1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 7 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Hurr durr I'ma ninja sloth 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 ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 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)) 42export abs_srctree := $(realpath $(dir $(this-makefile))) 43export abs_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, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 97 98ifeq ($(filter 3.%,$(MAKE_VERSION)),) 99short-opts := $(firstword -$(MAKEFLAGS)) 100else 101short-opts := $(filter-out --%,$(MAKEFLAGS)) 102endif 103 104ifneq ($(findstring s,$(short-opts)),) 105quiet=silent_ 106override KBUILD_VERBOSE := 107endif 108 109export quiet Q KBUILD_VERBOSE 110 111# Call a source code checker (by default, "sparse") as part of the 112# C compilation. 113# 114# Use 'make C=1' to enable checking of only re-compiled files. 115# Use 'make C=2' to enable checking of *all* source files, regardless 116# of whether they are re-compiled or not. 117# 118# See the file "Documentation/dev-tools/sparse.rst" for more details, 119# including where to get the "sparse" utility. 120 121ifeq ("$(origin C)", "command line") 122 KBUILD_CHECKSRC = $(C) 123endif 124ifndef KBUILD_CHECKSRC 125 KBUILD_CHECKSRC = 0 126endif 127 128export KBUILD_CHECKSRC 129 130# Enable "clippy" (a linter) as part of the Rust compilation. 131# 132# Use 'make CLIPPY=1' to enable it. 133ifeq ("$(origin CLIPPY)", "command line") 134 KBUILD_CLIPPY := $(CLIPPY) 135endif 136 137export KBUILD_CLIPPY 138 139# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 140# directory of external module to build. Setting M= takes precedence. 141ifeq ("$(origin M)", "command line") 142 KBUILD_EXTMOD := $(M) 143endif 144 145$(if $(word 2, $(KBUILD_EXTMOD)), \ 146 $(error building multiple external modules is not supported)) 147 148$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 149 $(error module directory path cannot contain '$x'))) 150 151# Remove trailing slashes 152ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 153KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 154endif 155 156export KBUILD_EXTMOD 157 158# Kbuild will save output files in the current working directory. 159# This does not need to match to the root of the kernel source tree. 160# 161# For example, you can do this: 162# 163# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 164# 165# If you want to save output files in a different location, there are 166# two syntaxes to specify it. 167# 168# 1) O= 169# Use "make O=dir/to/store/output/files/" 170# 171# 2) Set KBUILD_OUTPUT 172# Set the environment variable KBUILD_OUTPUT to point to the output directory. 173# export KBUILD_OUTPUT=dir/to/store/output/files/; make 174# 175# The O= assignment takes precedence over the KBUILD_OUTPUT environment 176# variable. 177 178# Do we want to change the working directory? 179ifeq ("$(origin O)", "command line") 180 KBUILD_OUTPUT := $(O) 181endif 182 183ifneq ($(KBUILD_OUTPUT),) 184# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 185# expand a shell special character '~'. We use a somewhat tedious way here. 186abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 187$(if $(abs_objtree),, \ 188 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 189 190# $(realpath ...) resolves symlinks 191abs_objtree := $(realpath $(abs_objtree)) 192endif # ifneq ($(KBUILD_OUTPUT),) 193 194ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 195$(error source directory cannot contain spaces or colons) 196endif 197 198ifneq ($(filter 3.%,$(MAKE_VERSION)),) 199# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 200# We need to invoke sub-make to avoid implicit rules in the top Makefile. 201need-sub-make := 1 202# Cancel implicit rules for this Makefile. 203$(this-makefile): ; 204endif 205 206export sub_make_done := 1 207 208endif # sub_make_done 209 210ifeq ($(abs_objtree),$(CURDIR)) 211# Suppress "Entering directory ..." if we are at the final work directory. 212no-print-directory := --no-print-directory 213else 214# Recursion to show "Entering directory ..." 215need-sub-make := 1 216endif 217 218ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 219# If --no-print-directory is unset, recurse once again to set it. 220# You may end up recursing into __sub-make twice. This is needed due to the 221# behavior change in GNU Make 4.4.1. 222need-sub-make := 1 223endif 224 225ifeq ($(need-sub-make),1) 226 227PHONY += $(MAKECMDGOALS) __sub-make 228 229$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 230 @: 231 232# Invoke a second make in the output directory, passing relevant variables 233__sub-make: 234 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 235 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 236 237else # need-sub-make 238 239# We process the rest of the Makefile if this is the final invocation of make 240 241ifeq ($(abs_srctree),$(abs_objtree)) 242 # building in the source tree 243 srctree := . 244 building_out_of_srctree := 245else 246 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 247 # building in a subdirectory of the source tree 248 srctree := .. 249 else 250 srctree := $(abs_srctree) 251 endif 252 building_out_of_srctree := 1 253endif 254 255ifneq ($(KBUILD_ABS_SRCTREE),) 256srctree := $(abs_srctree) 257endif 258 259objtree := . 260VPATH := $(srctree) 261 262export building_out_of_srctree srctree objtree VPATH 263 264# To make sure we do not include .config for any of the *config targets 265# catch them early, and hand them over to scripts/kconfig/Makefile 266# It is allowed to specify more targets when calling make, including 267# mixing *config targets and build targets. 268# For example 'make oldconfig all'. 269# Detect when mixed targets is specified, and make a second invocation 270# of make so .config is not included in this case either (for *config). 271 272version_h := include/generated/uapi/linux/version.h 273 274clean-targets := %clean mrproper cleandocs 275no-dot-config-targets := $(clean-targets) \ 276 cscope gtags TAGS tags help% %docs check% coccicheck \ 277 $(version_h) headers headers_% archheaders archscripts \ 278 %asm-generic kernelversion %src-pkg dt_binding_check \ 279 outputmakefile rustavailable rustfmt rustfmtcheck 280no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 281 image_name 282single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 283 284config-build := 285mixed-build := 286need-config := 1 287may-sync-config := 1 288single-build := 289 290ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 291 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 292 need-config := 293 endif 294endif 295 296ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 297 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 298 may-sync-config := 299 endif 300endif 301 302need-compiler := $(may-sync-config) 303 304ifneq ($(KBUILD_EXTMOD),) 305 may-sync-config := 306endif 307 308ifeq ($(KBUILD_EXTMOD),) 309 ifneq ($(filter %config,$(MAKECMDGOALS)),) 310 config-build := 1 311 ifneq ($(words $(MAKECMDGOALS)),1) 312 mixed-build := 1 313 endif 314 endif 315endif 316 317# We cannot build single targets and the others at the same time 318ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 319 single-build := 1 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325# For "make -j clean all", "make -j mrproper defconfig all", etc. 326ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# install and modules_install need also be processed one by one 333ifneq ($(filter install,$(MAKECMDGOALS)),) 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339ifdef mixed-build 340# =========================================================================== 341# We're called with mixed targets (*config and build targets). 342# Handle them one by one. 343 344PHONY += $(MAKECMDGOALS) __build_one_by_one 345 346$(MAKECMDGOALS): __build_one_by_one 347 @: 348 349__build_one_by_one: 350 $(Q)set -e; \ 351 for i in $(MAKECMDGOALS); do \ 352 $(MAKE) -f $(srctree)/Makefile $$i; \ 353 done 354 355else # !mixed-build 356 357include $(srctree)/scripts/Kbuild.include 358 359# Read KERNELRELEASE from include/config/kernel.release (if it exists) 360KERNELRELEASE = $(call read-file, include/config/kernel.release) 361KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 363 364include $(srctree)/scripts/subarch.include 365 366# Cross compiling and selecting different set of gcc/bin-utils 367# --------------------------------------------------------------------------- 368# 369# When performing cross compilation for other architectures ARCH shall be set 370# to the target architecture. (See arch/* for the possibilities). 371# ARCH can be set during invocation of make: 372# make ARCH=arm64 373# Another way is to have ARCH set in the environment. 374# The default ARCH is the host where make is executed. 375 376# CROSS_COMPILE specify the prefix used for all executables used 377# during compilation. Only gcc and related bin-utils executables 378# are prefixed with $(CROSS_COMPILE). 379# CROSS_COMPILE can be set on the command line 380# make CROSS_COMPILE=aarch64-linux-gnu- 381# Alternatively CROSS_COMPILE can be set in the environment. 382# Default value for CROSS_COMPILE is not to prefix executables 383# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 384ARCH ?= $(SUBARCH) 385 386# Architecture as present in compile.h 387UTS_MACHINE := $(ARCH) 388SRCARCH := $(ARCH) 389 390# Additional ARCH settings for x86 391ifeq ($(ARCH),i386) 392 SRCARCH := x86 393endif 394ifeq ($(ARCH),x86_64) 395 SRCARCH := x86 396endif 397 398# Additional ARCH settings for sparc 399ifeq ($(ARCH),sparc32) 400 SRCARCH := sparc 401endif 402ifeq ($(ARCH),sparc64) 403 SRCARCH := sparc 404endif 405 406# Additional ARCH settings for parisc 407ifeq ($(ARCH),parisc64) 408 SRCARCH := parisc 409endif 410 411export cross_compiling := 412ifneq ($(SRCARCH),$(SUBARCH)) 413cross_compiling := 1 414endif 415 416KCONFIG_CONFIG ?= .config 417export KCONFIG_CONFIG 418 419# SHELL used by kbuild 420CONFIG_SHELL := sh 421 422HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 423HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 424HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 425 426ifneq ($(LLVM),) 427ifneq ($(filter %/,$(LLVM)),) 428LLVM_PREFIX := $(LLVM) 429else ifneq ($(filter -%,$(LLVM)),) 430LLVM_SUFFIX := $(LLVM) 431endif 432 433HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 434HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 435else 436HOSTCC = gcc 437HOSTCXX = g++ 438endif 439HOSTRUSTC = rustc 440HOSTPKG_CONFIG = pkg-config 441 442KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 443 -O2 -fomit-frame-pointer -std=gnu11 444KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 445KBUILD_USERLDFLAGS := $(USERLDFLAGS) 446 447# These flags apply to all Rust code in the tree, including the kernel and 448# host programs. 449export rust_common_flags := --edition=2021 \ 450 -Zbinary_dep_depinfo=y \ 451 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 452 -Dunreachable_pub -Dnon_ascii_idents \ 453 -Wmissing_docs \ 454 -Drustdoc::missing_crate_level_docs \ 455 -Dclippy::correctness -Dclippy::style \ 456 -Dclippy::suspicious -Dclippy::complexity \ 457 -Dclippy::perf \ 458 -Dclippy::let_unit_value -Dclippy::mut_mut \ 459 -Dclippy::needless_bitwise_bool \ 460 -Dclippy::needless_continue \ 461 -Dclippy::no_mangle_with_rust_abi \ 462 -Wclippy::dbg_macro 463 464KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 465KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 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 497CARGO = cargo 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 := $(rust_common_flags) \ 558 --target=$(objtree)/scripts/target.json \ 559 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 560 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 561 -Csymbol-mangling-version=v0 \ 562 -Crelocation-model=static \ 563 -Zfunction-sections=n \ 564 -Dclippy::float_arithmetic 565 566KBUILD_AFLAGS_KERNEL := 567KBUILD_CFLAGS_KERNEL := 568KBUILD_RUSTFLAGS_KERNEL := 569KBUILD_AFLAGS_MODULE := -DMODULE 570KBUILD_CFLAGS_MODULE := -DMODULE 571KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 572KBUILD_LDFLAGS_MODULE := 573KBUILD_LDFLAGS := 574CLANG_FLAGS := 575 576ifeq ($(KBUILD_CLIPPY),1) 577 RUSTC_OR_CLIPPY_QUIET := CLIPPY 578 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 579else 580 RUSTC_OR_CLIPPY_QUIET := RUSTC 581 RUSTC_OR_CLIPPY = $(RUSTC) 582endif 583 584ifdef RUST_LIB_SRC 585 export RUST_LIB_SRC 586endif 587 588# Allows the usage of unstable features in stable compilers. 589export RUSTC_BOOTSTRAP := 1 590 591export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 592export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 593export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 594export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 595export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 596export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 597export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 598export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 599 600export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 601export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 602export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 603export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 604export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 605export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 606 607# Files to ignore in find ... statements 608 609export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 610 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 611 -prune -o 612export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 613 --exclude CVS --exclude .pc --exclude .hg --exclude .git 614 615# =========================================================================== 616# Rules shared between *config targets and build targets 617 618# Basic helpers built in scripts/basic/ 619PHONY += scripts_basic 620scripts_basic: 621 $(Q)$(MAKE) $(build)=scripts/basic 622 623PHONY += outputmakefile 624ifdef building_out_of_srctree 625# Before starting out-of-tree build, make sure the source tree is clean. 626# outputmakefile generates a Makefile in the output directory, if using a 627# separate output directory. This allows convenient use of make in the 628# output directory. 629# At the same time when output Makefile generated, generate .gitignore to 630# ignore whole output directory 631 632quiet_cmd_makefile = GEN Makefile 633 cmd_makefile = { \ 634 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 635 echo "include $(srctree)/Makefile"; \ 636 } > Makefile 637 638outputmakefile: 639 @if [ -f $(srctree)/.config -o \ 640 -d $(srctree)/include/config -o \ 641 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 642 echo >&2 "***"; \ 643 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 644 echo >&2 "*** in $(abs_srctree)";\ 645 echo >&2 "***"; \ 646 false; \ 647 fi 648 $(Q)ln -fsn $(srctree) source 649 $(call cmd,makefile) 650 $(Q)test -e .gitignore || \ 651 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 652endif 653 654# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 655# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 656# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 657# and from include/config/auto.conf.cmd to detect the compiler upgrade. 658CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 659 660ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 661include $(srctree)/scripts/Makefile.clang 662endif 663 664# Include this also for config targets because some architectures need 665# cc-cross-prefix to determine CROSS_COMPILE. 666ifdef need-compiler 667include $(srctree)/scripts/Makefile.compiler 668endif 669 670ifdef config-build 671# =========================================================================== 672# *config targets only - make sure prerequisites are updated, and descend 673# in scripts/kconfig to make the *config target 674 675# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 676# KBUILD_DEFCONFIG may point out an alternative default configuration 677# used for 'make defconfig' 678include $(srctree)/arch/$(SRCARCH)/Makefile 679export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 680 681config: outputmakefile scripts_basic FORCE 682 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 683 684%config: outputmakefile scripts_basic FORCE 685 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 686 687else #!config-build 688# =========================================================================== 689# Build targets only - this includes vmlinux, arch-specific targets, clean 690# targets and others. In general all targets except *config targets. 691 692# If building an external module we do not care about the all: rule 693# but instead __all depend on modules 694PHONY += all 695ifeq ($(KBUILD_EXTMOD),) 696__all: all 697else 698__all: modules 699endif 700 701targets := 702 703# Decide whether to build built-in, modular, or both. 704# Normally, just do built-in. 705 706KBUILD_MODULES := 707KBUILD_BUILTIN := 1 708 709# If we have only "make modules", don't compile built-in objects. 710ifeq ($(MAKECMDGOALS),modules) 711 KBUILD_BUILTIN := 712endif 713 714# If we have "make <whatever> modules", compile modules 715# in addition to whatever we do anyway. 716# Just "make" or "make all" shall build modules as well 717 718ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 719 KBUILD_MODULES := 1 720endif 721 722ifeq ($(MAKECMDGOALS),) 723 KBUILD_MODULES := 1 724endif 725 726export KBUILD_MODULES KBUILD_BUILTIN 727 728ifdef need-config 729include include/config/auto.conf 730endif 731 732ifeq ($(KBUILD_EXTMOD),) 733# Objects we will link into vmlinux / subdirs we need to visit 734core-y := 735drivers-y := 736libs-y := lib/ 737endif # KBUILD_EXTMOD 738 739# The all: target is the default when no target is given on the 740# command line. 741# This allow a user to issue only 'make' to build a kernel including modules 742# Defaults to vmlinux, but the arch makefile usually adds further targets 743all: vmlinux 744 745CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 746ifdef CONFIG_CC_IS_GCC 747CFLAGS_GCOV += -fno-tree-loop-im 748endif 749export CFLAGS_GCOV 750 751# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 752ifdef CONFIG_FUNCTION_TRACER 753 CC_FLAGS_FTRACE := -pg 754endif 755 756include $(srctree)/arch/$(SRCARCH)/Makefile 757 758ifdef need-config 759ifdef may-sync-config 760# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 761# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 762# because some architectures define CROSS_COMPILE there. 763include include/config/auto.conf.cmd 764 765$(KCONFIG_CONFIG): 766 @echo >&2 '***' 767 @echo >&2 '*** Configuration file "$@" not found!' 768 @echo >&2 '***' 769 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 770 @echo >&2 '*** "make menuconfig" or "make xconfig").' 771 @echo >&2 '***' 772 @/bin/false 773 774# The actual configuration files used during the build are stored in 775# include/generated/ and include/config/. Update them if .config is newer than 776# include/config/auto.conf (which mirrors .config). 777# 778# This exploits the 'multi-target pattern rule' trick. 779# The syncconfig should be executed only once to make all the targets. 780# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 781# 782# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 783# so you cannot notice that Kconfig is waiting for the user input. 784%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 785 $(Q)$(kecho) " SYNC $@" 786 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 787else # !may-sync-config 788# External modules and some install targets need include/generated/autoconf.h 789# and include/config/auto.conf but do not care if they are up-to-date. 790# Use auto.conf to trigger the test 791PHONY += include/config/auto.conf 792 793include/config/auto.conf: 794 @test -e include/generated/autoconf.h -a -e $@ || ( \ 795 echo >&2; \ 796 echo >&2 " ERROR: Kernel configuration is invalid."; \ 797 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 798 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 799 echo >&2 ; \ 800 /bin/false) 801 802endif # may-sync-config 803endif # need-config 804 805KBUILD_CFLAGS += -fno-delete-null-pointer-checks 806 807ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 808KBUILD_CFLAGS += -O2 809KBUILD_RUSTFLAGS += -Copt-level=2 810else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 811KBUILD_CFLAGS += -Os 812KBUILD_RUSTFLAGS += -Copt-level=s 813endif 814 815# Always set `debug-assertions` and `overflow-checks` because their default 816# depends on `opt-level` and `debug-assertions`, respectively. 817KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 818KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 819 820# Tell gcc to never replace conditional load with a non-conditional one 821ifdef CONFIG_CC_IS_GCC 822# gcc-10 renamed --param=allow-store-data-races=0 to 823# -fno-allow-store-data-races. 824KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 825KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 826endif 827 828ifdef CONFIG_READABLE_ASM 829# Disable optimizations that make assembler listings hard to read. 830# reorder blocks reorders the control in the function 831# ipa clone creates specialized cloned functions 832# partial inlining inlines only parts of functions 833KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 834endif 835 836stackp-flags-y := -fno-stack-protector 837stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 838stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 839 840KBUILD_CFLAGS += $(stackp-flags-y) 841 842KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 843KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 844 845ifdef CONFIG_FRAME_POINTER 846KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 847KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 848else 849# Some targets (ARM with Thumb2, for example), can't be built with frame 850# pointers. For those, we don't have FUNCTION_TRACER automatically 851# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 852# incompatible with -fomit-frame-pointer with current GCC, so we don't use 853# -fomit-frame-pointer with FUNCTION_TRACER. 854# In the Rust target specification, "frame-pointer" is set explicitly 855# to "may-omit". 856ifndef CONFIG_FUNCTION_TRACER 857KBUILD_CFLAGS += -fomit-frame-pointer 858endif 859endif 860 861# Initialize all stack variables with a 0xAA pattern. 862ifdef CONFIG_INIT_STACK_ALL_PATTERN 863KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 864endif 865 866# Initialize all stack variables with a zero value. 867ifdef CONFIG_INIT_STACK_ALL_ZERO 868KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 869ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 870# https://github.com/llvm/llvm-project/issues/44842 871CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 872export CC_AUTO_VAR_INIT_ZERO_ENABLER 873KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 874endif 875endif 876 877# While VLAs have been removed, GCC produces unreachable stack probes 878# for the randomize_kstack_offset feature. Disable it for all compilers. 879KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 880 881# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 882ifdef CONFIG_ZERO_CALL_USED_REGS 883KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 884endif 885 886ifdef CONFIG_FUNCTION_TRACER 887ifdef CONFIG_FTRACE_MCOUNT_USE_CC 888 CC_FLAGS_FTRACE += -mrecord-mcount 889 ifdef CONFIG_HAVE_NOP_MCOUNT 890 ifeq ($(call cc-option-yn, -mnop-mcount),y) 891 CC_FLAGS_FTRACE += -mnop-mcount 892 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 893 endif 894 endif 895endif 896ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 897 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 898 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 899 endif 900endif 901ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 902 ifdef CONFIG_HAVE_C_RECORDMCOUNT 903 BUILD_C_RECORDMCOUNT := y 904 export BUILD_C_RECORDMCOUNT 905 endif 906endif 907ifdef CONFIG_HAVE_FENTRY 908 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 909 ifeq ($(call cc-option-yn, -mfentry),y) 910 CC_FLAGS_FTRACE += -mfentry 911 CC_FLAGS_USING += -DCC_USING_FENTRY 912 endif 913endif 914export CC_FLAGS_FTRACE 915KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 916KBUILD_AFLAGS += $(CC_FLAGS_USING) 917endif 918 919# We trigger additional mismatches with less inlining 920ifdef CONFIG_DEBUG_SECTION_MISMATCH 921KBUILD_CFLAGS += -fno-inline-functions-called-once 922endif 923 924# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 925ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 926KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 927KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 928LDFLAGS_vmlinux += --gc-sections 929endif 930 931ifdef CONFIG_SHADOW_CALL_STACK 932ifndef CONFIG_DYNAMIC_SCS 933CC_FLAGS_SCS := -fsanitize=shadow-call-stack 934KBUILD_CFLAGS += $(CC_FLAGS_SCS) 935endif 936export CC_FLAGS_SCS 937endif 938 939ifdef CONFIG_LTO_CLANG 940ifdef CONFIG_LTO_CLANG_THIN 941CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 942KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 943else 944CC_FLAGS_LTO := -flto 945endif 946CC_FLAGS_LTO += -fvisibility=hidden 947 948# Limit inlining across translation units to reduce binary size 949KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 950 951# Check for frame size exceeding threshold during prolog/epilog insertion 952# when using lld < 13.0.0. 953ifneq ($(CONFIG_FRAME_WARN),0) 954ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 955KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 956endif 957endif 958endif 959 960ifdef CONFIG_LTO 961KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 962KBUILD_AFLAGS += -fno-lto 963export CC_FLAGS_LTO 964endif 965 966ifdef CONFIG_CFI_CLANG 967CC_FLAGS_CFI := -fsanitize=kcfi 968KBUILD_CFLAGS += $(CC_FLAGS_CFI) 969export CC_FLAGS_CFI 970endif 971 972ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 973KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 974endif 975 976# arch Makefile may override CC so keep this after arch Makefile is included 977NOSTDINC_FLAGS += -nostdinc 978 979# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 980# the kernel uses only C99 flexible arrays for dynamically sized trailing 981# arrays. Enforce this for everything that may examine structure sizes and 982# perform bounds checking. 983KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 984 985# disable invalid "can't wrap" optimizations for signed / pointers 986KBUILD_CFLAGS += -fno-strict-overflow 987 988# Make sure -fstack-check isn't enabled (like gentoo apparently did) 989KBUILD_CFLAGS += -fno-stack-check 990 991# conserve stack if available 992ifdef CONFIG_CC_IS_GCC 993KBUILD_CFLAGS += -fconserve-stack 994endif 995 996# change __FILE__ to the relative path from the srctree 997KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 998 999# include additional Makefiles when needed 1000include-y := scripts/Makefile.extrawarn 1001include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1002include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1003include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1004include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1005include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1006include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1007include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1008include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1009include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1010 1011include $(addprefix $(srctree)/, $(include-y)) 1012 1013# scripts/Makefile.gcc-plugins is intentionally included last. 1014# Do not add $(call cc-option,...) below this line. When you build the kernel 1015# from the clean source tree, the GCC plugins do not exist at this point. 1016 1017# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1018KBUILD_CPPFLAGS += $(KCPPFLAGS) 1019KBUILD_AFLAGS += $(KAFLAGS) 1020KBUILD_CFLAGS += $(KCFLAGS) 1021KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1022 1023KBUILD_LDFLAGS_MODULE += --build-id=sha1 1024LDFLAGS_vmlinux += --build-id=sha1 1025 1026KBUILD_LDFLAGS += -z noexecstack 1027ifeq ($(CONFIG_LD_IS_BFD),y) 1028KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1029endif 1030 1031ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1032LDFLAGS_vmlinux += -X 1033endif 1034 1035ifeq ($(CONFIG_RELR),y) 1036# ld.lld before 15 did not support -z pack-relative-relocs. 1037LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1038endif 1039 1040# We never want expected sections to be placed heuristically by the 1041# linker. All sections should be explicitly named in the linker script. 1042ifdef CONFIG_LD_ORPHAN_WARN 1043LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1044endif 1045 1046# Align the bit size of userspace programs with the kernel 1047KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1048KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1049 1050# make the checker run with the right architecture 1051CHECKFLAGS += --arch=$(ARCH) 1052 1053# insure the checker run with the right endianness 1054CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1055 1056# the checker needs the correct machine size 1057CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1058 1059# Default kernel image to build when no specific target is given. 1060# KBUILD_IMAGE may be overruled on the command line or 1061# set in the environment 1062# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1063# this default value 1064export KBUILD_IMAGE ?= vmlinux 1065 1066# 1067# INSTALL_PATH specifies where to place the updated kernel and system map 1068# images. Default is /boot, but you can set it to other values 1069export INSTALL_PATH ?= /boot 1070 1071# 1072# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1073# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1074# an argument if needed. Otherwise it defaults to the kernel install path 1075# 1076export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1077 1078# 1079# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1080# relocations required by build roots. This is not defined in the 1081# makefile but the argument can be passed to make if needed. 1082# 1083 1084MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1085export MODLIB 1086 1087PHONY += prepare0 1088 1089export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1090export MODORDER := $(extmod_prefix)modules.order 1091export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1092 1093ifeq ($(KBUILD_EXTMOD),) 1094 1095build-dir := . 1096clean-dirs := $(sort . Documentation \ 1097 $(patsubst %/,%,$(filter %/, $(core-) \ 1098 $(drivers-) $(libs-)))) 1099 1100export ARCH_CORE := $(core-y) 1101export ARCH_LIB := $(filter %/, $(libs-y)) 1102export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1103# Externally visible symbols (used by link-vmlinux.sh) 1104 1105KBUILD_VMLINUX_OBJS := ./built-in.a 1106ifdef CONFIG_MODULES 1107KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1108KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1109else 1110KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1111endif 1112 1113export KBUILD_VMLINUX_LIBS 1114export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1115 1116ifdef CONFIG_TRIM_UNUSED_KSYMS 1117# For the kernel to actually contain only the needed exported symbols, 1118# we have to build modules as well to determine what those symbols are. 1119KBUILD_MODULES := 1 1120endif 1121 1122# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1123quiet_cmd_ar_vmlinux.a = AR $@ 1124 cmd_ar_vmlinux.a = \ 1125 rm -f $@; \ 1126 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1127 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1128 1129targets += vmlinux.a 1130vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1131 $(call if_changed,ar_vmlinux.a) 1132 1133PHONY += vmlinux_o 1134vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1136 1137vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1138 @: 1139 1140PHONY += vmlinux 1141# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1142# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1143# unrelated; the decompressors just happen to have the same base name, 1144# arch/*/boot/compressed/vmlinux. 1145# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1146# 1147# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1148# https://savannah.gnu.org/bugs/?61463 1149# For Make > 4.4, the following simple code will work: 1150# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1151vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1152vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1153vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1154 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1155 1156# The actual objects are generated when descending, 1157# make sure no implicit rule kicks in 1158$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1159 1160ifeq ($(origin KERNELRELEASE),file) 1161filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1162else 1163filechk_kernel.release = echo $(KERNELRELEASE) 1164endif 1165 1166# Store (new) KERNELRELEASE string in include/config/kernel.release 1167include/config/kernel.release: FORCE 1168 $(call filechk,kernel.release) 1169 1170# Additional helpers built in scripts/ 1171# Carefully list dependencies so we do not try to build scripts twice 1172# in parallel 1173PHONY += scripts 1174scripts: scripts_basic scripts_dtc 1175 $(Q)$(MAKE) $(build)=$(@) 1176 1177# Things we need to do before we recursively start building the kernel 1178# or the modules are listed in "prepare". 1179# A multi level approach is used. prepareN is processed before prepareN-1. 1180# archprepare is used in arch Makefiles and when processed asm symlink, 1181# version.h and scripts_basic is processed / created. 1182 1183PHONY += prepare archprepare 1184 1185archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1186 asm-generic $(version_h) include/generated/utsrelease.h \ 1187 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1188 1189prepare0: archprepare 1190 $(Q)$(MAKE) $(build)=scripts/mod 1191 $(Q)$(MAKE) $(build)=. prepare 1192 1193# All the preparing.. 1194prepare: prepare0 1195ifdef CONFIG_RUST 1196 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1197 $(Q)$(MAKE) $(build)=rust 1198endif 1199 1200PHONY += remove-stale-files 1201remove-stale-files: 1202 $(Q)$(srctree)/scripts/remove-stale-files 1203 1204# Support for using generic headers in asm-generic 1205asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1206 1207PHONY += asm-generic uapi-asm-generic 1208asm-generic: uapi-asm-generic 1209 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1210 generic=include/asm-generic 1211uapi-asm-generic: 1212 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1213 generic=include/uapi/asm-generic 1214 1215# Generate some files 1216# --------------------------------------------------------------------------- 1217 1218# KERNELRELEASE can change from a few different places, meaning version.h 1219# needs to be updated, so this check is forced on all builds 1220 1221uts_len := 64 1222define filechk_utsrelease.h 1223 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1224 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1225 exit 1; \ 1226 fi; \ 1227 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1228endef 1229 1230define filechk_version.h 1231 if [ $(SUBLEVEL) -gt 255 ]; then \ 1232 echo \#define LINUX_VERSION_CODE $(shell \ 1233 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1234 else \ 1235 echo \#define LINUX_VERSION_CODE $(shell \ 1236 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1237 fi; \ 1238 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1239 ((c) > 255 ? 255 : (c)))'; \ 1240 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1241 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1242 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1243endef 1244 1245$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1246$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1247$(version_h): FORCE 1248 $(call filechk,version.h) 1249 1250include/generated/utsrelease.h: include/config/kernel.release FORCE 1251 $(call filechk,utsrelease.h) 1252 1253filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1254 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1255 1256include/generated/compile.h: FORCE 1257 $(call filechk,compile.h) 1258 1259PHONY += headerdep 1260headerdep: 1261 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1262 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1263 1264# --------------------------------------------------------------------------- 1265# Kernel headers 1266 1267#Default location for installed headers 1268export INSTALL_HDR_PATH = $(objtree)/usr 1269 1270quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1271 cmd_headers_install = \ 1272 mkdir -p $(INSTALL_HDR_PATH); \ 1273 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1274 usr/include $(INSTALL_HDR_PATH) 1275 1276PHONY += headers_install 1277headers_install: headers 1278 $(call cmd,headers_install) 1279 1280PHONY += archheaders archscripts 1281 1282hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1283 1284PHONY += headers 1285headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1286 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1287 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1288 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1289 1290ifdef CONFIG_HEADERS_INSTALL 1291prepare: headers 1292endif 1293 1294PHONY += scripts_unifdef 1295scripts_unifdef: scripts_basic 1296 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1297 1298# --------------------------------------------------------------------------- 1299# Install 1300 1301# Many distributions have the custom install script, /sbin/installkernel. 1302# If DKMS is installed, 'make install' will eventually recurse back 1303# to this Makefile to build and install external modules. 1304# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1305 1306quiet_cmd_install = INSTALL $(INSTALL_PATH) 1307 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1308 1309# --------------------------------------------------------------------------- 1310# vDSO install 1311 1312PHONY += vdso_install 1313vdso_install: export INSTALL_FILES = $(vdso-install-y) 1314vdso_install: 1315 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1316 1317# --------------------------------------------------------------------------- 1318# Tools 1319 1320ifdef CONFIG_OBJTOOL 1321prepare: tools/objtool 1322endif 1323 1324ifdef CONFIG_BPF 1325ifdef CONFIG_DEBUG_INFO_BTF 1326prepare: tools/bpf/resolve_btfids 1327endif 1328endif 1329 1330PHONY += resolve_btfids_clean 1331 1332resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1333 1334# tools/bpf/resolve_btfids directory might not exist 1335# in output directory, skip its clean in that case 1336resolve_btfids_clean: 1337ifneq ($(wildcard $(resolve_btfids_O)),) 1338 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1339endif 1340 1341# Clear a bunch of variables before executing the submake 1342ifeq ($(quiet),silent_) 1343tools_silent=s 1344endif 1345 1346tools/: FORCE 1347 $(Q)mkdir -p $(objtree)/tools 1348 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1349 1350tools/%: FORCE 1351 $(Q)mkdir -p $(objtree)/tools 1352 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1353 1354# --------------------------------------------------------------------------- 1355# Kernel selftest 1356 1357PHONY += kselftest 1358kselftest: headers 1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1360 1361kselftest-%: headers FORCE 1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1363 1364PHONY += kselftest-merge 1365kselftest-merge: 1366 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1367 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1368 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1369 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1370 1371# --------------------------------------------------------------------------- 1372# Devicetree files 1373 1374ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1375dtstree := arch/$(SRCARCH)/boot/dts 1376endif 1377 1378ifneq ($(dtstree),) 1379 1380%.dtb: dtbs_prepare 1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1382 1383%.dtbo: dtbs_prepare 1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1385 1386PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1387dtbs: dtbs_prepare 1388 $(Q)$(MAKE) $(build)=$(dtstree) 1389 1390# include/config/kernel.release is actually needed when installing DTBs because 1391# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1392# dtbs_install depend on it as dtbs_install may run as root. 1393dtbs_prepare: include/config/kernel.release scripts_dtc 1394 1395ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1396export CHECK_DTBS=y 1397endif 1398 1399ifneq ($(CHECK_DTBS),) 1400dtbs_prepare: dt_binding_check 1401endif 1402 1403dtbs_check: dtbs 1404 1405dtbs_install: 1406 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1407 1408ifdef CONFIG_OF_EARLY_FLATTREE 1409all: dtbs 1410endif 1411 1412endif 1413 1414PHONY += scripts_dtc 1415scripts_dtc: scripts_basic 1416 $(Q)$(MAKE) $(build)=scripts/dtc 1417 1418ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1419export CHECK_DT_BINDING=y 1420endif 1421 1422PHONY += dt_binding_check 1423dt_binding_check: scripts_dtc 1424 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1425 1426PHONY += dt_compatible_check 1427dt_compatible_check: dt_binding_check 1428 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1429 1430# --------------------------------------------------------------------------- 1431# Modules 1432 1433ifdef CONFIG_MODULES 1434 1435# By default, build modules as well 1436 1437all: modules 1438 1439# When we're building modules with modversions, we need to consider 1440# the built-in objects during the descend as well, in order to 1441# make sure the checksums are up to date before we record them. 1442ifdef CONFIG_MODVERSIONS 1443 KBUILD_BUILTIN := 1 1444endif 1445 1446# Build modules 1447# 1448 1449# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1450# is an exception. 1451ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1452KBUILD_BUILTIN := 1 1453modules: vmlinux 1454endif 1455 1456modules: modules_prepare 1457 1458# Target to prepare building external modules 1459modules_prepare: prepare 1460 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1461 1462endif # CONFIG_MODULES 1463 1464### 1465# Cleaning is done on three levels. 1466# make clean Delete most generated files 1467# Leave enough to build external modules 1468# make mrproper Delete the current configuration, and all generated files 1469# make distclean Remove editor backup files, patch leftover files and the like 1470 1471# Directories & files removed with 'make clean' 1472CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1473 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1474 compile_commands.json .thinlto-cache rust/test \ 1475 rust-project.json .vmlinux.objs .vmlinux.export.c 1476 1477# Directories & files removed with 'make mrproper' 1478MRPROPER_FILES += include/config include/generated \ 1479 arch/$(SRCARCH)/include/generated .objdiff \ 1480 debian snap tar-install \ 1481 .config .config.old .version \ 1482 Module.symvers \ 1483 certs/signing_key.pem \ 1484 certs/x509.genkey \ 1485 vmlinux-gdb.py \ 1486 rpmbuild \ 1487 rust/libmacros.so 1488 1489# clean - Delete most, but leave enough to build external modules 1490# 1491clean: rm-files := $(CLEAN_FILES) 1492 1493PHONY += archclean vmlinuxclean 1494 1495vmlinuxclean: 1496 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1497 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1498 1499clean: archclean vmlinuxclean resolve_btfids_clean 1500 1501# mrproper - Delete all generated files, including .config 1502# 1503mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1504mrproper-dirs := $(addprefix _mrproper_,scripts) 1505 1506PHONY += $(mrproper-dirs) mrproper 1507$(mrproper-dirs): 1508 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1509 1510mrproper: clean $(mrproper-dirs) 1511 $(call cmd,rmfiles) 1512 @find . $(RCS_FIND_IGNORE) \ 1513 \( -name '*.rmeta' \) \ 1514 -type f -print | xargs rm -f 1515 1516# distclean 1517# 1518PHONY += distclean 1519 1520distclean: mrproper 1521 @find . $(RCS_FIND_IGNORE) \ 1522 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1523 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1524 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1525 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1526 -type f -print | xargs rm -f 1527 1528 1529# Packaging of the kernel to various formats 1530# --------------------------------------------------------------------------- 1531 1532%src-pkg: FORCE 1533 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1534%pkg: include/config/kernel.release FORCE 1535 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1536 1537# Brief documentation of the typical targets used 1538# --------------------------------------------------------------------------- 1539 1540boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1541boards := $(sort $(notdir $(boards))) 1542board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1543board-dirs := $(sort $(notdir $(board-dirs:/=))) 1544 1545PHONY += help 1546help: 1547 @echo 'Cleaning targets:' 1548 @echo ' clean - Remove most generated files but keep the config and' 1549 @echo ' enough build support to build external modules' 1550 @echo ' mrproper - Remove all generated files + config + various backup files' 1551 @echo ' distclean - mrproper + remove editor backup and patch files' 1552 @echo '' 1553 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1554 @echo '' 1555 @echo 'Other generic targets:' 1556 @echo ' all - Build all targets marked with [*]' 1557 @echo '* vmlinux - Build the bare kernel' 1558 @echo '* modules - Build all modules' 1559 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1560 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1561 @echo ' dir/ - Build all files in dir and below' 1562 @echo ' dir/file.[ois] - Build specified target only' 1563 @echo ' dir/file.ll - Build the LLVM assembly file' 1564 @echo ' (requires compiler support for LLVM assembly generation)' 1565 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1566 @echo ' (requires a recent binutils and recent build (System.map))' 1567 @echo ' dir/file.ko - Build module including final link' 1568 @echo ' modules_prepare - Set up for building external modules' 1569 @echo ' tags/TAGS - Generate tags file for editors' 1570 @echo ' cscope - Generate cscope index' 1571 @echo ' gtags - Generate GNU GLOBAL index' 1572 @echo ' kernelrelease - Output the release version string (use with make -s)' 1573 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1574 @echo ' image_name - Output the image name (use with make -s)' 1575 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1576 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1577 echo '' 1578 @echo 'Static analysers:' 1579 @echo ' checkstack - Generate a list of stack hogs' 1580 @echo ' versioncheck - Sanity check on version.h usage' 1581 @echo ' includecheck - Check for duplicate included header files' 1582 @echo ' export_report - List the usages of all exported symbols' 1583 @echo ' headerdep - Detect inclusion cycles in headers' 1584 @echo ' coccicheck - Check with Coccinelle' 1585 @echo ' clang-analyzer - Check with clang static analyzer' 1586 @echo ' clang-tidy - Check with clang-tidy' 1587 @echo '' 1588 @echo 'Tools:' 1589 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1590 @echo '' 1591 @echo 'Kernel selftest:' 1592 @echo ' kselftest - Build and run kernel selftest' 1593 @echo ' Build, install, and boot kernel before' 1594 @echo ' running kselftest on it' 1595 @echo ' Run as root for full coverage' 1596 @echo ' kselftest-all - Build kernel selftest' 1597 @echo ' kselftest-install - Build and install kernel selftest' 1598 @echo ' kselftest-clean - Remove all generated kselftest files' 1599 @echo ' kselftest-merge - Merge all the config dependencies of' 1600 @echo ' kselftest to existing .config.' 1601 @echo '' 1602 @echo 'Rust targets:' 1603 @echo ' rustavailable - Checks whether the Rust toolchain is' 1604 @echo ' available and, if not, explains why.' 1605 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1606 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1607 @echo ' is formatted, printing a diff otherwise.' 1608 @echo ' rustdoc - Generate Rust documentation' 1609 @echo ' (requires kernel .config)' 1610 @echo ' rusttest - Runs the Rust tests' 1611 @echo ' (requires kernel .config; downloads external repos)' 1612 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1613 @echo ' (requires kernel .config)' 1614 @echo ' dir/file.[os] - Build specified target only' 1615 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1616 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1617 @echo ' The output is not intended to be compilable.' 1618 @echo ' dir/file.ll - Build the LLVM assembly file' 1619 @echo '' 1620 @$(if $(dtstree), \ 1621 echo 'Devicetree:'; \ 1622 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1623 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1624 echo ' dt_binding_check - Validate device tree binding documents'; \ 1625 echo ' dtbs_check - Validate device tree source files';\ 1626 echo '') 1627 1628 @echo 'Userspace tools targets:' 1629 @echo ' use "make tools/help"' 1630 @echo ' or "cd tools; make help"' 1631 @echo '' 1632 @echo 'Kernel packaging:' 1633 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1634 @echo '' 1635 @echo 'Documentation targets:' 1636 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1637 @echo '' 1638 @echo 'Architecture-specific targets ($(SRCARCH)):' 1639 @$(or $(archhelp),\ 1640 echo ' No architecture-specific help defined for $(SRCARCH)') 1641 @echo '' 1642 @$(if $(boards), \ 1643 $(foreach b, $(boards), \ 1644 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1645 echo '') 1646 @$(if $(board-dirs), \ 1647 $(foreach b, $(board-dirs), \ 1648 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1649 printf " %-16s - Show all of the above\\n" help-boards; \ 1650 echo '') 1651 1652 @echo ' make V=n [targets] 1: verbose build' 1653 @echo ' 2: give reason for rebuild of target' 1654 @echo ' V=1 and V=2 can be combined with V=12' 1655 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1656 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1657 @echo ' (sparse by default)' 1658 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1659 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1660 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1661 @echo ' 1: warnings which may be relevant and do not occur too often' 1662 @echo ' 2: warnings which occur quite often but may still be relevant' 1663 @echo ' 3: more obscure warnings, can most likely be ignored' 1664 @echo ' e: warnings are being treated as errors' 1665 @echo ' Multiple levels can be combined with W=12 or W=123' 1666 @$(if $(dtstree), \ 1667 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1668 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1669 ) 1670 @echo '' 1671 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1672 @echo 'For further info see the ./README file' 1673 1674 1675help-board-dirs := $(addprefix help-,$(board-dirs)) 1676 1677help-boards: $(help-board-dirs) 1678 1679boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1680 1681$(help-board-dirs): help-%: 1682 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1683 @$(if $(boards-per-dir), \ 1684 $(foreach b, $(boards-per-dir), \ 1685 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1686 echo '') 1687 1688 1689# Documentation targets 1690# --------------------------------------------------------------------------- 1691DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1692 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1693PHONY += $(DOC_TARGETS) 1694$(DOC_TARGETS): 1695 $(Q)$(MAKE) $(build)=Documentation $@ 1696 1697 1698# Rust targets 1699# --------------------------------------------------------------------------- 1700 1701# "Is Rust available?" target 1702PHONY += rustavailable 1703rustavailable: 1704 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1705 1706# Documentation target 1707# 1708# Using the singular to avoid running afoul of `no-dot-config-targets`. 1709PHONY += rustdoc 1710rustdoc: prepare 1711 $(Q)$(MAKE) $(build)=rust $@ 1712 1713# Testing target 1714PHONY += rusttest 1715rusttest: prepare 1716 $(Q)$(MAKE) $(build)=rust $@ 1717 1718# Formatting targets 1719PHONY += rustfmt rustfmtcheck 1720 1721# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1722# 1723# We match using absolute paths since `find` does not resolve them 1724# when matching, which is a problem when e.g. `srctree` is `..`. 1725# We `grep` afterwards in order to remove the directory entry itself. 1726rustfmt: 1727 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1728 -o -path $(abs_srctree)/rust/alloc -prune \ 1729 -o -path $(abs_objtree)/rust/test -prune \ 1730 | grep -Fv $(abs_srctree)/rust/alloc \ 1731 | grep -Fv $(abs_objtree)/rust/test \ 1732 | grep -Fv generated \ 1733 | xargs $(RUSTFMT) $(rustfmt_flags) 1734 1735rustfmtcheck: rustfmt_flags = --check 1736rustfmtcheck: rustfmt 1737 1738# Misc 1739# --------------------------------------------------------------------------- 1740 1741PHONY += misc-check 1742misc-check: 1743 $(Q)$(srctree)/scripts/misc-check 1744 1745all: misc-check 1746 1747PHONY += scripts_gdb 1748scripts_gdb: prepare0 1749 $(Q)$(MAKE) $(build)=scripts/gdb 1750 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1751 1752ifdef CONFIG_GDB_SCRIPTS 1753all: scripts_gdb 1754endif 1755 1756else # KBUILD_EXTMOD 1757 1758filechk_kernel.release = echo $(KERNELRELEASE) 1759 1760### 1761# External module support. 1762# When building external modules the kernel used as basis is considered 1763# read-only, and no consistency checks are made and the make 1764# system is not used on the basis kernel. If updates are required 1765# in the basis kernel ordinary make commands (without M=...) must be used. 1766 1767# We are always building only modules. 1768KBUILD_BUILTIN := 1769KBUILD_MODULES := 1 1770 1771build-dir := $(KBUILD_EXTMOD) 1772 1773compile_commands.json: $(extmod_prefix)compile_commands.json 1774PHONY += compile_commands.json 1775 1776clean-dirs := $(KBUILD_EXTMOD) 1777clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1778 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1779 1780PHONY += prepare 1781# now expand this into a simple variable to reduce the cost of shell evaluations 1782prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1783prepare: 1784 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1785 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1786 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1787 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1788 fi 1789 1790PHONY += help 1791help: 1792 @echo ' Building external modules.' 1793 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1794 @echo '' 1795 @echo ' modules - default target, build the module(s)' 1796 @echo ' modules_install - install the module' 1797 @echo ' clean - remove generated files in module directory only' 1798 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1799 @echo '' 1800 1801ifndef CONFIG_MODULES 1802modules modules_install: __external_modules_error 1803__external_modules_error: 1804 @echo >&2 '***' 1805 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1806 @echo >&2 '*** You cannot build or install external modules.' 1807 @echo >&2 '***' 1808 @false 1809endif 1810 1811endif # KBUILD_EXTMOD 1812 1813# --------------------------------------------------------------------------- 1814# Modules 1815 1816PHONY += modules modules_install modules_sign modules_prepare 1817 1818modules_install: 1819 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1820 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1821 1822ifeq ($(CONFIG_MODULE_SIG),y) 1823# modules_sign is a subset of modules_install. 1824# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1825modules_sign: modules_install 1826 @: 1827else 1828modules_sign: 1829 @echo >&2 '***' 1830 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1831 @echo >&2 '***' 1832 @false 1833endif 1834 1835ifdef CONFIG_MODULES 1836 1837$(MODORDER): $(build-dir) 1838 @: 1839 1840# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1841# This is solely useful to speed up test compiles. 1842modules: modpost 1843ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1844 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1845endif 1846 1847PHONY += modules_check 1848modules_check: $(MODORDER) 1849 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1850 1851else # CONFIG_MODULES 1852 1853modules: 1854 @: 1855 1856KBUILD_MODULES := 1857 1858endif # CONFIG_MODULES 1859 1860PHONY += modpost 1861modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1862 $(if $(KBUILD_MODULES), modules_check) 1863 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1864 1865# Single targets 1866# --------------------------------------------------------------------------- 1867# To build individual files in subdirectories, you can do like this: 1868# 1869# make foo/bar/baz.s 1870# 1871# The supported suffixes for single-target are listed in 'single-targets' 1872# 1873# To build only under specific subdirectories, you can do like this: 1874# 1875# make foo/bar/baz/ 1876 1877ifdef single-build 1878 1879# .ko is special because modpost is needed 1880single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1881single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1882 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1883 1884$(single-ko): single_modules 1885 @: 1886$(single-no-ko): $(build-dir) 1887 @: 1888 1889# Remove MODORDER when done because it is not the real one. 1890PHONY += single_modules 1891single_modules: $(single-no-ko) modules_prepare 1892 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1893 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1894ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1895 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1896endif 1897 $(Q)rm -f $(MODORDER) 1898 1899single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1900 1901KBUILD_MODULES := 1 1902 1903endif 1904 1905# Preset locale variables to speed up the build process. Limit locale 1906# tweaks to this spot to avoid wrong language settings when running 1907# make menuconfig etc. 1908# Error messages still appears in the original language 1909PHONY += $(build-dir) 1910$(build-dir): prepare 1911 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1912 1913clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1914PHONY += $(clean-dirs) clean 1915$(clean-dirs): 1916 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1917 1918clean: $(clean-dirs) 1919 $(call cmd,rmfiles) 1920 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1921 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1922 -o -name '*.ko.*' \ 1923 -o -name '*.dtb' -o -name '*.dtbo' \ 1924 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1925 -o -name '*.dt.yaml' \ 1926 -o -name '*.dwo' -o -name '*.lst' \ 1927 -o -name '*.su' -o -name '*.mod' \ 1928 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1929 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1930 -o -name '*.asn1.[ch]' \ 1931 -o -name '*.symtypes' -o -name 'modules.order' \ 1932 -o -name '*.c.[012]*.*' \ 1933 -o -name '*.ll' \ 1934 -o -name '*.gcno' \ 1935 -o -name '*.*.symversions' \) -type f -print \ 1936 -o -name '.tmp_*' -print \ 1937 | xargs rm -rf 1938 1939# Generate tags for editors 1940# --------------------------------------------------------------------------- 1941quiet_cmd_tags = GEN $@ 1942 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1943 1944tags TAGS cscope gtags: FORCE 1945 $(call cmd,tags) 1946 1947# IDE support targets 1948PHONY += rust-analyzer 1949rust-analyzer: 1950 $(Q)$(MAKE) $(build)=rust $@ 1951 1952# Script to generate missing namespace dependencies 1953# --------------------------------------------------------------------------- 1954 1955PHONY += nsdeps 1956nsdeps: export KBUILD_NSDEPS=1 1957nsdeps: modules 1958 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1959 1960# Clang Tooling 1961# --------------------------------------------------------------------------- 1962 1963quiet_cmd_gen_compile_commands = GEN $@ 1964 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1965 1966$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1967 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1968 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1969 $(call if_changed,gen_compile_commands) 1970 1971targets += $(extmod_prefix)compile_commands.json 1972 1973PHONY += clang-tidy clang-analyzer 1974 1975ifdef CONFIG_CC_IS_CLANG 1976quiet_cmd_clang_tools = CHECK $< 1977 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1978 1979clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1980 $(call cmd,clang_tools) 1981else 1982clang-tidy clang-analyzer: 1983 @echo "$@ requires CC=clang" >&2 1984 @false 1985endif 1986 1987# Scripts to check various things for consistency 1988# --------------------------------------------------------------------------- 1989 1990PHONY += includecheck versioncheck coccicheck export_report 1991 1992includecheck: 1993 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1994 -name '*.[hcS]' -type f -print | sort \ 1995 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1996 1997versioncheck: 1998 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1999 -name '*.[hcS]' -type f -print | sort \ 2000 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2001 2002coccicheck: 2003 $(Q)$(BASH) $(srctree)/scripts/$@ 2004 2005export_report: 2006 $(PERL) $(srctree)/scripts/export_report.pl 2007 2008PHONY += checkstack kernelrelease kernelversion image_name 2009 2010# UML needs a little special treatment here. It wants to use the host 2011# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2012# else wants $(ARCH), including people doing cross-builds, which means 2013# that $(SUBARCH) doesn't work here. 2014ifeq ($(ARCH), um) 2015CHECKSTACK_ARCH := $(SUBARCH) 2016else 2017CHECKSTACK_ARCH := $(ARCH) 2018endif 2019checkstack: 2020 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2021 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2022 2023kernelrelease: 2024 @$(filechk_kernel.release) 2025 2026kernelversion: 2027 @echo $(KERNELVERSION) 2028 2029image_name: 2030 @echo $(KBUILD_IMAGE) 2031 2032PHONY += run-command 2033run-command: 2034 $(Q)$(KBUILD_RUN_COMMAND) 2035 2036quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2037 cmd_rmfiles = rm -rf $(rm-files) 2038 2039# read saved command lines for existing targets 2040existing-targets := $(wildcard $(sort $(targets))) 2041 2042-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2043 2044endif # config-build 2045endif # mixed-build 2046endif # need-sub-make 2047 2048PHONY += FORCE 2049FORCE: 2050 2051# Declare the contents of the PHONY variable as phony. We keep that 2052# information in a variable so we can use it in if_changed and friends. 2053.PHONY: $(PHONY) 2054