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