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