1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 10 4SUBLEVEL = 0 5EXTRAVERSION = -rc7 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 ($(filter undefine,$(.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)) 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, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 97 98ifeq ($(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# backward compatibility 159KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 160 161ifeq ("$(origin W)", "command line") 162 KBUILD_EXTRA_WARN := $(W) 163endif 164 165export KBUILD_EXTRA_WARN 166 167# Kbuild will save output files in the current working directory. 168# This does not need to match to the root of the kernel source tree. 169# 170# For example, you can do this: 171# 172# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 173# 174# If you want to save output files in a different location, there are 175# two syntaxes to specify it. 176# 177# 1) O= 178# Use "make O=dir/to/store/output/files/" 179# 180# 2) Set KBUILD_OUTPUT 181# Set the environment variable KBUILD_OUTPUT to point to the output directory. 182# export KBUILD_OUTPUT=dir/to/store/output/files/; make 183# 184# The O= assignment takes precedence over the KBUILD_OUTPUT environment 185# variable. 186 187# Do we want to change the working directory? 188ifeq ("$(origin O)", "command line") 189 KBUILD_OUTPUT := $(O) 190endif 191 192ifneq ($(KBUILD_OUTPUT),) 193# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 194$(shell mkdir -p "$(KBUILD_OUTPUT)") 195# $(realpath ...) resolves symlinks 196abs_objtree := $(realpath $(KBUILD_OUTPUT)) 197$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 198endif # ifneq ($(KBUILD_OUTPUT),) 199 200ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 201$(error source directory cannot contain spaces or colons) 202endif 203 204ifneq ($(filter 3.%,$(MAKE_VERSION)),) 205# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 206# We need to invoke sub-make to avoid implicit rules in the top Makefile. 207need-sub-make := 1 208# Cancel implicit rules for this Makefile. 209$(this-makefile): ; 210endif 211 212export sub_make_done := 1 213 214endif # sub_make_done 215 216ifeq ($(abs_objtree),$(CURDIR)) 217# Suppress "Entering directory ..." if we are at the final work directory. 218no-print-directory := --no-print-directory 219else 220# Recursion to show "Entering directory ..." 221need-sub-make := 1 222endif 223 224ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 225# If --no-print-directory is unset, recurse once again to set it. 226# You may end up recursing into __sub-make twice. This is needed due to the 227# behavior change in GNU Make 4.4.1. 228need-sub-make := 1 229endif 230 231ifeq ($(need-sub-make),1) 232 233PHONY += $(MAKECMDGOALS) __sub-make 234 235$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 236 @: 237 238# Invoke a second make in the output directory, passing relevant variables 239__sub-make: 240 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 241 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 242 243else # need-sub-make 244 245# We process the rest of the Makefile if this is the final invocation of make 246 247ifeq ($(abs_srctree),$(abs_objtree)) 248 # building in the source tree 249 srctree := . 250 building_out_of_srctree := 251else 252 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 253 # building in a subdirectory of the source tree 254 srctree := .. 255 else 256 srctree := $(abs_srctree) 257 endif 258 building_out_of_srctree := 1 259endif 260 261ifneq ($(KBUILD_ABS_SRCTREE),) 262srctree := $(abs_srctree) 263endif 264 265objtree := . 266 267VPATH := 268 269ifeq ($(KBUILD_EXTMOD),) 270ifdef building_out_of_srctree 271VPATH := $(srctree) 272endif 273endif 274 275export building_out_of_srctree srctree objtree VPATH 276 277# To make sure we do not include .config for any of the *config targets 278# catch them early, and hand them over to scripts/kconfig/Makefile 279# It is allowed to specify more targets when calling make, including 280# mixing *config targets and build targets. 281# For example 'make oldconfig all'. 282# Detect when mixed targets is specified, and make a second invocation 283# of make so .config is not included in this case either (for *config). 284 285version_h := include/generated/uapi/linux/version.h 286 287clean-targets := %clean mrproper cleandocs 288no-dot-config-targets := $(clean-targets) \ 289 cscope gtags TAGS tags help% %docs check% coccicheck \ 290 $(version_h) headers headers_% archheaders archscripts \ 291 %asm-generic kernelversion %src-pkg dt_binding_check \ 292 outputmakefile rustavailable rustfmt rustfmtcheck 293no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 294 image_name 295single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 296 297config-build := 298mixed-build := 299need-config := 1 300may-sync-config := 1 301single-build := 302 303ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 304 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 305 need-config := 306 endif 307endif 308 309ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 310 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 311 may-sync-config := 312 endif 313endif 314 315need-compiler := $(may-sync-config) 316 317ifneq ($(KBUILD_EXTMOD),) 318 may-sync-config := 319endif 320 321ifeq ($(KBUILD_EXTMOD),) 322 ifneq ($(filter %config,$(MAKECMDGOALS)),) 323 config-build := 1 324 ifneq ($(words $(MAKECMDGOALS)),1) 325 mixed-build := 1 326 endif 327 endif 328endif 329 330# We cannot build single targets and the others at the same time 331ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 332 single-build := 1 333 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 334 mixed-build := 1 335 endif 336endif 337 338# For "make -j clean all", "make -j mrproper defconfig all", etc. 339ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 340 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 341 mixed-build := 1 342 endif 343endif 344 345# install and modules_install need also be processed one by one 346ifneq ($(filter install,$(MAKECMDGOALS)),) 347 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 348 mixed-build := 1 349 endif 350endif 351 352ifdef mixed-build 353# =========================================================================== 354# We're called with mixed targets (*config and build targets). 355# Handle them one by one. 356 357PHONY += $(MAKECMDGOALS) __build_one_by_one 358 359$(MAKECMDGOALS): __build_one_by_one 360 @: 361 362__build_one_by_one: 363 $(Q)set -e; \ 364 for i in $(MAKECMDGOALS); do \ 365 $(MAKE) -f $(srctree)/Makefile $$i; \ 366 done 367 368else # !mixed-build 369 370include $(srctree)/scripts/Kbuild.include 371 372# Read KERNELRELEASE from include/config/kernel.release (if it exists) 373KERNELRELEASE = $(call read-file, include/config/kernel.release) 374KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 375export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 376 377include $(srctree)/scripts/subarch.include 378 379# Cross compiling and selecting different set of gcc/bin-utils 380# --------------------------------------------------------------------------- 381# 382# When performing cross compilation for other architectures ARCH shall be set 383# to the target architecture. (See arch/* for the possibilities). 384# ARCH can be set during invocation of make: 385# make ARCH=arm64 386# Another way is to have ARCH set in the environment. 387# The default ARCH is the host where make is executed. 388 389# CROSS_COMPILE specify the prefix used for all executables used 390# during compilation. Only gcc and related bin-utils executables 391# are prefixed with $(CROSS_COMPILE). 392# CROSS_COMPILE can be set on the command line 393# make CROSS_COMPILE=aarch64-linux-gnu- 394# Alternatively CROSS_COMPILE can be set in the environment. 395# Default value for CROSS_COMPILE is not to prefix executables 396# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 397ARCH ?= $(SUBARCH) 398 399# Architecture as present in compile.h 400UTS_MACHINE := $(ARCH) 401SRCARCH := $(ARCH) 402 403# Additional ARCH settings for x86 404ifeq ($(ARCH),i386) 405 SRCARCH := x86 406endif 407ifeq ($(ARCH),x86_64) 408 SRCARCH := x86 409endif 410 411# Additional ARCH settings for sparc 412ifeq ($(ARCH),sparc32) 413 SRCARCH := sparc 414endif 415ifeq ($(ARCH),sparc64) 416 SRCARCH := sparc 417endif 418 419# Additional ARCH settings for parisc 420ifeq ($(ARCH),parisc64) 421 SRCARCH := parisc 422endif 423 424export cross_compiling := 425ifneq ($(SRCARCH),$(SUBARCH)) 426cross_compiling := 1 427endif 428 429KCONFIG_CONFIG ?= .config 430export KCONFIG_CONFIG 431 432# SHELL used by kbuild 433CONFIG_SHELL := sh 434 435HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 436HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 437HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 438 439ifneq ($(LLVM),) 440ifneq ($(filter %/,$(LLVM)),) 441LLVM_PREFIX := $(LLVM) 442else ifneq ($(filter -%,$(LLVM)),) 443LLVM_SUFFIX := $(LLVM) 444endif 445 446HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 447HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 448else 449HOSTCC = gcc 450HOSTCXX = g++ 451endif 452HOSTRUSTC = rustc 453HOSTPKG_CONFIG = pkg-config 454 455KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 456 -O2 -fomit-frame-pointer -std=gnu11 457KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 458KBUILD_USERLDFLAGS := $(USERLDFLAGS) 459 460# These flags apply to all Rust code in the tree, including the kernel and 461# host programs. 462export rust_common_flags := --edition=2021 \ 463 -Zbinary_dep_depinfo=y \ 464 -Dunsafe_op_in_unsafe_fn \ 465 -Dnon_ascii_idents \ 466 -Wrust_2018_idioms \ 467 -Wunreachable_pub \ 468 -Wmissing_docs \ 469 -Wrustdoc::missing_crate_level_docs \ 470 -Wclippy::correctness -Wclippy::style \ 471 -Wclippy::suspicious -Wclippy::complexity \ 472 -Wclippy::perf \ 473 -Wclippy::let_unit_value -Wclippy::mut_mut \ 474 -Wclippy::needless_bitwise_bool \ 475 -Wclippy::needless_continue \ 476 -Wclippy::no_mangle_with_rust_abi \ 477 -Wclippy::dbg_macro 478 479KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 480KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 481KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 482 -Zallow-features= $(HOSTRUSTFLAGS) 483KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 484KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 485 486# Make variables (CC, etc...) 487CPP = $(CC) -E 488ifneq ($(LLVM),) 489CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 490LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 491AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 492NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 493OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 494OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 495READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 496STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 497else 498CC = $(CROSS_COMPILE)gcc 499LD = $(CROSS_COMPILE)ld 500AR = $(CROSS_COMPILE)ar 501NM = $(CROSS_COMPILE)nm 502OBJCOPY = $(CROSS_COMPILE)objcopy 503OBJDUMP = $(CROSS_COMPILE)objdump 504READELF = $(CROSS_COMPILE)readelf 505STRIP = $(CROSS_COMPILE)strip 506endif 507RUSTC = rustc 508RUSTDOC = rustdoc 509RUSTFMT = rustfmt 510CLIPPY_DRIVER = clippy-driver 511BINDGEN = bindgen 512PAHOLE = pahole 513RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 514LEX = flex 515YACC = bison 516AWK = awk 517INSTALLKERNEL := installkernel 518PERL = perl 519PYTHON3 = python3 520CHECK = sparse 521BASH = bash 522KGZIP = gzip 523KBZIP2 = bzip2 524KLZOP = lzop 525LZMA = lzma 526LZ4 = lz4c 527XZ = xz 528ZSTD = zstd 529 530CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 531 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 532NOSTDINC_FLAGS := 533CFLAGS_MODULE = 534RUSTFLAGS_MODULE = 535AFLAGS_MODULE = 536LDFLAGS_MODULE = 537CFLAGS_KERNEL = 538RUSTFLAGS_KERNEL = 539AFLAGS_KERNEL = 540LDFLAGS_vmlinux = 541 542# Use USERINCLUDE when you must reference the UAPI directories only. 543USERINCLUDE := \ 544 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 545 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 546 -I$(srctree)/include/uapi \ 547 -I$(objtree)/include/generated/uapi \ 548 -include $(srctree)/include/linux/compiler-version.h \ 549 -include $(srctree)/include/linux/kconfig.h 550 551# Use LINUXINCLUDE when you must reference the include/ directory. 552# Needed to be compatible with the O= option 553LINUXINCLUDE := \ 554 -I$(srctree)/arch/$(SRCARCH)/include \ 555 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 556 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 557 -I$(objtree)/include \ 558 $(USERINCLUDE) 559 560KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 561 562KBUILD_CFLAGS := 563KBUILD_CFLAGS += -std=gnu11 564KBUILD_CFLAGS += -fshort-wchar 565KBUILD_CFLAGS += -funsigned-char 566KBUILD_CFLAGS += -fno-common 567KBUILD_CFLAGS += -fno-PIE 568KBUILD_CFLAGS += -fno-strict-aliasing 569 570KBUILD_CPPFLAGS := -D__KERNEL__ 571KBUILD_RUSTFLAGS := $(rust_common_flags) \ 572 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 573 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 574 -Csymbol-mangling-version=v0 \ 575 -Crelocation-model=static \ 576 -Zfunction-sections=n \ 577 -Wclippy::float_arithmetic 578 579KBUILD_AFLAGS_KERNEL := 580KBUILD_CFLAGS_KERNEL := 581KBUILD_RUSTFLAGS_KERNEL := 582KBUILD_AFLAGS_MODULE := -DMODULE 583KBUILD_CFLAGS_MODULE := -DMODULE 584KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 585KBUILD_LDFLAGS_MODULE := 586KBUILD_LDFLAGS := 587CLANG_FLAGS := 588 589ifeq ($(KBUILD_CLIPPY),1) 590 RUSTC_OR_CLIPPY_QUIET := CLIPPY 591 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 592else 593 RUSTC_OR_CLIPPY_QUIET := RUSTC 594 RUSTC_OR_CLIPPY = $(RUSTC) 595endif 596 597ifdef RUST_LIB_SRC 598 export RUST_LIB_SRC 599endif 600 601# Allows the usage of unstable features in stable compilers. 602export RUSTC_BOOTSTRAP := 1 603 604export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 605export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 606export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 607export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 608export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 609export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 610export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 611export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 612 613export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 614export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 615export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 616export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 617export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 618export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 619 620# Files to ignore in find ... statements 621 622export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 623 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 624 -prune -o 625 626# =========================================================================== 627# Rules shared between *config targets and build targets 628 629# Basic helpers built in scripts/basic/ 630PHONY += scripts_basic 631scripts_basic: 632 $(Q)$(MAKE) $(build)=scripts/basic 633 634PHONY += outputmakefile 635ifdef building_out_of_srctree 636# Before starting out-of-tree build, make sure the source tree is clean. 637# outputmakefile generates a Makefile in the output directory, if using a 638# separate output directory. This allows convenient use of make in the 639# output directory. 640# At the same time when output Makefile generated, generate .gitignore to 641# ignore whole output directory 642 643quiet_cmd_makefile = GEN Makefile 644 cmd_makefile = { \ 645 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 646 echo "include $(srctree)/Makefile"; \ 647 } > Makefile 648 649outputmakefile: 650 @if [ -f $(srctree)/.config -o \ 651 -d $(srctree)/include/config -o \ 652 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 653 echo >&2 "***"; \ 654 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 655 echo >&2 "*** in $(abs_srctree)";\ 656 echo >&2 "***"; \ 657 false; \ 658 fi 659 $(Q)ln -fsn $(srctree) source 660 $(call cmd,makefile) 661 $(Q)test -e .gitignore || \ 662 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 663endif 664 665# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 666# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 667# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 668# and from include/config/auto.conf.cmd to detect the compiler upgrade. 669CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 670 671ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 672include $(srctree)/scripts/Makefile.clang 673endif 674 675# Include this also for config targets because some architectures need 676# cc-cross-prefix to determine CROSS_COMPILE. 677ifdef need-compiler 678include $(srctree)/scripts/Makefile.compiler 679endif 680 681ifdef config-build 682# =========================================================================== 683# *config targets only - make sure prerequisites are updated, and descend 684# in scripts/kconfig to make the *config target 685 686# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 687# KBUILD_DEFCONFIG may point out an alternative default configuration 688# used for 'make defconfig' 689include $(srctree)/arch/$(SRCARCH)/Makefile 690export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 691 692config: outputmakefile scripts_basic FORCE 693 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 694 695%config: outputmakefile scripts_basic FORCE 696 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 697 698else #!config-build 699# =========================================================================== 700# Build targets only - this includes vmlinux, arch-specific targets, clean 701# targets and others. In general all targets except *config targets. 702 703# If building an external module we do not care about the all: rule 704# but instead __all depend on modules 705PHONY += all 706ifeq ($(KBUILD_EXTMOD),) 707__all: all 708else 709__all: modules 710endif 711 712targets := 713 714# Decide whether to build built-in, modular, or both. 715# Normally, just do built-in. 716 717KBUILD_MODULES := 718KBUILD_BUILTIN := 1 719 720# If we have only "make modules", don't compile built-in objects. 721ifeq ($(MAKECMDGOALS),modules) 722 KBUILD_BUILTIN := 723endif 724 725# If we have "make <whatever> modules", compile modules 726# in addition to whatever we do anyway. 727# Just "make" or "make all" shall build modules as well 728 729ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 730 KBUILD_MODULES := 1 731endif 732 733ifeq ($(MAKECMDGOALS),) 734 KBUILD_MODULES := 1 735endif 736 737export KBUILD_MODULES KBUILD_BUILTIN 738 739ifdef need-config 740include include/config/auto.conf 741endif 742 743ifeq ($(KBUILD_EXTMOD),) 744# Objects we will link into vmlinux / subdirs we need to visit 745core-y := 746drivers-y := 747libs-y := lib/ 748endif # KBUILD_EXTMOD 749 750# The all: target is the default when no target is given on the 751# command line. 752# This allow a user to issue only 'make' to build a kernel including modules 753# Defaults to vmlinux, but the arch makefile usually adds further targets 754all: vmlinux 755 756CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 757ifdef CONFIG_CC_IS_GCC 758CFLAGS_GCOV += -fno-tree-loop-im 759endif 760export CFLAGS_GCOV 761 762# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 763ifdef CONFIG_FUNCTION_TRACER 764 CC_FLAGS_FTRACE := -pg 765endif 766 767include $(srctree)/arch/$(SRCARCH)/Makefile 768 769ifdef need-config 770ifdef may-sync-config 771# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 772# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 773# because some architectures define CROSS_COMPILE there. 774include include/config/auto.conf.cmd 775 776$(KCONFIG_CONFIG): 777 @echo >&2 '***' 778 @echo >&2 '*** Configuration file "$@" not found!' 779 @echo >&2 '***' 780 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 781 @echo >&2 '*** "make menuconfig" or "make xconfig").' 782 @echo >&2 '***' 783 @/bin/false 784 785# The actual configuration files used during the build are stored in 786# include/generated/ and include/config/. Update them if .config is newer than 787# include/config/auto.conf (which mirrors .config). 788# 789# This exploits the 'multi-target pattern rule' trick. 790# The syncconfig should be executed only once to make all the targets. 791# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 792# 793# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 794# so you cannot notice that Kconfig is waiting for the user input. 795%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 796 $(Q)$(kecho) " SYNC $@" 797 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 798else # !may-sync-config 799# External modules and some install targets need include/generated/autoconf.h 800# and include/config/auto.conf but do not care if they are up-to-date. 801# Use auto.conf to trigger the test 802PHONY += include/config/auto.conf 803 804include/config/auto.conf: 805 @test -e include/generated/autoconf.h -a -e $@ || ( \ 806 echo >&2; \ 807 echo >&2 " ERROR: Kernel configuration is invalid."; \ 808 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 809 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 810 echo >&2 ; \ 811 /bin/false) 812 813endif # may-sync-config 814endif # need-config 815 816KBUILD_CFLAGS += -fno-delete-null-pointer-checks 817 818ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 819KBUILD_CFLAGS += -O2 820KBUILD_RUSTFLAGS += -Copt-level=2 821else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 822KBUILD_CFLAGS += -Os 823KBUILD_RUSTFLAGS += -Copt-level=s 824endif 825 826# Always set `debug-assertions` and `overflow-checks` because their default 827# depends on `opt-level` and `debug-assertions`, respectively. 828KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 829KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 830 831# Tell gcc to never replace conditional load with a non-conditional one 832ifdef CONFIG_CC_IS_GCC 833# gcc-10 renamed --param=allow-store-data-races=0 to 834# -fno-allow-store-data-races. 835KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 836KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 837endif 838 839ifdef CONFIG_READABLE_ASM 840# Disable optimizations that make assembler listings hard to read. 841# reorder blocks reorders the control in the function 842# ipa clone creates specialized cloned functions 843# partial inlining inlines only parts of functions 844KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 845endif 846 847stackp-flags-y := -fno-stack-protector 848stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 849stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 850 851KBUILD_CFLAGS += $(stackp-flags-y) 852 853KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 854KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 855 856ifdef CONFIG_FRAME_POINTER 857KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 858KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 859else 860# Some targets (ARM with Thumb2, for example), can't be built with frame 861# pointers. For those, we don't have FUNCTION_TRACER automatically 862# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 863# incompatible with -fomit-frame-pointer with current GCC, so we don't use 864# -fomit-frame-pointer with FUNCTION_TRACER. 865# In the Rust target specification, "frame-pointer" is set explicitly 866# to "may-omit". 867ifndef CONFIG_FUNCTION_TRACER 868KBUILD_CFLAGS += -fomit-frame-pointer 869endif 870endif 871 872# Initialize all stack variables with a 0xAA pattern. 873ifdef CONFIG_INIT_STACK_ALL_PATTERN 874KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 875endif 876 877# Initialize all stack variables with a zero value. 878ifdef CONFIG_INIT_STACK_ALL_ZERO 879KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 880ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 881# https://github.com/llvm/llvm-project/issues/44842 882CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 883export CC_AUTO_VAR_INIT_ZERO_ENABLER 884KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 885endif 886endif 887 888# While VLAs have been removed, GCC produces unreachable stack probes 889# for the randomize_kstack_offset feature. Disable it for all compilers. 890KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 891 892# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 893ifdef CONFIG_ZERO_CALL_USED_REGS 894KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 895endif 896 897ifdef CONFIG_FUNCTION_TRACER 898ifdef CONFIG_FTRACE_MCOUNT_USE_CC 899 CC_FLAGS_FTRACE += -mrecord-mcount 900 ifdef CONFIG_HAVE_NOP_MCOUNT 901 ifeq ($(call cc-option-yn, -mnop-mcount),y) 902 CC_FLAGS_FTRACE += -mnop-mcount 903 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 904 endif 905 endif 906endif 907ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 908 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 909 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 910 endif 911endif 912ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 913 ifdef CONFIG_HAVE_C_RECORDMCOUNT 914 BUILD_C_RECORDMCOUNT := y 915 export BUILD_C_RECORDMCOUNT 916 endif 917endif 918ifdef CONFIG_HAVE_FENTRY 919 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 920 ifeq ($(call cc-option-yn, -mfentry),y) 921 CC_FLAGS_FTRACE += -mfentry 922 CC_FLAGS_USING += -DCC_USING_FENTRY 923 endif 924endif 925export CC_FLAGS_FTRACE 926KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 927KBUILD_AFLAGS += $(CC_FLAGS_USING) 928endif 929 930# We trigger additional mismatches with less inlining 931ifdef CONFIG_DEBUG_SECTION_MISMATCH 932KBUILD_CFLAGS += -fno-inline-functions-called-once 933endif 934 935# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 936ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 937KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 938KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 939LDFLAGS_vmlinux += --gc-sections 940endif 941 942ifdef CONFIG_SHADOW_CALL_STACK 943ifndef CONFIG_DYNAMIC_SCS 944CC_FLAGS_SCS := -fsanitize=shadow-call-stack 945KBUILD_CFLAGS += $(CC_FLAGS_SCS) 946endif 947export CC_FLAGS_SCS 948endif 949 950ifdef CONFIG_LTO_CLANG 951ifdef CONFIG_LTO_CLANG_THIN 952CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 953else 954CC_FLAGS_LTO := -flto 955endif 956CC_FLAGS_LTO += -fvisibility=hidden 957 958# Limit inlining across translation units to reduce binary size 959KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 960endif 961 962ifdef CONFIG_LTO 963KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 964KBUILD_AFLAGS += -fno-lto 965export CC_FLAGS_LTO 966endif 967 968ifdef CONFIG_CFI_CLANG 969CC_FLAGS_CFI := -fsanitize=kcfi 970KBUILD_CFLAGS += $(CC_FLAGS_CFI) 971export CC_FLAGS_CFI 972endif 973 974# Architectures can define flags to add/remove for floating-point support 975CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 976export CC_FLAGS_FPU 977export CC_FLAGS_NO_FPU 978 979ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 980# Set the minimal function alignment. Use the newer GCC option 981# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 982# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 983ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 984KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 985else 986KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 987endif 988endif 989 990# arch Makefile may override CC so keep this after arch Makefile is included 991NOSTDINC_FLAGS += -nostdinc 992 993# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 994# the kernel uses only C99 flexible arrays for dynamically sized trailing 995# arrays. Enforce this for everything that may examine structure sizes and 996# perform bounds checking. 997KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 998 999#Currently, disable -Wstringop-overflow for GCC 11, globally. 1000KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1001KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1002 1003# disable invalid "can't wrap" optimizations for signed / pointers 1004KBUILD_CFLAGS += -fno-strict-overflow 1005 1006# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1007KBUILD_CFLAGS += -fno-stack-check 1008 1009# conserve stack if available 1010ifdef CONFIG_CC_IS_GCC 1011KBUILD_CFLAGS += -fconserve-stack 1012endif 1013 1014# change __FILE__ to the relative path from the srctree 1015KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1016 1017# include additional Makefiles when needed 1018include-y := scripts/Makefile.extrawarn 1019include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1020include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1021include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1022include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1023include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1024include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1025include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1026include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1027include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1028 1029include $(addprefix $(srctree)/, $(include-y)) 1030 1031# scripts/Makefile.gcc-plugins is intentionally included last. 1032# Do not add $(call cc-option,...) below this line. When you build the kernel 1033# from the clean source tree, the GCC plugins do not exist at this point. 1034 1035# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1036KBUILD_CPPFLAGS += $(KCPPFLAGS) 1037KBUILD_AFLAGS += $(KAFLAGS) 1038KBUILD_CFLAGS += $(KCFLAGS) 1039KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1040 1041KBUILD_LDFLAGS_MODULE += --build-id=sha1 1042LDFLAGS_vmlinux += --build-id=sha1 1043 1044KBUILD_LDFLAGS += -z noexecstack 1045ifeq ($(CONFIG_LD_IS_BFD),y) 1046KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1047endif 1048 1049ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1050LDFLAGS_vmlinux += -X 1051endif 1052 1053ifeq ($(CONFIG_RELR),y) 1054# ld.lld before 15 did not support -z pack-relative-relocs. 1055LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1056endif 1057 1058# We never want expected sections to be placed heuristically by the 1059# linker. All sections should be explicitly named in the linker script. 1060ifdef CONFIG_LD_ORPHAN_WARN 1061LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1062endif 1063 1064# Align the bit size of userspace programs with the kernel 1065KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1066KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1067 1068# make the checker run with the right architecture 1069CHECKFLAGS += --arch=$(ARCH) 1070 1071# insure the checker run with the right endianness 1072CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1073 1074# the checker needs the correct machine size 1075CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1076 1077# Default kernel image to build when no specific target is given. 1078# KBUILD_IMAGE may be overruled on the command line or 1079# set in the environment 1080# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1081# this default value 1082export KBUILD_IMAGE ?= vmlinux 1083 1084# 1085# INSTALL_PATH specifies where to place the updated kernel and system map 1086# images. Default is /boot, but you can set it to other values 1087export INSTALL_PATH ?= /boot 1088 1089# 1090# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1091# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1092# an argument if needed. Otherwise it defaults to the kernel install path 1093# 1094export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1095 1096# 1097# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1098# relocations required by build roots. This is not defined in the 1099# makefile but the argument can be passed to make if needed. 1100# 1101 1102MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1103export MODLIB 1104 1105PHONY += prepare0 1106 1107export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1108export MODORDER := $(extmod_prefix)modules.order 1109export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1110 1111ifeq ($(KBUILD_EXTMOD),) 1112 1113build-dir := . 1114clean-dirs := $(sort . Documentation \ 1115 $(patsubst %/,%,$(filter %/, $(core-) \ 1116 $(drivers-) $(libs-)))) 1117 1118export ARCH_CORE := $(core-y) 1119export ARCH_LIB := $(filter %/, $(libs-y)) 1120export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1121# Externally visible symbols (used by link-vmlinux.sh) 1122 1123KBUILD_VMLINUX_OBJS := ./built-in.a 1124ifdef CONFIG_MODULES 1125KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1126KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1127else 1128KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1129endif 1130 1131export KBUILD_VMLINUX_LIBS 1132export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1133 1134ifdef CONFIG_TRIM_UNUSED_KSYMS 1135# For the kernel to actually contain only the needed exported symbols, 1136# we have to build modules as well to determine what those symbols are. 1137KBUILD_MODULES := 1 1138endif 1139 1140# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1141quiet_cmd_ar_vmlinux.a = AR $@ 1142 cmd_ar_vmlinux.a = \ 1143 rm -f $@; \ 1144 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1145 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1146 1147targets += vmlinux.a 1148vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1149 $(call if_changed,ar_vmlinux.a) 1150 1151PHONY += vmlinux_o 1152vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1153 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1154 1155vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1156 @: 1157 1158PHONY += vmlinux 1159# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1160# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1161# unrelated; the decompressors just happen to have the same base name, 1162# arch/*/boot/compressed/vmlinux. 1163# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1164# 1165# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1166# https://savannah.gnu.org/bugs/?61463 1167# For Make > 4.4, the following simple code will work: 1168# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1169vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1170vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1171vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1173 1174# The actual objects are generated when descending, 1175# make sure no implicit rule kicks in 1176$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1177 1178ifeq ($(origin KERNELRELEASE),file) 1179filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1180else 1181filechk_kernel.release = echo $(KERNELRELEASE) 1182endif 1183 1184# Store (new) KERNELRELEASE string in include/config/kernel.release 1185include/config/kernel.release: FORCE 1186 $(call filechk,kernel.release) 1187 1188# Additional helpers built in scripts/ 1189# Carefully list dependencies so we do not try to build scripts twice 1190# in parallel 1191PHONY += scripts 1192scripts: scripts_basic scripts_dtc 1193 $(Q)$(MAKE) $(build)=$(@) 1194 1195# Things we need to do before we recursively start building the kernel 1196# or the modules are listed in "prepare". 1197# A multi level approach is used. prepareN is processed before prepareN-1. 1198# archprepare is used in arch Makefiles and when processed asm symlink, 1199# version.h and scripts_basic is processed / created. 1200 1201PHONY += prepare archprepare 1202 1203archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1204 asm-generic $(version_h) include/generated/utsrelease.h \ 1205 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1206 1207prepare0: archprepare 1208 $(Q)$(MAKE) $(build)=scripts/mod 1209 $(Q)$(MAKE) $(build)=. prepare 1210 1211# All the preparing.. 1212prepare: prepare0 1213ifdef CONFIG_RUST 1214 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1215 $(Q)$(MAKE) $(build)=rust 1216endif 1217 1218PHONY += remove-stale-files 1219remove-stale-files: 1220 $(Q)$(srctree)/scripts/remove-stale-files 1221 1222# Support for using generic headers in asm-generic 1223asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1224 1225PHONY += asm-generic uapi-asm-generic 1226asm-generic: uapi-asm-generic 1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1228 generic=include/asm-generic 1229uapi-asm-generic: 1230 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1231 generic=include/uapi/asm-generic 1232 1233# Generate some files 1234# --------------------------------------------------------------------------- 1235 1236# KERNELRELEASE can change from a few different places, meaning version.h 1237# needs to be updated, so this check is forced on all builds 1238 1239uts_len := 64 1240define filechk_utsrelease.h 1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1243 exit 1; \ 1244 fi; \ 1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1246endef 1247 1248define filechk_version.h 1249 if [ $(SUBLEVEL) -gt 255 ]; then \ 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1252 else \ 1253 echo \#define LINUX_VERSION_CODE $(shell \ 1254 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1255 fi; \ 1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1257 ((c) > 255 ? 255 : (c)))'; \ 1258 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1259 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1260 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1261endef 1262 1263$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1264$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1265$(version_h): FORCE 1266 $(call filechk,version.h) 1267 1268include/generated/utsrelease.h: include/config/kernel.release FORCE 1269 $(call filechk,utsrelease.h) 1270 1271filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1272 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1273 1274include/generated/compile.h: FORCE 1275 $(call filechk,compile.h) 1276 1277PHONY += headerdep 1278headerdep: 1279 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1280 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1281 1282# --------------------------------------------------------------------------- 1283# Kernel headers 1284 1285#Default location for installed headers 1286export INSTALL_HDR_PATH = $(objtree)/usr 1287 1288quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1289 cmd_headers_install = \ 1290 mkdir -p $(INSTALL_HDR_PATH); \ 1291 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1292 usr/include $(INSTALL_HDR_PATH) 1293 1294PHONY += headers_install 1295headers_install: headers 1296 $(call cmd,headers_install) 1297 1298PHONY += archheaders archscripts 1299 1300hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1301 1302PHONY += headers 1303headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1304 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1305 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1306 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1307 1308ifdef CONFIG_HEADERS_INSTALL 1309prepare: headers 1310endif 1311 1312PHONY += scripts_unifdef 1313scripts_unifdef: scripts_basic 1314 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1315 1316# --------------------------------------------------------------------------- 1317# Install 1318 1319# Many distributions have the custom install script, /sbin/installkernel. 1320# If DKMS is installed, 'make install' will eventually recurse back 1321# to this Makefile to build and install external modules. 1322# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1323 1324quiet_cmd_install = INSTALL $(INSTALL_PATH) 1325 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1326 1327# --------------------------------------------------------------------------- 1328# vDSO install 1329 1330PHONY += vdso_install 1331vdso_install: export INSTALL_FILES = $(vdso-install-y) 1332vdso_install: 1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1334 1335# --------------------------------------------------------------------------- 1336# Tools 1337 1338ifdef CONFIG_OBJTOOL 1339prepare: tools/objtool 1340endif 1341 1342ifdef CONFIG_BPF 1343ifdef CONFIG_DEBUG_INFO_BTF 1344prepare: tools/bpf/resolve_btfids 1345endif 1346endif 1347 1348PHONY += resolve_btfids_clean 1349 1350resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1351 1352# tools/bpf/resolve_btfids directory might not exist 1353# in output directory, skip its clean in that case 1354resolve_btfids_clean: 1355ifneq ($(wildcard $(resolve_btfids_O)),) 1356 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1357endif 1358 1359# Clear a bunch of variables before executing the submake 1360ifeq ($(quiet),silent_) 1361tools_silent=s 1362endif 1363 1364tools/: FORCE 1365 $(Q)mkdir -p $(objtree)/tools 1366 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1367 1368tools/%: FORCE 1369 $(Q)mkdir -p $(objtree)/tools 1370 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1371 1372# --------------------------------------------------------------------------- 1373# Kernel selftest 1374 1375PHONY += kselftest 1376kselftest: headers 1377 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1378 1379kselftest-%: headers FORCE 1380 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1381 1382PHONY += kselftest-merge 1383kselftest-merge: 1384 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1385 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1386 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1387 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1388 1389# --------------------------------------------------------------------------- 1390# Devicetree files 1391 1392ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1393dtstree := arch/$(SRCARCH)/boot/dts 1394endif 1395 1396ifneq ($(dtstree),) 1397 1398%.dtb: dtbs_prepare 1399 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1400 1401%.dtbo: dtbs_prepare 1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1403 1404PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1405dtbs: dtbs_prepare 1406 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1407 1408# include/config/kernel.release is actually needed when installing DTBs because 1409# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1410# dtbs_install depend on it as dtbs_install may run as root. 1411dtbs_prepare: include/config/kernel.release scripts_dtc 1412 1413ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1414export CHECK_DTBS=y 1415endif 1416 1417ifneq ($(CHECK_DTBS),) 1418dtbs_prepare: dt_binding_schemas 1419endif 1420 1421dtbs_check: dtbs 1422 1423dtbs_install: 1424 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1425 1426ifdef CONFIG_OF_EARLY_FLATTREE 1427all: dtbs 1428endif 1429 1430endif 1431 1432PHONY += scripts_dtc 1433scripts_dtc: scripts_basic 1434 $(Q)$(MAKE) $(build)=scripts/dtc 1435 1436ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1437export CHECK_DTBS=y 1438endif 1439 1440PHONY += dt_binding_check dt_binding_schemas 1441dt_binding_check: dt_binding_schemas scripts_dtc 1442 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1443 1444dt_binding_schemas: 1445 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1446 1447PHONY += dt_compatible_check 1448dt_compatible_check: dt_binding_schemas 1449 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1450 1451# --------------------------------------------------------------------------- 1452# Modules 1453 1454ifdef CONFIG_MODULES 1455 1456# By default, build modules as well 1457 1458all: modules 1459 1460# When we're building modules with modversions, we need to consider 1461# the built-in objects during the descend as well, in order to 1462# make sure the checksums are up to date before we record them. 1463ifdef CONFIG_MODVERSIONS 1464 KBUILD_BUILTIN := 1 1465endif 1466 1467# Build modules 1468# 1469 1470# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1471# is an exception. 1472ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1473KBUILD_BUILTIN := 1 1474modules: vmlinux 1475endif 1476 1477modules: modules_prepare 1478 1479# Target to prepare building external modules 1480modules_prepare: prepare 1481 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1482 1483endif # CONFIG_MODULES 1484 1485### 1486# Cleaning is done on three levels. 1487# make clean Delete most generated files 1488# Leave enough to build external modules 1489# make mrproper Delete the current configuration, and all generated files 1490# make distclean Remove editor backup files, patch leftover files and the like 1491 1492# Directories & files removed with 'make clean' 1493CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1494 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1495 compile_commands.json rust/test \ 1496 rust-project.json .vmlinux.objs .vmlinux.export.c 1497 1498# Directories & files removed with 'make mrproper' 1499MRPROPER_FILES += include/config include/generated \ 1500 arch/$(SRCARCH)/include/generated .objdiff \ 1501 debian snap tar-install \ 1502 .config .config.old .version \ 1503 Module.symvers \ 1504 certs/signing_key.pem \ 1505 certs/x509.genkey \ 1506 vmlinux-gdb.py \ 1507 rpmbuild \ 1508 rust/libmacros.so 1509 1510# clean - Delete most, but leave enough to build external modules 1511# 1512clean: private rm-files := $(CLEAN_FILES) 1513 1514PHONY += archclean vmlinuxclean 1515 1516vmlinuxclean: 1517 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1518 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1519 1520clean: archclean vmlinuxclean resolve_btfids_clean 1521 1522# mrproper - Delete all generated files, including .config 1523# 1524mrproper: private rm-files := $(MRPROPER_FILES) 1525mrproper-dirs := $(addprefix _mrproper_,scripts) 1526 1527PHONY += $(mrproper-dirs) mrproper 1528$(mrproper-dirs): 1529 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1530 1531mrproper: clean $(mrproper-dirs) 1532 $(call cmd,rmfiles) 1533 @find . $(RCS_FIND_IGNORE) \ 1534 \( -name '*.rmeta' \) \ 1535 -type f -print | xargs rm -f 1536 1537# distclean 1538# 1539PHONY += distclean 1540 1541distclean: mrproper 1542 @find . $(RCS_FIND_IGNORE) \ 1543 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1544 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1545 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1546 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1547 -type f -print | xargs rm -f 1548 1549 1550# Packaging of the kernel to various formats 1551# --------------------------------------------------------------------------- 1552 1553%src-pkg: FORCE 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1555%pkg: include/config/kernel.release FORCE 1556 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1557 1558# Brief documentation of the typical targets used 1559# --------------------------------------------------------------------------- 1560 1561boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1562boards := $(sort $(notdir $(boards))) 1563board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1564board-dirs := $(sort $(notdir $(board-dirs:/=))) 1565 1566PHONY += help 1567help: 1568 @echo 'Cleaning targets:' 1569 @echo ' clean - Remove most generated files but keep the config and' 1570 @echo ' enough build support to build external modules' 1571 @echo ' mrproper - Remove all generated files + config + various backup files' 1572 @echo ' distclean - mrproper + remove editor backup and patch files' 1573 @echo '' 1574 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1575 @echo '' 1576 @echo 'Other generic targets:' 1577 @echo ' all - Build all targets marked with [*]' 1578 @echo '* vmlinux - Build the bare kernel' 1579 @echo '* modules - Build all modules' 1580 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1581 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1582 @echo ' dir/ - Build all files in dir and below' 1583 @echo ' dir/file.[ois] - Build specified target only' 1584 @echo ' dir/file.ll - Build the LLVM assembly file' 1585 @echo ' (requires compiler support for LLVM assembly generation)' 1586 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1587 @echo ' (requires a recent binutils and recent build (System.map))' 1588 @echo ' dir/file.ko - Build module including final link' 1589 @echo ' modules_prepare - Set up for building external modules' 1590 @echo ' tags/TAGS - Generate tags file for editors' 1591 @echo ' cscope - Generate cscope index' 1592 @echo ' gtags - Generate GNU GLOBAL index' 1593 @echo ' kernelrelease - Output the release version string (use with make -s)' 1594 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1595 @echo ' image_name - Output the image name (use with make -s)' 1596 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1597 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1598 echo '' 1599 @echo 'Static analysers:' 1600 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1601 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1602 @echo ' versioncheck - Sanity check on version.h usage' 1603 @echo ' includecheck - Check for duplicate included header files' 1604 @echo ' export_report - List the usages of all exported symbols' 1605 @echo ' headerdep - Detect inclusion cycles in headers' 1606 @echo ' coccicheck - Check with Coccinelle' 1607 @echo ' clang-analyzer - Check with clang static analyzer' 1608 @echo ' clang-tidy - Check with clang-tidy' 1609 @echo '' 1610 @echo 'Tools:' 1611 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1612 @echo '' 1613 @echo 'Kernel selftest:' 1614 @echo ' kselftest - Build and run kernel selftest' 1615 @echo ' Build, install, and boot kernel before' 1616 @echo ' running kselftest on it' 1617 @echo ' Run as root for full coverage' 1618 @echo ' kselftest-all - Build kernel selftest' 1619 @echo ' kselftest-install - Build and install kernel selftest' 1620 @echo ' kselftest-clean - Remove all generated kselftest files' 1621 @echo ' kselftest-merge - Merge all the config dependencies of' 1622 @echo ' kselftest to existing .config.' 1623 @echo '' 1624 @echo 'Rust targets:' 1625 @echo ' rustavailable - Checks whether the Rust toolchain is' 1626 @echo ' available and, if not, explains why.' 1627 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1628 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1629 @echo ' is formatted, printing a diff otherwise.' 1630 @echo ' rustdoc - Generate Rust documentation' 1631 @echo ' (requires kernel .config)' 1632 @echo ' rusttest - Runs the Rust tests' 1633 @echo ' (requires kernel .config; downloads external repos)' 1634 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1635 @echo ' (requires kernel .config)' 1636 @echo ' dir/file.[os] - Build specified target only' 1637 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1638 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1639 @echo ' The output is not intended to be compilable.' 1640 @echo ' dir/file.ll - Build the LLVM assembly file' 1641 @echo '' 1642 @$(if $(dtstree), \ 1643 echo 'Devicetree:'; \ 1644 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1645 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1646 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1647 echo ' dt_binding_schema - Build processed device tree binding schemas'; \ 1648 echo ' dtbs_check - Validate device tree source files';\ 1649 echo '') 1650 1651 @echo 'Userspace tools targets:' 1652 @echo ' use "make tools/help"' 1653 @echo ' or "cd tools; make help"' 1654 @echo '' 1655 @echo 'Kernel packaging:' 1656 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1657 @echo '' 1658 @echo 'Documentation targets:' 1659 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1660 @echo '' 1661 @echo 'Architecture-specific targets ($(SRCARCH)):' 1662 @$(or $(archhelp),\ 1663 echo ' No architecture-specific help defined for $(SRCARCH)') 1664 @echo '' 1665 @$(if $(boards), \ 1666 $(foreach b, $(boards), \ 1667 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1668 echo '') 1669 @$(if $(board-dirs), \ 1670 $(foreach b, $(board-dirs), \ 1671 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1672 printf " %-16s - Show all of the above\\n" help-boards; \ 1673 echo '') 1674 1675 @echo ' make V=n [targets] 1: verbose build' 1676 @echo ' 2: give reason for rebuild of target' 1677 @echo ' V=1 and V=2 can be combined with V=12' 1678 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1679 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1680 @echo ' (sparse by default)' 1681 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1682 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1683 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1684 @echo ' 1: warnings which may be relevant and do not occur too often' 1685 @echo ' 2: warnings which occur quite often but may still be relevant' 1686 @echo ' 3: more obscure warnings, can most likely be ignored' 1687 @echo ' c: extra checks in the configuration stage (Kconfig)' 1688 @echo ' e: warnings are being treated as errors' 1689 @echo ' Multiple levels can be combined with W=12 or W=123' 1690 @$(if $(dtstree), \ 1691 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1692 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1693 ) 1694 @echo '' 1695 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1696 @echo 'For further info see the ./README file' 1697 1698 1699help-board-dirs := $(addprefix help-,$(board-dirs)) 1700 1701help-boards: $(help-board-dirs) 1702 1703boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1704 1705$(help-board-dirs): help-%: 1706 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1707 @$(if $(boards-per-dir), \ 1708 $(foreach b, $(boards-per-dir), \ 1709 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1710 echo '') 1711 1712 1713# Documentation targets 1714# --------------------------------------------------------------------------- 1715DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1716 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1717PHONY += $(DOC_TARGETS) 1718$(DOC_TARGETS): 1719 $(Q)$(MAKE) $(build)=Documentation $@ 1720 1721 1722# Rust targets 1723# --------------------------------------------------------------------------- 1724 1725# "Is Rust available?" target 1726PHONY += rustavailable 1727rustavailable: 1728 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1729 1730# Documentation target 1731# 1732# Using the singular to avoid running afoul of `no-dot-config-targets`. 1733PHONY += rustdoc 1734rustdoc: prepare 1735 $(Q)$(MAKE) $(build)=rust $@ 1736 1737# Testing target 1738PHONY += rusttest 1739rusttest: prepare 1740 $(Q)$(MAKE) $(build)=rust $@ 1741 1742# Formatting targets 1743PHONY += rustfmt rustfmtcheck 1744 1745# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1746# 1747# We match using absolute paths since `find` does not resolve them 1748# when matching, which is a problem when e.g. `srctree` is `..`. 1749# We `grep` afterwards in order to remove the directory entry itself. 1750rustfmt: 1751 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1752 -o -path $(abs_srctree)/rust/alloc -prune \ 1753 -o -path $(abs_objtree)/rust/test -prune \ 1754 | grep -Fv $(abs_srctree)/rust/alloc \ 1755 | grep -Fv $(abs_objtree)/rust/test \ 1756 | grep -Fv generated \ 1757 | xargs $(RUSTFMT) $(rustfmt_flags) 1758 1759rustfmtcheck: rustfmt_flags = --check 1760rustfmtcheck: rustfmt 1761 1762# Misc 1763# --------------------------------------------------------------------------- 1764 1765PHONY += misc-check 1766misc-check: 1767 $(Q)$(srctree)/scripts/misc-check 1768 1769all: misc-check 1770 1771PHONY += scripts_gdb 1772scripts_gdb: prepare0 1773 $(Q)$(MAKE) $(build)=scripts/gdb 1774 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1775 1776ifdef CONFIG_GDB_SCRIPTS 1777all: scripts_gdb 1778endif 1779 1780else # KBUILD_EXTMOD 1781 1782filechk_kernel.release = echo $(KERNELRELEASE) 1783 1784### 1785# External module support. 1786# When building external modules the kernel used as basis is considered 1787# read-only, and no consistency checks are made and the make 1788# system is not used on the basis kernel. If updates are required 1789# in the basis kernel ordinary make commands (without M=...) must be used. 1790 1791# We are always building only modules. 1792KBUILD_BUILTIN := 1793KBUILD_MODULES := 1 1794 1795build-dir := $(KBUILD_EXTMOD) 1796 1797compile_commands.json: $(extmod_prefix)compile_commands.json 1798PHONY += compile_commands.json 1799 1800clean-dirs := $(KBUILD_EXTMOD) 1801clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1802 $(KBUILD_EXTMOD)/compile_commands.json 1803 1804PHONY += prepare 1805# now expand this into a simple variable to reduce the cost of shell evaluations 1806prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1807prepare: 1808 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1809 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1810 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1811 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1812 fi 1813 1814PHONY += help 1815help: 1816 @echo ' Building external modules.' 1817 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1818 @echo '' 1819 @echo ' modules - default target, build the module(s)' 1820 @echo ' modules_install - install the module' 1821 @echo ' clean - remove generated files in module directory only' 1822 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1823 @echo '' 1824 1825ifndef CONFIG_MODULES 1826modules modules_install: __external_modules_error 1827__external_modules_error: 1828 @echo >&2 '***' 1829 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1830 @echo >&2 '*** You cannot build or install external modules.' 1831 @echo >&2 '***' 1832 @false 1833endif 1834 1835endif # KBUILD_EXTMOD 1836 1837# --------------------------------------------------------------------------- 1838# Modules 1839 1840PHONY += modules modules_install modules_sign modules_prepare 1841 1842modules_install: 1843 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1844 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1845 1846ifeq ($(CONFIG_MODULE_SIG),y) 1847# modules_sign is a subset of modules_install. 1848# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1849modules_sign: modules_install 1850 @: 1851else 1852modules_sign: 1853 @echo >&2 '***' 1854 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1855 @echo >&2 '***' 1856 @false 1857endif 1858 1859ifdef CONFIG_MODULES 1860 1861$(MODORDER): $(build-dir) 1862 @: 1863 1864# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1865# This is solely useful to speed up test compiles. 1866modules: modpost 1867ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1868 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1869endif 1870 1871PHONY += modules_check 1872modules_check: $(MODORDER) 1873 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1874 1875else # CONFIG_MODULES 1876 1877modules: 1878 @: 1879 1880KBUILD_MODULES := 1881 1882endif # CONFIG_MODULES 1883 1884PHONY += modpost 1885modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1886 $(if $(KBUILD_MODULES), modules_check) 1887 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1888 1889# Single targets 1890# --------------------------------------------------------------------------- 1891# To build individual files in subdirectories, you can do like this: 1892# 1893# make foo/bar/baz.s 1894# 1895# The supported suffixes for single-target are listed in 'single-targets' 1896# 1897# To build only under specific subdirectories, you can do like this: 1898# 1899# make foo/bar/baz/ 1900 1901ifdef single-build 1902 1903# .ko is special because modpost is needed 1904single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1905single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1906 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1907 1908$(single-ko): single_modules 1909 @: 1910$(single-no-ko): $(build-dir) 1911 @: 1912 1913# Remove MODORDER when done because it is not the real one. 1914PHONY += single_modules 1915single_modules: $(single-no-ko) modules_prepare 1916 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1917 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1918ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1919 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1920endif 1921 $(Q)rm -f $(MODORDER) 1922 1923single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1924 1925KBUILD_MODULES := 1 1926 1927endif 1928 1929# Preset locale variables to speed up the build process. Limit locale 1930# tweaks to this spot to avoid wrong language settings when running 1931# make menuconfig etc. 1932# Error messages still appears in the original language 1933PHONY += $(build-dir) 1934$(build-dir): prepare 1935 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1936 1937clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1938PHONY += $(clean-dirs) clean 1939$(clean-dirs): 1940 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1941 1942clean: $(clean-dirs) 1943 $(call cmd,rmfiles) 1944 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1945 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1946 -o -name '*.ko.*' \ 1947 -o -name '*.dtb' -o -name '*.dtbo' \ 1948 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1949 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1950 -o -name '*.dwo' -o -name '*.lst' \ 1951 -o -name '*.su' -o -name '*.mod' \ 1952 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1953 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1954 -o -name '*.asn1.[ch]' \ 1955 -o -name '*.symtypes' -o -name 'modules.order' \ 1956 -o -name '*.c.[012]*.*' \ 1957 -o -name '*.ll' \ 1958 -o -name '*.gcno' \ 1959 -o -name '*.*.symversions' \) -type f -print \ 1960 -o -name '.tmp_*' -print \ 1961 | xargs rm -rf 1962 1963# Generate tags for editors 1964# --------------------------------------------------------------------------- 1965quiet_cmd_tags = GEN $@ 1966 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1967 1968tags TAGS cscope gtags: FORCE 1969 $(call cmd,tags) 1970 1971# Generate rust-project.json (a file that describes the structure of non-Cargo 1972# Rust projects) for rust-analyzer (an implementation of the Language Server 1973# Protocol). 1974PHONY += rust-analyzer 1975rust-analyzer: 1976 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1977 $(Q)$(MAKE) $(build)=rust $@ 1978 1979# Script to generate missing namespace dependencies 1980# --------------------------------------------------------------------------- 1981 1982PHONY += nsdeps 1983nsdeps: export KBUILD_NSDEPS=1 1984nsdeps: modules 1985 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1986 1987# Clang Tooling 1988# --------------------------------------------------------------------------- 1989 1990quiet_cmd_gen_compile_commands = GEN $@ 1991 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1992 1993$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1994 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1995 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1996 $(call if_changed,gen_compile_commands) 1997 1998targets += $(extmod_prefix)compile_commands.json 1999 2000PHONY += clang-tidy clang-analyzer 2001 2002ifdef CONFIG_CC_IS_CLANG 2003quiet_cmd_clang_tools = CHECK $< 2004 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2005 2006clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2007 $(call cmd,clang_tools) 2008else 2009clang-tidy clang-analyzer: 2010 @echo "$@ requires CC=clang" >&2 2011 @false 2012endif 2013 2014# Scripts to check various things for consistency 2015# --------------------------------------------------------------------------- 2016 2017PHONY += includecheck versioncheck coccicheck export_report 2018 2019includecheck: 2020 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2021 -name '*.[hcS]' -type f -print | sort \ 2022 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2023 2024versioncheck: 2025 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2026 -name '*.[hcS]' -type f -print | sort \ 2027 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2028 2029coccicheck: 2030 $(Q)$(BASH) $(srctree)/scripts/$@ 2031 2032export_report: 2033 $(PERL) $(srctree)/scripts/export_report.pl 2034 2035PHONY += checkstack kernelrelease kernelversion image_name 2036 2037# UML needs a little special treatment here. It wants to use the host 2038# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2039# else wants $(ARCH), including people doing cross-builds, which means 2040# that $(SUBARCH) doesn't work here. 2041ifeq ($(ARCH), um) 2042CHECKSTACK_ARCH := $(SUBARCH) 2043else 2044CHECKSTACK_ARCH := $(ARCH) 2045endif 2046MINSTACKSIZE ?= 100 2047checkstack: 2048 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2049 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2050 2051kernelrelease: 2052 @$(filechk_kernel.release) 2053 2054kernelversion: 2055 @echo $(KERNELVERSION) 2056 2057image_name: 2058 @echo $(KBUILD_IMAGE) 2059 2060PHONY += run-command 2061run-command: 2062 $(Q)$(KBUILD_RUN_COMMAND) 2063 2064quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2065 cmd_rmfiles = rm -rf $(rm-files) 2066 2067# read saved command lines for existing targets 2068existing-targets := $(wildcard $(sort $(targets))) 2069 2070-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2071 2072endif # config-build 2073endif # mixed-build 2074endif # need-sub-make 2075 2076PHONY += FORCE 2077FORCE: 2078 2079# Declare the contents of the PHONY variable as phony. We keep that 2080# information in a variable so we can use it in if_changed and friends. 2081.PHONY: $(PHONY) 2082