1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 3 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 kconfig-sym-check \ 297 $(version_h) headers headers_% archheaders archscripts \ 298 %asm-generic kernelversion %src-pkg dt_binding_check \ 299 dt_style_selftest \ 300 outputmakefile rustavailable rustfmt rustfmtcheck \ 301 run-command 302no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 303 image_name 304single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 305 306config-build := 307mixed-build := 308need-config := 1 309may-sync-config := 1 310single-build := 311 312ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 313 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 314 need-config := 315 endif 316endif 317 318ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 319 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 320 may-sync-config := 321 endif 322endif 323 324need-compiler := $(may-sync-config) 325 326ifneq ($(KBUILD_EXTMOD),) 327 may-sync-config := 328endif 329 330ifeq ($(KBUILD_EXTMOD),) 331 ifneq ($(filter %config,$(MAKECMDGOALS)),) 332 config-build := 1 333 ifneq ($(words $(MAKECMDGOALS)),1) 334 mixed-build := 1 335 endif 336 endif 337endif 338 339# We cannot build single targets and the others at the same time 340ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 341 single-build := 1 342 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 343 mixed-build := 1 344 endif 345endif 346 347# For "make -j clean all", "make -j mrproper defconfig all", etc. 348ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 349 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 350 mixed-build := 1 351 endif 352endif 353 354# install and modules_install need also be processed one by one 355ifneq ($(filter install,$(MAKECMDGOALS)),) 356 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 357 mixed-build := 1 358 endif 359endif 360 361ifdef mixed-build 362# =========================================================================== 363# We're called with mixed targets (*config and build targets). 364# Handle them one by one. 365 366PHONY += $(MAKECMDGOALS) __build_one_by_one 367 368$(MAKECMDGOALS): __build_one_by_one 369 @: 370 371__build_one_by_one: 372 $(Q)set -e; \ 373 for i in $(MAKECMDGOALS); do \ 374 $(MAKE) -f $(srctree)/Makefile $$i; \ 375 done 376 377else # !mixed-build 378 379include $(srctree)/scripts/Kbuild.include 380 381# Read KERNELRELEASE from include/config/kernel.release (if it exists) 382KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 383KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 384export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 385 386include $(srctree)/scripts/subarch.include 387 388# Cross compiling and selecting different set of gcc/bin-utils 389# --------------------------------------------------------------------------- 390# 391# When performing cross compilation for other architectures ARCH shall be set 392# to the target architecture. (See arch/* for the possibilities). 393# ARCH can be set during invocation of make: 394# make ARCH=arm64 395# Another way is to have ARCH set in the environment. 396# The default ARCH is the host where make is executed. 397 398# CROSS_COMPILE specify the prefix used for all executables used 399# during compilation. Only gcc and related bin-utils executables 400# are prefixed with $(CROSS_COMPILE). 401# CROSS_COMPILE can be set on the command line 402# make CROSS_COMPILE=aarch64-linux-gnu- 403# Alternatively CROSS_COMPILE can be set in the environment. 404# Default value for CROSS_COMPILE is not to prefix executables 405# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 406ARCH ?= $(SUBARCH) 407 408# Architecture as present in compile.h 409UTS_MACHINE := $(ARCH) 410SRCARCH := $(ARCH) 411 412# Additional ARCH settings for x86 413ifeq ($(ARCH),i386) 414 SRCARCH := x86 415endif 416ifeq ($(ARCH),x86_64) 417 SRCARCH := x86 418endif 419 420# Additional ARCH settings for sparc 421ifeq ($(ARCH),sparc32) 422 SRCARCH := sparc 423endif 424ifeq ($(ARCH),sparc64) 425 SRCARCH := sparc 426endif 427 428# Additional ARCH settings for parisc 429ifeq ($(ARCH),parisc64) 430 SRCARCH := parisc 431endif 432 433export cross_compiling := 434ifneq ($(SRCARCH),$(SUBARCH)) 435cross_compiling := 1 436endif 437 438KCONFIG_CONFIG ?= .config 439export KCONFIG_CONFIG 440 441# SHELL used by kbuild 442CONFIG_SHELL := sh 443 444HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 445HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 446HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 447 448ifneq ($(LLVM),) 449ifneq ($(filter %/,$(LLVM)),) 450LLVM_PREFIX := $(LLVM) 451else ifneq ($(filter -%,$(LLVM)),) 452LLVM_SUFFIX := $(LLVM) 453else ifneq ($(LLVM),1) 454$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 455endif 456 457HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 458HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 459else 460HOSTCC = gcc 461HOSTCXX = g++ 462endif 463HOSTRUSTC = rustc 464HOSTPKG_CONFIG = pkg-config 465 466# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 467# has a logic to call it 468KERNELDOC = $(srctree)/tools/docs/kernel-doc 469export KERNELDOC 470 471KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 472 -O2 -fomit-frame-pointer -std=gnu11 473KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 474KBUILD_USERLDFLAGS := $(USERLDFLAGS) 475 476# These flags apply to all Rust code in the tree, including the kernel and 477# host programs. 478# 479# `-Aclippy::comparison_chain`: the lint has been demoted since 1.87. 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 -Aclippy::comparison_chain \ 499 -Wclippy::ignored_unit_patterns \ 500 -Aclippy::incompatible_msrv \ 501 -Wclippy::mut_mut \ 502 -Wclippy::needless_bitwise_bool \ 503 -Aclippy::needless_lifetimes \ 504 -Wclippy::no_mangle_with_rust_abi \ 505 -Wclippy::ptr_as_ptr \ 506 -Wclippy::ptr_cast_constness \ 507 -Wclippy::ref_as_ptr \ 508 -Wclippy::undocumented_unsafe_blocks \ 509 -Aclippy::uninlined_format_args \ 510 -Wclippy::unnecessary_safety_comment \ 511 -Wclippy::unnecessary_safety_doc \ 512 -Aclippy::unwrap_or_default \ 513 -Wrustdoc::missing_crate_level_docs \ 514 -Wrustdoc::unescaped_backticks 515 516KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 517 $(HOSTCFLAGS) -I $(srctree)/scripts/include 518KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 519 -I $(srctree)/scripts/include 520KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 521 -Zallow-features= 522KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 523KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 524KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 525 526# Make variables (CC, etc...) 527CPP = $(CC) -E 528ifneq ($(LLVM),) 529CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 530LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 531AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 532LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 533NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 534OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 535OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 536READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 537STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 538ifeq ($(filter -fuse-ld=% --ld-path=%,$(KBUILD_HOSTLDFLAGS)),) 539KBUILD_HOSTLDFLAGS += -fuse-ld=lld 540endif 541else 542CC = $(CROSS_COMPILE)gcc 543LD = $(CROSS_COMPILE)ld 544AR = $(CROSS_COMPILE)ar 545NM = $(CROSS_COMPILE)nm 546OBJCOPY = $(CROSS_COMPILE)objcopy 547OBJDUMP = $(CROSS_COMPILE)objdump 548READELF = $(CROSS_COMPILE)readelf 549STRIP = $(CROSS_COMPILE)strip 550endif 551RUSTC = rustc 552RUSTDOC = rustdoc 553RUSTFMT = rustfmt 554CLIPPY_DRIVER = clippy-driver 555BINDGEN = bindgen 556PAHOLE = pahole 557RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 558LEX = flex 559YACC = bison 560AWK = awk 561INSTALLKERNEL := installkernel 562PERL = perl 563PYTHON3 = python3 564CHECK = sparse 565BASH = bash 566KGZIP = gzip 567KBZIP2 = bzip2 568KLZOP = lzop 569LZMA = lzma 570LZ4 = lz4 571XZ = xz 572ZSTD = zstd 573TAR = tar 574 575CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 576 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 577NOSTDINC_FLAGS := 578CFLAGS_MODULE = 579RUSTFLAGS_MODULE = 580AFLAGS_MODULE = 581LDFLAGS_MODULE = 582CFLAGS_KERNEL = 583RUSTFLAGS_KERNEL = 584AFLAGS_KERNEL = 585LDFLAGS_vmlinux = 586 587# Use USERINCLUDE when you must reference the UAPI directories only. 588USERINCLUDE := \ 589 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 590 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 591 -I$(srctree)/include/uapi \ 592 -I$(objtree)/include/generated/uapi \ 593 -include $(srctree)/include/linux/compiler-version.h \ 594 -include $(srctree)/include/linux/kconfig.h 595 596# Use LINUXINCLUDE when you must reference the include/ directory. 597# Needed to be compatible with the O= option 598LINUXINCLUDE := \ 599 -I$(srctree)/arch/$(SRCARCH)/include \ 600 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 601 -I$(srctree)/include \ 602 -I$(objtree)/include \ 603 $(USERINCLUDE) 604 605KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 606 607KBUILD_CFLAGS := 608KBUILD_CFLAGS += -fshort-wchar 609KBUILD_CFLAGS += -funsigned-char 610KBUILD_CFLAGS += -fno-common 611KBUILD_CFLAGS += -fno-PIE 612KBUILD_CFLAGS += -fno-strict-aliasing 613 614KBUILD_CPPFLAGS := -D__KERNEL__ 615KBUILD_RUSTFLAGS := $(rust_common_flags) \ 616 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 617 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 618 -Csymbol-mangling-version=v0 \ 619 -Crelocation-model=static \ 620 -Zfunction-sections=n \ 621 -Wclippy::float_arithmetic 622KBUILD_RUSTFLAGS_OPTION_CHKS := 623 624KBUILD_AFLAGS_KERNEL := 625KBUILD_CFLAGS_KERNEL := 626KBUILD_RUSTFLAGS_KERNEL := 627KBUILD_AFLAGS_MODULE := -DMODULE 628KBUILD_CFLAGS_MODULE := -DMODULE 629KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 630KBUILD_LDFLAGS_MODULE := 631KBUILD_LDFLAGS := 632CLANG_FLAGS := 633 634ifeq ($(KBUILD_CLIPPY),1) 635 RUSTC_OR_CLIPPY_QUIET := CLIPPY 636 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 637else 638 RUSTC_OR_CLIPPY_QUIET := RUSTC 639 RUSTC_OR_CLIPPY = $(RUSTC) 640endif 641 642# Allows the usage of unstable features in stable compilers. 643export RUSTC_BOOTSTRAP := 1 644 645# Allows finding `.clippy.toml` in out-of-srctree builds. 646export CLIPPY_CONF_DIR := $(srctree) 647 648export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 649export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 650export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 651export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 652export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 653export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 654export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 655export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 656 657export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 658export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 659export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 660export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 661export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 662export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 663 664# Files to ignore in find ... statements 665 666export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 667 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 668 -prune -o 669 670# =========================================================================== 671# Rules shared between *config targets and build targets 672 673# Basic helpers built in scripts/basic/ 674PHONY += scripts_basic 675scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 676scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 677scripts_basic: 678 $(Q)$(MAKE) $(build)=scripts/basic 679 680PHONY += outputmakefile 681ifdef building_out_of_srctree 682# Before starting out-of-tree build, make sure the source tree is clean. 683# outputmakefile generates a Makefile in the output directory, if using a 684# separate output directory. This allows convenient use of make in the 685# output directory. 686# At the same time when output Makefile generated, generate .gitignore to 687# ignore whole output directory 688 689ifdef KBUILD_EXTMOD 690print_env_for_makefile = \ 691 echo "export KBUILD_OUTPUT = $(objtree)"; \ 692 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 693 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 694else 695print_env_for_makefile = \ 696 echo "export KBUILD_OUTPUT = $(CURDIR)" 697endif 698 699filechk_makefile = { \ 700 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 701 $(print_env_for_makefile); \ 702 echo "include $(abs_srctree)/Makefile"; \ 703 } 704 705PHONY += $(CURDIR)/Makefile 706$(CURDIR)/Makefile: FORCE 707 $(call filechk,makefile) 708 709outputmakefile: $(CURDIR)/Makefile 710ifeq ($(KBUILD_EXTMOD),) 711 @if [ -f $(srctree)/.config -o \ 712 -d $(srctree)/include/config -o \ 713 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 714 echo >&2 "***"; \ 715 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 716 echo >&2 "*** in $(abs_srctree)";\ 717 echo >&2 "***"; \ 718 false; \ 719 fi 720else 721 @if [ -f $(srcroot)/modules.order ]; then \ 722 echo >&2 "***"; \ 723 echo >&2 "*** The external module source tree is not clean."; \ 724 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 725 echo >&2 "***"; \ 726 false; \ 727 fi 728endif 729 $(Q)ln -fsn $(srcroot) source 730 $(Q)test -e .gitignore || \ 731 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 732endif 733 734# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 735# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 736# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 737# Kconfig (so they need export), and from include/config/auto.conf.cmd to 738# detect the version changes between builds. 739CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 740RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 741PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 742 743ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 744include $(srctree)/scripts/Makefile.clang 745endif 746 747# Include this also for config targets because some architectures need 748# cc-cross-prefix to determine CROSS_COMPILE. 749ifdef need-compiler 750include $(srctree)/scripts/Makefile.compiler 751endif 752 753ifdef config-build 754# =========================================================================== 755# *config targets only - make sure prerequisites are updated, and descend 756# in scripts/kconfig to make the *config target 757 758# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 759# KBUILD_DEFCONFIG may point out an alternative default configuration 760# used for 'make defconfig' 761include $(srctree)/arch/$(SRCARCH)/Makefile 762export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 763 764config: outputmakefile scripts_basic FORCE 765 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 766 767%config: outputmakefile scripts_basic FORCE 768 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 769 770else #!config-build 771# =========================================================================== 772# Build targets only - this includes vmlinux, arch-specific targets, clean 773# targets and others. In general all targets except *config targets. 774 775# If building an external module we do not care about the all: rule 776# but instead __all depend on modules 777PHONY += all 778ifeq ($(KBUILD_EXTMOD),) 779__all: all 780else 781__all: modules 782endif 783 784targets := 785 786# Decide whether to build built-in, modular, or both. 787# Normally, just do built-in. 788 789KBUILD_MODULES := 790KBUILD_BUILTIN := y 791 792# If we have only "make modules", don't compile built-in objects. 793ifeq ($(MAKECMDGOALS),modules) 794 KBUILD_BUILTIN := 795endif 796 797# If we have "make <whatever> modules", compile modules 798# in addition to whatever we do anyway. 799# Just "make" or "make all" shall build modules as well 800 801ifneq ($(filter all modules nsdeps compile_commands.json clang-% sbom,$(MAKECMDGOALS)),) 802 KBUILD_MODULES := y 803endif 804 805ifeq ($(MAKECMDGOALS),) 806 KBUILD_MODULES := y 807endif 808 809export KBUILD_MODULES KBUILD_BUILTIN 810 811ifdef need-config 812include $(objtree)/include/config/auto.conf 813endif 814 815CC_FLAGS_DIALECT := -std=gnu11 816# Allow including a tagged struct or union anonymously in another struct/union. 817CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 818# Clang enables warnings about GNU and Microsoft extensions by default, disable 819# them because this is expected with the above options. 820ifdef CONFIG_CC_IS_CLANG 821CC_FLAGS_DIALECT += -Wno-gnu 822CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 823endif 824export CC_FLAGS_DIALECT 825KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 826 827ifeq ($(KBUILD_EXTMOD),) 828# Objects we will link into vmlinux / subdirs we need to visit 829core-y := 830drivers-y := 831libs-y := lib/ 832endif # KBUILD_EXTMOD 833 834# The all: target is the default when no target is given on the 835# command line. 836# This allow a user to issue only 'make' to build a kernel including modules 837# Defaults to vmlinux, but the arch makefile usually adds further targets 838all: vmlinux 839 840# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 841ifdef CONFIG_FUNCTION_TRACER 842 CC_FLAGS_FTRACE := -pg 843endif 844 845ifdef CONFIG_TRACEPOINTS 846# To check for unused tracepoints (tracepoints that are defined but never 847# called), run with: 848# 849# make UT=1 850# 851# Each unused tracepoints can take up to 5KB of memory in the running kernel. 852# It is best to remove any that are not used. 853# 854# This command line option will be removed when all current unused 855# tracepoints are removed. 856 857ifeq ("$(origin UT)", "command line") 858 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 859endif 860endif # CONFIG_TRACEPOINTS 861 862export WARN_ON_UNUSED_TRACEPOINTS 863 864# Per-version Rust flags. These are like `rust_common_flags`, but may 865# depend on the Rust compiler version (e.g. using `rustc-min-version`). 866# 867# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 868# include bitmasking and shift operations. However, because it generated 869# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 870# lint which is not enabled by default. 871rust_common_flags_per_version := \ 872 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 873 874rust_common_flags += $(rust_common_flags_per_version) 875KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 876KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 877 878include $(srctree)/arch/$(SRCARCH)/Makefile 879 880ifdef need-config 881ifdef may-sync-config 882# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 883# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 884# because some architectures define CROSS_COMPILE there. 885include include/config/auto.conf.cmd 886 887$(KCONFIG_CONFIG): 888 @echo >&2 '***' 889 @echo >&2 '*** Configuration file "$@" not found!' 890 @echo >&2 '***' 891 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 892 @echo >&2 '*** "make menuconfig" or "make xconfig").' 893 @echo >&2 '***' 894 @/bin/false 895 896# The actual configuration files used during the build are stored in 897# include/generated/ and include/config/. Update them if .config is newer than 898# include/config/auto.conf (which mirrors .config). 899# 900# This exploits the 'multi-target pattern rule' trick. 901# The syncconfig should be executed only once to make all the targets. 902# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 903# 904# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 905# so you cannot notice that Kconfig is waiting for the user input. 906%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 907 $(Q)$(kecho) " SYNC $@" 908 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 909else # !may-sync-config 910# External modules and some install targets need include/generated/autoconf.h 911# and include/config/auto.conf but do not care if they are up-to-date. 912# Use auto.conf to show the error message 913 914checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 915missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 916 917ifdef missing-configs 918PHONY += $(objtree)/include/config/auto.conf 919 920$(objtree)/include/config/auto.conf: 921 @echo >&2 '***' 922 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 923 @printf >&2 '*** - %s\n' $(missing-configs) 924 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 925 @echo >&2 '***' 926 @/bin/false 927endif 928 929endif # may-sync-config 930endif # need-config 931 932KBUILD_CFLAGS += -fno-delete-null-pointer-checks 933 934ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 935KBUILD_CFLAGS += -O2 936KBUILD_RUSTFLAGS += -Copt-level=2 937else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 938KBUILD_CFLAGS += -Os 939KBUILD_RUSTFLAGS += -Copt-level=s 940endif 941 942# Always set `debug-assertions` and `overflow-checks` because their default 943# depends on `opt-level` and `debug-assertions`, respectively. 944KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 945KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 946 947# Tell gcc to never replace conditional load with a non-conditional one 948ifdef CONFIG_CC_IS_GCC 949# gcc-10 renamed --param=allow-store-data-races=0 to 950# -fno-allow-store-data-races. 951KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 952KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 953endif 954 955ifdef CONFIG_READABLE_ASM 956# Disable optimizations that make assembler listings hard to read. 957# reorder blocks reorders the control in the function 958# ipa clone creates specialized cloned functions 959# partial inlining inlines only parts of functions 960KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 961endif 962 963stackp-flags-y := -fno-stack-protector 964stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 965stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 966 967KBUILD_CFLAGS += $(stackp-flags-y) 968 969ifdef CONFIG_FRAME_POINTER 970KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 971KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 972# Work around rustc bug on compilers without 973# https://github.com/rust-lang/rust/pull/156980. 974KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=frame-pointer:u32:2:max) 975else 976# Some targets (ARM with Thumb2, for example), can't be built with frame 977# pointers. For those, we don't have FUNCTION_TRACER automatically 978# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 979# incompatible with -fomit-frame-pointer with current GCC, so we don't use 980# -fomit-frame-pointer with FUNCTION_TRACER. 981# In the Rust target specification, "frame-pointer" is set explicitly 982# to "may-omit". 983ifndef CONFIG_FUNCTION_TRACER 984KBUILD_CFLAGS += -fomit-frame-pointer 985endif 986endif 987 988# Initialize all stack variables with a 0xAA pattern. 989ifdef CONFIG_INIT_STACK_ALL_PATTERN 990KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 991endif 992 993# Initialize all stack variables with a zero value. 994ifdef CONFIG_INIT_STACK_ALL_ZERO 995KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 996ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 997# https://github.com/llvm/llvm-project/issues/44842 998CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 999export CC_AUTO_VAR_INIT_ZERO_ENABLER 1000KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 1001endif 1002endif 1003 1004ifdef CONFIG_KMALLOC_PARTITION_TYPED 1005# KMALLOC_PARTITION_CACHES_NR + 1 1006KBUILD_CFLAGS += -falloc-token-max=16 1007endif 1008 1009ifdef CONFIG_CC_IS_CLANG 1010ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1011KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1012endif 1013endif 1014 1015# Explicitly clear padding bits during variable initialization 1016KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1017 1018# While VLAs have been removed, GCC produces unreachable stack probes 1019# for the randomize_kstack_offset feature. Disable it for all compilers. 1020KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1021 1022# Get details on warnings generated due to GCC value tracking. 1023KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1024 1025# Show inlining notes for __attribute__((warning/error)) call chains. 1026# GCC supports this unconditionally while Clang 23+ provides a flag. 1027KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1028 1029# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1030ifdef CONFIG_ZERO_CALL_USED_REGS 1031KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1032endif 1033 1034ifdef CONFIG_FUNCTION_TRACER 1035ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1036 CC_FLAGS_FTRACE += -mrecord-mcount 1037 ifdef CONFIG_HAVE_NOP_MCOUNT 1038 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1039 CC_FLAGS_FTRACE += -mnop-mcount 1040 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1041 endif 1042 endif 1043endif 1044ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1045 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1046 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1047 endif 1048endif 1049ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1050 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1051 BUILD_C_RECORDMCOUNT := y 1052 export BUILD_C_RECORDMCOUNT 1053 endif 1054endif 1055ifdef CONFIG_HAVE_FENTRY 1056 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1057 ifeq ($(call cc-option-yn, -mfentry),y) 1058 CC_FLAGS_FTRACE += -mfentry 1059 CC_FLAGS_USING += -DCC_USING_FENTRY 1060 endif 1061endif 1062export CC_FLAGS_FTRACE 1063KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1064KBUILD_AFLAGS += $(CC_FLAGS_USING) 1065endif 1066 1067# We trigger additional mismatches with less inlining 1068ifdef CONFIG_DEBUG_SECTION_MISMATCH 1069KBUILD_CFLAGS += -fno-inline-functions-called-once 1070endif 1071 1072# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1073ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1074KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1075KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1076LDFLAGS_vmlinux += --gc-sections 1077endif 1078 1079ifdef CONFIG_SHADOW_CALL_STACK 1080ifndef CONFIG_DYNAMIC_SCS 1081CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1082KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1083KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1084endif 1085export CC_FLAGS_SCS 1086endif 1087 1088ifdef CONFIG_RUST_INLINE_HELPERS 1089# `rustc` normally emits traps for unreachable paths during code generation. 1090# With inline helpers, Clang performs code generation from the linked bitcode 1091# instead, so request the same behavior explicitly. Otherwise `objtool` may 1092# follow an impossible Rust path into the next function. 1093CC_FLAGS_RUST_INLINE_HELPERS := -mllvm -trap-unreachable \ 1094 -mllvm -no-trap-after-noreturn 1095export CC_FLAGS_RUST_INLINE_HELPERS 1096endif 1097 1098ifdef CONFIG_LTO_CLANG 1099ifdef CONFIG_LTO_CLANG_FULL 1100CC_FLAGS_LTO := -flto 1101else 1102CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1103 1104# These LLVM options were initially added with only in-process ThinLTO 1105# support, so avoid distributed ThinLTO support for now. 1106ifdef CONFIG_LTO_CLANG_THIN 1107KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1108endif 1109endif 1110CC_FLAGS_LTO += -fvisibility=hidden 1111 1112# Limit inlining across translation units to reduce binary size 1113KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1114endif 1115 1116ifdef CONFIG_LTO 1117KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1118KBUILD_AFLAGS += -fno-lto 1119export CC_FLAGS_LTO 1120endif 1121 1122ifdef CONFIG_CFI 1123CC_FLAGS_CFI := -fsanitize=kcfi 1124ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1125 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1126endif 1127ifdef CONFIG_FINEIBT_BHI 1128 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1129endif 1130ifdef CONFIG_RUST 1131 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1132 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1133 # Disable function merging as LLVM incorrectly merges functions with different KCFI types. 1134 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers -Zmerge-functions=disabled 1135 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1136 export RUSTC_FLAGS_CFI 1137endif 1138KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1139export CC_FLAGS_CFI 1140endif 1141 1142# Architectures can define flags to add/remove for floating-point support 1143CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1144export CC_FLAGS_FPU 1145export CC_FLAGS_NO_FPU 1146 1147ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1148# Set the minimal function alignment. Use the newer GCC option 1149# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1150# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1151ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1152KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1153else 1154KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1155endif 1156endif 1157 1158# arch Makefile may override CC so keep this after arch Makefile is included 1159NOSTDINC_FLAGS += -nostdinc 1160 1161# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1162# the kernel uses only C99 flexible arrays for dynamically sized trailing 1163# arrays. Enforce this for everything that may examine structure sizes and 1164# perform bounds checking. 1165KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1166 1167# disable invalid "can't wrap" optimizations for signed / pointers 1168KBUILD_CFLAGS += -fno-strict-overflow 1169 1170# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1171KBUILD_CFLAGS += -fno-stack-check 1172 1173# conserve stack if available 1174ifdef CONFIG_CC_IS_GCC 1175KBUILD_CFLAGS += -fconserve-stack 1176endif 1177 1178# Ensure compilers do not transform certain loops into calls to wcslen() 1179KBUILD_CFLAGS += -fno-builtin-wcslen 1180 1181CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1182ifdef CONFIG_CC_IS_GCC 1183CFLAGS_GCOV += -fno-tree-loop-im 1184# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1185# Only enable if -fprofile-update=prefer-atomic does not introduce new 1186# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1187CFLAGS_GCOV += $(call try-run,\ 1188 echo 'long long x; void f(void){x++;}' | \ 1189 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1190 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1191 echo 'long long x; void f(void){x++;}' | \ 1192 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1193 -ftest-coverage -fprofile-update=prefer-atomic \ 1194 -x c - -c -o "$$TMP" && \ 1195 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1196 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1197 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1198 -fprofile-update=prefer-atomic) 1199endif 1200export CFLAGS_GCOV 1201 1202# change __FILE__ to the relative path to the source directory 1203ifdef building_out_of_srctree 1204KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1205ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1206KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1207endif 1208endif 1209 1210# include additional Makefiles when needed 1211include-y := scripts/Makefile.warn 1212include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1213include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1214include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1215include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1216include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1217include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1218include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1219include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1220include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1221include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1222include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1223include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1224include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1225 1226include $(addprefix $(srctree)/, $(include-y)) 1227 1228# scripts/Makefile.gcc-plugins is intentionally included last. 1229# Do not add $(call cc-option,...) below this line. When you build the kernel 1230# from the clean source tree, the GCC plugins do not exist at this point. 1231 1232# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1233KBUILD_CPPFLAGS += $(KCPPFLAGS) 1234KBUILD_AFLAGS += $(KAFLAGS) 1235KBUILD_CFLAGS += $(KCFLAGS) 1236KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1237 1238KBUILD_LDFLAGS_MODULE += --build-id=sha1 1239LDFLAGS_vmlinux += --build-id=sha1 1240 1241# Specific code, such as outlined KASAN checks, may be placed in 1242# COMDAT-deduplicated sections. Use --force-group-allocation to resolve these 1243# groups when linking modules. The option is available from ld.bfd 2.29 and 1244# ld.lld 19.1.0. 1245KBUILD_LDFLAGS_MODULE += $(call ld-option,--force-group-allocation) 1246 1247KBUILD_LDFLAGS += -z noexecstack 1248ifeq ($(CONFIG_LD_IS_BFD),y) 1249KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1250endif 1251 1252ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1253LDFLAGS_vmlinux += -X 1254endif 1255 1256ifeq ($(CONFIG_RELR),y) 1257# ld.lld before 15 did not support -z pack-relative-relocs. 1258LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1259endif 1260 1261# We never want expected sections to be placed heuristically by the 1262# linker. All sections should be explicitly named in the linker script. 1263ifdef CONFIG_LD_ORPHAN_WARN 1264LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1265endif 1266 1267ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1268LDFLAGS_vmlinux += --emit-relocs --discard-none 1269endif 1270 1271# Align the architecture of userspace programs with the kernel 1272USERFLAGS_FROM_KERNEL := --target=% 1273 1274ifdef CONFIG_ARCH_USERFLAGS 1275KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1276KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1277else 1278# If not overridden also inherit the bit size 1279USERFLAGS_FROM_KERNEL += -m32 -m64 1280endif 1281 1282KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1283KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1284 1285# userspace programs are linked via the compiler, use the correct linker 1286ifdef CONFIG_CC_IS_CLANG 1287KBUILD_USERLDFLAGS += --ld-path=$(LD) 1288endif 1289 1290# make the checker run with the right architecture 1291CHECKFLAGS += --arch=$(ARCH) 1292 1293# insure the checker run with the right endianness 1294CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1295 1296# the checker needs the correct machine size 1297CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1298 1299# Validate the checker is available and functional 1300ifneq ($(KBUILD_CHECKSRC), 0) 1301 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1302 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1303 KBUILD_CHECKSRC = 0 1304 endif 1305endif 1306 1307# Default kernel image to build when no specific target is given. 1308# KBUILD_IMAGE may be overruled on the command line or 1309# set in the environment 1310# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1311# this default value 1312export KBUILD_IMAGE ?= vmlinux 1313 1314# 1315# INSTALL_PATH specifies where to place the updated kernel and system map 1316# images. Default is /boot, but you can set it to other values 1317export INSTALL_PATH ?= /boot 1318 1319# 1320# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1321# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1322# an argument if needed. Otherwise it defaults to the kernel install path 1323# 1324export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1325 1326# 1327# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1328# relocations required by build roots. This is not defined in the 1329# makefile but the argument can be passed to make if needed. 1330# 1331 1332MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1333export MODLIB 1334 1335PHONY += prepare0 1336 1337ifeq ($(KBUILD_EXTMOD),) 1338 1339build-dir := . 1340clean-dirs := $(sort . Documentation \ 1341 $(patsubst %/,%,$(filter %/, $(core-) \ 1342 $(drivers-) $(libs-)))) 1343 1344export ARCH_CORE := $(core-y) 1345export ARCH_LIB := $(filter %/, $(libs-y)) 1346export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1347# Externally visible symbols (used by link-vmlinux.sh) 1348 1349KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1350KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1351 1352export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1353export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1354 1355ifdef CONFIG_TRIM_UNUSED_KSYMS 1356# For the kernel to actually contain only the needed exported symbols, 1357# we have to build modules as well to determine what those symbols are. 1358KBUILD_MODULES := y 1359endif 1360 1361PHONY += vmlinux_a 1362vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1363 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1364 1365vmlinux.a: vmlinux_a 1366 @: 1367 1368PHONY += vmlinux_o 1369vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1370 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1371 1372vmlinux.o: vmlinux_o 1373 @: 1374 1375PHONY += vmlinux 1376# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1377# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1378# unrelated; the decompressors just happen to have the same base name, 1379# arch/*/boot/compressed/vmlinux. 1380# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1381# 1382# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1383# https://savannah.gnu.org/bugs/?61463 1384# For Make > 4.4, the following simple code will work: 1385# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1386vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1387vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1388vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1389 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1390 1391# The actual objects are generated when descending, 1392# make sure no implicit rule kicks in 1393$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1394 1395ifeq ($(origin KERNELRELEASE),file) 1396filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1397else 1398filechk_kernel.release = echo $(KERNELRELEASE) 1399endif 1400 1401# Store (new) KERNELRELEASE string in include/config/kernel.release 1402include/config/kernel.release: FORCE 1403 $(call filechk,kernel.release) 1404 1405# Additional helpers built in scripts/ 1406# Carefully list dependencies so we do not try to build scripts twice 1407# in parallel 1408PHONY += scripts 1409scripts: scripts_basic scripts_dtc 1410 $(Q)$(MAKE) $(build)=$(@) 1411 1412# Things we need to do before we recursively start building the kernel 1413# or the modules are listed in "prepare". 1414# A multi level approach is used. prepareN is processed before prepareN-1. 1415# archprepare is used in arch Makefiles and when processed asm symlink, 1416# version.h and scripts_basic is processed / created. 1417 1418PHONY += prepare archprepare 1419 1420archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1421 asm-generic $(version_h) include/generated/utsrelease.h \ 1422 include/generated/compile.h include/generated/autoconf.h \ 1423 include/generated/rustc_cfg remove-stale-files 1424 1425prepare0: archprepare 1426 $(Q)$(MAKE) $(build)=scripts/mod 1427 $(Q)$(MAKE) $(build)=. prepare 1428 1429# All the preparing.. 1430prepare: prepare0 1431ifdef CONFIG_RUST 1432 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1433 $(Q)$(MAKE) $(build)=rust 1434endif 1435 1436PHONY += remove-stale-files 1437remove-stale-files: 1438 $(Q)$(srctree)/scripts/remove-stale-files 1439 1440# Support for using generic headers in asm-generic 1441asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1442 1443PHONY += asm-generic uapi-asm-generic 1444asm-generic: uapi-asm-generic 1445 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1446 generic=include/asm-generic 1447uapi-asm-generic: 1448 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1449 generic=include/uapi/asm-generic 1450 1451# Generate some files 1452# --------------------------------------------------------------------------- 1453 1454# KERNELRELEASE can change from a few different places, meaning version.h 1455# needs to be updated, so this check is forced on all builds 1456 1457uts_len := 64 1458define filechk_utsrelease.h 1459 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1460 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1461 exit 1; \ 1462 fi; \ 1463 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1464endef 1465 1466define filechk_version.h 1467 if [ $(SUBLEVEL) -gt 255 ]; then \ 1468 echo \#define LINUX_VERSION_CODE $(shell \ 1469 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1470 else \ 1471 echo \#define LINUX_VERSION_CODE $(shell \ 1472 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1473 fi; \ 1474 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1475 ((c) > 255 ? 255 : (c)))'; \ 1476 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1477 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1478 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1479endef 1480 1481$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1482$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1483$(version_h): FORCE 1484 $(call filechk,version.h) 1485 1486include/generated/utsrelease.h: include/config/kernel.release FORCE 1487 $(call filechk,utsrelease.h) 1488 1489filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1490 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1491 1492include/generated/compile.h: FORCE 1493 $(call filechk,compile.h) 1494 1495PHONY += headerdep 1496headerdep: 1497 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1498 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1499 1500# --------------------------------------------------------------------------- 1501# Kernel headers 1502 1503#Default location for installed headers 1504export INSTALL_HDR_PATH = $(objtree)/usr 1505 1506quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1507 cmd_headers_install = \ 1508 mkdir -p $(INSTALL_HDR_PATH); \ 1509 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1510 usr/include $(INSTALL_HDR_PATH) 1511 1512PHONY += headers_install 1513headers_install: headers 1514 $(call cmd,headers_install) 1515 1516PHONY += archheaders archscripts 1517 1518hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1519 1520PHONY += headers 1521headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1522ifdef HEADER_ARCH 1523 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1524else 1525 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1526 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1527endif 1528 1529ifdef CONFIG_HEADERS_INSTALL 1530prepare: headers 1531endif 1532 1533PHONY += usr_gen_init_cpio 1534usr_gen_init_cpio: scripts_basic 1535 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1536 1537PHONY += scripts_unifdef 1538scripts_unifdef: scripts_basic 1539 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1540 1541PHONY += scripts_gen_packed_field_checks 1542scripts_gen_packed_field_checks: scripts_basic 1543 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1544 1545# --------------------------------------------------------------------------- 1546# Install 1547 1548# Many distributions have the custom install script, /sbin/installkernel. 1549# If DKMS is installed, 'make install' will eventually recurse back 1550# to this Makefile to build and install external modules. 1551# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1552 1553quiet_cmd_install = INSTALL $(INSTALL_PATH) 1554 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1555 1556# --------------------------------------------------------------------------- 1557# vDSO install 1558 1559PHONY += vdso_install 1560vdso_install: export INSTALL_FILES = $(vdso-install-y) 1561vdso_install: 1562 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1563 1564# --------------------------------------------------------------------------- 1565# Tools 1566 1567ifdef CONFIG_OBJTOOL 1568prepare: tools/objtool 1569endif 1570 1571ifdef CONFIG_BPF 1572ifdef CONFIG_DEBUG_INFO_BTF 1573prepare: tools/bpf/resolve_btfids 1574endif 1575endif 1576 1577# tools/bootconfig renders the embedded bootconfig into a cmdline at build time. 1578ifdef CONFIG_CMDLINE_FROM_BOOTCONFIG 1579prepare: tools/bootconfig 1580endif 1581 1582# tools/bootconfig is run on the build host during prepare, so force a host 1583# binary here; its own Makefile keeps $(CC) for standalone and cross builds. 1584# CROSS_COMPILE= is cleared so tools/scripts/Makefile.include does not inject 1585# the target's --target=/--sysroot= flags into the host clang invocation under 1586# LLVM=1 cross builds (which would produce a target binary that fails to exec). 1587tools/bootconfig: export CC := $(HOSTCC) 1588tools/bootconfig: FORCE 1589 $(Q)mkdir -p $(objtree)/tools 1590 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ \ 1591 bootconfig CROSS_COMPILE= 1592 1593# The tools build system is not a part of Kbuild and tends to introduce 1594# its own unique issues. If you need to integrate a new tool into Kbuild, 1595# please consider locating that tool outside the tools/ tree and using the 1596# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1597# here. See Documentation/kbuild/makefiles.rst for details. 1598 1599PHONY += resolve_btfids_clean 1600 1601resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1602 1603# tools/bpf/resolve_btfids directory might not exist 1604# in output directory, skip its clean in that case 1605resolve_btfids_clean: 1606ifneq ($(wildcard $(resolve_btfids_O)),) 1607 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1608endif 1609 1610PHONY += objtool_clean objtool_mrproper 1611 1612objtool_O = $(abspath $(objtree))/tools/objtool 1613 1614objtool_clean objtool_mrproper: 1615ifneq ($(wildcard $(objtool_O)),) 1616 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1617endif 1618 1619PHONY += bootconfig_clean 1620 1621bootconfig_O = $(abspath $(objtree))/tools/bootconfig 1622 1623bootconfig_clean: 1624ifneq ($(wildcard $(bootconfig_O)),) 1625 $(Q)$(MAKE) -sC $(srctree)/tools/bootconfig O=$(bootconfig_O) clean 1626endif 1627 1628tools/: FORCE 1629 $(Q)mkdir -p $(objtree)/tools 1630 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1631 1632tools/%: FORCE 1633 $(Q)mkdir -p $(objtree)/tools 1634 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1635 1636# --------------------------------------------------------------------------- 1637# Kernel selftest 1638 1639PHONY += kselftest 1640kselftest: headers 1641 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1642 1643kselftest-%: headers FORCE 1644 $(Q)unset sub_make_done; $(MAKE) -C $(srctree)/tools/testing/selftests $* 1645 1646PHONY += kselftest-merge 1647kselftest-merge: 1648 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1649 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1650 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1651 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1652 1653# --------------------------------------------------------------------------- 1654# Devicetree files 1655 1656ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1657dtstree := arch/$(SRCARCH)/boot/dts 1658endif 1659 1660dtbindingtree := Documentation/devicetree/bindings 1661 1662%.yaml: dtbs_prepare 1663 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1664 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1665 1666ifneq ($(dtstree),) 1667 1668%.dtb: dtbs_prepare 1669 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1670 1671%.dtbo: dtbs_prepare 1672 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1673 1674PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1675dtbs: dtbs_prepare 1676 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1677 1678# include/config/kernel.release is actually needed when installing DTBs because 1679# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1680# dtbs_install depend on it as dtbs_install may run as root. 1681dtbs_prepare: include/config/kernel.release scripts_dtc 1682 1683ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1684export CHECK_DTBS=y 1685endif 1686 1687ifneq ($(CHECK_DTBS),) 1688dtbs_prepare: dt_binding_schemas 1689endif 1690 1691dtbs_check: dtbs 1692 1693dtbs_install: 1694 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1695 1696ifdef CONFIG_OF_EARLY_FLATTREE 1697all: dtbs 1698endif 1699 1700ifdef CONFIG_GENERIC_BUILTIN_DTB 1701vmlinux: dtbs 1702endif 1703 1704endif 1705 1706PHONY += scripts_dtc 1707scripts_dtc: scripts_basic 1708 $(Q)$(MAKE) $(build)=scripts/dtc 1709 1710ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1711export CHECK_DTBS=y 1712endif 1713 1714PHONY += dt_binding_check dt_binding_schemas 1715dt_binding_check: dt_binding_schemas scripts_dtc 1716 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1717 1718dt_binding_schemas: 1719 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1720 1721PHONY += dt_compatible_check 1722dt_compatible_check: dt_binding_schemas 1723 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1724 1725PHONY += dt_style_selftest 1726dt_style_selftest: 1727 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1728 1729# --------------------------------------------------------------------------- 1730# Modules 1731 1732ifdef CONFIG_MODULES 1733 1734# By default, build modules as well 1735 1736all: modules 1737 1738# When we're building modules with modversions, we need to consider 1739# the built-in objects during the descend as well, in order to 1740# make sure the checksums are up to date before we record them. 1741ifdef CONFIG_MODVERSIONS 1742 KBUILD_BUILTIN := y 1743endif 1744 1745# Build modules 1746# 1747 1748# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1749# is an exception. 1750ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1751KBUILD_BUILTIN := y 1752modules: vmlinux 1753endif 1754 1755modules: modules_prepare 1756 1757# Target to prepare building external modules 1758modules_prepare: prepare 1759 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1760 1761endif # CONFIG_MODULES 1762 1763### 1764# Cleaning is done on three levels. 1765# make clean Delete most generated files 1766# Leave enough to build external modules 1767# make mrproper Delete the current configuration, and all generated files 1768# make distclean Remove editor backup files, patch leftover files and the like 1769 1770# Directories & files removed with 'make clean' 1771CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1772 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1773 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1774 vmlinux.thinlto-index builtin.order \ 1775 compile_commands.json rust/test \ 1776 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1777 .builtin-dtbs-list .builtin-dtbs.S sbom-*.spdx.json 1778 1779# Directories & files removed with 'make mrproper' 1780MRPROPER_FILES += include/config include/generated \ 1781 arch/$(SRCARCH)/include/generated .objdiff \ 1782 debian snap tar-install PKGBUILD pacman \ 1783 .config .config.old .version \ 1784 Module.symvers \ 1785 certs/signing_key.pem \ 1786 certs/x509.genkey \ 1787 vmlinux-gdb.py \ 1788 rpmbuild \ 1789 rust/libmacros.so rust/libmacros.dylib \ 1790 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1791 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1792 1793# clean - Delete most, but leave enough to build external modules 1794# 1795clean: private rm-files := $(CLEAN_FILES) 1796 1797PHONY += archclean vmlinuxclean 1798 1799vmlinuxclean: 1800 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1801 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1802 1803clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean bootconfig_clean 1804 1805# mrproper - Delete all generated files, including .config 1806# 1807mrproper: private rm-files := $(MRPROPER_FILES) 1808mrproper-dirs := $(addprefix _mrproper_,scripts) 1809 1810PHONY += $(mrproper-dirs) mrproper 1811$(mrproper-dirs): 1812 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1813 1814mrproper: clean objtool_mrproper $(mrproper-dirs) 1815 $(call cmd,rmfiles) 1816 @find . $(RCS_FIND_IGNORE) \ 1817 \( -name '*.rmeta' \) \ 1818 -type f -print | xargs rm -f 1819 1820# distclean 1821# 1822PHONY += distclean 1823 1824distclean: mrproper 1825 @find . $(RCS_FIND_IGNORE) \ 1826 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1827 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1828 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1829 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1830 -type f -print | xargs rm -f 1831 1832 1833# Packaging of the kernel to various formats 1834# --------------------------------------------------------------------------- 1835 1836modules-cpio-pkg: usr_gen_init_cpio 1837 1838%src-pkg: FORCE 1839 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1840%pkg: include/config/kernel.release FORCE 1841 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1842 1843# Brief documentation of the typical targets used 1844# --------------------------------------------------------------------------- 1845 1846boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1847boards := $(sort $(notdir $(boards))) 1848board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1849board-dirs := $(sort $(notdir $(board-dirs:/=))) 1850 1851PHONY += help 1852help: 1853 @echo 'Cleaning targets:' 1854 @echo ' clean - Remove most generated files but keep the config and' 1855 @echo ' enough build support to build external modules' 1856 @echo ' mrproper - Remove all generated files + config + various backup files' 1857 @echo ' distclean - mrproper + remove editor backup and patch files' 1858 @echo '' 1859 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1860 @echo '' 1861 @echo 'Other generic targets:' 1862 @echo ' all - Build all targets marked with [*]' 1863 @echo '* vmlinux - Build the bare kernel' 1864 @echo '* modules - Build all modules' 1865 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1866 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1867 @echo ' dir/ - Build all files in dir and below' 1868 @echo ' dir/file.[ois] - Build specified target only' 1869 @echo ' dir/file.ll - Build the LLVM assembly file' 1870 @echo ' (requires compiler support for LLVM assembly generation)' 1871 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1872 @echo ' (requires a recent binutils and recent build (System.map))' 1873 @echo ' dir/file.ko - Build module including final link' 1874 @echo ' modules_prepare - Set up for building external modules' 1875 @echo ' tags/TAGS - Generate tags file for editors' 1876 @echo ' cscope - Generate cscope index' 1877 @echo ' gtags - Generate GNU GLOBAL index' 1878 @echo ' kernelrelease - Output the release version string (use with make -s)' 1879 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1880 @echo ' image_name - Output the image name (use with make -s)' 1881 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1882 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1883 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1884 echo '' 1885 @echo 'Static analysers:' 1886 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1887 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1888 @echo ' versioncheck - Sanity check on version.h usage' 1889 @echo ' includecheck - Check for duplicate included header files' 1890 @echo ' headerdep - Detect inclusion cycles in headers' 1891 @echo ' coccicheck - Check with Coccinelle' 1892 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1893 @echo ' clang-analyzer - Check with clang static analyzer' 1894 @echo ' clang-tidy - Check with clang-tidy' 1895 @echo '' 1896 @echo 'Tools:' 1897 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1898 @echo ' sbom - Generate Software Bill of Materials' 1899 @echo '' 1900 @echo 'Kernel selftest:' 1901 @echo ' kselftest - Build and run kernel selftest' 1902 @echo ' Build, install, and boot kernel before' 1903 @echo ' running kselftest on it' 1904 @echo ' Run as root for full coverage' 1905 @echo ' kselftest-all - Build kernel selftest' 1906 @echo ' kselftest-install - Build and install kernel selftest' 1907 @echo ' kselftest-clean - Remove all generated kselftest files' 1908 @echo ' kselftest-merge - Merge all the config dependencies of' 1909 @echo ' kselftest to existing .config.' 1910 @echo '' 1911 @echo 'Rust targets:' 1912 @echo ' rustavailable - Checks whether the Rust toolchain is' 1913 @echo ' available and, if not, explains why.' 1914 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1915 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1916 @echo ' is formatted, printing a diff otherwise.' 1917 @echo ' rustdoc - Generate Rust documentation' 1918 @echo ' (requires kernel .config)' 1919 @echo ' rusttest - Runs the Rust tests' 1920 @echo ' (requires kernel .config; downloads external repos)' 1921 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1922 @echo ' (requires kernel .config)' 1923 @echo ' dir/file.[os] - Build specified target only' 1924 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1925 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1926 @echo ' The output is not intended to be compilable.' 1927 @echo ' dir/file.ll - Build the LLVM assembly file' 1928 @echo '' 1929 @$(if $(dtstree), \ 1930 echo 'Devicetree:'; \ 1931 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1932 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1933 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1934 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1935 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1936 echo ' dtbs_check - Validate device tree source files';\ 1937 echo '') 1938 1939 @echo 'Userspace tools targets:' 1940 @echo ' use "make tools/help"' 1941 @echo ' or "cd tools; make help"' 1942 @echo '' 1943 @echo 'Kernel packaging:' 1944 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1945 @echo '' 1946 @echo 'Documentation targets:' 1947 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1948 @echo '' 1949 @echo 'Architecture-specific targets ($(SRCARCH)):' 1950 @$(or $(archhelp),\ 1951 echo ' No architecture-specific help defined for $(SRCARCH)') 1952 @echo '' 1953 @$(if $(boards), \ 1954 $(foreach b, $(boards), \ 1955 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1956 echo '') 1957 @$(if $(board-dirs), \ 1958 $(foreach b, $(board-dirs), \ 1959 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1960 printf " %-16s - Show all of the above\\n" help-boards; \ 1961 echo '') 1962 1963 @echo ' make V=n [targets] 1: verbose build' 1964 @echo ' 2: give reason for rebuild of target' 1965 @echo ' V=1 and V=2 can be combined with V=12' 1966 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1967 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1968 @echo ' (sparse by default)' 1969 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1970 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1971 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1972 @echo ' 1: warnings which may be relevant and do not occur too often' 1973 @echo ' 2: warnings which occur quite often but may still be relevant' 1974 @echo ' 3: more obscure warnings, can most likely be ignored' 1975 @echo ' c: extra checks in the configuration stage (Kconfig)' 1976 @echo ' e: warnings are being treated as errors' 1977 @echo ' Multiple levels can be combined with W=12 or W=123' 1978 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1979 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1980 @$(if $(dtstree), \ 1981 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1982 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1983 ) 1984 @echo '' 1985 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1986 @echo 'For further info see the ./README file' 1987 1988 1989help-board-dirs := $(addprefix help-,$(board-dirs)) 1990 1991help-boards: $(help-board-dirs) 1992 1993boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1994 1995$(help-board-dirs): help-%: 1996 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1997 @$(if $(boards-per-dir), \ 1998 $(foreach b, $(boards-per-dir), \ 1999 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 2000 echo '') 2001 2002 2003# Documentation targets 2004# --------------------------------------------------------------------------- 2005DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 2006 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 2007 htmldocs-redirects testdocs 2008 2009PHONY += $(DOC_TARGETS) 2010$(DOC_TARGETS): 2011 $(Q)$(MAKE) $(build)=Documentation $@ 2012 2013 2014# Rust targets 2015# --------------------------------------------------------------------------- 2016 2017# "Is Rust available?" target 2018PHONY += rustavailable 2019rustavailable: 2020 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 2021 2022# Documentation target 2023# 2024# Using the singular to avoid running afoul of `no-dot-config-targets`. 2025PHONY += rustdoc 2026rustdoc: prepare 2027 $(Q)$(MAKE) $(build)=rust $@ 2028 2029# Testing target 2030PHONY += rusttest 2031rusttest: prepare 2032 $(Q)$(MAKE) $(build)=rust $@ 2033 2034# Formatting targets 2035# 2036# Generated files as well as vendored crates are skipped. 2037PHONY += rustfmt rustfmtcheck 2038 2039rustfmt: 2040 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 2041 \( \ 2042 -path $(srctree)/rust/proc-macro2 \ 2043 -o -path $(srctree)/rust/quote \ 2044 -o -path $(srctree)/rust/syn \ 2045 -o -path $(srctree)/rust/zerocopy \ 2046 -o -path $(srctree)/rust/zerocopy-derive \ 2047 \) -prune -o \ 2048 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 2049 | xargs $(RUSTFMT) $(rustfmt_flags) 2050 2051rustfmtcheck: rustfmt_flags = --check 2052rustfmtcheck: rustfmt 2053 2054# Misc 2055# --------------------------------------------------------------------------- 2056 2057PHONY += misc-check 2058misc-check: 2059 $(Q)$(srctree)/scripts/misc-check 2060 2061all: misc-check 2062 2063PHONY += scripts_gdb 2064scripts_gdb: prepare0 2065 $(Q)$(MAKE) $(build)=scripts/gdb 2066 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2067 2068ifdef CONFIG_GDB_SCRIPTS 2069all: scripts_gdb 2070endif 2071 2072else # KBUILD_EXTMOD 2073 2074filechk_kernel.release = echo $(KERNELRELEASE) 2075 2076### 2077# External module support. 2078# When building external modules the kernel used as basis is considered 2079# read-only, and no consistency checks are made and the make 2080# system is not used on the basis kernel. If updates are required 2081# in the basis kernel ordinary make commands (without M=...) must be used. 2082 2083# We are always building only modules. 2084KBUILD_BUILTIN := 2085KBUILD_MODULES := y 2086 2087build-dir := . 2088 2089clean-dirs := . 2090clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2091 2092PHONY += prepare 2093# now expand this into a simple variable to reduce the cost of shell evaluations 2094prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2095prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2096prepare: 2097 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2098 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2099 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2100 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2101 fi 2102 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2103 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2104 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2105 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2106 fi 2107 2108PHONY += help 2109help: 2110 @echo ' Building external modules.' 2111 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2112 @echo '' 2113 @echo ' modules - default target, build the module(s)' 2114 @echo ' modules_install - install the module' 2115 @echo ' clean - remove generated files in module directory only' 2116 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2117 @echo '' 2118 2119ifndef CONFIG_MODULES 2120modules modules_install: __external_modules_error 2121__external_modules_error: 2122 @echo >&2 '***' 2123 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2124 @echo >&2 '*** You cannot build or install external modules.' 2125 @echo >&2 '***' 2126 @false 2127endif 2128 2129endif # KBUILD_EXTMOD 2130 2131# --------------------------------------------------------------------------- 2132# Modules 2133 2134PHONY += modules modules_install modules_sign modules_prepare 2135 2136modules_install: 2137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2138 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2139 2140ifeq ($(CONFIG_MODULE_SIG),y) 2141# modules_sign is a subset of modules_install. 2142# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2143modules_sign: modules_install 2144 @: 2145else 2146modules_sign: 2147 @echo >&2 '***' 2148 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2149 @echo >&2 '***' 2150 @false 2151endif 2152 2153ifdef CONFIG_MODULES 2154 2155modules.order: $(build-dir) 2156 @: 2157 2158# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2159# This is solely useful to speed up test compiles. 2160modules: modpost 2161ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2162 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2163endif 2164 2165PHONY += modules_check 2166modules_check: modules.order 2167 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2168 2169else # CONFIG_MODULES 2170 2171modules: 2172 @: 2173 2174KBUILD_MODULES := 2175 2176endif # CONFIG_MODULES 2177 2178PHONY += modpost 2179modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2180 $(if $(KBUILD_MODULES), modules_check) 2181 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2182 2183# Single targets 2184# --------------------------------------------------------------------------- 2185# To build individual files in subdirectories, you can do like this: 2186# 2187# make foo/bar/baz.s 2188# 2189# The supported suffixes for single-target are listed in 'single-targets' 2190# 2191# To build only under specific subdirectories, you can do like this: 2192# 2193# make foo/bar/baz/ 2194 2195ifdef single-build 2196 2197# .ko is special because modpost is needed 2198single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2199single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2200 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2201 2202$(single-ko): single_modules 2203 @: 2204$(single-no-ko): $(build-dir) 2205 @: 2206 2207# Remove modules.order when done because it is not the real one. 2208PHONY += single_modules 2209single_modules: $(single-no-ko) modules_prepare 2210 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2211 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2212ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2213 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2214endif 2215 $(Q)rm -f modules.order 2216 2217single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2218 2219KBUILD_MODULES := y 2220 2221endif 2222 2223prepare: outputmakefile 2224 2225# Preset locale variables to speed up the build process. Limit locale 2226# tweaks to this spot to avoid wrong language settings when running 2227# make menuconfig etc. 2228# Error messages still appears in the original language 2229PHONY += $(build-dir) 2230$(build-dir): prepare 2231 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2232 2233clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2234PHONY += $(clean-dirs) clean 2235$(clean-dirs): 2236 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2237 2238clean: $(clean-dirs) 2239 $(call cmd,rmfiles) 2240 @find . $(RCS_FIND_IGNORE) \ 2241 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2242 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2243 -o -name '*.dtb' -o -name '*.dtbo' \ 2244 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2245 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2246 -o -name '*.dwo' -o -name '*.lst' \ 2247 -o -name '*.su' -o -name '*.mod' \ 2248 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2249 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2250 -o -name '*.asn1.[ch]' \ 2251 -o -name '*.symtypes' -o -name 'modules.order' \ 2252 -o -name '*.c.[012]*.*' \ 2253 -o -name '*.ll' \ 2254 -o -name '*.gcno' \ 2255 -o -name '*.long-type-*.txt' \ 2256 \) -type f -print \ 2257 -o -name '.tmp_*' -print \ 2258 | xargs rm -rf 2259 2260# Generate tags for editors 2261# --------------------------------------------------------------------------- 2262quiet_cmd_tags = GEN $@ 2263 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2264 2265tags TAGS cscope gtags: FORCE 2266 $(call cmd,tags) 2267 2268# Generate rust-project.json (a file that describes the structure of non-Cargo 2269# Rust projects) for rust-analyzer (an implementation of the Language Server 2270# Protocol). 2271PHONY += rust-analyzer 2272rust-analyzer: 2273 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2274ifdef KBUILD_EXTMOD 2275# FIXME: external modules must not descend into a sub-directory of the kernel 2276 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2277else 2278 $(Q)$(MAKE) $(build)=rust $@ 2279endif 2280 2281# Script to generate missing namespace dependencies 2282# --------------------------------------------------------------------------- 2283 2284PHONY += nsdeps 2285nsdeps: export KBUILD_NSDEPS=1 2286nsdeps: modules 2287 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2288 2289# Script to generate .spdx.json SBOM documents describing the build 2290# --------------------------------------------------------------------------- 2291 2292ifdef building_out_of_srctree 2293sbom_targets := sbom-source.spdx.json 2294endif 2295sbom_targets += sbom-build.spdx.json sbom-output.spdx.json 2296quiet_cmd_sbom = GEN $(sbom_targets) 2297 cmd_sbom = printf "%s\n" "$(KBUILD_IMAGE)" >"$(tmp-target)"; \ 2298 $(if $(CONFIG_MODULES),sed 's/\.o$$/.ko/' $(objtree)/modules.order >> "$(tmp-target)";) \ 2299 $(PYTHON3) $(srctree)/scripts/sbom/sbom.py \ 2300 --src-tree $(abspath $(srctree)) \ 2301 --obj-tree $(abspath $(objtree)) \ 2302 --roots-file "$(tmp-target)" \ 2303 --output-directory $(abspath $(objtree)) \ 2304 --generate-spdx \ 2305 --package-license "GPL-2.0 WITH Linux-syscall-note" \ 2306 --package-version "$(KERNELVERSION)" \ 2307 --write-output-on-error; 2308PHONY += sbom 2309sbom: $(notdir $(KBUILD_IMAGE)) include/generated/autoconf.h $(if $(CONFIG_MODULES),modules modules.order) 2310 $(call cmd,sbom) 2311 2312# Clang Tooling 2313# --------------------------------------------------------------------------- 2314 2315quiet_cmd_gen_compile_commands = GEN $@ 2316 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2317 2318compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2319 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2320 $(if $(CONFIG_MODULES), modules.order) FORCE 2321 $(call if_changed,gen_compile_commands) 2322 2323targets += compile_commands.json 2324 2325PHONY += clang-tidy clang-analyzer 2326 2327ifdef CONFIG_CC_IS_CLANG 2328quiet_cmd_clang_tools = CHECK $< 2329 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2330 2331clang-tidy clang-analyzer: compile_commands.json 2332 $(call cmd,clang_tools) 2333else 2334clang-tidy clang-analyzer: 2335 @echo "$@ requires CC=clang" >&2 2336 @false 2337endif 2338 2339# Scripts to check various things for consistency 2340# --------------------------------------------------------------------------- 2341 2342PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2343 2344includecheck: 2345 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2346 -name '*.[hcS]' -type f -print | sort \ 2347 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2348 2349versioncheck: 2350 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2351 -name '*.[hcS]' -type f -print | sort \ 2352 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2353 2354coccicheck: 2355 $(Q)$(BASH) $(srctree)/scripts/$@ 2356 2357kconfig-sym-check: 2358 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2359 2360PHONY += checkstack kernelrelease kernelversion image_name 2361 2362# UML needs a little special treatment here. It wants to use the host 2363# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2364# else wants $(ARCH), including people doing cross-builds, which means 2365# that $(SUBARCH) doesn't work here. 2366ifeq ($(ARCH), um) 2367CHECKSTACK_ARCH := $(SUBARCH) 2368else 2369CHECKSTACK_ARCH := $(ARCH) 2370endif 2371MINSTACKSIZE ?= 100 2372checkstack: 2373 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2374 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2375 2376kernelrelease: 2377 @$(filechk_kernel.release) 2378 2379kernelversion: 2380 @echo $(KERNELVERSION) 2381 2382image_name: 2383 @echo $(KBUILD_IMAGE) 2384 2385PHONY += run-command 2386run-command: 2387 $(Q)$(KBUILD_RUN_COMMAND) 2388 2389quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2390 cmd_rmfiles = rm -rf $(rm-files) 2391 2392# read saved command lines for existing targets 2393existing-targets := $(wildcard $(sort $(targets))) 2394 2395-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2396 2397endif # config-build 2398endif # mixed-build 2399endif # need-sub-make 2400 2401PHONY += FORCE 2402FORCE: 2403 2404# Declare the contents of the PHONY variable as phony. We keep that 2405# information in a variable so we can use it in if_changed and friends. 2406.PHONY: $(PHONY) 2407