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