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