1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 19 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.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 := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 $(version_h) headers headers_% archheaders archscripts \ 297 %asm-generic kernelversion %src-pkg dt_binding_check \ 298 outputmakefile rustavailable rustfmt rustfmtcheck 299no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 300 image_name 301single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 302 303config-build := 304mixed-build := 305need-config := 1 306may-sync-config := 1 307single-build := 308 309ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 310 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 311 need-config := 312 endif 313endif 314 315ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 316 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 317 may-sync-config := 318 endif 319endif 320 321need-compiler := $(may-sync-config) 322 323ifneq ($(KBUILD_EXTMOD),) 324 may-sync-config := 325endif 326 327ifeq ($(KBUILD_EXTMOD),) 328 ifneq ($(filter %config,$(MAKECMDGOALS)),) 329 config-build := 1 330 ifneq ($(words $(MAKECMDGOALS)),1) 331 mixed-build := 1 332 endif 333 endif 334endif 335 336# We cannot build single targets and the others at the same time 337ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 338 single-build := 1 339 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 340 mixed-build := 1 341 endif 342endif 343 344# For "make -j clean all", "make -j mrproper defconfig all", etc. 345ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 346 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 347 mixed-build := 1 348 endif 349endif 350 351# install and modules_install need also be processed one by one 352ifneq ($(filter install,$(MAKECMDGOALS)),) 353 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 354 mixed-build := 1 355 endif 356endif 357 358ifdef mixed-build 359# =========================================================================== 360# We're called with mixed targets (*config and build targets). 361# Handle them one by one. 362 363PHONY += $(MAKECMDGOALS) __build_one_by_one 364 365$(MAKECMDGOALS): __build_one_by_one 366 @: 367 368__build_one_by_one: 369 $(Q)set -e; \ 370 for i in $(MAKECMDGOALS); do \ 371 $(MAKE) -f $(srctree)/Makefile $$i; \ 372 done 373 374else # !mixed-build 375 376include $(srctree)/scripts/Kbuild.include 377 378# Read KERNELRELEASE from include/config/kernel.release (if it exists) 379KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 380KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 381export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 382 383include $(srctree)/scripts/subarch.include 384 385# Cross compiling and selecting different set of gcc/bin-utils 386# --------------------------------------------------------------------------- 387# 388# When performing cross compilation for other architectures ARCH shall be set 389# to the target architecture. (See arch/* for the possibilities). 390# ARCH can be set during invocation of make: 391# make ARCH=arm64 392# Another way is to have ARCH set in the environment. 393# The default ARCH is the host where make is executed. 394 395# CROSS_COMPILE specify the prefix used for all executables used 396# during compilation. Only gcc and related bin-utils executables 397# are prefixed with $(CROSS_COMPILE). 398# CROSS_COMPILE can be set on the command line 399# make CROSS_COMPILE=aarch64-linux-gnu- 400# Alternatively CROSS_COMPILE can be set in the environment. 401# Default value for CROSS_COMPILE is not to prefix executables 402# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 403ARCH ?= $(SUBARCH) 404 405# Architecture as present in compile.h 406UTS_MACHINE := $(ARCH) 407SRCARCH := $(ARCH) 408 409# Additional ARCH settings for x86 410ifeq ($(ARCH),i386) 411 SRCARCH := x86 412endif 413ifeq ($(ARCH),x86_64) 414 SRCARCH := x86 415endif 416 417# Additional ARCH settings for sparc 418ifeq ($(ARCH),sparc32) 419 SRCARCH := sparc 420endif 421ifeq ($(ARCH),sparc64) 422 SRCARCH := sparc 423endif 424 425# Additional ARCH settings for parisc 426ifeq ($(ARCH),parisc64) 427 SRCARCH := parisc 428endif 429 430export cross_compiling := 431ifneq ($(SRCARCH),$(SUBARCH)) 432cross_compiling := 1 433endif 434 435KCONFIG_CONFIG ?= .config 436export KCONFIG_CONFIG 437 438# SHELL used by kbuild 439CONFIG_SHELL := sh 440 441HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 442HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 443HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 444 445ifneq ($(LLVM),) 446ifneq ($(filter %/,$(LLVM)),) 447LLVM_PREFIX := $(LLVM) 448else ifneq ($(filter -%,$(LLVM)),) 449LLVM_SUFFIX := $(LLVM) 450else ifneq ($(LLVM),1) 451$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 452endif 453 454HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 455HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 456else 457HOSTCC = gcc 458HOSTCXX = g++ 459endif 460HOSTRUSTC = rustc 461HOSTPKG_CONFIG = pkg-config 462 463# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 464# has a logic to call it 465KERNELDOC = $(srctree)/scripts/kernel-doc.py 466export KERNELDOC 467 468KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 469 -O2 -fomit-frame-pointer -std=gnu11 470KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 471KBUILD_USERLDFLAGS := $(USERLDFLAGS) 472 473# These flags apply to all Rust code in the tree, including the kernel and 474# host programs. 475export rust_common_flags := --edition=2021 \ 476 -Zbinary_dep_depinfo=y \ 477 -Astable_features \ 478 -Dnon_ascii_idents \ 479 -Dunsafe_op_in_unsafe_fn \ 480 -Wmissing_docs \ 481 -Wrust_2018_idioms \ 482 -Wunreachable_pub \ 483 -Wclippy::all \ 484 -Wclippy::as_ptr_cast_mut \ 485 -Wclippy::as_underscore \ 486 -Wclippy::cast_lossless \ 487 -Wclippy::ignored_unit_patterns \ 488 -Wclippy::mut_mut \ 489 -Wclippy::needless_bitwise_bool \ 490 -Aclippy::needless_lifetimes \ 491 -Wclippy::no_mangle_with_rust_abi \ 492 -Wclippy::ptr_as_ptr \ 493 -Wclippy::ptr_cast_constness \ 494 -Wclippy::ref_as_ptr \ 495 -Wclippy::undocumented_unsafe_blocks \ 496 -Wclippy::unnecessary_safety_comment \ 497 -Wclippy::unnecessary_safety_doc \ 498 -Wrustdoc::missing_crate_level_docs \ 499 -Wrustdoc::unescaped_backticks 500 501KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 502 $(HOSTCFLAGS) -I $(srctree)/scripts/include 503KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 504 -I $(srctree)/scripts/include 505KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 506 -Zallow-features= $(HOSTRUSTFLAGS) 507KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 508KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 509KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 510 511# Make variables (CC, etc...) 512CPP = $(CC) -E 513ifneq ($(LLVM),) 514CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 515LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 516AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 517NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 518OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 519OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 520READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 521STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 522else 523CC = $(CROSS_COMPILE)gcc 524LD = $(CROSS_COMPILE)ld 525AR = $(CROSS_COMPILE)ar 526NM = $(CROSS_COMPILE)nm 527OBJCOPY = $(CROSS_COMPILE)objcopy 528OBJDUMP = $(CROSS_COMPILE)objdump 529READELF = $(CROSS_COMPILE)readelf 530STRIP = $(CROSS_COMPILE)strip 531endif 532RUSTC = rustc 533RUSTDOC = rustdoc 534RUSTFMT = rustfmt 535CLIPPY_DRIVER = clippy-driver 536BINDGEN = bindgen 537PAHOLE = pahole 538RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 539LEX = flex 540YACC = bison 541AWK = awk 542INSTALLKERNEL := installkernel 543PERL = perl 544PYTHON3 = python3 545CHECK = sparse 546BASH = bash 547KGZIP = gzip 548KBZIP2 = bzip2 549KLZOP = lzop 550LZMA = lzma 551LZ4 = lz4 552XZ = xz 553ZSTD = zstd 554TAR = tar 555 556CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 557 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 558NOSTDINC_FLAGS := 559CFLAGS_MODULE = 560RUSTFLAGS_MODULE = 561AFLAGS_MODULE = 562LDFLAGS_MODULE = 563CFLAGS_KERNEL = 564RUSTFLAGS_KERNEL = 565AFLAGS_KERNEL = 566LDFLAGS_vmlinux = 567 568# Use USERINCLUDE when you must reference the UAPI directories only. 569USERINCLUDE := \ 570 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 571 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 572 -I$(srctree)/include/uapi \ 573 -I$(objtree)/include/generated/uapi \ 574 -include $(srctree)/include/linux/compiler-version.h \ 575 -include $(srctree)/include/linux/kconfig.h 576 577# Use LINUXINCLUDE when you must reference the include/ directory. 578# Needed to be compatible with the O= option 579LINUXINCLUDE := \ 580 -I$(srctree)/arch/$(SRCARCH)/include \ 581 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 582 -I$(srctree)/include \ 583 -I$(objtree)/include \ 584 $(USERINCLUDE) 585 586KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 587 588KBUILD_CFLAGS := 589KBUILD_CFLAGS += -std=gnu11 590KBUILD_CFLAGS += -fshort-wchar 591KBUILD_CFLAGS += -funsigned-char 592KBUILD_CFLAGS += -fno-common 593KBUILD_CFLAGS += -fno-PIE 594KBUILD_CFLAGS += -fno-strict-aliasing 595 596KBUILD_CPPFLAGS := -D__KERNEL__ 597KBUILD_RUSTFLAGS := $(rust_common_flags) \ 598 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 599 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 600 -Csymbol-mangling-version=v0 \ 601 -Crelocation-model=static \ 602 -Zfunction-sections=n \ 603 -Wclippy::float_arithmetic 604 605KBUILD_AFLAGS_KERNEL := 606KBUILD_CFLAGS_KERNEL := 607KBUILD_RUSTFLAGS_KERNEL := 608KBUILD_AFLAGS_MODULE := -DMODULE 609KBUILD_CFLAGS_MODULE := -DMODULE 610KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 611KBUILD_LDFLAGS_MODULE := 612KBUILD_LDFLAGS := 613CLANG_FLAGS := 614 615ifeq ($(KBUILD_CLIPPY),1) 616 RUSTC_OR_CLIPPY_QUIET := CLIPPY 617 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 618else 619 RUSTC_OR_CLIPPY_QUIET := RUSTC 620 RUSTC_OR_CLIPPY = $(RUSTC) 621endif 622 623# Allows the usage of unstable features in stable compilers. 624export RUSTC_BOOTSTRAP := 1 625 626# Allows finding `.clippy.toml` in out-of-srctree builds. 627export CLIPPY_CONF_DIR := $(srctree) 628 629export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 630export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 631export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 632export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 633export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 634export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 635export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 636export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 637 638export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 639export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 640export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 641export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 642export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 643export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 644 645# Files to ignore in find ... statements 646 647export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 648 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 649 -prune -o 650 651# =========================================================================== 652# Rules shared between *config targets and build targets 653 654# Basic helpers built in scripts/basic/ 655PHONY += scripts_basic 656scripts_basic: 657 $(Q)$(MAKE) $(build)=scripts/basic 658 659PHONY += outputmakefile 660ifdef building_out_of_srctree 661# Before starting out-of-tree build, make sure the source tree is clean. 662# outputmakefile generates a Makefile in the output directory, if using a 663# separate output directory. This allows convenient use of make in the 664# output directory. 665# At the same time when output Makefile generated, generate .gitignore to 666# ignore whole output directory 667 668ifdef KBUILD_EXTMOD 669print_env_for_makefile = \ 670 echo "export KBUILD_OUTPUT = $(objtree)"; \ 671 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 672 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 673else 674print_env_for_makefile = \ 675 echo "export KBUILD_OUTPUT = $(CURDIR)" 676endif 677 678quiet_cmd_makefile = GEN Makefile 679 cmd_makefile = { \ 680 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 681 $(print_env_for_makefile); \ 682 echo "include $(abs_srctree)/Makefile"; \ 683 } > Makefile 684 685outputmakefile: 686ifeq ($(KBUILD_EXTMOD),) 687 @if [ -f $(srctree)/.config -o \ 688 -d $(srctree)/include/config -o \ 689 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 690 echo >&2 "***"; \ 691 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 692 echo >&2 "*** in $(abs_srctree)";\ 693 echo >&2 "***"; \ 694 false; \ 695 fi 696else 697 @if [ -f $(srcroot)/modules.order ]; then \ 698 echo >&2 "***"; \ 699 echo >&2 "*** The external module source tree is not clean."; \ 700 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 701 echo >&2 "***"; \ 702 false; \ 703 fi 704endif 705 $(Q)ln -fsn $(srcroot) source 706 $(call cmd,makefile) 707 $(Q)test -e .gitignore || \ 708 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 709endif 710 711# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 712# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 713# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 714# need export), and from include/config/auto.conf.cmd to detect the compiler 715# upgrade. 716CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 717RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 718 719ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 720include $(srctree)/scripts/Makefile.clang 721endif 722 723# Include this also for config targets because some architectures need 724# cc-cross-prefix to determine CROSS_COMPILE. 725ifdef need-compiler 726include $(srctree)/scripts/Makefile.compiler 727endif 728 729ifdef config-build 730# =========================================================================== 731# *config targets only - make sure prerequisites are updated, and descend 732# in scripts/kconfig to make the *config target 733 734# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 735# KBUILD_DEFCONFIG may point out an alternative default configuration 736# used for 'make defconfig' 737include $(srctree)/arch/$(SRCARCH)/Makefile 738export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 739 740config: outputmakefile scripts_basic FORCE 741 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 742 743%config: outputmakefile scripts_basic FORCE 744 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 745 746else #!config-build 747# =========================================================================== 748# Build targets only - this includes vmlinux, arch-specific targets, clean 749# targets and others. In general all targets except *config targets. 750 751# If building an external module we do not care about the all: rule 752# but instead __all depend on modules 753PHONY += all 754ifeq ($(KBUILD_EXTMOD),) 755__all: all 756else 757__all: modules 758endif 759 760targets := 761 762# Decide whether to build built-in, modular, or both. 763# Normally, just do built-in. 764 765KBUILD_MODULES := 766KBUILD_BUILTIN := y 767 768# If we have only "make modules", don't compile built-in objects. 769ifeq ($(MAKECMDGOALS),modules) 770 KBUILD_BUILTIN := 771endif 772 773# If we have "make <whatever> modules", compile modules 774# in addition to whatever we do anyway. 775# Just "make" or "make all" shall build modules as well 776 777ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 778 KBUILD_MODULES := y 779endif 780 781ifeq ($(MAKECMDGOALS),) 782 KBUILD_MODULES := y 783endif 784 785export KBUILD_MODULES KBUILD_BUILTIN 786 787ifdef need-config 788include $(objtree)/include/config/auto.conf 789endif 790 791ifeq ($(KBUILD_EXTMOD),) 792# Objects we will link into vmlinux / subdirs we need to visit 793core-y := 794drivers-y := 795libs-y := lib/ 796endif # KBUILD_EXTMOD 797 798# The all: target is the default when no target is given on the 799# command line. 800# This allow a user to issue only 'make' to build a kernel including modules 801# Defaults to vmlinux, but the arch makefile usually adds further targets 802all: vmlinux 803 804CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 805ifdef CONFIG_CC_IS_GCC 806CFLAGS_GCOV += -fno-tree-loop-im 807endif 808export CFLAGS_GCOV 809 810# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 811ifdef CONFIG_FUNCTION_TRACER 812 CC_FLAGS_FTRACE := -pg 813endif 814 815ifdef CONFIG_TRACEPOINTS 816# To check for unused tracepoints (tracepoints that are defined but never 817# called), run with: 818# 819# make UT=1 820# 821# Each unused tracepoints can take up to 5KB of memory in the running kernel. 822# It is best to remove any that are not used. 823# 824# This command line option will be removed when all current unused 825# tracepoints are removed. 826 827ifeq ("$(origin UT)", "command line") 828 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 829endif 830endif # CONFIG_TRACEPOINTS 831 832export WARN_ON_UNUSED_TRACEPOINTS 833 834include $(srctree)/arch/$(SRCARCH)/Makefile 835 836ifdef need-config 837ifdef may-sync-config 838# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 839# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 840# because some architectures define CROSS_COMPILE there. 841include include/config/auto.conf.cmd 842 843$(KCONFIG_CONFIG): 844 @echo >&2 '***' 845 @echo >&2 '*** Configuration file "$@" not found!' 846 @echo >&2 '***' 847 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 848 @echo >&2 '*** "make menuconfig" or "make xconfig").' 849 @echo >&2 '***' 850 @/bin/false 851 852# The actual configuration files used during the build are stored in 853# include/generated/ and include/config/. Update them if .config is newer than 854# include/config/auto.conf (which mirrors .config). 855# 856# This exploits the 'multi-target pattern rule' trick. 857# The syncconfig should be executed only once to make all the targets. 858# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 859# 860# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 861# so you cannot notice that Kconfig is waiting for the user input. 862%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 863 $(Q)$(kecho) " SYNC $@" 864 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 865else # !may-sync-config 866# External modules and some install targets need include/generated/autoconf.h 867# and include/config/auto.conf but do not care if they are up-to-date. 868# Use auto.conf to show the error message 869 870checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 871missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 872 873ifdef missing-configs 874PHONY += $(objtree)/include/config/auto.conf 875 876$(objtree)/include/config/auto.conf: 877 @echo >&2 '***' 878 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 879 @printf >&2 '*** - %s\n' $(missing-configs) 880 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 881 @echo >&2 '***' 882 @/bin/false 883endif 884 885endif # may-sync-config 886endif # need-config 887 888KBUILD_CFLAGS += -fno-delete-null-pointer-checks 889 890ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 891KBUILD_CFLAGS += -O2 892KBUILD_RUSTFLAGS += -Copt-level=2 893else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 894KBUILD_CFLAGS += -Os 895KBUILD_RUSTFLAGS += -Copt-level=s 896endif 897 898# Always set `debug-assertions` and `overflow-checks` because their default 899# depends on `opt-level` and `debug-assertions`, respectively. 900KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 901KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 902 903# Tell gcc to never replace conditional load with a non-conditional one 904ifdef CONFIG_CC_IS_GCC 905# gcc-10 renamed --param=allow-store-data-races=0 to 906# -fno-allow-store-data-races. 907KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 908KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 909endif 910 911ifdef CONFIG_READABLE_ASM 912# Disable optimizations that make assembler listings hard to read. 913# reorder blocks reorders the control in the function 914# ipa clone creates specialized cloned functions 915# partial inlining inlines only parts of functions 916KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 917endif 918 919stackp-flags-y := -fno-stack-protector 920stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 921stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 922 923KBUILD_CFLAGS += $(stackp-flags-y) 924 925ifdef CONFIG_FRAME_POINTER 926KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 927KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 928else 929# Some targets (ARM with Thumb2, for example), can't be built with frame 930# pointers. For those, we don't have FUNCTION_TRACER automatically 931# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 932# incompatible with -fomit-frame-pointer with current GCC, so we don't use 933# -fomit-frame-pointer with FUNCTION_TRACER. 934# In the Rust target specification, "frame-pointer" is set explicitly 935# to "may-omit". 936ifndef CONFIG_FUNCTION_TRACER 937KBUILD_CFLAGS += -fomit-frame-pointer 938endif 939endif 940 941# Initialize all stack variables with a 0xAA pattern. 942ifdef CONFIG_INIT_STACK_ALL_PATTERN 943KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 944endif 945 946# Initialize all stack variables with a zero value. 947ifdef CONFIG_INIT_STACK_ALL_ZERO 948KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 949ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 950# https://github.com/llvm/llvm-project/issues/44842 951CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 952export CC_AUTO_VAR_INIT_ZERO_ENABLER 953KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 954endif 955endif 956 957# Explicitly clear padding bits during variable initialization 958KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 959 960# While VLAs have been removed, GCC produces unreachable stack probes 961# for the randomize_kstack_offset feature. Disable it for all compilers. 962KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 963 964# Get details on warnings generated due to GCC value tracking. 965KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 966 967# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 968ifdef CONFIG_ZERO_CALL_USED_REGS 969KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 970endif 971 972ifdef CONFIG_FUNCTION_TRACER 973ifdef CONFIG_FTRACE_MCOUNT_USE_CC 974 CC_FLAGS_FTRACE += -mrecord-mcount 975 ifdef CONFIG_HAVE_NOP_MCOUNT 976 ifeq ($(call cc-option-yn, -mnop-mcount),y) 977 CC_FLAGS_FTRACE += -mnop-mcount 978 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 979 endif 980 endif 981endif 982ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 983 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 984 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 985 endif 986endif 987ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 988 ifdef CONFIG_HAVE_C_RECORDMCOUNT 989 BUILD_C_RECORDMCOUNT := y 990 export BUILD_C_RECORDMCOUNT 991 endif 992endif 993ifdef CONFIG_HAVE_FENTRY 994 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 995 ifeq ($(call cc-option-yn, -mfentry),y) 996 CC_FLAGS_FTRACE += -mfentry 997 CC_FLAGS_USING += -DCC_USING_FENTRY 998 endif 999endif 1000export CC_FLAGS_FTRACE 1001KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1002KBUILD_AFLAGS += $(CC_FLAGS_USING) 1003endif 1004 1005# We trigger additional mismatches with less inlining 1006ifdef CONFIG_DEBUG_SECTION_MISMATCH 1007KBUILD_CFLAGS += -fno-inline-functions-called-once 1008endif 1009 1010# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1011ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1012KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1013KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1014LDFLAGS_vmlinux += --gc-sections 1015endif 1016 1017ifdef CONFIG_SHADOW_CALL_STACK 1018ifndef CONFIG_DYNAMIC_SCS 1019CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1020KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1021KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1022endif 1023export CC_FLAGS_SCS 1024endif 1025 1026ifdef CONFIG_LTO_CLANG 1027ifdef CONFIG_LTO_CLANG_THIN 1028CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1029else 1030CC_FLAGS_LTO := -flto 1031endif 1032CC_FLAGS_LTO += -fvisibility=hidden 1033 1034# Limit inlining across translation units to reduce binary size 1035KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1036endif 1037 1038ifdef CONFIG_LTO 1039KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1040KBUILD_AFLAGS += -fno-lto 1041export CC_FLAGS_LTO 1042endif 1043 1044ifdef CONFIG_CFI 1045CC_FLAGS_CFI := -fsanitize=kcfi 1046ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1047 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1048endif 1049ifdef CONFIG_FINEIBT_BHI 1050 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1051endif 1052ifdef CONFIG_RUST 1053 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1054 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1055 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1056 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1057 export RUSTC_FLAGS_CFI 1058endif 1059KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1060export CC_FLAGS_CFI 1061endif 1062 1063# Architectures can define flags to add/remove for floating-point support 1064CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1065export CC_FLAGS_FPU 1066export CC_FLAGS_NO_FPU 1067 1068ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1069# Set the minimal function alignment. Use the newer GCC option 1070# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1071# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1072ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1073KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1074else 1075KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1076endif 1077endif 1078 1079# arch Makefile may override CC so keep this after arch Makefile is included 1080NOSTDINC_FLAGS += -nostdinc 1081 1082# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1083# the kernel uses only C99 flexible arrays for dynamically sized trailing 1084# arrays. Enforce this for everything that may examine structure sizes and 1085# perform bounds checking. 1086KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1087 1088# Allow including a tagged struct or union anonymously in another struct/union. 1089KBUILD_CFLAGS += -fms-extensions 1090 1091# disable invalid "can't wrap" optimizations for signed / pointers 1092KBUILD_CFLAGS += -fno-strict-overflow 1093 1094# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1095KBUILD_CFLAGS += -fno-stack-check 1096 1097# conserve stack if available 1098ifdef CONFIG_CC_IS_GCC 1099KBUILD_CFLAGS += -fconserve-stack 1100endif 1101 1102# Ensure compilers do not transform certain loops into calls to wcslen() 1103KBUILD_CFLAGS += -fno-builtin-wcslen 1104 1105# change __FILE__ to the relative path to the source directory 1106ifdef building_out_of_srctree 1107KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1108endif 1109 1110# include additional Makefiles when needed 1111include-y := scripts/Makefile.warn 1112include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1113include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1114include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1115include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1116include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1117include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1118include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1119include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1120include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1121include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1122include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1123include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1124 1125include $(addprefix $(srctree)/, $(include-y)) 1126 1127# scripts/Makefile.gcc-plugins is intentionally included last. 1128# Do not add $(call cc-option,...) below this line. When you build the kernel 1129# from the clean source tree, the GCC plugins do not exist at this point. 1130 1131# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1132KBUILD_CPPFLAGS += $(KCPPFLAGS) 1133KBUILD_AFLAGS += $(KAFLAGS) 1134KBUILD_CFLAGS += $(KCFLAGS) 1135KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1136 1137KBUILD_LDFLAGS_MODULE += --build-id=sha1 1138LDFLAGS_vmlinux += --build-id=sha1 1139 1140KBUILD_LDFLAGS += -z noexecstack 1141ifeq ($(CONFIG_LD_IS_BFD),y) 1142KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1143endif 1144 1145ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1146LDFLAGS_vmlinux += -X 1147endif 1148 1149ifeq ($(CONFIG_RELR),y) 1150# ld.lld before 15 did not support -z pack-relative-relocs. 1151LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1152endif 1153 1154# We never want expected sections to be placed heuristically by the 1155# linker. All sections should be explicitly named in the linker script. 1156ifdef CONFIG_LD_ORPHAN_WARN 1157LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1158endif 1159 1160ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1161LDFLAGS_vmlinux += --emit-relocs --discard-none 1162endif 1163 1164# Align the architecture of userspace programs with the kernel 1165USERFLAGS_FROM_KERNEL := --target=% 1166 1167ifdef CONFIG_ARCH_USERFLAGS 1168KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1169KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1170else 1171# If not overridden also inherit the bit size 1172USERFLAGS_FROM_KERNEL += -m32 -m64 1173endif 1174 1175KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1176KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1177 1178# userspace programs are linked via the compiler, use the correct linker 1179ifdef CONFIG_CC_IS_CLANG 1180KBUILD_USERLDFLAGS += --ld-path=$(LD) 1181endif 1182 1183# make the checker run with the right architecture 1184CHECKFLAGS += --arch=$(ARCH) 1185 1186# insure the checker run with the right endianness 1187CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1188 1189# the checker needs the correct machine size 1190CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1191 1192# Default kernel image to build when no specific target is given. 1193# KBUILD_IMAGE may be overruled on the command line or 1194# set in the environment 1195# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1196# this default value 1197export KBUILD_IMAGE ?= vmlinux 1198 1199# 1200# INSTALL_PATH specifies where to place the updated kernel and system map 1201# images. Default is /boot, but you can set it to other values 1202export INSTALL_PATH ?= /boot 1203 1204# 1205# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1206# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1207# an argument if needed. Otherwise it defaults to the kernel install path 1208# 1209export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1210 1211# 1212# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1213# relocations required by build roots. This is not defined in the 1214# makefile but the argument can be passed to make if needed. 1215# 1216 1217MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1218export MODLIB 1219 1220PHONY += prepare0 1221 1222ifeq ($(KBUILD_EXTMOD),) 1223 1224build-dir := . 1225clean-dirs := $(sort . Documentation \ 1226 $(patsubst %/,%,$(filter %/, $(core-) \ 1227 $(drivers-) $(libs-)))) 1228 1229export ARCH_CORE := $(core-y) 1230export ARCH_LIB := $(filter %/, $(libs-y)) 1231export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1232# Externally visible symbols (used by link-vmlinux.sh) 1233 1234KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1235KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1236 1237export KBUILD_VMLINUX_LIBS 1238export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1239 1240ifdef CONFIG_TRIM_UNUSED_KSYMS 1241# For the kernel to actually contain only the needed exported symbols, 1242# we have to build modules as well to determine what those symbols are. 1243KBUILD_MODULES := y 1244endif 1245 1246# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1247quiet_cmd_ar_vmlinux.a = AR $@ 1248 cmd_ar_vmlinux.a = \ 1249 rm -f $@; \ 1250 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1251 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1252 1253targets += vmlinux.a 1254vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1255 $(call if_changed,ar_vmlinux.a) 1256 1257PHONY += vmlinux_o 1258vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1259 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1260 1261vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1262 @: 1263 1264PHONY += vmlinux 1265# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1266# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1267# unrelated; the decompressors just happen to have the same base name, 1268# arch/*/boot/compressed/vmlinux. 1269# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1270# 1271# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1272# https://savannah.gnu.org/bugs/?61463 1273# For Make > 4.4, the following simple code will work: 1274# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1275vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1276vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1277vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1278 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1279 1280# The actual objects are generated when descending, 1281# make sure no implicit rule kicks in 1282$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1283 1284ifeq ($(origin KERNELRELEASE),file) 1285filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1286else 1287filechk_kernel.release = echo $(KERNELRELEASE) 1288endif 1289 1290# Store (new) KERNELRELEASE string in include/config/kernel.release 1291include/config/kernel.release: FORCE 1292 $(call filechk,kernel.release) 1293 1294# Additional helpers built in scripts/ 1295# Carefully list dependencies so we do not try to build scripts twice 1296# in parallel 1297PHONY += scripts 1298scripts: scripts_basic scripts_dtc 1299 $(Q)$(MAKE) $(build)=$(@) 1300 1301# Things we need to do before we recursively start building the kernel 1302# or the modules are listed in "prepare". 1303# A multi level approach is used. prepareN is processed before prepareN-1. 1304# archprepare is used in arch Makefiles and when processed asm symlink, 1305# version.h and scripts_basic is processed / created. 1306 1307PHONY += prepare archprepare 1308 1309archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1310 asm-generic $(version_h) include/generated/utsrelease.h \ 1311 include/generated/compile.h include/generated/autoconf.h \ 1312 include/generated/rustc_cfg remove-stale-files 1313 1314prepare0: archprepare 1315 $(Q)$(MAKE) $(build)=scripts/mod 1316 $(Q)$(MAKE) $(build)=. prepare 1317 1318# All the preparing.. 1319prepare: prepare0 1320ifdef CONFIG_RUST 1321 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1322 $(Q)$(MAKE) $(build)=rust 1323endif 1324 1325PHONY += remove-stale-files 1326remove-stale-files: 1327 $(Q)$(srctree)/scripts/remove-stale-files 1328 1329# Support for using generic headers in asm-generic 1330asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1331 1332PHONY += asm-generic uapi-asm-generic 1333asm-generic: uapi-asm-generic 1334 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1335 generic=include/asm-generic 1336uapi-asm-generic: 1337 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1338 generic=include/uapi/asm-generic 1339 1340# Generate some files 1341# --------------------------------------------------------------------------- 1342 1343# KERNELRELEASE can change from a few different places, meaning version.h 1344# needs to be updated, so this check is forced on all builds 1345 1346uts_len := 64 1347define filechk_utsrelease.h 1348 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1349 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1350 exit 1; \ 1351 fi; \ 1352 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1353endef 1354 1355define filechk_version.h 1356 if [ $(SUBLEVEL) -gt 255 ]; then \ 1357 echo \#define LINUX_VERSION_CODE $(shell \ 1358 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1359 else \ 1360 echo \#define LINUX_VERSION_CODE $(shell \ 1361 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1362 fi; \ 1363 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1364 ((c) > 255 ? 255 : (c)))'; \ 1365 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1366 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1367 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1368endef 1369 1370$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1371$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1372$(version_h): FORCE 1373 $(call filechk,version.h) 1374 1375include/generated/utsrelease.h: include/config/kernel.release FORCE 1376 $(call filechk,utsrelease.h) 1377 1378filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1379 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1380 1381include/generated/compile.h: FORCE 1382 $(call filechk,compile.h) 1383 1384PHONY += headerdep 1385headerdep: 1386 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1387 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1388 1389# --------------------------------------------------------------------------- 1390# Kernel headers 1391 1392#Default location for installed headers 1393export INSTALL_HDR_PATH = $(objtree)/usr 1394 1395quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1396 cmd_headers_install = \ 1397 mkdir -p $(INSTALL_HDR_PATH); \ 1398 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1399 usr/include $(INSTALL_HDR_PATH) 1400 1401PHONY += headers_install 1402headers_install: headers 1403 $(call cmd,headers_install) 1404 1405PHONY += archheaders archscripts 1406 1407hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1408 1409PHONY += headers 1410headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1411ifdef HEADER_ARCH 1412 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1413else 1414 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1415 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1416endif 1417 1418ifdef CONFIG_HEADERS_INSTALL 1419prepare: headers 1420endif 1421 1422PHONY += usr_gen_init_cpio 1423usr_gen_init_cpio: scripts_basic 1424 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1425 1426PHONY += scripts_unifdef 1427scripts_unifdef: scripts_basic 1428 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1429 1430PHONY += scripts_gen_packed_field_checks 1431scripts_gen_packed_field_checks: scripts_basic 1432 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1433 1434# --------------------------------------------------------------------------- 1435# Install 1436 1437# Many distributions have the custom install script, /sbin/installkernel. 1438# If DKMS is installed, 'make install' will eventually recurse back 1439# to this Makefile to build and install external modules. 1440# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1441 1442quiet_cmd_install = INSTALL $(INSTALL_PATH) 1443 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1444 1445# --------------------------------------------------------------------------- 1446# vDSO install 1447 1448PHONY += vdso_install 1449vdso_install: export INSTALL_FILES = $(vdso-install-y) 1450vdso_install: 1451 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1452 1453# --------------------------------------------------------------------------- 1454# Tools 1455 1456ifdef CONFIG_OBJTOOL 1457prepare: tools/objtool 1458endif 1459 1460ifdef CONFIG_BPF 1461ifdef CONFIG_DEBUG_INFO_BTF 1462prepare: tools/bpf/resolve_btfids 1463endif 1464endif 1465 1466# The tools build system is not a part of Kbuild and tends to introduce 1467# its own unique issues. If you need to integrate a new tool into Kbuild, 1468# please consider locating that tool outside the tools/ tree and using the 1469# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1470# here. See Documentation/kbuild/makefiles.rst for details. 1471 1472PHONY += resolve_btfids_clean 1473 1474resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1475 1476# tools/bpf/resolve_btfids directory might not exist 1477# in output directory, skip its clean in that case 1478resolve_btfids_clean: 1479ifneq ($(wildcard $(resolve_btfids_O)),) 1480 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1481endif 1482 1483tools/: FORCE 1484 $(Q)mkdir -p $(objtree)/tools 1485 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1486 1487tools/%: FORCE 1488 $(Q)mkdir -p $(objtree)/tools 1489 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1490 1491# --------------------------------------------------------------------------- 1492# Kernel selftest 1493 1494PHONY += kselftest 1495kselftest: headers 1496 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1497 1498kselftest-%: headers FORCE 1499 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1500 1501PHONY += kselftest-merge 1502kselftest-merge: 1503 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1504 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1505 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1506 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1507 1508# --------------------------------------------------------------------------- 1509# Devicetree files 1510 1511ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1512dtstree := arch/$(SRCARCH)/boot/dts 1513endif 1514 1515ifneq ($(dtstree),) 1516 1517%.dtb: dtbs_prepare 1518 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1519 1520%.dtbo: dtbs_prepare 1521 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1522 1523PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1524dtbs: dtbs_prepare 1525 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1526 1527# include/config/kernel.release is actually needed when installing DTBs because 1528# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1529# dtbs_install depend on it as dtbs_install may run as root. 1530dtbs_prepare: include/config/kernel.release scripts_dtc 1531 1532ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1533export CHECK_DTBS=y 1534endif 1535 1536ifneq ($(CHECK_DTBS),) 1537dtbs_prepare: dt_binding_schemas 1538endif 1539 1540dtbs_check: dtbs 1541 1542dtbs_install: 1543 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1544 1545ifdef CONFIG_OF_EARLY_FLATTREE 1546all: dtbs 1547endif 1548 1549ifdef CONFIG_GENERIC_BUILTIN_DTB 1550vmlinux: dtbs 1551endif 1552 1553endif 1554 1555PHONY += scripts_dtc 1556scripts_dtc: scripts_basic 1557 $(Q)$(MAKE) $(build)=scripts/dtc 1558 1559ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1560export CHECK_DTBS=y 1561endif 1562 1563PHONY += dt_binding_check dt_binding_schemas 1564dt_binding_check: dt_binding_schemas scripts_dtc 1565 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1566 1567dt_binding_schemas: 1568 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1569 1570PHONY += dt_compatible_check 1571dt_compatible_check: dt_binding_schemas 1572 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1573 1574# --------------------------------------------------------------------------- 1575# Modules 1576 1577ifdef CONFIG_MODULES 1578 1579# By default, build modules as well 1580 1581all: modules 1582 1583# When we're building modules with modversions, we need to consider 1584# the built-in objects during the descend as well, in order to 1585# make sure the checksums are up to date before we record them. 1586ifdef CONFIG_MODVERSIONS 1587 KBUILD_BUILTIN := y 1588endif 1589 1590# Build modules 1591# 1592 1593# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1594# is an exception. 1595ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1596KBUILD_BUILTIN := y 1597modules: vmlinux 1598endif 1599 1600modules: modules_prepare 1601 1602# Target to prepare building external modules 1603modules_prepare: prepare 1604 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1605 1606endif # CONFIG_MODULES 1607 1608### 1609# Cleaning is done on three levels. 1610# make clean Delete most generated files 1611# Leave enough to build external modules 1612# make mrproper Delete the current configuration, and all generated files 1613# make distclean Remove editor backup files, patch leftover files and the like 1614 1615# Directories & files removed with 'make clean' 1616CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1617 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1618 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1619 compile_commands.json rust/test \ 1620 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1621 .builtin-dtbs-list .builtin-dtb.S 1622 1623# Directories & files removed with 'make mrproper' 1624MRPROPER_FILES += include/config include/generated \ 1625 arch/$(SRCARCH)/include/generated .objdiff \ 1626 debian snap tar-install PKGBUILD pacman \ 1627 .config .config.old .version \ 1628 Module.symvers \ 1629 certs/signing_key.pem \ 1630 certs/x509.genkey \ 1631 vmlinux-gdb.py \ 1632 rpmbuild \ 1633 rust/libmacros.so rust/libmacros.dylib 1634 1635# clean - Delete most, but leave enough to build external modules 1636# 1637clean: private rm-files := $(CLEAN_FILES) 1638 1639PHONY += archclean vmlinuxclean 1640 1641vmlinuxclean: 1642 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1643 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1644 1645clean: archclean vmlinuxclean resolve_btfids_clean 1646 1647# mrproper - Delete all generated files, including .config 1648# 1649mrproper: private rm-files := $(MRPROPER_FILES) 1650mrproper-dirs := $(addprefix _mrproper_,scripts) 1651 1652PHONY += $(mrproper-dirs) mrproper 1653$(mrproper-dirs): 1654 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1655 1656mrproper: clean $(mrproper-dirs) 1657 $(call cmd,rmfiles) 1658 @find . $(RCS_FIND_IGNORE) \ 1659 \( -name '*.rmeta' \) \ 1660 -type f -print | xargs rm -f 1661 1662# distclean 1663# 1664PHONY += distclean 1665 1666distclean: mrproper 1667 @find . $(RCS_FIND_IGNORE) \ 1668 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1669 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1670 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1671 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1672 -type f -print | xargs rm -f 1673 1674 1675# Packaging of the kernel to various formats 1676# --------------------------------------------------------------------------- 1677 1678modules-cpio-pkg: usr_gen_init_cpio 1679 1680%src-pkg: FORCE 1681 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1682%pkg: include/config/kernel.release FORCE 1683 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1684 1685# Brief documentation of the typical targets used 1686# --------------------------------------------------------------------------- 1687 1688boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1689boards := $(sort $(notdir $(boards))) 1690board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1691board-dirs := $(sort $(notdir $(board-dirs:/=))) 1692 1693PHONY += help 1694help: 1695 @echo 'Cleaning targets:' 1696 @echo ' clean - Remove most generated files but keep the config and' 1697 @echo ' enough build support to build external modules' 1698 @echo ' mrproper - Remove all generated files + config + various backup files' 1699 @echo ' distclean - mrproper + remove editor backup and patch files' 1700 @echo '' 1701 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1702 @echo '' 1703 @echo 'Other generic targets:' 1704 @echo ' all - Build all targets marked with [*]' 1705 @echo '* vmlinux - Build the bare kernel' 1706 @echo '* modules - Build all modules' 1707 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1708 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1709 @echo ' dir/ - Build all files in dir and below' 1710 @echo ' dir/file.[ois] - Build specified target only' 1711 @echo ' dir/file.ll - Build the LLVM assembly file' 1712 @echo ' (requires compiler support for LLVM assembly generation)' 1713 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1714 @echo ' (requires a recent binutils and recent build (System.map))' 1715 @echo ' dir/file.ko - Build module including final link' 1716 @echo ' modules_prepare - Set up for building external modules' 1717 @echo ' tags/TAGS - Generate tags file for editors' 1718 @echo ' cscope - Generate cscope index' 1719 @echo ' gtags - Generate GNU GLOBAL index' 1720 @echo ' kernelrelease - Output the release version string (use with make -s)' 1721 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1722 @echo ' image_name - Output the image name (use with make -s)' 1723 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1724 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1725 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1726 echo '' 1727 @echo 'Static analysers:' 1728 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1729 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1730 @echo ' versioncheck - Sanity check on version.h usage' 1731 @echo ' includecheck - Check for duplicate included header files' 1732 @echo ' headerdep - Detect inclusion cycles in headers' 1733 @echo ' coccicheck - Check with Coccinelle' 1734 @echo ' clang-analyzer - Check with clang static analyzer' 1735 @echo ' clang-tidy - Check with clang-tidy' 1736 @echo '' 1737 @echo 'Tools:' 1738 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1739 @echo '' 1740 @echo 'Kernel selftest:' 1741 @echo ' kselftest - Build and run kernel selftest' 1742 @echo ' Build, install, and boot kernel before' 1743 @echo ' running kselftest on it' 1744 @echo ' Run as root for full coverage' 1745 @echo ' kselftest-all - Build kernel selftest' 1746 @echo ' kselftest-install - Build and install kernel selftest' 1747 @echo ' kselftest-clean - Remove all generated kselftest files' 1748 @echo ' kselftest-merge - Merge all the config dependencies of' 1749 @echo ' kselftest to existing .config.' 1750 @echo '' 1751 @echo 'Rust targets:' 1752 @echo ' rustavailable - Checks whether the Rust toolchain is' 1753 @echo ' available and, if not, explains why.' 1754 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1755 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1756 @echo ' is formatted, printing a diff otherwise.' 1757 @echo ' rustdoc - Generate Rust documentation' 1758 @echo ' (requires kernel .config)' 1759 @echo ' rusttest - Runs the Rust tests' 1760 @echo ' (requires kernel .config; downloads external repos)' 1761 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1762 @echo ' (requires kernel .config)' 1763 @echo ' dir/file.[os] - Build specified target only' 1764 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1765 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1766 @echo ' The output is not intended to be compilable.' 1767 @echo ' dir/file.ll - Build the LLVM assembly file' 1768 @echo '' 1769 @$(if $(dtstree), \ 1770 echo 'Devicetree:'; \ 1771 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1772 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1773 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1774 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1775 echo ' dtbs_check - Validate device tree source files';\ 1776 echo '') 1777 1778 @echo 'Userspace tools targets:' 1779 @echo ' use "make tools/help"' 1780 @echo ' or "cd tools; make help"' 1781 @echo '' 1782 @echo 'Kernel packaging:' 1783 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1784 @echo '' 1785 @echo 'Documentation targets:' 1786 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1787 @echo '' 1788 @echo 'Architecture-specific targets ($(SRCARCH)):' 1789 @$(or $(archhelp),\ 1790 echo ' No architecture-specific help defined for $(SRCARCH)') 1791 @echo '' 1792 @$(if $(boards), \ 1793 $(foreach b, $(boards), \ 1794 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1795 echo '') 1796 @$(if $(board-dirs), \ 1797 $(foreach b, $(board-dirs), \ 1798 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1799 printf " %-16s - Show all of the above\\n" help-boards; \ 1800 echo '') 1801 1802 @echo ' make V=n [targets] 1: verbose build' 1803 @echo ' 2: give reason for rebuild of target' 1804 @echo ' V=1 and V=2 can be combined with V=12' 1805 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1806 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1807 @echo ' (sparse by default)' 1808 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1809 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1810 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1811 @echo ' 1: warnings which may be relevant and do not occur too often' 1812 @echo ' 2: warnings which occur quite often but may still be relevant' 1813 @echo ' 3: more obscure warnings, can most likely be ignored' 1814 @echo ' c: extra checks in the configuration stage (Kconfig)' 1815 @echo ' e: warnings are being treated as errors' 1816 @echo ' Multiple levels can be combined with W=12 or W=123' 1817 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1818 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1819 @$(if $(dtstree), \ 1820 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1821 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1822 ) 1823 @echo '' 1824 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1825 @echo 'For further info see the ./README file' 1826 1827 1828help-board-dirs := $(addprefix help-,$(board-dirs)) 1829 1830help-boards: $(help-board-dirs) 1831 1832boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1833 1834$(help-board-dirs): help-%: 1835 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1836 @$(if $(boards-per-dir), \ 1837 $(foreach b, $(boards-per-dir), \ 1838 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1839 echo '') 1840 1841 1842# Documentation targets 1843# --------------------------------------------------------------------------- 1844DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1845 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1846 htmldocs-redirects 1847 1848PHONY += $(DOC_TARGETS) 1849$(DOC_TARGETS): 1850 $(Q)$(MAKE) $(build)=Documentation $@ 1851 1852 1853# Rust targets 1854# --------------------------------------------------------------------------- 1855 1856# "Is Rust available?" target 1857PHONY += rustavailable 1858rustavailable: 1859 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1860 1861# Documentation target 1862# 1863# Using the singular to avoid running afoul of `no-dot-config-targets`. 1864PHONY += rustdoc 1865rustdoc: prepare 1866 $(Q)$(MAKE) $(build)=rust $@ 1867 1868# Testing target 1869PHONY += rusttest 1870rusttest: prepare 1871 $(Q)$(MAKE) $(build)=rust $@ 1872 1873# Formatting targets 1874# 1875# Generated files as well as vendored crates are skipped. 1876PHONY += rustfmt rustfmtcheck 1877 1878rustfmt: 1879 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1880 \( \ 1881 -path $(srctree)/rust/proc-macro2 \ 1882 -o -path $(srctree)/rust/quote \ 1883 -o -path $(srctree)/rust/syn \ 1884 \) -prune -o \ 1885 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1886 | xargs $(RUSTFMT) $(rustfmt_flags) 1887 1888rustfmtcheck: rustfmt_flags = --check 1889rustfmtcheck: rustfmt 1890 1891# Misc 1892# --------------------------------------------------------------------------- 1893 1894PHONY += misc-check 1895misc-check: 1896 $(Q)$(srctree)/scripts/misc-check 1897 1898all: misc-check 1899 1900PHONY += scripts_gdb 1901scripts_gdb: prepare0 1902 $(Q)$(MAKE) $(build)=scripts/gdb 1903 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1904 1905ifdef CONFIG_GDB_SCRIPTS 1906all: scripts_gdb 1907endif 1908 1909else # KBUILD_EXTMOD 1910 1911filechk_kernel.release = echo $(KERNELRELEASE) 1912 1913### 1914# External module support. 1915# When building external modules the kernel used as basis is considered 1916# read-only, and no consistency checks are made and the make 1917# system is not used on the basis kernel. If updates are required 1918# in the basis kernel ordinary make commands (without M=...) must be used. 1919 1920# We are always building only modules. 1921KBUILD_BUILTIN := 1922KBUILD_MODULES := y 1923 1924build-dir := . 1925 1926clean-dirs := . 1927clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1928 1929PHONY += prepare 1930# now expand this into a simple variable to reduce the cost of shell evaluations 1931prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1932prepare: 1933 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1934 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1935 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1936 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1937 fi 1938 1939PHONY += help 1940help: 1941 @echo ' Building external modules.' 1942 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1943 @echo '' 1944 @echo ' modules - default target, build the module(s)' 1945 @echo ' modules_install - install the module' 1946 @echo ' clean - remove generated files in module directory only' 1947 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1948 @echo '' 1949 1950ifndef CONFIG_MODULES 1951modules modules_install: __external_modules_error 1952__external_modules_error: 1953 @echo >&2 '***' 1954 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1955 @echo >&2 '*** You cannot build or install external modules.' 1956 @echo >&2 '***' 1957 @false 1958endif 1959 1960endif # KBUILD_EXTMOD 1961 1962# --------------------------------------------------------------------------- 1963# Modules 1964 1965PHONY += modules modules_install modules_sign modules_prepare 1966 1967modules_install: 1968 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1969 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1970 1971ifeq ($(CONFIG_MODULE_SIG),y) 1972# modules_sign is a subset of modules_install. 1973# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1974modules_sign: modules_install 1975 @: 1976else 1977modules_sign: 1978 @echo >&2 '***' 1979 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1980 @echo >&2 '***' 1981 @false 1982endif 1983 1984ifdef CONFIG_MODULES 1985 1986modules.order: $(build-dir) 1987 @: 1988 1989# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1990# This is solely useful to speed up test compiles. 1991modules: modpost 1992ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1993 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1994endif 1995 1996PHONY += modules_check 1997modules_check: modules.order 1998 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1999 2000else # CONFIG_MODULES 2001 2002modules: 2003 @: 2004 2005KBUILD_MODULES := 2006 2007endif # CONFIG_MODULES 2008 2009PHONY += modpost 2010modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2011 $(if $(KBUILD_MODULES), modules_check) 2012 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2013 2014# Single targets 2015# --------------------------------------------------------------------------- 2016# To build individual files in subdirectories, you can do like this: 2017# 2018# make foo/bar/baz.s 2019# 2020# The supported suffixes for single-target are listed in 'single-targets' 2021# 2022# To build only under specific subdirectories, you can do like this: 2023# 2024# make foo/bar/baz/ 2025 2026ifdef single-build 2027 2028# .ko is special because modpost is needed 2029single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2030single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2031 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2032 2033$(single-ko): single_modules 2034 @: 2035$(single-no-ko): $(build-dir) 2036 @: 2037 2038# Remove modules.order when done because it is not the real one. 2039PHONY += single_modules 2040single_modules: $(single-no-ko) modules_prepare 2041 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2042 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2043ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2044 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2045endif 2046 $(Q)rm -f modules.order 2047 2048single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2049 2050KBUILD_MODULES := y 2051 2052endif 2053 2054prepare: outputmakefile 2055 2056# Preset locale variables to speed up the build process. Limit locale 2057# tweaks to this spot to avoid wrong language settings when running 2058# make menuconfig etc. 2059# Error messages still appears in the original language 2060PHONY += $(build-dir) 2061$(build-dir): prepare 2062 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2063 2064clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2065PHONY += $(clean-dirs) clean 2066$(clean-dirs): 2067 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2068 2069clean: $(clean-dirs) 2070 $(call cmd,rmfiles) 2071 @find . $(RCS_FIND_IGNORE) \ 2072 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2073 -o -name '*.ko.*' \ 2074 -o -name '*.dtb' -o -name '*.dtbo' \ 2075 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2076 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2077 -o -name '*.dwo' -o -name '*.lst' \ 2078 -o -name '*.su' -o -name '*.mod' \ 2079 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2080 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2081 -o -name '*.asn1.[ch]' \ 2082 -o -name '*.symtypes' -o -name 'modules.order' \ 2083 -o -name '*.c.[012]*.*' \ 2084 -o -name '*.ll' \ 2085 -o -name '*.gcno' \ 2086 \) -type f -print \ 2087 -o -name '.tmp_*' -print \ 2088 | xargs rm -rf 2089 2090# Generate tags for editors 2091# --------------------------------------------------------------------------- 2092quiet_cmd_tags = GEN $@ 2093 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2094 2095tags TAGS cscope gtags: FORCE 2096 $(call cmd,tags) 2097 2098# Generate rust-project.json (a file that describes the structure of non-Cargo 2099# Rust projects) for rust-analyzer (an implementation of the Language Server 2100# Protocol). 2101PHONY += rust-analyzer 2102rust-analyzer: 2103 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2104ifdef KBUILD_EXTMOD 2105# FIXME: external modules must not descend into a sub-directory of the kernel 2106 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2107else 2108 $(Q)$(MAKE) $(build)=rust $@ 2109endif 2110 2111# Script to generate missing namespace dependencies 2112# --------------------------------------------------------------------------- 2113 2114PHONY += nsdeps 2115nsdeps: export KBUILD_NSDEPS=1 2116nsdeps: modules 2117 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2118 2119# Clang Tooling 2120# --------------------------------------------------------------------------- 2121 2122quiet_cmd_gen_compile_commands = GEN $@ 2123 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2124 2125compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2126 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2127 $(if $(CONFIG_MODULES), modules.order) FORCE 2128 $(call if_changed,gen_compile_commands) 2129 2130targets += compile_commands.json 2131 2132PHONY += clang-tidy clang-analyzer 2133 2134ifdef CONFIG_CC_IS_CLANG 2135quiet_cmd_clang_tools = CHECK $< 2136 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2137 2138clang-tidy clang-analyzer: compile_commands.json 2139 $(call cmd,clang_tools) 2140else 2141clang-tidy clang-analyzer: 2142 @echo "$@ requires CC=clang" >&2 2143 @false 2144endif 2145 2146# Scripts to check various things for consistency 2147# --------------------------------------------------------------------------- 2148 2149PHONY += includecheck versioncheck coccicheck 2150 2151includecheck: 2152 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2153 -name '*.[hcS]' -type f -print | sort \ 2154 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2155 2156versioncheck: 2157 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2158 -name '*.[hcS]' -type f -print | sort \ 2159 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2160 2161coccicheck: 2162 $(Q)$(BASH) $(srctree)/scripts/$@ 2163 2164PHONY += checkstack kernelrelease kernelversion image_name 2165 2166# UML needs a little special treatment here. It wants to use the host 2167# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2168# else wants $(ARCH), including people doing cross-builds, which means 2169# that $(SUBARCH) doesn't work here. 2170ifeq ($(ARCH), um) 2171CHECKSTACK_ARCH := $(SUBARCH) 2172else 2173CHECKSTACK_ARCH := $(ARCH) 2174endif 2175MINSTACKSIZE ?= 100 2176checkstack: 2177 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2178 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2179 2180kernelrelease: 2181 @$(filechk_kernel.release) 2182 2183kernelversion: 2184 @echo $(KERNELVERSION) 2185 2186image_name: 2187 @echo $(KBUILD_IMAGE) 2188 2189PHONY += run-command 2190run-command: 2191 $(Q)$(KBUILD_RUN_COMMAND) 2192 2193quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2194 cmd_rmfiles = rm -rf $(rm-files) 2195 2196# read saved command lines for existing targets 2197existing-targets := $(wildcard $(sort $(targets))) 2198 2199-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2200 2201endif # config-build 2202endif # mixed-build 2203endif # need-sub-make 2204 2205PHONY += FORCE 2206FORCE: 2207 2208# Declare the contents of the PHONY variable as phony. We keep that 2209# information in a variable so we can use it in if_changed and friends. 2210.PHONY: $(PHONY) 2211