1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc6 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 -Dunsafe_op_in_unsafe_fn \ 450 -Dnon_ascii_idents \ 451 -Wrust_2018_idioms \ 452 -Wunreachable_pub \ 453 -Wmissing_docs \ 454 -Wrustdoc::missing_crate_level_docs \ 455 -Wclippy::all \ 456 -Wclippy::mut_mut \ 457 -Wclippy::needless_bitwise_bool \ 458 -Wclippy::needless_continue \ 459 -Wclippy::no_mangle_with_rust_abi \ 460 -Wclippy::dbg_macro 461 462KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 463 $(HOSTCFLAGS) -I $(srctree)/scripts/include 464KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 465 -I $(srctree)/scripts/include 466KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 467 -Zallow-features= $(HOSTRUSTFLAGS) 468KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 469KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 470 471# Make variables (CC, etc...) 472CPP = $(CC) -E 473ifneq ($(LLVM),) 474CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 475LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 476AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 477NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 478OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 479OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 480READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 481STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 482else 483CC = $(CROSS_COMPILE)gcc 484LD = $(CROSS_COMPILE)ld 485AR = $(CROSS_COMPILE)ar 486NM = $(CROSS_COMPILE)nm 487OBJCOPY = $(CROSS_COMPILE)objcopy 488OBJDUMP = $(CROSS_COMPILE)objdump 489READELF = $(CROSS_COMPILE)readelf 490STRIP = $(CROSS_COMPILE)strip 491endif 492RUSTC = rustc 493RUSTDOC = rustdoc 494RUSTFMT = rustfmt 495CLIPPY_DRIVER = clippy-driver 496BINDGEN = bindgen 497PAHOLE = pahole 498RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 499LEX = flex 500YACC = bison 501AWK = awk 502INSTALLKERNEL := installkernel 503PERL = perl 504PYTHON3 = python3 505CHECK = sparse 506BASH = bash 507KGZIP = gzip 508KBZIP2 = bzip2 509KLZOP = lzop 510LZMA = lzma 511LZ4 = lz4c 512XZ = xz 513ZSTD = zstd 514 515CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 516 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 517NOSTDINC_FLAGS := 518CFLAGS_MODULE = 519RUSTFLAGS_MODULE = 520AFLAGS_MODULE = 521LDFLAGS_MODULE = 522CFLAGS_KERNEL = 523RUSTFLAGS_KERNEL = 524AFLAGS_KERNEL = 525LDFLAGS_vmlinux = 526 527# Use USERINCLUDE when you must reference the UAPI directories only. 528USERINCLUDE := \ 529 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 530 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 531 -I$(srctree)/include/uapi \ 532 -I$(objtree)/include/generated/uapi \ 533 -include $(srctree)/include/linux/compiler-version.h \ 534 -include $(srctree)/include/linux/kconfig.h 535 536# Use LINUXINCLUDE when you must reference the include/ directory. 537# Needed to be compatible with the O= option 538LINUXINCLUDE := \ 539 -I$(srctree)/arch/$(SRCARCH)/include \ 540 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 541 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 542 -I$(objtree)/include \ 543 $(USERINCLUDE) 544 545KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 546 547KBUILD_CFLAGS := 548KBUILD_CFLAGS += -std=gnu11 549KBUILD_CFLAGS += -fshort-wchar 550KBUILD_CFLAGS += -funsigned-char 551KBUILD_CFLAGS += -fno-common 552KBUILD_CFLAGS += -fno-PIE 553KBUILD_CFLAGS += -fno-strict-aliasing 554 555KBUILD_CPPFLAGS := -D__KERNEL__ 556KBUILD_RUSTFLAGS := $(rust_common_flags) \ 557 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 558 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 559 -Csymbol-mangling-version=v0 \ 560 -Crelocation-model=static \ 561 -Zfunction-sections=n \ 562 -Wclippy::float_arithmetic 563 564KBUILD_AFLAGS_KERNEL := 565KBUILD_CFLAGS_KERNEL := 566KBUILD_RUSTFLAGS_KERNEL := 567KBUILD_AFLAGS_MODULE := -DMODULE 568KBUILD_CFLAGS_MODULE := -DMODULE 569KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 570KBUILD_LDFLAGS_MODULE := 571KBUILD_LDFLAGS := 572CLANG_FLAGS := 573 574ifeq ($(KBUILD_CLIPPY),1) 575 RUSTC_OR_CLIPPY_QUIET := CLIPPY 576 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 577else 578 RUSTC_OR_CLIPPY_QUIET := RUSTC 579 RUSTC_OR_CLIPPY = $(RUSTC) 580endif 581 582# Allows the usage of unstable features in stable compilers. 583export RUSTC_BOOTSTRAP := 1 584 585export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 586export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 587export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 588export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 589export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 590export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 591export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 592export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 593 594export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 595export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 596export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 597export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 598export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 599export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 600 601# Files to ignore in find ... statements 602 603export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 604 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 605 -prune -o 606 607# =========================================================================== 608# Rules shared between *config targets and build targets 609 610# Basic helpers built in scripts/basic/ 611PHONY += scripts_basic 612scripts_basic: 613 $(Q)$(MAKE) $(build)=scripts/basic 614 615PHONY += outputmakefile 616ifdef building_out_of_srctree 617# Before starting out-of-tree build, make sure the source tree is clean. 618# outputmakefile generates a Makefile in the output directory, if using a 619# separate output directory. This allows convenient use of make in the 620# output directory. 621# At the same time when output Makefile generated, generate .gitignore to 622# ignore whole output directory 623 624quiet_cmd_makefile = GEN Makefile 625 cmd_makefile = { \ 626 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 627 echo "include $(srctree)/Makefile"; \ 628 } > Makefile 629 630outputmakefile: 631 @if [ -f $(srctree)/.config -o \ 632 -d $(srctree)/include/config -o \ 633 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 634 echo >&2 "***"; \ 635 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 636 echo >&2 "*** in $(abs_srctree)";\ 637 echo >&2 "***"; \ 638 false; \ 639 fi 640 $(Q)ln -fsn $(srctree) source 641 $(call cmd,makefile) 642 $(Q)test -e .gitignore || \ 643 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 644endif 645 646# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 647# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 648# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 649# need export), and from include/config/auto.conf.cmd to detect the compiler 650# upgrade. 651CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 652RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 653 654ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 655include $(srctree)/scripts/Makefile.clang 656endif 657 658# Include this also for config targets because some architectures need 659# cc-cross-prefix to determine CROSS_COMPILE. 660ifdef need-compiler 661include $(srctree)/scripts/Makefile.compiler 662endif 663 664ifdef config-build 665# =========================================================================== 666# *config targets only - make sure prerequisites are updated, and descend 667# in scripts/kconfig to make the *config target 668 669# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 670# KBUILD_DEFCONFIG may point out an alternative default configuration 671# used for 'make defconfig' 672include $(srctree)/arch/$(SRCARCH)/Makefile 673export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 674 675config: outputmakefile scripts_basic FORCE 676 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 677 678%config: outputmakefile scripts_basic FORCE 679 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 680 681else #!config-build 682# =========================================================================== 683# Build targets only - this includes vmlinux, arch-specific targets, clean 684# targets and others. In general all targets except *config targets. 685 686# If building an external module we do not care about the all: rule 687# but instead __all depend on modules 688PHONY += all 689ifeq ($(KBUILD_EXTMOD),) 690__all: all 691else 692__all: modules 693endif 694 695targets := 696 697# Decide whether to build built-in, modular, or both. 698# Normally, just do built-in. 699 700KBUILD_MODULES := 701KBUILD_BUILTIN := 1 702 703# If we have only "make modules", don't compile built-in objects. 704ifeq ($(MAKECMDGOALS),modules) 705 KBUILD_BUILTIN := 706endif 707 708# If we have "make <whatever> modules", compile modules 709# in addition to whatever we do anyway. 710# Just "make" or "make all" shall build modules as well 711 712ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 713 KBUILD_MODULES := 1 714endif 715 716ifeq ($(MAKECMDGOALS),) 717 KBUILD_MODULES := 1 718endif 719 720export KBUILD_MODULES KBUILD_BUILTIN 721 722ifdef need-config 723include include/config/auto.conf 724endif 725 726ifeq ($(KBUILD_EXTMOD),) 727# Objects we will link into vmlinux / subdirs we need to visit 728core-y := 729drivers-y := 730libs-y := lib/ 731endif # KBUILD_EXTMOD 732 733# The all: target is the default when no target is given on the 734# command line. 735# This allow a user to issue only 'make' to build a kernel including modules 736# Defaults to vmlinux, but the arch makefile usually adds further targets 737all: vmlinux 738 739CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 740ifdef CONFIG_CC_IS_GCC 741CFLAGS_GCOV += -fno-tree-loop-im 742endif 743export CFLAGS_GCOV 744 745# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 746ifdef CONFIG_FUNCTION_TRACER 747 CC_FLAGS_FTRACE := -pg 748endif 749 750include $(srctree)/arch/$(SRCARCH)/Makefile 751 752ifdef need-config 753ifdef may-sync-config 754# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 755# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 756# because some architectures define CROSS_COMPILE there. 757include include/config/auto.conf.cmd 758 759$(KCONFIG_CONFIG): 760 @echo >&2 '***' 761 @echo >&2 '*** Configuration file "$@" not found!' 762 @echo >&2 '***' 763 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 764 @echo >&2 '*** "make menuconfig" or "make xconfig").' 765 @echo >&2 '***' 766 @/bin/false 767 768# The actual configuration files used during the build are stored in 769# include/generated/ and include/config/. Update them if .config is newer than 770# include/config/auto.conf (which mirrors .config). 771# 772# This exploits the 'multi-target pattern rule' trick. 773# The syncconfig should be executed only once to make all the targets. 774# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 775# 776# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 777# so you cannot notice that Kconfig is waiting for the user input. 778%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 779 $(Q)$(kecho) " SYNC $@" 780 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 781else # !may-sync-config 782# External modules and some install targets need include/generated/autoconf.h 783# and include/config/auto.conf but do not care if they are up-to-date. 784# Use auto.conf to show the error message 785 786checked-configs := include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf 787missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 788 789ifdef missing-configs 790PHONY += include/config/auto.conf 791 792include/config/auto.conf: 793 @echo >&2 '***' 794 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 795 @printf >&2 '*** - %s\n' $(missing-configs) 796 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 797 @echo >&2 '***' 798 @/bin/false 799endif 800 801endif # may-sync-config 802endif # need-config 803 804KBUILD_CFLAGS += -fno-delete-null-pointer-checks 805 806ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 807KBUILD_CFLAGS += -O2 808KBUILD_RUSTFLAGS += -Copt-level=2 809else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 810KBUILD_CFLAGS += -Os 811KBUILD_RUSTFLAGS += -Copt-level=s 812endif 813 814# Always set `debug-assertions` and `overflow-checks` because their default 815# depends on `opt-level` and `debug-assertions`, respectively. 816KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 817KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 818 819# Tell gcc to never replace conditional load with a non-conditional one 820ifdef CONFIG_CC_IS_GCC 821# gcc-10 renamed --param=allow-store-data-races=0 to 822# -fno-allow-store-data-races. 823KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 824KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 825endif 826 827ifdef CONFIG_READABLE_ASM 828# Disable optimizations that make assembler listings hard to read. 829# reorder blocks reorders the control in the function 830# ipa clone creates specialized cloned functions 831# partial inlining inlines only parts of functions 832KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 833endif 834 835stackp-flags-y := -fno-stack-protector 836stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 837stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 838 839KBUILD_CFLAGS += $(stackp-flags-y) 840 841KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 842KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 843 844ifdef CONFIG_FRAME_POINTER 845KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 846KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 847else 848# Some targets (ARM with Thumb2, for example), can't be built with frame 849# pointers. For those, we don't have FUNCTION_TRACER automatically 850# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 851# incompatible with -fomit-frame-pointer with current GCC, so we don't use 852# -fomit-frame-pointer with FUNCTION_TRACER. 853# In the Rust target specification, "frame-pointer" is set explicitly 854# to "may-omit". 855ifndef CONFIG_FUNCTION_TRACER 856KBUILD_CFLAGS += -fomit-frame-pointer 857endif 858endif 859 860# Initialize all stack variables with a 0xAA pattern. 861ifdef CONFIG_INIT_STACK_ALL_PATTERN 862KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 863endif 864 865# Initialize all stack variables with a zero value. 866ifdef CONFIG_INIT_STACK_ALL_ZERO 867KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 868ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 869# https://github.com/llvm/llvm-project/issues/44842 870CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 871export CC_AUTO_VAR_INIT_ZERO_ENABLER 872KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 873endif 874endif 875 876# While VLAs have been removed, GCC produces unreachable stack probes 877# for the randomize_kstack_offset feature. Disable it for all compilers. 878KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 879 880# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 881ifdef CONFIG_ZERO_CALL_USED_REGS 882KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 883endif 884 885ifdef CONFIG_FUNCTION_TRACER 886ifdef CONFIG_FTRACE_MCOUNT_USE_CC 887 CC_FLAGS_FTRACE += -mrecord-mcount 888 ifdef CONFIG_HAVE_NOP_MCOUNT 889 ifeq ($(call cc-option-yn, -mnop-mcount),y) 890 CC_FLAGS_FTRACE += -mnop-mcount 891 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 892 endif 893 endif 894endif 895ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 896 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 897 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 898 endif 899endif 900ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 901 ifdef CONFIG_HAVE_C_RECORDMCOUNT 902 BUILD_C_RECORDMCOUNT := y 903 export BUILD_C_RECORDMCOUNT 904 endif 905endif 906ifdef CONFIG_HAVE_FENTRY 907 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 908 ifeq ($(call cc-option-yn, -mfentry),y) 909 CC_FLAGS_FTRACE += -mfentry 910 CC_FLAGS_USING += -DCC_USING_FENTRY 911 endif 912endif 913export CC_FLAGS_FTRACE 914KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 915KBUILD_AFLAGS += $(CC_FLAGS_USING) 916endif 917 918# We trigger additional mismatches with less inlining 919ifdef CONFIG_DEBUG_SECTION_MISMATCH 920KBUILD_CFLAGS += -fno-inline-functions-called-once 921endif 922 923# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 924ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 925KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 926KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 927LDFLAGS_vmlinux += --gc-sections 928endif 929 930ifdef CONFIG_SHADOW_CALL_STACK 931ifndef CONFIG_DYNAMIC_SCS 932CC_FLAGS_SCS := -fsanitize=shadow-call-stack 933KBUILD_CFLAGS += $(CC_FLAGS_SCS) 934KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 935endif 936export CC_FLAGS_SCS 937endif 938 939ifdef CONFIG_LTO_CLANG 940ifdef CONFIG_LTO_CLANG_THIN 941CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 942else 943CC_FLAGS_LTO := -flto 944endif 945CC_FLAGS_LTO += -fvisibility=hidden 946 947# Limit inlining across translation units to reduce binary size 948KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 949endif 950 951ifdef CONFIG_LTO 952KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 953KBUILD_AFLAGS += -fno-lto 954export CC_FLAGS_LTO 955endif 956 957ifdef CONFIG_CFI_CLANG 958CC_FLAGS_CFI := -fsanitize=kcfi 959ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 960 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 961endif 962ifdef CONFIG_RUST 963 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 964 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 965 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 966 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 967 export RUSTC_FLAGS_CFI 968endif 969KBUILD_CFLAGS += $(CC_FLAGS_CFI) 970export CC_FLAGS_CFI 971endif 972 973# Architectures can define flags to add/remove for floating-point support 974CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 975export CC_FLAGS_FPU 976export CC_FLAGS_NO_FPU 977 978ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 979# Set the minimal function alignment. Use the newer GCC option 980# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 981# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 982ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 983KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 984else 985KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 986endif 987endif 988 989# arch Makefile may override CC so keep this after arch Makefile is included 990NOSTDINC_FLAGS += -nostdinc 991 992# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 993# the kernel uses only C99 flexible arrays for dynamically sized trailing 994# arrays. Enforce this for everything that may examine structure sizes and 995# perform bounds checking. 996KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 997 998#Currently, disable -Wstringop-overflow for GCC 11, globally. 999KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1000KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1001 1002# disable invalid "can't wrap" optimizations for signed / pointers 1003KBUILD_CFLAGS += -fno-strict-overflow 1004 1005# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1006KBUILD_CFLAGS += -fno-stack-check 1007 1008# conserve stack if available 1009ifdef CONFIG_CC_IS_GCC 1010KBUILD_CFLAGS += -fconserve-stack 1011endif 1012 1013# change __FILE__ to the relative path from the srctree 1014KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1015 1016# include additional Makefiles when needed 1017include-y := scripts/Makefile.extrawarn 1018include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1019include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1020include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1021include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1022include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1023include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1024include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1025include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1026include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1027 1028include $(addprefix $(srctree)/, $(include-y)) 1029 1030# scripts/Makefile.gcc-plugins is intentionally included last. 1031# Do not add $(call cc-option,...) below this line. When you build the kernel 1032# from the clean source tree, the GCC plugins do not exist at this point. 1033 1034# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1035KBUILD_CPPFLAGS += $(KCPPFLAGS) 1036KBUILD_AFLAGS += $(KAFLAGS) 1037KBUILD_CFLAGS += $(KCFLAGS) 1038KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1039 1040KBUILD_LDFLAGS_MODULE += --build-id=sha1 1041LDFLAGS_vmlinux += --build-id=sha1 1042 1043KBUILD_LDFLAGS += -z noexecstack 1044ifeq ($(CONFIG_LD_IS_BFD),y) 1045KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1046endif 1047 1048ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1049LDFLAGS_vmlinux += -X 1050endif 1051 1052ifeq ($(CONFIG_RELR),y) 1053# ld.lld before 15 did not support -z pack-relative-relocs. 1054LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1055endif 1056 1057# We never want expected sections to be placed heuristically by the 1058# linker. All sections should be explicitly named in the linker script. 1059ifdef CONFIG_LD_ORPHAN_WARN 1060LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1061endif 1062 1063# Align the bit size of userspace programs with the kernel 1064KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1065KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1066 1067# make the checker run with the right architecture 1068CHECKFLAGS += --arch=$(ARCH) 1069 1070# insure the checker run with the right endianness 1071CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1072 1073# the checker needs the correct machine size 1074CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1075 1076# Default kernel image to build when no specific target is given. 1077# KBUILD_IMAGE may be overruled on the command line or 1078# set in the environment 1079# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1080# this default value 1081export KBUILD_IMAGE ?= vmlinux 1082 1083# 1084# INSTALL_PATH specifies where to place the updated kernel and system map 1085# images. Default is /boot, but you can set it to other values 1086export INSTALL_PATH ?= /boot 1087 1088# 1089# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1090# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1091# an argument if needed. Otherwise it defaults to the kernel install path 1092# 1093export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1094 1095# 1096# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1097# relocations required by build roots. This is not defined in the 1098# makefile but the argument can be passed to make if needed. 1099# 1100 1101MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1102export MODLIB 1103 1104PHONY += prepare0 1105 1106export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1107export MODORDER := $(extmod_prefix)modules.order 1108export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1109 1110ifeq ($(KBUILD_EXTMOD),) 1111 1112build-dir := . 1113clean-dirs := $(sort . Documentation \ 1114 $(patsubst %/,%,$(filter %/, $(core-) \ 1115 $(drivers-) $(libs-)))) 1116 1117export ARCH_CORE := $(core-y) 1118export ARCH_LIB := $(filter %/, $(libs-y)) 1119export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1120# Externally visible symbols (used by link-vmlinux.sh) 1121 1122KBUILD_VMLINUX_OBJS := ./built-in.a 1123ifdef CONFIG_MODULES 1124KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1125KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1126else 1127KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1128endif 1129 1130export KBUILD_VMLINUX_LIBS 1131export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1132 1133ifdef CONFIG_TRIM_UNUSED_KSYMS 1134# For the kernel to actually contain only the needed exported symbols, 1135# we have to build modules as well to determine what those symbols are. 1136KBUILD_MODULES := 1 1137endif 1138 1139# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1140quiet_cmd_ar_vmlinux.a = AR $@ 1141 cmd_ar_vmlinux.a = \ 1142 rm -f $@; \ 1143 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1144 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1145 1146targets += vmlinux.a 1147vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1148 $(call if_changed,ar_vmlinux.a) 1149 1150PHONY += vmlinux_o 1151vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1152 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1153 1154vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1155 @: 1156 1157PHONY += vmlinux 1158# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1159# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1160# unrelated; the decompressors just happen to have the same base name, 1161# arch/*/boot/compressed/vmlinux. 1162# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1163# 1164# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1165# https://savannah.gnu.org/bugs/?61463 1166# For Make > 4.4, the following simple code will work: 1167# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1168vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1169vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1170vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1172 1173# The actual objects are generated when descending, 1174# make sure no implicit rule kicks in 1175$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1176 1177ifeq ($(origin KERNELRELEASE),file) 1178filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1179else 1180filechk_kernel.release = echo $(KERNELRELEASE) 1181endif 1182 1183# Store (new) KERNELRELEASE string in include/config/kernel.release 1184include/config/kernel.release: FORCE 1185 $(call filechk,kernel.release) 1186 1187# Additional helpers built in scripts/ 1188# Carefully list dependencies so we do not try to build scripts twice 1189# in parallel 1190PHONY += scripts 1191scripts: scripts_basic scripts_dtc 1192 $(Q)$(MAKE) $(build)=$(@) 1193 1194# Things we need to do before we recursively start building the kernel 1195# or the modules are listed in "prepare". 1196# A multi level approach is used. prepareN is processed before prepareN-1. 1197# archprepare is used in arch Makefiles and when processed asm symlink, 1198# version.h and scripts_basic is processed / created. 1199 1200PHONY += prepare archprepare 1201 1202archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1203 asm-generic $(version_h) include/generated/utsrelease.h \ 1204 include/generated/compile.h include/generated/autoconf.h \ 1205 include/generated/rustc_cfg remove-stale-files 1206 1207prepare0: archprepare 1208 $(Q)$(MAKE) $(build)=scripts/mod 1209 $(Q)$(MAKE) $(build)=. prepare 1210 1211# All the preparing.. 1212prepare: prepare0 1213ifdef CONFIG_RUST 1214 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1215 $(Q)$(MAKE) $(build)=rust 1216endif 1217 1218PHONY += remove-stale-files 1219remove-stale-files: 1220 $(Q)$(srctree)/scripts/remove-stale-files 1221 1222# Support for using generic headers in asm-generic 1223asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1224 1225PHONY += asm-generic uapi-asm-generic 1226asm-generic: uapi-asm-generic 1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1228 generic=include/asm-generic 1229uapi-asm-generic: 1230 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1231 generic=include/uapi/asm-generic 1232 1233# Generate some files 1234# --------------------------------------------------------------------------- 1235 1236# KERNELRELEASE can change from a few different places, meaning version.h 1237# needs to be updated, so this check is forced on all builds 1238 1239uts_len := 64 1240define filechk_utsrelease.h 1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1243 exit 1; \ 1244 fi; \ 1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1246endef 1247 1248define filechk_version.h 1249 if [ $(SUBLEVEL) -gt 255 ]; then \ 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1252 else \ 1253 echo \#define LINUX_VERSION_CODE $(shell \ 1254 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1255 fi; \ 1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1257 ((c) > 255 ? 255 : (c)))'; \ 1258 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1259 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1260 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1261endef 1262 1263$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1264$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1265$(version_h): FORCE 1266 $(call filechk,version.h) 1267 1268include/generated/utsrelease.h: include/config/kernel.release FORCE 1269 $(call filechk,utsrelease.h) 1270 1271filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1272 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1273 1274include/generated/compile.h: FORCE 1275 $(call filechk,compile.h) 1276 1277PHONY += headerdep 1278headerdep: 1279 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1280 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1281 1282# --------------------------------------------------------------------------- 1283# Kernel headers 1284 1285#Default location for installed headers 1286export INSTALL_HDR_PATH = $(objtree)/usr 1287 1288quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1289 cmd_headers_install = \ 1290 mkdir -p $(INSTALL_HDR_PATH); \ 1291 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1292 usr/include $(INSTALL_HDR_PATH) 1293 1294PHONY += headers_install 1295headers_install: headers 1296 $(call cmd,headers_install) 1297 1298PHONY += archheaders archscripts 1299 1300hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1301 1302PHONY += headers 1303headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1304 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1305 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1306 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1307 1308ifdef CONFIG_HEADERS_INSTALL 1309prepare: headers 1310endif 1311 1312PHONY += scripts_unifdef 1313scripts_unifdef: scripts_basic 1314 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1315 1316# --------------------------------------------------------------------------- 1317# Install 1318 1319# Many distributions have the custom install script, /sbin/installkernel. 1320# If DKMS is installed, 'make install' will eventually recurse back 1321# to this Makefile to build and install external modules. 1322# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1323 1324quiet_cmd_install = INSTALL $(INSTALL_PATH) 1325 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1326 1327# --------------------------------------------------------------------------- 1328# vDSO install 1329 1330PHONY += vdso_install 1331vdso_install: export INSTALL_FILES = $(vdso-install-y) 1332vdso_install: 1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1334 1335# --------------------------------------------------------------------------- 1336# Tools 1337 1338ifdef CONFIG_OBJTOOL 1339prepare: tools/objtool 1340endif 1341 1342ifdef CONFIG_BPF 1343ifdef CONFIG_DEBUG_INFO_BTF 1344prepare: tools/bpf/resolve_btfids 1345endif 1346endif 1347 1348# The tools build system is not a part of Kbuild and tends to introduce 1349# its own unique issues. If you need to integrate a new tool into Kbuild, 1350# please consider locating that tool outside the tools/ tree and using the 1351# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1352# here. See Documentation/kbuild/makefiles.rst for details. 1353 1354PHONY += resolve_btfids_clean 1355 1356resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1357 1358# tools/bpf/resolve_btfids directory might not exist 1359# in output directory, skip its clean in that case 1360resolve_btfids_clean: 1361ifneq ($(wildcard $(resolve_btfids_O)),) 1362 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1363endif 1364 1365# Clear a bunch of variables before executing the submake 1366ifeq ($(quiet),silent_) 1367tools_silent=s 1368endif 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 1374tools/%: FORCE 1375 $(Q)mkdir -p $(objtree)/tools 1376 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1377 1378# --------------------------------------------------------------------------- 1379# Kernel selftest 1380 1381PHONY += kselftest 1382kselftest: headers 1383 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1384 1385kselftest-%: headers FORCE 1386 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1387 1388PHONY += kselftest-merge 1389kselftest-merge: 1390 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1391 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1392 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1393 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1394 1395# --------------------------------------------------------------------------- 1396# Devicetree files 1397 1398ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1399dtstree := arch/$(SRCARCH)/boot/dts 1400endif 1401 1402ifneq ($(dtstree),) 1403 1404%.dtb: dtbs_prepare 1405 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1406 1407%.dtbo: dtbs_prepare 1408 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1409 1410PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1411dtbs: dtbs_prepare 1412 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1413 1414# include/config/kernel.release is actually needed when installing DTBs because 1415# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1416# dtbs_install depend on it as dtbs_install may run as root. 1417dtbs_prepare: include/config/kernel.release scripts_dtc 1418 1419ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1420export CHECK_DTBS=y 1421endif 1422 1423ifneq ($(CHECK_DTBS),) 1424dtbs_prepare: dt_binding_schemas 1425endif 1426 1427dtbs_check: dtbs 1428 1429dtbs_install: 1430 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1431 1432ifdef CONFIG_OF_EARLY_FLATTREE 1433all: dtbs 1434endif 1435 1436ifdef CONFIG_GENERIC_BUILTIN_DTB 1437vmlinux: dtbs 1438endif 1439 1440endif 1441 1442PHONY += scripts_dtc 1443scripts_dtc: scripts_basic 1444 $(Q)$(MAKE) $(build)=scripts/dtc 1445 1446ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1447export CHECK_DTBS=y 1448endif 1449 1450PHONY += dt_binding_check dt_binding_schemas 1451dt_binding_check: dt_binding_schemas scripts_dtc 1452 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1453 1454dt_binding_schemas: 1455 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1456 1457PHONY += dt_compatible_check 1458dt_compatible_check: dt_binding_schemas 1459 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1460 1461# --------------------------------------------------------------------------- 1462# Modules 1463 1464ifdef CONFIG_MODULES 1465 1466# By default, build modules as well 1467 1468all: modules 1469 1470# When we're building modules with modversions, we need to consider 1471# the built-in objects during the descend as well, in order to 1472# make sure the checksums are up to date before we record them. 1473ifdef CONFIG_MODVERSIONS 1474 KBUILD_BUILTIN := 1 1475endif 1476 1477# Build modules 1478# 1479 1480# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1481# is an exception. 1482ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1483KBUILD_BUILTIN := 1 1484modules: vmlinux 1485endif 1486 1487modules: modules_prepare 1488 1489# Target to prepare building external modules 1490modules_prepare: prepare 1491 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1492 1493endif # CONFIG_MODULES 1494 1495### 1496# Cleaning is done on three levels. 1497# make clean Delete most generated files 1498# Leave enough to build external modules 1499# make mrproper Delete the current configuration, and all generated files 1500# make distclean Remove editor backup files, patch leftover files and the like 1501 1502# Directories & files removed with 'make clean' 1503CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1504 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1505 modules.builtin.ranges vmlinux.o.map \ 1506 compile_commands.json rust/test \ 1507 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1508 .builtin-dtbs-list .builtin-dtb.S 1509 1510# Directories & files removed with 'make mrproper' 1511MRPROPER_FILES += include/config include/generated \ 1512 arch/$(SRCARCH)/include/generated .objdiff \ 1513 debian snap tar-install PKGBUILD pacman \ 1514 .config .config.old .version \ 1515 Module.symvers \ 1516 certs/signing_key.pem \ 1517 certs/x509.genkey \ 1518 vmlinux-gdb.py \ 1519 rpmbuild \ 1520 rust/libmacros.so 1521 1522# clean - Delete most, but leave enough to build external modules 1523# 1524clean: private rm-files := $(CLEAN_FILES) 1525 1526PHONY += archclean vmlinuxclean 1527 1528vmlinuxclean: 1529 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1530 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1531 1532clean: archclean vmlinuxclean resolve_btfids_clean 1533 1534# mrproper - Delete all generated files, including .config 1535# 1536mrproper: private rm-files := $(MRPROPER_FILES) 1537mrproper-dirs := $(addprefix _mrproper_,scripts) 1538 1539PHONY += $(mrproper-dirs) mrproper 1540$(mrproper-dirs): 1541 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1542 1543mrproper: clean $(mrproper-dirs) 1544 $(call cmd,rmfiles) 1545 @find . $(RCS_FIND_IGNORE) \ 1546 \( -name '*.rmeta' \) \ 1547 -type f -print | xargs rm -f 1548 1549# distclean 1550# 1551PHONY += distclean 1552 1553distclean: mrproper 1554 @find . $(RCS_FIND_IGNORE) \ 1555 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1556 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1557 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1558 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1559 -type f -print | xargs rm -f 1560 1561 1562# Packaging of the kernel to various formats 1563# --------------------------------------------------------------------------- 1564 1565%src-pkg: FORCE 1566 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1567%pkg: include/config/kernel.release FORCE 1568 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1569 1570# Brief documentation of the typical targets used 1571# --------------------------------------------------------------------------- 1572 1573boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1574boards := $(sort $(notdir $(boards))) 1575board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1576board-dirs := $(sort $(notdir $(board-dirs:/=))) 1577 1578PHONY += help 1579help: 1580 @echo 'Cleaning targets:' 1581 @echo ' clean - Remove most generated files but keep the config and' 1582 @echo ' enough build support to build external modules' 1583 @echo ' mrproper - Remove all generated files + config + various backup files' 1584 @echo ' distclean - mrproper + remove editor backup and patch files' 1585 @echo '' 1586 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1587 @echo '' 1588 @echo 'Other generic targets:' 1589 @echo ' all - Build all targets marked with [*]' 1590 @echo '* vmlinux - Build the bare kernel' 1591 @echo '* modules - Build all modules' 1592 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1593 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1594 @echo ' dir/ - Build all files in dir and below' 1595 @echo ' dir/file.[ois] - Build specified target only' 1596 @echo ' dir/file.ll - Build the LLVM assembly file' 1597 @echo ' (requires compiler support for LLVM assembly generation)' 1598 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1599 @echo ' (requires a recent binutils and recent build (System.map))' 1600 @echo ' dir/file.ko - Build module including final link' 1601 @echo ' modules_prepare - Set up for building external modules' 1602 @echo ' tags/TAGS - Generate tags file for editors' 1603 @echo ' cscope - Generate cscope index' 1604 @echo ' gtags - Generate GNU GLOBAL index' 1605 @echo ' kernelrelease - Output the release version string (use with make -s)' 1606 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1607 @echo ' image_name - Output the image name (use with make -s)' 1608 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1609 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1610 echo '' 1611 @echo 'Static analysers:' 1612 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1613 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1614 @echo ' versioncheck - Sanity check on version.h usage' 1615 @echo ' includecheck - Check for duplicate included header files' 1616 @echo ' export_report - List the usages of all exported symbols' 1617 @echo ' headerdep - Detect inclusion cycles in headers' 1618 @echo ' coccicheck - Check with Coccinelle' 1619 @echo ' clang-analyzer - Check with clang static analyzer' 1620 @echo ' clang-tidy - Check with clang-tidy' 1621 @echo '' 1622 @echo 'Tools:' 1623 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1624 @echo '' 1625 @echo 'Kernel selftest:' 1626 @echo ' kselftest - Build and run kernel selftest' 1627 @echo ' Build, install, and boot kernel before' 1628 @echo ' running kselftest on it' 1629 @echo ' Run as root for full coverage' 1630 @echo ' kselftest-all - Build kernel selftest' 1631 @echo ' kselftest-install - Build and install kernel selftest' 1632 @echo ' kselftest-clean - Remove all generated kselftest files' 1633 @echo ' kselftest-merge - Merge all the config dependencies of' 1634 @echo ' kselftest to existing .config.' 1635 @echo '' 1636 @echo 'Rust targets:' 1637 @echo ' rustavailable - Checks whether the Rust toolchain is' 1638 @echo ' available and, if not, explains why.' 1639 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1640 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1641 @echo ' is formatted, printing a diff otherwise.' 1642 @echo ' rustdoc - Generate Rust documentation' 1643 @echo ' (requires kernel .config)' 1644 @echo ' rusttest - Runs the Rust tests' 1645 @echo ' (requires kernel .config; downloads external repos)' 1646 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1647 @echo ' (requires kernel .config)' 1648 @echo ' dir/file.[os] - Build specified target only' 1649 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1650 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1651 @echo ' The output is not intended to be compilable.' 1652 @echo ' dir/file.ll - Build the LLVM assembly file' 1653 @echo '' 1654 @$(if $(dtstree), \ 1655 echo 'Devicetree:'; \ 1656 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1657 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1658 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1659 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1660 echo ' dtbs_check - Validate device tree source files';\ 1661 echo '') 1662 1663 @echo 'Userspace tools targets:' 1664 @echo ' use "make tools/help"' 1665 @echo ' or "cd tools; make help"' 1666 @echo '' 1667 @echo 'Kernel packaging:' 1668 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1669 @echo '' 1670 @echo 'Documentation targets:' 1671 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1672 @echo '' 1673 @echo 'Architecture-specific targets ($(SRCARCH)):' 1674 @$(or $(archhelp),\ 1675 echo ' No architecture-specific help defined for $(SRCARCH)') 1676 @echo '' 1677 @$(if $(boards), \ 1678 $(foreach b, $(boards), \ 1679 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1680 echo '') 1681 @$(if $(board-dirs), \ 1682 $(foreach b, $(board-dirs), \ 1683 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1684 printf " %-16s - Show all of the above\\n" help-boards; \ 1685 echo '') 1686 1687 @echo ' make V=n [targets] 1: verbose build' 1688 @echo ' 2: give reason for rebuild of target' 1689 @echo ' V=1 and V=2 can be combined with V=12' 1690 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1691 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1692 @echo ' (sparse by default)' 1693 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1694 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1695 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1696 @echo ' 1: warnings which may be relevant and do not occur too often' 1697 @echo ' 2: warnings which occur quite often but may still be relevant' 1698 @echo ' 3: more obscure warnings, can most likely be ignored' 1699 @echo ' c: extra checks in the configuration stage (Kconfig)' 1700 @echo ' e: warnings are being treated as errors' 1701 @echo ' Multiple levels can be combined with W=12 or W=123' 1702 @$(if $(dtstree), \ 1703 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1704 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1705 ) 1706 @echo '' 1707 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1708 @echo 'For further info see the ./README file' 1709 1710 1711help-board-dirs := $(addprefix help-,$(board-dirs)) 1712 1713help-boards: $(help-board-dirs) 1714 1715boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1716 1717$(help-board-dirs): help-%: 1718 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1719 @$(if $(boards-per-dir), \ 1720 $(foreach b, $(boards-per-dir), \ 1721 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1722 echo '') 1723 1724 1725# Documentation targets 1726# --------------------------------------------------------------------------- 1727DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1728 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1729PHONY += $(DOC_TARGETS) 1730$(DOC_TARGETS): 1731 $(Q)$(MAKE) $(build)=Documentation $@ 1732 1733 1734# Rust targets 1735# --------------------------------------------------------------------------- 1736 1737# "Is Rust available?" target 1738PHONY += rustavailable 1739rustavailable: 1740 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1741 1742# Documentation target 1743# 1744# Using the singular to avoid running afoul of `no-dot-config-targets`. 1745PHONY += rustdoc 1746rustdoc: prepare 1747 $(Q)$(MAKE) $(build)=rust $@ 1748 1749# Testing target 1750PHONY += rusttest 1751rusttest: prepare 1752 $(Q)$(MAKE) $(build)=rust $@ 1753 1754# Formatting targets 1755PHONY += rustfmt rustfmtcheck 1756 1757# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1758# 1759# We match using absolute paths since `find` does not resolve them 1760# when matching, which is a problem when e.g. `srctree` is `..`. 1761# We `grep` afterwards in order to remove the directory entry itself. 1762rustfmt: 1763 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1764 -o -path $(abs_srctree)/rust/alloc -prune \ 1765 -o -path $(abs_objtree)/rust/test -prune \ 1766 | grep -Fv $(abs_srctree)/rust/alloc \ 1767 | grep -Fv $(abs_objtree)/rust/test \ 1768 | grep -Fv generated \ 1769 | xargs $(RUSTFMT) $(rustfmt_flags) 1770 1771rustfmtcheck: rustfmt_flags = --check 1772rustfmtcheck: rustfmt 1773 1774# Misc 1775# --------------------------------------------------------------------------- 1776 1777PHONY += misc-check 1778misc-check: 1779 $(Q)$(srctree)/scripts/misc-check 1780 1781all: misc-check 1782 1783PHONY += scripts_gdb 1784scripts_gdb: prepare0 1785 $(Q)$(MAKE) $(build)=scripts/gdb 1786 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1787 1788ifdef CONFIG_GDB_SCRIPTS 1789all: scripts_gdb 1790endif 1791 1792else # KBUILD_EXTMOD 1793 1794filechk_kernel.release = echo $(KERNELRELEASE) 1795 1796### 1797# External module support. 1798# When building external modules the kernel used as basis is considered 1799# read-only, and no consistency checks are made and the make 1800# system is not used on the basis kernel. If updates are required 1801# in the basis kernel ordinary make commands (without M=...) must be used. 1802 1803# We are always building only modules. 1804KBUILD_BUILTIN := 1805KBUILD_MODULES := 1 1806 1807build-dir := $(KBUILD_EXTMOD) 1808 1809compile_commands.json: $(extmod_prefix)compile_commands.json 1810PHONY += compile_commands.json 1811 1812clean-dirs := $(KBUILD_EXTMOD) 1813clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1814 $(KBUILD_EXTMOD)/compile_commands.json 1815 1816PHONY += prepare 1817# now expand this into a simple variable to reduce the cost of shell evaluations 1818prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1819prepare: 1820 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1821 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1822 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1823 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1824 fi 1825 1826PHONY += help 1827help: 1828 @echo ' Building external modules.' 1829 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1830 @echo '' 1831 @echo ' modules - default target, build the module(s)' 1832 @echo ' modules_install - install the module' 1833 @echo ' clean - remove generated files in module directory only' 1834 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1835 @echo '' 1836 1837ifndef CONFIG_MODULES 1838modules modules_install: __external_modules_error 1839__external_modules_error: 1840 @echo >&2 '***' 1841 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1842 @echo >&2 '*** You cannot build or install external modules.' 1843 @echo >&2 '***' 1844 @false 1845endif 1846 1847endif # KBUILD_EXTMOD 1848 1849# --------------------------------------------------------------------------- 1850# Modules 1851 1852PHONY += modules modules_install modules_sign modules_prepare 1853 1854modules_install: 1855 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1856 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1857 1858ifeq ($(CONFIG_MODULE_SIG),y) 1859# modules_sign is a subset of modules_install. 1860# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1861modules_sign: modules_install 1862 @: 1863else 1864modules_sign: 1865 @echo >&2 '***' 1866 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1867 @echo >&2 '***' 1868 @false 1869endif 1870 1871ifdef CONFIG_MODULES 1872 1873$(MODORDER): $(build-dir) 1874 @: 1875 1876# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1877# This is solely useful to speed up test compiles. 1878modules: modpost 1879ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1880 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1881endif 1882 1883PHONY += modules_check 1884modules_check: $(MODORDER) 1885 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1886 1887else # CONFIG_MODULES 1888 1889modules: 1890 @: 1891 1892KBUILD_MODULES := 1893 1894endif # CONFIG_MODULES 1895 1896PHONY += modpost 1897modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1898 $(if $(KBUILD_MODULES), modules_check) 1899 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1900 1901# Single targets 1902# --------------------------------------------------------------------------- 1903# To build individual files in subdirectories, you can do like this: 1904# 1905# make foo/bar/baz.s 1906# 1907# The supported suffixes for single-target are listed in 'single-targets' 1908# 1909# To build only under specific subdirectories, you can do like this: 1910# 1911# make foo/bar/baz/ 1912 1913ifdef single-build 1914 1915# .ko is special because modpost is needed 1916single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1917single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1918 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1919 1920$(single-ko): single_modules 1921 @: 1922$(single-no-ko): $(build-dir) 1923 @: 1924 1925# Remove MODORDER when done because it is not the real one. 1926PHONY += single_modules 1927single_modules: $(single-no-ko) modules_prepare 1928 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1929 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1930ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1931 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1932endif 1933 $(Q)rm -f $(MODORDER) 1934 1935single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1936 1937KBUILD_MODULES := 1 1938 1939endif 1940 1941# Preset locale variables to speed up the build process. Limit locale 1942# tweaks to this spot to avoid wrong language settings when running 1943# make menuconfig etc. 1944# Error messages still appears in the original language 1945PHONY += $(build-dir) 1946$(build-dir): prepare 1947 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1948 1949clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1950PHONY += $(clean-dirs) clean 1951$(clean-dirs): 1952 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1953 1954clean: $(clean-dirs) 1955 $(call cmd,rmfiles) 1956 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1957 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1958 -o -name '*.ko.*' \ 1959 -o -name '*.dtb' -o -name '*.dtbo' \ 1960 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1961 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1962 -o -name '*.dwo' -o -name '*.lst' \ 1963 -o -name '*.su' -o -name '*.mod' \ 1964 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1965 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1966 -o -name '*.asn1.[ch]' \ 1967 -o -name '*.symtypes' -o -name 'modules.order' \ 1968 -o -name '*.c.[012]*.*' \ 1969 -o -name '*.ll' \ 1970 -o -name '*.gcno' \ 1971 \) -type f -print \ 1972 -o -name '.tmp_*' -print \ 1973 | xargs rm -rf 1974 1975# Generate tags for editors 1976# --------------------------------------------------------------------------- 1977quiet_cmd_tags = GEN $@ 1978 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1979 1980tags TAGS cscope gtags: FORCE 1981 $(call cmd,tags) 1982 1983# Generate rust-project.json (a file that describes the structure of non-Cargo 1984# Rust projects) for rust-analyzer (an implementation of the Language Server 1985# Protocol). 1986PHONY += rust-analyzer 1987rust-analyzer: 1988 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1989 $(Q)$(MAKE) $(build)=rust $@ 1990 1991# Script to generate missing namespace dependencies 1992# --------------------------------------------------------------------------- 1993 1994PHONY += nsdeps 1995nsdeps: export KBUILD_NSDEPS=1 1996nsdeps: modules 1997 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1998 1999# Clang Tooling 2000# --------------------------------------------------------------------------- 2001 2002quiet_cmd_gen_compile_commands = GEN $@ 2003 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2004 2005$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2006 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2007 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2008 $(call if_changed,gen_compile_commands) 2009 2010targets += $(extmod_prefix)compile_commands.json 2011 2012PHONY += clang-tidy clang-analyzer 2013 2014ifdef CONFIG_CC_IS_CLANG 2015quiet_cmd_clang_tools = CHECK $< 2016 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2017 2018clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2019 $(call cmd,clang_tools) 2020else 2021clang-tidy clang-analyzer: 2022 @echo "$@ requires CC=clang" >&2 2023 @false 2024endif 2025 2026# Scripts to check various things for consistency 2027# --------------------------------------------------------------------------- 2028 2029PHONY += includecheck versioncheck coccicheck export_report 2030 2031includecheck: 2032 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2033 -name '*.[hcS]' -type f -print | sort \ 2034 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2035 2036versioncheck: 2037 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2038 -name '*.[hcS]' -type f -print | sort \ 2039 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2040 2041coccicheck: 2042 $(Q)$(BASH) $(srctree)/scripts/$@ 2043 2044export_report: 2045 $(PERL) $(srctree)/scripts/export_report.pl 2046 2047PHONY += checkstack kernelrelease kernelversion image_name 2048 2049# UML needs a little special treatment here. It wants to use the host 2050# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2051# else wants $(ARCH), including people doing cross-builds, which means 2052# that $(SUBARCH) doesn't work here. 2053ifeq ($(ARCH), um) 2054CHECKSTACK_ARCH := $(SUBARCH) 2055else 2056CHECKSTACK_ARCH := $(ARCH) 2057endif 2058MINSTACKSIZE ?= 100 2059checkstack: 2060 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2061 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2062 2063kernelrelease: 2064 @$(filechk_kernel.release) 2065 2066kernelversion: 2067 @echo $(KERNELVERSION) 2068 2069image_name: 2070 @echo $(KBUILD_IMAGE) 2071 2072PHONY += run-command 2073run-command: 2074 $(Q)$(KBUILD_RUN_COMMAND) 2075 2076quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2077 cmd_rmfiles = rm -rf $(rm-files) 2078 2079# read saved command lines for existing targets 2080existing-targets := $(wildcard $(sort $(targets))) 2081 2082-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2083 2084endif # config-build 2085endif # mixed-build 2086endif # need-sub-make 2087 2088PHONY += FORCE 2089FORCE: 2090 2091# Declare the contents of the PHONY variable as phony. We keep that 2092# information in a variable so we can use it in if_changed and friends. 2093.PHONY: $(PHONY) 2094