1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 2 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 kconfig-sym-check \ 297 $(version_h) headers headers_% archheaders archscripts \ 298 %asm-generic kernelversion %src-pkg dt_binding_check \ 299 dt_style_selftest \ 300 outputmakefile rustavailable rustfmt rustfmtcheck \ 301 run-command 302no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 303 image_name 304single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 305 306config-build := 307mixed-build := 308need-config := 1 309may-sync-config := 1 310single-build := 311 312ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 313 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 314 need-config := 315 endif 316endif 317 318ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 319 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 320 may-sync-config := 321 endif 322endif 323 324need-compiler := $(may-sync-config) 325 326ifneq ($(KBUILD_EXTMOD),) 327 may-sync-config := 328endif 329 330ifeq ($(KBUILD_EXTMOD),) 331 ifneq ($(filter %config,$(MAKECMDGOALS)),) 332 config-build := 1 333 ifneq ($(words $(MAKECMDGOALS)),1) 334 mixed-build := 1 335 endif 336 endif 337endif 338 339# We cannot build single targets and the others at the same time 340ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 341 single-build := 1 342 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 343 mixed-build := 1 344 endif 345endif 346 347# For "make -j clean all", "make -j mrproper defconfig all", etc. 348ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 349 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 350 mixed-build := 1 351 endif 352endif 353 354# install and modules_install need also be processed one by one 355ifneq ($(filter install,$(MAKECMDGOALS)),) 356 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 357 mixed-build := 1 358 endif 359endif 360 361ifdef mixed-build 362# =========================================================================== 363# We're called with mixed targets (*config and build targets). 364# Handle them one by one. 365 366PHONY += $(MAKECMDGOALS) __build_one_by_one 367 368$(MAKECMDGOALS): __build_one_by_one 369 @: 370 371__build_one_by_one: 372 $(Q)set -e; \ 373 for i in $(MAKECMDGOALS); do \ 374 $(MAKE) -f $(srctree)/Makefile $$i; \ 375 done 376 377else # !mixed-build 378 379include $(srctree)/scripts/Kbuild.include 380 381# Read KERNELRELEASE from include/config/kernel.release (if it exists) 382KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 383KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 384export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 385 386include $(srctree)/scripts/subarch.include 387 388# Cross compiling and selecting different set of gcc/bin-utils 389# --------------------------------------------------------------------------- 390# 391# When performing cross compilation for other architectures ARCH shall be set 392# to the target architecture. (See arch/* for the possibilities). 393# ARCH can be set during invocation of make: 394# make ARCH=arm64 395# Another way is to have ARCH set in the environment. 396# The default ARCH is the host where make is executed. 397 398# CROSS_COMPILE specify the prefix used for all executables used 399# during compilation. Only gcc and related bin-utils executables 400# are prefixed with $(CROSS_COMPILE). 401# CROSS_COMPILE can be set on the command line 402# make CROSS_COMPILE=aarch64-linux-gnu- 403# Alternatively CROSS_COMPILE can be set in the environment. 404# Default value for CROSS_COMPILE is not to prefix executables 405# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 406ARCH ?= $(SUBARCH) 407 408# Architecture as present in compile.h 409UTS_MACHINE := $(ARCH) 410SRCARCH := $(ARCH) 411 412# Additional ARCH settings for x86 413ifeq ($(ARCH),i386) 414 SRCARCH := x86 415endif 416ifeq ($(ARCH),x86_64) 417 SRCARCH := x86 418endif 419 420# Additional ARCH settings for sparc 421ifeq ($(ARCH),sparc32) 422 SRCARCH := sparc 423endif 424ifeq ($(ARCH),sparc64) 425 SRCARCH := sparc 426endif 427 428# Additional ARCH settings for parisc 429ifeq ($(ARCH),parisc64) 430 SRCARCH := parisc 431endif 432 433export cross_compiling := 434ifneq ($(SRCARCH),$(SUBARCH)) 435cross_compiling := 1 436endif 437 438KCONFIG_CONFIG ?= .config 439export KCONFIG_CONFIG 440 441# SHELL used by kbuild 442CONFIG_SHELL := sh 443 444HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 445HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 446HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 447 448ifneq ($(LLVM),) 449ifneq ($(filter %/,$(LLVM)),) 450LLVM_PREFIX := $(LLVM) 451else ifneq ($(filter -%,$(LLVM)),) 452LLVM_SUFFIX := $(LLVM) 453else ifneq ($(LLVM),1) 454$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 455endif 456 457HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 458HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 459else 460HOSTCC = gcc 461HOSTCXX = g++ 462endif 463HOSTRUSTC = rustc 464HOSTPKG_CONFIG = pkg-config 465 466# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 467# has a logic to call it 468KERNELDOC = $(srctree)/tools/docs/kernel-doc 469export KERNELDOC 470 471KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 472 -O2 -fomit-frame-pointer -std=gnu11 473KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 474KBUILD_USERLDFLAGS := $(USERLDFLAGS) 475 476# These flags apply to all Rust code in the tree, including the kernel and 477# host programs. 478export rust_common_flags := --edition=2021 \ 479 -Zbinary_dep_depinfo=y \ 480 -Astable_features \ 481 -Aunused_features \ 482 -Dnon_ascii_idents \ 483 -Dunsafe_op_in_unsafe_fn \ 484 -Wmissing_docs \ 485 -Wrust_2018_idioms \ 486 -Wunreachable_pub \ 487 -Wclippy::all \ 488 -Wclippy::as_ptr_cast_mut \ 489 -Wclippy::as_underscore \ 490 -Wclippy::cast_lossless \ 491 -Aclippy::collapsible_if \ 492 -Aclippy::collapsible_match \ 493 -Wclippy::ignored_unit_patterns \ 494 -Aclippy::incompatible_msrv \ 495 -Wclippy::mut_mut \ 496 -Wclippy::needless_bitwise_bool \ 497 -Aclippy::needless_lifetimes \ 498 -Wclippy::no_mangle_with_rust_abi \ 499 -Wclippy::ptr_as_ptr \ 500 -Wclippy::ptr_cast_constness \ 501 -Wclippy::ref_as_ptr \ 502 -Wclippy::undocumented_unsafe_blocks \ 503 -Aclippy::uninlined_format_args \ 504 -Wclippy::unnecessary_safety_comment \ 505 -Wclippy::unnecessary_safety_doc \ 506 -Wrustdoc::missing_crate_level_docs \ 507 -Wrustdoc::unescaped_backticks 508 509KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 510 $(HOSTCFLAGS) -I $(srctree)/scripts/include 511KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 512 -I $(srctree)/scripts/include 513KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 514 -Zallow-features= 515KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 516KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 517KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 518 519# Make variables (CC, etc...) 520CPP = $(CC) -E 521ifneq ($(LLVM),) 522CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 523LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 524AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 525LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 526NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 527OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 528OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 529READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 530STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 531ifeq ($(filter -fuse-ld=% --ld-path=%,$(KBUILD_HOSTLDFLAGS)),) 532KBUILD_HOSTLDFLAGS += -fuse-ld=lld 533endif 534else 535CC = $(CROSS_COMPILE)gcc 536LD = $(CROSS_COMPILE)ld 537AR = $(CROSS_COMPILE)ar 538NM = $(CROSS_COMPILE)nm 539OBJCOPY = $(CROSS_COMPILE)objcopy 540OBJDUMP = $(CROSS_COMPILE)objdump 541READELF = $(CROSS_COMPILE)readelf 542STRIP = $(CROSS_COMPILE)strip 543endif 544RUSTC = rustc 545RUSTDOC = rustdoc 546RUSTFMT = rustfmt 547CLIPPY_DRIVER = clippy-driver 548BINDGEN = bindgen 549PAHOLE = pahole 550RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 551LEX = flex 552YACC = bison 553AWK = awk 554INSTALLKERNEL := installkernel 555PERL = perl 556PYTHON3 = python3 557CHECK = sparse 558BASH = bash 559KGZIP = gzip 560KBZIP2 = bzip2 561KLZOP = lzop 562LZMA = lzma 563LZ4 = lz4 564XZ = xz 565ZSTD = zstd 566TAR = tar 567 568CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 569 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 570NOSTDINC_FLAGS := 571CFLAGS_MODULE = 572RUSTFLAGS_MODULE = 573AFLAGS_MODULE = 574LDFLAGS_MODULE = 575CFLAGS_KERNEL = 576RUSTFLAGS_KERNEL = 577AFLAGS_KERNEL = 578LDFLAGS_vmlinux = 579 580# Use USERINCLUDE when you must reference the UAPI directories only. 581USERINCLUDE := \ 582 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 583 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 584 -I$(srctree)/include/uapi \ 585 -I$(objtree)/include/generated/uapi \ 586 -include $(srctree)/include/linux/compiler-version.h \ 587 -include $(srctree)/include/linux/kconfig.h 588 589# Use LINUXINCLUDE when you must reference the include/ directory. 590# Needed to be compatible with the O= option 591LINUXINCLUDE := \ 592 -I$(srctree)/arch/$(SRCARCH)/include \ 593 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 594 -I$(srctree)/include \ 595 -I$(objtree)/include \ 596 $(USERINCLUDE) 597 598KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 599 600KBUILD_CFLAGS := 601KBUILD_CFLAGS += -fshort-wchar 602KBUILD_CFLAGS += -funsigned-char 603KBUILD_CFLAGS += -fno-common 604KBUILD_CFLAGS += -fno-PIE 605KBUILD_CFLAGS += -fno-strict-aliasing 606 607KBUILD_CPPFLAGS := -D__KERNEL__ 608KBUILD_RUSTFLAGS := $(rust_common_flags) \ 609 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 610 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 611 -Csymbol-mangling-version=v0 \ 612 -Crelocation-model=static \ 613 -Zfunction-sections=n \ 614 -Wclippy::float_arithmetic 615KBUILD_RUSTFLAGS_OPTION_CHKS := 616 617KBUILD_AFLAGS_KERNEL := 618KBUILD_CFLAGS_KERNEL := 619KBUILD_RUSTFLAGS_KERNEL := 620KBUILD_AFLAGS_MODULE := -DMODULE 621KBUILD_CFLAGS_MODULE := -DMODULE 622KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 623KBUILD_LDFLAGS_MODULE := 624KBUILD_LDFLAGS := 625CLANG_FLAGS := 626 627ifeq ($(KBUILD_CLIPPY),1) 628 RUSTC_OR_CLIPPY_QUIET := CLIPPY 629 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 630else 631 RUSTC_OR_CLIPPY_QUIET := RUSTC 632 RUSTC_OR_CLIPPY = $(RUSTC) 633endif 634 635# Allows the usage of unstable features in stable compilers. 636export RUSTC_BOOTSTRAP := 1 637 638# Allows finding `.clippy.toml` in out-of-srctree builds. 639export CLIPPY_CONF_DIR := $(srctree) 640 641export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 642export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 643export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 644export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 645export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 646export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 647export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 648export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 649 650export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 651export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 652export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 653export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 654export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 655export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 656 657# Files to ignore in find ... statements 658 659export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 660 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 661 -prune -o 662 663# =========================================================================== 664# Rules shared between *config targets and build targets 665 666# Basic helpers built in scripts/basic/ 667PHONY += scripts_basic 668scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 669scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 670scripts_basic: 671 $(Q)$(MAKE) $(build)=scripts/basic 672 673PHONY += outputmakefile 674ifdef building_out_of_srctree 675# Before starting out-of-tree build, make sure the source tree is clean. 676# outputmakefile generates a Makefile in the output directory, if using a 677# separate output directory. This allows convenient use of make in the 678# output directory. 679# At the same time when output Makefile generated, generate .gitignore to 680# ignore whole output directory 681 682ifdef KBUILD_EXTMOD 683print_env_for_makefile = \ 684 echo "export KBUILD_OUTPUT = $(objtree)"; \ 685 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 686 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 687else 688print_env_for_makefile = \ 689 echo "export KBUILD_OUTPUT = $(CURDIR)" 690endif 691 692filechk_makefile = { \ 693 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 694 $(print_env_for_makefile); \ 695 echo "include $(abs_srctree)/Makefile"; \ 696 } 697 698$(objtree)/Makefile: FORCE 699 $(call filechk,makefile) 700 701# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 702PHONY += $(objtree)/Makefile 703 704outputmakefile: $(objtree)/Makefile 705ifeq ($(KBUILD_EXTMOD),) 706 @if [ -f $(srctree)/.config -o \ 707 -d $(srctree)/include/config -o \ 708 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 709 echo >&2 "***"; \ 710 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 711 echo >&2 "*** in $(abs_srctree)";\ 712 echo >&2 "***"; \ 713 false; \ 714 fi 715else 716 @if [ -f $(srcroot)/modules.order ]; then \ 717 echo >&2 "***"; \ 718 echo >&2 "*** The external module source tree is not clean."; \ 719 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 720 echo >&2 "***"; \ 721 false; \ 722 fi 723endif 724 $(Q)ln -fsn $(srcroot) source 725 $(Q)test -e .gitignore || \ 726 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 727endif 728 729# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 730# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 731# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 732# Kconfig (so they need export), and from include/config/auto.conf.cmd to 733# detect the version changes between builds. 734CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 735RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 736PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 737 738ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 739include $(srctree)/scripts/Makefile.clang 740endif 741 742# Include this also for config targets because some architectures need 743# cc-cross-prefix to determine CROSS_COMPILE. 744ifdef need-compiler 745include $(srctree)/scripts/Makefile.compiler 746endif 747 748ifdef config-build 749# =========================================================================== 750# *config targets only - make sure prerequisites are updated, and descend 751# in scripts/kconfig to make the *config target 752 753# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 754# KBUILD_DEFCONFIG may point out an alternative default configuration 755# used for 'make defconfig' 756include $(srctree)/arch/$(SRCARCH)/Makefile 757export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 758 759config: outputmakefile scripts_basic FORCE 760 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 761 762%config: outputmakefile scripts_basic FORCE 763 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 764 765else #!config-build 766# =========================================================================== 767# Build targets only - this includes vmlinux, arch-specific targets, clean 768# targets and others. In general all targets except *config targets. 769 770# If building an external module we do not care about the all: rule 771# but instead __all depend on modules 772PHONY += all 773ifeq ($(KBUILD_EXTMOD),) 774__all: all 775else 776__all: modules 777endif 778 779targets := 780 781# Decide whether to build built-in, modular, or both. 782# Normally, just do built-in. 783 784KBUILD_MODULES := 785KBUILD_BUILTIN := y 786 787# If we have only "make modules", don't compile built-in objects. 788ifeq ($(MAKECMDGOALS),modules) 789 KBUILD_BUILTIN := 790endif 791 792# If we have "make <whatever> modules", compile modules 793# in addition to whatever we do anyway. 794# Just "make" or "make all" shall build modules as well 795 796ifneq ($(filter all modules nsdeps compile_commands.json clang-% sbom,$(MAKECMDGOALS)),) 797 KBUILD_MODULES := y 798endif 799 800ifeq ($(MAKECMDGOALS),) 801 KBUILD_MODULES := y 802endif 803 804export KBUILD_MODULES KBUILD_BUILTIN 805 806ifdef need-config 807include $(objtree)/include/config/auto.conf 808endif 809 810CC_FLAGS_DIALECT := -std=gnu11 811# Allow including a tagged struct or union anonymously in another struct/union. 812CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 813# Clang enables warnings about GNU and Microsoft extensions by default, disable 814# them because this is expected with the above options. 815ifdef CONFIG_CC_IS_CLANG 816CC_FLAGS_DIALECT += -Wno-gnu 817CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 818endif 819export CC_FLAGS_DIALECT 820KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 821 822ifeq ($(KBUILD_EXTMOD),) 823# Objects we will link into vmlinux / subdirs we need to visit 824core-y := 825drivers-y := 826libs-y := lib/ 827endif # KBUILD_EXTMOD 828 829# The all: target is the default when no target is given on the 830# command line. 831# This allow a user to issue only 'make' to build a kernel including modules 832# Defaults to vmlinux, but the arch makefile usually adds further targets 833all: vmlinux 834 835# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 836ifdef CONFIG_FUNCTION_TRACER 837 CC_FLAGS_FTRACE := -pg 838endif 839 840ifdef CONFIG_TRACEPOINTS 841# To check for unused tracepoints (tracepoints that are defined but never 842# called), run with: 843# 844# make UT=1 845# 846# Each unused tracepoints can take up to 5KB of memory in the running kernel. 847# It is best to remove any that are not used. 848# 849# This command line option will be removed when all current unused 850# tracepoints are removed. 851 852ifeq ("$(origin UT)", "command line") 853 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 854endif 855endif # CONFIG_TRACEPOINTS 856 857export WARN_ON_UNUSED_TRACEPOINTS 858 859# Per-version Rust flags. These are like `rust_common_flags`, but may 860# depend on the Rust compiler version (e.g. using `rustc-min-version`). 861# 862# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 863# include bitmasking and shift operations. However, because it generated 864# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 865# lint which is not enabled by default. 866rust_common_flags_per_version := \ 867 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 868 869rust_common_flags += $(rust_common_flags_per_version) 870KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 871KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 872 873include $(srctree)/arch/$(SRCARCH)/Makefile 874 875ifdef need-config 876ifdef may-sync-config 877# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 878# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 879# because some architectures define CROSS_COMPILE there. 880include include/config/auto.conf.cmd 881 882$(KCONFIG_CONFIG): 883 @echo >&2 '***' 884 @echo >&2 '*** Configuration file "$@" not found!' 885 @echo >&2 '***' 886 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 887 @echo >&2 '*** "make menuconfig" or "make xconfig").' 888 @echo >&2 '***' 889 @/bin/false 890 891# The actual configuration files used during the build are stored in 892# include/generated/ and include/config/. Update them if .config is newer than 893# include/config/auto.conf (which mirrors .config). 894# 895# This exploits the 'multi-target pattern rule' trick. 896# The syncconfig should be executed only once to make all the targets. 897# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 898# 899# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 900# so you cannot notice that Kconfig is waiting for the user input. 901%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 902 $(Q)$(kecho) " SYNC $@" 903 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 904else # !may-sync-config 905# External modules and some install targets need include/generated/autoconf.h 906# and include/config/auto.conf but do not care if they are up-to-date. 907# Use auto.conf to show the error message 908 909checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 910missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 911 912ifdef missing-configs 913PHONY += $(objtree)/include/config/auto.conf 914 915$(objtree)/include/config/auto.conf: 916 @echo >&2 '***' 917 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 918 @printf >&2 '*** - %s\n' $(missing-configs) 919 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 920 @echo >&2 '***' 921 @/bin/false 922endif 923 924endif # may-sync-config 925endif # need-config 926 927KBUILD_CFLAGS += -fno-delete-null-pointer-checks 928 929ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 930KBUILD_CFLAGS += -O2 931KBUILD_RUSTFLAGS += -Copt-level=2 932else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 933KBUILD_CFLAGS += -Os 934KBUILD_RUSTFLAGS += -Copt-level=s 935endif 936 937# Always set `debug-assertions` and `overflow-checks` because their default 938# depends on `opt-level` and `debug-assertions`, respectively. 939KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 940KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 941 942# Tell gcc to never replace conditional load with a non-conditional one 943ifdef CONFIG_CC_IS_GCC 944# gcc-10 renamed --param=allow-store-data-races=0 to 945# -fno-allow-store-data-races. 946KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 947KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 948endif 949 950ifdef CONFIG_READABLE_ASM 951# Disable optimizations that make assembler listings hard to read. 952# reorder blocks reorders the control in the function 953# ipa clone creates specialized cloned functions 954# partial inlining inlines only parts of functions 955KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 956endif 957 958stackp-flags-y := -fno-stack-protector 959stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 960stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 961 962KBUILD_CFLAGS += $(stackp-flags-y) 963 964ifdef CONFIG_FRAME_POINTER 965KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 966KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 967# Work around rustc bug on compilers without 968# https://github.com/rust-lang/rust/pull/156980. 969KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=frame-pointer:u32:2:max) 970else 971# Some targets (ARM with Thumb2, for example), can't be built with frame 972# pointers. For those, we don't have FUNCTION_TRACER automatically 973# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 974# incompatible with -fomit-frame-pointer with current GCC, so we don't use 975# -fomit-frame-pointer with FUNCTION_TRACER. 976# In the Rust target specification, "frame-pointer" is set explicitly 977# to "may-omit". 978ifndef CONFIG_FUNCTION_TRACER 979KBUILD_CFLAGS += -fomit-frame-pointer 980endif 981endif 982 983# Initialize all stack variables with a 0xAA pattern. 984ifdef CONFIG_INIT_STACK_ALL_PATTERN 985KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 986endif 987 988# Initialize all stack variables with a zero value. 989ifdef CONFIG_INIT_STACK_ALL_ZERO 990KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 991ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 992# https://github.com/llvm/llvm-project/issues/44842 993CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 994export CC_AUTO_VAR_INIT_ZERO_ENABLER 995KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 996endif 997endif 998 999ifdef CONFIG_KMALLOC_PARTITION_TYPED 1000# KMALLOC_PARTITION_CACHES_NR + 1 1001KBUILD_CFLAGS += -falloc-token-max=16 1002endif 1003 1004ifdef CONFIG_CC_IS_CLANG 1005ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1006KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1007endif 1008endif 1009 1010# Explicitly clear padding bits during variable initialization 1011KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1012 1013# While VLAs have been removed, GCC produces unreachable stack probes 1014# for the randomize_kstack_offset feature. Disable it for all compilers. 1015KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1016 1017# Get details on warnings generated due to GCC value tracking. 1018KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1019 1020# Show inlining notes for __attribute__((warning/error)) call chains. 1021# GCC supports this unconditionally while Clang 23+ provides a flag. 1022KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1023 1024# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1025ifdef CONFIG_ZERO_CALL_USED_REGS 1026KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1027endif 1028 1029ifdef CONFIG_FUNCTION_TRACER 1030ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1031 CC_FLAGS_FTRACE += -mrecord-mcount 1032 ifdef CONFIG_HAVE_NOP_MCOUNT 1033 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1034 CC_FLAGS_FTRACE += -mnop-mcount 1035 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1036 endif 1037 endif 1038endif 1039ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1040 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1041 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1042 endif 1043endif 1044ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1045 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1046 BUILD_C_RECORDMCOUNT := y 1047 export BUILD_C_RECORDMCOUNT 1048 endif 1049endif 1050ifdef CONFIG_HAVE_FENTRY 1051 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1052 ifeq ($(call cc-option-yn, -mfentry),y) 1053 CC_FLAGS_FTRACE += -mfentry 1054 CC_FLAGS_USING += -DCC_USING_FENTRY 1055 endif 1056endif 1057export CC_FLAGS_FTRACE 1058KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1059KBUILD_AFLAGS += $(CC_FLAGS_USING) 1060endif 1061 1062# We trigger additional mismatches with less inlining 1063ifdef CONFIG_DEBUG_SECTION_MISMATCH 1064KBUILD_CFLAGS += -fno-inline-functions-called-once 1065endif 1066 1067# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1068ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1069KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1070KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1071LDFLAGS_vmlinux += --gc-sections 1072endif 1073 1074ifdef CONFIG_SHADOW_CALL_STACK 1075ifndef CONFIG_DYNAMIC_SCS 1076CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1077KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1078KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1079endif 1080export CC_FLAGS_SCS 1081endif 1082 1083ifdef CONFIG_LTO_CLANG 1084ifdef CONFIG_LTO_CLANG_FULL 1085CC_FLAGS_LTO := -flto 1086else 1087CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1088 1089# These LLVM options were initially added with only in-process ThinLTO 1090# support, so avoid distributed ThinLTO support for now. 1091ifdef CONFIG_LTO_CLANG_THIN 1092KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1093endif 1094endif 1095CC_FLAGS_LTO += -fvisibility=hidden 1096 1097# Limit inlining across translation units to reduce binary size 1098KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1099endif 1100 1101ifdef CONFIG_LTO 1102KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1103KBUILD_AFLAGS += -fno-lto 1104export CC_FLAGS_LTO 1105endif 1106 1107ifdef CONFIG_CFI 1108CC_FLAGS_CFI := -fsanitize=kcfi 1109ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1110 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1111endif 1112ifdef CONFIG_FINEIBT_BHI 1113 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1114endif 1115ifdef CONFIG_RUST 1116 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1117 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1118 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1119 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1120 export RUSTC_FLAGS_CFI 1121endif 1122KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1123export CC_FLAGS_CFI 1124endif 1125 1126# Architectures can define flags to add/remove for floating-point support 1127CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1128export CC_FLAGS_FPU 1129export CC_FLAGS_NO_FPU 1130 1131ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1132# Set the minimal function alignment. Use the newer GCC option 1133# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1134# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1135ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1136KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1137else 1138KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1139endif 1140endif 1141 1142# arch Makefile may override CC so keep this after arch Makefile is included 1143NOSTDINC_FLAGS += -nostdinc 1144 1145# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1146# the kernel uses only C99 flexible arrays for dynamically sized trailing 1147# arrays. Enforce this for everything that may examine structure sizes and 1148# perform bounds checking. 1149KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1150 1151# disable invalid "can't wrap" optimizations for signed / pointers 1152KBUILD_CFLAGS += -fno-strict-overflow 1153 1154# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1155KBUILD_CFLAGS += -fno-stack-check 1156 1157# conserve stack if available 1158ifdef CONFIG_CC_IS_GCC 1159KBUILD_CFLAGS += -fconserve-stack 1160endif 1161 1162# Ensure compilers do not transform certain loops into calls to wcslen() 1163KBUILD_CFLAGS += -fno-builtin-wcslen 1164 1165CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1166ifdef CONFIG_CC_IS_GCC 1167CFLAGS_GCOV += -fno-tree-loop-im 1168# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1169# Only enable if -fprofile-update=prefer-atomic does not introduce new 1170# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1171CFLAGS_GCOV += $(call try-run,\ 1172 echo 'long long x; void f(void){x++;}' | \ 1173 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1174 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1175 echo 'long long x; void f(void){x++;}' | \ 1176 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1177 -ftest-coverage -fprofile-update=prefer-atomic \ 1178 -x c - -c -o "$$TMP" && \ 1179 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1180 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1181 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1182 -fprofile-update=prefer-atomic) 1183endif 1184export CFLAGS_GCOV 1185 1186# change __FILE__ to the relative path to the source directory 1187ifdef building_out_of_srctree 1188KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1189ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1190KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1191endif 1192endif 1193 1194# include additional Makefiles when needed 1195include-y := scripts/Makefile.warn 1196include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1197include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1198include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1199include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1200include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1201include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1202include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1203include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1204include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1205include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1206include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1207include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1208include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1209 1210include $(addprefix $(srctree)/, $(include-y)) 1211 1212# scripts/Makefile.gcc-plugins is intentionally included last. 1213# Do not add $(call cc-option,...) below this line. When you build the kernel 1214# from the clean source tree, the GCC plugins do not exist at this point. 1215 1216# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1217KBUILD_CPPFLAGS += $(KCPPFLAGS) 1218KBUILD_AFLAGS += $(KAFLAGS) 1219KBUILD_CFLAGS += $(KCFLAGS) 1220KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1221 1222KBUILD_LDFLAGS_MODULE += --build-id=sha1 1223LDFLAGS_vmlinux += --build-id=sha1 1224 1225KBUILD_LDFLAGS += -z noexecstack 1226ifeq ($(CONFIG_LD_IS_BFD),y) 1227KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1228endif 1229 1230ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1231LDFLAGS_vmlinux += -X 1232endif 1233 1234ifeq ($(CONFIG_RELR),y) 1235# ld.lld before 15 did not support -z pack-relative-relocs. 1236LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1237endif 1238 1239# We never want expected sections to be placed heuristically by the 1240# linker. All sections should be explicitly named in the linker script. 1241ifdef CONFIG_LD_ORPHAN_WARN 1242LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1243endif 1244 1245ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1246LDFLAGS_vmlinux += --emit-relocs --discard-none 1247endif 1248 1249# Align the architecture of userspace programs with the kernel 1250USERFLAGS_FROM_KERNEL := --target=% 1251 1252ifdef CONFIG_ARCH_USERFLAGS 1253KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1254KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1255else 1256# If not overridden also inherit the bit size 1257USERFLAGS_FROM_KERNEL += -m32 -m64 1258endif 1259 1260KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1261KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1262 1263# userspace programs are linked via the compiler, use the correct linker 1264ifdef CONFIG_CC_IS_CLANG 1265KBUILD_USERLDFLAGS += --ld-path=$(LD) 1266endif 1267 1268# make the checker run with the right architecture 1269CHECKFLAGS += --arch=$(ARCH) 1270 1271# insure the checker run with the right endianness 1272CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1273 1274# the checker needs the correct machine size 1275CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1276 1277# Validate the checker is available and functional 1278ifneq ($(KBUILD_CHECKSRC), 0) 1279 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1280 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1281 KBUILD_CHECKSRC = 0 1282 endif 1283endif 1284 1285# Default kernel image to build when no specific target is given. 1286# KBUILD_IMAGE may be overruled on the command line or 1287# set in the environment 1288# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1289# this default value 1290export KBUILD_IMAGE ?= vmlinux 1291 1292# 1293# INSTALL_PATH specifies where to place the updated kernel and system map 1294# images. Default is /boot, but you can set it to other values 1295export INSTALL_PATH ?= /boot 1296 1297# 1298# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1299# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1300# an argument if needed. Otherwise it defaults to the kernel install path 1301# 1302export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1303 1304# 1305# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1306# relocations required by build roots. This is not defined in the 1307# makefile but the argument can be passed to make if needed. 1308# 1309 1310MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1311export MODLIB 1312 1313PHONY += prepare0 1314 1315ifeq ($(KBUILD_EXTMOD),) 1316 1317build-dir := . 1318clean-dirs := $(sort . Documentation \ 1319 $(patsubst %/,%,$(filter %/, $(core-) \ 1320 $(drivers-) $(libs-)))) 1321 1322export ARCH_CORE := $(core-y) 1323export ARCH_LIB := $(filter %/, $(libs-y)) 1324export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1325# Externally visible symbols (used by link-vmlinux.sh) 1326 1327KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1328KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1329 1330export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1331export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1332 1333ifdef CONFIG_TRIM_UNUSED_KSYMS 1334# For the kernel to actually contain only the needed exported symbols, 1335# we have to build modules as well to determine what those symbols are. 1336KBUILD_MODULES := y 1337endif 1338 1339PHONY += vmlinux_a 1340vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1341 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1342 1343vmlinux.a: vmlinux_a 1344 @: 1345 1346PHONY += vmlinux_o 1347vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1348 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1349 1350vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1351 @: 1352 1353PHONY += vmlinux 1354# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1355# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1356# unrelated; the decompressors just happen to have the same base name, 1357# arch/*/boot/compressed/vmlinux. 1358# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1359# 1360# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1361# https://savannah.gnu.org/bugs/?61463 1362# For Make > 4.4, the following simple code will work: 1363# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1364vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1365vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1366vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1367 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1368 1369# The actual objects are generated when descending, 1370# make sure no implicit rule kicks in 1371$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1372 1373ifeq ($(origin KERNELRELEASE),file) 1374filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1375else 1376filechk_kernel.release = echo $(KERNELRELEASE) 1377endif 1378 1379# Store (new) KERNELRELEASE string in include/config/kernel.release 1380include/config/kernel.release: FORCE 1381 $(call filechk,kernel.release) 1382 1383# Additional helpers built in scripts/ 1384# Carefully list dependencies so we do not try to build scripts twice 1385# in parallel 1386PHONY += scripts 1387scripts: scripts_basic scripts_dtc 1388 $(Q)$(MAKE) $(build)=$(@) 1389 1390# Things we need to do before we recursively start building the kernel 1391# or the modules are listed in "prepare". 1392# A multi level approach is used. prepareN is processed before prepareN-1. 1393# archprepare is used in arch Makefiles and when processed asm symlink, 1394# version.h and scripts_basic is processed / created. 1395 1396PHONY += prepare archprepare 1397 1398archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1399 asm-generic $(version_h) include/generated/utsrelease.h \ 1400 include/generated/compile.h include/generated/autoconf.h \ 1401 include/generated/rustc_cfg remove-stale-files 1402 1403prepare0: archprepare 1404 $(Q)$(MAKE) $(build)=scripts/mod 1405 $(Q)$(MAKE) $(build)=. prepare 1406 1407# All the preparing.. 1408prepare: prepare0 1409ifdef CONFIG_RUST 1410 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1411 $(Q)$(MAKE) $(build)=rust 1412endif 1413 1414PHONY += remove-stale-files 1415remove-stale-files: 1416 $(Q)$(srctree)/scripts/remove-stale-files 1417 1418# Support for using generic headers in asm-generic 1419asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1420 1421PHONY += asm-generic uapi-asm-generic 1422asm-generic: uapi-asm-generic 1423 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1424 generic=include/asm-generic 1425uapi-asm-generic: 1426 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1427 generic=include/uapi/asm-generic 1428 1429# Generate some files 1430# --------------------------------------------------------------------------- 1431 1432# KERNELRELEASE can change from a few different places, meaning version.h 1433# needs to be updated, so this check is forced on all builds 1434 1435uts_len := 64 1436define filechk_utsrelease.h 1437 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1438 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1439 exit 1; \ 1440 fi; \ 1441 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1442endef 1443 1444define filechk_version.h 1445 if [ $(SUBLEVEL) -gt 255 ]; then \ 1446 echo \#define LINUX_VERSION_CODE $(shell \ 1447 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1448 else \ 1449 echo \#define LINUX_VERSION_CODE $(shell \ 1450 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1451 fi; \ 1452 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1453 ((c) > 255 ? 255 : (c)))'; \ 1454 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1455 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1456 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1457endef 1458 1459$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1460$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1461$(version_h): FORCE 1462 $(call filechk,version.h) 1463 1464include/generated/utsrelease.h: include/config/kernel.release FORCE 1465 $(call filechk,utsrelease.h) 1466 1467filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1468 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1469 1470include/generated/compile.h: FORCE 1471 $(call filechk,compile.h) 1472 1473PHONY += headerdep 1474headerdep: 1475 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1476 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1477 1478# --------------------------------------------------------------------------- 1479# Kernel headers 1480 1481#Default location for installed headers 1482export INSTALL_HDR_PATH = $(objtree)/usr 1483 1484quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1485 cmd_headers_install = \ 1486 mkdir -p $(INSTALL_HDR_PATH); \ 1487 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1488 usr/include $(INSTALL_HDR_PATH) 1489 1490PHONY += headers_install 1491headers_install: headers 1492 $(call cmd,headers_install) 1493 1494PHONY += archheaders archscripts 1495 1496hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1497 1498PHONY += headers 1499headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1500ifdef HEADER_ARCH 1501 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1502else 1503 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1504 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1505endif 1506 1507ifdef CONFIG_HEADERS_INSTALL 1508prepare: headers 1509endif 1510 1511PHONY += usr_gen_init_cpio 1512usr_gen_init_cpio: scripts_basic 1513 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1514 1515PHONY += scripts_unifdef 1516scripts_unifdef: scripts_basic 1517 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1518 1519PHONY += scripts_gen_packed_field_checks 1520scripts_gen_packed_field_checks: scripts_basic 1521 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1522 1523# --------------------------------------------------------------------------- 1524# Install 1525 1526# Many distributions have the custom install script, /sbin/installkernel. 1527# If DKMS is installed, 'make install' will eventually recurse back 1528# to this Makefile to build and install external modules. 1529# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1530 1531quiet_cmd_install = INSTALL $(INSTALL_PATH) 1532 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1533 1534# --------------------------------------------------------------------------- 1535# vDSO install 1536 1537PHONY += vdso_install 1538vdso_install: export INSTALL_FILES = $(vdso-install-y) 1539vdso_install: 1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1541 1542# --------------------------------------------------------------------------- 1543# Tools 1544 1545ifdef CONFIG_OBJTOOL 1546prepare: tools/objtool 1547endif 1548 1549ifdef CONFIG_BPF 1550ifdef CONFIG_DEBUG_INFO_BTF 1551prepare: tools/bpf/resolve_btfids 1552endif 1553endif 1554 1555# tools/bootconfig renders the embedded bootconfig into a cmdline at build time. 1556ifdef CONFIG_CMDLINE_FROM_BOOTCONFIG 1557prepare: tools/bootconfig 1558endif 1559 1560# tools/bootconfig is run on the build host during prepare, so force a host 1561# binary here; its own Makefile keeps $(CC) for standalone and cross builds. 1562# CROSS_COMPILE= is cleared so tools/scripts/Makefile.include does not inject 1563# the target's --target=/--sysroot= flags into the host clang invocation under 1564# LLVM=1 cross builds (which would produce a target binary that fails to exec). 1565tools/bootconfig: export CC := $(HOSTCC) 1566tools/bootconfig: FORCE 1567 $(Q)mkdir -p $(objtree)/tools 1568 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ \ 1569 bootconfig CROSS_COMPILE= 1570 1571# The tools build system is not a part of Kbuild and tends to introduce 1572# its own unique issues. If you need to integrate a new tool into Kbuild, 1573# please consider locating that tool outside the tools/ tree and using the 1574# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1575# here. See Documentation/kbuild/makefiles.rst for details. 1576 1577PHONY += resolve_btfids_clean 1578 1579resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1580 1581# tools/bpf/resolve_btfids directory might not exist 1582# in output directory, skip its clean in that case 1583resolve_btfids_clean: 1584ifneq ($(wildcard $(resolve_btfids_O)),) 1585 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1586endif 1587 1588PHONY += objtool_clean objtool_mrproper 1589 1590objtool_O = $(abspath $(objtree))/tools/objtool 1591 1592objtool_clean objtool_mrproper: 1593ifneq ($(wildcard $(objtool_O)),) 1594 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1595endif 1596 1597PHONY += bootconfig_clean 1598 1599bootconfig_O = $(abspath $(objtree))/tools/bootconfig 1600 1601bootconfig_clean: 1602ifneq ($(wildcard $(bootconfig_O)),) 1603 $(Q)$(MAKE) -sC $(srctree)/tools/bootconfig O=$(bootconfig_O) clean 1604endif 1605 1606tools/: FORCE 1607 $(Q)mkdir -p $(objtree)/tools 1608 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1609 1610tools/%: FORCE 1611 $(Q)mkdir -p $(objtree)/tools 1612 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1613 1614# --------------------------------------------------------------------------- 1615# Kernel selftest 1616 1617PHONY += kselftest 1618kselftest: headers 1619 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1620 1621kselftest-%: headers FORCE 1622 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1623 1624PHONY += kselftest-merge 1625kselftest-merge: 1626 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1627 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1628 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1629 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1630 1631# --------------------------------------------------------------------------- 1632# Devicetree files 1633 1634ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1635dtstree := arch/$(SRCARCH)/boot/dts 1636endif 1637 1638dtbindingtree := Documentation/devicetree/bindings 1639 1640%.yaml: dtbs_prepare 1641 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1642 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1643 1644ifneq ($(dtstree),) 1645 1646%.dtb: dtbs_prepare 1647 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1648 1649%.dtbo: dtbs_prepare 1650 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1651 1652PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1653dtbs: dtbs_prepare 1654 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1655 1656# include/config/kernel.release is actually needed when installing DTBs because 1657# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1658# dtbs_install depend on it as dtbs_install may run as root. 1659dtbs_prepare: include/config/kernel.release scripts_dtc 1660 1661ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1662export CHECK_DTBS=y 1663endif 1664 1665ifneq ($(CHECK_DTBS),) 1666dtbs_prepare: dt_binding_schemas 1667endif 1668 1669dtbs_check: dtbs 1670 1671dtbs_install: 1672 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1673 1674ifdef CONFIG_OF_EARLY_FLATTREE 1675all: dtbs 1676endif 1677 1678ifdef CONFIG_GENERIC_BUILTIN_DTB 1679vmlinux: dtbs 1680endif 1681 1682endif 1683 1684PHONY += scripts_dtc 1685scripts_dtc: scripts_basic 1686 $(Q)$(MAKE) $(build)=scripts/dtc 1687 1688ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1689export CHECK_DTBS=y 1690endif 1691 1692PHONY += dt_binding_check dt_binding_schemas 1693dt_binding_check: dt_binding_schemas scripts_dtc 1694 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1695 1696dt_binding_schemas: 1697 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1698 1699PHONY += dt_compatible_check 1700dt_compatible_check: dt_binding_schemas 1701 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1702 1703PHONY += dt_style_selftest 1704dt_style_selftest: 1705 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1706 1707# --------------------------------------------------------------------------- 1708# Modules 1709 1710ifdef CONFIG_MODULES 1711 1712# By default, build modules as well 1713 1714all: modules 1715 1716# When we're building modules with modversions, we need to consider 1717# the built-in objects during the descend as well, in order to 1718# make sure the checksums are up to date before we record them. 1719ifdef CONFIG_MODVERSIONS 1720 KBUILD_BUILTIN := y 1721endif 1722 1723# Build modules 1724# 1725 1726# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1727# is an exception. 1728ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1729KBUILD_BUILTIN := y 1730modules: vmlinux 1731endif 1732 1733modules: modules_prepare 1734 1735# Target to prepare building external modules 1736modules_prepare: prepare 1737 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1738 1739endif # CONFIG_MODULES 1740 1741### 1742# Cleaning is done on three levels. 1743# make clean Delete most generated files 1744# Leave enough to build external modules 1745# make mrproper Delete the current configuration, and all generated files 1746# make distclean Remove editor backup files, patch leftover files and the like 1747 1748# Directories & files removed with 'make clean' 1749CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1750 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1751 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1752 vmlinux.thinlto-index builtin.order \ 1753 compile_commands.json rust/test \ 1754 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1755 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1756 1757# Directories & files removed with 'make mrproper' 1758MRPROPER_FILES += include/config include/generated \ 1759 arch/$(SRCARCH)/include/generated .objdiff \ 1760 debian snap tar-install PKGBUILD pacman \ 1761 .config .config.old .version \ 1762 Module.symvers \ 1763 certs/signing_key.pem \ 1764 certs/x509.genkey \ 1765 vmlinux-gdb.py \ 1766 rpmbuild \ 1767 rust/libmacros.so rust/libmacros.dylib \ 1768 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1769 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1770 1771# clean - Delete most, but leave enough to build external modules 1772# 1773clean: private rm-files := $(CLEAN_FILES) 1774 1775PHONY += archclean vmlinuxclean 1776 1777vmlinuxclean: 1778 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1779 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1780 1781clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean bootconfig_clean 1782 1783# mrproper - Delete all generated files, including .config 1784# 1785mrproper: private rm-files := $(MRPROPER_FILES) 1786mrproper-dirs := $(addprefix _mrproper_,scripts) 1787 1788PHONY += $(mrproper-dirs) mrproper 1789$(mrproper-dirs): 1790 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1791 1792mrproper: clean objtool_mrproper $(mrproper-dirs) 1793 $(call cmd,rmfiles) 1794 @find . $(RCS_FIND_IGNORE) \ 1795 \( -name '*.rmeta' \) \ 1796 -type f -print | xargs rm -f 1797 1798# distclean 1799# 1800PHONY += distclean 1801 1802distclean: mrproper 1803 @find . $(RCS_FIND_IGNORE) \ 1804 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1805 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1806 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1807 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1808 -type f -print | xargs rm -f 1809 1810 1811# Packaging of the kernel to various formats 1812# --------------------------------------------------------------------------- 1813 1814modules-cpio-pkg: usr_gen_init_cpio 1815 1816%src-pkg: FORCE 1817 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1818%pkg: include/config/kernel.release FORCE 1819 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1820 1821# Brief documentation of the typical targets used 1822# --------------------------------------------------------------------------- 1823 1824boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1825boards := $(sort $(notdir $(boards))) 1826board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1827board-dirs := $(sort $(notdir $(board-dirs:/=))) 1828 1829PHONY += help 1830help: 1831 @echo 'Cleaning targets:' 1832 @echo ' clean - Remove most generated files but keep the config and' 1833 @echo ' enough build support to build external modules' 1834 @echo ' mrproper - Remove all generated files + config + various backup files' 1835 @echo ' distclean - mrproper + remove editor backup and patch files' 1836 @echo '' 1837 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1838 @echo '' 1839 @echo 'Other generic targets:' 1840 @echo ' all - Build all targets marked with [*]' 1841 @echo '* vmlinux - Build the bare kernel' 1842 @echo '* modules - Build all modules' 1843 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1844 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1845 @echo ' dir/ - Build all files in dir and below' 1846 @echo ' dir/file.[ois] - Build specified target only' 1847 @echo ' dir/file.ll - Build the LLVM assembly file' 1848 @echo ' (requires compiler support for LLVM assembly generation)' 1849 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1850 @echo ' (requires a recent binutils and recent build (System.map))' 1851 @echo ' dir/file.ko - Build module including final link' 1852 @echo ' modules_prepare - Set up for building external modules' 1853 @echo ' tags/TAGS - Generate tags file for editors' 1854 @echo ' cscope - Generate cscope index' 1855 @echo ' gtags - Generate GNU GLOBAL index' 1856 @echo ' kernelrelease - Output the release version string (use with make -s)' 1857 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1858 @echo ' image_name - Output the image name (use with make -s)' 1859 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1860 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1861 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1862 echo '' 1863 @echo 'Static analysers:' 1864 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1865 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1866 @echo ' versioncheck - Sanity check on version.h usage' 1867 @echo ' includecheck - Check for duplicate included header files' 1868 @echo ' headerdep - Detect inclusion cycles in headers' 1869 @echo ' coccicheck - Check with Coccinelle' 1870 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1871 @echo ' clang-analyzer - Check with clang static analyzer' 1872 @echo ' clang-tidy - Check with clang-tidy' 1873 @echo '' 1874 @echo 'Tools:' 1875 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1876 @echo ' sbom - Generate Software Bill of Materials' 1877 @echo '' 1878 @echo 'Kernel selftest:' 1879 @echo ' kselftest - Build and run kernel selftest' 1880 @echo ' Build, install, and boot kernel before' 1881 @echo ' running kselftest on it' 1882 @echo ' Run as root for full coverage' 1883 @echo ' kselftest-all - Build kernel selftest' 1884 @echo ' kselftest-install - Build and install kernel selftest' 1885 @echo ' kselftest-clean - Remove all generated kselftest files' 1886 @echo ' kselftest-merge - Merge all the config dependencies of' 1887 @echo ' kselftest to existing .config.' 1888 @echo '' 1889 @echo 'Rust targets:' 1890 @echo ' rustavailable - Checks whether the Rust toolchain is' 1891 @echo ' available and, if not, explains why.' 1892 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1893 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1894 @echo ' is formatted, printing a diff otherwise.' 1895 @echo ' rustdoc - Generate Rust documentation' 1896 @echo ' (requires kernel .config)' 1897 @echo ' rusttest - Runs the Rust tests' 1898 @echo ' (requires kernel .config; downloads external repos)' 1899 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1900 @echo ' (requires kernel .config)' 1901 @echo ' dir/file.[os] - Build specified target only' 1902 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1903 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1904 @echo ' The output is not intended to be compilable.' 1905 @echo ' dir/file.ll - Build the LLVM assembly file' 1906 @echo '' 1907 @$(if $(dtstree), \ 1908 echo 'Devicetree:'; \ 1909 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1910 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1911 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1912 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1913 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1914 echo ' dtbs_check - Validate device tree source files';\ 1915 echo '') 1916 1917 @echo 'Userspace tools targets:' 1918 @echo ' use "make tools/help"' 1919 @echo ' or "cd tools; make help"' 1920 @echo '' 1921 @echo 'Kernel packaging:' 1922 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1923 @echo '' 1924 @echo 'Documentation targets:' 1925 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1926 @echo '' 1927 @echo 'Architecture-specific targets ($(SRCARCH)):' 1928 @$(or $(archhelp),\ 1929 echo ' No architecture-specific help defined for $(SRCARCH)') 1930 @echo '' 1931 @$(if $(boards), \ 1932 $(foreach b, $(boards), \ 1933 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1934 echo '') 1935 @$(if $(board-dirs), \ 1936 $(foreach b, $(board-dirs), \ 1937 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1938 printf " %-16s - Show all of the above\\n" help-boards; \ 1939 echo '') 1940 1941 @echo ' make V=n [targets] 1: verbose build' 1942 @echo ' 2: give reason for rebuild of target' 1943 @echo ' V=1 and V=2 can be combined with V=12' 1944 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1945 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1946 @echo ' (sparse by default)' 1947 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1948 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1949 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1950 @echo ' 1: warnings which may be relevant and do not occur too often' 1951 @echo ' 2: warnings which occur quite often but may still be relevant' 1952 @echo ' 3: more obscure warnings, can most likely be ignored' 1953 @echo ' c: extra checks in the configuration stage (Kconfig)' 1954 @echo ' e: warnings are being treated as errors' 1955 @echo ' Multiple levels can be combined with W=12 or W=123' 1956 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1957 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1958 @$(if $(dtstree), \ 1959 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1960 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1961 ) 1962 @echo '' 1963 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1964 @echo 'For further info see the ./README file' 1965 1966 1967help-board-dirs := $(addprefix help-,$(board-dirs)) 1968 1969help-boards: $(help-board-dirs) 1970 1971boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1972 1973$(help-board-dirs): help-%: 1974 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1975 @$(if $(boards-per-dir), \ 1976 $(foreach b, $(boards-per-dir), \ 1977 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1978 echo '') 1979 1980 1981# Documentation targets 1982# --------------------------------------------------------------------------- 1983DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1984 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1985 htmldocs-redirects 1986 1987PHONY += $(DOC_TARGETS) 1988$(DOC_TARGETS): 1989 $(Q)$(MAKE) $(build)=Documentation $@ 1990 1991 1992# Rust targets 1993# --------------------------------------------------------------------------- 1994 1995# "Is Rust available?" target 1996PHONY += rustavailable 1997rustavailable: 1998 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1999 2000# Documentation target 2001# 2002# Using the singular to avoid running afoul of `no-dot-config-targets`. 2003PHONY += rustdoc 2004rustdoc: prepare 2005 $(Q)$(MAKE) $(build)=rust $@ 2006 2007# Testing target 2008PHONY += rusttest 2009rusttest: prepare 2010 $(Q)$(MAKE) $(build)=rust $@ 2011 2012# Formatting targets 2013# 2014# Generated files as well as vendored crates are skipped. 2015PHONY += rustfmt rustfmtcheck 2016 2017rustfmt: 2018 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 2019 \( \ 2020 -path $(srctree)/rust/proc-macro2 \ 2021 -o -path $(srctree)/rust/quote \ 2022 -o -path $(srctree)/rust/syn \ 2023 -o -path $(srctree)/rust/zerocopy \ 2024 -o -path $(srctree)/rust/zerocopy-derive \ 2025 \) -prune -o \ 2026 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2027 | xargs $(RUSTFMT) $(rustfmt_flags) 2028 2029rustfmtcheck: rustfmt_flags = --check 2030rustfmtcheck: rustfmt 2031 2032# Misc 2033# --------------------------------------------------------------------------- 2034 2035PHONY += misc-check 2036misc-check: 2037 $(Q)$(srctree)/scripts/misc-check 2038 2039all: misc-check 2040 2041PHONY += scripts_gdb 2042scripts_gdb: prepare0 2043 $(Q)$(MAKE) $(build)=scripts/gdb 2044 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2045 2046ifdef CONFIG_GDB_SCRIPTS 2047all: scripts_gdb 2048endif 2049 2050else # KBUILD_EXTMOD 2051 2052filechk_kernel.release = echo $(KERNELRELEASE) 2053 2054### 2055# External module support. 2056# When building external modules the kernel used as basis is considered 2057# read-only, and no consistency checks are made and the make 2058# system is not used on the basis kernel. If updates are required 2059# in the basis kernel ordinary make commands (without M=...) must be used. 2060 2061# We are always building only modules. 2062KBUILD_BUILTIN := 2063KBUILD_MODULES := y 2064 2065build-dir := . 2066 2067clean-dirs := . 2068clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2069 2070PHONY += prepare 2071# now expand this into a simple variable to reduce the cost of shell evaluations 2072prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2073prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2074prepare: 2075 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2076 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2077 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2078 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2079 fi 2080 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2081 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2082 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2083 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2084 fi 2085 2086PHONY += help 2087help: 2088 @echo ' Building external modules.' 2089 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2090 @echo '' 2091 @echo ' modules - default target, build the module(s)' 2092 @echo ' modules_install - install the module' 2093 @echo ' clean - remove generated files in module directory only' 2094 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2095 @echo '' 2096 2097ifndef CONFIG_MODULES 2098modules modules_install: __external_modules_error 2099__external_modules_error: 2100 @echo >&2 '***' 2101 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2102 @echo >&2 '*** You cannot build or install external modules.' 2103 @echo >&2 '***' 2104 @false 2105endif 2106 2107endif # KBUILD_EXTMOD 2108 2109# --------------------------------------------------------------------------- 2110# Modules 2111 2112PHONY += modules modules_install modules_sign modules_prepare 2113 2114modules_install: 2115 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2116 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2117 2118ifeq ($(CONFIG_MODULE_SIG),y) 2119# modules_sign is a subset of modules_install. 2120# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2121modules_sign: modules_install 2122 @: 2123else 2124modules_sign: 2125 @echo >&2 '***' 2126 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2127 @echo >&2 '***' 2128 @false 2129endif 2130 2131ifdef CONFIG_MODULES 2132 2133modules.order: $(build-dir) 2134 @: 2135 2136# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2137# This is solely useful to speed up test compiles. 2138modules: modpost 2139ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2140 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2141endif 2142 2143PHONY += modules_check 2144modules_check: modules.order 2145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2146 2147else # CONFIG_MODULES 2148 2149modules: 2150 @: 2151 2152KBUILD_MODULES := 2153 2154endif # CONFIG_MODULES 2155 2156PHONY += modpost 2157modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2158 $(if $(KBUILD_MODULES), modules_check) 2159 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2160 2161# Single targets 2162# --------------------------------------------------------------------------- 2163# To build individual files in subdirectories, you can do like this: 2164# 2165# make foo/bar/baz.s 2166# 2167# The supported suffixes for single-target are listed in 'single-targets' 2168# 2169# To build only under specific subdirectories, you can do like this: 2170# 2171# make foo/bar/baz/ 2172 2173ifdef single-build 2174 2175# .ko is special because modpost is needed 2176single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2177single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2178 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2179 2180$(single-ko): single_modules 2181 @: 2182$(single-no-ko): $(build-dir) 2183 @: 2184 2185# Remove modules.order when done because it is not the real one. 2186PHONY += single_modules 2187single_modules: $(single-no-ko) modules_prepare 2188 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2189 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2190ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2191 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2192endif 2193 $(Q)rm -f modules.order 2194 2195single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2196 2197KBUILD_MODULES := y 2198 2199endif 2200 2201prepare: outputmakefile 2202 2203# Preset locale variables to speed up the build process. Limit locale 2204# tweaks to this spot to avoid wrong language settings when running 2205# make menuconfig etc. 2206# Error messages still appears in the original language 2207PHONY += $(build-dir) 2208$(build-dir): prepare 2209 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2210 2211clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2212PHONY += $(clean-dirs) clean 2213$(clean-dirs): 2214 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2215 2216clean: $(clean-dirs) 2217 $(call cmd,rmfiles) 2218 @find . $(RCS_FIND_IGNORE) \ 2219 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2220 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2221 -o -name '*.dtb' -o -name '*.dtbo' \ 2222 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2223 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2224 -o -name '*.dwo' -o -name '*.lst' \ 2225 -o -name '*.su' -o -name '*.mod' \ 2226 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2227 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2228 -o -name '*.asn1.[ch]' \ 2229 -o -name '*.symtypes' -o -name 'modules.order' \ 2230 -o -name '*.c.[012]*.*' \ 2231 -o -name '*.ll' \ 2232 -o -name '*.gcno' \ 2233 -o -name '*.long-type-*.txt' \ 2234 \) -type f -print \ 2235 -o -name '.tmp_*' -print \ 2236 | xargs rm -rf 2237 2238# Generate tags for editors 2239# --------------------------------------------------------------------------- 2240quiet_cmd_tags = GEN $@ 2241 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2242 2243tags TAGS cscope gtags: FORCE 2244 $(call cmd,tags) 2245 2246# Generate rust-project.json (a file that describes the structure of non-Cargo 2247# Rust projects) for rust-analyzer (an implementation of the Language Server 2248# Protocol). 2249PHONY += rust-analyzer 2250rust-analyzer: 2251 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2252ifdef KBUILD_EXTMOD 2253# FIXME: external modules must not descend into a sub-directory of the kernel 2254 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2255else 2256 $(Q)$(MAKE) $(build)=rust $@ 2257endif 2258 2259# Script to generate missing namespace dependencies 2260# --------------------------------------------------------------------------- 2261 2262PHONY += nsdeps 2263nsdeps: export KBUILD_NSDEPS=1 2264nsdeps: modules 2265 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2266 2267# Script to generate .spdx.json SBOM documents describing the build 2268# --------------------------------------------------------------------------- 2269 2270ifdef building_out_of_srctree 2271sbom_targets := sbom-source.spdx.json 2272endif 2273sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2274quiet_cmd_sbom = GEN $(sbom_targets) 2275 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2276 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2277 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2278 --src-tree $(abspath $(srctree)) \ 2279 --obj-tree $(abspath $(objtree)) \ 2280 --roots-file "$(tmp-target)" \ 2281 --output-directory $(abspath $(objtree)) \ 2282 --generate-spdx \ 2283 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2284 --package-version "$(KERNELVERSION)" \ 2285 --write-output-on-error; 2286PHONY += sbom 2287sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2288 $(call cmd,sbom) 2289 2290# Clang Tooling 2291# --------------------------------------------------------------------------- 2292 2293quiet_cmd_gen_compile_commands = GEN $@ 2294 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2295 2296compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2297 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2298 $(if $(CONFIG_MODULES), modules.order) FORCE 2299 $(call if_changed,gen_compile_commands) 2300 2301targets += compile_commands.json 2302 2303PHONY += clang-tidy clang-analyzer 2304 2305ifdef CONFIG_CC_IS_CLANG 2306quiet_cmd_clang_tools = CHECK $< 2307 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2308 2309clang-tidy clang-analyzer: compile_commands.json 2310 $(call cmd,clang_tools) 2311else 2312clang-tidy clang-analyzer: 2313 @echo "$@ requires CC=clang" >&2 2314 @false 2315endif 2316 2317# Scripts to check various things for consistency 2318# --------------------------------------------------------------------------- 2319 2320PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2321 2322includecheck: 2323 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2324 -name '*.[hcS]' -type f -print | sort \ 2325 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2326 2327versioncheck: 2328 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2329 -name '*.[hcS]' -type f -print | sort \ 2330 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2331 2332coccicheck: 2333 $(Q)$(BASH) $(srctree)/scripts/$@ 2334 2335kconfig-sym-check: 2336 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2337 2338PHONY += checkstack kernelrelease kernelversion image_name 2339 2340# UML needs a little special treatment here. It wants to use the host 2341# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2342# else wants $(ARCH), including people doing cross-builds, which means 2343# that $(SUBARCH) doesn't work here. 2344ifeq ($(ARCH), um) 2345CHECKSTACK_ARCH := $(SUBARCH) 2346else 2347CHECKSTACK_ARCH := $(ARCH) 2348endif 2349MINSTACKSIZE ?= 100 2350checkstack: 2351 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2352 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2353 2354kernelrelease: 2355 @$(filechk_kernel.release) 2356 2357kernelversion: 2358 @echo $(KERNELVERSION) 2359 2360image_name: 2361 @echo $(KBUILD_IMAGE) 2362 2363PHONY += run-command 2364run-command: 2365 $(Q)$(KBUILD_RUN_COMMAND) 2366 2367quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2368 cmd_rmfiles = rm -rf $(rm-files) 2369 2370# read saved command lines for existing targets 2371existing-targets := $(wildcard $(sort $(targets))) 2372 2373-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2374 2375endif # config-build 2376endif # mixed-build 2377endif # need-sub-make 2378 2379PHONY += FORCE 2380FORCE: 2381 2382# Declare the contents of the PHONY variable as phony. We keep that 2383# information in a variable so we can use it in if_changed and friends. 2384.PHONY: $(PHONY) 2385