1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 10 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 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 -Drust_2018_idioms \ 465 -Dunreachable_pub -Dnon_ascii_idents \ 466 -Wmissing_docs \ 467 -Drustdoc::missing_crate_level_docs \ 468 -Dclippy::correctness -Dclippy::style \ 469 -Dclippy::suspicious -Dclippy::complexity \ 470 -Dclippy::perf \ 471 -Dclippy::let_unit_value -Dclippy::mut_mut \ 472 -Dclippy::needless_bitwise_bool \ 473 -Dclippy::needless_continue \ 474 -Dclippy::no_mangle_with_rust_abi \ 475 -Wclippy::dbg_macro 476 477KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 478KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 479KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 480 -Zallow-features= $(HOSTRUSTFLAGS) 481KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 482KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 483 484# Make variables (CC, etc...) 485CPP = $(CC) -E 486ifneq ($(LLVM),) 487CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 488LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 489AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 490NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 491OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 492OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 493READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 494STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 495else 496CC = $(CROSS_COMPILE)gcc 497LD = $(CROSS_COMPILE)ld 498AR = $(CROSS_COMPILE)ar 499NM = $(CROSS_COMPILE)nm 500OBJCOPY = $(CROSS_COMPILE)objcopy 501OBJDUMP = $(CROSS_COMPILE)objdump 502READELF = $(CROSS_COMPILE)readelf 503STRIP = $(CROSS_COMPILE)strip 504endif 505RUSTC = rustc 506RUSTDOC = rustdoc 507RUSTFMT = rustfmt 508CLIPPY_DRIVER = clippy-driver 509BINDGEN = bindgen 510CARGO = cargo 511PAHOLE = pahole 512RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 513LEX = flex 514YACC = bison 515AWK = awk 516INSTALLKERNEL := installkernel 517PERL = perl 518PYTHON3 = python3 519CHECK = sparse 520BASH = bash 521KGZIP = gzip 522KBZIP2 = bzip2 523KLZOP = lzop 524LZMA = lzma 525LZ4 = lz4c 526XZ = xz 527ZSTD = zstd 528 529CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 530 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 531NOSTDINC_FLAGS := 532CFLAGS_MODULE = 533RUSTFLAGS_MODULE = 534AFLAGS_MODULE = 535LDFLAGS_MODULE = 536CFLAGS_KERNEL = 537RUSTFLAGS_KERNEL = 538AFLAGS_KERNEL = 539LDFLAGS_vmlinux = 540 541# Use USERINCLUDE when you must reference the UAPI directories only. 542USERINCLUDE := \ 543 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 544 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 545 -I$(srctree)/include/uapi \ 546 -I$(objtree)/include/generated/uapi \ 547 -include $(srctree)/include/linux/compiler-version.h \ 548 -include $(srctree)/include/linux/kconfig.h 549 550# Use LINUXINCLUDE when you must reference the include/ directory. 551# Needed to be compatible with the O= option 552LINUXINCLUDE := \ 553 -I$(srctree)/arch/$(SRCARCH)/include \ 554 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 555 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 556 -I$(objtree)/include \ 557 $(USERINCLUDE) 558 559KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 560 561KBUILD_CFLAGS := 562KBUILD_CFLAGS += -std=gnu11 563KBUILD_CFLAGS += -fshort-wchar 564KBUILD_CFLAGS += -funsigned-char 565KBUILD_CFLAGS += -fno-common 566KBUILD_CFLAGS += -fno-PIE 567KBUILD_CFLAGS += -fno-strict-aliasing 568 569KBUILD_CPPFLAGS := -D__KERNEL__ 570KBUILD_RUSTFLAGS := $(rust_common_flags) \ 571 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 572 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 573 -Csymbol-mangling-version=v0 \ 574 -Crelocation-model=static \ 575 -Zfunction-sections=n \ 576 -Dclippy::float_arithmetic 577 578KBUILD_AFLAGS_KERNEL := 579KBUILD_CFLAGS_KERNEL := 580KBUILD_RUSTFLAGS_KERNEL := 581KBUILD_AFLAGS_MODULE := -DMODULE 582KBUILD_CFLAGS_MODULE := -DMODULE 583KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 584KBUILD_LDFLAGS_MODULE := 585KBUILD_LDFLAGS := 586CLANG_FLAGS := 587 588ifeq ($(KBUILD_CLIPPY),1) 589 RUSTC_OR_CLIPPY_QUIET := CLIPPY 590 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 591else 592 RUSTC_OR_CLIPPY_QUIET := RUSTC 593 RUSTC_OR_CLIPPY = $(RUSTC) 594endif 595 596ifdef RUST_LIB_SRC 597 export RUST_LIB_SRC 598endif 599 600# Allows the usage of unstable features in stable compilers. 601export RUSTC_BOOTSTRAP := 1 602 603export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 604export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 605export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 606export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 607export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 608export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 609export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 610export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 611 612export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 613export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 614export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 615export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 616export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 617export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 618 619# Files to ignore in find ... statements 620 621export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 622 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 623 -prune -o 624 625# =========================================================================== 626# Rules shared between *config targets and build targets 627 628# Basic helpers built in scripts/basic/ 629PHONY += scripts_basic 630scripts_basic: 631 $(Q)$(MAKE) $(build)=scripts/basic 632 633PHONY += outputmakefile 634ifdef building_out_of_srctree 635# Before starting out-of-tree build, make sure the source tree is clean. 636# outputmakefile generates a Makefile in the output directory, if using a 637# separate output directory. This allows convenient use of make in the 638# output directory. 639# At the same time when output Makefile generated, generate .gitignore to 640# ignore whole output directory 641 642quiet_cmd_makefile = GEN Makefile 643 cmd_makefile = { \ 644 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 645 echo "include $(srctree)/Makefile"; \ 646 } > Makefile 647 648outputmakefile: 649 @if [ -f $(srctree)/.config -o \ 650 -d $(srctree)/include/config -o \ 651 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 652 echo >&2 "***"; \ 653 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 654 echo >&2 "*** in $(abs_srctree)";\ 655 echo >&2 "***"; \ 656 false; \ 657 fi 658 $(Q)ln -fsn $(srctree) source 659 $(call cmd,makefile) 660 $(Q)test -e .gitignore || \ 661 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 662endif 663 664# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 665# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 666# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 667# and from include/config/auto.conf.cmd to detect the compiler upgrade. 668CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 669 670ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 671include $(srctree)/scripts/Makefile.clang 672endif 673 674# Include this also for config targets because some architectures need 675# cc-cross-prefix to determine CROSS_COMPILE. 676ifdef need-compiler 677include $(srctree)/scripts/Makefile.compiler 678endif 679 680ifdef config-build 681# =========================================================================== 682# *config targets only - make sure prerequisites are updated, and descend 683# in scripts/kconfig to make the *config target 684 685# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 686# KBUILD_DEFCONFIG may point out an alternative default configuration 687# used for 'make defconfig' 688include $(srctree)/arch/$(SRCARCH)/Makefile 689export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 690 691config: outputmakefile scripts_basic FORCE 692 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 693 694%config: outputmakefile scripts_basic FORCE 695 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 696 697else #!config-build 698# =========================================================================== 699# Build targets only - this includes vmlinux, arch-specific targets, clean 700# targets and others. In general all targets except *config targets. 701 702# If building an external module we do not care about the all: rule 703# but instead __all depend on modules 704PHONY += all 705ifeq ($(KBUILD_EXTMOD),) 706__all: all 707else 708__all: modules 709endif 710 711targets := 712 713# Decide whether to build built-in, modular, or both. 714# Normally, just do built-in. 715 716KBUILD_MODULES := 717KBUILD_BUILTIN := 1 718 719# If we have only "make modules", don't compile built-in objects. 720ifeq ($(MAKECMDGOALS),modules) 721 KBUILD_BUILTIN := 722endif 723 724# If we have "make <whatever> modules", compile modules 725# in addition to whatever we do anyway. 726# Just "make" or "make all" shall build modules as well 727 728ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 729 KBUILD_MODULES := 1 730endif 731 732ifeq ($(MAKECMDGOALS),) 733 KBUILD_MODULES := 1 734endif 735 736export KBUILD_MODULES KBUILD_BUILTIN 737 738ifdef need-config 739include include/config/auto.conf 740endif 741 742ifeq ($(KBUILD_EXTMOD),) 743# Objects we will link into vmlinux / subdirs we need to visit 744core-y := 745drivers-y := 746libs-y := lib/ 747endif # KBUILD_EXTMOD 748 749# The all: target is the default when no target is given on the 750# command line. 751# This allow a user to issue only 'make' to build a kernel including modules 752# Defaults to vmlinux, but the arch makefile usually adds further targets 753all: vmlinux 754 755CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 756ifdef CONFIG_CC_IS_GCC 757CFLAGS_GCOV += -fno-tree-loop-im 758endif 759export CFLAGS_GCOV 760 761# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 762ifdef CONFIG_FUNCTION_TRACER 763 CC_FLAGS_FTRACE := -pg 764endif 765 766include $(srctree)/arch/$(SRCARCH)/Makefile 767 768ifdef need-config 769ifdef may-sync-config 770# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 771# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 772# because some architectures define CROSS_COMPILE there. 773include include/config/auto.conf.cmd 774 775$(KCONFIG_CONFIG): 776 @echo >&2 '***' 777 @echo >&2 '*** Configuration file "$@" not found!' 778 @echo >&2 '***' 779 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 780 @echo >&2 '*** "make menuconfig" or "make xconfig").' 781 @echo >&2 '***' 782 @/bin/false 783 784# The actual configuration files used during the build are stored in 785# include/generated/ and include/config/. Update them if .config is newer than 786# include/config/auto.conf (which mirrors .config). 787# 788# This exploits the 'multi-target pattern rule' trick. 789# The syncconfig should be executed only once to make all the targets. 790# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 791# 792# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 793# so you cannot notice that Kconfig is waiting for the user input. 794%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 795 $(Q)$(kecho) " SYNC $@" 796 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 797else # !may-sync-config 798# External modules and some install targets need include/generated/autoconf.h 799# and include/config/auto.conf but do not care if they are up-to-date. 800# Use auto.conf to trigger the test 801PHONY += include/config/auto.conf 802 803include/config/auto.conf: 804 @test -e include/generated/autoconf.h -a -e $@ || ( \ 805 echo >&2; \ 806 echo >&2 " ERROR: Kernel configuration is invalid."; \ 807 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 808 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 809 echo >&2 ; \ 810 /bin/false) 811 812endif # may-sync-config 813endif # need-config 814 815KBUILD_CFLAGS += -fno-delete-null-pointer-checks 816 817ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 818KBUILD_CFLAGS += -O2 819KBUILD_RUSTFLAGS += -Copt-level=2 820else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 821KBUILD_CFLAGS += -Os 822KBUILD_RUSTFLAGS += -Copt-level=s 823endif 824 825# Always set `debug-assertions` and `overflow-checks` because their default 826# depends on `opt-level` and `debug-assertions`, respectively. 827KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 828KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 829 830# Tell gcc to never replace conditional load with a non-conditional one 831ifdef CONFIG_CC_IS_GCC 832# gcc-10 renamed --param=allow-store-data-races=0 to 833# -fno-allow-store-data-races. 834KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 835KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 836endif 837 838ifdef CONFIG_READABLE_ASM 839# Disable optimizations that make assembler listings hard to read. 840# reorder blocks reorders the control in the function 841# ipa clone creates specialized cloned functions 842# partial inlining inlines only parts of functions 843KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 844endif 845 846stackp-flags-y := -fno-stack-protector 847stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 848stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 849 850KBUILD_CFLAGS += $(stackp-flags-y) 851 852KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 853KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 854 855ifdef CONFIG_FRAME_POINTER 856KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 857KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 858else 859# Some targets (ARM with Thumb2, for example), can't be built with frame 860# pointers. For those, we don't have FUNCTION_TRACER automatically 861# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 862# incompatible with -fomit-frame-pointer with current GCC, so we don't use 863# -fomit-frame-pointer with FUNCTION_TRACER. 864# In the Rust target specification, "frame-pointer" is set explicitly 865# to "may-omit". 866ifndef CONFIG_FUNCTION_TRACER 867KBUILD_CFLAGS += -fomit-frame-pointer 868endif 869endif 870 871# Initialize all stack variables with a 0xAA pattern. 872ifdef CONFIG_INIT_STACK_ALL_PATTERN 873KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 874endif 875 876# Initialize all stack variables with a zero value. 877ifdef CONFIG_INIT_STACK_ALL_ZERO 878KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 879ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 880# https://github.com/llvm/llvm-project/issues/44842 881CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 882export CC_AUTO_VAR_INIT_ZERO_ENABLER 883KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 884endif 885endif 886 887# While VLAs have been removed, GCC produces unreachable stack probes 888# for the randomize_kstack_offset feature. Disable it for all compilers. 889KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 890 891# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 892ifdef CONFIG_ZERO_CALL_USED_REGS 893KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 894endif 895 896ifdef CONFIG_FUNCTION_TRACER 897ifdef CONFIG_FTRACE_MCOUNT_USE_CC 898 CC_FLAGS_FTRACE += -mrecord-mcount 899 ifdef CONFIG_HAVE_NOP_MCOUNT 900 ifeq ($(call cc-option-yn, -mnop-mcount),y) 901 CC_FLAGS_FTRACE += -mnop-mcount 902 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 903 endif 904 endif 905endif 906ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 907 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 908 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 909 endif 910endif 911ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 912 ifdef CONFIG_HAVE_C_RECORDMCOUNT 913 BUILD_C_RECORDMCOUNT := y 914 export BUILD_C_RECORDMCOUNT 915 endif 916endif 917ifdef CONFIG_HAVE_FENTRY 918 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 919 ifeq ($(call cc-option-yn, -mfentry),y) 920 CC_FLAGS_FTRACE += -mfentry 921 CC_FLAGS_USING += -DCC_USING_FENTRY 922 endif 923endif 924export CC_FLAGS_FTRACE 925KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 926KBUILD_AFLAGS += $(CC_FLAGS_USING) 927endif 928 929# We trigger additional mismatches with less inlining 930ifdef CONFIG_DEBUG_SECTION_MISMATCH 931KBUILD_CFLAGS += -fno-inline-functions-called-once 932endif 933 934# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 935ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 936KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 937KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 938LDFLAGS_vmlinux += --gc-sections 939endif 940 941ifdef CONFIG_SHADOW_CALL_STACK 942ifndef CONFIG_DYNAMIC_SCS 943CC_FLAGS_SCS := -fsanitize=shadow-call-stack 944KBUILD_CFLAGS += $(CC_FLAGS_SCS) 945endif 946export CC_FLAGS_SCS 947endif 948 949ifdef CONFIG_LTO_CLANG 950ifdef CONFIG_LTO_CLANG_THIN 951CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 952else 953CC_FLAGS_LTO := -flto 954endif 955CC_FLAGS_LTO += -fvisibility=hidden 956 957# Limit inlining across translation units to reduce binary size 958KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 959endif 960 961ifdef CONFIG_LTO 962KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 963KBUILD_AFLAGS += -fno-lto 964export CC_FLAGS_LTO 965endif 966 967ifdef CONFIG_CFI_CLANG 968CC_FLAGS_CFI := -fsanitize=kcfi 969KBUILD_CFLAGS += $(CC_FLAGS_CFI) 970export CC_FLAGS_CFI 971endif 972 973# Architectures can define flags to add/remove for floating-point support 974CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 975export CC_FLAGS_FPU 976export CC_FLAGS_NO_FPU 977 978ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 979# Set the minimal function alignment. Use the newer GCC option 980# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 981# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 982ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 983KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 984else 985KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 986endif 987endif 988 989# arch Makefile may override CC so keep this after arch Makefile is included 990NOSTDINC_FLAGS += -nostdinc 991 992# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 993# the kernel uses only C99 flexible arrays for dynamically sized trailing 994# arrays. Enforce this for everything that may examine structure sizes and 995# perform bounds checking. 996KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 997 998#Currently, disable -Wstringop-overflow for GCC 11, globally. 999KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1000KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1001 1002# disable invalid "can't wrap" optimizations for signed / pointers 1003KBUILD_CFLAGS += -fno-strict-overflow 1004 1005# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1006KBUILD_CFLAGS += -fno-stack-check 1007 1008# conserve stack if available 1009ifdef CONFIG_CC_IS_GCC 1010KBUILD_CFLAGS += -fconserve-stack 1011endif 1012 1013# change __FILE__ to the relative path from the srctree 1014KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1015 1016# include additional Makefiles when needed 1017include-y := scripts/Makefile.extrawarn 1018include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1019include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1020include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1021include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1022include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1023include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1024include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1025include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1026include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1027 1028include $(addprefix $(srctree)/, $(include-y)) 1029 1030# scripts/Makefile.gcc-plugins is intentionally included last. 1031# Do not add $(call cc-option,...) below this line. When you build the kernel 1032# from the clean source tree, the GCC plugins do not exist at this point. 1033 1034# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1035KBUILD_CPPFLAGS += $(KCPPFLAGS) 1036KBUILD_AFLAGS += $(KAFLAGS) 1037KBUILD_CFLAGS += $(KCFLAGS) 1038KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1039 1040KBUILD_LDFLAGS_MODULE += --build-id=sha1 1041LDFLAGS_vmlinux += --build-id=sha1 1042 1043KBUILD_LDFLAGS += -z noexecstack 1044ifeq ($(CONFIG_LD_IS_BFD),y) 1045KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1046endif 1047 1048ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1049LDFLAGS_vmlinux += -X 1050endif 1051 1052ifeq ($(CONFIG_RELR),y) 1053# ld.lld before 15 did not support -z pack-relative-relocs. 1054LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1055endif 1056 1057# We never want expected sections to be placed heuristically by the 1058# linker. All sections should be explicitly named in the linker script. 1059ifdef CONFIG_LD_ORPHAN_WARN 1060LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1061endif 1062 1063# Align the bit size of userspace programs with the kernel 1064KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1065KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1066 1067# make the checker run with the right architecture 1068CHECKFLAGS += --arch=$(ARCH) 1069 1070# insure the checker run with the right endianness 1071CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1072 1073# the checker needs the correct machine size 1074CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1075 1076# Default kernel image to build when no specific target is given. 1077# KBUILD_IMAGE may be overruled on the command line or 1078# set in the environment 1079# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1080# this default value 1081export KBUILD_IMAGE ?= vmlinux 1082 1083# 1084# INSTALL_PATH specifies where to place the updated kernel and system map 1085# images. Default is /boot, but you can set it to other values 1086export INSTALL_PATH ?= /boot 1087 1088# 1089# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1090# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1091# an argument if needed. Otherwise it defaults to the kernel install path 1092# 1093export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1094 1095# 1096# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1097# relocations required by build roots. This is not defined in the 1098# makefile but the argument can be passed to make if needed. 1099# 1100 1101MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1102export MODLIB 1103 1104PHONY += prepare0 1105 1106export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1107export MODORDER := $(extmod_prefix)modules.order 1108export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1109 1110ifeq ($(KBUILD_EXTMOD),) 1111 1112build-dir := . 1113clean-dirs := $(sort . Documentation \ 1114 $(patsubst %/,%,$(filter %/, $(core-) \ 1115 $(drivers-) $(libs-)))) 1116 1117export ARCH_CORE := $(core-y) 1118export ARCH_LIB := $(filter %/, $(libs-y)) 1119export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1120# Externally visible symbols (used by link-vmlinux.sh) 1121 1122KBUILD_VMLINUX_OBJS := ./built-in.a 1123ifdef CONFIG_MODULES 1124KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1125KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1126else 1127KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1128endif 1129 1130export KBUILD_VMLINUX_LIBS 1131export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1132 1133ifdef CONFIG_TRIM_UNUSED_KSYMS 1134# For the kernel to actually contain only the needed exported symbols, 1135# we have to build modules as well to determine what those symbols are. 1136KBUILD_MODULES := 1 1137endif 1138 1139# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1140quiet_cmd_ar_vmlinux.a = AR $@ 1141 cmd_ar_vmlinux.a = \ 1142 rm -f $@; \ 1143 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1144 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1145 1146targets += vmlinux.a 1147vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1148 $(call if_changed,ar_vmlinux.a) 1149 1150PHONY += vmlinux_o 1151vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1152 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1153 1154vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1155 @: 1156 1157PHONY += vmlinux 1158# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1159# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1160# unrelated; the decompressors just happen to have the same base name, 1161# arch/*/boot/compressed/vmlinux. 1162# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1163# 1164# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1165# https://savannah.gnu.org/bugs/?61463 1166# For Make > 4.4, the following simple code will work: 1167# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1168vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1169vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1170vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1172 1173# The actual objects are generated when descending, 1174# make sure no implicit rule kicks in 1175$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1176 1177ifeq ($(origin KERNELRELEASE),file) 1178filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1179else 1180filechk_kernel.release = echo $(KERNELRELEASE) 1181endif 1182 1183# Store (new) KERNELRELEASE string in include/config/kernel.release 1184include/config/kernel.release: FORCE 1185 $(call filechk,kernel.release) 1186 1187# Additional helpers built in scripts/ 1188# Carefully list dependencies so we do not try to build scripts twice 1189# in parallel 1190PHONY += scripts 1191scripts: scripts_basic scripts_dtc 1192 $(Q)$(MAKE) $(build)=$(@) 1193 1194# Things we need to do before we recursively start building the kernel 1195# or the modules are listed in "prepare". 1196# A multi level approach is used. prepareN is processed before prepareN-1. 1197# archprepare is used in arch Makefiles and when processed asm symlink, 1198# version.h and scripts_basic is processed / created. 1199 1200PHONY += prepare archprepare 1201 1202archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1203 asm-generic $(version_h) include/generated/utsrelease.h \ 1204 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1205 1206prepare0: archprepare 1207 $(Q)$(MAKE) $(build)=scripts/mod 1208 $(Q)$(MAKE) $(build)=. prepare 1209 1210# All the preparing.. 1211prepare: prepare0 1212ifdef CONFIG_RUST 1213 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1214 $(Q)$(MAKE) $(build)=rust 1215endif 1216 1217PHONY += remove-stale-files 1218remove-stale-files: 1219 $(Q)$(srctree)/scripts/remove-stale-files 1220 1221# Support for using generic headers in asm-generic 1222asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1223 1224PHONY += asm-generic uapi-asm-generic 1225asm-generic: uapi-asm-generic 1226 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1227 generic=include/asm-generic 1228uapi-asm-generic: 1229 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1230 generic=include/uapi/asm-generic 1231 1232# Generate some files 1233# --------------------------------------------------------------------------- 1234 1235# KERNELRELEASE can change from a few different places, meaning version.h 1236# needs to be updated, so this check is forced on all builds 1237 1238uts_len := 64 1239define filechk_utsrelease.h 1240 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1241 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1242 exit 1; \ 1243 fi; \ 1244 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1245endef 1246 1247define filechk_version.h 1248 if [ $(SUBLEVEL) -gt 255 ]; then \ 1249 echo \#define LINUX_VERSION_CODE $(shell \ 1250 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1251 else \ 1252 echo \#define LINUX_VERSION_CODE $(shell \ 1253 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1254 fi; \ 1255 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1256 ((c) > 255 ? 255 : (c)))'; \ 1257 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1258 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1259 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1260endef 1261 1262$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1263$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1264$(version_h): FORCE 1265 $(call filechk,version.h) 1266 1267include/generated/utsrelease.h: include/config/kernel.release FORCE 1268 $(call filechk,utsrelease.h) 1269 1270filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1271 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1272 1273include/generated/compile.h: FORCE 1274 $(call filechk,compile.h) 1275 1276PHONY += headerdep 1277headerdep: 1278 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1279 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1280 1281# --------------------------------------------------------------------------- 1282# Kernel headers 1283 1284#Default location for installed headers 1285export INSTALL_HDR_PATH = $(objtree)/usr 1286 1287quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1288 cmd_headers_install = \ 1289 mkdir -p $(INSTALL_HDR_PATH); \ 1290 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1291 usr/include $(INSTALL_HDR_PATH) 1292 1293PHONY += headers_install 1294headers_install: headers 1295 $(call cmd,headers_install) 1296 1297PHONY += archheaders archscripts 1298 1299hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1300 1301PHONY += headers 1302headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1303 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1304 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1305 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1306 1307ifdef CONFIG_HEADERS_INSTALL 1308prepare: headers 1309endif 1310 1311PHONY += scripts_unifdef 1312scripts_unifdef: scripts_basic 1313 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1314 1315# --------------------------------------------------------------------------- 1316# Install 1317 1318# Many distributions have the custom install script, /sbin/installkernel. 1319# If DKMS is installed, 'make install' will eventually recurse back 1320# to this Makefile to build and install external modules. 1321# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1322 1323quiet_cmd_install = INSTALL $(INSTALL_PATH) 1324 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1325 1326# --------------------------------------------------------------------------- 1327# vDSO install 1328 1329PHONY += vdso_install 1330vdso_install: export INSTALL_FILES = $(vdso-install-y) 1331vdso_install: 1332 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1333 1334# --------------------------------------------------------------------------- 1335# Tools 1336 1337ifdef CONFIG_OBJTOOL 1338prepare: tools/objtool 1339endif 1340 1341ifdef CONFIG_BPF 1342ifdef CONFIG_DEBUG_INFO_BTF 1343prepare: tools/bpf/resolve_btfids 1344endif 1345endif 1346 1347PHONY += resolve_btfids_clean 1348 1349resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1350 1351# tools/bpf/resolve_btfids directory might not exist 1352# in output directory, skip its clean in that case 1353resolve_btfids_clean: 1354ifneq ($(wildcard $(resolve_btfids_O)),) 1355 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1356endif 1357 1358# Clear a bunch of variables before executing the submake 1359ifeq ($(quiet),silent_) 1360tools_silent=s 1361endif 1362 1363tools/: FORCE 1364 $(Q)mkdir -p $(objtree)/tools 1365 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1366 1367tools/%: FORCE 1368 $(Q)mkdir -p $(objtree)/tools 1369 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1370 1371# --------------------------------------------------------------------------- 1372# Kernel selftest 1373 1374PHONY += kselftest 1375kselftest: headers 1376 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1377 1378kselftest-%: headers FORCE 1379 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1380 1381PHONY += kselftest-merge 1382kselftest-merge: 1383 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1384 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1385 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1386 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1387 1388# --------------------------------------------------------------------------- 1389# Devicetree files 1390 1391ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1392dtstree := arch/$(SRCARCH)/boot/dts 1393endif 1394 1395ifneq ($(dtstree),) 1396 1397%.dtb: dtbs_prepare 1398 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1399 1400%.dtbo: dtbs_prepare 1401 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1402 1403PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1404dtbs: dtbs_prepare 1405 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1406 1407# include/config/kernel.release is actually needed when installing DTBs because 1408# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1409# dtbs_install depend on it as dtbs_install may run as root. 1410dtbs_prepare: include/config/kernel.release scripts_dtc 1411 1412ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1413export CHECK_DTBS=y 1414endif 1415 1416ifneq ($(CHECK_DTBS),) 1417dtbs_prepare: dt_binding_schemas 1418endif 1419 1420dtbs_check: dtbs 1421 1422dtbs_install: 1423 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1424 1425ifdef CONFIG_OF_EARLY_FLATTREE 1426all: dtbs 1427endif 1428 1429endif 1430 1431PHONY += scripts_dtc 1432scripts_dtc: scripts_basic 1433 $(Q)$(MAKE) $(build)=scripts/dtc 1434 1435ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1436export CHECK_DTBS=y 1437endif 1438 1439PHONY += dt_binding_check dt_binding_schemas 1440dt_binding_check: dt_binding_schemas scripts_dtc 1441 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1442 1443dt_binding_schemas: 1444 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1445 1446PHONY += dt_compatible_check 1447dt_compatible_check: dt_binding_schemas 1448 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1449 1450# --------------------------------------------------------------------------- 1451# Modules 1452 1453ifdef CONFIG_MODULES 1454 1455# By default, build modules as well 1456 1457all: modules 1458 1459# When we're building modules with modversions, we need to consider 1460# the built-in objects during the descend as well, in order to 1461# make sure the checksums are up to date before we record them. 1462ifdef CONFIG_MODVERSIONS 1463 KBUILD_BUILTIN := 1 1464endif 1465 1466# Build modules 1467# 1468 1469# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1470# is an exception. 1471ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1472KBUILD_BUILTIN := 1 1473modules: vmlinux 1474endif 1475 1476modules: modules_prepare 1477 1478# Target to prepare building external modules 1479modules_prepare: prepare 1480 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1481 1482endif # CONFIG_MODULES 1483 1484### 1485# Cleaning is done on three levels. 1486# make clean Delete most generated files 1487# Leave enough to build external modules 1488# make mrproper Delete the current configuration, and all generated files 1489# make distclean Remove editor backup files, patch leftover files and the like 1490 1491# Directories & files removed with 'make clean' 1492CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1493 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1494 compile_commands.json rust/test \ 1495 rust-project.json .vmlinux.objs .vmlinux.export.c 1496 1497# Directories & files removed with 'make mrproper' 1498MRPROPER_FILES += include/config include/generated \ 1499 arch/$(SRCARCH)/include/generated .objdiff \ 1500 debian snap tar-install \ 1501 .config .config.old .version \ 1502 Module.symvers \ 1503 certs/signing_key.pem \ 1504 certs/x509.genkey \ 1505 vmlinux-gdb.py \ 1506 rpmbuild \ 1507 rust/libmacros.so 1508 1509# clean - Delete most, but leave enough to build external modules 1510# 1511clean: private rm-files := $(CLEAN_FILES) 1512 1513PHONY += archclean vmlinuxclean 1514 1515vmlinuxclean: 1516 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1517 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1518 1519clean: archclean vmlinuxclean resolve_btfids_clean 1520 1521# mrproper - Delete all generated files, including .config 1522# 1523mrproper: private rm-files := $(MRPROPER_FILES) 1524mrproper-dirs := $(addprefix _mrproper_,scripts) 1525 1526PHONY += $(mrproper-dirs) mrproper 1527$(mrproper-dirs): 1528 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1529 1530mrproper: clean $(mrproper-dirs) 1531 $(call cmd,rmfiles) 1532 @find . $(RCS_FIND_IGNORE) \ 1533 \( -name '*.rmeta' \) \ 1534 -type f -print | xargs rm -f 1535 1536# distclean 1537# 1538PHONY += distclean 1539 1540distclean: mrproper 1541 @find . $(RCS_FIND_IGNORE) \ 1542 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1543 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1544 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1545 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1546 -type f -print | xargs rm -f 1547 1548 1549# Packaging of the kernel to various formats 1550# --------------------------------------------------------------------------- 1551 1552%src-pkg: FORCE 1553 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1554%pkg: include/config/kernel.release FORCE 1555 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1556 1557# Brief documentation of the typical targets used 1558# --------------------------------------------------------------------------- 1559 1560boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1561boards := $(sort $(notdir $(boards))) 1562board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1563board-dirs := $(sort $(notdir $(board-dirs:/=))) 1564 1565PHONY += help 1566help: 1567 @echo 'Cleaning targets:' 1568 @echo ' clean - Remove most generated files but keep the config and' 1569 @echo ' enough build support to build external modules' 1570 @echo ' mrproper - Remove all generated files + config + various backup files' 1571 @echo ' distclean - mrproper + remove editor backup and patch files' 1572 @echo '' 1573 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1574 @echo '' 1575 @echo 'Other generic targets:' 1576 @echo ' all - Build all targets marked with [*]' 1577 @echo '* vmlinux - Build the bare kernel' 1578 @echo '* modules - Build all modules' 1579 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1580 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1581 @echo ' dir/ - Build all files in dir and below' 1582 @echo ' dir/file.[ois] - Build specified target only' 1583 @echo ' dir/file.ll - Build the LLVM assembly file' 1584 @echo ' (requires compiler support for LLVM assembly generation)' 1585 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1586 @echo ' (requires a recent binutils and recent build (System.map))' 1587 @echo ' dir/file.ko - Build module including final link' 1588 @echo ' modules_prepare - Set up for building external modules' 1589 @echo ' tags/TAGS - Generate tags file for editors' 1590 @echo ' cscope - Generate cscope index' 1591 @echo ' gtags - Generate GNU GLOBAL index' 1592 @echo ' kernelrelease - Output the release version string (use with make -s)' 1593 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1594 @echo ' image_name - Output the image name (use with make -s)' 1595 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1596 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1597 echo '' 1598 @echo 'Static analysers:' 1599 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1600 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1601 @echo ' versioncheck - Sanity check on version.h usage' 1602 @echo ' includecheck - Check for duplicate included header files' 1603 @echo ' export_report - List the usages of all exported symbols' 1604 @echo ' headerdep - Detect inclusion cycles in headers' 1605 @echo ' coccicheck - Check with Coccinelle' 1606 @echo ' clang-analyzer - Check with clang static analyzer' 1607 @echo ' clang-tidy - Check with clang-tidy' 1608 @echo '' 1609 @echo 'Tools:' 1610 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1611 @echo '' 1612 @echo 'Kernel selftest:' 1613 @echo ' kselftest - Build and run kernel selftest' 1614 @echo ' Build, install, and boot kernel before' 1615 @echo ' running kselftest on it' 1616 @echo ' Run as root for full coverage' 1617 @echo ' kselftest-all - Build kernel selftest' 1618 @echo ' kselftest-install - Build and install kernel selftest' 1619 @echo ' kselftest-clean - Remove all generated kselftest files' 1620 @echo ' kselftest-merge - Merge all the config dependencies of' 1621 @echo ' kselftest to existing .config.' 1622 @echo '' 1623 @echo 'Rust targets:' 1624 @echo ' rustavailable - Checks whether the Rust toolchain is' 1625 @echo ' available and, if not, explains why.' 1626 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1627 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1628 @echo ' is formatted, printing a diff otherwise.' 1629 @echo ' rustdoc - Generate Rust documentation' 1630 @echo ' (requires kernel .config)' 1631 @echo ' rusttest - Runs the Rust tests' 1632 @echo ' (requires kernel .config; downloads external repos)' 1633 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1634 @echo ' (requires kernel .config)' 1635 @echo ' dir/file.[os] - Build specified target only' 1636 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1637 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1638 @echo ' The output is not intended to be compilable.' 1639 @echo ' dir/file.ll - Build the LLVM assembly file' 1640 @echo '' 1641 @$(if $(dtstree), \ 1642 echo 'Devicetree:'; \ 1643 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1644 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1645 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1646 echo ' dt_binding_schema - Build processed device tree binding schemas'; \ 1647 echo ' dtbs_check - Validate device tree source files';\ 1648 echo '') 1649 1650 @echo 'Userspace tools targets:' 1651 @echo ' use "make tools/help"' 1652 @echo ' or "cd tools; make help"' 1653 @echo '' 1654 @echo 'Kernel packaging:' 1655 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1656 @echo '' 1657 @echo 'Documentation targets:' 1658 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1659 @echo '' 1660 @echo 'Architecture-specific targets ($(SRCARCH)):' 1661 @$(or $(archhelp),\ 1662 echo ' No architecture-specific help defined for $(SRCARCH)') 1663 @echo '' 1664 @$(if $(boards), \ 1665 $(foreach b, $(boards), \ 1666 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1667 echo '') 1668 @$(if $(board-dirs), \ 1669 $(foreach b, $(board-dirs), \ 1670 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1671 printf " %-16s - Show all of the above\\n" help-boards; \ 1672 echo '') 1673 1674 @echo ' make V=n [targets] 1: verbose build' 1675 @echo ' 2: give reason for rebuild of target' 1676 @echo ' V=1 and V=2 can be combined with V=12' 1677 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1678 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1679 @echo ' (sparse by default)' 1680 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1681 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1682 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1683 @echo ' 1: warnings which may be relevant and do not occur too often' 1684 @echo ' 2: warnings which occur quite often but may still be relevant' 1685 @echo ' 3: more obscure warnings, can most likely be ignored' 1686 @echo ' c: extra checks in the configuration stage (Kconfig)' 1687 @echo ' e: warnings are being treated as errors' 1688 @echo ' Multiple levels can be combined with W=12 or W=123' 1689 @$(if $(dtstree), \ 1690 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1691 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1692 ) 1693 @echo '' 1694 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1695 @echo 'For further info see the ./README file' 1696 1697 1698help-board-dirs := $(addprefix help-,$(board-dirs)) 1699 1700help-boards: $(help-board-dirs) 1701 1702boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1703 1704$(help-board-dirs): help-%: 1705 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1706 @$(if $(boards-per-dir), \ 1707 $(foreach b, $(boards-per-dir), \ 1708 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1709 echo '') 1710 1711 1712# Documentation targets 1713# --------------------------------------------------------------------------- 1714DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1715 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1716PHONY += $(DOC_TARGETS) 1717$(DOC_TARGETS): 1718 $(Q)$(MAKE) $(build)=Documentation $@ 1719 1720 1721# Rust targets 1722# --------------------------------------------------------------------------- 1723 1724# "Is Rust available?" target 1725PHONY += rustavailable 1726rustavailable: 1727 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1728 1729# Documentation target 1730# 1731# Using the singular to avoid running afoul of `no-dot-config-targets`. 1732PHONY += rustdoc 1733rustdoc: prepare 1734 $(Q)$(MAKE) $(build)=rust $@ 1735 1736# Testing target 1737PHONY += rusttest 1738rusttest: prepare 1739 $(Q)$(MAKE) $(build)=rust $@ 1740 1741# Formatting targets 1742PHONY += rustfmt rustfmtcheck 1743 1744# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1745# 1746# We match using absolute paths since `find` does not resolve them 1747# when matching, which is a problem when e.g. `srctree` is `..`. 1748# We `grep` afterwards in order to remove the directory entry itself. 1749rustfmt: 1750 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1751 -o -path $(abs_srctree)/rust/alloc -prune \ 1752 -o -path $(abs_objtree)/rust/test -prune \ 1753 | grep -Fv $(abs_srctree)/rust/alloc \ 1754 | grep -Fv $(abs_objtree)/rust/test \ 1755 | grep -Fv generated \ 1756 | xargs $(RUSTFMT) $(rustfmt_flags) 1757 1758rustfmtcheck: rustfmt_flags = --check 1759rustfmtcheck: rustfmt 1760 1761# Misc 1762# --------------------------------------------------------------------------- 1763 1764PHONY += misc-check 1765misc-check: 1766 $(Q)$(srctree)/scripts/misc-check 1767 1768all: misc-check 1769 1770PHONY += scripts_gdb 1771scripts_gdb: prepare0 1772 $(Q)$(MAKE) $(build)=scripts/gdb 1773 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1774 1775ifdef CONFIG_GDB_SCRIPTS 1776all: scripts_gdb 1777endif 1778 1779else # KBUILD_EXTMOD 1780 1781filechk_kernel.release = echo $(KERNELRELEASE) 1782 1783### 1784# External module support. 1785# When building external modules the kernel used as basis is considered 1786# read-only, and no consistency checks are made and the make 1787# system is not used on the basis kernel. If updates are required 1788# in the basis kernel ordinary make commands (without M=...) must be used. 1789 1790# We are always building only modules. 1791KBUILD_BUILTIN := 1792KBUILD_MODULES := 1 1793 1794build-dir := $(KBUILD_EXTMOD) 1795 1796compile_commands.json: $(extmod_prefix)compile_commands.json 1797PHONY += compile_commands.json 1798 1799clean-dirs := $(KBUILD_EXTMOD) 1800clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1801 $(KBUILD_EXTMOD)/compile_commands.json 1802 1803PHONY += prepare 1804# now expand this into a simple variable to reduce the cost of shell evaluations 1805prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1806prepare: 1807 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1808 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1809 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1810 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1811 fi 1812 1813PHONY += help 1814help: 1815 @echo ' Building external modules.' 1816 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1817 @echo '' 1818 @echo ' modules - default target, build the module(s)' 1819 @echo ' modules_install - install the module' 1820 @echo ' clean - remove generated files in module directory only' 1821 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1822 @echo '' 1823 1824ifndef CONFIG_MODULES 1825modules modules_install: __external_modules_error 1826__external_modules_error: 1827 @echo >&2 '***' 1828 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1829 @echo >&2 '*** You cannot build or install external modules.' 1830 @echo >&2 '***' 1831 @false 1832endif 1833 1834endif # KBUILD_EXTMOD 1835 1836# --------------------------------------------------------------------------- 1837# Modules 1838 1839PHONY += modules modules_install modules_sign modules_prepare 1840 1841modules_install: 1842 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1843 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1844 1845ifeq ($(CONFIG_MODULE_SIG),y) 1846# modules_sign is a subset of modules_install. 1847# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1848modules_sign: modules_install 1849 @: 1850else 1851modules_sign: 1852 @echo >&2 '***' 1853 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1854 @echo >&2 '***' 1855 @false 1856endif 1857 1858ifdef CONFIG_MODULES 1859 1860$(MODORDER): $(build-dir) 1861 @: 1862 1863# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1864# This is solely useful to speed up test compiles. 1865modules: modpost 1866ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1867 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1868endif 1869 1870PHONY += modules_check 1871modules_check: $(MODORDER) 1872 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1873 1874else # CONFIG_MODULES 1875 1876modules: 1877 @: 1878 1879KBUILD_MODULES := 1880 1881endif # CONFIG_MODULES 1882 1883PHONY += modpost 1884modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1885 $(if $(KBUILD_MODULES), modules_check) 1886 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1887 1888# Single targets 1889# --------------------------------------------------------------------------- 1890# To build individual files in subdirectories, you can do like this: 1891# 1892# make foo/bar/baz.s 1893# 1894# The supported suffixes for single-target are listed in 'single-targets' 1895# 1896# To build only under specific subdirectories, you can do like this: 1897# 1898# make foo/bar/baz/ 1899 1900ifdef single-build 1901 1902# .ko is special because modpost is needed 1903single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1904single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1905 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1906 1907$(single-ko): single_modules 1908 @: 1909$(single-no-ko): $(build-dir) 1910 @: 1911 1912# Remove MODORDER when done because it is not the real one. 1913PHONY += single_modules 1914single_modules: $(single-no-ko) modules_prepare 1915 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1916 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1917ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1918 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1919endif 1920 $(Q)rm -f $(MODORDER) 1921 1922single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1923 1924KBUILD_MODULES := 1 1925 1926endif 1927 1928# Preset locale variables to speed up the build process. Limit locale 1929# tweaks to this spot to avoid wrong language settings when running 1930# make menuconfig etc. 1931# Error messages still appears in the original language 1932PHONY += $(build-dir) 1933$(build-dir): prepare 1934 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1935 1936clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1937PHONY += $(clean-dirs) clean 1938$(clean-dirs): 1939 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1940 1941clean: $(clean-dirs) 1942 $(call cmd,rmfiles) 1943 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1944 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1945 -o -name '*.ko.*' \ 1946 -o -name '*.dtb' -o -name '*.dtbo' \ 1947 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1948 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1949 -o -name '*.dwo' -o -name '*.lst' \ 1950 -o -name '*.su' -o -name '*.mod' \ 1951 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1952 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1953 -o -name '*.asn1.[ch]' \ 1954 -o -name '*.symtypes' -o -name 'modules.order' \ 1955 -o -name '*.c.[012]*.*' \ 1956 -o -name '*.ll' \ 1957 -o -name '*.gcno' \ 1958 -o -name '*.*.symversions' \) -type f -print \ 1959 -o -name '.tmp_*' -print \ 1960 | xargs rm -rf 1961 1962# Generate tags for editors 1963# --------------------------------------------------------------------------- 1964quiet_cmd_tags = GEN $@ 1965 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1966 1967tags TAGS cscope gtags: FORCE 1968 $(call cmd,tags) 1969 1970# IDE support targets 1971PHONY += rust-analyzer 1972rust-analyzer: 1973 $(Q)$(MAKE) $(build)=rust $@ 1974 1975# Script to generate missing namespace dependencies 1976# --------------------------------------------------------------------------- 1977 1978PHONY += nsdeps 1979nsdeps: export KBUILD_NSDEPS=1 1980nsdeps: modules 1981 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1982 1983# Clang Tooling 1984# --------------------------------------------------------------------------- 1985 1986quiet_cmd_gen_compile_commands = GEN $@ 1987 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1988 1989$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1990 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1991 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1992 $(call if_changed,gen_compile_commands) 1993 1994targets += $(extmod_prefix)compile_commands.json 1995 1996PHONY += clang-tidy clang-analyzer 1997 1998ifdef CONFIG_CC_IS_CLANG 1999quiet_cmd_clang_tools = CHECK $< 2000 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2001 2002clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2003 $(call cmd,clang_tools) 2004else 2005clang-tidy clang-analyzer: 2006 @echo "$@ requires CC=clang" >&2 2007 @false 2008endif 2009 2010# Scripts to check various things for consistency 2011# --------------------------------------------------------------------------- 2012 2013PHONY += includecheck versioncheck coccicheck export_report 2014 2015includecheck: 2016 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2017 -name '*.[hcS]' -type f -print | sort \ 2018 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2019 2020versioncheck: 2021 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2022 -name '*.[hcS]' -type f -print | sort \ 2023 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2024 2025coccicheck: 2026 $(Q)$(BASH) $(srctree)/scripts/$@ 2027 2028export_report: 2029 $(PERL) $(srctree)/scripts/export_report.pl 2030 2031PHONY += checkstack kernelrelease kernelversion image_name 2032 2033# UML needs a little special treatment here. It wants to use the host 2034# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2035# else wants $(ARCH), including people doing cross-builds, which means 2036# that $(SUBARCH) doesn't work here. 2037ifeq ($(ARCH), um) 2038CHECKSTACK_ARCH := $(SUBARCH) 2039else 2040CHECKSTACK_ARCH := $(ARCH) 2041endif 2042MINSTACKSIZE ?= 100 2043checkstack: 2044 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2045 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2046 2047kernelrelease: 2048 @$(filechk_kernel.release) 2049 2050kernelversion: 2051 @echo $(KERNELVERSION) 2052 2053image_name: 2054 @echo $(KBUILD_IMAGE) 2055 2056PHONY += run-command 2057run-command: 2058 $(Q)$(KBUILD_RUN_COMMAND) 2059 2060quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2061 cmd_rmfiles = rm -rf $(rm-files) 2062 2063# read saved command lines for existing targets 2064existing-targets := $(wildcard $(sort $(targets))) 2065 2066-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2067 2068endif # config-build 2069endif # mixed-build 2070endif # need-sub-make 2071 2072PHONY += FORCE 2073FORCE: 2074 2075# Declare the contents of the PHONY variable as phony. We keep that 2076# information in a variable so we can use it in if_changed and friends. 2077.PHONY: $(PHONY) 2078