1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 18 4SUBLEVEL = 0 5EXTRAVERSION = 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) 450endif 451 452HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 453HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 454else 455HOSTCC = gcc 456HOSTCXX = g++ 457endif 458HOSTRUSTC = rustc 459HOSTPKG_CONFIG = pkg-config 460 461# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 462# has a logic to call it 463KERNELDOC = $(srctree)/scripts/kernel-doc.py 464export KERNELDOC 465 466KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 467 -O2 -fomit-frame-pointer -std=gnu11 468KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 469KBUILD_USERLDFLAGS := $(USERLDFLAGS) 470 471# These flags apply to all Rust code in the tree, including the kernel and 472# host programs. 473export rust_common_flags := --edition=2021 \ 474 -Zbinary_dep_depinfo=y \ 475 -Astable_features \ 476 -Dnon_ascii_idents \ 477 -Dunsafe_op_in_unsafe_fn \ 478 -Wmissing_docs \ 479 -Wrust_2018_idioms \ 480 -Wunreachable_pub \ 481 -Wclippy::all \ 482 -Wclippy::as_ptr_cast_mut \ 483 -Wclippy::as_underscore \ 484 -Wclippy::cast_lossless \ 485 -Wclippy::ignored_unit_patterns \ 486 -Wclippy::mut_mut \ 487 -Wclippy::needless_bitwise_bool \ 488 -Aclippy::needless_lifetimes \ 489 -Wclippy::no_mangle_with_rust_abi \ 490 -Wclippy::ptr_as_ptr \ 491 -Wclippy::ptr_cast_constness \ 492 -Wclippy::ref_as_ptr \ 493 -Wclippy::undocumented_unsafe_blocks \ 494 -Wclippy::unnecessary_safety_comment \ 495 -Wclippy::unnecessary_safety_doc \ 496 -Wrustdoc::missing_crate_level_docs \ 497 -Wrustdoc::unescaped_backticks 498 499KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 500 $(HOSTCFLAGS) -I $(srctree)/scripts/include 501KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 502 -I $(srctree)/scripts/include 503KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 504 -Zallow-features= $(HOSTRUSTFLAGS) 505KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 506KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 507KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 508 509# Make variables (CC, etc...) 510CPP = $(CC) -E 511ifneq ($(LLVM),) 512CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 513LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 514AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 515NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 516OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 517OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 518READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 519STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 520else 521CC = $(CROSS_COMPILE)gcc 522LD = $(CROSS_COMPILE)ld 523AR = $(CROSS_COMPILE)ar 524NM = $(CROSS_COMPILE)nm 525OBJCOPY = $(CROSS_COMPILE)objcopy 526OBJDUMP = $(CROSS_COMPILE)objdump 527READELF = $(CROSS_COMPILE)readelf 528STRIP = $(CROSS_COMPILE)strip 529endif 530RUSTC = rustc 531RUSTDOC = rustdoc 532RUSTFMT = rustfmt 533CLIPPY_DRIVER = clippy-driver 534BINDGEN = bindgen 535PAHOLE = pahole 536RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 537LEX = flex 538YACC = bison 539AWK = awk 540INSTALLKERNEL := installkernel 541PERL = perl 542PYTHON3 = python3 543CHECK = sparse 544BASH = bash 545KGZIP = gzip 546KBZIP2 = bzip2 547KLZOP = lzop 548LZMA = lzma 549LZ4 = lz4 550XZ = xz 551ZSTD = zstd 552TAR = tar 553 554CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 555 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 556NOSTDINC_FLAGS := 557CFLAGS_MODULE = 558RUSTFLAGS_MODULE = 559AFLAGS_MODULE = 560LDFLAGS_MODULE = 561CFLAGS_KERNEL = 562RUSTFLAGS_KERNEL = 563AFLAGS_KERNEL = 564LDFLAGS_vmlinux = 565 566# Use USERINCLUDE when you must reference the UAPI directories only. 567USERINCLUDE := \ 568 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 569 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 570 -I$(srctree)/include/uapi \ 571 -I$(objtree)/include/generated/uapi \ 572 -include $(srctree)/include/linux/compiler-version.h \ 573 -include $(srctree)/include/linux/kconfig.h 574 575# Use LINUXINCLUDE when you must reference the include/ directory. 576# Needed to be compatible with the O= option 577LINUXINCLUDE := \ 578 -I$(srctree)/arch/$(SRCARCH)/include \ 579 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 580 -I$(srctree)/include \ 581 -I$(objtree)/include \ 582 $(USERINCLUDE) 583 584KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 585 586KBUILD_CFLAGS := 587KBUILD_CFLAGS += -std=gnu11 588KBUILD_CFLAGS += -fshort-wchar 589KBUILD_CFLAGS += -funsigned-char 590KBUILD_CFLAGS += -fno-common 591KBUILD_CFLAGS += -fno-PIE 592KBUILD_CFLAGS += -fno-strict-aliasing 593 594KBUILD_CPPFLAGS := -D__KERNEL__ 595KBUILD_RUSTFLAGS := $(rust_common_flags) \ 596 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 597 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 598 -Csymbol-mangling-version=v0 \ 599 -Crelocation-model=static \ 600 -Zfunction-sections=n \ 601 -Wclippy::float_arithmetic 602 603KBUILD_AFLAGS_KERNEL := 604KBUILD_CFLAGS_KERNEL := 605KBUILD_RUSTFLAGS_KERNEL := 606KBUILD_AFLAGS_MODULE := -DMODULE 607KBUILD_CFLAGS_MODULE := -DMODULE 608KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 609KBUILD_LDFLAGS_MODULE := 610KBUILD_LDFLAGS := 611CLANG_FLAGS := 612 613ifeq ($(KBUILD_CLIPPY),1) 614 RUSTC_OR_CLIPPY_QUIET := CLIPPY 615 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 616else 617 RUSTC_OR_CLIPPY_QUIET := RUSTC 618 RUSTC_OR_CLIPPY = $(RUSTC) 619endif 620 621# Allows the usage of unstable features in stable compilers. 622export RUSTC_BOOTSTRAP := 1 623 624# Allows finding `.clippy.toml` in out-of-srctree builds. 625export CLIPPY_CONF_DIR := $(srctree) 626 627export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 628export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 629export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 630export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 631export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 632export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 633export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 634export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 635 636export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 637export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 638export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 639export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 640export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 641export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 642 643# Files to ignore in find ... statements 644 645export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 646 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 647 -prune -o 648 649# =========================================================================== 650# Rules shared between *config targets and build targets 651 652# Basic helpers built in scripts/basic/ 653PHONY += scripts_basic 654scripts_basic: 655 $(Q)$(MAKE) $(build)=scripts/basic 656 657PHONY += outputmakefile 658ifdef building_out_of_srctree 659# Before starting out-of-tree build, make sure the source tree is clean. 660# outputmakefile generates a Makefile in the output directory, if using a 661# separate output directory. This allows convenient use of make in the 662# output directory. 663# At the same time when output Makefile generated, generate .gitignore to 664# ignore whole output directory 665 666ifdef KBUILD_EXTMOD 667print_env_for_makefile = \ 668 echo "export KBUILD_OUTPUT = $(objtree)"; \ 669 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 670 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 671else 672print_env_for_makefile = \ 673 echo "export KBUILD_OUTPUT = $(CURDIR)" 674endif 675 676quiet_cmd_makefile = GEN Makefile 677 cmd_makefile = { \ 678 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 679 $(print_env_for_makefile); \ 680 echo "include $(abs_srctree)/Makefile"; \ 681 } > Makefile 682 683outputmakefile: 684ifeq ($(KBUILD_EXTMOD),) 685 @if [ -f $(srctree)/.config -o \ 686 -d $(srctree)/include/config -o \ 687 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 688 echo >&2 "***"; \ 689 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 690 echo >&2 "*** in $(abs_srctree)";\ 691 echo >&2 "***"; \ 692 false; \ 693 fi 694else 695 @if [ -f $(srcroot)/modules.order ]; then \ 696 echo >&2 "***"; \ 697 echo >&2 "*** The external module source tree is not clean."; \ 698 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 699 echo >&2 "***"; \ 700 false; \ 701 fi 702endif 703 $(Q)ln -fsn $(srcroot) source 704 $(call cmd,makefile) 705 $(Q)test -e .gitignore || \ 706 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 707endif 708 709# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 710# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 711# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 712# need export), and from include/config/auto.conf.cmd to detect the compiler 713# upgrade. 714CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 715RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 716 717ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 718include $(srctree)/scripts/Makefile.clang 719endif 720 721# Include this also for config targets because some architectures need 722# cc-cross-prefix to determine CROSS_COMPILE. 723ifdef need-compiler 724include $(srctree)/scripts/Makefile.compiler 725endif 726 727ifdef config-build 728# =========================================================================== 729# *config targets only - make sure prerequisites are updated, and descend 730# in scripts/kconfig to make the *config target 731 732# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 733# KBUILD_DEFCONFIG may point out an alternative default configuration 734# used for 'make defconfig' 735include $(srctree)/arch/$(SRCARCH)/Makefile 736export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 737 738config: outputmakefile scripts_basic FORCE 739 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 740 741%config: outputmakefile scripts_basic FORCE 742 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 743 744else #!config-build 745# =========================================================================== 746# Build targets only - this includes vmlinux, arch-specific targets, clean 747# targets and others. In general all targets except *config targets. 748 749# If building an external module we do not care about the all: rule 750# but instead __all depend on modules 751PHONY += all 752ifeq ($(KBUILD_EXTMOD),) 753__all: all 754else 755__all: modules 756endif 757 758targets := 759 760# Decide whether to build built-in, modular, or both. 761# Normally, just do built-in. 762 763KBUILD_MODULES := 764KBUILD_BUILTIN := y 765 766# If we have only "make modules", don't compile built-in objects. 767ifeq ($(MAKECMDGOALS),modules) 768 KBUILD_BUILTIN := 769endif 770 771# If we have "make <whatever> modules", compile modules 772# in addition to whatever we do anyway. 773# Just "make" or "make all" shall build modules as well 774 775ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 776 KBUILD_MODULES := y 777endif 778 779ifeq ($(MAKECMDGOALS),) 780 KBUILD_MODULES := y 781endif 782 783export KBUILD_MODULES KBUILD_BUILTIN 784 785ifdef need-config 786include $(objtree)/include/config/auto.conf 787endif 788 789ifeq ($(KBUILD_EXTMOD),) 790# Objects we will link into vmlinux / subdirs we need to visit 791core-y := 792drivers-y := 793libs-y := lib/ 794endif # KBUILD_EXTMOD 795 796# The all: target is the default when no target is given on the 797# command line. 798# This allow a user to issue only 'make' to build a kernel including modules 799# Defaults to vmlinux, but the arch makefile usually adds further targets 800all: vmlinux 801 802CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 803ifdef CONFIG_CC_IS_GCC 804CFLAGS_GCOV += -fno-tree-loop-im 805endif 806export CFLAGS_GCOV 807 808# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 809ifdef CONFIG_FUNCTION_TRACER 810 CC_FLAGS_FTRACE := -pg 811endif 812 813ifdef CONFIG_TRACEPOINTS 814# To check for unused tracepoints (tracepoints that are defined but never 815# called), run with: 816# 817# make UT=1 818# 819# Each unused tracepoints can take up to 5KB of memory in the running kernel. 820# It is best to remove any that are not used. 821# 822# This command line option will be removed when all current unused 823# tracepoints are removed. 824 825ifeq ("$(origin UT)", "command line") 826 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 827endif 828endif # CONFIG_TRACEPOINTS 829 830export WARN_ON_UNUSED_TRACEPOINTS 831 832include $(srctree)/arch/$(SRCARCH)/Makefile 833 834ifdef need-config 835ifdef may-sync-config 836# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 837# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 838# because some architectures define CROSS_COMPILE there. 839include include/config/auto.conf.cmd 840 841$(KCONFIG_CONFIG): 842 @echo >&2 '***' 843 @echo >&2 '*** Configuration file "$@" not found!' 844 @echo >&2 '***' 845 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 846 @echo >&2 '*** "make menuconfig" or "make xconfig").' 847 @echo >&2 '***' 848 @/bin/false 849 850# The actual configuration files used during the build are stored in 851# include/generated/ and include/config/. Update them if .config is newer than 852# include/config/auto.conf (which mirrors .config). 853# 854# This exploits the 'multi-target pattern rule' trick. 855# The syncconfig should be executed only once to make all the targets. 856# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 857# 858# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 859# so you cannot notice that Kconfig is waiting for the user input. 860%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 861 $(Q)$(kecho) " SYNC $@" 862 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 863else # !may-sync-config 864# External modules and some install targets need include/generated/autoconf.h 865# and include/config/auto.conf but do not care if they are up-to-date. 866# Use auto.conf to show the error message 867 868checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 869missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 870 871ifdef missing-configs 872PHONY += $(objtree)/include/config/auto.conf 873 874$(objtree)/include/config/auto.conf: 875 @echo >&2 '***' 876 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 877 @printf >&2 '*** - %s\n' $(missing-configs) 878 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 879 @echo >&2 '***' 880 @/bin/false 881endif 882 883endif # may-sync-config 884endif # need-config 885 886KBUILD_CFLAGS += -fno-delete-null-pointer-checks 887 888ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 889KBUILD_CFLAGS += -O2 890KBUILD_RUSTFLAGS += -Copt-level=2 891else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 892KBUILD_CFLAGS += -Os 893KBUILD_RUSTFLAGS += -Copt-level=s 894endif 895 896# Always set `debug-assertions` and `overflow-checks` because their default 897# depends on `opt-level` and `debug-assertions`, respectively. 898KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 899KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 900 901# Tell gcc to never replace conditional load with a non-conditional one 902ifdef CONFIG_CC_IS_GCC 903# gcc-10 renamed --param=allow-store-data-races=0 to 904# -fno-allow-store-data-races. 905KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 906KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 907endif 908 909ifdef CONFIG_READABLE_ASM 910# Disable optimizations that make assembler listings hard to read. 911# reorder blocks reorders the control in the function 912# ipa clone creates specialized cloned functions 913# partial inlining inlines only parts of functions 914KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 915endif 916 917stackp-flags-y := -fno-stack-protector 918stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 919stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 920 921KBUILD_CFLAGS += $(stackp-flags-y) 922 923ifdef CONFIG_FRAME_POINTER 924KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 925KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 926else 927# Some targets (ARM with Thumb2, for example), can't be built with frame 928# pointers. For those, we don't have FUNCTION_TRACER automatically 929# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 930# incompatible with -fomit-frame-pointer with current GCC, so we don't use 931# -fomit-frame-pointer with FUNCTION_TRACER. 932# In the Rust target specification, "frame-pointer" is set explicitly 933# to "may-omit". 934ifndef CONFIG_FUNCTION_TRACER 935KBUILD_CFLAGS += -fomit-frame-pointer 936endif 937endif 938 939# Initialize all stack variables with a 0xAA pattern. 940ifdef CONFIG_INIT_STACK_ALL_PATTERN 941KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 942endif 943 944# Initialize all stack variables with a zero value. 945ifdef CONFIG_INIT_STACK_ALL_ZERO 946KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 947ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 948# https://github.com/llvm/llvm-project/issues/44842 949CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 950export CC_AUTO_VAR_INIT_ZERO_ENABLER 951KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 952endif 953endif 954 955# Explicitly clear padding bits during variable initialization 956KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 957 958# While VLAs have been removed, GCC produces unreachable stack probes 959# for the randomize_kstack_offset feature. Disable it for all compilers. 960KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 961 962# Get details on warnings generated due to GCC value tracking. 963KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 964 965# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 966ifdef CONFIG_ZERO_CALL_USED_REGS 967KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 968endif 969 970ifdef CONFIG_FUNCTION_TRACER 971ifdef CONFIG_FTRACE_MCOUNT_USE_CC 972 CC_FLAGS_FTRACE += -mrecord-mcount 973 ifdef CONFIG_HAVE_NOP_MCOUNT 974 ifeq ($(call cc-option-yn, -mnop-mcount),y) 975 CC_FLAGS_FTRACE += -mnop-mcount 976 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 977 endif 978 endif 979endif 980ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 981 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 982 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 983 endif 984endif 985ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 986 ifdef CONFIG_HAVE_C_RECORDMCOUNT 987 BUILD_C_RECORDMCOUNT := y 988 export BUILD_C_RECORDMCOUNT 989 endif 990endif 991ifdef CONFIG_HAVE_FENTRY 992 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 993 ifeq ($(call cc-option-yn, -mfentry),y) 994 CC_FLAGS_FTRACE += -mfentry 995 CC_FLAGS_USING += -DCC_USING_FENTRY 996 endif 997endif 998export CC_FLAGS_FTRACE 999KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1000KBUILD_AFLAGS += $(CC_FLAGS_USING) 1001endif 1002 1003# We trigger additional mismatches with less inlining 1004ifdef CONFIG_DEBUG_SECTION_MISMATCH 1005KBUILD_CFLAGS += -fno-inline-functions-called-once 1006endif 1007 1008# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1009ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1010KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1011KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1012LDFLAGS_vmlinux += --gc-sections 1013endif 1014 1015ifdef CONFIG_SHADOW_CALL_STACK 1016ifndef CONFIG_DYNAMIC_SCS 1017CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1018KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1019KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1020endif 1021export CC_FLAGS_SCS 1022endif 1023 1024ifdef CONFIG_LTO_CLANG 1025ifdef CONFIG_LTO_CLANG_THIN 1026CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1027else 1028CC_FLAGS_LTO := -flto 1029endif 1030CC_FLAGS_LTO += -fvisibility=hidden 1031 1032# Limit inlining across translation units to reduce binary size 1033KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1034endif 1035 1036ifdef CONFIG_LTO 1037KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1038KBUILD_AFLAGS += -fno-lto 1039export CC_FLAGS_LTO 1040endif 1041 1042ifdef CONFIG_CFI 1043CC_FLAGS_CFI := -fsanitize=kcfi 1044ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1045 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1046endif 1047ifdef CONFIG_FINEIBT_BHI 1048 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1049endif 1050ifdef CONFIG_RUST 1051 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1052 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1053 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1054 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1055 export RUSTC_FLAGS_CFI 1056endif 1057KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1058export CC_FLAGS_CFI 1059endif 1060 1061# Architectures can define flags to add/remove for floating-point support 1062CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1063export CC_FLAGS_FPU 1064export CC_FLAGS_NO_FPU 1065 1066ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1067# Set the minimal function alignment. Use the newer GCC option 1068# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1069# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1070ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1071KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1072else 1073KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1074endif 1075endif 1076 1077# arch Makefile may override CC so keep this after arch Makefile is included 1078NOSTDINC_FLAGS += -nostdinc 1079 1080# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1081# the kernel uses only C99 flexible arrays for dynamically sized trailing 1082# arrays. Enforce this for everything that may examine structure sizes and 1083# perform bounds checking. 1084KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1085 1086# Allow including a tagged struct or union anonymously in another struct/union. 1087KBUILD_CFLAGS += -fms-extensions 1088 1089# disable invalid "can't wrap" optimizations for signed / pointers 1090KBUILD_CFLAGS += -fno-strict-overflow 1091 1092# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1093KBUILD_CFLAGS += -fno-stack-check 1094 1095# conserve stack if available 1096ifdef CONFIG_CC_IS_GCC 1097KBUILD_CFLAGS += -fconserve-stack 1098endif 1099 1100# Ensure compilers do not transform certain loops into calls to wcslen() 1101KBUILD_CFLAGS += -fno-builtin-wcslen 1102 1103# change __FILE__ to the relative path to the source directory 1104ifdef building_out_of_srctree 1105KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=) 1106endif 1107 1108# include additional Makefiles when needed 1109include-y := scripts/Makefile.warn 1110include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1111include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1112include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1113include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1114include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1115include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1116include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1117include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1118include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1119include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1120include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1121include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1122 1123include $(addprefix $(srctree)/, $(include-y)) 1124 1125# scripts/Makefile.gcc-plugins is intentionally included last. 1126# Do not add $(call cc-option,...) below this line. When you build the kernel 1127# from the clean source tree, the GCC plugins do not exist at this point. 1128 1129# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1130KBUILD_CPPFLAGS += $(KCPPFLAGS) 1131KBUILD_AFLAGS += $(KAFLAGS) 1132KBUILD_CFLAGS += $(KCFLAGS) 1133KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1134 1135KBUILD_LDFLAGS_MODULE += --build-id=sha1 1136LDFLAGS_vmlinux += --build-id=sha1 1137 1138KBUILD_LDFLAGS += -z noexecstack 1139ifeq ($(CONFIG_LD_IS_BFD),y) 1140KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1141endif 1142 1143ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1144LDFLAGS_vmlinux += -X 1145endif 1146 1147ifeq ($(CONFIG_RELR),y) 1148# ld.lld before 15 did not support -z pack-relative-relocs. 1149LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1150endif 1151 1152# We never want expected sections to be placed heuristically by the 1153# linker. All sections should be explicitly named in the linker script. 1154ifdef CONFIG_LD_ORPHAN_WARN 1155LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1156endif 1157 1158ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1159LDFLAGS_vmlinux += --emit-relocs --discard-none 1160endif 1161 1162# Align the architecture of userspace programs with the kernel 1163USERFLAGS_FROM_KERNEL := --target=% 1164 1165ifdef CONFIG_ARCH_USERFLAGS 1166KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1167KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1168else 1169# If not overridden also inherit the bit size 1170USERFLAGS_FROM_KERNEL += -m32 -m64 1171endif 1172 1173KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1174KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1175 1176# userspace programs are linked via the compiler, use the correct linker 1177ifdef CONFIG_CC_IS_CLANG 1178KBUILD_USERLDFLAGS += --ld-path=$(LD) 1179endif 1180 1181# make the checker run with the right architecture 1182CHECKFLAGS += --arch=$(ARCH) 1183 1184# insure the checker run with the right endianness 1185CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1186 1187# the checker needs the correct machine size 1188CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1189 1190# Default kernel image to build when no specific target is given. 1191# KBUILD_IMAGE may be overruled on the command line or 1192# set in the environment 1193# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1194# this default value 1195export KBUILD_IMAGE ?= vmlinux 1196 1197# 1198# INSTALL_PATH specifies where to place the updated kernel and system map 1199# images. Default is /boot, but you can set it to other values 1200export INSTALL_PATH ?= /boot 1201 1202# 1203# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1204# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1205# an argument if needed. Otherwise it defaults to the kernel install path 1206# 1207export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1208 1209# 1210# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1211# relocations required by build roots. This is not defined in the 1212# makefile but the argument can be passed to make if needed. 1213# 1214 1215MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1216export MODLIB 1217 1218PHONY += prepare0 1219 1220ifeq ($(KBUILD_EXTMOD),) 1221 1222build-dir := . 1223clean-dirs := $(sort . Documentation \ 1224 $(patsubst %/,%,$(filter %/, $(core-) \ 1225 $(drivers-) $(libs-)))) 1226 1227export ARCH_CORE := $(core-y) 1228export ARCH_LIB := $(filter %/, $(libs-y)) 1229export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1230# Externally visible symbols (used by link-vmlinux.sh) 1231 1232KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1233KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1234 1235export KBUILD_VMLINUX_LIBS 1236export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1237 1238ifdef CONFIG_TRIM_UNUSED_KSYMS 1239# For the kernel to actually contain only the needed exported symbols, 1240# we have to build modules as well to determine what those symbols are. 1241KBUILD_MODULES := y 1242endif 1243 1244# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1245quiet_cmd_ar_vmlinux.a = AR $@ 1246 cmd_ar_vmlinux.a = \ 1247 rm -f $@; \ 1248 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1249 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1250 1251targets += vmlinux.a 1252vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1253 $(call if_changed,ar_vmlinux.a) 1254 1255PHONY += vmlinux_o 1256vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1257 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1258 1259vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1260 @: 1261 1262PHONY += vmlinux 1263# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1264# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1265# unrelated; the decompressors just happen to have the same base name, 1266# arch/*/boot/compressed/vmlinux. 1267# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1268# 1269# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1270# https://savannah.gnu.org/bugs/?61463 1271# For Make > 4.4, the following simple code will work: 1272# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1273vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1274vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1275vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1276 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1277 1278# The actual objects are generated when descending, 1279# make sure no implicit rule kicks in 1280$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1281 1282ifeq ($(origin KERNELRELEASE),file) 1283filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1284else 1285filechk_kernel.release = echo $(KERNELRELEASE) 1286endif 1287 1288# Store (new) KERNELRELEASE string in include/config/kernel.release 1289include/config/kernel.release: FORCE 1290 $(call filechk,kernel.release) 1291 1292# Additional helpers built in scripts/ 1293# Carefully list dependencies so we do not try to build scripts twice 1294# in parallel 1295PHONY += scripts 1296scripts: scripts_basic scripts_dtc 1297 $(Q)$(MAKE) $(build)=$(@) 1298 1299# Things we need to do before we recursively start building the kernel 1300# or the modules are listed in "prepare". 1301# A multi level approach is used. prepareN is processed before prepareN-1. 1302# archprepare is used in arch Makefiles and when processed asm symlink, 1303# version.h and scripts_basic is processed / created. 1304 1305PHONY += prepare archprepare 1306 1307archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1308 asm-generic $(version_h) include/generated/utsrelease.h \ 1309 include/generated/compile.h include/generated/autoconf.h \ 1310 include/generated/rustc_cfg remove-stale-files 1311 1312prepare0: archprepare 1313 $(Q)$(MAKE) $(build)=scripts/mod 1314 $(Q)$(MAKE) $(build)=. prepare 1315 1316# All the preparing.. 1317prepare: prepare0 1318ifdef CONFIG_RUST 1319 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1320 $(Q)$(MAKE) $(build)=rust 1321endif 1322 1323PHONY += remove-stale-files 1324remove-stale-files: 1325 $(Q)$(srctree)/scripts/remove-stale-files 1326 1327# Support for using generic headers in asm-generic 1328asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1329 1330PHONY += asm-generic uapi-asm-generic 1331asm-generic: uapi-asm-generic 1332 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1333 generic=include/asm-generic 1334uapi-asm-generic: 1335 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1336 generic=include/uapi/asm-generic 1337 1338# Generate some files 1339# --------------------------------------------------------------------------- 1340 1341# KERNELRELEASE can change from a few different places, meaning version.h 1342# needs to be updated, so this check is forced on all builds 1343 1344uts_len := 64 1345define filechk_utsrelease.h 1346 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1347 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1348 exit 1; \ 1349 fi; \ 1350 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1351endef 1352 1353define filechk_version.h 1354 if [ $(SUBLEVEL) -gt 255 ]; then \ 1355 echo \#define LINUX_VERSION_CODE $(shell \ 1356 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1357 else \ 1358 echo \#define LINUX_VERSION_CODE $(shell \ 1359 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1360 fi; \ 1361 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1362 ((c) > 255 ? 255 : (c)))'; \ 1363 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1364 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1365 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1366endef 1367 1368$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1369$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1370$(version_h): FORCE 1371 $(call filechk,version.h) 1372 1373include/generated/utsrelease.h: include/config/kernel.release FORCE 1374 $(call filechk,utsrelease.h) 1375 1376filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1377 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1378 1379include/generated/compile.h: FORCE 1380 $(call filechk,compile.h) 1381 1382PHONY += headerdep 1383headerdep: 1384 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1385 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1386 1387# --------------------------------------------------------------------------- 1388# Kernel headers 1389 1390#Default location for installed headers 1391export INSTALL_HDR_PATH = $(objtree)/usr 1392 1393quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1394 cmd_headers_install = \ 1395 mkdir -p $(INSTALL_HDR_PATH); \ 1396 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1397 usr/include $(INSTALL_HDR_PATH) 1398 1399PHONY += headers_install 1400headers_install: headers 1401 $(call cmd,headers_install) 1402 1403PHONY += archheaders archscripts 1404 1405hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1406 1407PHONY += headers 1408headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1409ifdef HEADER_ARCH 1410 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1411else 1412 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1413 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1414endif 1415 1416ifdef CONFIG_HEADERS_INSTALL 1417prepare: headers 1418endif 1419 1420PHONY += scripts_unifdef 1421scripts_unifdef: scripts_basic 1422 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1423 1424PHONY += scripts_gen_packed_field_checks 1425scripts_gen_packed_field_checks: scripts_basic 1426 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1427 1428# --------------------------------------------------------------------------- 1429# Install 1430 1431# Many distributions have the custom install script, /sbin/installkernel. 1432# If DKMS is installed, 'make install' will eventually recurse back 1433# to this Makefile to build and install external modules. 1434# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1435 1436quiet_cmd_install = INSTALL $(INSTALL_PATH) 1437 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1438 1439# --------------------------------------------------------------------------- 1440# vDSO install 1441 1442PHONY += vdso_install 1443vdso_install: export INSTALL_FILES = $(vdso-install-y) 1444vdso_install: 1445 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1446 1447# --------------------------------------------------------------------------- 1448# Tools 1449 1450ifdef CONFIG_OBJTOOL 1451prepare: tools/objtool 1452endif 1453 1454ifdef CONFIG_BPF 1455ifdef CONFIG_DEBUG_INFO_BTF 1456prepare: tools/bpf/resolve_btfids 1457endif 1458endif 1459 1460# The tools build system is not a part of Kbuild and tends to introduce 1461# its own unique issues. If you need to integrate a new tool into Kbuild, 1462# please consider locating that tool outside the tools/ tree and using the 1463# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1464# here. See Documentation/kbuild/makefiles.rst for details. 1465 1466PHONY += resolve_btfids_clean 1467 1468resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1469 1470# tools/bpf/resolve_btfids directory might not exist 1471# in output directory, skip its clean in that case 1472resolve_btfids_clean: 1473ifneq ($(wildcard $(resolve_btfids_O)),) 1474 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1475endif 1476 1477tools/: FORCE 1478 $(Q)mkdir -p $(objtree)/tools 1479 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1480 1481tools/%: FORCE 1482 $(Q)mkdir -p $(objtree)/tools 1483 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1484 1485# --------------------------------------------------------------------------- 1486# Kernel selftest 1487 1488PHONY += kselftest 1489kselftest: headers 1490 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1491 1492kselftest-%: headers FORCE 1493 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1494 1495PHONY += kselftest-merge 1496kselftest-merge: 1497 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1498 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1499 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1500 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1501 1502# --------------------------------------------------------------------------- 1503# Devicetree files 1504 1505ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1506dtstree := arch/$(SRCARCH)/boot/dts 1507endif 1508 1509ifneq ($(dtstree),) 1510 1511%.dtb: dtbs_prepare 1512 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1513 1514%.dtbo: dtbs_prepare 1515 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1516 1517PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1518dtbs: dtbs_prepare 1519 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1520 1521# include/config/kernel.release is actually needed when installing DTBs because 1522# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1523# dtbs_install depend on it as dtbs_install may run as root. 1524dtbs_prepare: include/config/kernel.release scripts_dtc 1525 1526ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1527export CHECK_DTBS=y 1528endif 1529 1530ifneq ($(CHECK_DTBS),) 1531dtbs_prepare: dt_binding_schemas 1532endif 1533 1534dtbs_check: dtbs 1535 1536dtbs_install: 1537 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1538 1539ifdef CONFIG_OF_EARLY_FLATTREE 1540all: dtbs 1541endif 1542 1543ifdef CONFIG_GENERIC_BUILTIN_DTB 1544vmlinux: dtbs 1545endif 1546 1547endif 1548 1549PHONY += scripts_dtc 1550scripts_dtc: scripts_basic 1551 $(Q)$(MAKE) $(build)=scripts/dtc 1552 1553ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1554export CHECK_DTBS=y 1555endif 1556 1557PHONY += dt_binding_check dt_binding_schemas 1558dt_binding_check: dt_binding_schemas scripts_dtc 1559 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1560 1561dt_binding_schemas: 1562 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1563 1564PHONY += dt_compatible_check 1565dt_compatible_check: dt_binding_schemas 1566 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1567 1568# --------------------------------------------------------------------------- 1569# Modules 1570 1571ifdef CONFIG_MODULES 1572 1573# By default, build modules as well 1574 1575all: modules 1576 1577# When we're building modules with modversions, we need to consider 1578# the built-in objects during the descend as well, in order to 1579# make sure the checksums are up to date before we record them. 1580ifdef CONFIG_MODVERSIONS 1581 KBUILD_BUILTIN := y 1582endif 1583 1584# Build modules 1585# 1586 1587# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1588# is an exception. 1589ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1590KBUILD_BUILTIN := y 1591modules: vmlinux 1592endif 1593 1594modules: modules_prepare 1595 1596# Target to prepare building external modules 1597modules_prepare: prepare 1598 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1599 1600endif # CONFIG_MODULES 1601 1602### 1603# Cleaning is done on three levels. 1604# make clean Delete most generated files 1605# Leave enough to build external modules 1606# make mrproper Delete the current configuration, and all generated files 1607# make distclean Remove editor backup files, patch leftover files and the like 1608 1609# Directories & files removed with 'make clean' 1610CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1611 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1612 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1613 compile_commands.json rust/test \ 1614 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1615 .builtin-dtbs-list .builtin-dtb.S 1616 1617# Directories & files removed with 'make mrproper' 1618MRPROPER_FILES += include/config include/generated \ 1619 arch/$(SRCARCH)/include/generated .objdiff \ 1620 debian snap tar-install PKGBUILD pacman \ 1621 .config .config.old .version \ 1622 Module.symvers \ 1623 certs/signing_key.pem \ 1624 certs/x509.genkey \ 1625 vmlinux-gdb.py \ 1626 rpmbuild \ 1627 rust/libmacros.so rust/libmacros.dylib 1628 1629# clean - Delete most, but leave enough to build external modules 1630# 1631clean: private rm-files := $(CLEAN_FILES) 1632 1633PHONY += archclean vmlinuxclean 1634 1635vmlinuxclean: 1636 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1637 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1638 1639clean: archclean vmlinuxclean resolve_btfids_clean 1640 1641# mrproper - Delete all generated files, including .config 1642# 1643mrproper: private rm-files := $(MRPROPER_FILES) 1644mrproper-dirs := $(addprefix _mrproper_,scripts) 1645 1646PHONY += $(mrproper-dirs) mrproper 1647$(mrproper-dirs): 1648 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1649 1650mrproper: clean $(mrproper-dirs) 1651 $(call cmd,rmfiles) 1652 @find . $(RCS_FIND_IGNORE) \ 1653 \( -name '*.rmeta' \) \ 1654 -type f -print | xargs rm -f 1655 1656# distclean 1657# 1658PHONY += distclean 1659 1660distclean: mrproper 1661 @find . $(RCS_FIND_IGNORE) \ 1662 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1663 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1664 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1665 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1666 -type f -print | xargs rm -f 1667 1668 1669# Packaging of the kernel to various formats 1670# --------------------------------------------------------------------------- 1671 1672%src-pkg: FORCE 1673 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1674%pkg: include/config/kernel.release FORCE 1675 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1676 1677# Brief documentation of the typical targets used 1678# --------------------------------------------------------------------------- 1679 1680boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1681boards := $(sort $(notdir $(boards))) 1682board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1683board-dirs := $(sort $(notdir $(board-dirs:/=))) 1684 1685PHONY += help 1686help: 1687 @echo 'Cleaning targets:' 1688 @echo ' clean - Remove most generated files but keep the config and' 1689 @echo ' enough build support to build external modules' 1690 @echo ' mrproper - Remove all generated files + config + various backup files' 1691 @echo ' distclean - mrproper + remove editor backup and patch files' 1692 @echo '' 1693 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1694 @echo '' 1695 @echo 'Other generic targets:' 1696 @echo ' all - Build all targets marked with [*]' 1697 @echo '* vmlinux - Build the bare kernel' 1698 @echo '* modules - Build all modules' 1699 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1700 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1701 @echo ' dir/ - Build all files in dir and below' 1702 @echo ' dir/file.[ois] - Build specified target only' 1703 @echo ' dir/file.ll - Build the LLVM assembly file' 1704 @echo ' (requires compiler support for LLVM assembly generation)' 1705 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1706 @echo ' (requires a recent binutils and recent build (System.map))' 1707 @echo ' dir/file.ko - Build module including final link' 1708 @echo ' modules_prepare - Set up for building external modules' 1709 @echo ' tags/TAGS - Generate tags file for editors' 1710 @echo ' cscope - Generate cscope index' 1711 @echo ' gtags - Generate GNU GLOBAL index' 1712 @echo ' kernelrelease - Output the release version string (use with make -s)' 1713 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1714 @echo ' image_name - Output the image name (use with make -s)' 1715 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1716 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1717 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1718 echo '' 1719 @echo 'Static analysers:' 1720 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1721 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1722 @echo ' versioncheck - Sanity check on version.h usage' 1723 @echo ' includecheck - Check for duplicate included header files' 1724 @echo ' headerdep - Detect inclusion cycles in headers' 1725 @echo ' coccicheck - Check with Coccinelle' 1726 @echo ' clang-analyzer - Check with clang static analyzer' 1727 @echo ' clang-tidy - Check with clang-tidy' 1728 @echo '' 1729 @echo 'Tools:' 1730 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1731 @echo '' 1732 @echo 'Kernel selftest:' 1733 @echo ' kselftest - Build and run kernel selftest' 1734 @echo ' Build, install, and boot kernel before' 1735 @echo ' running kselftest on it' 1736 @echo ' Run as root for full coverage' 1737 @echo ' kselftest-all - Build kernel selftest' 1738 @echo ' kselftest-install - Build and install kernel selftest' 1739 @echo ' kselftest-clean - Remove all generated kselftest files' 1740 @echo ' kselftest-merge - Merge all the config dependencies of' 1741 @echo ' kselftest to existing .config.' 1742 @echo '' 1743 @echo 'Rust targets:' 1744 @echo ' rustavailable - Checks whether the Rust toolchain is' 1745 @echo ' available and, if not, explains why.' 1746 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1747 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1748 @echo ' is formatted, printing a diff otherwise.' 1749 @echo ' rustdoc - Generate Rust documentation' 1750 @echo ' (requires kernel .config)' 1751 @echo ' rusttest - Runs the Rust tests' 1752 @echo ' (requires kernel .config; downloads external repos)' 1753 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1754 @echo ' (requires kernel .config)' 1755 @echo ' dir/file.[os] - Build specified target only' 1756 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1757 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1758 @echo ' The output is not intended to be compilable.' 1759 @echo ' dir/file.ll - Build the LLVM assembly file' 1760 @echo '' 1761 @$(if $(dtstree), \ 1762 echo 'Devicetree:'; \ 1763 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1764 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1765 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1766 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1767 echo ' dtbs_check - Validate device tree source files';\ 1768 echo '') 1769 1770 @echo 'Userspace tools targets:' 1771 @echo ' use "make tools/help"' 1772 @echo ' or "cd tools; make help"' 1773 @echo '' 1774 @echo 'Kernel packaging:' 1775 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1776 @echo '' 1777 @echo 'Documentation targets:' 1778 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1779 @echo '' 1780 @echo 'Architecture-specific targets ($(SRCARCH)):' 1781 @$(or $(archhelp),\ 1782 echo ' No architecture-specific help defined for $(SRCARCH)') 1783 @echo '' 1784 @$(if $(boards), \ 1785 $(foreach b, $(boards), \ 1786 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1787 echo '') 1788 @$(if $(board-dirs), \ 1789 $(foreach b, $(board-dirs), \ 1790 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1791 printf " %-16s - Show all of the above\\n" help-boards; \ 1792 echo '') 1793 1794 @echo ' make V=n [targets] 1: verbose build' 1795 @echo ' 2: give reason for rebuild of target' 1796 @echo ' V=1 and V=2 can be combined with V=12' 1797 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1798 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1799 @echo ' (sparse by default)' 1800 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1801 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1802 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1803 @echo ' 1: warnings which may be relevant and do not occur too often' 1804 @echo ' 2: warnings which occur quite often but may still be relevant' 1805 @echo ' 3: more obscure warnings, can most likely be ignored' 1806 @echo ' c: extra checks in the configuration stage (Kconfig)' 1807 @echo ' e: warnings are being treated as errors' 1808 @echo ' Multiple levels can be combined with W=12 or W=123' 1809 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1810 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1811 @$(if $(dtstree), \ 1812 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1813 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1814 ) 1815 @echo '' 1816 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1817 @echo 'For further info see the ./README file' 1818 1819 1820help-board-dirs := $(addprefix help-,$(board-dirs)) 1821 1822help-boards: $(help-board-dirs) 1823 1824boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1825 1826$(help-board-dirs): help-%: 1827 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1828 @$(if $(boards-per-dir), \ 1829 $(foreach b, $(boards-per-dir), \ 1830 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1831 echo '') 1832 1833 1834# Documentation targets 1835# --------------------------------------------------------------------------- 1836DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1837 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1838 htmldocs-redirects 1839 1840PHONY += $(DOC_TARGETS) 1841$(DOC_TARGETS): 1842 $(Q)$(MAKE) $(build)=Documentation $@ 1843 1844 1845# Rust targets 1846# --------------------------------------------------------------------------- 1847 1848# "Is Rust available?" target 1849PHONY += rustavailable 1850rustavailable: 1851 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1852 1853# Documentation target 1854# 1855# Using the singular to avoid running afoul of `no-dot-config-targets`. 1856PHONY += rustdoc 1857rustdoc: prepare 1858 $(Q)$(MAKE) $(build)=rust $@ 1859 1860# Testing target 1861PHONY += rusttest 1862rusttest: prepare 1863 $(Q)$(MAKE) $(build)=rust $@ 1864 1865# Formatting targets 1866# 1867# Generated files as well as vendored crates are skipped. 1868PHONY += rustfmt rustfmtcheck 1869 1870rustfmt: 1871 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1872 \( \ 1873 -path $(srctree)/rust/proc-macro2 \ 1874 -o -path $(srctree)/rust/quote \ 1875 -o -path $(srctree)/rust/syn \ 1876 \) -prune -o \ 1877 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1878 | xargs $(RUSTFMT) $(rustfmt_flags) 1879 1880rustfmtcheck: rustfmt_flags = --check 1881rustfmtcheck: rustfmt 1882 1883# Misc 1884# --------------------------------------------------------------------------- 1885 1886PHONY += misc-check 1887misc-check: 1888 $(Q)$(srctree)/scripts/misc-check 1889 1890all: misc-check 1891 1892PHONY += scripts_gdb 1893scripts_gdb: prepare0 1894 $(Q)$(MAKE) $(build)=scripts/gdb 1895 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1896 1897ifdef CONFIG_GDB_SCRIPTS 1898all: scripts_gdb 1899endif 1900 1901else # KBUILD_EXTMOD 1902 1903filechk_kernel.release = echo $(KERNELRELEASE) 1904 1905### 1906# External module support. 1907# When building external modules the kernel used as basis is considered 1908# read-only, and no consistency checks are made and the make 1909# system is not used on the basis kernel. If updates are required 1910# in the basis kernel ordinary make commands (without M=...) must be used. 1911 1912# We are always building only modules. 1913KBUILD_BUILTIN := 1914KBUILD_MODULES := y 1915 1916build-dir := . 1917 1918clean-dirs := . 1919clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1920 1921PHONY += prepare 1922# now expand this into a simple variable to reduce the cost of shell evaluations 1923prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1924prepare: 1925 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1926 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1927 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1928 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1929 fi 1930 1931PHONY += help 1932help: 1933 @echo ' Building external modules.' 1934 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1935 @echo '' 1936 @echo ' modules - default target, build the module(s)' 1937 @echo ' modules_install - install the module' 1938 @echo ' clean - remove generated files in module directory only' 1939 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1940 @echo '' 1941 1942ifndef CONFIG_MODULES 1943modules modules_install: __external_modules_error 1944__external_modules_error: 1945 @echo >&2 '***' 1946 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1947 @echo >&2 '*** You cannot build or install external modules.' 1948 @echo >&2 '***' 1949 @false 1950endif 1951 1952endif # KBUILD_EXTMOD 1953 1954# --------------------------------------------------------------------------- 1955# Modules 1956 1957PHONY += modules modules_install modules_sign modules_prepare 1958 1959modules_install: 1960 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1961 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1962 1963ifeq ($(CONFIG_MODULE_SIG),y) 1964# modules_sign is a subset of modules_install. 1965# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1966modules_sign: modules_install 1967 @: 1968else 1969modules_sign: 1970 @echo >&2 '***' 1971 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1972 @echo >&2 '***' 1973 @false 1974endif 1975 1976ifdef CONFIG_MODULES 1977 1978modules.order: $(build-dir) 1979 @: 1980 1981# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1982# This is solely useful to speed up test compiles. 1983modules: modpost 1984ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1986endif 1987 1988PHONY += modules_check 1989modules_check: modules.order 1990 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1991 1992else # CONFIG_MODULES 1993 1994modules: 1995 @: 1996 1997KBUILD_MODULES := 1998 1999endif # CONFIG_MODULES 2000 2001PHONY += modpost 2002modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2003 $(if $(KBUILD_MODULES), modules_check) 2004 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2005 2006# Single targets 2007# --------------------------------------------------------------------------- 2008# To build individual files in subdirectories, you can do like this: 2009# 2010# make foo/bar/baz.s 2011# 2012# The supported suffixes for single-target are listed in 'single-targets' 2013# 2014# To build only under specific subdirectories, you can do like this: 2015# 2016# make foo/bar/baz/ 2017 2018ifdef single-build 2019 2020# .ko is special because modpost is needed 2021single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2022single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2023 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2024 2025$(single-ko): single_modules 2026 @: 2027$(single-no-ko): $(build-dir) 2028 @: 2029 2030# Remove modules.order when done because it is not the real one. 2031PHONY += single_modules 2032single_modules: $(single-no-ko) modules_prepare 2033 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2035ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2036 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2037endif 2038 $(Q)rm -f modules.order 2039 2040single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2041 2042KBUILD_MODULES := y 2043 2044endif 2045 2046prepare: outputmakefile 2047 2048# Preset locale variables to speed up the build process. Limit locale 2049# tweaks to this spot to avoid wrong language settings when running 2050# make menuconfig etc. 2051# Error messages still appears in the original language 2052PHONY += $(build-dir) 2053$(build-dir): prepare 2054 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2055 2056clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2057PHONY += $(clean-dirs) clean 2058$(clean-dirs): 2059 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2060 2061clean: $(clean-dirs) 2062 $(call cmd,rmfiles) 2063 @find . $(RCS_FIND_IGNORE) \ 2064 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2065 -o -name '*.ko.*' \ 2066 -o -name '*.dtb' -o -name '*.dtbo' \ 2067 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2068 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2069 -o -name '*.dwo' -o -name '*.lst' \ 2070 -o -name '*.su' -o -name '*.mod' \ 2071 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2072 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2073 -o -name '*.asn1.[ch]' \ 2074 -o -name '*.symtypes' -o -name 'modules.order' \ 2075 -o -name '*.c.[012]*.*' \ 2076 -o -name '*.ll' \ 2077 -o -name '*.gcno' \ 2078 \) -type f -print \ 2079 -o -name '.tmp_*' -print \ 2080 | xargs rm -rf 2081 2082# Generate tags for editors 2083# --------------------------------------------------------------------------- 2084quiet_cmd_tags = GEN $@ 2085 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2086 2087tags TAGS cscope gtags: FORCE 2088 $(call cmd,tags) 2089 2090# Generate rust-project.json (a file that describes the structure of non-Cargo 2091# Rust projects) for rust-analyzer (an implementation of the Language Server 2092# Protocol). 2093PHONY += rust-analyzer 2094rust-analyzer: 2095 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2096ifdef KBUILD_EXTMOD 2097# FIXME: external modules must not descend into a sub-directory of the kernel 2098 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2099else 2100 $(Q)$(MAKE) $(build)=rust $@ 2101endif 2102 2103# Script to generate missing namespace dependencies 2104# --------------------------------------------------------------------------- 2105 2106PHONY += nsdeps 2107nsdeps: export KBUILD_NSDEPS=1 2108nsdeps: modules 2109 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2110 2111# Clang Tooling 2112# --------------------------------------------------------------------------- 2113 2114quiet_cmd_gen_compile_commands = GEN $@ 2115 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2116 2117compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2118 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2119 $(if $(CONFIG_MODULES), modules.order) FORCE 2120 $(call if_changed,gen_compile_commands) 2121 2122targets += compile_commands.json 2123 2124PHONY += clang-tidy clang-analyzer 2125 2126ifdef CONFIG_CC_IS_CLANG 2127quiet_cmd_clang_tools = CHECK $< 2128 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2129 2130clang-tidy clang-analyzer: compile_commands.json 2131 $(call cmd,clang_tools) 2132else 2133clang-tidy clang-analyzer: 2134 @echo "$@ requires CC=clang" >&2 2135 @false 2136endif 2137 2138# Scripts to check various things for consistency 2139# --------------------------------------------------------------------------- 2140 2141PHONY += includecheck versioncheck coccicheck 2142 2143includecheck: 2144 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2145 -name '*.[hcS]' -type f -print | sort \ 2146 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2147 2148versioncheck: 2149 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2150 -name '*.[hcS]' -type f -print | sort \ 2151 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2152 2153coccicheck: 2154 $(Q)$(BASH) $(srctree)/scripts/$@ 2155 2156PHONY += checkstack kernelrelease kernelversion image_name 2157 2158# UML needs a little special treatment here. It wants to use the host 2159# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2160# else wants $(ARCH), including people doing cross-builds, which means 2161# that $(SUBARCH) doesn't work here. 2162ifeq ($(ARCH), um) 2163CHECKSTACK_ARCH := $(SUBARCH) 2164else 2165CHECKSTACK_ARCH := $(ARCH) 2166endif 2167MINSTACKSIZE ?= 100 2168checkstack: 2169 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2170 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2171 2172kernelrelease: 2173 @$(filechk_kernel.release) 2174 2175kernelversion: 2176 @echo $(KERNELVERSION) 2177 2178image_name: 2179 @echo $(KBUILD_IMAGE) 2180 2181PHONY += run-command 2182run-command: 2183 $(Q)$(KBUILD_RUN_COMMAND) 2184 2185quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2186 cmd_rmfiles = rm -rf $(rm-files) 2187 2188# read saved command lines for existing targets 2189existing-targets := $(wildcard $(sort $(targets))) 2190 2191-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2192 2193endif # config-build 2194endif # mixed-build 2195endif # need-sub-make 2196 2197PHONY += FORCE 2198FORCE: 2199 2200# Declare the contents of the PHONY variable as phony. We keep that 2201# information in a variable so we can use it in if_changed and friends. 2202.PHONY: $(PHONY) 2203