1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 0 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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 -Aunused_features \ 480 -Dnon_ascii_idents \ 481 -Dunsafe_op_in_unsafe_fn \ 482 -Wmissing_docs \ 483 -Wrust_2018_idioms \ 484 -Wunreachable_pub \ 485 -Wclippy::all \ 486 -Wclippy::as_ptr_cast_mut \ 487 -Wclippy::as_underscore \ 488 -Wclippy::cast_lossless \ 489 -Wclippy::ignored_unit_patterns \ 490 -Wclippy::mut_mut \ 491 -Wclippy::needless_bitwise_bool \ 492 -Aclippy::needless_lifetimes \ 493 -Wclippy::no_mangle_with_rust_abi \ 494 -Wclippy::ptr_as_ptr \ 495 -Wclippy::ptr_cast_constness \ 496 -Wclippy::ref_as_ptr \ 497 -Wclippy::undocumented_unsafe_blocks \ 498 -Wclippy::unnecessary_safety_comment \ 499 -Wclippy::unnecessary_safety_doc \ 500 -Wrustdoc::missing_crate_level_docs \ 501 -Wrustdoc::unescaped_backticks 502 503KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 504 $(HOSTCFLAGS) -I $(srctree)/scripts/include 505KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 506 -I $(srctree)/scripts/include 507KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 508 -Zallow-features= $(HOSTRUSTFLAGS) 509KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 510KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 511KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 512 513# Make variables (CC, etc...) 514CPP = $(CC) -E 515ifneq ($(LLVM),) 516CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 517LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 518AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 519NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 520OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 521OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 522READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 523STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 524else 525CC = $(CROSS_COMPILE)gcc 526LD = $(CROSS_COMPILE)ld 527AR = $(CROSS_COMPILE)ar 528NM = $(CROSS_COMPILE)nm 529OBJCOPY = $(CROSS_COMPILE)objcopy 530OBJDUMP = $(CROSS_COMPILE)objdump 531READELF = $(CROSS_COMPILE)readelf 532STRIP = $(CROSS_COMPILE)strip 533endif 534RUSTC = rustc 535RUSTDOC = rustdoc 536RUSTFMT = rustfmt 537CLIPPY_DRIVER = clippy-driver 538BINDGEN = bindgen 539PAHOLE = pahole 540RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 541LEX = flex 542YACC = bison 543AWK = awk 544INSTALLKERNEL := installkernel 545PERL = perl 546PYTHON3 = python3 547CHECK = sparse 548BASH = bash 549KGZIP = gzip 550KBZIP2 = bzip2 551KLZOP = lzop 552LZMA = lzma 553LZ4 = lz4 554XZ = xz 555ZSTD = zstd 556TAR = tar 557 558CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 559 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 560NOSTDINC_FLAGS := 561CFLAGS_MODULE = 562RUSTFLAGS_MODULE = 563AFLAGS_MODULE = 564LDFLAGS_MODULE = 565CFLAGS_KERNEL = 566RUSTFLAGS_KERNEL = 567AFLAGS_KERNEL = 568LDFLAGS_vmlinux = 569 570# Use USERINCLUDE when you must reference the UAPI directories only. 571USERINCLUDE := \ 572 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 573 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 574 -I$(srctree)/include/uapi \ 575 -I$(objtree)/include/generated/uapi \ 576 -include $(srctree)/include/linux/compiler-version.h \ 577 -include $(srctree)/include/linux/kconfig.h 578 579# Use LINUXINCLUDE when you must reference the include/ directory. 580# Needed to be compatible with the O= option 581LINUXINCLUDE := \ 582 -I$(srctree)/arch/$(SRCARCH)/include \ 583 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 584 -I$(srctree)/include \ 585 -I$(objtree)/include \ 586 $(USERINCLUDE) 587 588KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 589 590KBUILD_CFLAGS := 591KBUILD_CFLAGS += -std=gnu11 592KBUILD_CFLAGS += -fshort-wchar 593KBUILD_CFLAGS += -funsigned-char 594KBUILD_CFLAGS += -fno-common 595KBUILD_CFLAGS += -fno-PIE 596KBUILD_CFLAGS += -fno-strict-aliasing 597 598KBUILD_CPPFLAGS := -D__KERNEL__ 599KBUILD_RUSTFLAGS := $(rust_common_flags) \ 600 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 601 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 602 -Csymbol-mangling-version=v0 \ 603 -Crelocation-model=static \ 604 -Zfunction-sections=n \ 605 -Wclippy::float_arithmetic 606 607KBUILD_AFLAGS_KERNEL := 608KBUILD_CFLAGS_KERNEL := 609KBUILD_RUSTFLAGS_KERNEL := 610KBUILD_AFLAGS_MODULE := -DMODULE 611KBUILD_CFLAGS_MODULE := -DMODULE 612KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 613KBUILD_LDFLAGS_MODULE := 614KBUILD_LDFLAGS := 615CLANG_FLAGS := 616 617ifeq ($(KBUILD_CLIPPY),1) 618 RUSTC_OR_CLIPPY_QUIET := CLIPPY 619 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 620else 621 RUSTC_OR_CLIPPY_QUIET := RUSTC 622 RUSTC_OR_CLIPPY = $(RUSTC) 623endif 624 625# Allows the usage of unstable features in stable compilers. 626export RUSTC_BOOTSTRAP := 1 627 628# Allows finding `.clippy.toml` in out-of-srctree builds. 629export CLIPPY_CONF_DIR := $(srctree) 630 631export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 632export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 633export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 634export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 635export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 636export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 637export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 638export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 639 640export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 641export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 642export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 643export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 644export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 645export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 646 647# Files to ignore in find ... statements 648 649export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 650 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 651 -prune -o 652 653# =========================================================================== 654# Rules shared between *config targets and build targets 655 656# Basic helpers built in scripts/basic/ 657PHONY += scripts_basic 658scripts_basic: 659 $(Q)$(MAKE) $(build)=scripts/basic 660 661PHONY += outputmakefile 662ifdef building_out_of_srctree 663# Before starting out-of-tree build, make sure the source tree is clean. 664# outputmakefile generates a Makefile in the output directory, if using a 665# separate output directory. This allows convenient use of make in the 666# output directory. 667# At the same time when output Makefile generated, generate .gitignore to 668# ignore whole output directory 669 670ifdef KBUILD_EXTMOD 671print_env_for_makefile = \ 672 echo "export KBUILD_OUTPUT = $(objtree)"; \ 673 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 674 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 675else 676print_env_for_makefile = \ 677 echo "export KBUILD_OUTPUT = $(CURDIR)" 678endif 679 680quiet_cmd_makefile = GEN Makefile 681 cmd_makefile = { \ 682 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 683 $(print_env_for_makefile); \ 684 echo "include $(abs_srctree)/Makefile"; \ 685 } > Makefile 686 687outputmakefile: 688ifeq ($(KBUILD_EXTMOD),) 689 @if [ -f $(srctree)/.config -o \ 690 -d $(srctree)/include/config -o \ 691 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 692 echo >&2 "***"; \ 693 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 694 echo >&2 "*** in $(abs_srctree)";\ 695 echo >&2 "***"; \ 696 false; \ 697 fi 698else 699 @if [ -f $(srcroot)/modules.order ]; then \ 700 echo >&2 "***"; \ 701 echo >&2 "*** The external module source tree is not clean."; \ 702 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 703 echo >&2 "***"; \ 704 false; \ 705 fi 706endif 707 $(Q)ln -fsn $(srcroot) source 708 $(call cmd,makefile) 709 $(Q)test -e .gitignore || \ 710 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 711endif 712 713# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 714# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 715# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 716# Kconfig (so they need export), and from include/config/auto.conf.cmd to 717# detect the version changes between builds. 718CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 719RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 720PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 721 722ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 723include $(srctree)/scripts/Makefile.clang 724endif 725 726# Include this also for config targets because some architectures need 727# cc-cross-prefix to determine CROSS_COMPILE. 728ifdef need-compiler 729include $(srctree)/scripts/Makefile.compiler 730endif 731 732ifdef config-build 733# =========================================================================== 734# *config targets only - make sure prerequisites are updated, and descend 735# in scripts/kconfig to make the *config target 736 737# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 738# KBUILD_DEFCONFIG may point out an alternative default configuration 739# used for 'make defconfig' 740include $(srctree)/arch/$(SRCARCH)/Makefile 741export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 742 743config: outputmakefile scripts_basic FORCE 744 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 745 746%config: outputmakefile scripts_basic FORCE 747 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 748 749else #!config-build 750# =========================================================================== 751# Build targets only - this includes vmlinux, arch-specific targets, clean 752# targets and others. In general all targets except *config targets. 753 754# If building an external module we do not care about the all: rule 755# but instead __all depend on modules 756PHONY += all 757ifeq ($(KBUILD_EXTMOD),) 758__all: all 759else 760__all: modules 761endif 762 763targets := 764 765# Decide whether to build built-in, modular, or both. 766# Normally, just do built-in. 767 768KBUILD_MODULES := 769KBUILD_BUILTIN := y 770 771# If we have only "make modules", don't compile built-in objects. 772ifeq ($(MAKECMDGOALS),modules) 773 KBUILD_BUILTIN := 774endif 775 776# If we have "make <whatever> modules", compile modules 777# in addition to whatever we do anyway. 778# Just "make" or "make all" shall build modules as well 779 780ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 781 KBUILD_MODULES := y 782endif 783 784ifeq ($(MAKECMDGOALS),) 785 KBUILD_MODULES := y 786endif 787 788export KBUILD_MODULES KBUILD_BUILTIN 789 790ifdef need-config 791include $(objtree)/include/config/auto.conf 792endif 793 794ifeq ($(KBUILD_EXTMOD),) 795# Objects we will link into vmlinux / subdirs we need to visit 796core-y := 797drivers-y := 798libs-y := lib/ 799endif # KBUILD_EXTMOD 800 801# The all: target is the default when no target is given on the 802# command line. 803# This allow a user to issue only 'make' to build a kernel including modules 804# Defaults to vmlinux, but the arch makefile usually adds further targets 805all: vmlinux 806 807CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 808ifdef CONFIG_CC_IS_GCC 809CFLAGS_GCOV += -fno-tree-loop-im 810endif 811export CFLAGS_GCOV 812 813# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 814ifdef CONFIG_FUNCTION_TRACER 815 CC_FLAGS_FTRACE := -pg 816endif 817 818ifdef CONFIG_TRACEPOINTS 819# To check for unused tracepoints (tracepoints that are defined but never 820# called), run with: 821# 822# make UT=1 823# 824# Each unused tracepoints can take up to 5KB of memory in the running kernel. 825# It is best to remove any that are not used. 826# 827# This command line option will be removed when all current unused 828# tracepoints are removed. 829 830ifeq ("$(origin UT)", "command line") 831 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 832endif 833endif # CONFIG_TRACEPOINTS 834 835export WARN_ON_UNUSED_TRACEPOINTS 836 837include $(srctree)/arch/$(SRCARCH)/Makefile 838 839ifdef need-config 840ifdef may-sync-config 841# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 842# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 843# because some architectures define CROSS_COMPILE there. 844include include/config/auto.conf.cmd 845 846$(KCONFIG_CONFIG): 847 @echo >&2 '***' 848 @echo >&2 '*** Configuration file "$@" not found!' 849 @echo >&2 '***' 850 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 851 @echo >&2 '*** "make menuconfig" or "make xconfig").' 852 @echo >&2 '***' 853 @/bin/false 854 855# The actual configuration files used during the build are stored in 856# include/generated/ and include/config/. Update them if .config is newer than 857# include/config/auto.conf (which mirrors .config). 858# 859# This exploits the 'multi-target pattern rule' trick. 860# The syncconfig should be executed only once to make all the targets. 861# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 862# 863# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 864# so you cannot notice that Kconfig is waiting for the user input. 865%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 866 $(Q)$(kecho) " SYNC $@" 867 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 868else # !may-sync-config 869# External modules and some install targets need include/generated/autoconf.h 870# and include/config/auto.conf but do not care if they are up-to-date. 871# Use auto.conf to show the error message 872 873checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 874missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 875 876ifdef missing-configs 877PHONY += $(objtree)/include/config/auto.conf 878 879$(objtree)/include/config/auto.conf: 880 @echo >&2 '***' 881 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 882 @printf >&2 '*** - %s\n' $(missing-configs) 883 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 884 @echo >&2 '***' 885 @/bin/false 886endif 887 888endif # may-sync-config 889endif # need-config 890 891KBUILD_CFLAGS += -fno-delete-null-pointer-checks 892 893ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 894KBUILD_CFLAGS += -O2 895KBUILD_RUSTFLAGS += -Copt-level=2 896else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 897KBUILD_CFLAGS += -Os 898KBUILD_RUSTFLAGS += -Copt-level=s 899endif 900 901# Always set `debug-assertions` and `overflow-checks` because their default 902# depends on `opt-level` and `debug-assertions`, respectively. 903KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 904KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 905 906# Tell gcc to never replace conditional load with a non-conditional one 907ifdef CONFIG_CC_IS_GCC 908# gcc-10 renamed --param=allow-store-data-races=0 to 909# -fno-allow-store-data-races. 910KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 911KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 912endif 913 914ifdef CONFIG_READABLE_ASM 915# Disable optimizations that make assembler listings hard to read. 916# reorder blocks reorders the control in the function 917# ipa clone creates specialized cloned functions 918# partial inlining inlines only parts of functions 919KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 920endif 921 922stackp-flags-y := -fno-stack-protector 923stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 924stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 925 926KBUILD_CFLAGS += $(stackp-flags-y) 927 928ifdef CONFIG_FRAME_POINTER 929KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 930KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 931else 932# Some targets (ARM with Thumb2, for example), can't be built with frame 933# pointers. For those, we don't have FUNCTION_TRACER automatically 934# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 935# incompatible with -fomit-frame-pointer with current GCC, so we don't use 936# -fomit-frame-pointer with FUNCTION_TRACER. 937# In the Rust target specification, "frame-pointer" is set explicitly 938# to "may-omit". 939ifndef CONFIG_FUNCTION_TRACER 940KBUILD_CFLAGS += -fomit-frame-pointer 941endif 942endif 943 944# Initialize all stack variables with a 0xAA pattern. 945ifdef CONFIG_INIT_STACK_ALL_PATTERN 946KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 947endif 948 949# Initialize all stack variables with a zero value. 950ifdef CONFIG_INIT_STACK_ALL_ZERO 951KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 952ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 953# https://github.com/llvm/llvm-project/issues/44842 954CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 955export CC_AUTO_VAR_INIT_ZERO_ENABLER 956KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 957endif 958endif 959 960ifdef CONFIG_CC_IS_CLANG 961ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 962KBUILD_CFLAGS += -fexperimental-late-parse-attributes 963endif 964endif 965 966# Explicitly clear padding bits during variable initialization 967KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 968 969# While VLAs have been removed, GCC produces unreachable stack probes 970# for the randomize_kstack_offset feature. Disable it for all compilers. 971KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 972 973# Get details on warnings generated due to GCC value tracking. 974KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 975 976# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 977ifdef CONFIG_ZERO_CALL_USED_REGS 978KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 979endif 980 981ifdef CONFIG_FUNCTION_TRACER 982ifdef CONFIG_FTRACE_MCOUNT_USE_CC 983 CC_FLAGS_FTRACE += -mrecord-mcount 984 ifdef CONFIG_HAVE_NOP_MCOUNT 985 ifeq ($(call cc-option-yn, -mnop-mcount),y) 986 CC_FLAGS_FTRACE += -mnop-mcount 987 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 988 endif 989 endif 990endif 991ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 992 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 993 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 994 endif 995endif 996ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 997 ifdef CONFIG_HAVE_C_RECORDMCOUNT 998 BUILD_C_RECORDMCOUNT := y 999 export BUILD_C_RECORDMCOUNT 1000 endif 1001endif 1002ifdef CONFIG_HAVE_FENTRY 1003 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1004 ifeq ($(call cc-option-yn, -mfentry),y) 1005 CC_FLAGS_FTRACE += -mfentry 1006 CC_FLAGS_USING += -DCC_USING_FENTRY 1007 endif 1008endif 1009export CC_FLAGS_FTRACE 1010KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1011KBUILD_AFLAGS += $(CC_FLAGS_USING) 1012endif 1013 1014# We trigger additional mismatches with less inlining 1015ifdef CONFIG_DEBUG_SECTION_MISMATCH 1016KBUILD_CFLAGS += -fno-inline-functions-called-once 1017endif 1018 1019# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1020ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1021KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1022KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1023LDFLAGS_vmlinux += --gc-sections 1024endif 1025 1026ifdef CONFIG_SHADOW_CALL_STACK 1027ifndef CONFIG_DYNAMIC_SCS 1028CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1029KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1030KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1031endif 1032export CC_FLAGS_SCS 1033endif 1034 1035ifdef CONFIG_LTO_CLANG 1036ifdef CONFIG_LTO_CLANG_THIN 1037CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1038else 1039CC_FLAGS_LTO := -flto 1040endif 1041CC_FLAGS_LTO += -fvisibility=hidden 1042 1043# Limit inlining across translation units to reduce binary size 1044KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1045endif 1046 1047ifdef CONFIG_LTO 1048KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1049KBUILD_AFLAGS += -fno-lto 1050export CC_FLAGS_LTO 1051endif 1052 1053ifdef CONFIG_CFI 1054CC_FLAGS_CFI := -fsanitize=kcfi 1055ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1056 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1057endif 1058ifdef CONFIG_FINEIBT_BHI 1059 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1060endif 1061ifdef CONFIG_RUST 1062 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1063 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1064 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1065 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1066 export RUSTC_FLAGS_CFI 1067endif 1068KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1069export CC_FLAGS_CFI 1070endif 1071 1072# Architectures can define flags to add/remove for floating-point support 1073CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1074export CC_FLAGS_FPU 1075export CC_FLAGS_NO_FPU 1076 1077ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1078# Set the minimal function alignment. Use the newer GCC option 1079# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1080# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1081ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1082KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1083else 1084KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1085endif 1086endif 1087 1088# arch Makefile may override CC so keep this after arch Makefile is included 1089NOSTDINC_FLAGS += -nostdinc 1090 1091# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1092# the kernel uses only C99 flexible arrays for dynamically sized trailing 1093# arrays. Enforce this for everything that may examine structure sizes and 1094# perform bounds checking. 1095KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1096 1097# Allow including a tagged struct or union anonymously in another struct/union. 1098KBUILD_CFLAGS += -fms-extensions 1099 1100# disable invalid "can't wrap" optimizations for signed / pointers 1101KBUILD_CFLAGS += -fno-strict-overflow 1102 1103# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1104KBUILD_CFLAGS += -fno-stack-check 1105 1106# conserve stack if available 1107ifdef CONFIG_CC_IS_GCC 1108KBUILD_CFLAGS += -fconserve-stack 1109endif 1110 1111# Ensure compilers do not transform certain loops into calls to wcslen() 1112KBUILD_CFLAGS += -fno-builtin-wcslen 1113 1114# change __FILE__ to the relative path to the source directory 1115ifdef building_out_of_srctree 1116KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1117ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1118KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1119endif 1120endif 1121 1122# include additional Makefiles when needed 1123include-y := scripts/Makefile.warn 1124include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1125include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1126include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1127include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1128include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1129include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1130include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1131include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1132include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1133include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1134include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1135include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1136include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1137 1138include $(addprefix $(srctree)/, $(include-y)) 1139 1140# scripts/Makefile.gcc-plugins is intentionally included last. 1141# Do not add $(call cc-option,...) below this line. When you build the kernel 1142# from the clean source tree, the GCC plugins do not exist at this point. 1143 1144# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1145KBUILD_CPPFLAGS += $(KCPPFLAGS) 1146KBUILD_AFLAGS += $(KAFLAGS) 1147KBUILD_CFLAGS += $(KCFLAGS) 1148KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1149 1150KBUILD_LDFLAGS_MODULE += --build-id=sha1 1151LDFLAGS_vmlinux += --build-id=sha1 1152 1153KBUILD_LDFLAGS += -z noexecstack 1154ifeq ($(CONFIG_LD_IS_BFD),y) 1155KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1156endif 1157 1158ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1159LDFLAGS_vmlinux += -X 1160endif 1161 1162ifeq ($(CONFIG_RELR),y) 1163# ld.lld before 15 did not support -z pack-relative-relocs. 1164LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1165endif 1166 1167# We never want expected sections to be placed heuristically by the 1168# linker. All sections should be explicitly named in the linker script. 1169ifdef CONFIG_LD_ORPHAN_WARN 1170LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1171endif 1172 1173ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1174LDFLAGS_vmlinux += --emit-relocs --discard-none 1175endif 1176 1177# Align the architecture of userspace programs with the kernel 1178USERFLAGS_FROM_KERNEL := --target=% 1179 1180ifdef CONFIG_ARCH_USERFLAGS 1181KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1182KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1183else 1184# If not overridden also inherit the bit size 1185USERFLAGS_FROM_KERNEL += -m32 -m64 1186endif 1187 1188KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1189KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1190 1191# userspace programs are linked via the compiler, use the correct linker 1192ifdef CONFIG_CC_IS_CLANG 1193KBUILD_USERLDFLAGS += --ld-path=$(LD) 1194endif 1195 1196# make the checker run with the right architecture 1197CHECKFLAGS += --arch=$(ARCH) 1198 1199# insure the checker run with the right endianness 1200CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1201 1202# the checker needs the correct machine size 1203CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1204 1205# Validate the checker is available and functional 1206ifneq ($(KBUILD_CHECKSRC), 0) 1207 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1208 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1209 KBUILD_CHECKSRC = 0 1210 endif 1211endif 1212 1213# Default kernel image to build when no specific target is given. 1214# KBUILD_IMAGE may be overruled on the command line or 1215# set in the environment 1216# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1217# this default value 1218export KBUILD_IMAGE ?= vmlinux 1219 1220# 1221# INSTALL_PATH specifies where to place the updated kernel and system map 1222# images. Default is /boot, but you can set it to other values 1223export INSTALL_PATH ?= /boot 1224 1225# 1226# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1227# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1228# an argument if needed. Otherwise it defaults to the kernel install path 1229# 1230export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1231 1232# 1233# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1234# relocations required by build roots. This is not defined in the 1235# makefile but the argument can be passed to make if needed. 1236# 1237 1238MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1239export MODLIB 1240 1241PHONY += prepare0 1242 1243ifeq ($(KBUILD_EXTMOD),) 1244 1245build-dir := . 1246clean-dirs := $(sort . Documentation \ 1247 $(patsubst %/,%,$(filter %/, $(core-) \ 1248 $(drivers-) $(libs-)))) 1249 1250export ARCH_CORE := $(core-y) 1251export ARCH_LIB := $(filter %/, $(libs-y)) 1252export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1253# Externally visible symbols (used by link-vmlinux.sh) 1254 1255KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1256KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1257 1258export KBUILD_VMLINUX_LIBS 1259export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1260 1261ifdef CONFIG_TRIM_UNUSED_KSYMS 1262# For the kernel to actually contain only the needed exported symbols, 1263# we have to build modules as well to determine what those symbols are. 1264KBUILD_MODULES := y 1265endif 1266 1267# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1268quiet_cmd_ar_vmlinux.a = AR $@ 1269 cmd_ar_vmlinux.a = \ 1270 rm -f $@; \ 1271 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1272 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1273 1274targets += vmlinux.a 1275vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1276 $(call if_changed,ar_vmlinux.a) 1277 1278PHONY += vmlinux_o 1279vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1280 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1281 1282vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1283 @: 1284 1285PHONY += vmlinux 1286# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1287# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1288# unrelated; the decompressors just happen to have the same base name, 1289# arch/*/boot/compressed/vmlinux. 1290# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1291# 1292# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1293# https://savannah.gnu.org/bugs/?61463 1294# For Make > 4.4, the following simple code will work: 1295# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1296vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1297vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1298vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1299 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1300 1301# The actual objects are generated when descending, 1302# make sure no implicit rule kicks in 1303$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1304 1305ifeq ($(origin KERNELRELEASE),file) 1306filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1307else 1308filechk_kernel.release = echo $(KERNELRELEASE) 1309endif 1310 1311# Store (new) KERNELRELEASE string in include/config/kernel.release 1312include/config/kernel.release: FORCE 1313 $(call filechk,kernel.release) 1314 1315# Additional helpers built in scripts/ 1316# Carefully list dependencies so we do not try to build scripts twice 1317# in parallel 1318PHONY += scripts 1319scripts: scripts_basic scripts_dtc 1320 $(Q)$(MAKE) $(build)=$(@) 1321 1322# Things we need to do before we recursively start building the kernel 1323# or the modules are listed in "prepare". 1324# A multi level approach is used. prepareN is processed before prepareN-1. 1325# archprepare is used in arch Makefiles and when processed asm symlink, 1326# version.h and scripts_basic is processed / created. 1327 1328PHONY += prepare archprepare 1329 1330archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1331 asm-generic $(version_h) include/generated/utsrelease.h \ 1332 include/generated/compile.h include/generated/autoconf.h \ 1333 include/generated/rustc_cfg remove-stale-files 1334 1335prepare0: archprepare 1336 $(Q)$(MAKE) $(build)=scripts/mod 1337 $(Q)$(MAKE) $(build)=. prepare 1338 1339# All the preparing.. 1340prepare: prepare0 1341ifdef CONFIG_RUST 1342 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1343 $(Q)$(MAKE) $(build)=rust 1344endif 1345 1346PHONY += remove-stale-files 1347remove-stale-files: 1348 $(Q)$(srctree)/scripts/remove-stale-files 1349 1350# Support for using generic headers in asm-generic 1351asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1352 1353PHONY += asm-generic uapi-asm-generic 1354asm-generic: uapi-asm-generic 1355 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1356 generic=include/asm-generic 1357uapi-asm-generic: 1358 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1359 generic=include/uapi/asm-generic 1360 1361# Generate some files 1362# --------------------------------------------------------------------------- 1363 1364# KERNELRELEASE can change from a few different places, meaning version.h 1365# needs to be updated, so this check is forced on all builds 1366 1367uts_len := 64 1368define filechk_utsrelease.h 1369 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1370 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1371 exit 1; \ 1372 fi; \ 1373 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1374endef 1375 1376define filechk_version.h 1377 if [ $(SUBLEVEL) -gt 255 ]; then \ 1378 echo \#define LINUX_VERSION_CODE $(shell \ 1379 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1380 else \ 1381 echo \#define LINUX_VERSION_CODE $(shell \ 1382 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1383 fi; \ 1384 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1385 ((c) > 255 ? 255 : (c)))'; \ 1386 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1387 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1388 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1389endef 1390 1391$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1392$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1393$(version_h): FORCE 1394 $(call filechk,version.h) 1395 1396include/generated/utsrelease.h: include/config/kernel.release FORCE 1397 $(call filechk,utsrelease.h) 1398 1399filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1400 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1401 1402include/generated/compile.h: FORCE 1403 $(call filechk,compile.h) 1404 1405PHONY += headerdep 1406headerdep: 1407 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1408 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1409 1410# --------------------------------------------------------------------------- 1411# Kernel headers 1412 1413#Default location for installed headers 1414export INSTALL_HDR_PATH = $(objtree)/usr 1415 1416quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1417 cmd_headers_install = \ 1418 mkdir -p $(INSTALL_HDR_PATH); \ 1419 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1420 usr/include $(INSTALL_HDR_PATH) 1421 1422PHONY += headers_install 1423headers_install: headers 1424 $(call cmd,headers_install) 1425 1426PHONY += archheaders archscripts 1427 1428hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1429 1430PHONY += headers 1431headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1432ifdef HEADER_ARCH 1433 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1434else 1435 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1436 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1437endif 1438 1439ifdef CONFIG_HEADERS_INSTALL 1440prepare: headers 1441endif 1442 1443PHONY += usr_gen_init_cpio 1444usr_gen_init_cpio: scripts_basic 1445 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1446 1447PHONY += scripts_unifdef 1448scripts_unifdef: scripts_basic 1449 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1450 1451PHONY += scripts_gen_packed_field_checks 1452scripts_gen_packed_field_checks: scripts_basic 1453 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1454 1455# --------------------------------------------------------------------------- 1456# Install 1457 1458# Many distributions have the custom install script, /sbin/installkernel. 1459# If DKMS is installed, 'make install' will eventually recurse back 1460# to this Makefile to build and install external modules. 1461# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1462 1463quiet_cmd_install = INSTALL $(INSTALL_PATH) 1464 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1465 1466# --------------------------------------------------------------------------- 1467# vDSO install 1468 1469PHONY += vdso_install 1470vdso_install: export INSTALL_FILES = $(vdso-install-y) 1471vdso_install: 1472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1473 1474# --------------------------------------------------------------------------- 1475# Tools 1476 1477ifdef CONFIG_OBJTOOL 1478prepare: tools/objtool 1479endif 1480 1481ifdef CONFIG_BPF 1482ifdef CONFIG_DEBUG_INFO_BTF 1483prepare: tools/bpf/resolve_btfids 1484endif 1485endif 1486 1487# The tools build system is not a part of Kbuild and tends to introduce 1488# its own unique issues. If you need to integrate a new tool into Kbuild, 1489# please consider locating that tool outside the tools/ tree and using the 1490# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1491# here. See Documentation/kbuild/makefiles.rst for details. 1492 1493PHONY += resolve_btfids_clean 1494 1495resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1496 1497# tools/bpf/resolve_btfids directory might not exist 1498# in output directory, skip its clean in that case 1499resolve_btfids_clean: 1500ifneq ($(wildcard $(resolve_btfids_O)),) 1501 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1502endif 1503 1504PHONY += objtool_clean objtool_mrproper 1505 1506objtool_O = $(abspath $(objtree))/tools/objtool 1507 1508objtool_clean objtool_mrproper: 1509ifneq ($(wildcard $(objtool_O)),) 1510 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1511endif 1512 1513tools/: FORCE 1514 $(Q)mkdir -p $(objtree)/tools 1515 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1516 1517tools/%: FORCE 1518 $(Q)mkdir -p $(objtree)/tools 1519 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1520 1521# --------------------------------------------------------------------------- 1522# Kernel selftest 1523 1524PHONY += kselftest 1525kselftest: headers 1526 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1527 1528kselftest-%: headers FORCE 1529 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1530 1531PHONY += kselftest-merge 1532kselftest-merge: 1533 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1534 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1535 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1536 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1537 1538# --------------------------------------------------------------------------- 1539# Devicetree files 1540 1541ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1542dtstree := arch/$(SRCARCH)/boot/dts 1543endif 1544 1545dtbindingtree := Documentation/devicetree/bindings 1546 1547%.yaml: dtbs_prepare 1548 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1549 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1550 1551ifneq ($(dtstree),) 1552 1553%.dtb: dtbs_prepare 1554 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1555 1556%.dtbo: dtbs_prepare 1557 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1558 1559PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1560dtbs: dtbs_prepare 1561 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1562 1563# include/config/kernel.release is actually needed when installing DTBs because 1564# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1565# dtbs_install depend on it as dtbs_install may run as root. 1566dtbs_prepare: include/config/kernel.release scripts_dtc 1567 1568ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1569export CHECK_DTBS=y 1570endif 1571 1572ifneq ($(CHECK_DTBS),) 1573dtbs_prepare: dt_binding_schemas 1574endif 1575 1576dtbs_check: dtbs 1577 1578dtbs_install: 1579 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1580 1581ifdef CONFIG_OF_EARLY_FLATTREE 1582all: dtbs 1583endif 1584 1585ifdef CONFIG_GENERIC_BUILTIN_DTB 1586vmlinux: dtbs 1587endif 1588 1589endif 1590 1591PHONY += scripts_dtc 1592scripts_dtc: scripts_basic 1593 $(Q)$(MAKE) $(build)=scripts/dtc 1594 1595ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1596export CHECK_DTBS=y 1597endif 1598 1599PHONY += dt_binding_check dt_binding_schemas 1600dt_binding_check: dt_binding_schemas scripts_dtc 1601 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1602 1603dt_binding_schemas: 1604 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1605 1606PHONY += dt_compatible_check 1607dt_compatible_check: dt_binding_schemas 1608 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1609 1610# --------------------------------------------------------------------------- 1611# Modules 1612 1613ifdef CONFIG_MODULES 1614 1615# By default, build modules as well 1616 1617all: modules 1618 1619# When we're building modules with modversions, we need to consider 1620# the built-in objects during the descend as well, in order to 1621# make sure the checksums are up to date before we record them. 1622ifdef CONFIG_MODVERSIONS 1623 KBUILD_BUILTIN := y 1624endif 1625 1626# Build modules 1627# 1628 1629# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1630# is an exception. 1631ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1632KBUILD_BUILTIN := y 1633modules: vmlinux 1634endif 1635 1636modules: modules_prepare 1637 1638# Target to prepare building external modules 1639modules_prepare: prepare 1640 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1641 1642endif # CONFIG_MODULES 1643 1644### 1645# Cleaning is done on three levels. 1646# make clean Delete most generated files 1647# Leave enough to build external modules 1648# make mrproper Delete the current configuration, and all generated files 1649# make distclean Remove editor backup files, patch leftover files and the like 1650 1651# Directories & files removed with 'make clean' 1652CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1653 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1654 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1655 compile_commands.json rust/test \ 1656 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1657 .builtin-dtbs-list .builtin-dtb.S 1658 1659# Directories & files removed with 'make mrproper' 1660MRPROPER_FILES += include/config include/generated \ 1661 arch/$(SRCARCH)/include/generated .objdiff \ 1662 debian snap tar-install PKGBUILD pacman \ 1663 .config .config.old .version \ 1664 Module.symvers \ 1665 certs/signing_key.pem \ 1666 certs/x509.genkey \ 1667 vmlinux-gdb.py \ 1668 rpmbuild \ 1669 rust/libmacros.so rust/libmacros.dylib \ 1670 rust/libpin_init_internal.so rust/libpin_init_internal.dylib 1671 1672# clean - Delete most, but leave enough to build external modules 1673# 1674clean: private rm-files := $(CLEAN_FILES) 1675 1676PHONY += archclean vmlinuxclean 1677 1678vmlinuxclean: 1679 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1680 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1681 1682clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1683 1684# mrproper - Delete all generated files, including .config 1685# 1686mrproper: private rm-files := $(MRPROPER_FILES) 1687mrproper-dirs := $(addprefix _mrproper_,scripts) 1688 1689PHONY += $(mrproper-dirs) mrproper 1690$(mrproper-dirs): 1691 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1692 1693mrproper: clean objtool_mrproper $(mrproper-dirs) 1694 $(call cmd,rmfiles) 1695 @find . $(RCS_FIND_IGNORE) \ 1696 \( -name '*.rmeta' \) \ 1697 -type f -print | xargs rm -f 1698 1699# distclean 1700# 1701PHONY += distclean 1702 1703distclean: mrproper 1704 @find . $(RCS_FIND_IGNORE) \ 1705 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1706 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1707 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1708 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1709 -type f -print | xargs rm -f 1710 1711 1712# Packaging of the kernel to various formats 1713# --------------------------------------------------------------------------- 1714 1715modules-cpio-pkg: usr_gen_init_cpio 1716 1717%src-pkg: FORCE 1718 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1719%pkg: include/config/kernel.release FORCE 1720 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1721 1722# Brief documentation of the typical targets used 1723# --------------------------------------------------------------------------- 1724 1725boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1726boards := $(sort $(notdir $(boards))) 1727board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1728board-dirs := $(sort $(notdir $(board-dirs:/=))) 1729 1730PHONY += help 1731help: 1732 @echo 'Cleaning targets:' 1733 @echo ' clean - Remove most generated files but keep the config and' 1734 @echo ' enough build support to build external modules' 1735 @echo ' mrproper - Remove all generated files + config + various backup files' 1736 @echo ' distclean - mrproper + remove editor backup and patch files' 1737 @echo '' 1738 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1739 @echo '' 1740 @echo 'Other generic targets:' 1741 @echo ' all - Build all targets marked with [*]' 1742 @echo '* vmlinux - Build the bare kernel' 1743 @echo '* modules - Build all modules' 1744 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1745 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1746 @echo ' dir/ - Build all files in dir and below' 1747 @echo ' dir/file.[ois] - Build specified target only' 1748 @echo ' dir/file.ll - Build the LLVM assembly file' 1749 @echo ' (requires compiler support for LLVM assembly generation)' 1750 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1751 @echo ' (requires a recent binutils and recent build (System.map))' 1752 @echo ' dir/file.ko - Build module including final link' 1753 @echo ' modules_prepare - Set up for building external modules' 1754 @echo ' tags/TAGS - Generate tags file for editors' 1755 @echo ' cscope - Generate cscope index' 1756 @echo ' gtags - Generate GNU GLOBAL index' 1757 @echo ' kernelrelease - Output the release version string (use with make -s)' 1758 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1759 @echo ' image_name - Output the image name (use with make -s)' 1760 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1761 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1762 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1763 echo '' 1764 @echo 'Static analysers:' 1765 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1766 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1767 @echo ' versioncheck - Sanity check on version.h usage' 1768 @echo ' includecheck - Check for duplicate included header files' 1769 @echo ' headerdep - Detect inclusion cycles in headers' 1770 @echo ' coccicheck - Check with Coccinelle' 1771 @echo ' clang-analyzer - Check with clang static analyzer' 1772 @echo ' clang-tidy - Check with clang-tidy' 1773 @echo '' 1774 @echo 'Tools:' 1775 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1776 @echo '' 1777 @echo 'Kernel selftest:' 1778 @echo ' kselftest - Build and run kernel selftest' 1779 @echo ' Build, install, and boot kernel before' 1780 @echo ' running kselftest on it' 1781 @echo ' Run as root for full coverage' 1782 @echo ' kselftest-all - Build kernel selftest' 1783 @echo ' kselftest-install - Build and install kernel selftest' 1784 @echo ' kselftest-clean - Remove all generated kselftest files' 1785 @echo ' kselftest-merge - Merge all the config dependencies of' 1786 @echo ' kselftest to existing .config.' 1787 @echo '' 1788 @echo 'Rust targets:' 1789 @echo ' rustavailable - Checks whether the Rust toolchain is' 1790 @echo ' available and, if not, explains why.' 1791 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1792 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1793 @echo ' is formatted, printing a diff otherwise.' 1794 @echo ' rustdoc - Generate Rust documentation' 1795 @echo ' (requires kernel .config)' 1796 @echo ' rusttest - Runs the Rust tests' 1797 @echo ' (requires kernel .config; downloads external repos)' 1798 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1799 @echo ' (requires kernel .config)' 1800 @echo ' dir/file.[os] - Build specified target only' 1801 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1802 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1803 @echo ' The output is not intended to be compilable.' 1804 @echo ' dir/file.ll - Build the LLVM assembly file' 1805 @echo '' 1806 @$(if $(dtstree), \ 1807 echo 'Devicetree:'; \ 1808 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1809 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1810 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1811 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1812 echo ' dtbs_check - Validate device tree source files';\ 1813 echo '') 1814 1815 @echo 'Userspace tools targets:' 1816 @echo ' use "make tools/help"' 1817 @echo ' or "cd tools; make help"' 1818 @echo '' 1819 @echo 'Kernel packaging:' 1820 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1821 @echo '' 1822 @echo 'Documentation targets:' 1823 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1824 @echo '' 1825 @echo 'Architecture-specific targets ($(SRCARCH)):' 1826 @$(or $(archhelp),\ 1827 echo ' No architecture-specific help defined for $(SRCARCH)') 1828 @echo '' 1829 @$(if $(boards), \ 1830 $(foreach b, $(boards), \ 1831 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1832 echo '') 1833 @$(if $(board-dirs), \ 1834 $(foreach b, $(board-dirs), \ 1835 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1836 printf " %-16s - Show all of the above\\n" help-boards; \ 1837 echo '') 1838 1839 @echo ' make V=n [targets] 1: verbose build' 1840 @echo ' 2: give reason for rebuild of target' 1841 @echo ' V=1 and V=2 can be combined with V=12' 1842 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1843 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1844 @echo ' (sparse by default)' 1845 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1846 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1847 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1848 @echo ' 1: warnings which may be relevant and do not occur too often' 1849 @echo ' 2: warnings which occur quite often but may still be relevant' 1850 @echo ' 3: more obscure warnings, can most likely be ignored' 1851 @echo ' c: extra checks in the configuration stage (Kconfig)' 1852 @echo ' e: warnings are being treated as errors' 1853 @echo ' Multiple levels can be combined with W=12 or W=123' 1854 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1855 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1856 @$(if $(dtstree), \ 1857 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1858 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1859 ) 1860 @echo '' 1861 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1862 @echo 'For further info see the ./README file' 1863 1864 1865help-board-dirs := $(addprefix help-,$(board-dirs)) 1866 1867help-boards: $(help-board-dirs) 1868 1869boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1870 1871$(help-board-dirs): help-%: 1872 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1873 @$(if $(boards-per-dir), \ 1874 $(foreach b, $(boards-per-dir), \ 1875 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1876 echo '') 1877 1878 1879# Documentation targets 1880# --------------------------------------------------------------------------- 1881DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1882 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1883 htmldocs-redirects 1884 1885PHONY += $(DOC_TARGETS) 1886$(DOC_TARGETS): 1887 $(Q)$(MAKE) $(build)=Documentation $@ 1888 1889 1890# Rust targets 1891# --------------------------------------------------------------------------- 1892 1893# "Is Rust available?" target 1894PHONY += rustavailable 1895rustavailable: 1896 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1897 1898# Documentation target 1899# 1900# Using the singular to avoid running afoul of `no-dot-config-targets`. 1901PHONY += rustdoc 1902rustdoc: prepare 1903 $(Q)$(MAKE) $(build)=rust $@ 1904 1905# Testing target 1906PHONY += rusttest 1907rusttest: prepare 1908 $(Q)$(MAKE) $(build)=rust $@ 1909 1910# Formatting targets 1911# 1912# Generated files as well as vendored crates are skipped. 1913PHONY += rustfmt rustfmtcheck 1914 1915rustfmt: 1916 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1917 \( \ 1918 -path $(srctree)/rust/proc-macro2 \ 1919 -o -path $(srctree)/rust/quote \ 1920 -o -path $(srctree)/rust/syn \ 1921 \) -prune -o \ 1922 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1923 | xargs $(RUSTFMT) $(rustfmt_flags) 1924 1925rustfmtcheck: rustfmt_flags = --check 1926rustfmtcheck: rustfmt 1927 1928# Misc 1929# --------------------------------------------------------------------------- 1930 1931PHONY += misc-check 1932misc-check: 1933 $(Q)$(srctree)/scripts/misc-check 1934 1935all: misc-check 1936 1937PHONY += scripts_gdb 1938scripts_gdb: prepare0 1939 $(Q)$(MAKE) $(build)=scripts/gdb 1940 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1941 1942ifdef CONFIG_GDB_SCRIPTS 1943all: scripts_gdb 1944endif 1945 1946else # KBUILD_EXTMOD 1947 1948filechk_kernel.release = echo $(KERNELRELEASE) 1949 1950### 1951# External module support. 1952# When building external modules the kernel used as basis is considered 1953# read-only, and no consistency checks are made and the make 1954# system is not used on the basis kernel. If updates are required 1955# in the basis kernel ordinary make commands (without M=...) must be used. 1956 1957# We are always building only modules. 1958KBUILD_BUILTIN := 1959KBUILD_MODULES := y 1960 1961build-dir := . 1962 1963clean-dirs := . 1964clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1965 1966PHONY += prepare 1967# now expand this into a simple variable to reduce the cost of shell evaluations 1968prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1969prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 1970prepare: 1971 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1972 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1973 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1974 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1975 fi 1976 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 1977 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 1978 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 1979 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 1980 fi 1981 1982PHONY += help 1983help: 1984 @echo ' Building external modules.' 1985 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1986 @echo '' 1987 @echo ' modules - default target, build the module(s)' 1988 @echo ' modules_install - install the module' 1989 @echo ' clean - remove generated files in module directory only' 1990 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1991 @echo '' 1992 1993ifndef CONFIG_MODULES 1994modules modules_install: __external_modules_error 1995__external_modules_error: 1996 @echo >&2 '***' 1997 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1998 @echo >&2 '*** You cannot build or install external modules.' 1999 @echo >&2 '***' 2000 @false 2001endif 2002 2003endif # KBUILD_EXTMOD 2004 2005# --------------------------------------------------------------------------- 2006# Modules 2007 2008PHONY += modules modules_install modules_sign modules_prepare 2009 2010modules_install: 2011 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2012 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2013 2014ifeq ($(CONFIG_MODULE_SIG),y) 2015# modules_sign is a subset of modules_install. 2016# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2017modules_sign: modules_install 2018 @: 2019else 2020modules_sign: 2021 @echo >&2 '***' 2022 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2023 @echo >&2 '***' 2024 @false 2025endif 2026 2027ifdef CONFIG_MODULES 2028 2029modules.order: $(build-dir) 2030 @: 2031 2032# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2033# This is solely useful to speed up test compiles. 2034modules: modpost 2035ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2036 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2037endif 2038 2039PHONY += modules_check 2040modules_check: modules.order 2041 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2042 2043else # CONFIG_MODULES 2044 2045modules: 2046 @: 2047 2048KBUILD_MODULES := 2049 2050endif # CONFIG_MODULES 2051 2052PHONY += modpost 2053modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2054 $(if $(KBUILD_MODULES), modules_check) 2055 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2056 2057# Single targets 2058# --------------------------------------------------------------------------- 2059# To build individual files in subdirectories, you can do like this: 2060# 2061# make foo/bar/baz.s 2062# 2063# The supported suffixes for single-target are listed in 'single-targets' 2064# 2065# To build only under specific subdirectories, you can do like this: 2066# 2067# make foo/bar/baz/ 2068 2069ifdef single-build 2070 2071# .ko is special because modpost is needed 2072single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2073single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2074 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2075 2076$(single-ko): single_modules 2077 @: 2078$(single-no-ko): $(build-dir) 2079 @: 2080 2081# Remove modules.order when done because it is not the real one. 2082PHONY += single_modules 2083single_modules: $(single-no-ko) modules_prepare 2084 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2085 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2086ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2087 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2088endif 2089 $(Q)rm -f modules.order 2090 2091single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2092 2093KBUILD_MODULES := y 2094 2095endif 2096 2097prepare: outputmakefile 2098 2099# Preset locale variables to speed up the build process. Limit locale 2100# tweaks to this spot to avoid wrong language settings when running 2101# make menuconfig etc. 2102# Error messages still appears in the original language 2103PHONY += $(build-dir) 2104$(build-dir): prepare 2105 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2106 2107clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2108PHONY += $(clean-dirs) clean 2109$(clean-dirs): 2110 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2111 2112clean: $(clean-dirs) 2113 $(call cmd,rmfiles) 2114 @find . $(RCS_FIND_IGNORE) \ 2115 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2116 -o -name '*.ko.*' \ 2117 -o -name '*.dtb' -o -name '*.dtbo' \ 2118 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2119 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2120 -o -name '*.dwo' -o -name '*.lst' \ 2121 -o -name '*.su' -o -name '*.mod' \ 2122 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2123 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2124 -o -name '*.asn1.[ch]' \ 2125 -o -name '*.symtypes' -o -name 'modules.order' \ 2126 -o -name '*.c.[012]*.*' \ 2127 -o -name '*.ll' \ 2128 -o -name '*.gcno' \ 2129 \) -type f -print \ 2130 -o -name '.tmp_*' -print \ 2131 | xargs rm -rf 2132 2133# Generate tags for editors 2134# --------------------------------------------------------------------------- 2135quiet_cmd_tags = GEN $@ 2136 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2137 2138tags TAGS cscope gtags: FORCE 2139 $(call cmd,tags) 2140 2141# Generate rust-project.json (a file that describes the structure of non-Cargo 2142# Rust projects) for rust-analyzer (an implementation of the Language Server 2143# Protocol). 2144PHONY += rust-analyzer 2145rust-analyzer: 2146 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2147ifdef KBUILD_EXTMOD 2148# FIXME: external modules must not descend into a sub-directory of the kernel 2149 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2150else 2151 $(Q)$(MAKE) $(build)=rust $@ 2152endif 2153 2154# Script to generate missing namespace dependencies 2155# --------------------------------------------------------------------------- 2156 2157PHONY += nsdeps 2158nsdeps: export KBUILD_NSDEPS=1 2159nsdeps: modules 2160 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2161 2162# Clang Tooling 2163# --------------------------------------------------------------------------- 2164 2165quiet_cmd_gen_compile_commands = GEN $@ 2166 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2167 2168compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2169 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2170 $(if $(CONFIG_MODULES), modules.order) FORCE 2171 $(call if_changed,gen_compile_commands) 2172 2173targets += compile_commands.json 2174 2175PHONY += clang-tidy clang-analyzer 2176 2177ifdef CONFIG_CC_IS_CLANG 2178quiet_cmd_clang_tools = CHECK $< 2179 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2180 2181clang-tidy clang-analyzer: compile_commands.json 2182 $(call cmd,clang_tools) 2183else 2184clang-tidy clang-analyzer: 2185 @echo "$@ requires CC=clang" >&2 2186 @false 2187endif 2188 2189# Scripts to check various things for consistency 2190# --------------------------------------------------------------------------- 2191 2192PHONY += includecheck versioncheck coccicheck 2193 2194includecheck: 2195 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2196 -name '*.[hcS]' -type f -print | sort \ 2197 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2198 2199versioncheck: 2200 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2201 -name '*.[hcS]' -type f -print | sort \ 2202 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2203 2204coccicheck: 2205 $(Q)$(BASH) $(srctree)/scripts/$@ 2206 2207PHONY += checkstack kernelrelease kernelversion image_name 2208 2209# UML needs a little special treatment here. It wants to use the host 2210# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2211# else wants $(ARCH), including people doing cross-builds, which means 2212# that $(SUBARCH) doesn't work here. 2213ifeq ($(ARCH), um) 2214CHECKSTACK_ARCH := $(SUBARCH) 2215else 2216CHECKSTACK_ARCH := $(ARCH) 2217endif 2218MINSTACKSIZE ?= 100 2219checkstack: 2220 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2221 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2222 2223kernelrelease: 2224 @$(filechk_kernel.release) 2225 2226kernelversion: 2227 @echo $(KERNELVERSION) 2228 2229image_name: 2230 @echo $(KBUILD_IMAGE) 2231 2232PHONY += run-command 2233run-command: 2234 $(Q)$(KBUILD_RUN_COMMAND) 2235 2236quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2237 cmd_rmfiles = rm -rf $(rm-files) 2238 2239# read saved command lines for existing targets 2240existing-targets := $(wildcard $(sort $(targets))) 2241 2242-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2243 2244endif # config-build 2245endif # mixed-build 2246endif # need-sub-make 2247 2248PHONY += FORCE 2249FORCE: 2250 2251# Declare the contents of the PHONY variable as phony. We keep that 2252# information in a variable so we can use it in if_changed and friends. 2253.PHONY: $(PHONY) 2254