1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 12 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_objtree := $(CURDIR) 44 45ifneq ($(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 := $(M) 135endif 136 137$(if $(word 2, $(KBUILD_EXTMOD)), \ 138 $(error building multiple external modules is not supported)) 139 140$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 141 $(error module directory path cannot contain '$x'))) 142 143# Remove trailing slashes 144ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 145KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 146endif 147 148export KBUILD_EXTMOD 149 150# backward compatibility 151KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 152 153ifeq ("$(origin W)", "command line") 154 KBUILD_EXTRA_WARN := $(W) 155endif 156 157export KBUILD_EXTRA_WARN 158 159# Kbuild will save output files in the current working directory. 160# This does not need to match to the root of the kernel source tree. 161# 162# For example, you can do this: 163# 164# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165# 166# If you want to save output files in a different location, there are 167# two syntaxes to specify it. 168# 169# 1) O= 170# Use "make O=dir/to/store/output/files/" 171# 172# 2) Set KBUILD_OUTPUT 173# Set the environment variable KBUILD_OUTPUT to point to the output directory. 174# export KBUILD_OUTPUT=dir/to/store/output/files/; make 175# 176# The O= assignment takes precedence over the KBUILD_OUTPUT environment 177# variable. 178 179# Do we want to change the working directory? 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifneq ($(KBUILD_OUTPUT),) 185# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 186$(shell mkdir -p "$(KBUILD_OUTPUT)") 187# $(realpath ...) resolves symlinks 188abs_objtree := $(realpath $(KBUILD_OUTPUT)) 189$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 193$(error source directory cannot contain spaces or colons) 194endif 195 196export sub_make_done := 1 197 198endif # sub_make_done 199 200ifeq ($(abs_objtree),$(CURDIR)) 201# Suppress "Entering directory ..." if we are at the final work directory. 202no-print-directory := --no-print-directory 203else 204# Recursion to show "Entering directory ..." 205need-sub-make := 1 206endif 207 208ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 209# If --no-print-directory is unset, recurse once again to set it. 210# You may end up recursing into __sub-make twice. This is needed due to the 211# behavior change in GNU Make 4.4.1. 212need-sub-make := 1 213endif 214 215ifeq ($(need-sub-make),1) 216 217PHONY += $(MAKECMDGOALS) __sub-make 218 219$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 220 @: 221 222# Invoke a second make in the output directory, passing relevant variables 223__sub-make: 224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 226 227else # need-sub-make 228 229# We process the rest of the Makefile if this is the final invocation of make 230 231ifeq ($(abs_srctree),$(abs_objtree)) 232 # building in the source tree 233 srctree := . 234 building_out_of_srctree := 235else 236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 237 # building in a subdirectory of the source tree 238 srctree := .. 239 else 240 srctree := $(abs_srctree) 241 endif 242 building_out_of_srctree := 1 243endif 244 245ifneq ($(KBUILD_ABS_SRCTREE),) 246srctree := $(abs_srctree) 247endif 248 249objtree := . 250 251VPATH := 252 253ifeq ($(KBUILD_EXTMOD),) 254ifdef building_out_of_srctree 255VPATH := $(srctree) 256endif 257endif 258 259export building_out_of_srctree srctree objtree VPATH 260 261# To make sure we do not include .config for any of the *config targets 262# catch them early, and hand them over to scripts/kconfig/Makefile 263# It is allowed to specify more targets when calling make, including 264# mixing *config targets and build targets. 265# For example 'make oldconfig all'. 266# Detect when mixed targets is specified, and make a second invocation 267# of make so .config is not included in this case either (for *config). 268 269version_h := include/generated/uapi/linux/version.h 270 271clean-targets := %clean mrproper cleandocs 272no-dot-config-targets := $(clean-targets) \ 273 cscope gtags TAGS tags help% %docs check% coccicheck \ 274 $(version_h) headers headers_% archheaders archscripts \ 275 %asm-generic kernelversion %src-pkg dt_binding_check \ 276 outputmakefile rustavailable rustfmt rustfmtcheck 277no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 278 image_name 279single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 280 281config-build := 282mixed-build := 283need-config := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 may-sync-config := 296 endif 297endif 298 299need-compiler := $(may-sync-config) 300 301ifneq ($(KBUILD_EXTMOD),) 302 may-sync-config := 303endif 304 305ifeq ($(KBUILD_EXTMOD),) 306 ifneq ($(filter %config,$(MAKECMDGOALS)),) 307 config-build := 1 308 ifneq ($(words $(MAKECMDGOALS)),1) 309 mixed-build := 1 310 endif 311 endif 312endif 313 314# We cannot build single targets and the others at the same time 315ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 316 single-build := 1 317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 318 mixed-build := 1 319 endif 320endif 321 322# For "make -j clean all", "make -j mrproper defconfig all", etc. 323ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 325 mixed-build := 1 326 endif 327endif 328 329# install and modules_install need also be processed one by one 330ifneq ($(filter install,$(MAKECMDGOALS)),) 331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 332 mixed-build := 1 333 endif 334endif 335 336ifdef mixed-build 337# =========================================================================== 338# We're called with mixed targets (*config and build targets). 339# Handle them one by one. 340 341PHONY += $(MAKECMDGOALS) __build_one_by_one 342 343$(MAKECMDGOALS): __build_one_by_one 344 @: 345 346__build_one_by_one: 347 $(Q)set -e; \ 348 for i in $(MAKECMDGOALS); do \ 349 $(MAKE) -f $(srctree)/Makefile $$i; \ 350 done 351 352else # !mixed-build 353 354include $(srctree)/scripts/Kbuild.include 355 356# Read KERNELRELEASE from include/config/kernel.release (if it exists) 357KERNELRELEASE = $(call read-file, include/config/kernel.release) 358KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 359export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 360 361include $(srctree)/scripts/subarch.include 362 363# Cross compiling and selecting different set of gcc/bin-utils 364# --------------------------------------------------------------------------- 365# 366# When performing cross compilation for other architectures ARCH shall be set 367# to the target architecture. (See arch/* for the possibilities). 368# ARCH can be set during invocation of make: 369# make ARCH=arm64 370# Another way is to have ARCH set in the environment. 371# The default ARCH is the host where make is executed. 372 373# CROSS_COMPILE specify the prefix used for all executables used 374# during compilation. Only gcc and related bin-utils executables 375# are prefixed with $(CROSS_COMPILE). 376# CROSS_COMPILE can be set on the command line 377# make CROSS_COMPILE=aarch64-linux-gnu- 378# Alternatively CROSS_COMPILE can be set in the environment. 379# Default value for CROSS_COMPILE is not to prefix executables 380# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 381ARCH ?= $(SUBARCH) 382 383# Architecture as present in compile.h 384UTS_MACHINE := $(ARCH) 385SRCARCH := $(ARCH) 386 387# Additional ARCH settings for x86 388ifeq ($(ARCH),i386) 389 SRCARCH := x86 390endif 391ifeq ($(ARCH),x86_64) 392 SRCARCH := x86 393endif 394 395# Additional ARCH settings for sparc 396ifeq ($(ARCH),sparc32) 397 SRCARCH := sparc 398endif 399ifeq ($(ARCH),sparc64) 400 SRCARCH := sparc 401endif 402 403# Additional ARCH settings for parisc 404ifeq ($(ARCH),parisc64) 405 SRCARCH := parisc 406endif 407 408export cross_compiling := 409ifneq ($(SRCARCH),$(SUBARCH)) 410cross_compiling := 1 411endif 412 413KCONFIG_CONFIG ?= .config 414export KCONFIG_CONFIG 415 416# SHELL used by kbuild 417CONFIG_SHELL := sh 418 419HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 420HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 421HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 422 423ifneq ($(LLVM),) 424ifneq ($(filter %/,$(LLVM)),) 425LLVM_PREFIX := $(LLVM) 426else ifneq ($(filter -%,$(LLVM)),) 427LLVM_SUFFIX := $(LLVM) 428endif 429 430HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 431HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 432else 433HOSTCC = gcc 434HOSTCXX = g++ 435endif 436HOSTRUSTC = rustc 437HOSTPKG_CONFIG = pkg-config 438 439KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 440 -O2 -fomit-frame-pointer -std=gnu11 441KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 442KBUILD_USERLDFLAGS := $(USERLDFLAGS) 443 444# These flags apply to all Rust code in the tree, including the kernel and 445# host programs. 446export rust_common_flags := --edition=2021 \ 447 -Zbinary_dep_depinfo=y \ 448 -Astable_features \ 449 -Dnon_ascii_idents \ 450 -Dunsafe_op_in_unsafe_fn \ 451 -Wmissing_docs \ 452 -Wrust_2018_idioms \ 453 -Wunreachable_pub \ 454 -Wclippy::all \ 455 -Wclippy::dbg_macro \ 456 -Wclippy::mut_mut \ 457 -Wclippy::needless_bitwise_bool \ 458 -Wclippy::needless_continue \ 459 -Wclippy::no_mangle_with_rust_abi \ 460 -Wclippy::undocumented_unsafe_blocks \ 461 -Wclippy::unnecessary_safety_comment \ 462 -Wrustdoc::missing_crate_level_docs 463 464KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 465 $(HOSTCFLAGS) -I $(srctree)/scripts/include 466KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 467 -I $(srctree)/scripts/include 468KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 469 -Zallow-features= $(HOSTRUSTFLAGS) 470KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 471KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 472 473# Make variables (CC, etc...) 474CPP = $(CC) -E 475ifneq ($(LLVM),) 476CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 477LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 478AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 479NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 480OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 481OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 482READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 483STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 484else 485CC = $(CROSS_COMPILE)gcc 486LD = $(CROSS_COMPILE)ld 487AR = $(CROSS_COMPILE)ar 488NM = $(CROSS_COMPILE)nm 489OBJCOPY = $(CROSS_COMPILE)objcopy 490OBJDUMP = $(CROSS_COMPILE)objdump 491READELF = $(CROSS_COMPILE)readelf 492STRIP = $(CROSS_COMPILE)strip 493endif 494RUSTC = rustc 495RUSTDOC = rustdoc 496RUSTFMT = rustfmt 497CLIPPY_DRIVER = clippy-driver 498BINDGEN = bindgen 499PAHOLE = pahole 500RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 501LEX = flex 502YACC = bison 503AWK = awk 504INSTALLKERNEL := installkernel 505PERL = perl 506PYTHON3 = python3 507CHECK = sparse 508BASH = bash 509KGZIP = gzip 510KBZIP2 = bzip2 511KLZOP = lzop 512LZMA = lzma 513LZ4 = lz4c 514XZ = xz 515ZSTD = zstd 516 517CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 518 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 519NOSTDINC_FLAGS := 520CFLAGS_MODULE = 521RUSTFLAGS_MODULE = 522AFLAGS_MODULE = 523LDFLAGS_MODULE = 524CFLAGS_KERNEL = 525RUSTFLAGS_KERNEL = 526AFLAGS_KERNEL = 527LDFLAGS_vmlinux = 528 529# Use USERINCLUDE when you must reference the UAPI directories only. 530USERINCLUDE := \ 531 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 532 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 533 -I$(srctree)/include/uapi \ 534 -I$(objtree)/include/generated/uapi \ 535 -include $(srctree)/include/linux/compiler-version.h \ 536 -include $(srctree)/include/linux/kconfig.h 537 538# Use LINUXINCLUDE when you must reference the include/ directory. 539# Needed to be compatible with the O= option 540LINUXINCLUDE := \ 541 -I$(srctree)/arch/$(SRCARCH)/include \ 542 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 543 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 544 -I$(objtree)/include \ 545 $(USERINCLUDE) 546 547KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 548 549KBUILD_CFLAGS := 550KBUILD_CFLAGS += -std=gnu11 551KBUILD_CFLAGS += -fshort-wchar 552KBUILD_CFLAGS += -funsigned-char 553KBUILD_CFLAGS += -fno-common 554KBUILD_CFLAGS += -fno-PIE 555KBUILD_CFLAGS += -fno-strict-aliasing 556 557KBUILD_CPPFLAGS := -D__KERNEL__ 558KBUILD_RUSTFLAGS := $(rust_common_flags) \ 559 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 560 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 561 -Csymbol-mangling-version=v0 \ 562 -Crelocation-model=static \ 563 -Zfunction-sections=n \ 564 -Wclippy::float_arithmetic 565 566KBUILD_AFLAGS_KERNEL := 567KBUILD_CFLAGS_KERNEL := 568KBUILD_RUSTFLAGS_KERNEL := 569KBUILD_AFLAGS_MODULE := -DMODULE 570KBUILD_CFLAGS_MODULE := -DMODULE 571KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 572KBUILD_LDFLAGS_MODULE := 573KBUILD_LDFLAGS := 574CLANG_FLAGS := 575 576ifeq ($(KBUILD_CLIPPY),1) 577 RUSTC_OR_CLIPPY_QUIET := CLIPPY 578 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 579else 580 RUSTC_OR_CLIPPY_QUIET := RUSTC 581 RUSTC_OR_CLIPPY = $(RUSTC) 582endif 583 584# Allows the usage of unstable features in stable compilers. 585export RUSTC_BOOTSTRAP := 1 586 587export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 588export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 589export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 590export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 591export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 592export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 593export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 594export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 595 596export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 597export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 598export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 599export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 600export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 601export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 602 603# Files to ignore in find ... statements 604 605export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 606 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 607 -prune -o 608 609# =========================================================================== 610# Rules shared between *config targets and build targets 611 612# Basic helpers built in scripts/basic/ 613PHONY += scripts_basic 614scripts_basic: 615 $(Q)$(MAKE) $(build)=scripts/basic 616 617PHONY += outputmakefile 618ifdef building_out_of_srctree 619# Before starting out-of-tree build, make sure the source tree is clean. 620# outputmakefile generates a Makefile in the output directory, if using a 621# separate output directory. This allows convenient use of make in the 622# output directory. 623# At the same time when output Makefile generated, generate .gitignore to 624# ignore whole output directory 625 626quiet_cmd_makefile = GEN Makefile 627 cmd_makefile = { \ 628 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 629 echo "include $(srctree)/Makefile"; \ 630 } > Makefile 631 632outputmakefile: 633 @if [ -f $(srctree)/.config -o \ 634 -d $(srctree)/include/config -o \ 635 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 636 echo >&2 "***"; \ 637 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 638 echo >&2 "*** in $(abs_srctree)";\ 639 echo >&2 "***"; \ 640 false; \ 641 fi 642 $(Q)ln -fsn $(srctree) source 643 $(call cmd,makefile) 644 $(Q)test -e .gitignore || \ 645 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 646endif 647 648# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 649# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 650# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 651# need export), and from include/config/auto.conf.cmd to detect the compiler 652# upgrade. 653CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 654RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 655 656ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 657include $(srctree)/scripts/Makefile.clang 658endif 659 660# Include this also for config targets because some architectures need 661# cc-cross-prefix to determine CROSS_COMPILE. 662ifdef need-compiler 663include $(srctree)/scripts/Makefile.compiler 664endif 665 666ifdef config-build 667# =========================================================================== 668# *config targets only - make sure prerequisites are updated, and descend 669# in scripts/kconfig to make the *config target 670 671# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 672# KBUILD_DEFCONFIG may point out an alternative default configuration 673# used for 'make defconfig' 674include $(srctree)/arch/$(SRCARCH)/Makefile 675export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 676 677config: outputmakefile scripts_basic FORCE 678 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 679 680%config: outputmakefile scripts_basic FORCE 681 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 682 683else #!config-build 684# =========================================================================== 685# Build targets only - this includes vmlinux, arch-specific targets, clean 686# targets and others. In general all targets except *config targets. 687 688# If building an external module we do not care about the all: rule 689# but instead __all depend on modules 690PHONY += all 691ifeq ($(KBUILD_EXTMOD),) 692__all: all 693else 694__all: modules 695endif 696 697targets := 698 699# Decide whether to build built-in, modular, or both. 700# Normally, just do built-in. 701 702KBUILD_MODULES := 703KBUILD_BUILTIN := 1 704 705# If we have only "make modules", don't compile built-in objects. 706ifeq ($(MAKECMDGOALS),modules) 707 KBUILD_BUILTIN := 708endif 709 710# If we have "make <whatever> modules", compile modules 711# in addition to whatever we do anyway. 712# Just "make" or "make all" shall build modules as well 713 714ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 715 KBUILD_MODULES := 1 716endif 717 718ifeq ($(MAKECMDGOALS),) 719 KBUILD_MODULES := 1 720endif 721 722export KBUILD_MODULES KBUILD_BUILTIN 723 724ifdef need-config 725include include/config/auto.conf 726endif 727 728ifeq ($(KBUILD_EXTMOD),) 729# Objects we will link into vmlinux / subdirs we need to visit 730core-y := 731drivers-y := 732libs-y := lib/ 733endif # KBUILD_EXTMOD 734 735# The all: target is the default when no target is given on the 736# command line. 737# This allow a user to issue only 'make' to build a kernel including modules 738# Defaults to vmlinux, but the arch makefile usually adds further targets 739all: vmlinux 740 741CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 742ifdef CONFIG_CC_IS_GCC 743CFLAGS_GCOV += -fno-tree-loop-im 744endif 745export CFLAGS_GCOV 746 747# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 748ifdef CONFIG_FUNCTION_TRACER 749 CC_FLAGS_FTRACE := -pg 750endif 751 752include $(srctree)/arch/$(SRCARCH)/Makefile 753 754ifdef need-config 755ifdef may-sync-config 756# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 757# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 758# because some architectures define CROSS_COMPILE there. 759include include/config/auto.conf.cmd 760 761$(KCONFIG_CONFIG): 762 @echo >&2 '***' 763 @echo >&2 '*** Configuration file "$@" not found!' 764 @echo >&2 '***' 765 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 766 @echo >&2 '*** "make menuconfig" or "make xconfig").' 767 @echo >&2 '***' 768 @/bin/false 769 770# The actual configuration files used during the build are stored in 771# include/generated/ and include/config/. Update them if .config is newer than 772# include/config/auto.conf (which mirrors .config). 773# 774# This exploits the 'multi-target pattern rule' trick. 775# The syncconfig should be executed only once to make all the targets. 776# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 777# 778# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 779# so you cannot notice that Kconfig is waiting for the user input. 780%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 781 $(Q)$(kecho) " SYNC $@" 782 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 783else # !may-sync-config 784# External modules and some install targets need include/generated/autoconf.h 785# and include/config/auto.conf but do not care if they are up-to-date. 786# Use auto.conf to trigger the test 787PHONY += include/config/auto.conf 788 789include/config/auto.conf: 790 @test -e include/generated/autoconf.h -a -e $@ || ( \ 791 echo >&2; \ 792 echo >&2 " ERROR: Kernel configuration is invalid."; \ 793 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 794 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 795 echo >&2 ; \ 796 /bin/false) 797 798endif # may-sync-config 799endif # need-config 800 801KBUILD_CFLAGS += -fno-delete-null-pointer-checks 802 803ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 804KBUILD_CFLAGS += -O2 805KBUILD_RUSTFLAGS += -Copt-level=2 806else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 807KBUILD_CFLAGS += -Os 808KBUILD_RUSTFLAGS += -Copt-level=s 809endif 810 811# Always set `debug-assertions` and `overflow-checks` because their default 812# depends on `opt-level` and `debug-assertions`, respectively. 813KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 814KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 815 816# Tell gcc to never replace conditional load with a non-conditional one 817ifdef CONFIG_CC_IS_GCC 818# gcc-10 renamed --param=allow-store-data-races=0 to 819# -fno-allow-store-data-races. 820KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 821KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 822endif 823 824ifdef CONFIG_READABLE_ASM 825# Disable optimizations that make assembler listings hard to read. 826# reorder blocks reorders the control in the function 827# ipa clone creates specialized cloned functions 828# partial inlining inlines only parts of functions 829KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 830endif 831 832stackp-flags-y := -fno-stack-protector 833stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 834stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 835 836KBUILD_CFLAGS += $(stackp-flags-y) 837 838KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 839KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 840 841ifdef CONFIG_FRAME_POINTER 842KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 843KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 844else 845# Some targets (ARM with Thumb2, for example), can't be built with frame 846# pointers. For those, we don't have FUNCTION_TRACER automatically 847# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 848# incompatible with -fomit-frame-pointer with current GCC, so we don't use 849# -fomit-frame-pointer with FUNCTION_TRACER. 850# In the Rust target specification, "frame-pointer" is set explicitly 851# to "may-omit". 852ifndef CONFIG_FUNCTION_TRACER 853KBUILD_CFLAGS += -fomit-frame-pointer 854endif 855endif 856 857# Initialize all stack variables with a 0xAA pattern. 858ifdef CONFIG_INIT_STACK_ALL_PATTERN 859KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 860endif 861 862# Initialize all stack variables with a zero value. 863ifdef CONFIG_INIT_STACK_ALL_ZERO 864KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 865ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 866# https://github.com/llvm/llvm-project/issues/44842 867CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 868export CC_AUTO_VAR_INIT_ZERO_ENABLER 869KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 870endif 871endif 872 873# While VLAs have been removed, GCC produces unreachable stack probes 874# for the randomize_kstack_offset feature. Disable it for all compilers. 875KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 876 877# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 878ifdef CONFIG_ZERO_CALL_USED_REGS 879KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 880endif 881 882ifdef CONFIG_FUNCTION_TRACER 883ifdef CONFIG_FTRACE_MCOUNT_USE_CC 884 CC_FLAGS_FTRACE += -mrecord-mcount 885 ifdef CONFIG_HAVE_NOP_MCOUNT 886 ifeq ($(call cc-option-yn, -mnop-mcount),y) 887 CC_FLAGS_FTRACE += -mnop-mcount 888 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 889 endif 890 endif 891endif 892ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 893 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 894 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 895 endif 896endif 897ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 898 ifdef CONFIG_HAVE_C_RECORDMCOUNT 899 BUILD_C_RECORDMCOUNT := y 900 export BUILD_C_RECORDMCOUNT 901 endif 902endif 903ifdef CONFIG_HAVE_FENTRY 904 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 905 ifeq ($(call cc-option-yn, -mfentry),y) 906 CC_FLAGS_FTRACE += -mfentry 907 CC_FLAGS_USING += -DCC_USING_FENTRY 908 endif 909endif 910export CC_FLAGS_FTRACE 911KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 912KBUILD_AFLAGS += $(CC_FLAGS_USING) 913endif 914 915# We trigger additional mismatches with less inlining 916ifdef CONFIG_DEBUG_SECTION_MISMATCH 917KBUILD_CFLAGS += -fno-inline-functions-called-once 918endif 919 920# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 921ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 922KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 923KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 924LDFLAGS_vmlinux += --gc-sections 925endif 926 927ifdef CONFIG_SHADOW_CALL_STACK 928ifndef CONFIG_DYNAMIC_SCS 929CC_FLAGS_SCS := -fsanitize=shadow-call-stack 930KBUILD_CFLAGS += $(CC_FLAGS_SCS) 931KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 932endif 933export CC_FLAGS_SCS 934endif 935 936ifdef CONFIG_LTO_CLANG 937ifdef CONFIG_LTO_CLANG_THIN 938CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 939else 940CC_FLAGS_LTO := -flto 941endif 942CC_FLAGS_LTO += -fvisibility=hidden 943 944# Limit inlining across translation units to reduce binary size 945KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 946endif 947 948ifdef CONFIG_LTO 949KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 950KBUILD_AFLAGS += -fno-lto 951export CC_FLAGS_LTO 952endif 953 954ifdef CONFIG_CFI_CLANG 955CC_FLAGS_CFI := -fsanitize=kcfi 956ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 957 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 958endif 959ifdef CONFIG_RUST 960 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 961 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 962 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 963 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 964 export RUSTC_FLAGS_CFI 965endif 966KBUILD_CFLAGS += $(CC_FLAGS_CFI) 967export CC_FLAGS_CFI 968endif 969 970# Architectures can define flags to add/remove for floating-point support 971CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 972export CC_FLAGS_FPU 973export CC_FLAGS_NO_FPU 974 975ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 976# Set the minimal function alignment. Use the newer GCC option 977# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 978# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 979ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 980KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 981else 982KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 983endif 984endif 985 986# arch Makefile may override CC so keep this after arch Makefile is included 987NOSTDINC_FLAGS += -nostdinc 988 989# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 990# the kernel uses only C99 flexible arrays for dynamically sized trailing 991# arrays. Enforce this for everything that may examine structure sizes and 992# perform bounds checking. 993KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 994 995#Currently, disable -Wstringop-overflow for GCC 11, globally. 996KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 997KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 998 999# disable invalid "can't wrap" optimizations for signed / pointers 1000KBUILD_CFLAGS += -fno-strict-overflow 1001 1002# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1003KBUILD_CFLAGS += -fno-stack-check 1004 1005# conserve stack if available 1006ifdef CONFIG_CC_IS_GCC 1007KBUILD_CFLAGS += -fconserve-stack 1008endif 1009 1010# change __FILE__ to the relative path from the srctree 1011KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1012 1013# include additional Makefiles when needed 1014include-y := scripts/Makefile.extrawarn 1015include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1016include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1017include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1018include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1019include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1020include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1021include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1022include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1023include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1024 1025include $(addprefix $(srctree)/, $(include-y)) 1026 1027# scripts/Makefile.gcc-plugins is intentionally included last. 1028# Do not add $(call cc-option,...) below this line. When you build the kernel 1029# from the clean source tree, the GCC plugins do not exist at this point. 1030 1031# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1032KBUILD_CPPFLAGS += $(KCPPFLAGS) 1033KBUILD_AFLAGS += $(KAFLAGS) 1034KBUILD_CFLAGS += $(KCFLAGS) 1035KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1036 1037KBUILD_LDFLAGS_MODULE += --build-id=sha1 1038LDFLAGS_vmlinux += --build-id=sha1 1039 1040KBUILD_LDFLAGS += -z noexecstack 1041ifeq ($(CONFIG_LD_IS_BFD),y) 1042KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1043endif 1044 1045ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1046LDFLAGS_vmlinux += -X 1047endif 1048 1049ifeq ($(CONFIG_RELR),y) 1050# ld.lld before 15 did not support -z pack-relative-relocs. 1051LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1052endif 1053 1054# We never want expected sections to be placed heuristically by the 1055# linker. All sections should be explicitly named in the linker script. 1056ifdef CONFIG_LD_ORPHAN_WARN 1057LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1058endif 1059 1060# Align the bit size of userspace programs with the kernel 1061KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1062KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1063 1064# make the checker run with the right architecture 1065CHECKFLAGS += --arch=$(ARCH) 1066 1067# insure the checker run with the right endianness 1068CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1069 1070# the checker needs the correct machine size 1071CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1072 1073# Default kernel image to build when no specific target is given. 1074# KBUILD_IMAGE may be overruled on the command line or 1075# set in the environment 1076# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1077# this default value 1078export KBUILD_IMAGE ?= vmlinux 1079 1080# 1081# INSTALL_PATH specifies where to place the updated kernel and system map 1082# images. Default is /boot, but you can set it to other values 1083export INSTALL_PATH ?= /boot 1084 1085# 1086# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1087# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1088# an argument if needed. Otherwise it defaults to the kernel install path 1089# 1090export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1091 1092# 1093# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1094# relocations required by build roots. This is not defined in the 1095# makefile but the argument can be passed to make if needed. 1096# 1097 1098MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1099export MODLIB 1100 1101PHONY += prepare0 1102 1103export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1104export MODORDER := $(extmod_prefix)modules.order 1105export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1106 1107ifeq ($(KBUILD_EXTMOD),) 1108 1109build-dir := . 1110clean-dirs := $(sort . Documentation \ 1111 $(patsubst %/,%,$(filter %/, $(core-) \ 1112 $(drivers-) $(libs-)))) 1113 1114export ARCH_CORE := $(core-y) 1115export ARCH_LIB := $(filter %/, $(libs-y)) 1116export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1117# Externally visible symbols (used by link-vmlinux.sh) 1118 1119KBUILD_VMLINUX_OBJS := ./built-in.a 1120ifdef CONFIG_MODULES 1121KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1122KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1123else 1124KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1125endif 1126 1127export KBUILD_VMLINUX_LIBS 1128export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1129 1130ifdef CONFIG_TRIM_UNUSED_KSYMS 1131# For the kernel to actually contain only the needed exported symbols, 1132# we have to build modules as well to determine what those symbols are. 1133KBUILD_MODULES := 1 1134endif 1135 1136# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1137quiet_cmd_ar_vmlinux.a = AR $@ 1138 cmd_ar_vmlinux.a = \ 1139 rm -f $@; \ 1140 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1141 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1142 1143targets += vmlinux.a 1144vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1145 $(call if_changed,ar_vmlinux.a) 1146 1147PHONY += vmlinux_o 1148vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1149 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1150 1151vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1152 @: 1153 1154PHONY += vmlinux 1155# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1156# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1157# unrelated; the decompressors just happen to have the same base name, 1158# arch/*/boot/compressed/vmlinux. 1159# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1160# 1161# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1162# https://savannah.gnu.org/bugs/?61463 1163# For Make > 4.4, the following simple code will work: 1164# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1165vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1166vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1167vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1168 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1169 1170# The actual objects are generated when descending, 1171# make sure no implicit rule kicks in 1172$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1173 1174ifeq ($(origin KERNELRELEASE),file) 1175filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1176else 1177filechk_kernel.release = echo $(KERNELRELEASE) 1178endif 1179 1180# Store (new) KERNELRELEASE string in include/config/kernel.release 1181include/config/kernel.release: FORCE 1182 $(call filechk,kernel.release) 1183 1184# Additional helpers built in scripts/ 1185# Carefully list dependencies so we do not try to build scripts twice 1186# in parallel 1187PHONY += scripts 1188scripts: scripts_basic scripts_dtc 1189 $(Q)$(MAKE) $(build)=$(@) 1190 1191# Things we need to do before we recursively start building the kernel 1192# or the modules are listed in "prepare". 1193# A multi level approach is used. prepareN is processed before prepareN-1. 1194# archprepare is used in arch Makefiles and when processed asm symlink, 1195# version.h and scripts_basic is processed / created. 1196 1197PHONY += prepare archprepare 1198 1199archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1200 asm-generic $(version_h) include/generated/utsrelease.h \ 1201 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1202 1203prepare0: archprepare 1204 $(Q)$(MAKE) $(build)=scripts/mod 1205 $(Q)$(MAKE) $(build)=. prepare 1206 1207# All the preparing.. 1208prepare: prepare0 1209ifdef CONFIG_RUST 1210 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1211 $(Q)$(MAKE) $(build)=rust 1212endif 1213 1214PHONY += remove-stale-files 1215remove-stale-files: 1216 $(Q)$(srctree)/scripts/remove-stale-files 1217 1218# Support for using generic headers in asm-generic 1219asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1220 1221PHONY += asm-generic uapi-asm-generic 1222asm-generic: uapi-asm-generic 1223 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1224 generic=include/asm-generic 1225uapi-asm-generic: 1226 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1227 generic=include/uapi/asm-generic 1228 1229# Generate some files 1230# --------------------------------------------------------------------------- 1231 1232# KERNELRELEASE can change from a few different places, meaning version.h 1233# needs to be updated, so this check is forced on all builds 1234 1235uts_len := 64 1236define filechk_utsrelease.h 1237 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1238 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1239 exit 1; \ 1240 fi; \ 1241 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1242endef 1243 1244define filechk_version.h 1245 if [ $(SUBLEVEL) -gt 255 ]; then \ 1246 echo \#define LINUX_VERSION_CODE $(shell \ 1247 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1248 else \ 1249 echo \#define LINUX_VERSION_CODE $(shell \ 1250 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1251 fi; \ 1252 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1253 ((c) > 255 ? 255 : (c)))'; \ 1254 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1255 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1256 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1257endef 1258 1259$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1260$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1261$(version_h): FORCE 1262 $(call filechk,version.h) 1263 1264include/generated/utsrelease.h: include/config/kernel.release FORCE 1265 $(call filechk,utsrelease.h) 1266 1267filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1268 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1269 1270include/generated/compile.h: FORCE 1271 $(call filechk,compile.h) 1272 1273PHONY += headerdep 1274headerdep: 1275 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1276 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1277 1278# --------------------------------------------------------------------------- 1279# Kernel headers 1280 1281#Default location for installed headers 1282export INSTALL_HDR_PATH = $(objtree)/usr 1283 1284quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1285 cmd_headers_install = \ 1286 mkdir -p $(INSTALL_HDR_PATH); \ 1287 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1288 usr/include $(INSTALL_HDR_PATH) 1289 1290PHONY += headers_install 1291headers_install: headers 1292 $(call cmd,headers_install) 1293 1294PHONY += archheaders archscripts 1295 1296hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1297 1298PHONY += headers 1299headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1300 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1301 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1302 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1303 1304ifdef CONFIG_HEADERS_INSTALL 1305prepare: headers 1306endif 1307 1308PHONY += scripts_unifdef 1309scripts_unifdef: scripts_basic 1310 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1311 1312# --------------------------------------------------------------------------- 1313# Install 1314 1315# Many distributions have the custom install script, /sbin/installkernel. 1316# If DKMS is installed, 'make install' will eventually recurse back 1317# to this Makefile to build and install external modules. 1318# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1319 1320quiet_cmd_install = INSTALL $(INSTALL_PATH) 1321 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1322 1323# --------------------------------------------------------------------------- 1324# vDSO install 1325 1326PHONY += vdso_install 1327vdso_install: export INSTALL_FILES = $(vdso-install-y) 1328vdso_install: 1329 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1330 1331# --------------------------------------------------------------------------- 1332# Tools 1333 1334ifdef CONFIG_OBJTOOL 1335prepare: tools/objtool 1336endif 1337 1338ifdef CONFIG_BPF 1339ifdef CONFIG_DEBUG_INFO_BTF 1340prepare: tools/bpf/resolve_btfids 1341endif 1342endif 1343 1344# The tools build system is not a part of Kbuild and tends to introduce 1345# its own unique issues. If you need to integrate a new tool into Kbuild, 1346# please consider locating that tool outside the tools/ tree and using the 1347# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1348# here. See Documentation/kbuild/makefiles.rst for details. 1349 1350PHONY += resolve_btfids_clean 1351 1352resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1353 1354# tools/bpf/resolve_btfids directory might not exist 1355# in output directory, skip its clean in that case 1356resolve_btfids_clean: 1357ifneq ($(wildcard $(resolve_btfids_O)),) 1358 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1359endif 1360 1361# Clear a bunch of variables before executing the submake 1362ifeq ($(quiet),silent_) 1363tools_silent=s 1364endif 1365 1366tools/: FORCE 1367 $(Q)mkdir -p $(objtree)/tools 1368 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1369 1370tools/%: FORCE 1371 $(Q)mkdir -p $(objtree)/tools 1372 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1373 1374# --------------------------------------------------------------------------- 1375# Kernel selftest 1376 1377PHONY += kselftest 1378kselftest: headers 1379 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1380 1381kselftest-%: headers FORCE 1382 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1383 1384PHONY += kselftest-merge 1385kselftest-merge: 1386 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1387 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1388 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1389 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1390 1391# --------------------------------------------------------------------------- 1392# Devicetree files 1393 1394ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1395dtstree := arch/$(SRCARCH)/boot/dts 1396endif 1397 1398ifneq ($(dtstree),) 1399 1400%.dtb: dtbs_prepare 1401 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1402 1403%.dtbo: dtbs_prepare 1404 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1405 1406PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1407dtbs: dtbs_prepare 1408 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1409 1410# include/config/kernel.release is actually needed when installing DTBs because 1411# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1412# dtbs_install depend on it as dtbs_install may run as root. 1413dtbs_prepare: include/config/kernel.release scripts_dtc 1414 1415ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1416export CHECK_DTBS=y 1417endif 1418 1419ifneq ($(CHECK_DTBS),) 1420dtbs_prepare: dt_binding_schemas 1421endif 1422 1423dtbs_check: dtbs 1424 1425dtbs_install: 1426 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1427 1428ifdef CONFIG_OF_EARLY_FLATTREE 1429all: dtbs 1430endif 1431 1432endif 1433 1434PHONY += scripts_dtc 1435scripts_dtc: scripts_basic 1436 $(Q)$(MAKE) $(build)=scripts/dtc 1437 1438ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1439export CHECK_DTBS=y 1440endif 1441 1442PHONY += dt_binding_check dt_binding_schemas 1443dt_binding_check: dt_binding_schemas scripts_dtc 1444 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1445 1446dt_binding_schemas: 1447 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1448 1449PHONY += dt_compatible_check 1450dt_compatible_check: dt_binding_schemas 1451 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1452 1453# --------------------------------------------------------------------------- 1454# Modules 1455 1456ifdef CONFIG_MODULES 1457 1458# By default, build modules as well 1459 1460all: modules 1461 1462# When we're building modules with modversions, we need to consider 1463# the built-in objects during the descend as well, in order to 1464# make sure the checksums are up to date before we record them. 1465ifdef CONFIG_MODVERSIONS 1466 KBUILD_BUILTIN := 1 1467endif 1468 1469# Build modules 1470# 1471 1472# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1473# is an exception. 1474ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1475KBUILD_BUILTIN := 1 1476modules: vmlinux 1477endif 1478 1479modules: modules_prepare 1480 1481# Target to prepare building external modules 1482modules_prepare: prepare 1483 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1484 1485endif # CONFIG_MODULES 1486 1487### 1488# Cleaning is done on three levels. 1489# make clean Delete most generated files 1490# Leave enough to build external modules 1491# make mrproper Delete the current configuration, and all generated files 1492# make distclean Remove editor backup files, patch leftover files and the like 1493 1494# Directories & files removed with 'make clean' 1495CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1496 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1497 modules.builtin.ranges vmlinux.o.map \ 1498 compile_commands.json rust/test \ 1499 rust-project.json .vmlinux.objs .vmlinux.export.c 1500 1501# Directories & files removed with 'make mrproper' 1502MRPROPER_FILES += include/config include/generated \ 1503 arch/$(SRCARCH)/include/generated .objdiff \ 1504 debian snap tar-install PKGBUILD pacman \ 1505 .config .config.old .version \ 1506 Module.symvers \ 1507 certs/signing_key.pem \ 1508 certs/x509.genkey \ 1509 vmlinux-gdb.py \ 1510 rpmbuild \ 1511 rust/libmacros.so 1512 1513# clean - Delete most, but leave enough to build external modules 1514# 1515clean: private rm-files := $(CLEAN_FILES) 1516 1517PHONY += archclean vmlinuxclean 1518 1519vmlinuxclean: 1520 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1521 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1522 1523clean: archclean vmlinuxclean resolve_btfids_clean 1524 1525# mrproper - Delete all generated files, including .config 1526# 1527mrproper: private rm-files := $(MRPROPER_FILES) 1528mrproper-dirs := $(addprefix _mrproper_,scripts) 1529 1530PHONY += $(mrproper-dirs) mrproper 1531$(mrproper-dirs): 1532 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1533 1534mrproper: clean $(mrproper-dirs) 1535 $(call cmd,rmfiles) 1536 @find . $(RCS_FIND_IGNORE) \ 1537 \( -name '*.rmeta' \) \ 1538 -type f -print | xargs rm -f 1539 1540# distclean 1541# 1542PHONY += distclean 1543 1544distclean: mrproper 1545 @find . $(RCS_FIND_IGNORE) \ 1546 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1547 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1548 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1549 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1550 -type f -print | xargs rm -f 1551 1552 1553# Packaging of the kernel to various formats 1554# --------------------------------------------------------------------------- 1555 1556%src-pkg: FORCE 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1558%pkg: include/config/kernel.release FORCE 1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1560 1561# Brief documentation of the typical targets used 1562# --------------------------------------------------------------------------- 1563 1564boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1565boards := $(sort $(notdir $(boards))) 1566board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1567board-dirs := $(sort $(notdir $(board-dirs:/=))) 1568 1569PHONY += help 1570help: 1571 @echo 'Cleaning targets:' 1572 @echo ' clean - Remove most generated files but keep the config and' 1573 @echo ' enough build support to build external modules' 1574 @echo ' mrproper - Remove all generated files + config + various backup files' 1575 @echo ' distclean - mrproper + remove editor backup and patch files' 1576 @echo '' 1577 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1578 @echo '' 1579 @echo 'Other generic targets:' 1580 @echo ' all - Build all targets marked with [*]' 1581 @echo '* vmlinux - Build the bare kernel' 1582 @echo '* modules - Build all modules' 1583 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1584 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1585 @echo ' dir/ - Build all files in dir and below' 1586 @echo ' dir/file.[ois] - Build specified target only' 1587 @echo ' dir/file.ll - Build the LLVM assembly file' 1588 @echo ' (requires compiler support for LLVM assembly generation)' 1589 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1590 @echo ' (requires a recent binutils and recent build (System.map))' 1591 @echo ' dir/file.ko - Build module including final link' 1592 @echo ' modules_prepare - Set up for building external modules' 1593 @echo ' tags/TAGS - Generate tags file for editors' 1594 @echo ' cscope - Generate cscope index' 1595 @echo ' gtags - Generate GNU GLOBAL index' 1596 @echo ' kernelrelease - Output the release version string (use with make -s)' 1597 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1598 @echo ' image_name - Output the image name (use with make -s)' 1599 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1600 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1601 echo '' 1602 @echo 'Static analysers:' 1603 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1604 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1605 @echo ' versioncheck - Sanity check on version.h usage' 1606 @echo ' includecheck - Check for duplicate included header files' 1607 @echo ' export_report - List the usages of all exported symbols' 1608 @echo ' headerdep - Detect inclusion cycles in headers' 1609 @echo ' coccicheck - Check with Coccinelle' 1610 @echo ' clang-analyzer - Check with clang static analyzer' 1611 @echo ' clang-tidy - Check with clang-tidy' 1612 @echo '' 1613 @echo 'Tools:' 1614 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1615 @echo '' 1616 @echo 'Kernel selftest:' 1617 @echo ' kselftest - Build and run kernel selftest' 1618 @echo ' Build, install, and boot kernel before' 1619 @echo ' running kselftest on it' 1620 @echo ' Run as root for full coverage' 1621 @echo ' kselftest-all - Build kernel selftest' 1622 @echo ' kselftest-install - Build and install kernel selftest' 1623 @echo ' kselftest-clean - Remove all generated kselftest files' 1624 @echo ' kselftest-merge - Merge all the config dependencies of' 1625 @echo ' kselftest to existing .config.' 1626 @echo '' 1627 @echo 'Rust targets:' 1628 @echo ' rustavailable - Checks whether the Rust toolchain is' 1629 @echo ' available and, if not, explains why.' 1630 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1631 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1632 @echo ' is formatted, printing a diff otherwise.' 1633 @echo ' rustdoc - Generate Rust documentation' 1634 @echo ' (requires kernel .config)' 1635 @echo ' rusttest - Runs the Rust tests' 1636 @echo ' (requires kernel .config; downloads external repos)' 1637 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1638 @echo ' (requires kernel .config)' 1639 @echo ' dir/file.[os] - Build specified target only' 1640 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1641 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1642 @echo ' The output is not intended to be compilable.' 1643 @echo ' dir/file.ll - Build the LLVM assembly file' 1644 @echo '' 1645 @$(if $(dtstree), \ 1646 echo 'Devicetree:'; \ 1647 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1648 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1649 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1650 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1651 echo ' dtbs_check - Validate device tree source files';\ 1652 echo '') 1653 1654 @echo 'Userspace tools targets:' 1655 @echo ' use "make tools/help"' 1656 @echo ' or "cd tools; make help"' 1657 @echo '' 1658 @echo 'Kernel packaging:' 1659 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1660 @echo '' 1661 @echo 'Documentation targets:' 1662 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1663 @echo '' 1664 @echo 'Architecture-specific targets ($(SRCARCH)):' 1665 @$(or $(archhelp),\ 1666 echo ' No architecture-specific help defined for $(SRCARCH)') 1667 @echo '' 1668 @$(if $(boards), \ 1669 $(foreach b, $(boards), \ 1670 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1671 echo '') 1672 @$(if $(board-dirs), \ 1673 $(foreach b, $(board-dirs), \ 1674 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1675 printf " %-16s - Show all of the above\\n" help-boards; \ 1676 echo '') 1677 1678 @echo ' make V=n [targets] 1: verbose build' 1679 @echo ' 2: give reason for rebuild of target' 1680 @echo ' V=1 and V=2 can be combined with V=12' 1681 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1682 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1683 @echo ' (sparse by default)' 1684 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1685 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1686 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1687 @echo ' 1: warnings which may be relevant and do not occur too often' 1688 @echo ' 2: warnings which occur quite often but may still be relevant' 1689 @echo ' 3: more obscure warnings, can most likely be ignored' 1690 @echo ' c: extra checks in the configuration stage (Kconfig)' 1691 @echo ' e: warnings are being treated as errors' 1692 @echo ' Multiple levels can be combined with W=12 or W=123' 1693 @$(if $(dtstree), \ 1694 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1695 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1696 ) 1697 @echo '' 1698 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1699 @echo 'For further info see the ./README file' 1700 1701 1702help-board-dirs := $(addprefix help-,$(board-dirs)) 1703 1704help-boards: $(help-board-dirs) 1705 1706boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1707 1708$(help-board-dirs): help-%: 1709 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1710 @$(if $(boards-per-dir), \ 1711 $(foreach b, $(boards-per-dir), \ 1712 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1713 echo '') 1714 1715 1716# Documentation targets 1717# --------------------------------------------------------------------------- 1718DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1719 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1720PHONY += $(DOC_TARGETS) 1721$(DOC_TARGETS): 1722 $(Q)$(MAKE) $(build)=Documentation $@ 1723 1724 1725# Rust targets 1726# --------------------------------------------------------------------------- 1727 1728# "Is Rust available?" target 1729PHONY += rustavailable 1730rustavailable: 1731 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1732 1733# Documentation target 1734# 1735# Using the singular to avoid running afoul of `no-dot-config-targets`. 1736PHONY += rustdoc 1737rustdoc: prepare 1738 $(Q)$(MAKE) $(build)=rust $@ 1739 1740# Testing target 1741PHONY += rusttest 1742rusttest: prepare 1743 $(Q)$(MAKE) $(build)=rust $@ 1744 1745# Formatting targets 1746PHONY += rustfmt rustfmtcheck 1747 1748# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1749# 1750# We match using absolute paths since `find` does not resolve them 1751# when matching, which is a problem when e.g. `srctree` is `..`. 1752# We `grep` afterwards in order to remove the directory entry itself. 1753rustfmt: 1754 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1755 -o -path $(abs_srctree)/rust/alloc -prune \ 1756 -o -path $(abs_objtree)/rust/test -prune \ 1757 | grep -Fv $(abs_srctree)/rust/alloc \ 1758 | grep -Fv $(abs_objtree)/rust/test \ 1759 | grep -Fv generated \ 1760 | xargs $(RUSTFMT) $(rustfmt_flags) 1761 1762rustfmtcheck: rustfmt_flags = --check 1763rustfmtcheck: rustfmt 1764 1765# Misc 1766# --------------------------------------------------------------------------- 1767 1768PHONY += misc-check 1769misc-check: 1770 $(Q)$(srctree)/scripts/misc-check 1771 1772all: misc-check 1773 1774PHONY += scripts_gdb 1775scripts_gdb: prepare0 1776 $(Q)$(MAKE) $(build)=scripts/gdb 1777 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1778 1779ifdef CONFIG_GDB_SCRIPTS 1780all: scripts_gdb 1781endif 1782 1783else # KBUILD_EXTMOD 1784 1785filechk_kernel.release = echo $(KERNELRELEASE) 1786 1787### 1788# External module support. 1789# When building external modules the kernel used as basis is considered 1790# read-only, and no consistency checks are made and the make 1791# system is not used on the basis kernel. If updates are required 1792# in the basis kernel ordinary make commands (without M=...) must be used. 1793 1794# We are always building only modules. 1795KBUILD_BUILTIN := 1796KBUILD_MODULES := 1 1797 1798build-dir := $(KBUILD_EXTMOD) 1799 1800compile_commands.json: $(extmod_prefix)compile_commands.json 1801PHONY += compile_commands.json 1802 1803clean-dirs := $(KBUILD_EXTMOD) 1804clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1805 $(KBUILD_EXTMOD)/compile_commands.json 1806 1807PHONY += prepare 1808# now expand this into a simple variable to reduce the cost of shell evaluations 1809prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1810prepare: 1811 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1812 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1813 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1814 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1815 fi 1816 1817PHONY += help 1818help: 1819 @echo ' Building external modules.' 1820 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1821 @echo '' 1822 @echo ' modules - default target, build the module(s)' 1823 @echo ' modules_install - install the module' 1824 @echo ' clean - remove generated files in module directory only' 1825 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1826 @echo '' 1827 1828ifndef CONFIG_MODULES 1829modules modules_install: __external_modules_error 1830__external_modules_error: 1831 @echo >&2 '***' 1832 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1833 @echo >&2 '*** You cannot build or install external modules.' 1834 @echo >&2 '***' 1835 @false 1836endif 1837 1838endif # KBUILD_EXTMOD 1839 1840# --------------------------------------------------------------------------- 1841# Modules 1842 1843PHONY += modules modules_install modules_sign modules_prepare 1844 1845modules_install: 1846 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1847 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1848 1849ifeq ($(CONFIG_MODULE_SIG),y) 1850# modules_sign is a subset of modules_install. 1851# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1852modules_sign: modules_install 1853 @: 1854else 1855modules_sign: 1856 @echo >&2 '***' 1857 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1858 @echo >&2 '***' 1859 @false 1860endif 1861 1862ifdef CONFIG_MODULES 1863 1864$(MODORDER): $(build-dir) 1865 @: 1866 1867# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1868# This is solely useful to speed up test compiles. 1869modules: modpost 1870ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1871 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1872endif 1873 1874PHONY += modules_check 1875modules_check: $(MODORDER) 1876 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1877 1878else # CONFIG_MODULES 1879 1880modules: 1881 @: 1882 1883KBUILD_MODULES := 1884 1885endif # CONFIG_MODULES 1886 1887PHONY += modpost 1888modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1889 $(if $(KBUILD_MODULES), modules_check) 1890 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1891 1892# Single targets 1893# --------------------------------------------------------------------------- 1894# To build individual files in subdirectories, you can do like this: 1895# 1896# make foo/bar/baz.s 1897# 1898# The supported suffixes for single-target are listed in 'single-targets' 1899# 1900# To build only under specific subdirectories, you can do like this: 1901# 1902# make foo/bar/baz/ 1903 1904ifdef single-build 1905 1906# .ko is special because modpost is needed 1907single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1908single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1909 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1910 1911$(single-ko): single_modules 1912 @: 1913$(single-no-ko): $(build-dir) 1914 @: 1915 1916# Remove MODORDER when done because it is not the real one. 1917PHONY += single_modules 1918single_modules: $(single-no-ko) modules_prepare 1919 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1920 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1921ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1922 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1923endif 1924 $(Q)rm -f $(MODORDER) 1925 1926single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1927 1928KBUILD_MODULES := 1 1929 1930endif 1931 1932# Preset locale variables to speed up the build process. Limit locale 1933# tweaks to this spot to avoid wrong language settings when running 1934# make menuconfig etc. 1935# Error messages still appears in the original language 1936PHONY += $(build-dir) 1937$(build-dir): prepare 1938 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1939 1940clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1941PHONY += $(clean-dirs) clean 1942$(clean-dirs): 1943 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1944 1945clean: $(clean-dirs) 1946 $(call cmd,rmfiles) 1947 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1948 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1949 -o -name '*.ko.*' \ 1950 -o -name '*.dtb' -o -name '*.dtbo' \ 1951 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1952 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1953 -o -name '*.dwo' -o -name '*.lst' \ 1954 -o -name '*.su' -o -name '*.mod' \ 1955 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1956 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1957 -o -name '*.asn1.[ch]' \ 1958 -o -name '*.symtypes' -o -name 'modules.order' \ 1959 -o -name '*.c.[012]*.*' \ 1960 -o -name '*.ll' \ 1961 -o -name '*.gcno' \ 1962 \) -type f -print \ 1963 -o -name '.tmp_*' -print \ 1964 | xargs rm -rf 1965 1966# Generate tags for editors 1967# --------------------------------------------------------------------------- 1968quiet_cmd_tags = GEN $@ 1969 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1970 1971tags TAGS cscope gtags: FORCE 1972 $(call cmd,tags) 1973 1974# Generate rust-project.json (a file that describes the structure of non-Cargo 1975# Rust projects) for rust-analyzer (an implementation of the Language Server 1976# Protocol). 1977PHONY += rust-analyzer 1978rust-analyzer: 1979 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1980 $(Q)$(MAKE) $(build)=rust $@ 1981 1982# Script to generate missing namespace dependencies 1983# --------------------------------------------------------------------------- 1984 1985PHONY += nsdeps 1986nsdeps: export KBUILD_NSDEPS=1 1987nsdeps: modules 1988 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1989 1990# Clang Tooling 1991# --------------------------------------------------------------------------- 1992 1993quiet_cmd_gen_compile_commands = GEN $@ 1994 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1995 1996$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 1997 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1998 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1999 $(call if_changed,gen_compile_commands) 2000 2001targets += $(extmod_prefix)compile_commands.json 2002 2003PHONY += clang-tidy clang-analyzer 2004 2005ifdef CONFIG_CC_IS_CLANG 2006quiet_cmd_clang_tools = CHECK $< 2007 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2008 2009clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2010 $(call cmd,clang_tools) 2011else 2012clang-tidy clang-analyzer: 2013 @echo "$@ requires CC=clang" >&2 2014 @false 2015endif 2016 2017# Scripts to check various things for consistency 2018# --------------------------------------------------------------------------- 2019 2020PHONY += includecheck versioncheck coccicheck export_report 2021 2022includecheck: 2023 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2024 -name '*.[hcS]' -type f -print | sort \ 2025 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2026 2027versioncheck: 2028 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2029 -name '*.[hcS]' -type f -print | sort \ 2030 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2031 2032coccicheck: 2033 $(Q)$(BASH) $(srctree)/scripts/$@ 2034 2035export_report: 2036 $(PERL) $(srctree)/scripts/export_report.pl 2037 2038PHONY += checkstack kernelrelease kernelversion image_name 2039 2040# UML needs a little special treatment here. It wants to use the host 2041# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2042# else wants $(ARCH), including people doing cross-builds, which means 2043# that $(SUBARCH) doesn't work here. 2044ifeq ($(ARCH), um) 2045CHECKSTACK_ARCH := $(SUBARCH) 2046else 2047CHECKSTACK_ARCH := $(ARCH) 2048endif 2049MINSTACKSIZE ?= 100 2050checkstack: 2051 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2052 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2053 2054kernelrelease: 2055 @$(filechk_kernel.release) 2056 2057kernelversion: 2058 @echo $(KERNELVERSION) 2059 2060image_name: 2061 @echo $(KBUILD_IMAGE) 2062 2063PHONY += run-command 2064run-command: 2065 $(Q)$(KBUILD_RUN_COMMAND) 2066 2067quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2068 cmd_rmfiles = rm -rf $(rm-files) 2069 2070# read saved command lines for existing targets 2071existing-targets := $(wildcard $(sort $(targets))) 2072 2073-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2074 2075endif # config-build 2076endif # mixed-build 2077endif # need-sub-make 2078 2079PHONY += FORCE 2080FORCE: 2081 2082# Declare the contents of the PHONY variable as phony. We keep that 2083# information in a variable so we can use it in if_changed and friends. 2084.PHONY: $(PHONY) 2085