1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc6 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137$(if $(word 2, $(KBUILD_EXTMOD)), \ 138 $(error building multiple external modules is not supported)) 139 140$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 141 $(error module directory path cannot contain '$x'))) 142 143# Remove trailing slashes 144ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 145KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 146endif 147 148export KBUILD_EXTMOD 149 150# backward compatibility 151KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 152 153ifeq ("$(origin W)", "command line") 154 KBUILD_EXTRA_WARN := $(W) 155endif 156 157export KBUILD_EXTRA_WARN 158 159# Kbuild will save output files in the current working directory. 160# This does not need to match to the root of the kernel source tree. 161# 162# For example, you can do this: 163# 164# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165# 166# If you want to save output files in a different location, there are 167# two syntaxes to specify it. 168# 169# 1) O= 170# Use "make O=dir/to/store/output/files/" 171# 172# 2) Set KBUILD_OUTPUT 173# Set the environment variable KBUILD_OUTPUT to point to the output directory. 174# export KBUILD_OUTPUT=dir/to/store/output/files/; make 175# 176# The O= assignment takes precedence over the KBUILD_OUTPUT environment 177# variable. 178 179ifeq ("$(origin O)", "command line") 180 KBUILD_OUTPUT := $(O) 181endif 182 183ifdef KBUILD_EXTMOD 184 ifdef KBUILD_OUTPUT 185 objtree := $(realpath $(KBUILD_OUTPUT)) 186 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 187 else 188 objtree := $(CURDIR) 189 endif 190 output := $(KBUILD_EXTMOD) 191 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 192 # Make changes the working directory. 193 srcroot := $(realpath $(KBUILD_EXTMOD)) 194 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 195else 196 objtree := . 197 output := $(KBUILD_OUTPUT) 198endif 199 200export objtree srcroot 201 202# Do we want to change the working directory? 203ifneq ($(output),) 204# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 205$(shell mkdir -p "$(output)") 206# $(realpath ...) resolves symlinks 207abs_output := $(realpath $(output)) 208$(if $(abs_output),,$(error failed to create output directory "$(output)")) 209endif 210 211ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 212$(error source directory cannot contain spaces or colons) 213endif 214 215export sub_make_done := 1 216 217endif # sub_make_done 218 219ifeq ($(abs_output),$(CURDIR)) 220# Suppress "Entering directory ..." if we are at the final work directory. 221no-print-directory := --no-print-directory 222else 223# Recursion to show "Entering directory ..." 224need-sub-make := 1 225endif 226 227ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 228# If --no-print-directory is unset, recurse once again to set it. 229# You may end up recursing into __sub-make twice. This is needed due to the 230# behavior change in GNU Make 4.4.1. 231need-sub-make := 1 232endif 233 234ifeq ($(need-sub-make),1) 235 236PHONY += $(MAKECMDGOALS) __sub-make 237 238$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 239 @: 240 241# Invoke a second make in the output directory, passing relevant variables 242__sub-make: 243 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 244 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 245 246else # need-sub-make 247 248# We process the rest of the Makefile if this is the final invocation of make 249 250ifndef KBUILD_EXTMOD 251srcroot := $(abs_srctree) 252endif 253 254ifeq ($(srcroot),$(CURDIR)) 255building_out_of_srctree := 256else 257export building_out_of_srctree := 1 258endif 259 260ifdef KBUILD_ABS_SRCTREE 261 # Do nothing. Use the absolute path. 262else ifeq ($(srcroot),$(CURDIR)) 263 # Building in the source. 264 srcroot := . 265else ifeq ($(srcroot)/,$(dir $(CURDIR))) 266 # Building in a subdirectory of the source. 267 srcroot := .. 268endif 269 270export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 271 272ifdef building_out_of_srctree 273export VPATH := $(srcroot) 274else 275VPATH := 276endif 277 278# To make sure we do not include .config for any of the *config targets 279# catch them early, and hand them over to scripts/kconfig/Makefile 280# It is allowed to specify more targets when calling make, including 281# mixing *config targets and build targets. 282# For example 'make oldconfig all'. 283# Detect when mixed targets is specified, and make a second invocation 284# of make so .config is not included in this case either (for *config). 285 286version_h := include/generated/uapi/linux/version.h 287 288clean-targets := %clean mrproper cleandocs 289no-dot-config-targets := $(clean-targets) \ 290 cscope gtags TAGS tags help% %docs check% coccicheck \ 291 $(version_h) headers headers_% archheaders archscripts \ 292 %asm-generic kernelversion %src-pkg dt_binding_check \ 293 outputmakefile rustavailable rustfmt rustfmtcheck 294no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 295 image_name 296single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 297 298config-build := 299mixed-build := 300need-config := 1 301may-sync-config := 1 302single-build := 303 304ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 305 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 306 need-config := 307 endif 308endif 309 310ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 311 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 312 may-sync-config := 313 endif 314endif 315 316need-compiler := $(may-sync-config) 317 318ifneq ($(KBUILD_EXTMOD),) 319 may-sync-config := 320endif 321 322ifeq ($(KBUILD_EXTMOD),) 323 ifneq ($(filter %config,$(MAKECMDGOALS)),) 324 config-build := 1 325 ifneq ($(words $(MAKECMDGOALS)),1) 326 mixed-build := 1 327 endif 328 endif 329endif 330 331# We cannot build single targets and the others at the same time 332ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 333 single-build := 1 334 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339# For "make -j clean all", "make -j mrproper defconfig all", etc. 340ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 341 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 342 mixed-build := 1 343 endif 344endif 345 346# install and modules_install need also be processed one by one 347ifneq ($(filter install,$(MAKECMDGOALS)),) 348 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 349 mixed-build := 1 350 endif 351endif 352 353ifdef mixed-build 354# =========================================================================== 355# We're called with mixed targets (*config and build targets). 356# Handle them one by one. 357 358PHONY += $(MAKECMDGOALS) __build_one_by_one 359 360$(MAKECMDGOALS): __build_one_by_one 361 @: 362 363__build_one_by_one: 364 $(Q)set -e; \ 365 for i in $(MAKECMDGOALS); do \ 366 $(MAKE) -f $(srctree)/Makefile $$i; \ 367 done 368 369else # !mixed-build 370 371include $(srctree)/scripts/Kbuild.include 372 373# Read KERNELRELEASE from include/config/kernel.release (if it exists) 374KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 375KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 376export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 377 378include $(srctree)/scripts/subarch.include 379 380# Cross compiling and selecting different set of gcc/bin-utils 381# --------------------------------------------------------------------------- 382# 383# When performing cross compilation for other architectures ARCH shall be set 384# to the target architecture. (See arch/* for the possibilities). 385# ARCH can be set during invocation of make: 386# make ARCH=arm64 387# Another way is to have ARCH set in the environment. 388# The default ARCH is the host where make is executed. 389 390# CROSS_COMPILE specify the prefix used for all executables used 391# during compilation. Only gcc and related bin-utils executables 392# are prefixed with $(CROSS_COMPILE). 393# CROSS_COMPILE can be set on the command line 394# make CROSS_COMPILE=aarch64-linux-gnu- 395# Alternatively CROSS_COMPILE can be set in the environment. 396# Default value for CROSS_COMPILE is not to prefix executables 397# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 398ARCH ?= $(SUBARCH) 399 400# Architecture as present in compile.h 401UTS_MACHINE := $(ARCH) 402SRCARCH := $(ARCH) 403 404# Additional ARCH settings for x86 405ifeq ($(ARCH),i386) 406 SRCARCH := x86 407endif 408ifeq ($(ARCH),x86_64) 409 SRCARCH := x86 410endif 411 412# Additional ARCH settings for sparc 413ifeq ($(ARCH),sparc32) 414 SRCARCH := sparc 415endif 416ifeq ($(ARCH),sparc64) 417 SRCARCH := sparc 418endif 419 420# Additional ARCH settings for parisc 421ifeq ($(ARCH),parisc64) 422 SRCARCH := parisc 423endif 424 425export cross_compiling := 426ifneq ($(SRCARCH),$(SUBARCH)) 427cross_compiling := 1 428endif 429 430KCONFIG_CONFIG ?= .config 431export KCONFIG_CONFIG 432 433# SHELL used by kbuild 434CONFIG_SHELL := sh 435 436HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 437HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 438HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 439 440ifneq ($(LLVM),) 441ifneq ($(filter %/,$(LLVM)),) 442LLVM_PREFIX := $(LLVM) 443else ifneq ($(filter -%,$(LLVM)),) 444LLVM_SUFFIX := $(LLVM) 445endif 446 447HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 448HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 449else 450HOSTCC = gcc 451HOSTCXX = g++ 452endif 453HOSTRUSTC = rustc 454HOSTPKG_CONFIG = pkg-config 455 456KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 457 -O2 -fomit-frame-pointer -std=gnu11 458KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 459KBUILD_USERLDFLAGS := $(USERLDFLAGS) 460 461# These flags apply to all Rust code in the tree, including the kernel and 462# host programs. 463export rust_common_flags := --edition=2021 \ 464 -Zbinary_dep_depinfo=y \ 465 -Astable_features \ 466 -Dunsafe_op_in_unsafe_fn \ 467 -Dnon_ascii_idents \ 468 -Wrust_2018_idioms \ 469 -Wunreachable_pub \ 470 -Wmissing_docs \ 471 -Wrustdoc::missing_crate_level_docs \ 472 -Wclippy::all \ 473 -Wclippy::mut_mut \ 474 -Wclippy::needless_bitwise_bool \ 475 -Wclippy::needless_continue \ 476 -Wclippy::no_mangle_with_rust_abi \ 477 -Wclippy::dbg_macro 478 479KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 480 $(HOSTCFLAGS) -I $(srctree)/scripts/include 481KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 482 -I $(srctree)/scripts/include 483KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 484 -Zallow-features= $(HOSTRUSTFLAGS) 485KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 486KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 487 488# Make variables (CC, etc...) 489CPP = $(CC) -E 490ifneq ($(LLVM),) 491CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 492LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 493AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 494NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 495OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 496OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 497READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 498STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 499else 500CC = $(CROSS_COMPILE)gcc 501LD = $(CROSS_COMPILE)ld 502AR = $(CROSS_COMPILE)ar 503NM = $(CROSS_COMPILE)nm 504OBJCOPY = $(CROSS_COMPILE)objcopy 505OBJDUMP = $(CROSS_COMPILE)objdump 506READELF = $(CROSS_COMPILE)readelf 507STRIP = $(CROSS_COMPILE)strip 508endif 509RUSTC = rustc 510RUSTDOC = rustdoc 511RUSTFMT = rustfmt 512CLIPPY_DRIVER = clippy-driver 513BINDGEN = bindgen 514PAHOLE = pahole 515RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 516LEX = flex 517YACC = bison 518AWK = awk 519INSTALLKERNEL := installkernel 520PERL = perl 521PYTHON3 = python3 522CHECK = sparse 523BASH = bash 524KGZIP = gzip 525KBZIP2 = bzip2 526KLZOP = lzop 527LZMA = lzma 528LZ4 = lz4c 529XZ = xz 530ZSTD = zstd 531 532CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 533 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 534NOSTDINC_FLAGS := 535CFLAGS_MODULE = 536RUSTFLAGS_MODULE = 537AFLAGS_MODULE = 538LDFLAGS_MODULE = 539CFLAGS_KERNEL = 540RUSTFLAGS_KERNEL = 541AFLAGS_KERNEL = 542LDFLAGS_vmlinux = 543 544# Use USERINCLUDE when you must reference the UAPI directories only. 545USERINCLUDE := \ 546 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 547 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 548 -I$(srctree)/include/uapi \ 549 -I$(objtree)/include/generated/uapi \ 550 -include $(srctree)/include/linux/compiler-version.h \ 551 -include $(srctree)/include/linux/kconfig.h 552 553# Use LINUXINCLUDE when you must reference the include/ directory. 554# Needed to be compatible with the O= option 555LINUXINCLUDE := \ 556 -I$(srctree)/arch/$(SRCARCH)/include \ 557 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 558 -I$(srctree)/include \ 559 -I$(objtree)/include \ 560 $(USERINCLUDE) 561 562KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 563 564KBUILD_CFLAGS := 565KBUILD_CFLAGS += -std=gnu11 566KBUILD_CFLAGS += -fshort-wchar 567KBUILD_CFLAGS += -funsigned-char 568KBUILD_CFLAGS += -fno-common 569KBUILD_CFLAGS += -fno-PIE 570KBUILD_CFLAGS += -fno-strict-aliasing 571 572KBUILD_CPPFLAGS := -D__KERNEL__ 573KBUILD_RUSTFLAGS := $(rust_common_flags) \ 574 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 575 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 576 -Csymbol-mangling-version=v0 \ 577 -Crelocation-model=static \ 578 -Zfunction-sections=n \ 579 -Wclippy::float_arithmetic 580 581KBUILD_AFLAGS_KERNEL := 582KBUILD_CFLAGS_KERNEL := 583KBUILD_RUSTFLAGS_KERNEL := 584KBUILD_AFLAGS_MODULE := -DMODULE 585KBUILD_CFLAGS_MODULE := -DMODULE 586KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 587KBUILD_LDFLAGS_MODULE := 588KBUILD_LDFLAGS := 589CLANG_FLAGS := 590 591ifeq ($(KBUILD_CLIPPY),1) 592 RUSTC_OR_CLIPPY_QUIET := CLIPPY 593 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 594else 595 RUSTC_OR_CLIPPY_QUIET := RUSTC 596 RUSTC_OR_CLIPPY = $(RUSTC) 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 and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 666# need export), and from include/config/auto.conf.cmd to detect the compiler 667# upgrade. 668CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 669RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 670 671ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 672include $(srctree)/scripts/Makefile.clang 673endif 674 675# Include this also for config targets because some architectures need 676# cc-cross-prefix to determine CROSS_COMPILE. 677ifdef need-compiler 678include $(srctree)/scripts/Makefile.compiler 679endif 680 681ifdef config-build 682# =========================================================================== 683# *config targets only - make sure prerequisites are updated, and descend 684# in scripts/kconfig to make the *config target 685 686# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 687# KBUILD_DEFCONFIG may point out an alternative default configuration 688# used for 'make defconfig' 689include $(srctree)/arch/$(SRCARCH)/Makefile 690export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 691 692config: outputmakefile scripts_basic FORCE 693 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 694 695%config: outputmakefile scripts_basic FORCE 696 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 697 698else #!config-build 699# =========================================================================== 700# Build targets only - this includes vmlinux, arch-specific targets, clean 701# targets and others. In general all targets except *config targets. 702 703# If building an external module we do not care about the all: rule 704# but instead __all depend on modules 705PHONY += all 706ifeq ($(KBUILD_EXTMOD),) 707__all: all 708else 709__all: modules 710endif 711 712targets := 713 714# Decide whether to build built-in, modular, or both. 715# Normally, just do built-in. 716 717KBUILD_MODULES := 718KBUILD_BUILTIN := 1 719 720# If we have only "make modules", don't compile built-in objects. 721ifeq ($(MAKECMDGOALS),modules) 722 KBUILD_BUILTIN := 723endif 724 725# If we have "make <whatever> modules", compile modules 726# in addition to whatever we do anyway. 727# Just "make" or "make all" shall build modules as well 728 729ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 730 KBUILD_MODULES := 1 731endif 732 733ifeq ($(MAKECMDGOALS),) 734 KBUILD_MODULES := 1 735endif 736 737export KBUILD_MODULES KBUILD_BUILTIN 738 739ifdef need-config 740include $(objtree)/include/config/auto.conf 741endif 742 743ifeq ($(KBUILD_EXTMOD),) 744# Objects we will link into vmlinux / subdirs we need to visit 745core-y := 746drivers-y := 747libs-y := lib/ 748endif # KBUILD_EXTMOD 749 750# The all: target is the default when no target is given on the 751# command line. 752# This allow a user to issue only 'make' to build a kernel including modules 753# Defaults to vmlinux, but the arch makefile usually adds further targets 754all: vmlinux 755 756CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 757ifdef CONFIG_CC_IS_GCC 758CFLAGS_GCOV += -fno-tree-loop-im 759endif 760export CFLAGS_GCOV 761 762# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 763ifdef CONFIG_FUNCTION_TRACER 764 CC_FLAGS_FTRACE := -pg 765endif 766 767include $(srctree)/arch/$(SRCARCH)/Makefile 768 769ifdef need-config 770ifdef may-sync-config 771# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 772# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 773# because some architectures define CROSS_COMPILE there. 774include include/config/auto.conf.cmd 775 776$(KCONFIG_CONFIG): 777 @echo >&2 '***' 778 @echo >&2 '*** Configuration file "$@" not found!' 779 @echo >&2 '***' 780 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 781 @echo >&2 '*** "make menuconfig" or "make xconfig").' 782 @echo >&2 '***' 783 @/bin/false 784 785# The actual configuration files used during the build are stored in 786# include/generated/ and include/config/. Update them if .config is newer than 787# include/config/auto.conf (which mirrors .config). 788# 789# This exploits the 'multi-target pattern rule' trick. 790# The syncconfig should be executed only once to make all the targets. 791# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 792# 793# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 794# so you cannot notice that Kconfig is waiting for the user input. 795%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 796 $(Q)$(kecho) " SYNC $@" 797 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 798else # !may-sync-config 799# External modules and some install targets need include/generated/autoconf.h 800# and include/config/auto.conf but do not care if they are up-to-date. 801# Use auto.conf to show the error message 802 803checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 804missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 805 806ifdef missing-configs 807PHONY += $(objtree)/include/config/auto.conf 808 809$(objtree)/include/config/auto.conf: 810 @echo >&2 '***' 811 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 812 @printf >&2 '*** - %s\n' $(missing-configs) 813 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 814 @echo >&2 '***' 815 @/bin/false 816endif 817 818endif # may-sync-config 819endif # need-config 820 821KBUILD_CFLAGS += -fno-delete-null-pointer-checks 822 823ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 824KBUILD_CFLAGS += -O2 825KBUILD_RUSTFLAGS += -Copt-level=2 826else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 827KBUILD_CFLAGS += -Os 828KBUILD_RUSTFLAGS += -Copt-level=s 829endif 830 831# Always set `debug-assertions` and `overflow-checks` because their default 832# depends on `opt-level` and `debug-assertions`, respectively. 833KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 834KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 835 836# Tell gcc to never replace conditional load with a non-conditional one 837ifdef CONFIG_CC_IS_GCC 838# gcc-10 renamed --param=allow-store-data-races=0 to 839# -fno-allow-store-data-races. 840KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 841KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 842endif 843 844ifdef CONFIG_READABLE_ASM 845# Disable optimizations that make assembler listings hard to read. 846# reorder blocks reorders the control in the function 847# ipa clone creates specialized cloned functions 848# partial inlining inlines only parts of functions 849KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 850endif 851 852stackp-flags-y := -fno-stack-protector 853stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 854stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 855 856KBUILD_CFLAGS += $(stackp-flags-y) 857 858KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 859KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 860 861ifdef CONFIG_FRAME_POINTER 862KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 863KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 864else 865# Some targets (ARM with Thumb2, for example), can't be built with frame 866# pointers. For those, we don't have FUNCTION_TRACER automatically 867# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 868# incompatible with -fomit-frame-pointer with current GCC, so we don't use 869# -fomit-frame-pointer with FUNCTION_TRACER. 870# In the Rust target specification, "frame-pointer" is set explicitly 871# to "may-omit". 872ifndef CONFIG_FUNCTION_TRACER 873KBUILD_CFLAGS += -fomit-frame-pointer 874endif 875endif 876 877# Initialize all stack variables with a 0xAA pattern. 878ifdef CONFIG_INIT_STACK_ALL_PATTERN 879KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 880endif 881 882# Initialize all stack variables with a zero value. 883ifdef CONFIG_INIT_STACK_ALL_ZERO 884KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 885ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 886# https://github.com/llvm/llvm-project/issues/44842 887CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 888export CC_AUTO_VAR_INIT_ZERO_ENABLER 889KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 890endif 891endif 892 893# While VLAs have been removed, GCC produces unreachable stack probes 894# for the randomize_kstack_offset feature. Disable it for all compilers. 895KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 896 897# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 898ifdef CONFIG_ZERO_CALL_USED_REGS 899KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 900endif 901 902ifdef CONFIG_FUNCTION_TRACER 903ifdef CONFIG_FTRACE_MCOUNT_USE_CC 904 CC_FLAGS_FTRACE += -mrecord-mcount 905 ifdef CONFIG_HAVE_NOP_MCOUNT 906 ifeq ($(call cc-option-yn, -mnop-mcount),y) 907 CC_FLAGS_FTRACE += -mnop-mcount 908 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 909 endif 910 endif 911endif 912ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 913 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 914 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 915 endif 916endif 917ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 918 ifdef CONFIG_HAVE_C_RECORDMCOUNT 919 BUILD_C_RECORDMCOUNT := y 920 export BUILD_C_RECORDMCOUNT 921 endif 922endif 923ifdef CONFIG_HAVE_FENTRY 924 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 925 ifeq ($(call cc-option-yn, -mfentry),y) 926 CC_FLAGS_FTRACE += -mfentry 927 CC_FLAGS_USING += -DCC_USING_FENTRY 928 endif 929endif 930export CC_FLAGS_FTRACE 931KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 932KBUILD_AFLAGS += $(CC_FLAGS_USING) 933endif 934 935# We trigger additional mismatches with less inlining 936ifdef CONFIG_DEBUG_SECTION_MISMATCH 937KBUILD_CFLAGS += -fno-inline-functions-called-once 938endif 939 940# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 941ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 942KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 943KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 944LDFLAGS_vmlinux += --gc-sections 945endif 946 947ifdef CONFIG_SHADOW_CALL_STACK 948ifndef CONFIG_DYNAMIC_SCS 949CC_FLAGS_SCS := -fsanitize=shadow-call-stack 950KBUILD_CFLAGS += $(CC_FLAGS_SCS) 951KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 952endif 953export CC_FLAGS_SCS 954endif 955 956ifdef CONFIG_LTO_CLANG 957ifdef CONFIG_LTO_CLANG_THIN 958CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 959else 960CC_FLAGS_LTO := -flto 961endif 962CC_FLAGS_LTO += -fvisibility=hidden 963 964# Limit inlining across translation units to reduce binary size 965KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 966endif 967 968ifdef CONFIG_LTO 969KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 970KBUILD_AFLAGS += -fno-lto 971export CC_FLAGS_LTO 972endif 973 974ifdef CONFIG_CFI_CLANG 975CC_FLAGS_CFI := -fsanitize=kcfi 976ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 977 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 978endif 979ifdef CONFIG_RUST 980 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 981 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 982 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 983 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 984 export RUSTC_FLAGS_CFI 985endif 986KBUILD_CFLAGS += $(CC_FLAGS_CFI) 987export CC_FLAGS_CFI 988endif 989 990# Architectures can define flags to add/remove for floating-point support 991CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 992export CC_FLAGS_FPU 993export CC_FLAGS_NO_FPU 994 995ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 996# Set the minimal function alignment. Use the newer GCC option 997# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 998# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 999ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1000KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1001else 1002KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1003endif 1004endif 1005 1006# arch Makefile may override CC so keep this after arch Makefile is included 1007NOSTDINC_FLAGS += -nostdinc 1008 1009# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1010# the kernel uses only C99 flexible arrays for dynamically sized trailing 1011# arrays. Enforce this for everything that may examine structure sizes and 1012# perform bounds checking. 1013KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1014 1015#Currently, disable -Wstringop-overflow for GCC 11, globally. 1016KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1017KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1018 1019# disable invalid "can't wrap" optimizations for signed / pointers 1020KBUILD_CFLAGS += -fno-strict-overflow 1021 1022# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1023KBUILD_CFLAGS += -fno-stack-check 1024 1025# conserve stack if available 1026ifdef CONFIG_CC_IS_GCC 1027KBUILD_CFLAGS += -fconserve-stack 1028endif 1029 1030# change __FILE__ to the relative path from the srctree 1031KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1032 1033# include additional Makefiles when needed 1034include-y := scripts/Makefile.extrawarn 1035include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1036include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1037include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1038include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1039include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1040include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1041include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1042include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1043include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1044include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1045include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1046 1047include $(addprefix $(srctree)/, $(include-y)) 1048 1049# scripts/Makefile.gcc-plugins is intentionally included last. 1050# Do not add $(call cc-option,...) below this line. When you build the kernel 1051# from the clean source tree, the GCC plugins do not exist at this point. 1052 1053# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1054KBUILD_CPPFLAGS += $(KCPPFLAGS) 1055KBUILD_AFLAGS += $(KAFLAGS) 1056KBUILD_CFLAGS += $(KCFLAGS) 1057KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1058 1059KBUILD_LDFLAGS_MODULE += --build-id=sha1 1060LDFLAGS_vmlinux += --build-id=sha1 1061 1062KBUILD_LDFLAGS += -z noexecstack 1063ifeq ($(CONFIG_LD_IS_BFD),y) 1064KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1065endif 1066 1067ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1068LDFLAGS_vmlinux += -X 1069endif 1070 1071ifeq ($(CONFIG_RELR),y) 1072# ld.lld before 15 did not support -z pack-relative-relocs. 1073LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1074endif 1075 1076# We never want expected sections to be placed heuristically by the 1077# linker. All sections should be explicitly named in the linker script. 1078ifdef CONFIG_LD_ORPHAN_WARN 1079LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1080endif 1081 1082# Align the bit size of userspace programs with the kernel 1083KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1084KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1085 1086# make the checker run with the right architecture 1087CHECKFLAGS += --arch=$(ARCH) 1088 1089# insure the checker run with the right endianness 1090CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1091 1092# the checker needs the correct machine size 1093CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1094 1095# Default kernel image to build when no specific target is given. 1096# KBUILD_IMAGE may be overruled on the command line or 1097# set in the environment 1098# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1099# this default value 1100export KBUILD_IMAGE ?= vmlinux 1101 1102# 1103# INSTALL_PATH specifies where to place the updated kernel and system map 1104# images. Default is /boot, but you can set it to other values 1105export INSTALL_PATH ?= /boot 1106 1107# 1108# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1109# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1110# an argument if needed. Otherwise it defaults to the kernel install path 1111# 1112export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1113 1114# 1115# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1116# relocations required by build roots. This is not defined in the 1117# makefile but the argument can be passed to make if needed. 1118# 1119 1120MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1121export MODLIB 1122 1123PHONY += prepare0 1124 1125export extmod_prefix = 1126export MODORDER := $(extmod_prefix)modules.order 1127export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1128 1129ifeq ($(KBUILD_EXTMOD),) 1130 1131build-dir := . 1132clean-dirs := $(sort . Documentation \ 1133 $(patsubst %/,%,$(filter %/, $(core-) \ 1134 $(drivers-) $(libs-)))) 1135 1136export ARCH_CORE := $(core-y) 1137export ARCH_LIB := $(filter %/, $(libs-y)) 1138export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1139# Externally visible symbols (used by link-vmlinux.sh) 1140 1141KBUILD_VMLINUX_OBJS := ./built-in.a 1142ifdef CONFIG_MODULES 1143KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1144KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1145else 1146KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1147endif 1148 1149export KBUILD_VMLINUX_LIBS 1150export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1151 1152ifdef CONFIG_TRIM_UNUSED_KSYMS 1153# For the kernel to actually contain only the needed exported symbols, 1154# we have to build modules as well to determine what those symbols are. 1155KBUILD_MODULES := 1 1156endif 1157 1158# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1159quiet_cmd_ar_vmlinux.a = AR $@ 1160 cmd_ar_vmlinux.a = \ 1161 rm -f $@; \ 1162 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1163 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1164 1165targets += vmlinux.a 1166vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1167 $(call if_changed,ar_vmlinux.a) 1168 1169PHONY += vmlinux_o 1170vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1172 1173vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1174 @: 1175 1176PHONY += vmlinux 1177# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1178# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1179# unrelated; the decompressors just happen to have the same base name, 1180# arch/*/boot/compressed/vmlinux. 1181# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1182# 1183# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1184# https://savannah.gnu.org/bugs/?61463 1185# For Make > 4.4, the following simple code will work: 1186# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1187vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1188vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1189vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1190 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1191 1192# The actual objects are generated when descending, 1193# make sure no implicit rule kicks in 1194$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1195 1196ifeq ($(origin KERNELRELEASE),file) 1197filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1198else 1199filechk_kernel.release = echo $(KERNELRELEASE) 1200endif 1201 1202# Store (new) KERNELRELEASE string in include/config/kernel.release 1203include/config/kernel.release: FORCE 1204 $(call filechk,kernel.release) 1205 1206# Additional helpers built in scripts/ 1207# Carefully list dependencies so we do not try to build scripts twice 1208# in parallel 1209PHONY += scripts 1210scripts: scripts_basic scripts_dtc 1211 $(Q)$(MAKE) $(build)=$(@) 1212 1213# Things we need to do before we recursively start building the kernel 1214# or the modules are listed in "prepare". 1215# A multi level approach is used. prepareN is processed before prepareN-1. 1216# archprepare is used in arch Makefiles and when processed asm symlink, 1217# version.h and scripts_basic is processed / created. 1218 1219PHONY += prepare archprepare 1220 1221archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1222 asm-generic $(version_h) include/generated/utsrelease.h \ 1223 include/generated/compile.h include/generated/autoconf.h \ 1224 include/generated/rustc_cfg remove-stale-files 1225 1226prepare0: archprepare 1227 $(Q)$(MAKE) $(build)=scripts/mod 1228 $(Q)$(MAKE) $(build)=. prepare 1229 1230# All the preparing.. 1231prepare: prepare0 1232ifdef CONFIG_RUST 1233 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1234 $(Q)$(MAKE) $(build)=rust 1235endif 1236 1237PHONY += remove-stale-files 1238remove-stale-files: 1239 $(Q)$(srctree)/scripts/remove-stale-files 1240 1241# Support for using generic headers in asm-generic 1242asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1243 1244PHONY += asm-generic uapi-asm-generic 1245asm-generic: uapi-asm-generic 1246 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1247 generic=include/asm-generic 1248uapi-asm-generic: 1249 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1250 generic=include/uapi/asm-generic 1251 1252# Generate some files 1253# --------------------------------------------------------------------------- 1254 1255# KERNELRELEASE can change from a few different places, meaning version.h 1256# needs to be updated, so this check is forced on all builds 1257 1258uts_len := 64 1259define filechk_utsrelease.h 1260 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1261 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1262 exit 1; \ 1263 fi; \ 1264 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1265endef 1266 1267define filechk_version.h 1268 if [ $(SUBLEVEL) -gt 255 ]; then \ 1269 echo \#define LINUX_VERSION_CODE $(shell \ 1270 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1271 else \ 1272 echo \#define LINUX_VERSION_CODE $(shell \ 1273 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1274 fi; \ 1275 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1276 ((c) > 255 ? 255 : (c)))'; \ 1277 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1278 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1279 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1280endef 1281 1282$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1283$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1284$(version_h): FORCE 1285 $(call filechk,version.h) 1286 1287include/generated/utsrelease.h: include/config/kernel.release FORCE 1288 $(call filechk,utsrelease.h) 1289 1290filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1291 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1292 1293include/generated/compile.h: FORCE 1294 $(call filechk,compile.h) 1295 1296PHONY += headerdep 1297headerdep: 1298 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1299 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1300 1301# --------------------------------------------------------------------------- 1302# Kernel headers 1303 1304#Default location for installed headers 1305export INSTALL_HDR_PATH = $(objtree)/usr 1306 1307quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1308 cmd_headers_install = \ 1309 mkdir -p $(INSTALL_HDR_PATH); \ 1310 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1311 usr/include $(INSTALL_HDR_PATH) 1312 1313PHONY += headers_install 1314headers_install: headers 1315 $(call cmd,headers_install) 1316 1317PHONY += archheaders archscripts 1318 1319hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1320 1321PHONY += headers 1322headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1323 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1324 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1325 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1326 1327ifdef CONFIG_HEADERS_INSTALL 1328prepare: headers 1329endif 1330 1331PHONY += scripts_unifdef 1332scripts_unifdef: scripts_basic 1333 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1334 1335# --------------------------------------------------------------------------- 1336# Install 1337 1338# Many distributions have the custom install script, /sbin/installkernel. 1339# If DKMS is installed, 'make install' will eventually recurse back 1340# to this Makefile to build and install external modules. 1341# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1342 1343quiet_cmd_install = INSTALL $(INSTALL_PATH) 1344 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1345 1346# --------------------------------------------------------------------------- 1347# vDSO install 1348 1349PHONY += vdso_install 1350vdso_install: export INSTALL_FILES = $(vdso-install-y) 1351vdso_install: 1352 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1353 1354# --------------------------------------------------------------------------- 1355# Tools 1356 1357ifdef CONFIG_OBJTOOL 1358prepare: tools/objtool 1359endif 1360 1361ifdef CONFIG_BPF 1362ifdef CONFIG_DEBUG_INFO_BTF 1363prepare: tools/bpf/resolve_btfids 1364endif 1365endif 1366 1367# The tools build system is not a part of Kbuild and tends to introduce 1368# its own unique issues. If you need to integrate a new tool into Kbuild, 1369# please consider locating that tool outside the tools/ tree and using the 1370# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1371# here. See Documentation/kbuild/makefiles.rst for details. 1372 1373PHONY += resolve_btfids_clean 1374 1375resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1376 1377# tools/bpf/resolve_btfids directory might not exist 1378# in output directory, skip its clean in that case 1379resolve_btfids_clean: 1380ifneq ($(wildcard $(resolve_btfids_O)),) 1381 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1382endif 1383 1384# Clear a bunch of variables before executing the submake 1385ifeq ($(quiet),silent_) 1386tools_silent=s 1387endif 1388 1389tools/: FORCE 1390 $(Q)mkdir -p $(objtree)/tools 1391 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1392 1393tools/%: FORCE 1394 $(Q)mkdir -p $(objtree)/tools 1395 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1396 1397# --------------------------------------------------------------------------- 1398# Kernel selftest 1399 1400PHONY += kselftest 1401kselftest: headers 1402 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1403 1404kselftest-%: headers FORCE 1405 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1406 1407PHONY += kselftest-merge 1408kselftest-merge: 1409 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1410 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1411 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1412 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1413 1414# --------------------------------------------------------------------------- 1415# Devicetree files 1416 1417ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1418dtstree := arch/$(SRCARCH)/boot/dts 1419endif 1420 1421ifneq ($(dtstree),) 1422 1423%.dtb: dtbs_prepare 1424 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1425 1426%.dtbo: dtbs_prepare 1427 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1428 1429PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1430dtbs: dtbs_prepare 1431 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1432 1433# include/config/kernel.release is actually needed when installing DTBs because 1434# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1435# dtbs_install depend on it as dtbs_install may run as root. 1436dtbs_prepare: include/config/kernel.release scripts_dtc 1437 1438ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1439export CHECK_DTBS=y 1440endif 1441 1442ifneq ($(CHECK_DTBS),) 1443dtbs_prepare: dt_binding_schemas 1444endif 1445 1446dtbs_check: dtbs 1447 1448dtbs_install: 1449 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1450 1451ifdef CONFIG_OF_EARLY_FLATTREE 1452all: dtbs 1453endif 1454 1455ifdef CONFIG_GENERIC_BUILTIN_DTB 1456vmlinux: dtbs 1457endif 1458 1459endif 1460 1461PHONY += scripts_dtc 1462scripts_dtc: scripts_basic 1463 $(Q)$(MAKE) $(build)=scripts/dtc 1464 1465ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1466export CHECK_DTBS=y 1467endif 1468 1469PHONY += dt_binding_check dt_binding_schemas 1470dt_binding_check: dt_binding_schemas scripts_dtc 1471 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1472 1473dt_binding_schemas: 1474 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1475 1476PHONY += dt_compatible_check 1477dt_compatible_check: dt_binding_schemas 1478 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1479 1480# --------------------------------------------------------------------------- 1481# Modules 1482 1483ifdef CONFIG_MODULES 1484 1485# By default, build modules as well 1486 1487all: modules 1488 1489# When we're building modules with modversions, we need to consider 1490# the built-in objects during the descend as well, in order to 1491# make sure the checksums are up to date before we record them. 1492ifdef CONFIG_MODVERSIONS 1493 KBUILD_BUILTIN := 1 1494endif 1495 1496# Build modules 1497# 1498 1499# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1500# is an exception. 1501ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1502KBUILD_BUILTIN := 1 1503modules: vmlinux 1504endif 1505 1506modules: modules_prepare 1507 1508# Target to prepare building external modules 1509modules_prepare: prepare 1510 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1511 1512endif # CONFIG_MODULES 1513 1514### 1515# Cleaning is done on three levels. 1516# make clean Delete most generated files 1517# Leave enough to build external modules 1518# make mrproper Delete the current configuration, and all generated files 1519# make distclean Remove editor backup files, patch leftover files and the like 1520 1521# Directories & files removed with 'make clean' 1522CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1523 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1524 modules.builtin.ranges vmlinux.o.map \ 1525 compile_commands.json rust/test \ 1526 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1527 .builtin-dtbs-list .builtin-dtb.S 1528 1529# Directories & files removed with 'make mrproper' 1530MRPROPER_FILES += include/config include/generated \ 1531 arch/$(SRCARCH)/include/generated .objdiff \ 1532 debian snap tar-install PKGBUILD pacman \ 1533 .config .config.old .version \ 1534 Module.symvers \ 1535 certs/signing_key.pem \ 1536 certs/x509.genkey \ 1537 vmlinux-gdb.py \ 1538 rpmbuild \ 1539 rust/libmacros.so 1540 1541# clean - Delete most, but leave enough to build external modules 1542# 1543clean: private rm-files := $(CLEAN_FILES) 1544 1545PHONY += archclean vmlinuxclean 1546 1547vmlinuxclean: 1548 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1549 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1550 1551clean: archclean vmlinuxclean resolve_btfids_clean 1552 1553# mrproper - Delete all generated files, including .config 1554# 1555mrproper: private rm-files := $(MRPROPER_FILES) 1556mrproper-dirs := $(addprefix _mrproper_,scripts) 1557 1558PHONY += $(mrproper-dirs) mrproper 1559$(mrproper-dirs): 1560 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1561 1562mrproper: clean $(mrproper-dirs) 1563 $(call cmd,rmfiles) 1564 @find . $(RCS_FIND_IGNORE) \ 1565 \( -name '*.rmeta' \) \ 1566 -type f -print | xargs rm -f 1567 1568# distclean 1569# 1570PHONY += distclean 1571 1572distclean: mrproper 1573 @find . $(RCS_FIND_IGNORE) \ 1574 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1575 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1576 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1577 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1578 -type f -print | xargs rm -f 1579 1580 1581# Packaging of the kernel to various formats 1582# --------------------------------------------------------------------------- 1583 1584%src-pkg: FORCE 1585 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1586%pkg: include/config/kernel.release FORCE 1587 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1588 1589# Brief documentation of the typical targets used 1590# --------------------------------------------------------------------------- 1591 1592boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1593boards := $(sort $(notdir $(boards))) 1594board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1595board-dirs := $(sort $(notdir $(board-dirs:/=))) 1596 1597PHONY += help 1598help: 1599 @echo 'Cleaning targets:' 1600 @echo ' clean - Remove most generated files but keep the config and' 1601 @echo ' enough build support to build external modules' 1602 @echo ' mrproper - Remove all generated files + config + various backup files' 1603 @echo ' distclean - mrproper + remove editor backup and patch files' 1604 @echo '' 1605 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1606 @echo '' 1607 @echo 'Other generic targets:' 1608 @echo ' all - Build all targets marked with [*]' 1609 @echo '* vmlinux - Build the bare kernel' 1610 @echo '* modules - Build all modules' 1611 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1612 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1613 @echo ' dir/ - Build all files in dir and below' 1614 @echo ' dir/file.[ois] - Build specified target only' 1615 @echo ' dir/file.ll - Build the LLVM assembly file' 1616 @echo ' (requires compiler support for LLVM assembly generation)' 1617 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1618 @echo ' (requires a recent binutils and recent build (System.map))' 1619 @echo ' dir/file.ko - Build module including final link' 1620 @echo ' modules_prepare - Set up for building external modules' 1621 @echo ' tags/TAGS - Generate tags file for editors' 1622 @echo ' cscope - Generate cscope index' 1623 @echo ' gtags - Generate GNU GLOBAL index' 1624 @echo ' kernelrelease - Output the release version string (use with make -s)' 1625 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1626 @echo ' image_name - Output the image name (use with make -s)' 1627 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1628 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1629 echo '' 1630 @echo 'Static analysers:' 1631 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1632 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1633 @echo ' versioncheck - Sanity check on version.h usage' 1634 @echo ' includecheck - Check for duplicate included header files' 1635 @echo ' export_report - List the usages of all exported symbols' 1636 @echo ' headerdep - Detect inclusion cycles in headers' 1637 @echo ' coccicheck - Check with Coccinelle' 1638 @echo ' clang-analyzer - Check with clang static analyzer' 1639 @echo ' clang-tidy - Check with clang-tidy' 1640 @echo '' 1641 @echo 'Tools:' 1642 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1643 @echo '' 1644 @echo 'Kernel selftest:' 1645 @echo ' kselftest - Build and run kernel selftest' 1646 @echo ' Build, install, and boot kernel before' 1647 @echo ' running kselftest on it' 1648 @echo ' Run as root for full coverage' 1649 @echo ' kselftest-all - Build kernel selftest' 1650 @echo ' kselftest-install - Build and install kernel selftest' 1651 @echo ' kselftest-clean - Remove all generated kselftest files' 1652 @echo ' kselftest-merge - Merge all the config dependencies of' 1653 @echo ' kselftest to existing .config.' 1654 @echo '' 1655 @echo 'Rust targets:' 1656 @echo ' rustavailable - Checks whether the Rust toolchain is' 1657 @echo ' available and, if not, explains why.' 1658 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1659 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1660 @echo ' is formatted, printing a diff otherwise.' 1661 @echo ' rustdoc - Generate Rust documentation' 1662 @echo ' (requires kernel .config)' 1663 @echo ' rusttest - Runs the Rust tests' 1664 @echo ' (requires kernel .config; downloads external repos)' 1665 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1666 @echo ' (requires kernel .config)' 1667 @echo ' dir/file.[os] - Build specified target only' 1668 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1669 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1670 @echo ' The output is not intended to be compilable.' 1671 @echo ' dir/file.ll - Build the LLVM assembly file' 1672 @echo '' 1673 @$(if $(dtstree), \ 1674 echo 'Devicetree:'; \ 1675 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1676 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1677 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1678 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1679 echo ' dtbs_check - Validate device tree source files';\ 1680 echo '') 1681 1682 @echo 'Userspace tools targets:' 1683 @echo ' use "make tools/help"' 1684 @echo ' or "cd tools; make help"' 1685 @echo '' 1686 @echo 'Kernel packaging:' 1687 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1688 @echo '' 1689 @echo 'Documentation targets:' 1690 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1691 @echo '' 1692 @echo 'Architecture-specific targets ($(SRCARCH)):' 1693 @$(or $(archhelp),\ 1694 echo ' No architecture-specific help defined for $(SRCARCH)') 1695 @echo '' 1696 @$(if $(boards), \ 1697 $(foreach b, $(boards), \ 1698 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1699 echo '') 1700 @$(if $(board-dirs), \ 1701 $(foreach b, $(board-dirs), \ 1702 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1703 printf " %-16s - Show all of the above\\n" help-boards; \ 1704 echo '') 1705 1706 @echo ' make V=n [targets] 1: verbose build' 1707 @echo ' 2: give reason for rebuild of target' 1708 @echo ' V=1 and V=2 can be combined with V=12' 1709 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1710 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1711 @echo ' (sparse by default)' 1712 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1713 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1714 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1715 @echo ' 1: warnings which may be relevant and do not occur too often' 1716 @echo ' 2: warnings which occur quite often but may still be relevant' 1717 @echo ' 3: more obscure warnings, can most likely be ignored' 1718 @echo ' c: extra checks in the configuration stage (Kconfig)' 1719 @echo ' e: warnings are being treated as errors' 1720 @echo ' Multiple levels can be combined with W=12 or W=123' 1721 @$(if $(dtstree), \ 1722 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1723 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1724 ) 1725 @echo '' 1726 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1727 @echo 'For further info see the ./README file' 1728 1729 1730help-board-dirs := $(addprefix help-,$(board-dirs)) 1731 1732help-boards: $(help-board-dirs) 1733 1734boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1735 1736$(help-board-dirs): help-%: 1737 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1738 @$(if $(boards-per-dir), \ 1739 $(foreach b, $(boards-per-dir), \ 1740 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1741 echo '') 1742 1743 1744# Documentation targets 1745# --------------------------------------------------------------------------- 1746DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1747 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1748PHONY += $(DOC_TARGETS) 1749$(DOC_TARGETS): 1750 $(Q)$(MAKE) $(build)=Documentation $@ 1751 1752 1753# Rust targets 1754# --------------------------------------------------------------------------- 1755 1756# "Is Rust available?" target 1757PHONY += rustavailable 1758rustavailable: 1759 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1760 1761# Documentation target 1762# 1763# Using the singular to avoid running afoul of `no-dot-config-targets`. 1764PHONY += rustdoc 1765rustdoc: prepare 1766 $(Q)$(MAKE) $(build)=rust $@ 1767 1768# Testing target 1769PHONY += rusttest 1770rusttest: prepare 1771 $(Q)$(MAKE) $(build)=rust $@ 1772 1773# Formatting targets 1774PHONY += rustfmt rustfmtcheck 1775 1776rustfmt: 1777 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1778 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1779 | xargs $(RUSTFMT) $(rustfmt_flags) 1780 1781rustfmtcheck: rustfmt_flags = --check 1782rustfmtcheck: rustfmt 1783 1784# Misc 1785# --------------------------------------------------------------------------- 1786 1787PHONY += misc-check 1788misc-check: 1789 $(Q)$(srctree)/scripts/misc-check 1790 1791all: misc-check 1792 1793PHONY += scripts_gdb 1794scripts_gdb: prepare0 1795 $(Q)$(MAKE) $(build)=scripts/gdb 1796 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1797 1798ifdef CONFIG_GDB_SCRIPTS 1799all: scripts_gdb 1800endif 1801 1802else # KBUILD_EXTMOD 1803 1804filechk_kernel.release = echo $(KERNELRELEASE) 1805 1806### 1807# External module support. 1808# When building external modules the kernel used as basis is considered 1809# read-only, and no consistency checks are made and the make 1810# system is not used on the basis kernel. If updates are required 1811# in the basis kernel ordinary make commands (without M=...) must be used. 1812 1813# We are always building only modules. 1814KBUILD_BUILTIN := 1815KBUILD_MODULES := 1 1816 1817build-dir := . 1818 1819clean-dirs := . 1820clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1821 1822PHONY += prepare 1823# now expand this into a simple variable to reduce the cost of shell evaluations 1824prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1825prepare: 1826 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1827 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1828 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1829 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1830 fi 1831 1832PHONY += help 1833help: 1834 @echo ' Building external modules.' 1835 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1836 @echo '' 1837 @echo ' modules - default target, build the module(s)' 1838 @echo ' modules_install - install the module' 1839 @echo ' clean - remove generated files in module directory only' 1840 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1841 @echo '' 1842 1843ifndef CONFIG_MODULES 1844modules modules_install: __external_modules_error 1845__external_modules_error: 1846 @echo >&2 '***' 1847 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1848 @echo >&2 '*** You cannot build or install external modules.' 1849 @echo >&2 '***' 1850 @false 1851endif 1852 1853endif # KBUILD_EXTMOD 1854 1855# --------------------------------------------------------------------------- 1856# Modules 1857 1858PHONY += modules modules_install modules_sign modules_prepare 1859 1860modules_install: 1861 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1862 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1863 1864ifeq ($(CONFIG_MODULE_SIG),y) 1865# modules_sign is a subset of modules_install. 1866# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1867modules_sign: modules_install 1868 @: 1869else 1870modules_sign: 1871 @echo >&2 '***' 1872 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1873 @echo >&2 '***' 1874 @false 1875endif 1876 1877ifdef CONFIG_MODULES 1878 1879$(MODORDER): $(build-dir) 1880 @: 1881 1882# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1883# This is solely useful to speed up test compiles. 1884modules: modpost 1885ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1886 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1887endif 1888 1889PHONY += modules_check 1890modules_check: $(MODORDER) 1891 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1892 1893else # CONFIG_MODULES 1894 1895modules: 1896 @: 1897 1898KBUILD_MODULES := 1899 1900endif # CONFIG_MODULES 1901 1902PHONY += modpost 1903modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1904 $(if $(KBUILD_MODULES), modules_check) 1905 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1906 1907# Single targets 1908# --------------------------------------------------------------------------- 1909# To build individual files in subdirectories, you can do like this: 1910# 1911# make foo/bar/baz.s 1912# 1913# The supported suffixes for single-target are listed in 'single-targets' 1914# 1915# To build only under specific subdirectories, you can do like this: 1916# 1917# make foo/bar/baz/ 1918 1919ifdef single-build 1920 1921# .ko is special because modpost is needed 1922single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1923single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1924 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1925 1926$(single-ko): single_modules 1927 @: 1928$(single-no-ko): $(build-dir) 1929 @: 1930 1931# Remove MODORDER when done because it is not the real one. 1932PHONY += single_modules 1933single_modules: $(single-no-ko) modules_prepare 1934 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1935 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1936ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1937 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1938endif 1939 $(Q)rm -f $(MODORDER) 1940 1941single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1942 1943KBUILD_MODULES := 1 1944 1945endif 1946 1947# Preset locale variables to speed up the build process. Limit locale 1948# tweaks to this spot to avoid wrong language settings when running 1949# make menuconfig etc. 1950# Error messages still appears in the original language 1951PHONY += $(build-dir) 1952$(build-dir): prepare 1953 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1954 1955clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1956PHONY += $(clean-dirs) clean 1957$(clean-dirs): 1958 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1959 1960clean: $(clean-dirs) 1961 $(call cmd,rmfiles) 1962 @find . $(RCS_FIND_IGNORE) \ 1963 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1964 -o -name '*.ko.*' \ 1965 -o -name '*.dtb' -o -name '*.dtbo' \ 1966 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1967 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1968 -o -name '*.dwo' -o -name '*.lst' \ 1969 -o -name '*.su' -o -name '*.mod' \ 1970 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1971 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1972 -o -name '*.asn1.[ch]' \ 1973 -o -name '*.symtypes' -o -name 'modules.order' \ 1974 -o -name '*.c.[012]*.*' \ 1975 -o -name '*.ll' \ 1976 -o -name '*.gcno' \ 1977 \) -type f -print \ 1978 -o -name '.tmp_*' -print \ 1979 | xargs rm -rf 1980 1981# Generate tags for editors 1982# --------------------------------------------------------------------------- 1983quiet_cmd_tags = GEN $@ 1984 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1985 1986tags TAGS cscope gtags: FORCE 1987 $(call cmd,tags) 1988 1989# Generate rust-project.json (a file that describes the structure of non-Cargo 1990# Rust projects) for rust-analyzer (an implementation of the Language Server 1991# Protocol). 1992PHONY += rust-analyzer 1993rust-analyzer: 1994 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1995ifdef KBUILD_EXTMOD 1996# FIXME: external modules must not descend into a sub-directory of the kernel 1997 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 1998else 1999 $(Q)$(MAKE) $(build)=rust $@ 2000endif 2001 2002# Script to generate missing namespace dependencies 2003# --------------------------------------------------------------------------- 2004 2005PHONY += nsdeps 2006nsdeps: export KBUILD_NSDEPS=1 2007nsdeps: modules 2008 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2009 2010# Clang Tooling 2011# --------------------------------------------------------------------------- 2012 2013quiet_cmd_gen_compile_commands = GEN $@ 2014 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2015 2016$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2017 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2018 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2019 $(call if_changed,gen_compile_commands) 2020 2021targets += $(extmod_prefix)compile_commands.json 2022 2023PHONY += clang-tidy clang-analyzer 2024 2025ifdef CONFIG_CC_IS_CLANG 2026quiet_cmd_clang_tools = CHECK $< 2027 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2028 2029clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2030 $(call cmd,clang_tools) 2031else 2032clang-tidy clang-analyzer: 2033 @echo "$@ requires CC=clang" >&2 2034 @false 2035endif 2036 2037# Scripts to check various things for consistency 2038# --------------------------------------------------------------------------- 2039 2040PHONY += includecheck versioncheck coccicheck export_report 2041 2042includecheck: 2043 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2044 -name '*.[hcS]' -type f -print | sort \ 2045 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2046 2047versioncheck: 2048 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2049 -name '*.[hcS]' -type f -print | sort \ 2050 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2051 2052coccicheck: 2053 $(Q)$(BASH) $(srctree)/scripts/$@ 2054 2055export_report: 2056 $(PERL) $(srctree)/scripts/export_report.pl 2057 2058PHONY += checkstack kernelrelease kernelversion image_name 2059 2060# UML needs a little special treatment here. It wants to use the host 2061# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2062# else wants $(ARCH), including people doing cross-builds, which means 2063# that $(SUBARCH) doesn't work here. 2064ifeq ($(ARCH), um) 2065CHECKSTACK_ARCH := $(SUBARCH) 2066else 2067CHECKSTACK_ARCH := $(ARCH) 2068endif 2069MINSTACKSIZE ?= 100 2070checkstack: 2071 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2072 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2073 2074kernelrelease: 2075 @$(filechk_kernel.release) 2076 2077kernelversion: 2078 @echo $(KERNELVERSION) 2079 2080image_name: 2081 @echo $(KBUILD_IMAGE) 2082 2083PHONY += run-command 2084run-command: 2085 $(Q)$(KBUILD_RUN_COMMAND) 2086 2087quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2088 cmd_rmfiles = rm -rf $(rm-files) 2089 2090# read saved command lines for existing targets 2091existing-targets := $(wildcard $(sort $(targets))) 2092 2093-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2094 2095endif # config-build 2096endif # mixed-build 2097endif # need-sub-make 2098 2099PHONY += FORCE 2100FORCE: 2101 2102# Declare the contents of the PHONY variable as phony. We keep that 2103# information in a variable so we can use it in if_changed and friends. 2104.PHONY: $(PHONY) 2105