1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 11 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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_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, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(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 := $(W) 155endif 156 157export KBUILD_EXTRA_WARN 158 159# Kbuild will save output files in the current working directory. 160# This does not need to match to the root of the kernel source tree. 161# 162# For example, you can do this: 163# 164# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165# 166# If you want to save output files in a different location, there are 167# two syntaxes to specify it. 168# 169# 1) O= 170# Use "make O=dir/to/store/output/files/" 171# 172# 2) Set KBUILD_OUTPUT 173# Set the environment variable KBUILD_OUTPUT to point to the output directory. 174# export KBUILD_OUTPUT=dir/to/store/output/files/; make 175# 176# The O= assignment takes precedence over the KBUILD_OUTPUT environment 177# variable. 178 179# Do we want to change the working directory? 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifneq ($(KBUILD_OUTPUT),) 185# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 186$(shell mkdir -p "$(KBUILD_OUTPUT)") 187# $(realpath ...) resolves symlinks 188abs_objtree := $(realpath $(KBUILD_OUTPUT)) 189$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 193$(error source directory cannot contain spaces or colons) 194endif 195 196export sub_make_done := 1 197 198endif # sub_make_done 199 200ifeq ($(abs_objtree),$(CURDIR)) 201# Suppress "Entering directory ..." if we are at the final work directory. 202no-print-directory := --no-print-directory 203else 204# Recursion to show "Entering directory ..." 205need-sub-make := 1 206endif 207 208ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 209# If --no-print-directory is unset, recurse once again to set it. 210# You may end up recursing into __sub-make twice. This is needed due to the 211# behavior change in GNU Make 4.4.1. 212need-sub-make := 1 213endif 214 215ifeq ($(need-sub-make),1) 216 217PHONY += $(MAKECMDGOALS) __sub-make 218 219$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 220 @: 221 222# Invoke a second make in the output directory, passing relevant variables 223__sub-make: 224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 226 227else # need-sub-make 228 229# We process the rest of the Makefile if this is the final invocation of make 230 231ifeq ($(abs_srctree),$(abs_objtree)) 232 # building in the source tree 233 srctree := . 234 building_out_of_srctree := 235else 236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 237 # building in a subdirectory of the source tree 238 srctree := .. 239 else 240 srctree := $(abs_srctree) 241 endif 242 building_out_of_srctree := 1 243endif 244 245ifneq ($(KBUILD_ABS_SRCTREE),) 246srctree := $(abs_srctree) 247endif 248 249objtree := . 250 251VPATH := 252 253ifeq ($(KBUILD_EXTMOD),) 254ifdef building_out_of_srctree 255VPATH := $(srctree) 256endif 257endif 258 259export building_out_of_srctree srctree objtree VPATH 260 261# To make sure we do not include .config for any of the *config targets 262# catch them early, and hand them over to scripts/kconfig/Makefile 263# It is allowed to specify more targets when calling make, including 264# mixing *config targets and build targets. 265# For example 'make oldconfig all'. 266# Detect when mixed targets is specified, and make a second invocation 267# of make so .config is not included in this case either (for *config). 268 269version_h := include/generated/uapi/linux/version.h 270 271clean-targets := %clean mrproper cleandocs 272no-dot-config-targets := $(clean-targets) \ 273 cscope gtags TAGS tags help% %docs check% coccicheck \ 274 $(version_h) headers headers_% archheaders archscripts \ 275 %asm-generic kernelversion %src-pkg dt_binding_check \ 276 outputmakefile rustavailable rustfmt rustfmtcheck 277no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 278 image_name 279single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 280 281config-build := 282mixed-build := 283need-config := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 may-sync-config := 296 endif 297endif 298 299need-compiler := $(may-sync-config) 300 301ifneq ($(KBUILD_EXTMOD),) 302 may-sync-config := 303endif 304 305ifeq ($(KBUILD_EXTMOD),) 306 ifneq ($(filter %config,$(MAKECMDGOALS)),) 307 config-build := 1 308 ifneq ($(words $(MAKECMDGOALS)),1) 309 mixed-build := 1 310 endif 311 endif 312endif 313 314# We cannot build single targets and the others at the same time 315ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 316 single-build := 1 317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 318 mixed-build := 1 319 endif 320endif 321 322# For "make -j clean all", "make -j mrproper defconfig all", etc. 323ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 325 mixed-build := 1 326 endif 327endif 328 329# install and modules_install need also be processed one by one 330ifneq ($(filter install,$(MAKECMDGOALS)),) 331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 332 mixed-build := 1 333 endif 334endif 335 336ifdef mixed-build 337# =========================================================================== 338# We're called with mixed targets (*config and build targets). 339# Handle them one by one. 340 341PHONY += $(MAKECMDGOALS) __build_one_by_one 342 343$(MAKECMDGOALS): __build_one_by_one 344 @: 345 346__build_one_by_one: 347 $(Q)set -e; \ 348 for i in $(MAKECMDGOALS); do \ 349 $(MAKE) -f $(srctree)/Makefile $$i; \ 350 done 351 352else # !mixed-build 353 354include $(srctree)/scripts/Kbuild.include 355 356# Read KERNELRELEASE from include/config/kernel.release (if it exists) 357KERNELRELEASE = $(call read-file, include/config/kernel.release) 358KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 359export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 360 361include $(srctree)/scripts/subarch.include 362 363# Cross compiling and selecting different set of gcc/bin-utils 364# --------------------------------------------------------------------------- 365# 366# When performing cross compilation for other architectures ARCH shall be set 367# to the target architecture. (See arch/* for the possibilities). 368# ARCH can be set during invocation of make: 369# make ARCH=arm64 370# Another way is to have ARCH set in the environment. 371# The default ARCH is the host where make is executed. 372 373# CROSS_COMPILE specify the prefix used for all executables used 374# during compilation. Only gcc and related bin-utils executables 375# are prefixed with $(CROSS_COMPILE). 376# CROSS_COMPILE can be set on the command line 377# make CROSS_COMPILE=aarch64-linux-gnu- 378# Alternatively CROSS_COMPILE can be set in the environment. 379# Default value for CROSS_COMPILE is not to prefix executables 380# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 381ARCH ?= $(SUBARCH) 382 383# Architecture as present in compile.h 384UTS_MACHINE := $(ARCH) 385SRCARCH := $(ARCH) 386 387# Additional ARCH settings for x86 388ifeq ($(ARCH),i386) 389 SRCARCH := x86 390endif 391ifeq ($(ARCH),x86_64) 392 SRCARCH := x86 393endif 394 395# Additional ARCH settings for sparc 396ifeq ($(ARCH),sparc32) 397 SRCARCH := sparc 398endif 399ifeq ($(ARCH),sparc64) 400 SRCARCH := sparc 401endif 402 403# Additional ARCH settings for parisc 404ifeq ($(ARCH),parisc64) 405 SRCARCH := parisc 406endif 407 408export cross_compiling := 409ifneq ($(SRCARCH),$(SUBARCH)) 410cross_compiling := 1 411endif 412 413KCONFIG_CONFIG ?= .config 414export KCONFIG_CONFIG 415 416# SHELL used by kbuild 417CONFIG_SHELL := sh 418 419HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 420HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 421HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 422 423ifneq ($(LLVM),) 424ifneq ($(filter %/,$(LLVM)),) 425LLVM_PREFIX := $(LLVM) 426else ifneq ($(filter -%,$(LLVM)),) 427LLVM_SUFFIX := $(LLVM) 428endif 429 430HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 431HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 432else 433HOSTCC = gcc 434HOSTCXX = g++ 435endif 436HOSTRUSTC = rustc 437HOSTPKG_CONFIG = pkg-config 438 439KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 440 -O2 -fomit-frame-pointer -std=gnu11 441KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 442KBUILD_USERLDFLAGS := $(USERLDFLAGS) 443 444# These flags apply to all Rust code in the tree, including the kernel and 445# host programs. 446export rust_common_flags := --edition=2021 \ 447 -Zbinary_dep_depinfo=y \ 448 -Dunsafe_op_in_unsafe_fn \ 449 -Dnon_ascii_idents \ 450 -Wrust_2018_idioms \ 451 -Wunreachable_pub \ 452 -Wmissing_docs \ 453 -Wrustdoc::missing_crate_level_docs \ 454 -Wclippy::all \ 455 -Wclippy::mut_mut \ 456 -Wclippy::needless_bitwise_bool \ 457 -Wclippy::needless_continue \ 458 -Wclippy::no_mangle_with_rust_abi \ 459 -Wclippy::dbg_macro 460 461KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 462 $(HOSTCFLAGS) -I $(srctree)/scripts/include 463KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 464 -I $(srctree)/scripts/include 465KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 466 -Zallow-features= $(HOSTRUSTFLAGS) 467KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 468KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 469 470# Make variables (CC, etc...) 471CPP = $(CC) -E 472ifneq ($(LLVM),) 473CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 474LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 475AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 476NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 477OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 478OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 479READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 480STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 481else 482CC = $(CROSS_COMPILE)gcc 483LD = $(CROSS_COMPILE)ld 484AR = $(CROSS_COMPILE)ar 485NM = $(CROSS_COMPILE)nm 486OBJCOPY = $(CROSS_COMPILE)objcopy 487OBJDUMP = $(CROSS_COMPILE)objdump 488READELF = $(CROSS_COMPILE)readelf 489STRIP = $(CROSS_COMPILE)strip 490endif 491RUSTC = rustc 492RUSTDOC = rustdoc 493RUSTFMT = rustfmt 494CLIPPY_DRIVER = clippy-driver 495BINDGEN = bindgen 496PAHOLE = pahole 497RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 498LEX = flex 499YACC = bison 500AWK = awk 501INSTALLKERNEL := installkernel 502PERL = perl 503PYTHON3 = python3 504CHECK = sparse 505BASH = bash 506KGZIP = gzip 507KBZIP2 = bzip2 508KLZOP = lzop 509LZMA = lzma 510LZ4 = lz4c 511XZ = xz 512ZSTD = zstd 513 514CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 515 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 516NOSTDINC_FLAGS := 517CFLAGS_MODULE = 518RUSTFLAGS_MODULE = 519AFLAGS_MODULE = 520LDFLAGS_MODULE = 521CFLAGS_KERNEL = 522RUSTFLAGS_KERNEL = 523AFLAGS_KERNEL = 524LDFLAGS_vmlinux = 525 526# Use USERINCLUDE when you must reference the UAPI directories only. 527USERINCLUDE := \ 528 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 529 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 530 -I$(srctree)/include/uapi \ 531 -I$(objtree)/include/generated/uapi \ 532 -include $(srctree)/include/linux/compiler-version.h \ 533 -include $(srctree)/include/linux/kconfig.h 534 535# Use LINUXINCLUDE when you must reference the include/ directory. 536# Needed to be compatible with the O= option 537LINUXINCLUDE := \ 538 -I$(srctree)/arch/$(SRCARCH)/include \ 539 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 540 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 541 -I$(objtree)/include \ 542 $(USERINCLUDE) 543 544KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 545 546KBUILD_CFLAGS := 547KBUILD_CFLAGS += -std=gnu11 548KBUILD_CFLAGS += -fshort-wchar 549KBUILD_CFLAGS += -funsigned-char 550KBUILD_CFLAGS += -fno-common 551KBUILD_CFLAGS += -fno-PIE 552KBUILD_CFLAGS += -fno-strict-aliasing 553 554KBUILD_CPPFLAGS := -D__KERNEL__ 555KBUILD_RUSTFLAGS := $(rust_common_flags) \ 556 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 557 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 558 -Csymbol-mangling-version=v0 \ 559 -Crelocation-model=static \ 560 -Zfunction-sections=n \ 561 -Wclippy::float_arithmetic 562 563KBUILD_AFLAGS_KERNEL := 564KBUILD_CFLAGS_KERNEL := 565KBUILD_RUSTFLAGS_KERNEL := 566KBUILD_AFLAGS_MODULE := -DMODULE 567KBUILD_CFLAGS_MODULE := -DMODULE 568KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 569KBUILD_LDFLAGS_MODULE := 570KBUILD_LDFLAGS := 571CLANG_FLAGS := 572 573ifeq ($(KBUILD_CLIPPY),1) 574 RUSTC_OR_CLIPPY_QUIET := CLIPPY 575 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 576else 577 RUSTC_OR_CLIPPY_QUIET := RUSTC 578 RUSTC_OR_CLIPPY = $(RUSTC) 579endif 580 581ifdef RUST_LIB_SRC 582 export RUST_LIB_SRC 583endif 584 585# Allows the usage of unstable features in stable compilers. 586export RUSTC_BOOTSTRAP := 1 587 588export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 589export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 590export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 591export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 592export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 593export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 594export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 595export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 596 597export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 598export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 599export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 600export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 601export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 602export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 603 604# Files to ignore in find ... statements 605 606export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 607 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 608 -prune -o 609 610# =========================================================================== 611# Rules shared between *config targets and build targets 612 613# Basic helpers built in scripts/basic/ 614PHONY += scripts_basic 615scripts_basic: 616 $(Q)$(MAKE) $(build)=scripts/basic 617 618PHONY += outputmakefile 619ifdef building_out_of_srctree 620# Before starting out-of-tree build, make sure the source tree is clean. 621# outputmakefile generates a Makefile in the output directory, if using a 622# separate output directory. This allows convenient use of make in the 623# output directory. 624# At the same time when output Makefile generated, generate .gitignore to 625# ignore whole output directory 626 627quiet_cmd_makefile = GEN Makefile 628 cmd_makefile = { \ 629 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 630 echo "include $(srctree)/Makefile"; \ 631 } > Makefile 632 633outputmakefile: 634 @if [ -f $(srctree)/.config -o \ 635 -d $(srctree)/include/config -o \ 636 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 637 echo >&2 "***"; \ 638 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 639 echo >&2 "*** in $(abs_srctree)";\ 640 echo >&2 "***"; \ 641 false; \ 642 fi 643 $(Q)ln -fsn $(srctree) source 644 $(call cmd,makefile) 645 $(Q)test -e .gitignore || \ 646 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 647endif 648 649# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 650# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 651# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 652# need export), and from include/config/auto.conf.cmd to detect the compiler 653# upgrade. 654CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 655RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 656 657ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 658include $(srctree)/scripts/Makefile.clang 659endif 660 661# Include this also for config targets because some architectures need 662# cc-cross-prefix to determine CROSS_COMPILE. 663ifdef need-compiler 664include $(srctree)/scripts/Makefile.compiler 665endif 666 667ifdef config-build 668# =========================================================================== 669# *config targets only - make sure prerequisites are updated, and descend 670# in scripts/kconfig to make the *config target 671 672# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 673# KBUILD_DEFCONFIG may point out an alternative default configuration 674# used for 'make defconfig' 675include $(srctree)/arch/$(SRCARCH)/Makefile 676export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 677 678config: outputmakefile scripts_basic FORCE 679 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 680 681%config: outputmakefile scripts_basic FORCE 682 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 683 684else #!config-build 685# =========================================================================== 686# Build targets only - this includes vmlinux, arch-specific targets, clean 687# targets and others. In general all targets except *config targets. 688 689# If building an external module we do not care about the all: rule 690# but instead __all depend on modules 691PHONY += all 692ifeq ($(KBUILD_EXTMOD),) 693__all: all 694else 695__all: modules 696endif 697 698targets := 699 700# Decide whether to build built-in, modular, or both. 701# Normally, just do built-in. 702 703KBUILD_MODULES := 704KBUILD_BUILTIN := 1 705 706# If we have only "make modules", don't compile built-in objects. 707ifeq ($(MAKECMDGOALS),modules) 708 KBUILD_BUILTIN := 709endif 710 711# If we have "make <whatever> modules", compile modules 712# in addition to whatever we do anyway. 713# Just "make" or "make all" shall build modules as well 714 715ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 716 KBUILD_MODULES := 1 717endif 718 719ifeq ($(MAKECMDGOALS),) 720 KBUILD_MODULES := 1 721endif 722 723export KBUILD_MODULES KBUILD_BUILTIN 724 725ifdef need-config 726include include/config/auto.conf 727endif 728 729ifeq ($(KBUILD_EXTMOD),) 730# Objects we will link into vmlinux / subdirs we need to visit 731core-y := 732drivers-y := 733libs-y := lib/ 734endif # KBUILD_EXTMOD 735 736# The all: target is the default when no target is given on the 737# command line. 738# This allow a user to issue only 'make' to build a kernel including modules 739# Defaults to vmlinux, but the arch makefile usually adds further targets 740all: vmlinux 741 742CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 743ifdef CONFIG_CC_IS_GCC 744CFLAGS_GCOV += -fno-tree-loop-im 745endif 746export CFLAGS_GCOV 747 748# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 749ifdef CONFIG_FUNCTION_TRACER 750 CC_FLAGS_FTRACE := -pg 751endif 752 753include $(srctree)/arch/$(SRCARCH)/Makefile 754 755ifdef need-config 756ifdef may-sync-config 757# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 758# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 759# because some architectures define CROSS_COMPILE there. 760include include/config/auto.conf.cmd 761 762$(KCONFIG_CONFIG): 763 @echo >&2 '***' 764 @echo >&2 '*** Configuration file "$@" not found!' 765 @echo >&2 '***' 766 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 767 @echo >&2 '*** "make menuconfig" or "make xconfig").' 768 @echo >&2 '***' 769 @/bin/false 770 771# The actual configuration files used during the build are stored in 772# include/generated/ and include/config/. Update them if .config is newer than 773# include/config/auto.conf (which mirrors .config). 774# 775# This exploits the 'multi-target pattern rule' trick. 776# The syncconfig should be executed only once to make all the targets. 777# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 778# 779# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 780# so you cannot notice that Kconfig is waiting for the user input. 781%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 782 $(Q)$(kecho) " SYNC $@" 783 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 784else # !may-sync-config 785# External modules and some install targets need include/generated/autoconf.h 786# and include/config/auto.conf but do not care if they are up-to-date. 787# Use auto.conf to trigger the test 788PHONY += include/config/auto.conf 789 790include/config/auto.conf: 791 @test -e include/generated/autoconf.h -a -e $@ || ( \ 792 echo >&2; \ 793 echo >&2 " ERROR: Kernel configuration is invalid."; \ 794 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 795 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 796 echo >&2 ; \ 797 /bin/false) 798 799endif # may-sync-config 800endif # need-config 801 802KBUILD_CFLAGS += -fno-delete-null-pointer-checks 803 804ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 805KBUILD_CFLAGS += -O2 806KBUILD_RUSTFLAGS += -Copt-level=2 807else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 808KBUILD_CFLAGS += -Os 809KBUILD_RUSTFLAGS += -Copt-level=s 810endif 811 812# Always set `debug-assertions` and `overflow-checks` because their default 813# depends on `opt-level` and `debug-assertions`, respectively. 814KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 815KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 816 817# Tell gcc to never replace conditional load with a non-conditional one 818ifdef CONFIG_CC_IS_GCC 819# gcc-10 renamed --param=allow-store-data-races=0 to 820# -fno-allow-store-data-races. 821KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 822KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 823endif 824 825ifdef CONFIG_READABLE_ASM 826# Disable optimizations that make assembler listings hard to read. 827# reorder blocks reorders the control in the function 828# ipa clone creates specialized cloned functions 829# partial inlining inlines only parts of functions 830KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 831endif 832 833stackp-flags-y := -fno-stack-protector 834stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 835stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 836 837KBUILD_CFLAGS += $(stackp-flags-y) 838 839KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 840KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 841 842ifdef CONFIG_FRAME_POINTER 843KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 844KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 845else 846# Some targets (ARM with Thumb2, for example), can't be built with frame 847# pointers. For those, we don't have FUNCTION_TRACER automatically 848# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 849# incompatible with -fomit-frame-pointer with current GCC, so we don't use 850# -fomit-frame-pointer with FUNCTION_TRACER. 851# In the Rust target specification, "frame-pointer" is set explicitly 852# to "may-omit". 853ifndef CONFIG_FUNCTION_TRACER 854KBUILD_CFLAGS += -fomit-frame-pointer 855endif 856endif 857 858# Initialize all stack variables with a 0xAA pattern. 859ifdef CONFIG_INIT_STACK_ALL_PATTERN 860KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 861endif 862 863# Initialize all stack variables with a zero value. 864ifdef CONFIG_INIT_STACK_ALL_ZERO 865KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 866ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 867# https://github.com/llvm/llvm-project/issues/44842 868CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 869export CC_AUTO_VAR_INIT_ZERO_ENABLER 870KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 871endif 872endif 873 874# While VLAs have been removed, GCC produces unreachable stack probes 875# for the randomize_kstack_offset feature. Disable it for all compilers. 876KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 877 878# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 879ifdef CONFIG_ZERO_CALL_USED_REGS 880KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 881endif 882 883ifdef CONFIG_FUNCTION_TRACER 884ifdef CONFIG_FTRACE_MCOUNT_USE_CC 885 CC_FLAGS_FTRACE += -mrecord-mcount 886 ifdef CONFIG_HAVE_NOP_MCOUNT 887 ifeq ($(call cc-option-yn, -mnop-mcount),y) 888 CC_FLAGS_FTRACE += -mnop-mcount 889 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 890 endif 891 endif 892endif 893ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 894 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 895 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 896 endif 897endif 898ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 899 ifdef CONFIG_HAVE_C_RECORDMCOUNT 900 BUILD_C_RECORDMCOUNT := y 901 export BUILD_C_RECORDMCOUNT 902 endif 903endif 904ifdef CONFIG_HAVE_FENTRY 905 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 906 ifeq ($(call cc-option-yn, -mfentry),y) 907 CC_FLAGS_FTRACE += -mfentry 908 CC_FLAGS_USING += -DCC_USING_FENTRY 909 endif 910endif 911export CC_FLAGS_FTRACE 912KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 913KBUILD_AFLAGS += $(CC_FLAGS_USING) 914endif 915 916# We trigger additional mismatches with less inlining 917ifdef CONFIG_DEBUG_SECTION_MISMATCH 918KBUILD_CFLAGS += -fno-inline-functions-called-once 919endif 920 921# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 922ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 923KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 924KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 925LDFLAGS_vmlinux += --gc-sections 926endif 927 928ifdef CONFIG_SHADOW_CALL_STACK 929ifndef CONFIG_DYNAMIC_SCS 930CC_FLAGS_SCS := -fsanitize=shadow-call-stack 931KBUILD_CFLAGS += $(CC_FLAGS_SCS) 932KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 933endif 934export CC_FLAGS_SCS 935endif 936 937ifdef CONFIG_LTO_CLANG 938ifdef CONFIG_LTO_CLANG_THIN 939CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 940else 941CC_FLAGS_LTO := -flto 942endif 943CC_FLAGS_LTO += -fvisibility=hidden 944 945# Limit inlining across translation units to reduce binary size 946KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 947endif 948 949ifdef CONFIG_LTO 950KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 951KBUILD_AFLAGS += -fno-lto 952export CC_FLAGS_LTO 953endif 954 955ifdef CONFIG_CFI_CLANG 956CC_FLAGS_CFI := -fsanitize=kcfi 957ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 958 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 959endif 960ifdef CONFIG_RUST 961 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 962 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 963 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 964 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 965 export RUSTC_FLAGS_CFI 966endif 967KBUILD_CFLAGS += $(CC_FLAGS_CFI) 968export CC_FLAGS_CFI 969endif 970 971# Architectures can define flags to add/remove for floating-point support 972CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 973export CC_FLAGS_FPU 974export CC_FLAGS_NO_FPU 975 976ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 977# Set the minimal function alignment. Use the newer GCC option 978# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 979# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 980ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 981KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 982else 983KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 984endif 985endif 986 987# arch Makefile may override CC so keep this after arch Makefile is included 988NOSTDINC_FLAGS += -nostdinc 989 990# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 991# the kernel uses only C99 flexible arrays for dynamically sized trailing 992# arrays. Enforce this for everything that may examine structure sizes and 993# perform bounds checking. 994KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 995 996#Currently, disable -Wstringop-overflow for GCC 11, globally. 997KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 998KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 999 1000# disable invalid "can't wrap" optimizations for signed / pointers 1001KBUILD_CFLAGS += -fno-strict-overflow 1002 1003# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1004KBUILD_CFLAGS += -fno-stack-check 1005 1006# conserve stack if available 1007ifdef CONFIG_CC_IS_GCC 1008KBUILD_CFLAGS += -fconserve-stack 1009endif 1010 1011# change __FILE__ to the relative path from the srctree 1012KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1013 1014# include additional Makefiles when needed 1015include-y := scripts/Makefile.extrawarn 1016include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1017include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1018include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1019include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1020include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1021include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1022include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1023include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1024include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1025 1026include $(addprefix $(srctree)/, $(include-y)) 1027 1028# scripts/Makefile.gcc-plugins is intentionally included last. 1029# Do not add $(call cc-option,...) below this line. When you build the kernel 1030# from the clean source tree, the GCC plugins do not exist at this point. 1031 1032# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1033KBUILD_CPPFLAGS += $(KCPPFLAGS) 1034KBUILD_AFLAGS += $(KAFLAGS) 1035KBUILD_CFLAGS += $(KCFLAGS) 1036KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1037 1038KBUILD_LDFLAGS_MODULE += --build-id=sha1 1039LDFLAGS_vmlinux += --build-id=sha1 1040 1041KBUILD_LDFLAGS += -z noexecstack 1042ifeq ($(CONFIG_LD_IS_BFD),y) 1043KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1044endif 1045 1046ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1047LDFLAGS_vmlinux += -X 1048endif 1049 1050ifeq ($(CONFIG_RELR),y) 1051# ld.lld before 15 did not support -z pack-relative-relocs. 1052LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1053endif 1054 1055# We never want expected sections to be placed heuristically by the 1056# linker. All sections should be explicitly named in the linker script. 1057ifdef CONFIG_LD_ORPHAN_WARN 1058LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1059endif 1060 1061# Align the bit size of userspace programs with the kernel 1062KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1063KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1064 1065# make the checker run with the right architecture 1066CHECKFLAGS += --arch=$(ARCH) 1067 1068# insure the checker run with the right endianness 1069CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1070 1071# the checker needs the correct machine size 1072CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1073 1074# Default kernel image to build when no specific target is given. 1075# KBUILD_IMAGE may be overruled on the command line or 1076# set in the environment 1077# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1078# this default value 1079export KBUILD_IMAGE ?= vmlinux 1080 1081# 1082# INSTALL_PATH specifies where to place the updated kernel and system map 1083# images. Default is /boot, but you can set it to other values 1084export INSTALL_PATH ?= /boot 1085 1086# 1087# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1088# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1089# an argument if needed. Otherwise it defaults to the kernel install path 1090# 1091export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1092 1093# 1094# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1095# relocations required by build roots. This is not defined in the 1096# makefile but the argument can be passed to make if needed. 1097# 1098 1099MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1100export MODLIB 1101 1102PHONY += prepare0 1103 1104export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1105export MODORDER := $(extmod_prefix)modules.order 1106export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1107 1108ifeq ($(KBUILD_EXTMOD),) 1109 1110build-dir := . 1111clean-dirs := $(sort . Documentation \ 1112 $(patsubst %/,%,$(filter %/, $(core-) \ 1113 $(drivers-) $(libs-)))) 1114 1115export ARCH_CORE := $(core-y) 1116export ARCH_LIB := $(filter %/, $(libs-y)) 1117export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1118# Externally visible symbols (used by link-vmlinux.sh) 1119 1120KBUILD_VMLINUX_OBJS := ./built-in.a 1121ifdef CONFIG_MODULES 1122KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1123KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1124else 1125KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1126endif 1127 1128export KBUILD_VMLINUX_LIBS 1129export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1130 1131ifdef CONFIG_TRIM_UNUSED_KSYMS 1132# For the kernel to actually contain only the needed exported symbols, 1133# we have to build modules as well to determine what those symbols are. 1134KBUILD_MODULES := 1 1135endif 1136 1137# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1138quiet_cmd_ar_vmlinux.a = AR $@ 1139 cmd_ar_vmlinux.a = \ 1140 rm -f $@; \ 1141 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1142 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1143 1144targets += vmlinux.a 1145vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1146 $(call if_changed,ar_vmlinux.a) 1147 1148PHONY += vmlinux_o 1149vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1150 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1151 1152vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1153 @: 1154 1155PHONY += vmlinux 1156# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1157# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1158# unrelated; the decompressors just happen to have the same base name, 1159# arch/*/boot/compressed/vmlinux. 1160# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1161# 1162# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1163# https://savannah.gnu.org/bugs/?61463 1164# For Make > 4.4, the following simple code will work: 1165# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1166vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1167vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1168vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1169 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1170 1171# The actual objects are generated when descending, 1172# make sure no implicit rule kicks in 1173$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1174 1175ifeq ($(origin KERNELRELEASE),file) 1176filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1177else 1178filechk_kernel.release = echo $(KERNELRELEASE) 1179endif 1180 1181# Store (new) KERNELRELEASE string in include/config/kernel.release 1182include/config/kernel.release: FORCE 1183 $(call filechk,kernel.release) 1184 1185# Additional helpers built in scripts/ 1186# Carefully list dependencies so we do not try to build scripts twice 1187# in parallel 1188PHONY += scripts 1189scripts: scripts_basic scripts_dtc 1190 $(Q)$(MAKE) $(build)=$(@) 1191 1192# Things we need to do before we recursively start building the kernel 1193# or the modules are listed in "prepare". 1194# A multi level approach is used. prepareN is processed before prepareN-1. 1195# archprepare is used in arch Makefiles and when processed asm symlink, 1196# version.h and scripts_basic is processed / created. 1197 1198PHONY += prepare archprepare 1199 1200archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1201 asm-generic $(version_h) include/generated/utsrelease.h \ 1202 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1203 1204prepare0: archprepare 1205 $(Q)$(MAKE) $(build)=scripts/mod 1206 $(Q)$(MAKE) $(build)=. prepare 1207 1208# All the preparing.. 1209prepare: prepare0 1210ifdef CONFIG_RUST 1211 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1212 $(Q)$(MAKE) $(build)=rust 1213endif 1214 1215PHONY += remove-stale-files 1216remove-stale-files: 1217 $(Q)$(srctree)/scripts/remove-stale-files 1218 1219# Support for using generic headers in asm-generic 1220asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1221 1222PHONY += asm-generic uapi-asm-generic 1223asm-generic: uapi-asm-generic 1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1225 generic=include/asm-generic 1226uapi-asm-generic: 1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1228 generic=include/uapi/asm-generic 1229 1230# Generate some files 1231# --------------------------------------------------------------------------- 1232 1233# KERNELRELEASE can change from a few different places, meaning version.h 1234# needs to be updated, so this check is forced on all builds 1235 1236uts_len := 64 1237define filechk_utsrelease.h 1238 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1239 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1240 exit 1; \ 1241 fi; \ 1242 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1243endef 1244 1245define filechk_version.h 1246 if [ $(SUBLEVEL) -gt 255 ]; then \ 1247 echo \#define LINUX_VERSION_CODE $(shell \ 1248 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1249 else \ 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1252 fi; \ 1253 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1254 ((c) > 255 ? 255 : (c)))'; \ 1255 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1256 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1257 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1258endef 1259 1260$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1261$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1262$(version_h): FORCE 1263 $(call filechk,version.h) 1264 1265include/generated/utsrelease.h: include/config/kernel.release FORCE 1266 $(call filechk,utsrelease.h) 1267 1268filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1269 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1270 1271include/generated/compile.h: FORCE 1272 $(call filechk,compile.h) 1273 1274PHONY += headerdep 1275headerdep: 1276 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1277 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1278 1279# --------------------------------------------------------------------------- 1280# Kernel headers 1281 1282#Default location for installed headers 1283export INSTALL_HDR_PATH = $(objtree)/usr 1284 1285quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1286 cmd_headers_install = \ 1287 mkdir -p $(INSTALL_HDR_PATH); \ 1288 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1289 usr/include $(INSTALL_HDR_PATH) 1290 1291PHONY += headers_install 1292headers_install: headers 1293 $(call cmd,headers_install) 1294 1295PHONY += archheaders archscripts 1296 1297hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1298 1299PHONY += headers 1300headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1301 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1302 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1303 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1304 1305ifdef CONFIG_HEADERS_INSTALL 1306prepare: headers 1307endif 1308 1309PHONY += scripts_unifdef 1310scripts_unifdef: scripts_basic 1311 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1312 1313# --------------------------------------------------------------------------- 1314# Install 1315 1316# Many distributions have the custom install script, /sbin/installkernel. 1317# If DKMS is installed, 'make install' will eventually recurse back 1318# to this Makefile to build and install external modules. 1319# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1320 1321quiet_cmd_install = INSTALL $(INSTALL_PATH) 1322 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1323 1324# --------------------------------------------------------------------------- 1325# vDSO install 1326 1327PHONY += vdso_install 1328vdso_install: export INSTALL_FILES = $(vdso-install-y) 1329vdso_install: 1330 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1331 1332# --------------------------------------------------------------------------- 1333# Tools 1334 1335ifdef CONFIG_OBJTOOL 1336prepare: tools/objtool 1337endif 1338 1339ifdef CONFIG_BPF 1340ifdef CONFIG_DEBUG_INFO_BTF 1341prepare: tools/bpf/resolve_btfids 1342endif 1343endif 1344 1345# The tools build system is not a part of Kbuild and tends to introduce 1346# its own unique issues. If you need to integrate a new tool into Kbuild, 1347# please consider locating that tool outside the tools/ tree and using the 1348# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1349# here. See Documentation/kbuild/makefiles.rst for details. 1350 1351PHONY += resolve_btfids_clean 1352 1353resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1354 1355# tools/bpf/resolve_btfids directory might not exist 1356# in output directory, skip its clean in that case 1357resolve_btfids_clean: 1358ifneq ($(wildcard $(resolve_btfids_O)),) 1359 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1360endif 1361 1362# Clear a bunch of variables before executing the submake 1363ifeq ($(quiet),silent_) 1364tools_silent=s 1365endif 1366 1367tools/: FORCE 1368 $(Q)mkdir -p $(objtree)/tools 1369 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1370 1371tools/%: FORCE 1372 $(Q)mkdir -p $(objtree)/tools 1373 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1374 1375# --------------------------------------------------------------------------- 1376# Kernel selftest 1377 1378PHONY += kselftest 1379kselftest: headers 1380 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1381 1382kselftest-%: headers FORCE 1383 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1384 1385PHONY += kselftest-merge 1386kselftest-merge: 1387 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1388 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1389 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1390 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1391 1392# --------------------------------------------------------------------------- 1393# Devicetree files 1394 1395ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1396dtstree := arch/$(SRCARCH)/boot/dts 1397endif 1398 1399ifneq ($(dtstree),) 1400 1401%.dtb: dtbs_prepare 1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1403 1404%.dtbo: dtbs_prepare 1405 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1406 1407PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1408dtbs: dtbs_prepare 1409 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1410 1411# include/config/kernel.release is actually needed when installing DTBs because 1412# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1413# dtbs_install depend on it as dtbs_install may run as root. 1414dtbs_prepare: include/config/kernel.release scripts_dtc 1415 1416ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1417export CHECK_DTBS=y 1418endif 1419 1420ifneq ($(CHECK_DTBS),) 1421dtbs_prepare: dt_binding_schemas 1422endif 1423 1424dtbs_check: dtbs 1425 1426dtbs_install: 1427 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1428 1429ifdef CONFIG_OF_EARLY_FLATTREE 1430all: dtbs 1431endif 1432 1433endif 1434 1435PHONY += scripts_dtc 1436scripts_dtc: scripts_basic 1437 $(Q)$(MAKE) $(build)=scripts/dtc 1438 1439ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1440export CHECK_DTBS=y 1441endif 1442 1443PHONY += dt_binding_check dt_binding_schemas 1444dt_binding_check: dt_binding_schemas scripts_dtc 1445 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1446 1447dt_binding_schemas: 1448 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1449 1450PHONY += dt_compatible_check 1451dt_compatible_check: dt_binding_schemas 1452 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1453 1454# --------------------------------------------------------------------------- 1455# Modules 1456 1457ifdef CONFIG_MODULES 1458 1459# By default, build modules as well 1460 1461all: modules 1462 1463# When we're building modules with modversions, we need to consider 1464# the built-in objects during the descend as well, in order to 1465# make sure the checksums are up to date before we record them. 1466ifdef CONFIG_MODVERSIONS 1467 KBUILD_BUILTIN := 1 1468endif 1469 1470# Build modules 1471# 1472 1473# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1474# is an exception. 1475ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1476KBUILD_BUILTIN := 1 1477modules: vmlinux 1478endif 1479 1480modules: modules_prepare 1481 1482# Target to prepare building external modules 1483modules_prepare: prepare 1484 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1485 1486endif # CONFIG_MODULES 1487 1488### 1489# Cleaning is done on three levels. 1490# make clean Delete most generated files 1491# Leave enough to build external modules 1492# make mrproper Delete the current configuration, and all generated files 1493# make distclean Remove editor backup files, patch leftover files and the like 1494 1495# Directories & files removed with 'make clean' 1496CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1497 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1498 compile_commands.json rust/test \ 1499 rust-project.json .vmlinux.objs .vmlinux.export.c 1500 1501# Directories & files removed with 'make mrproper' 1502MRPROPER_FILES += include/config include/generated \ 1503 arch/$(SRCARCH)/include/generated .objdiff \ 1504 debian snap tar-install PKGBUILD pacman \ 1505 .config .config.old .version \ 1506 Module.symvers \ 1507 certs/signing_key.pem \ 1508 certs/x509.genkey \ 1509 vmlinux-gdb.py \ 1510 rpmbuild \ 1511 rust/libmacros.so 1512 1513# clean - Delete most, but leave enough to build external modules 1514# 1515clean: private rm-files := $(CLEAN_FILES) 1516 1517PHONY += archclean vmlinuxclean 1518 1519vmlinuxclean: 1520 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1521 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1522 1523clean: archclean vmlinuxclean resolve_btfids_clean 1524 1525# mrproper - Delete all generated files, including .config 1526# 1527mrproper: private rm-files := $(MRPROPER_FILES) 1528mrproper-dirs := $(addprefix _mrproper_,scripts) 1529 1530PHONY += $(mrproper-dirs) mrproper 1531$(mrproper-dirs): 1532 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1533 1534mrproper: clean $(mrproper-dirs) 1535 $(call cmd,rmfiles) 1536 @find . $(RCS_FIND_IGNORE) \ 1537 \( -name '*.rmeta' \) \ 1538 -type f -print | xargs rm -f 1539 1540# distclean 1541# 1542PHONY += distclean 1543 1544distclean: mrproper 1545 @find . $(RCS_FIND_IGNORE) \ 1546 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1547 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1548 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1549 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1550 -type f -print | xargs rm -f 1551 1552 1553# Packaging of the kernel to various formats 1554# --------------------------------------------------------------------------- 1555 1556%src-pkg: FORCE 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1558%pkg: include/config/kernel.release FORCE 1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1560 1561# Brief documentation of the typical targets used 1562# --------------------------------------------------------------------------- 1563 1564boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1565boards := $(sort $(notdir $(boards))) 1566board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1567board-dirs := $(sort $(notdir $(board-dirs:/=))) 1568 1569PHONY += help 1570help: 1571 @echo 'Cleaning targets:' 1572 @echo ' clean - Remove most generated files but keep the config and' 1573 @echo ' enough build support to build external modules' 1574 @echo ' mrproper - Remove all generated files + config + various backup files' 1575 @echo ' distclean - mrproper + remove editor backup and patch files' 1576 @echo '' 1577 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1578 @echo '' 1579 @echo 'Other generic targets:' 1580 @echo ' all - Build all targets marked with [*]' 1581 @echo '* vmlinux - Build the bare kernel' 1582 @echo '* modules - Build all modules' 1583 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1584 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1585 @echo ' dir/ - Build all files in dir and below' 1586 @echo ' dir/file.[ois] - Build specified target only' 1587 @echo ' dir/file.ll - Build the LLVM assembly file' 1588 @echo ' (requires compiler support for LLVM assembly generation)' 1589 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1590 @echo ' (requires a recent binutils and recent build (System.map))' 1591 @echo ' dir/file.ko - Build module including final link' 1592 @echo ' modules_prepare - Set up for building external modules' 1593 @echo ' tags/TAGS - Generate tags file for editors' 1594 @echo ' cscope - Generate cscope index' 1595 @echo ' gtags - Generate GNU GLOBAL index' 1596 @echo ' kernelrelease - Output the release version string (use with make -s)' 1597 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1598 @echo ' image_name - Output the image name (use with make -s)' 1599 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1600 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1601 echo '' 1602 @echo 'Static analysers:' 1603 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1604 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1605 @echo ' versioncheck - Sanity check on version.h usage' 1606 @echo ' includecheck - Check for duplicate included header files' 1607 @echo ' export_report - List the usages of all exported symbols' 1608 @echo ' headerdep - Detect inclusion cycles in headers' 1609 @echo ' coccicheck - Check with Coccinelle' 1610 @echo ' clang-analyzer - Check with clang static analyzer' 1611 @echo ' clang-tidy - Check with clang-tidy' 1612 @echo '' 1613 @echo 'Tools:' 1614 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1615 @echo '' 1616 @echo 'Kernel selftest:' 1617 @echo ' kselftest - Build and run kernel selftest' 1618 @echo ' Build, install, and boot kernel before' 1619 @echo ' running kselftest on it' 1620 @echo ' Run as root for full coverage' 1621 @echo ' kselftest-all - Build kernel selftest' 1622 @echo ' kselftest-install - Build and install kernel selftest' 1623 @echo ' kselftest-clean - Remove all generated kselftest files' 1624 @echo ' kselftest-merge - Merge all the config dependencies of' 1625 @echo ' kselftest to existing .config.' 1626 @echo '' 1627 @echo 'Rust targets:' 1628 @echo ' rustavailable - Checks whether the Rust toolchain is' 1629 @echo ' available and, if not, explains why.' 1630 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1631 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1632 @echo ' is formatted, printing a diff otherwise.' 1633 @echo ' rustdoc - Generate Rust documentation' 1634 @echo ' (requires kernel .config)' 1635 @echo ' rusttest - Runs the Rust tests' 1636 @echo ' (requires kernel .config; downloads external repos)' 1637 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1638 @echo ' (requires kernel .config)' 1639 @echo ' dir/file.[os] - Build specified target only' 1640 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1641 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1642 @echo ' The output is not intended to be compilable.' 1643 @echo ' dir/file.ll - Build the LLVM assembly file' 1644 @echo '' 1645 @$(if $(dtstree), \ 1646 echo 'Devicetree:'; \ 1647 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1648 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1649 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1650 echo ' dt_binding_schema - Build processed device tree binding schemas'; \ 1651 echo ' dtbs_check - Validate device tree source files';\ 1652 echo '') 1653 1654 @echo 'Userspace tools targets:' 1655 @echo ' use "make tools/help"' 1656 @echo ' or "cd tools; make help"' 1657 @echo '' 1658 @echo 'Kernel packaging:' 1659 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1660 @echo '' 1661 @echo 'Documentation targets:' 1662 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1663 @echo '' 1664 @echo 'Architecture-specific targets ($(SRCARCH)):' 1665 @$(or $(archhelp),\ 1666 echo ' No architecture-specific help defined for $(SRCARCH)') 1667 @echo '' 1668 @$(if $(boards), \ 1669 $(foreach b, $(boards), \ 1670 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1671 echo '') 1672 @$(if $(board-dirs), \ 1673 $(foreach b, $(board-dirs), \ 1674 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1675 printf " %-16s - Show all of the above\\n" help-boards; \ 1676 echo '') 1677 1678 @echo ' make V=n [targets] 1: verbose build' 1679 @echo ' 2: give reason for rebuild of target' 1680 @echo ' V=1 and V=2 can be combined with V=12' 1681 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1682 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1683 @echo ' (sparse by default)' 1684 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1685 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1686 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1687 @echo ' 1: warnings which may be relevant and do not occur too often' 1688 @echo ' 2: warnings which occur quite often but may still be relevant' 1689 @echo ' 3: more obscure warnings, can most likely be ignored' 1690 @echo ' c: extra checks in the configuration stage (Kconfig)' 1691 @echo ' e: warnings are being treated as errors' 1692 @echo ' Multiple levels can be combined with W=12 or W=123' 1693 @$(if $(dtstree), \ 1694 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1695 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1696 ) 1697 @echo '' 1698 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1699 @echo 'For further info see the ./README file' 1700 1701 1702help-board-dirs := $(addprefix help-,$(board-dirs)) 1703 1704help-boards: $(help-board-dirs) 1705 1706boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1707 1708$(help-board-dirs): help-%: 1709 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1710 @$(if $(boards-per-dir), \ 1711 $(foreach b, $(boards-per-dir), \ 1712 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1713 echo '') 1714 1715 1716# Documentation targets 1717# --------------------------------------------------------------------------- 1718DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1719 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1720PHONY += $(DOC_TARGETS) 1721$(DOC_TARGETS): 1722 $(Q)$(MAKE) $(build)=Documentation $@ 1723 1724 1725# Rust targets 1726# --------------------------------------------------------------------------- 1727 1728# "Is Rust available?" target 1729PHONY += rustavailable 1730rustavailable: 1731 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1732 1733# Documentation target 1734# 1735# Using the singular to avoid running afoul of `no-dot-config-targets`. 1736PHONY += rustdoc 1737rustdoc: prepare 1738 $(Q)$(MAKE) $(build)=rust $@ 1739 1740# Testing target 1741PHONY += rusttest 1742rusttest: prepare 1743 $(Q)$(MAKE) $(build)=rust $@ 1744 1745# Formatting targets 1746PHONY += rustfmt rustfmtcheck 1747 1748# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1749# 1750# We match using absolute paths since `find` does not resolve them 1751# when matching, which is a problem when e.g. `srctree` is `..`. 1752# We `grep` afterwards in order to remove the directory entry itself. 1753rustfmt: 1754 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1755 -o -path $(abs_srctree)/rust/alloc -prune \ 1756 -o -path $(abs_objtree)/rust/test -prune \ 1757 | grep -Fv $(abs_srctree)/rust/alloc \ 1758 | grep -Fv $(abs_objtree)/rust/test \ 1759 | grep -Fv generated \ 1760 | xargs $(RUSTFMT) $(rustfmt_flags) 1761 1762rustfmtcheck: rustfmt_flags = --check 1763rustfmtcheck: rustfmt 1764 1765# Misc 1766# --------------------------------------------------------------------------- 1767 1768PHONY += misc-check 1769misc-check: 1770 $(Q)$(srctree)/scripts/misc-check 1771 1772all: misc-check 1773 1774PHONY += scripts_gdb 1775scripts_gdb: prepare0 1776 $(Q)$(MAKE) $(build)=scripts/gdb 1777 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1778 1779ifdef CONFIG_GDB_SCRIPTS 1780all: scripts_gdb 1781endif 1782 1783else # KBUILD_EXTMOD 1784 1785filechk_kernel.release = echo $(KERNELRELEASE) 1786 1787### 1788# External module support. 1789# When building external modules the kernel used as basis is considered 1790# read-only, and no consistency checks are made and the make 1791# system is not used on the basis kernel. If updates are required 1792# in the basis kernel ordinary make commands (without M=...) must be used. 1793 1794# We are always building only modules. 1795KBUILD_BUILTIN := 1796KBUILD_MODULES := 1 1797 1798build-dir := $(KBUILD_EXTMOD) 1799 1800compile_commands.json: $(extmod_prefix)compile_commands.json 1801PHONY += compile_commands.json 1802 1803clean-dirs := $(KBUILD_EXTMOD) 1804clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1805 $(KBUILD_EXTMOD)/compile_commands.json 1806 1807PHONY += prepare 1808# now expand this into a simple variable to reduce the cost of shell evaluations 1809prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1810prepare: 1811 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1812 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1813 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1814 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1815 fi 1816 1817PHONY += help 1818help: 1819 @echo ' Building external modules.' 1820 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1821 @echo '' 1822 @echo ' modules - default target, build the module(s)' 1823 @echo ' modules_install - install the module' 1824 @echo ' clean - remove generated files in module directory only' 1825 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1826 @echo '' 1827 1828ifndef CONFIG_MODULES 1829modules modules_install: __external_modules_error 1830__external_modules_error: 1831 @echo >&2 '***' 1832 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1833 @echo >&2 '*** You cannot build or install external modules.' 1834 @echo >&2 '***' 1835 @false 1836endif 1837 1838endif # KBUILD_EXTMOD 1839 1840# --------------------------------------------------------------------------- 1841# Modules 1842 1843PHONY += modules modules_install modules_sign modules_prepare 1844 1845modules_install: 1846 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1847 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1848 1849ifeq ($(CONFIG_MODULE_SIG),y) 1850# modules_sign is a subset of modules_install. 1851# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1852modules_sign: modules_install 1853 @: 1854else 1855modules_sign: 1856 @echo >&2 '***' 1857 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1858 @echo >&2 '***' 1859 @false 1860endif 1861 1862ifdef CONFIG_MODULES 1863 1864$(MODORDER): $(build-dir) 1865 @: 1866 1867# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1868# This is solely useful to speed up test compiles. 1869modules: modpost 1870ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1871 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1872endif 1873 1874PHONY += modules_check 1875modules_check: $(MODORDER) 1876 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1877 1878else # CONFIG_MODULES 1879 1880modules: 1881 @: 1882 1883KBUILD_MODULES := 1884 1885endif # CONFIG_MODULES 1886 1887PHONY += modpost 1888modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1889 $(if $(KBUILD_MODULES), modules_check) 1890 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1891 1892# Single targets 1893# --------------------------------------------------------------------------- 1894# To build individual files in subdirectories, you can do like this: 1895# 1896# make foo/bar/baz.s 1897# 1898# The supported suffixes for single-target are listed in 'single-targets' 1899# 1900# To build only under specific subdirectories, you can do like this: 1901# 1902# make foo/bar/baz/ 1903 1904ifdef single-build 1905 1906# .ko is special because modpost is needed 1907single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1908single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1909 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1910 1911$(single-ko): single_modules 1912 @: 1913$(single-no-ko): $(build-dir) 1914 @: 1915 1916# Remove MODORDER when done because it is not the real one. 1917PHONY += single_modules 1918single_modules: $(single-no-ko) modules_prepare 1919 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1920 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1921ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1922 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1923endif 1924 $(Q)rm -f $(MODORDER) 1925 1926single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1927 1928KBUILD_MODULES := 1 1929 1930endif 1931 1932# Preset locale variables to speed up the build process. Limit locale 1933# tweaks to this spot to avoid wrong language settings when running 1934# make menuconfig etc. 1935# Error messages still appears in the original language 1936PHONY += $(build-dir) 1937$(build-dir): prepare 1938 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1939 1940clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1941PHONY += $(clean-dirs) clean 1942$(clean-dirs): 1943 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1944 1945clean: $(clean-dirs) 1946 $(call cmd,rmfiles) 1947 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1948 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1949 -o -name '*.ko.*' \ 1950 -o -name '*.dtb' -o -name '*.dtbo' \ 1951 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1952 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1953 -o -name '*.dwo' -o -name '*.lst' \ 1954 -o -name '*.su' -o -name '*.mod' \ 1955 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1956 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1957 -o -name '*.asn1.[ch]' \ 1958 -o -name '*.symtypes' -o -name 'modules.order' \ 1959 -o -name '*.c.[012]*.*' \ 1960 -o -name '*.ll' \ 1961 -o -name '*.gcno' \ 1962 -o -name '*.*.symversions' \) -type f -print \ 1963 -o -name '.tmp_*' -print \ 1964 | xargs rm -rf 1965 1966# Generate tags for editors 1967# --------------------------------------------------------------------------- 1968quiet_cmd_tags = GEN $@ 1969 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1970 1971tags TAGS cscope gtags: FORCE 1972 $(call cmd,tags) 1973 1974# Generate rust-project.json (a file that describes the structure of non-Cargo 1975# Rust projects) for rust-analyzer (an implementation of the Language Server 1976# Protocol). 1977PHONY += rust-analyzer 1978rust-analyzer: 1979 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1980 $(Q)$(MAKE) $(build)=rust $@ 1981 1982# Script to generate missing namespace dependencies 1983# --------------------------------------------------------------------------- 1984 1985PHONY += nsdeps 1986nsdeps: export KBUILD_NSDEPS=1 1987nsdeps: modules 1988 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1989 1990# Clang Tooling 1991# --------------------------------------------------------------------------- 1992 1993quiet_cmd_gen_compile_commands = GEN $@ 1994 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1995 1996$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1997 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1998 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1999 $(call if_changed,gen_compile_commands) 2000 2001targets += $(extmod_prefix)compile_commands.json 2002 2003PHONY += clang-tidy clang-analyzer 2004 2005ifdef CONFIG_CC_IS_CLANG 2006quiet_cmd_clang_tools = CHECK $< 2007 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2008 2009clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2010 $(call cmd,clang_tools) 2011else 2012clang-tidy clang-analyzer: 2013 @echo "$@ requires CC=clang" >&2 2014 @false 2015endif 2016 2017# Scripts to check various things for consistency 2018# --------------------------------------------------------------------------- 2019 2020PHONY += includecheck versioncheck coccicheck export_report 2021 2022includecheck: 2023 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2024 -name '*.[hcS]' -type f -print | sort \ 2025 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2026 2027versioncheck: 2028 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2029 -name '*.[hcS]' -type f -print | sort \ 2030 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2031 2032coccicheck: 2033 $(Q)$(BASH) $(srctree)/scripts/$@ 2034 2035export_report: 2036 $(PERL) $(srctree)/scripts/export_report.pl 2037 2038PHONY += checkstack kernelrelease kernelversion image_name 2039 2040# UML needs a little special treatment here. It wants to use the host 2041# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2042# else wants $(ARCH), including people doing cross-builds, which means 2043# that $(SUBARCH) doesn't work here. 2044ifeq ($(ARCH), um) 2045CHECKSTACK_ARCH := $(SUBARCH) 2046else 2047CHECKSTACK_ARCH := $(ARCH) 2048endif 2049MINSTACKSIZE ?= 100 2050checkstack: 2051 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2052 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2053 2054kernelrelease: 2055 @$(filechk_kernel.release) 2056 2057kernelversion: 2058 @echo $(KERNELVERSION) 2059 2060image_name: 2061 @echo $(KBUILD_IMAGE) 2062 2063PHONY += run-command 2064run-command: 2065 $(Q)$(KBUILD_RUN_COMMAND) 2066 2067quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2068 cmd_rmfiles = rm -rf $(rm-files) 2069 2070# read saved command lines for existing targets 2071existing-targets := $(wildcard $(sort $(targets))) 2072 2073-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2074 2075endif # config-build 2076endif # mixed-build 2077endif # need-sub-make 2078 2079PHONY += FORCE 2080FORCE: 2081 2082# Declare the contents of the PHONY variable as phony. We keep that 2083# information in a variable so we can use it in if_changed and friends. 2084.PHONY: $(PHONY) 2085