KBUILD_LDFLAGS_MODULE += --build-id=sha1 1241LDFLAGS_vmlinux += --build-id=sha1 1242 1243# Specific code, such as outlined KASAN checks, may be placed in 1244# COMDAT-deduplicated sections. Use --force-group-allocation to resolve these 1245# groups when linking modules. The option is available from ld.bfd 2.29 and 1246# ld.lld 19.1.0. 1247KBUILD_LDFLAGS_MODULE += $(call ld-option,--force-group-allocation) 1248 1249KBUILD_LDFLAGS += -z noexecstack 1250ifeq ($(CONFIG_LD_IS_BFD),y) 1251KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1252endif 1253 1254ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1255LDFLAGS_vmlinux += -X 1256endif 1257 1258ifeq ($(CONFIG_RELR),y) 1259# ld.lld before 15 did not support -z pack-relative-relocs. 1260LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1261endif 1262 1263# We never want expected sections to be placed heuristically by the 1264# linker. All sections should be explicitly named in the linker script. 1265ifdef CONFIG_LD_ORPHAN_WARN 1266LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1267endif 1268 1269ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1270LDFLAGS_vmlinux += --emit-relocs --discard-none 1271endif 1272 1273# Align the architecture of userspace programs with the kernel 1274USERFLAGS_FROM_KERNEL := --target=% 1275 1276ifdef CONFIG_ARCH_USERFLAGS 1277KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1278KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1279else 1280# If not overridden also inherit the bit size 1281USERFLAGS_FROM_KERNEL += -m32 -m64 1282endif 1283 1284KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1285KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1286 1287# userspace programs are linked via the compiler, use the correct linker 1288ifdef CONFIG_CC_IS_CLANG 1289KBUILD_USERLDFLAGS += --ld-path=$(LD) 1290endif 1291 1292# make the checker run with the right architecture 1293CHECKFLAGS += --arch=$(ARCH) 1294 1295# insure the checker run with the right endianness 1296CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1297 1298# the checker needs the correct machine size 1299CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1300 1301# Validate the checker is available and functional 1302ifneq ($(KBUILD_CHECKSRC), 0) 1303 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1304 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1305 KBUILD_CHECKSRC = 0 1306 endif 1307endif 1308 1309# Default kernel image to build when no specific target is given. 1310# KBUILD_IMAGE may be overruled on the command line or 1311# set in the environment 1312# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1313# this default value 1314export KBUILD_IMAGE ?= vmlinux 1315 1316# 1317# INSTALL_PATH specifies where to place the updated kernel and system map 1318# images. Default is /boot, but you can set it to other values 1319export INSTALL_PATH ?= /boot 1320 1321# 1322# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1323# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1324# an argument if needed. Otherwise it defaults to the kernel install path 1325# 1326export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1327 1328# 1329# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1330# relocations required by build roots. This is not defined in the 1331# makefile but the argument can be passed to make if needed. 1332# 1333 1334MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1335export MODLIB 1336 1337PHONY += prepare0 1338 1339ifeq ($(KBUILD_EXTMOD),) 1340 1341build-dir := . 1342clean-dirs := $(sort . Documentation \ 1343 $(patsubst %/,%,$(filter %/, $(core-) \ 1344 $(drivers-) $(libs-)))) 1345 1346export ARCH_CORE := $(core-y) 1347export ARCH_LIB := $(filter %/, $(libs-y)) 1348export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1349# Externally visible symbols (used by link-vmlinux.sh) 1350 1351KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1352KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1353 1354export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1355export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1356 1357ifdef CONFIG_TRIM_UNUSED_KSYMS 1358# For the kernel to actually contain only the needed exported symbols, 1359# we have to build modules as well to determine what those symbols are. 1360KBUILD_MODULES := y 1361endif 1362 1363PHONY += vmlinux_a 1364vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1365 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1366 1367vmlinux.a: vmlinux_a 1368 @: 1369 1370PHONY += vmlinux_o 1371vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1372 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1373 1374vmlinux.o: vmlinux_o 1375 @: 1376 1377PHONY += vmlinux 1378# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1379# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1380# unrelated; the decompressors just happen to have the same base name, 1381# arch/*/boot/compressed/vmlinux. 1382# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1383# 1384# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1385# https://savannah.gnu.org/bugs/?61463 1386# For Make > 4.4, the following simple code will work: 1387# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1388vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1389vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1390vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1392 1393# The actual objects are generated when descending, 1394# make sure no implicit rule kicks in 1395$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1396 1397ifeq ($(origin KERNELRELEASE),file) 1398filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1399else 1400filechk_kernel.release = echo $(KERNELRELEASE) 1401endif 1402 1403# Store (new) KERNELRELEASE string in include/config/kernel.release 1404include/config/kernel.release: FORCE 1405 $(call filechk,kernel.release) 1406 1407# Additional helpers built in scripts/ 1408# Carefully list dependencies so we do not try to build scripts twice 1409# in parallel 1410PHONY += scripts 1411scripts: scripts_basic scripts_dtc 1412 $(Q)$(MAKE) $(build)=$(@) 1413 1414# Things we need to do before we recursively start building the kernel 1415# or the modules are listed in "prepare". 1416# A multi level approach is used. prepareN is processed before prepareN-1. 1417# archprepare is used in arch Makefiles and when processed asm symlink, 1418# version.h and scripts_basic is processed / created. 1419 1420PHONY += prepare archprepare 1421 1422archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1423 asm-generic $(version_h) include/generated/utsrelease.h \ 1424 include/generated/compile.h include/generated/autoconf.h \ 1425 include/generated/rustc_cfg remove-stale-files 1426 1427prepare0: archprepare 1428 $(Q)$(MAKE) $(build)=scripts/mod 1429 $(Q)$(MAKE) $(build)=. prepare 1430 1431# All the preparing.. 1432prepare: prepare0 1433ifdef CONFIG_RUST 1434 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1435 $(Q)$(MAKE) $(build)=rust 1436endif 1437 1438PHONY += remove-stale-files 1439remove-stale-files: 1440 $(Q)$(srctree)/scripts/remove-stale-files 1441 1442# Support for using generic headers in asm-generic 1443asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1444 1445PHONY += asm-generic uapi-asm-generic 1446asm-generic: uapi-asm-generic 1447 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1448 generic=include/asm-generic 1449uapi-asm-generic: 1450 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1451 generic=include/uapi/asm-generic 1452 1453# Generate some files 1454# --------------------------------------------------------------------------- 1455 1456# KERNELRELEASE can change from a few different places, meaning version.h 1457# needs to be updated, so this check is forced on all builds 1458 1459uts_len := 64 1460define filechk_utsrelease.h 1461 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1462 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1463 exit 1; \ 1464 fi; \ 1465 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1466endef 1467 1468define filechk_version.h 1469 if [ $(SUBLEVEL) -gt 255 ]; then \ 1470 echo \#define LINUX_VERSION_CODE $(shell \ 1471 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1472 else \ 1473 echo \#define LINUX_VERSION_CODE $(shell \ 1474 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1475 fi; \ 1476 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1477 ((c) > 255 ? 255 : (c)))'; \ 1478 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1479 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1480 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1481endef 1482 1483$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1484$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1485$(version_h): FORCE 1486 $(call filechk,version.h) 1487 1488include/generated/utsrelease.h: include/config/kernel.release FORCE 1489 $(call filechk,utsrelease.h) 1490 1491filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1492 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1493 1494include/generated/compile.h: FORCE 1495 $(call filechk,compile.h) 1496 1497PHONY += headerdep 1498headerdep: 1499 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1500 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1501 1502# --------------------------------------------------------------------------- 1503# Kernel headers 1504 1505#Default location for installed headers 1506export INSTALL_HDR_PATH = $(objtree)/usr 1507 1508quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1509 cmd_headers_install = \ 1510 mkdir -p $(INSTALL_HDR_PATH); \ 1511 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1512 usr/include $(INSTALL_HDR_PATH) 1513 1514PHONY += headers_install 1515headers_install: headers 1516 $(call cmd,headers_install) 1517 1518PHONY += archheaders archscripts 1519 1520hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1521 1522PHONY += headers 1523headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1524ifdef HEADER_ARCH 1525 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1526else 1527 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1528 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1529endif 1530 1531ifdef CONFIG_HEADERS_INSTALL 1532prepare: headers 1533endif 1534 1535PHONY += scripts_gen_init_cpio 1536scripts_gen_init_cpio: scripts_basic 1537 $(Q)$(MAKE) $(build)=scripts scripts/gen_init_cpio 1538 1539PHONY += scripts_unifdef 1540scripts_unifdef: scripts_basic 1541 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1542 1543PHONY += scripts_gen_packed_field_checks 1544scripts_gen_packed_field_checks: scripts_basic 1545 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1546 1547# --------------------------------------------------------------------------- 1548# Header check 1549 1550# Check the headers in HEADER_CHECK=(headers|dirs) 1551PHONY += headercheck 1552 1553ifneq ($(HEADER_CHECK),) 1554 1555header-check-dirs := $(filter-out %.h,$(HEADER_CHECK)) 1556header-check-files := $(filter %.h,$(HEADER_CHECK)) $(if $(header-check-dirs),$(shell cd $(srctree) && find $(header-check-dirs) -name '*.h' 2>/dev/null)) 1557header-check-targets := $(patsubst %.h,%.header-check,$(sort $(header-check-files))) 1558 1559headercheck: 1560 $(if $(header-check-targets),,$(error $@ found no headers in HEADER_CHECK="$(HEADER_CHECK)")) 1561 $(Q)$(MAKE) $(header-check-targets) 1562else 1563headercheck: 1564 $(error $@ requires HEADER_CHECK=(headers|dirs)) 1565endif 1566 1567# --------------------------------------------------------------------------- 1568# Install 1569 1570# Many distributions have the custom install script, /sbin/installkernel. 1571# If DKMS is installed, 'make install' will eventually recurse back 1572# to this Makefile to build and install external modules. 1573# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1574 1575quiet_cmd_install = INSTALL $(INSTALL_PATH) 1576 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1577 1578# --------------------------------------------------------------------------- 1579# vDSO install 1580 1581PHONY += vdso_install 1582vdso_install: export INSTALL_FILES = $(vdso-install-y) 1583vdso_install: 1584 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1585 1586# --------------------------------------------------------------------------- 1587# Tools 1588 1589ifdef CONFIG_OBJTOOL 1590prepare: tools/objtool 1591endif 1592 1593ifdef CONFIG_BPF 1594ifdef CONFIG_DEBUG_INFO_BTF 1595prepare: tools/bpf/resolve_btfids 1596endif 1597endif 1598 1599# tools/bootconfig renders the embedded bootconfig into a cmdline at build time. 1600ifdef CONFIG_CMDLINE_FROM_BOOTCONFIG 1601prepare: tools/bootconfig 1602endif 1603 1604# tools/bootconfig is run on the build host during prepare, so force a host 1605# binary here; its own Makefile keeps $(CC) for standalone and cross builds. 1606# CROSS_COMPILE= is cleared so tools/scripts/Makefile.include does not inject 1607# the target's --target=/--sysroot= flags into the host clang invocation under 1608# LLVM=1 cross builds (which would produce a target binary that fails to exec). 1609tools/bootconfig: export CC := $(HOSTCC) 1610tools/bootconfig: FORCE 1611 $(Q)mkdir -p $(objtree)/tools 1612 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ \ 1613 bootconfig CROSS_COMPILE= 1614 1615# The tools build system is not a part of Kbuild and tends to introduce 1616# its own unique issues. If you need to integrate a new tool into Kbuild, 1617# please consider locating that tool outside the tools/ tree and using the 1618# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1619# here. See Documentation/kbuild/makefiles.rst for details. 1620 1621PHONY += resolve_btfids_clean 1622 1623resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1624 1625# tools/bpf/resolve_btfids directory might not exist 1626# in output directory, skip its clean in that case 1627resolve_btfids_clean: 1628ifneq ($(wildcard $(resolve_btfids_O)),) 1629 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1630endif 1631 1632PHONY += objtool_clean objtool_mrproper 1633 1634objtool_O = $(abspath $(objtree))/tools/objtool 1635 1636objtool_clean objtool_mrproper: 1637ifneq ($(wildcard $(objtool_O)),) 1638 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1639endif 1640 1641PHONY += bootconfig_clean 1642 1643bootconfig_O = $(abspath $(objtree))/tools/bootconfig 1644 1645bootconfig_clean: 1646ifneq ($(wildcard $(bootconfig_O)),) 1647 $(Q)$(MAKE) -sC $(srctree)/tools/bootconfig O=$(bootconfig_O) clean 1648endif 1649 1650tools/: FORCE 1651 $(Q)mkdir -p $(objtree)/tools 1652 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1653 1654tools/%: FORCE 1655 $(Q)mkdir -p $(objtree)/tools 1656 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1657 1658# --------------------------------------------------------------------------- 1659# Kernel selftest 1660 1661PHONY += kselftest 1662kselftest: headers 1663 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1664 1665kselftest-%: headers FORCE 1666 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests $* 1667 1668PHONY += kselftest-merge 1669kselftest-merge: 1670 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1671 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1672 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1673 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1674 1675# --------------------------------------------------------------------------- 1676# Devicetree files 1677 1678ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1679dtstree := arch/$(SRCARCH)/boot/dts 1680endif 1681 1682dtbindingtree := Documentation/devicetree/bindings 1683 1684%.yaml: dtbs_prepare 1685 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1686 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1687 1688ifneq ($(dtstree),) 1689 1690%.dtb: dtbs_prepare 1691 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1692 1693%.dtbo: dtbs_prepare 1694 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1695 1696PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1697dtbs: dtbs_prepare 1698 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1699 1700# include/config/kernel.release is actually needed when installing DTBs because 1701# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1702# dtbs_install depend on it as dtbs_install may run as root. 1703dtbs_prepare: include/config/kernel.release scripts_dtc 1704 1705ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1706export CHECK_DTBS=y 1707endif 1708 1709ifneq ($(CHECK_DTBS),) 1710dtbs_prepare: dt_binding_schemas 1711endif 1712 1713dtbs_check: dtbs 1714 1715dtbs_install: 1716 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1717 1718ifdef CONFIG_OF_EARLY_FLATTREE 1719all: dtbs 1720endif 1721 1722ifdef CONFIG_GENERIC_BUILTIN_DTB 1723vmlinux: dtbs 1724endif 1725 1726endif 1727 1728PHONY += scripts_dtc 1729scripts_dtc: scripts_basic 1730 $(Q)$(MAKE) $(build)=scripts/dtc 1731 1732ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1733export CHECK_DTBS=y 1734endif 1735 1736PHONY += dt_binding_check dt_binding_schemas 1737dt_binding_check: dt_binding_schemas scripts_dtc 1738 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1739 1740dt_binding_schemas: 1741 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1742 1743PHONY += dt_compatible_check 1744dt_compatible_check: dt_binding_schemas 1745 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1746 1747PHONY += dt_style_selftest 1748dt_style_selftest: 1749 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1750 1751# --------------------------------------------------------------------------- 1752# Modules 1753 1754ifdef CONFIG_MODULES 1755 1756# By default, build modules as well 1757 1758all: modules 1759 1760# When we're building modules with modversions, we need to consider 1761# the built-in objects during the descend as well, in order to 1762# make sure the checksums are up to date before we record them. 1763ifdef CONFIG_MODVERSIONS 1764 KBUILD_BUILTIN := y 1765endif 1766 1767# Build modules 1768# 1769 1770# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1771# is an exception. 1772ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1773KBUILD_BUILTIN := y 1774modules: vmlinux 1775endif 1776 1777modules: modules_prepare 1778 1779# Target to prepare building external modules 1780modules_prepare: prepare 1781 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1782 1783endif # CONFIG_MODULES 1784 1785### 1786# Cleaning is done on three levels. 1787# make clean Delete most generated files 1788# Leave enough to build external modules 1789# make mrproper Delete the current configuration, and all generated files 1790# make distclean Remove editor backup files, patch leftover files and the like 1791 1792# Directories & files removed with 'make clean' 1793CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1794 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1795 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1796 vmlinux.thinlto-index builtin.order \ 1797 compile_commands.json rust/test \ 1798 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1799 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1800 1801# Directories & files removed with 'make mrproper' 1802MRPROPER_FILES += include/config include/generated \ 1803 arch/$(SRCARCH)/include/generated .objdiff \ 1804 debian snap tar-install PKGBUILD pacman \ 1805 .config .config.old .version \ 1806 Module.symvers \ 1807 certs/signing_key.pem \ 1808 certs/x509.genkey \ 1809 vmlinux-gdb.py \ 1810 rpmbuild \ 1811 rust/libmacros.so rust/libmacros.dylib \ 1812 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1813 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1814 1815# clean - Delete most, but leave enough to build external modules 1816# 1817clean: private rm-files := $(CLEAN_FILES) 1818 1819PHONY += archclean vmlinuxclean 1820 1821vmlinuxclean: 1822 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1823 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1824 1825clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean bootconfig_clean 1826 1827# mrproper - Delete all generated files, including .config 1828# 1829mrproper: private rm-files := $(MRPROPER_FILES) 1830mrproper-dirs := $(addprefix _mrproper_,scripts) 1831 1832PHONY += $(mrproper-dirs) mrproper 1833$(mrproper-dirs): 1834 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1835 1836mrproper: clean objtool_mrproper $(mrproper-dirs) 1837 $(call cmd,rmfiles) 1838 @find . $(RCS_FIND_IGNORE) \ 1839 \( -name '*.rmeta' \) \ 1840 -type f -print | xargs rm -f 1841 1842# distclean 1843# 1844PHONY += distclean 1845 1846distclean: mrproper 1847 @find . $(RCS_FIND_IGNORE) \ 1848 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1849 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1850 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1851 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1852 -type f -print | xargs rm -f 1853 1854 1855# Packaging of the kernel to various formats 1856# --------------------------------------------------------------------------- 1857 1858modules-cpio-pkg: scripts_gen_init_cpio 1859 1860%src-pkg: FORCE 1861 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1862%pkg: include/config/kernel.release FORCE 1863 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1864 1865# Brief documentation of the typical targets used 1866# --------------------------------------------------------------------------- 1867 1868boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1869boards := $(sort $(notdir $(boards))) 1870board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1871board-dirs := $(sort $(notdir $(board-dirs:/=))) 1872 1873PHONY += help 1874help: 1875 @echo 'Cleaning targets:' 1876 @echo ' clean - Remove most generated files but keep the config and' 1877 @echo ' enough build support to build external modules' 1878 @echo ' mrproper - Remove all generated files + config + various backup files' 1879 @echo ' distclean - mrproper + remove editor backup and patch files' 1880 @echo '' 1881 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1882 @echo '' 1883 @echo 'Other generic targets:' 1884 @echo ' all - Build all targets marked with [*]' 1885 @echo '* vmlinux - Build the bare kernel' 1886 @echo '* modules - Build all modules' 1887 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1888 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1889 @echo ' dir/ - Build all files in dir and below' 1890 @echo ' dir/file.[ois] - Build specified target only' 1891 @echo ' dir/file.ll - Build the LLVM assembly file' 1892 @echo ' (requires compiler support for LLVM assembly generation)' 1893 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1894 @echo ' (requires a recent binutils and recent build (System.map))' 1895 @echo ' dir/file.ko - Build module including final link' 1896 @echo ' modules_prepare - Set up for building external modules' 1897 @echo ' tags/TAGS - Generate tags file for editors' 1898 @echo ' cscope - Generate cscope index' 1899 @echo ' gtags - Generate GNU GLOBAL index' 1900 @echo ' kernelrelease - Output the release version string (use with make -s)' 1901 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1902 @echo ' image_name - Output the image name (use with make -s)' 1903 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1904 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1905 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1906 echo '' 1907 @echo 'Static analysers:' 1908 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1909 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1910 @echo ' versioncheck - Sanity check on version.h usage' 1911 @echo ' includecheck - Check for duplicate included header files' 1912 @echo ' headerdep - Detect inclusion cycles in headers' 1913 @echo ' headercheck - Check headers in HEADER_CHECK=(headers|dirs) are' 1914 @echo ' self-contained, have header guards, and pass kernel-doc.' 1915 @echo ' coccicheck - Check with Coccinelle' 1916 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1917 @echo ' clang-analyzer - Check with clang static analyzer' 1918 @echo ' clang-tidy - Check with clang-tidy' 1919 @echo '' 1920 @echo 'Tools:' 1921 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1922 @echo ' sbom - Generate Software Bill of Materials' 1923 @echo '' 1924 @echo 'Kernel selftest:' 1925 @echo ' kselftest - Build and run kernel selftest' 1926 @echo ' Build, install, and boot kernel before' 1927 @echo ' running kselftest on it' 1928 @echo ' Run as root for full coverage' 1929 @echo ' kselftest-all - Build kernel selftest' 1930 @echo ' kselftest-install - Build and install kernel selftest' 1931 @echo ' kselftest-clean - Remove all generated kselftest files' 1932 @echo ' kselftest-merge - Merge all the config dependencies of' 1933 @echo ' kselftest to existing .config.' 1934 @echo '' 1935 @echo 'Rust targets:' 1936 @echo ' rustavailable - Checks whether the Rust toolchain is' 1937 @echo ' available and, if not, explains why.' 1938 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1939 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1940 @echo ' is formatted, printing a diff otherwise.' 1941 @echo ' rustdoc - Generate Rust documentation' 1942 @echo ' (requires kernel .config)' 1943 @echo ' rusttest - Runs the Rust tests' 1944 @echo ' (requires kernel .config; downloads external repos)' 1945 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1946 @echo ' (requires kernel .config)' 1947 @echo ' dir/file.[os] - Build specified target only' 1948 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1949 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1950 @echo ' The output is not intended to be compilable.' 1951 @echo ' dir/file.ll - Build the LLVM assembly file' 1952 @echo '' 1953 @$(if $(dtstree), \ 1954 echo 'Devicetree:'; \ 1955 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1956 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1957 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1958 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1959 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1960 echo ' dtbs_check - Validate device tree source files';\ 1961 echo '') 1962 1963 @echo 'Userspace tools targets:' 1964 @echo ' use "make tools/help"' 1965 @echo ' or "cd tools; make help"' 1966 @echo '' 1967 @echo 'Kernel packaging:' 1968 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1969 @echo '' 1970 @echo 'Documentation targets:' 1971 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1972 @echo '' 1973 @echo 'Architecture-specific targets ($(SRCARCH)):' 1974 @$(or $(archhelp),\ 1975 echo ' No architecture-specific help defined for $(SRCARCH)') 1976 @echo '' 1977 @$(if $(boards), \ 1978 $(foreach b, $(boards), \ 1979 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1980 echo '') 1981 @$(if $(board-dirs), \ 1982 $(foreach b, $(board-dirs), \ 1983 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1984 printf " %-16s - Show all of the above\\n" help-boards; \ 1985 echo '') 1986 1987 @echo ' make V=n [targets] 1: verbose build' 1988 @echo ' 2: give reason for rebuild of target' 1989 @echo ' V=1 and V=2 can be combined with V=12' 1990 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1991 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1992 @echo ' (sparse by default)' 1993 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1994 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1995 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1996 @echo ' 1: warnings which may be relevant and do not occur too often' 1997 @echo ' 2: warnings which occur quite often but may still be relevant' 1998 @echo ' 3: more obscure warnings, can most likely be ignored' 1999 @echo ' c: extra checks in the configuration stage (Kconfig)' 2000 @echo ' e: warnings are being treated as errors' 2001 @echo ' Multiple levels can be combined with W=12 or W=123' 2002 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 2003 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 2004 @$(if $(dtstree), \ 2005 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 2006 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 2007 ) 2008 @echo '' 2009 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 2010 @echo 'For further info see the ./README file' 2011 2012 2013help-board-dirs := $(addprefix help-,$(board-dirs)) 2014 2015help-boards: $(help-board-dirs) 2016 2017boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 2018 2019$(help-board-dirs): help-%: 2020 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 2021 @$(if $(boards-per-dir), \ 2022 $(foreach b, $(boards-per-dir), \ 2023 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 2024 echo '') 2025 2026 2027# Documentation targets 2028# --------------------------------------------------------------------------- 2029DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 2030 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 2031 htmldocs-redirects 2032 2033PHONY += $(DOC_TARGETS) 2034$(DOC_TARGETS): 2035 $(Q)$(MAKE) $(build)=Documentation $@ 2036 2037 2038# Rust targets 2039# --------------------------------------------------------------------------- 2040 2041# "Is Rust available?" target 2042PHONY += rustavailable 2043rustavailable: 2044 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 2045 2046# Documentation target 2047# 2048# Using the singular to avoid running afoul of `no-dot-config-targets`. 2049PHONY += rustdoc 2050rustdoc: prepare 2051 $(Q)$(MAKE) $(build)=rust $@ 2052 2053# Testing target 2054PHONY += rusttest 2055rusttest: prepare 2056 $(Q)$(MAKE) $(build)=rust $@ 2057 2058# Formatting targets 2059# 2060# Generated files as well as vendored crates are skipped. 2061PHONY += rustfmt rustfmtcheck 2062 2063rustfmt: 2064 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 2065 \( \ 2066 -path $(srctree)/rust/proc-macro2 \ 2067 -o -path $(srctree)/rust/quote \ 2068 -o -path $(srctree)/rust/syn \ 2069 -o -path $(srctree)/rust/zerocopy \ 2070 -o -path $(srctree)/rust/zerocopy-derive \ 2071 \) -prune -o \ 2072 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2073 | xargs $(RUSTFMT) $(rustfmt_flags) 2074 2075rustfmtcheck: rustfmt_flags = --check 2076rustfmtcheck: rustfmt 2077 2078# Misc 2079# --------------------------------------------------------------------------- 2080 2081PHONY += misc-check 2082misc-check: 2083 $(Q)$(srctree)/scripts/misc-check 2084 2085all: misc-check 2086 2087PHONY += scripts_gdb 2088scripts_gdb: prepare0 2089 $(Q)$(MAKE) $(build)=scripts/gdb 2090 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2091 2092ifdef CONFIG_GDB_SCRIPTS 2093all: scripts_gdb 2094endif 2095 2096else # KBUILD_EXTMOD 2097 2098filechk_kernel.release = echo $(KERNELRELEASE) 2099 2100### 2101# External module support. 2102# When building external modules the kernel used as basis is considered 2103# read-only, and no consistency checks are made and the make 2104# system is not used on the basis kernel. If updates are required 2105# in the basis kernel ordinary make commands (without M=...) must be used. 2106 2107# We are always building only modules. 2108KBUILD_BUILTIN := 2109KBUILD_MODULES := y 2110 2111build-dir := . 2112 2113clean-dirs := . 2114clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2115 2116PHONY += prepare 2117# now expand this into a simple variable to reduce the cost of shell evaluations 2118prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2119prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2120prepare: 2121 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2122 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2123 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2124 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2125 fi 2126 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2127 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2128 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2129 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2130 fi 2131 2132PHONY += help 2133help: 2134 @echo ' Building external modules.' 2135 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2136 @echo '' 2137 @echo ' modules - default target, build the module(s)' 2138 @echo ' modules_install - install the module' 2139 @echo ' clean - remove generated files in module directory only' 2140 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2141 @echo '' 2142 2143ifndef CONFIG_MODULES 2144modules modules_install: __external_modules_error 2145__external_modules_error: 2146 @echo >&2 '***' 2147 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2148 @echo >&2 '*** You cannot build or install external modules.' 2149 @echo >&2 '***' 2150 @false 2151endif 2152 2153endif # KBUILD_EXTMOD 2154 2155# --------------------------------------------------------------------------- 2156# Modules 2157 2158PHONY += modules modules_install modules_sign modules_prepare 2159 2160modules_install: 2161 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2162 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2163 2164ifeq ($(CONFIG_MODULE_SIG),y) 2165# modules_sign is a subset of modules_install. 2166# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2167modules_sign: modules_install 2168 @: 2169else 2170modules_sign: 2171 @echo >&2 '***' 2172 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2173 @echo >&2 '***' 2174 @false 2175endif 2176 2177ifdef CONFIG_MODULES 2178 2179modules.order: $(build-dir) 2180 @: 2181 2182# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2183# This is solely useful to speed up test compiles. 2184modules: modpost 2185ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2186 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2187endif 2188 2189PHONY += modules_check 2190modules_check: modules.order 2191 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2192 2193else # CONFIG_MODULES 2194 2195modules: 2196 @: 2197 2198KBUILD_MODULES := 2199 2200endif # CONFIG_MODULES 2201 2202PHONY += modpost 2203modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2204 $(if $(KBUILD_MODULES), modules_check) 2205 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2206 2207# Single targets 2208# --------------------------------------------------------------------------- 2209# To build individual files in subdirectories, you can do like this: 2210# 2211# make foo/bar/baz.s 2212# 2213# The supported suffixes for single-target are listed in 'single-targets' 2214# 2215# To build only under specific subdirectories, you can do like this: 2216# 2217# make foo/bar/baz/ 2218 2219ifdef single-build 2220 2221# .ko is special because modpost is needed 2222single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2223single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2224 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2225 2226$(single-ko): single_modules 2227 @: 2228$(single-no-ko): $(build-dir) 2229 @: 2230 2231# Remove modules.order when done because it is not the real one. 2232PHONY += single_modules 2233single_modules: $(single-no-ko) modules_prepare 2234 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2235 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2236ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2237 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2238endif 2239 $(Q)rm -f modules.order 2240 2241single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2242 2243KBUILD_MODULES := y 2244 2245endif 2246 2247prepare: outputmakefile 2248 2249# Preset locale variables to speed up the build process. Limit locale 2250# tweaks to this spot to avoid wrong language settings when running 2251# make menuconfig etc. 2252# Error messages still appears in the original language 2253PHONY += $(build-dir) 2254$(build-dir): prepare 2255 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2256 2257clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2258PHONY += $(clean-dirs) clean 2259$(clean-dirs): 2260 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2261 2262clean: $(clean-dirs) 2263 $(call cmd,rmfiles) 2264 @find . $(RCS_FIND_IGNORE) \ 2265 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2266 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2267 -o -name '*.dtb' -o -name '*.dtbo' \ 2268 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2269 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2270 -o -name '*.dwo' -o -name '*.lst' \ 2271 -o -name '*.su' -o -name '*.mod' \ 2272 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2273 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2274 -o -name '*.asn1.[ch]' \ 2275 -o -name '*.symtypes' -o -name 'modules.order' \ 2276 -o -name '*.c.[012]*.*' \ 2277 -o -name '*.ll' \ 2278 -o -name '*.gcno' \ 2279 -o -name '*.long-type-*.txt' \ 2280 -o -name '*.header-check' \ 2281 \) -type f -print \ 2282 -o -name '.tmp_*' -print \ 2283 | xargs rm -rf 2284 2285# Generate tags for editors 2286# --------------------------------------------------------------------------- 2287quiet_cmd_tags = GEN $@ 2288 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2289 2290tags TAGS cscope gtags: FORCE 2291 $(call cmd,tags) 2292 2293# Generate rust-project.json (a file that describes the structure of non-Cargo 2294# Rust projects) for rust-analyzer (an implementation of the Language Server 2295# Protocol). 2296PHONY += rust-analyzer 2297rust-analyzer: 2298 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2299ifdef KBUILD_EXTMOD 2300# FIXME: external modules must not descend into a sub-directory of the kernel 2301 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2302else 2303 $(Q)$(MAKE) $(build)=rust $@ 2304endif 2305 2306# Script to generate missing namespace dependencies 2307# --------------------------------------------------------------------------- 2308 2309PHONY += nsdeps 2310nsdeps: export KBUILD_NSDEPS=1 2311nsdeps: modules 2312 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2313 2314# Script to generate .spdx.json SBOM documents describing the build 2315# --------------------------------------------------------------------------- 2316 2317ifdef building_out_of_srctree 2318sbom_targets := sbom-source.spdx.json 2319endif 2320sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2321quiet_cmd_sbom = GEN $(sbom_targets) 2322 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2323 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2324 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2325 --src-tree $(abspath $(srctree)) \ 2326 --obj-tree $(abspath $(objtree)) \ 2327 --roots-file "$(tmp-target)" \ 2328 --output-directory $(abspath $(objtree)) \ 2329 --generate-spdx \ 2330 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2331 --package-version "$(KERNELVERSION)" \ 2332 --write-output-on-error; 2333PHONY += sbom 2334sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2335 $(call cmd,sbom) 2336 2337# Clang Tooling 2338# --------------------------------------------------------------------------- 2339 2340quiet_cmd_gen_compile_commands = GEN $@ 2341 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2342 2343compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2344 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2345 $(if $(CONFIG_MODULES), modules.order) FORCE 2346 $(call if_changed,gen_compile_commands) 2347 2348targets += compile_commands.json 2349 2350PHONY += clang-tidy clang-analyzer 2351 2352ifdef CONFIG_CC_IS_CLANG 2353quiet_cmd_clang_tools = CHECK $< 2354 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2355 2356clang-tidy clang-analyzer: compile_commands.json 2357 $(call cmd,clang_tools) 2358else 2359clang-tidy clang-analyzer: 2360 @echo "$@ requires CC=clang" >&2 2361 @false 2362endif 2363 2364# Scripts to check various things for consistency 2365# --------------------------------------------------------------------------- 2366 2367PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2368 2369includecheck: 2370 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2371 -name '*.[hcS]' -type f -print | sort \ 2372 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2373 2374versioncheck: 2375 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2376 -name '*.[hcS]' -type f -print | sort \ 2377 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2378 2379coccicheck: 2380 $(Q)$(BASH) $(srctree)/scripts/$@ 2381 2382kconfig-sym-check: 2383 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2384 2385PHONY += checkstack kernelrelease kernelversion image_name 2386 2387# UML needs a little special treatment here. It wants to use the host 2388# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2389# else wants $(ARCH), including people doing cross-builds, which means 2390# that $(SUBARCH) doesn't work here. 2391ifeq ($(ARCH), um) 2392CHECKSTACK_ARCH := $(SUBARCH) 2393else 2394CHECKSTACK_ARCH := $(ARCH) 2395endif 2396MINSTACKSIZE ?= 100 2397checkstack: 2398 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2399 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2400 2401kernelrelease: 2402 @$(filechk_kernel.release) 2403 2404kernelversion: 2405 @echo $(KERNELVERSION) 2406 2407image_name: 2408 @echo $(KBUILD_IMAGE) 2409 2410PHONY += run-command 2411run-command: 2412 $(Q)$(KBUILD_RUN_COMMAND) 2413 2414quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2415 cmd_rmfiles = rm -rf $(rm-files) 2416 2417# read saved command lines for existing targets 2418existing-targets := $(wildcard $(sort $(targets))) 2419 2420-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2421 2422endif # config-build 2423endif # mixed-build 2424endif # need-sub-make 2425 2426PHONY += FORCE 2427FORCE: 2428 2429# Declare the contents of the PHONY variable as phony. We keep that 2430# information in a variable so we can use it in if_changed and friends. 2431.PHONY: $(PHONY) 2432