1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 14 4SUBLEVEL = 0 5EXTRAVERSION = -rc3 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) 500KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 501 502# Make variables (CC, etc...) 503CPP = $(CC) -E 504ifneq ($(LLVM),) 505CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 506LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 507AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 508NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 509OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 510OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 511READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 512STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 513else 514CC = $(CROSS_COMPILE)gcc 515LD = $(CROSS_COMPILE)ld 516AR = $(CROSS_COMPILE)ar 517NM = $(CROSS_COMPILE)nm 518OBJCOPY = $(CROSS_COMPILE)objcopy 519OBJDUMP = $(CROSS_COMPILE)objdump 520READELF = $(CROSS_COMPILE)readelf 521STRIP = $(CROSS_COMPILE)strip 522endif 523RUSTC = rustc 524RUSTDOC = rustdoc 525RUSTFMT = rustfmt 526CLIPPY_DRIVER = clippy-driver 527BINDGEN = bindgen 528PAHOLE = pahole 529RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 530LEX = flex 531YACC = bison 532AWK = awk 533INSTALLKERNEL := installkernel 534PERL = perl 535PYTHON3 = python3 536CHECK = sparse 537BASH = bash 538KGZIP = gzip 539KBZIP2 = bzip2 540KLZOP = lzop 541LZMA = lzma 542LZ4 = lz4 543XZ = xz 544ZSTD = zstd 545 546CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 547 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 548NOSTDINC_FLAGS := 549CFLAGS_MODULE = 550RUSTFLAGS_MODULE = 551AFLAGS_MODULE = 552LDFLAGS_MODULE = 553CFLAGS_KERNEL = 554RUSTFLAGS_KERNEL = 555AFLAGS_KERNEL = 556LDFLAGS_vmlinux = 557 558# Use USERINCLUDE when you must reference the UAPI directories only. 559USERINCLUDE := \ 560 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 561 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 562 -I$(srctree)/include/uapi \ 563 -I$(objtree)/include/generated/uapi \ 564 -include $(srctree)/include/linux/compiler-version.h \ 565 -include $(srctree)/include/linux/kconfig.h 566 567# Use LINUXINCLUDE when you must reference the include/ directory. 568# Needed to be compatible with the O= option 569LINUXINCLUDE := \ 570 -I$(srctree)/arch/$(SRCARCH)/include \ 571 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 572 -I$(srctree)/include \ 573 -I$(objtree)/include \ 574 $(USERINCLUDE) 575 576KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 577 578KBUILD_CFLAGS := 579KBUILD_CFLAGS += -std=gnu11 580KBUILD_CFLAGS += -fshort-wchar 581KBUILD_CFLAGS += -funsigned-char 582KBUILD_CFLAGS += -fno-common 583KBUILD_CFLAGS += -fno-PIE 584KBUILD_CFLAGS += -fno-strict-aliasing 585 586KBUILD_CPPFLAGS := -D__KERNEL__ 587KBUILD_RUSTFLAGS := $(rust_common_flags) \ 588 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 589 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 590 -Csymbol-mangling-version=v0 \ 591 -Crelocation-model=static \ 592 -Zfunction-sections=n \ 593 -Wclippy::float_arithmetic 594 595KBUILD_AFLAGS_KERNEL := 596KBUILD_CFLAGS_KERNEL := 597KBUILD_RUSTFLAGS_KERNEL := 598KBUILD_AFLAGS_MODULE := -DMODULE 599KBUILD_CFLAGS_MODULE := -DMODULE 600KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 601KBUILD_LDFLAGS_MODULE := 602KBUILD_LDFLAGS := 603CLANG_FLAGS := 604 605ifeq ($(KBUILD_CLIPPY),1) 606 RUSTC_OR_CLIPPY_QUIET := CLIPPY 607 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 608else 609 RUSTC_OR_CLIPPY_QUIET := RUSTC 610 RUSTC_OR_CLIPPY = $(RUSTC) 611endif 612 613# Allows the usage of unstable features in stable compilers. 614export RUSTC_BOOTSTRAP := 1 615 616# Allows finding `.clippy.toml` in out-of-srctree builds. 617export CLIPPY_CONF_DIR := $(srctree) 618 619export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 620export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 621export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 622export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 623export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 624export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 625export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 626export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 627 628export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 629export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 630export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 631export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 632export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 633export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 634 635# Files to ignore in find ... statements 636 637export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 638 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 639 -prune -o 640 641# =========================================================================== 642# Rules shared between *config targets and build targets 643 644# Basic helpers built in scripts/basic/ 645PHONY += scripts_basic 646scripts_basic: 647 $(Q)$(MAKE) $(build)=scripts/basic 648 649PHONY += outputmakefile 650ifdef building_out_of_srctree 651# Before starting out-of-tree build, make sure the source tree is clean. 652# outputmakefile generates a Makefile in the output directory, if using a 653# separate output directory. This allows convenient use of make in the 654# output directory. 655# At the same time when output Makefile generated, generate .gitignore to 656# ignore whole output directory 657 658ifdef KBUILD_EXTMOD 659print_env_for_makefile = \ 660 echo "export KBUILD_OUTPUT = $(objtree)"; \ 661 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 662 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 663else 664print_env_for_makefile = \ 665 echo "export KBUILD_OUTPUT = $(CURDIR)" 666endif 667 668quiet_cmd_makefile = GEN Makefile 669 cmd_makefile = { \ 670 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 671 $(print_env_for_makefile); \ 672 echo "include $(abs_srctree)/Makefile"; \ 673 } > Makefile 674 675outputmakefile: 676ifeq ($(KBUILD_EXTMOD),) 677 @if [ -f $(srctree)/.config -o \ 678 -d $(srctree)/include/config -o \ 679 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 680 echo >&2 "***"; \ 681 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 682 echo >&2 "*** in $(abs_srctree)";\ 683 echo >&2 "***"; \ 684 false; \ 685 fi 686else 687 @if [ -f $(srcroot)/modules.order ]; then \ 688 echo >&2 "***"; \ 689 echo >&2 "*** The external module source tree is not clean."; \ 690 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 691 echo >&2 "***"; \ 692 false; \ 693 fi 694endif 695 $(Q)ln -fsn $(srcroot) source 696 $(call cmd,makefile) 697 $(Q)test -e .gitignore || \ 698 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 699endif 700 701# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 702# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 703# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 704# need export), and from include/config/auto.conf.cmd to detect the compiler 705# upgrade. 706CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 707RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 708 709ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 710include $(srctree)/scripts/Makefile.clang 711endif 712 713# Include this also for config targets because some architectures need 714# cc-cross-prefix to determine CROSS_COMPILE. 715ifdef need-compiler 716include $(srctree)/scripts/Makefile.compiler 717endif 718 719ifdef config-build 720# =========================================================================== 721# *config targets only - make sure prerequisites are updated, and descend 722# in scripts/kconfig to make the *config target 723 724# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 725# KBUILD_DEFCONFIG may point out an alternative default configuration 726# used for 'make defconfig' 727include $(srctree)/arch/$(SRCARCH)/Makefile 728export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 729 730config: outputmakefile scripts_basic FORCE 731 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 732 733%config: outputmakefile scripts_basic FORCE 734 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 735 736else #!config-build 737# =========================================================================== 738# Build targets only - this includes vmlinux, arch-specific targets, clean 739# targets and others. In general all targets except *config targets. 740 741# If building an external module we do not care about the all: rule 742# but instead __all depend on modules 743PHONY += all 744ifeq ($(KBUILD_EXTMOD),) 745__all: all 746else 747__all: modules 748endif 749 750targets := 751 752# Decide whether to build built-in, modular, or both. 753# Normally, just do built-in. 754 755KBUILD_MODULES := 756KBUILD_BUILTIN := 1 757 758# If we have only "make modules", don't compile built-in objects. 759ifeq ($(MAKECMDGOALS),modules) 760 KBUILD_BUILTIN := 761endif 762 763# If we have "make <whatever> modules", compile modules 764# in addition to whatever we do anyway. 765# Just "make" or "make all" shall build modules as well 766 767ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 768 KBUILD_MODULES := 1 769endif 770 771ifeq ($(MAKECMDGOALS),) 772 KBUILD_MODULES := 1 773endif 774 775export KBUILD_MODULES KBUILD_BUILTIN 776 777ifdef need-config 778include $(objtree)/include/config/auto.conf 779endif 780 781ifeq ($(KBUILD_EXTMOD),) 782# Objects we will link into vmlinux / subdirs we need to visit 783core-y := 784drivers-y := 785libs-y := lib/ 786endif # KBUILD_EXTMOD 787 788# The all: target is the default when no target is given on the 789# command line. 790# This allow a user to issue only 'make' to build a kernel including modules 791# Defaults to vmlinux, but the arch makefile usually adds further targets 792all: vmlinux 793 794CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 795ifdef CONFIG_CC_IS_GCC 796CFLAGS_GCOV += -fno-tree-loop-im 797endif 798export CFLAGS_GCOV 799 800# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 801ifdef CONFIG_FUNCTION_TRACER 802 CC_FLAGS_FTRACE := -pg 803endif 804 805include $(srctree)/arch/$(SRCARCH)/Makefile 806 807ifdef need-config 808ifdef may-sync-config 809# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 810# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 811# because some architectures define CROSS_COMPILE there. 812include include/config/auto.conf.cmd 813 814$(KCONFIG_CONFIG): 815 @echo >&2 '***' 816 @echo >&2 '*** Configuration file "$@" not found!' 817 @echo >&2 '***' 818 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 819 @echo >&2 '*** "make menuconfig" or "make xconfig").' 820 @echo >&2 '***' 821 @/bin/false 822 823# The actual configuration files used during the build are stored in 824# include/generated/ and include/config/. Update them if .config is newer than 825# include/config/auto.conf (which mirrors .config). 826# 827# This exploits the 'multi-target pattern rule' trick. 828# The syncconfig should be executed only once to make all the targets. 829# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 830# 831# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 832# so you cannot notice that Kconfig is waiting for the user input. 833%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 834 $(Q)$(kecho) " SYNC $@" 835 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 836else # !may-sync-config 837# External modules and some install targets need include/generated/autoconf.h 838# and include/config/auto.conf but do not care if they are up-to-date. 839# Use auto.conf to show the error message 840 841checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 842missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 843 844ifdef missing-configs 845PHONY += $(objtree)/include/config/auto.conf 846 847$(objtree)/include/config/auto.conf: 848 @echo >&2 '***' 849 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 850 @printf >&2 '*** - %s\n' $(missing-configs) 851 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 852 @echo >&2 '***' 853 @/bin/false 854endif 855 856endif # may-sync-config 857endif # need-config 858 859KBUILD_CFLAGS += -fno-delete-null-pointer-checks 860 861ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 862KBUILD_CFLAGS += -O2 863KBUILD_RUSTFLAGS += -Copt-level=2 864else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 865KBUILD_CFLAGS += -Os 866KBUILD_RUSTFLAGS += -Copt-level=s 867endif 868 869# Always set `debug-assertions` and `overflow-checks` because their default 870# depends on `opt-level` and `debug-assertions`, respectively. 871KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 872KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 873 874# Tell gcc to never replace conditional load with a non-conditional one 875ifdef CONFIG_CC_IS_GCC 876# gcc-10 renamed --param=allow-store-data-races=0 to 877# -fno-allow-store-data-races. 878KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 879KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 880endif 881 882ifdef CONFIG_READABLE_ASM 883# Disable optimizations that make assembler listings hard to read. 884# reorder blocks reorders the control in the function 885# ipa clone creates specialized cloned functions 886# partial inlining inlines only parts of functions 887KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 888endif 889 890stackp-flags-y := -fno-stack-protector 891stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 892stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 893 894KBUILD_CFLAGS += $(stackp-flags-y) 895 896KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 897KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 898 899ifdef CONFIG_FRAME_POINTER 900KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 901KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 902else 903# Some targets (ARM with Thumb2, for example), can't be built with frame 904# pointers. For those, we don't have FUNCTION_TRACER automatically 905# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 906# incompatible with -fomit-frame-pointer with current GCC, so we don't use 907# -fomit-frame-pointer with FUNCTION_TRACER. 908# In the Rust target specification, "frame-pointer" is set explicitly 909# to "may-omit". 910ifndef CONFIG_FUNCTION_TRACER 911KBUILD_CFLAGS += -fomit-frame-pointer 912endif 913endif 914 915# Initialize all stack variables with a 0xAA pattern. 916ifdef CONFIG_INIT_STACK_ALL_PATTERN 917KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 918endif 919 920# Initialize all stack variables with a zero value. 921ifdef CONFIG_INIT_STACK_ALL_ZERO 922KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 923ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 924# https://github.com/llvm/llvm-project/issues/44842 925CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 926export CC_AUTO_VAR_INIT_ZERO_ENABLER 927KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 928endif 929endif 930 931# While VLAs have been removed, GCC produces unreachable stack probes 932# for the randomize_kstack_offset feature. Disable it for all compilers. 933KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 934 935# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 936ifdef CONFIG_ZERO_CALL_USED_REGS 937KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 938endif 939 940ifdef CONFIG_FUNCTION_TRACER 941ifdef CONFIG_FTRACE_MCOUNT_USE_CC 942 CC_FLAGS_FTRACE += -mrecord-mcount 943 ifdef CONFIG_HAVE_NOP_MCOUNT 944 ifeq ($(call cc-option-yn, -mnop-mcount),y) 945 CC_FLAGS_FTRACE += -mnop-mcount 946 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 947 endif 948 endif 949endif 950ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 951 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 952 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 953 endif 954endif 955ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 956 ifdef CONFIG_HAVE_C_RECORDMCOUNT 957 BUILD_C_RECORDMCOUNT := y 958 export BUILD_C_RECORDMCOUNT 959 endif 960endif 961ifdef CONFIG_HAVE_FENTRY 962 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 963 ifeq ($(call cc-option-yn, -mfentry),y) 964 CC_FLAGS_FTRACE += -mfentry 965 CC_FLAGS_USING += -DCC_USING_FENTRY 966 endif 967endif 968export CC_FLAGS_FTRACE 969KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 970KBUILD_AFLAGS += $(CC_FLAGS_USING) 971endif 972 973# We trigger additional mismatches with less inlining 974ifdef CONFIG_DEBUG_SECTION_MISMATCH 975KBUILD_CFLAGS += -fno-inline-functions-called-once 976endif 977 978# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 979ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 980KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 981KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 982LDFLAGS_vmlinux += --gc-sections 983endif 984 985ifdef CONFIG_SHADOW_CALL_STACK 986ifndef CONFIG_DYNAMIC_SCS 987CC_FLAGS_SCS := -fsanitize=shadow-call-stack 988KBUILD_CFLAGS += $(CC_FLAGS_SCS) 989KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 990endif 991export CC_FLAGS_SCS 992endif 993 994ifdef CONFIG_LTO_CLANG 995ifdef CONFIG_LTO_CLANG_THIN 996CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 997else 998CC_FLAGS_LTO := -flto 999endif 1000CC_FLAGS_LTO += -fvisibility=hidden 1001 1002# Limit inlining across translation units to reduce binary size 1003KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1004endif 1005 1006ifdef CONFIG_LTO 1007KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1008KBUILD_AFLAGS += -fno-lto 1009export CC_FLAGS_LTO 1010endif 1011 1012ifdef CONFIG_CFI_CLANG 1013CC_FLAGS_CFI := -fsanitize=kcfi 1014ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1015 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1016endif 1017ifdef CONFIG_RUST 1018 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1019 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1020 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1021 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1022 export RUSTC_FLAGS_CFI 1023endif 1024KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1025export CC_FLAGS_CFI 1026endif 1027 1028# Architectures can define flags to add/remove for floating-point support 1029CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1030export CC_FLAGS_FPU 1031export CC_FLAGS_NO_FPU 1032 1033ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1034# Set the minimal function alignment. Use the newer GCC option 1035# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1036# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1037ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1038KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1039else 1040KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1041endif 1042endif 1043 1044# arch Makefile may override CC so keep this after arch Makefile is included 1045NOSTDINC_FLAGS += -nostdinc 1046 1047# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1048# the kernel uses only C99 flexible arrays for dynamically sized trailing 1049# arrays. Enforce this for everything that may examine structure sizes and 1050# perform bounds checking. 1051KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1052 1053#Currently, disable -Wstringop-overflow for GCC 11, globally. 1054KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1055KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1056 1057# disable invalid "can't wrap" optimizations for signed / pointers 1058KBUILD_CFLAGS += -fno-strict-overflow 1059 1060# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1061KBUILD_CFLAGS += -fno-stack-check 1062 1063# conserve stack if available 1064ifdef CONFIG_CC_IS_GCC 1065KBUILD_CFLAGS += -fconserve-stack 1066endif 1067 1068# change __FILE__ to the relative path to the source directory 1069ifdef building_out_of_srctree 1070KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=) 1071endif 1072 1073# include additional Makefiles when needed 1074include-y := scripts/Makefile.extrawarn 1075include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1076include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1077include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1078include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1079include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1080include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1081include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1082include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1083include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1084include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1085include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1086 1087include $(addprefix $(srctree)/, $(include-y)) 1088 1089# scripts/Makefile.gcc-plugins is intentionally included last. 1090# Do not add $(call cc-option,...) below this line. When you build the kernel 1091# from the clean source tree, the GCC plugins do not exist at this point. 1092 1093# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1094KBUILD_CPPFLAGS += $(KCPPFLAGS) 1095KBUILD_AFLAGS += $(KAFLAGS) 1096KBUILD_CFLAGS += $(KCFLAGS) 1097KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1098 1099KBUILD_LDFLAGS_MODULE += --build-id=sha1 1100LDFLAGS_vmlinux += --build-id=sha1 1101 1102KBUILD_LDFLAGS += -z noexecstack 1103ifeq ($(CONFIG_LD_IS_BFD),y) 1104KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1105endif 1106 1107ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1108LDFLAGS_vmlinux += -X 1109endif 1110 1111ifeq ($(CONFIG_RELR),y) 1112# ld.lld before 15 did not support -z pack-relative-relocs. 1113LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1114endif 1115 1116# We never want expected sections to be placed heuristically by the 1117# linker. All sections should be explicitly named in the linker script. 1118ifdef CONFIG_LD_ORPHAN_WARN 1119LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1120endif 1121 1122# Align the bit size of userspace programs with the kernel 1123KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1124KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1125 1126# make the checker run with the right architecture 1127CHECKFLAGS += --arch=$(ARCH) 1128 1129# insure the checker run with the right endianness 1130CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1131 1132# the checker needs the correct machine size 1133CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1134 1135# Default kernel image to build when no specific target is given. 1136# KBUILD_IMAGE may be overruled on the command line or 1137# set in the environment 1138# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1139# this default value 1140export KBUILD_IMAGE ?= vmlinux 1141 1142# 1143# INSTALL_PATH specifies where to place the updated kernel and system map 1144# images. Default is /boot, but you can set it to other values 1145export INSTALL_PATH ?= /boot 1146 1147# 1148# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1149# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1150# an argument if needed. Otherwise it defaults to the kernel install path 1151# 1152export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1153 1154# 1155# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1156# relocations required by build roots. This is not defined in the 1157# makefile but the argument can be passed to make if needed. 1158# 1159 1160MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1161export MODLIB 1162 1163PHONY += prepare0 1164 1165ifeq ($(KBUILD_EXTMOD),) 1166 1167build-dir := . 1168clean-dirs := $(sort . Documentation \ 1169 $(patsubst %/,%,$(filter %/, $(core-) \ 1170 $(drivers-) $(libs-)))) 1171 1172export ARCH_CORE := $(core-y) 1173export ARCH_LIB := $(filter %/, $(libs-y)) 1174export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1175# Externally visible symbols (used by link-vmlinux.sh) 1176 1177KBUILD_VMLINUX_OBJS := ./built-in.a 1178ifdef CONFIG_MODULES 1179KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1180KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1181else 1182KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1183endif 1184 1185export KBUILD_VMLINUX_LIBS 1186export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1187 1188ifdef CONFIG_TRIM_UNUSED_KSYMS 1189# For the kernel to actually contain only the needed exported symbols, 1190# we have to build modules as well to determine what those symbols are. 1191KBUILD_MODULES := 1 1192endif 1193 1194# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1195quiet_cmd_ar_vmlinux.a = AR $@ 1196 cmd_ar_vmlinux.a = \ 1197 rm -f $@; \ 1198 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1199 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1200 1201targets += vmlinux.a 1202vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1203 $(call if_changed,ar_vmlinux.a) 1204 1205PHONY += vmlinux_o 1206vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1207 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1208 1209vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1210 @: 1211 1212PHONY += vmlinux 1213# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1214# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1215# unrelated; the decompressors just happen to have the same base name, 1216# arch/*/boot/compressed/vmlinux. 1217# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1218# 1219# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1220# https://savannah.gnu.org/bugs/?61463 1221# For Make > 4.4, the following simple code will work: 1222# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1223vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1224vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1225vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1226 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1227 1228# The actual objects are generated when descending, 1229# make sure no implicit rule kicks in 1230$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1231 1232ifeq ($(origin KERNELRELEASE),file) 1233filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1234else 1235filechk_kernel.release = echo $(KERNELRELEASE) 1236endif 1237 1238# Store (new) KERNELRELEASE string in include/config/kernel.release 1239include/config/kernel.release: FORCE 1240 $(call filechk,kernel.release) 1241 1242# Additional helpers built in scripts/ 1243# Carefully list dependencies so we do not try to build scripts twice 1244# in parallel 1245PHONY += scripts 1246scripts: scripts_basic scripts_dtc 1247 $(Q)$(MAKE) $(build)=$(@) 1248 1249# Things we need to do before we recursively start building the kernel 1250# or the modules are listed in "prepare". 1251# A multi level approach is used. prepareN is processed before prepareN-1. 1252# archprepare is used in arch Makefiles and when processed asm symlink, 1253# version.h and scripts_basic is processed / created. 1254 1255PHONY += prepare archprepare 1256 1257archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1258 asm-generic $(version_h) include/generated/utsrelease.h \ 1259 include/generated/compile.h include/generated/autoconf.h \ 1260 include/generated/rustc_cfg remove-stale-files 1261 1262prepare0: archprepare 1263 $(Q)$(MAKE) $(build)=scripts/mod 1264 $(Q)$(MAKE) $(build)=. prepare 1265 1266# All the preparing.. 1267prepare: prepare0 1268ifdef CONFIG_RUST 1269 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1270 $(Q)$(MAKE) $(build)=rust 1271endif 1272 1273PHONY += remove-stale-files 1274remove-stale-files: 1275 $(Q)$(srctree)/scripts/remove-stale-files 1276 1277# Support for using generic headers in asm-generic 1278asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1279 1280PHONY += asm-generic uapi-asm-generic 1281asm-generic: uapi-asm-generic 1282 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1283 generic=include/asm-generic 1284uapi-asm-generic: 1285 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1286 generic=include/uapi/asm-generic 1287 1288# Generate some files 1289# --------------------------------------------------------------------------- 1290 1291# KERNELRELEASE can change from a few different places, meaning version.h 1292# needs to be updated, so this check is forced on all builds 1293 1294uts_len := 64 1295define filechk_utsrelease.h 1296 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1297 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1298 exit 1; \ 1299 fi; \ 1300 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1301endef 1302 1303define filechk_version.h 1304 if [ $(SUBLEVEL) -gt 255 ]; then \ 1305 echo \#define LINUX_VERSION_CODE $(shell \ 1306 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1307 else \ 1308 echo \#define LINUX_VERSION_CODE $(shell \ 1309 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1310 fi; \ 1311 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1312 ((c) > 255 ? 255 : (c)))'; \ 1313 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1314 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1315 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1316endef 1317 1318$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1319$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1320$(version_h): FORCE 1321 $(call filechk,version.h) 1322 1323include/generated/utsrelease.h: include/config/kernel.release FORCE 1324 $(call filechk,utsrelease.h) 1325 1326filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1327 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1328 1329include/generated/compile.h: FORCE 1330 $(call filechk,compile.h) 1331 1332PHONY += headerdep 1333headerdep: 1334 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1335 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1336 1337# --------------------------------------------------------------------------- 1338# Kernel headers 1339 1340#Default location for installed headers 1341export INSTALL_HDR_PATH = $(objtree)/usr 1342 1343quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1344 cmd_headers_install = \ 1345 mkdir -p $(INSTALL_HDR_PATH); \ 1346 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1347 usr/include $(INSTALL_HDR_PATH) 1348 1349PHONY += headers_install 1350headers_install: headers 1351 $(call cmd,headers_install) 1352 1353PHONY += archheaders archscripts 1354 1355hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1356 1357PHONY += headers 1358headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1359 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1360 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1361 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1362 1363ifdef CONFIG_HEADERS_INSTALL 1364prepare: headers 1365endif 1366 1367PHONY += scripts_unifdef 1368scripts_unifdef: scripts_basic 1369 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1370 1371PHONY += scripts_gen_packed_field_checks 1372scripts_gen_packed_field_checks: scripts_basic 1373 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1374 1375# --------------------------------------------------------------------------- 1376# Install 1377 1378# Many distributions have the custom install script, /sbin/installkernel. 1379# If DKMS is installed, 'make install' will eventually recurse back 1380# to this Makefile to build and install external modules. 1381# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1382 1383quiet_cmd_install = INSTALL $(INSTALL_PATH) 1384 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1385 1386# --------------------------------------------------------------------------- 1387# vDSO install 1388 1389PHONY += vdso_install 1390vdso_install: export INSTALL_FILES = $(vdso-install-y) 1391vdso_install: 1392 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1393 1394# --------------------------------------------------------------------------- 1395# Tools 1396 1397ifdef CONFIG_OBJTOOL 1398prepare: tools/objtool 1399endif 1400 1401ifdef CONFIG_BPF 1402ifdef CONFIG_DEBUG_INFO_BTF 1403prepare: tools/bpf/resolve_btfids 1404endif 1405endif 1406 1407# The tools build system is not a part of Kbuild and tends to introduce 1408# its own unique issues. If you need to integrate a new tool into Kbuild, 1409# please consider locating that tool outside the tools/ tree and using the 1410# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1411# here. See Documentation/kbuild/makefiles.rst for details. 1412 1413PHONY += resolve_btfids_clean 1414 1415resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1416 1417# tools/bpf/resolve_btfids directory might not exist 1418# in output directory, skip its clean in that case 1419resolve_btfids_clean: 1420ifneq ($(wildcard $(resolve_btfids_O)),) 1421 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1422endif 1423 1424tools/: FORCE 1425 $(Q)mkdir -p $(objtree)/tools 1426 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1427 1428tools/%: FORCE 1429 $(Q)mkdir -p $(objtree)/tools 1430 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1431 1432# --------------------------------------------------------------------------- 1433# Kernel selftest 1434 1435PHONY += kselftest 1436kselftest: headers 1437 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1438 1439kselftest-%: headers FORCE 1440 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1441 1442PHONY += kselftest-merge 1443kselftest-merge: 1444 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1445 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1446 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1447 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1448 1449# --------------------------------------------------------------------------- 1450# Devicetree files 1451 1452ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1453dtstree := arch/$(SRCARCH)/boot/dts 1454endif 1455 1456ifneq ($(dtstree),) 1457 1458%.dtb: dtbs_prepare 1459 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1460 1461%.dtbo: dtbs_prepare 1462 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1463 1464PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1465dtbs: dtbs_prepare 1466 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1467 1468# include/config/kernel.release is actually needed when installing DTBs because 1469# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1470# dtbs_install depend on it as dtbs_install may run as root. 1471dtbs_prepare: include/config/kernel.release scripts_dtc 1472 1473ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1474export CHECK_DTBS=y 1475endif 1476 1477ifneq ($(CHECK_DTBS),) 1478dtbs_prepare: dt_binding_schemas 1479endif 1480 1481dtbs_check: dtbs 1482 1483dtbs_install: 1484 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1485 1486ifdef CONFIG_OF_EARLY_FLATTREE 1487all: dtbs 1488endif 1489 1490ifdef CONFIG_GENERIC_BUILTIN_DTB 1491vmlinux: dtbs 1492endif 1493 1494endif 1495 1496PHONY += scripts_dtc 1497scripts_dtc: scripts_basic 1498 $(Q)$(MAKE) $(build)=scripts/dtc 1499 1500ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1501export CHECK_DTBS=y 1502endif 1503 1504PHONY += dt_binding_check dt_binding_schemas 1505dt_binding_check: dt_binding_schemas scripts_dtc 1506 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1507 1508dt_binding_schemas: 1509 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1510 1511PHONY += dt_compatible_check 1512dt_compatible_check: dt_binding_schemas 1513 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1514 1515# --------------------------------------------------------------------------- 1516# Modules 1517 1518ifdef CONFIG_MODULES 1519 1520# By default, build modules as well 1521 1522all: modules 1523 1524# When we're building modules with modversions, we need to consider 1525# the built-in objects during the descend as well, in order to 1526# make sure the checksums are up to date before we record them. 1527ifdef CONFIG_MODVERSIONS 1528 KBUILD_BUILTIN := 1 1529endif 1530 1531# Build modules 1532# 1533 1534# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1535# is an exception. 1536ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1537KBUILD_BUILTIN := 1 1538modules: vmlinux 1539endif 1540 1541modules: modules_prepare 1542 1543# Target to prepare building external modules 1544modules_prepare: prepare 1545 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1546 1547endif # CONFIG_MODULES 1548 1549### 1550# Cleaning is done on three levels. 1551# make clean Delete most generated files 1552# Leave enough to build external modules 1553# make mrproper Delete the current configuration, and all generated files 1554# make distclean Remove editor backup files, patch leftover files and the like 1555 1556# Directories & files removed with 'make clean' 1557CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1558 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1559 modules.builtin.ranges vmlinux.o.map \ 1560 compile_commands.json rust/test \ 1561 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1562 .builtin-dtbs-list .builtin-dtb.S 1563 1564# Directories & files removed with 'make mrproper' 1565MRPROPER_FILES += include/config include/generated \ 1566 arch/$(SRCARCH)/include/generated .objdiff \ 1567 debian snap tar-install PKGBUILD pacman \ 1568 .config .config.old .version \ 1569 Module.symvers \ 1570 certs/signing_key.pem \ 1571 certs/x509.genkey \ 1572 vmlinux-gdb.py \ 1573 rpmbuild \ 1574 rust/libmacros.so rust/libmacros.dylib 1575 1576# clean - Delete most, but leave enough to build external modules 1577# 1578clean: private rm-files := $(CLEAN_FILES) 1579 1580PHONY += archclean vmlinuxclean 1581 1582vmlinuxclean: 1583 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1584 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1585 1586clean: archclean vmlinuxclean resolve_btfids_clean 1587 1588# mrproper - Delete all generated files, including .config 1589# 1590mrproper: private rm-files := $(MRPROPER_FILES) 1591mrproper-dirs := $(addprefix _mrproper_,scripts) 1592 1593PHONY += $(mrproper-dirs) mrproper 1594$(mrproper-dirs): 1595 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1596 1597mrproper: clean $(mrproper-dirs) 1598 $(call cmd,rmfiles) 1599 @find . $(RCS_FIND_IGNORE) \ 1600 \( -name '*.rmeta' \) \ 1601 -type f -print | xargs rm -f 1602 1603# distclean 1604# 1605PHONY += distclean 1606 1607distclean: mrproper 1608 @find . $(RCS_FIND_IGNORE) \ 1609 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1610 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1611 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1612 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1613 -type f -print | xargs rm -f 1614 1615 1616# Packaging of the kernel to various formats 1617# --------------------------------------------------------------------------- 1618 1619%src-pkg: FORCE 1620 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1621%pkg: include/config/kernel.release FORCE 1622 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1623 1624# Brief documentation of the typical targets used 1625# --------------------------------------------------------------------------- 1626 1627boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1628boards := $(sort $(notdir $(boards))) 1629board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1630board-dirs := $(sort $(notdir $(board-dirs:/=))) 1631 1632PHONY += help 1633help: 1634 @echo 'Cleaning targets:' 1635 @echo ' clean - Remove most generated files but keep the config and' 1636 @echo ' enough build support to build external modules' 1637 @echo ' mrproper - Remove all generated files + config + various backup files' 1638 @echo ' distclean - mrproper + remove editor backup and patch files' 1639 @echo '' 1640 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1641 @echo '' 1642 @echo 'Other generic targets:' 1643 @echo ' all - Build all targets marked with [*]' 1644 @echo '* vmlinux - Build the bare kernel' 1645 @echo '* modules - Build all modules' 1646 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1647 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1648 @echo ' dir/ - Build all files in dir and below' 1649 @echo ' dir/file.[ois] - Build specified target only' 1650 @echo ' dir/file.ll - Build the LLVM assembly file' 1651 @echo ' (requires compiler support for LLVM assembly generation)' 1652 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1653 @echo ' (requires a recent binutils and recent build (System.map))' 1654 @echo ' dir/file.ko - Build module including final link' 1655 @echo ' modules_prepare - Set up for building external modules' 1656 @echo ' tags/TAGS - Generate tags file for editors' 1657 @echo ' cscope - Generate cscope index' 1658 @echo ' gtags - Generate GNU GLOBAL index' 1659 @echo ' kernelrelease - Output the release version string (use with make -s)' 1660 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1661 @echo ' image_name - Output the image name (use with make -s)' 1662 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1663 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1664 echo '' 1665 @echo 'Static analysers:' 1666 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1667 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1668 @echo ' versioncheck - Sanity check on version.h usage' 1669 @echo ' includecheck - Check for duplicate included header files' 1670 @echo ' headerdep - Detect inclusion cycles in headers' 1671 @echo ' coccicheck - Check with Coccinelle' 1672 @echo ' clang-analyzer - Check with clang static analyzer' 1673 @echo ' clang-tidy - Check with clang-tidy' 1674 @echo '' 1675 @echo 'Tools:' 1676 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1677 @echo '' 1678 @echo 'Kernel selftest:' 1679 @echo ' kselftest - Build and run kernel selftest' 1680 @echo ' Build, install, and boot kernel before' 1681 @echo ' running kselftest on it' 1682 @echo ' Run as root for full coverage' 1683 @echo ' kselftest-all - Build kernel selftest' 1684 @echo ' kselftest-install - Build and install kernel selftest' 1685 @echo ' kselftest-clean - Remove all generated kselftest files' 1686 @echo ' kselftest-merge - Merge all the config dependencies of' 1687 @echo ' kselftest to existing .config.' 1688 @echo '' 1689 @echo 'Rust targets:' 1690 @echo ' rustavailable - Checks whether the Rust toolchain is' 1691 @echo ' available and, if not, explains why.' 1692 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1693 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1694 @echo ' is formatted, printing a diff otherwise.' 1695 @echo ' rustdoc - Generate Rust documentation' 1696 @echo ' (requires kernel .config)' 1697 @echo ' rusttest - Runs the Rust tests' 1698 @echo ' (requires kernel .config; downloads external repos)' 1699 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1700 @echo ' (requires kernel .config)' 1701 @echo ' dir/file.[os] - Build specified target only' 1702 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1703 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1704 @echo ' The output is not intended to be compilable.' 1705 @echo ' dir/file.ll - Build the LLVM assembly file' 1706 @echo '' 1707 @$(if $(dtstree), \ 1708 echo 'Devicetree:'; \ 1709 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1710 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1711 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1712 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1713 echo ' dtbs_check - Validate device tree source files';\ 1714 echo '') 1715 1716 @echo 'Userspace tools targets:' 1717 @echo ' use "make tools/help"' 1718 @echo ' or "cd tools; make help"' 1719 @echo '' 1720 @echo 'Kernel packaging:' 1721 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1722 @echo '' 1723 @echo 'Documentation targets:' 1724 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1725 @echo '' 1726 @echo 'Architecture-specific targets ($(SRCARCH)):' 1727 @$(or $(archhelp),\ 1728 echo ' No architecture-specific help defined for $(SRCARCH)') 1729 @echo '' 1730 @$(if $(boards), \ 1731 $(foreach b, $(boards), \ 1732 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1733 echo '') 1734 @$(if $(board-dirs), \ 1735 $(foreach b, $(board-dirs), \ 1736 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1737 printf " %-16s - Show all of the above\\n" help-boards; \ 1738 echo '') 1739 1740 @echo ' make V=n [targets] 1: verbose build' 1741 @echo ' 2: give reason for rebuild of target' 1742 @echo ' V=1 and V=2 can be combined with V=12' 1743 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1744 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1745 @echo ' (sparse by default)' 1746 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1747 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1748 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1749 @echo ' 1: warnings which may be relevant and do not occur too often' 1750 @echo ' 2: warnings which occur quite often but may still be relevant' 1751 @echo ' 3: more obscure warnings, can most likely be ignored' 1752 @echo ' c: extra checks in the configuration stage (Kconfig)' 1753 @echo ' e: warnings are being treated as errors' 1754 @echo ' Multiple levels can be combined with W=12 or W=123' 1755 @$(if $(dtstree), \ 1756 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1757 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1758 ) 1759 @echo '' 1760 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1761 @echo 'For further info see the ./README file' 1762 1763 1764help-board-dirs := $(addprefix help-,$(board-dirs)) 1765 1766help-boards: $(help-board-dirs) 1767 1768boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1769 1770$(help-board-dirs): help-%: 1771 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1772 @$(if $(boards-per-dir), \ 1773 $(foreach b, $(boards-per-dir), \ 1774 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1775 echo '') 1776 1777 1778# Documentation targets 1779# --------------------------------------------------------------------------- 1780DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1781 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1782PHONY += $(DOC_TARGETS) 1783$(DOC_TARGETS): 1784 $(Q)$(MAKE) $(build)=Documentation $@ 1785 1786 1787# Rust targets 1788# --------------------------------------------------------------------------- 1789 1790# "Is Rust available?" target 1791PHONY += rustavailable 1792rustavailable: 1793 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1794 1795# Documentation target 1796# 1797# Using the singular to avoid running afoul of `no-dot-config-targets`. 1798PHONY += rustdoc 1799rustdoc: prepare 1800 $(Q)$(MAKE) $(build)=rust $@ 1801 1802# Testing target 1803PHONY += rusttest 1804rusttest: prepare 1805 $(Q)$(MAKE) $(build)=rust $@ 1806 1807# Formatting targets 1808PHONY += rustfmt rustfmtcheck 1809 1810rustfmt: 1811 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1812 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1813 | xargs $(RUSTFMT) $(rustfmt_flags) 1814 1815rustfmtcheck: rustfmt_flags = --check 1816rustfmtcheck: rustfmt 1817 1818# Misc 1819# --------------------------------------------------------------------------- 1820 1821PHONY += misc-check 1822misc-check: 1823 $(Q)$(srctree)/scripts/misc-check 1824 1825all: misc-check 1826 1827PHONY += scripts_gdb 1828scripts_gdb: prepare0 1829 $(Q)$(MAKE) $(build)=scripts/gdb 1830 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1831 1832ifdef CONFIG_GDB_SCRIPTS 1833all: scripts_gdb 1834endif 1835 1836else # KBUILD_EXTMOD 1837 1838filechk_kernel.release = echo $(KERNELRELEASE) 1839 1840### 1841# External module support. 1842# When building external modules the kernel used as basis is considered 1843# read-only, and no consistency checks are made and the make 1844# system is not used on the basis kernel. If updates are required 1845# in the basis kernel ordinary make commands (without M=...) must be used. 1846 1847# We are always building only modules. 1848KBUILD_BUILTIN := 1849KBUILD_MODULES := 1 1850 1851build-dir := . 1852 1853clean-dirs := . 1854clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1855 1856PHONY += prepare 1857# now expand this into a simple variable to reduce the cost of shell evaluations 1858prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1859prepare: 1860 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1861 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1862 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1863 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1864 fi 1865 1866PHONY += help 1867help: 1868 @echo ' Building external modules.' 1869 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1870 @echo '' 1871 @echo ' modules - default target, build the module(s)' 1872 @echo ' modules_install - install the module' 1873 @echo ' clean - remove generated files in module directory only' 1874 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1875 @echo '' 1876 1877ifndef CONFIG_MODULES 1878modules modules_install: __external_modules_error 1879__external_modules_error: 1880 @echo >&2 '***' 1881 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1882 @echo >&2 '*** You cannot build or install external modules.' 1883 @echo >&2 '***' 1884 @false 1885endif 1886 1887endif # KBUILD_EXTMOD 1888 1889# --------------------------------------------------------------------------- 1890# Modules 1891 1892PHONY += modules modules_install modules_sign modules_prepare 1893 1894modules_install: 1895 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1896 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1897 1898ifeq ($(CONFIG_MODULE_SIG),y) 1899# modules_sign is a subset of modules_install. 1900# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1901modules_sign: modules_install 1902 @: 1903else 1904modules_sign: 1905 @echo >&2 '***' 1906 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1907 @echo >&2 '***' 1908 @false 1909endif 1910 1911ifdef CONFIG_MODULES 1912 1913modules.order: $(build-dir) 1914 @: 1915 1916# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1917# This is solely useful to speed up test compiles. 1918modules: modpost 1919ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1920 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1921endif 1922 1923PHONY += modules_check 1924modules_check: modules.order 1925 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1926 1927else # CONFIG_MODULES 1928 1929modules: 1930 @: 1931 1932KBUILD_MODULES := 1933 1934endif # CONFIG_MODULES 1935 1936PHONY += modpost 1937modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1938 $(if $(KBUILD_MODULES), modules_check) 1939 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1940 1941# Single targets 1942# --------------------------------------------------------------------------- 1943# To build individual files in subdirectories, you can do like this: 1944# 1945# make foo/bar/baz.s 1946# 1947# The supported suffixes for single-target are listed in 'single-targets' 1948# 1949# To build only under specific subdirectories, you can do like this: 1950# 1951# make foo/bar/baz/ 1952 1953ifdef single-build 1954 1955# .ko is special because modpost is needed 1956single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1957single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1958 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1959 1960$(single-ko): single_modules 1961 @: 1962$(single-no-ko): $(build-dir) 1963 @: 1964 1965# Remove modules.order when done because it is not the real one. 1966PHONY += single_modules 1967single_modules: $(single-no-ko) modules_prepare 1968 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 1969 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1970ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1971 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1972endif 1973 $(Q)rm -f modules.order 1974 1975single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1976 1977KBUILD_MODULES := 1 1978 1979endif 1980 1981prepare: outputmakefile 1982 1983# Preset locale variables to speed up the build process. Limit locale 1984# tweaks to this spot to avoid wrong language settings when running 1985# make menuconfig etc. 1986# Error messages still appears in the original language 1987PHONY += $(build-dir) 1988$(build-dir): prepare 1989 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1990 1991clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1992PHONY += $(clean-dirs) clean 1993$(clean-dirs): 1994 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1995 1996clean: $(clean-dirs) 1997 $(call cmd,rmfiles) 1998 @find . $(RCS_FIND_IGNORE) \ 1999 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2000 -o -name '*.ko.*' \ 2001 -o -name '*.dtb' -o -name '*.dtbo' \ 2002 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2003 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2004 -o -name '*.dwo' -o -name '*.lst' \ 2005 -o -name '*.su' -o -name '*.mod' \ 2006 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2007 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2008 -o -name '*.asn1.[ch]' \ 2009 -o -name '*.symtypes' -o -name 'modules.order' \ 2010 -o -name '*.c.[012]*.*' \ 2011 -o -name '*.ll' \ 2012 -o -name '*.gcno' \ 2013 \) -type f -print \ 2014 -o -name '.tmp_*' -print \ 2015 | xargs rm -rf 2016 2017# Generate tags for editors 2018# --------------------------------------------------------------------------- 2019quiet_cmd_tags = GEN $@ 2020 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2021 2022tags TAGS cscope gtags: FORCE 2023 $(call cmd,tags) 2024 2025# Generate rust-project.json (a file that describes the structure of non-Cargo 2026# Rust projects) for rust-analyzer (an implementation of the Language Server 2027# Protocol). 2028PHONY += rust-analyzer 2029rust-analyzer: 2030 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2031ifdef KBUILD_EXTMOD 2032# FIXME: external modules must not descend into a sub-directory of the kernel 2033 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2034else 2035 $(Q)$(MAKE) $(build)=rust $@ 2036endif 2037 2038# Script to generate missing namespace dependencies 2039# --------------------------------------------------------------------------- 2040 2041PHONY += nsdeps 2042nsdeps: export KBUILD_NSDEPS=1 2043nsdeps: modules 2044 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2045 2046# Clang Tooling 2047# --------------------------------------------------------------------------- 2048 2049quiet_cmd_gen_compile_commands = GEN $@ 2050 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2051 2052compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2053 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2054 $(if $(CONFIG_MODULES), modules.order) FORCE 2055 $(call if_changed,gen_compile_commands) 2056 2057targets += compile_commands.json 2058 2059PHONY += clang-tidy clang-analyzer 2060 2061ifdef CONFIG_CC_IS_CLANG 2062quiet_cmd_clang_tools = CHECK $< 2063 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2064 2065clang-tidy clang-analyzer: compile_commands.json 2066 $(call cmd,clang_tools) 2067else 2068clang-tidy clang-analyzer: 2069 @echo "$@ requires CC=clang" >&2 2070 @false 2071endif 2072 2073# Scripts to check various things for consistency 2074# --------------------------------------------------------------------------- 2075 2076PHONY += includecheck versioncheck coccicheck 2077 2078includecheck: 2079 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2080 -name '*.[hcS]' -type f -print | sort \ 2081 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2082 2083versioncheck: 2084 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2085 -name '*.[hcS]' -type f -print | sort \ 2086 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2087 2088coccicheck: 2089 $(Q)$(BASH) $(srctree)/scripts/$@ 2090 2091PHONY += checkstack kernelrelease kernelversion image_name 2092 2093# UML needs a little special treatment here. It wants to use the host 2094# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2095# else wants $(ARCH), including people doing cross-builds, which means 2096# that $(SUBARCH) doesn't work here. 2097ifeq ($(ARCH), um) 2098CHECKSTACK_ARCH := $(SUBARCH) 2099else 2100CHECKSTACK_ARCH := $(ARCH) 2101endif 2102MINSTACKSIZE ?= 100 2103checkstack: 2104 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2105 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2106 2107kernelrelease: 2108 @$(filechk_kernel.release) 2109 2110kernelversion: 2111 @echo $(KERNELVERSION) 2112 2113image_name: 2114 @echo $(KBUILD_IMAGE) 2115 2116PHONY += run-command 2117run-command: 2118 $(Q)$(KBUILD_RUN_COMMAND) 2119 2120quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2121 cmd_rmfiles = rm -rf $(rm-files) 2122 2123# read saved command lines for existing targets 2124existing-targets := $(wildcard $(sort $(targets))) 2125 2126-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2127 2128endif # config-build 2129endif # mixed-build 2130endif # need-sub-make 2131 2132PHONY += FORCE 2133FORCE: 2134 2135# Declare the contents of the PHONY variable as phony. We keep that 2136# information in a variable so we can use it in if_changed and friends. 2137.PHONY: $(PHONY) 2138