1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 1 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 kconfig-sym-check \ 297 $(version_h) headers headers_% archheaders archscripts \ 298 %asm-generic kernelversion %src-pkg dt_binding_check \ 299 dt_style_selftest \ 300 outputmakefile rustavailable rustfmt rustfmtcheck \ 301 run-command 302no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 303 image_name 304single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 305 306config-build := 307mixed-build := 308need-config := 1 309may-sync-config := 1 310single-build := 311 312ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 313 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 314 need-config := 315 endif 316endif 317 318ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 319 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 320 may-sync-config := 321 endif 322endif 323 324need-compiler := $(may-sync-config) 325 326ifneq ($(KBUILD_EXTMOD),) 327 may-sync-config := 328endif 329 330ifeq ($(KBUILD_EXTMOD),) 331 ifneq ($(filter %config,$(MAKECMDGOALS)),) 332 config-build := 1 333 ifneq ($(words $(MAKECMDGOALS)),1) 334 mixed-build := 1 335 endif 336 endif 337endif 338 339# We cannot build single targets and the others at the same time 340ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 341 single-build := 1 342 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 343 mixed-build := 1 344 endif 345endif 346 347# For "make -j clean all", "make -j mrproper defconfig all", etc. 348ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 349 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 350 mixed-build := 1 351 endif 352endif 353 354# install and modules_install need also be processed one by one 355ifneq ($(filter install,$(MAKECMDGOALS)),) 356 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 357 mixed-build := 1 358 endif 359endif 360 361ifdef mixed-build 362# =========================================================================== 363# We're called with mixed targets (*config and build targets). 364# Handle them one by one. 365 366PHONY += $(MAKECMDGOALS) __build_one_by_one 367 368$(MAKECMDGOALS): __build_one_by_one 369 @: 370 371__build_one_by_one: 372 $(Q)set -e; \ 373 for i in $(MAKECMDGOALS); do \ 374 $(MAKE) -f $(srctree)/Makefile $$i; \ 375 done 376 377else # !mixed-build 378 379include $(srctree)/scripts/Kbuild.include 380 381# Read KERNELRELEASE from include/config/kernel.release (if it exists) 382KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 383KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 384export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 385 386include $(srctree)/scripts/subarch.include 387 388# Cross compiling and selecting different set of gcc/bin-utils 389# --------------------------------------------------------------------------- 390# 391# When performing cross compilation for other architectures ARCH shall be set 392# to the target architecture. (See arch/* for the possibilities). 393# ARCH can be set during invocation of make: 394# make ARCH=arm64 395# Another way is to have ARCH set in the environment. 396# The default ARCH is the host where make is executed. 397 398# CROSS_COMPILE specify the prefix used for all executables used 399# during compilation. Only gcc and related bin-utils executables 400# are prefixed with $(CROSS_COMPILE). 401# CROSS_COMPILE can be set on the command line 402# make CROSS_COMPILE=aarch64-linux-gnu- 403# Alternatively CROSS_COMPILE can be set in the environment. 404# Default value for CROSS_COMPILE is not to prefix executables 405# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 406ARCH ?= $(SUBARCH) 407 408# Architecture as present in compile.h 409UTS_MACHINE := $(ARCH) 410SRCARCH := $(ARCH) 411 412# Additional ARCH settings for x86 413ifeq ($(ARCH),i386) 414 SRCARCH := x86 415endif 416ifeq ($(ARCH),x86_64) 417 SRCARCH := x86 418endif 419 420# Additional ARCH settings for sparc 421ifeq ($(ARCH),sparc32) 422 SRCARCH := sparc 423endif 424ifeq ($(ARCH),sparc64) 425 SRCARCH := sparc 426endif 427 428# Additional ARCH settings for parisc 429ifeq ($(ARCH),parisc64) 430 SRCARCH := parisc 431endif 432 433export cross_compiling := 434ifneq ($(SRCARCH),$(SUBARCH)) 435cross_compiling := 1 436endif 437 438KCONFIG_CONFIG ?= .config 439export KCONFIG_CONFIG 440 441# SHELL used by kbuild 442CONFIG_SHELL := sh 443 444HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 445HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 446HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 447 448ifneq ($(LLVM),) 449ifneq ($(filter %/,$(LLVM)),) 450LLVM_PREFIX := $(LLVM) 451else ifneq ($(filter -%,$(LLVM)),) 452LLVM_SUFFIX := $(LLVM) 453else ifneq ($(LLVM),1) 454$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 455endif 456 457HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 458HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 459else 460HOSTCC = gcc 461HOSTCXX = g++ 462endif 463HOSTRUSTC = rustc 464HOSTPKG_CONFIG = pkg-config 465 466# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 467# has a logic to call it 468KERNELDOC = $(srctree)/tools/docs/kernel-doc 469export KERNELDOC 470 471KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 472 -O2 -fomit-frame-pointer -std=gnu11 473KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 474KBUILD_USERLDFLAGS := $(USERLDFLAGS) 475 476# These flags apply to all Rust code in the tree, including the kernel and 477# host programs. 478export rust_common_flags := --edition=2021 \ 479 -Zbinary_dep_depinfo=y \ 480 -Astable_features \ 481 -Aunused_features \ 482 -Dnon_ascii_idents \ 483 -Dunsafe_op_in_unsafe_fn \ 484 -Wmissing_docs \ 485 -Wrust_2018_idioms \ 486 -Wunreachable_pub \ 487 -Wclippy::all \ 488 -Wclippy::as_ptr_cast_mut \ 489 -Wclippy::as_underscore \ 490 -Wclippy::cast_lossless \ 491 -Aclippy::collapsible_if \ 492 -Aclippy::collapsible_match \ 493 -Wclippy::ignored_unit_patterns \ 494 -Aclippy::incompatible_msrv \ 495 -Wclippy::mut_mut \ 496 -Wclippy::needless_bitwise_bool \ 497 -Aclippy::needless_lifetimes \ 498 -Wclippy::no_mangle_with_rust_abi \ 499 -Wclippy::ptr_as_ptr \ 500 -Wclippy::ptr_cast_constness \ 501 -Wclippy::ref_as_ptr \ 502 -Wclippy::undocumented_unsafe_blocks \ 503 -Aclippy::uninlined_format_args \ 504 -Wclippy::unnecessary_safety_comment \ 505 -Wclippy::unnecessary_safety_doc \ 506 -Wrustdoc::missing_crate_level_docs \ 507 -Wrustdoc::unescaped_backticks 508 509KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 510 $(HOSTCFLAGS) -I $(srctree)/scripts/include 511KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 512 -I $(srctree)/scripts/include 513KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 514 -Zallow-features= 515KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 516KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 517KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 518 519# Make variables (CC, etc...) 520CPP = $(CC) -E 521ifneq ($(LLVM),) 522CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 523LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 524AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 525LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 526NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 527OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 528OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 529READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 530STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 531else 532CC = $(CROSS_COMPILE)gcc 533LD = $(CROSS_COMPILE)ld 534AR = $(CROSS_COMPILE)ar 535NM = $(CROSS_COMPILE)nm 536OBJCOPY = $(CROSS_COMPILE)objcopy 537OBJDUMP = $(CROSS_COMPILE)objdump 538READELF = $(CROSS_COMPILE)readelf 539STRIP = $(CROSS_COMPILE)strip 540endif 541RUSTC = rustc 542RUSTDOC = rustdoc 543RUSTFMT = rustfmt 544CLIPPY_DRIVER = clippy-driver 545BINDGEN = bindgen 546PAHOLE = pahole 547RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 548LEX = flex 549YACC = bison 550AWK = awk 551INSTALLKERNEL := installkernel 552PERL = perl 553PYTHON3 = python3 554CHECK = sparse 555BASH = bash 556KGZIP = gzip 557KBZIP2 = bzip2 558KLZOP = lzop 559LZMA = lzma 560LZ4 = lz4 561XZ = xz 562ZSTD = zstd 563TAR = tar 564 565CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 566 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 567NOSTDINC_FLAGS := 568CFLAGS_MODULE = 569RUSTFLAGS_MODULE = 570AFLAGS_MODULE = 571LDFLAGS_MODULE = 572CFLAGS_KERNEL = 573RUSTFLAGS_KERNEL = 574AFLAGS_KERNEL = 575LDFLAGS_vmlinux = 576 577# Use USERINCLUDE when you must reference the UAPI directories only. 578USERINCLUDE := \ 579 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 580 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 581 -I$(srctree)/include/uapi \ 582 -I$(objtree)/include/generated/uapi \ 583 -include $(srctree)/include/linux/compiler-version.h \ 584 -include $(srctree)/include/linux/kconfig.h 585 586# Use LINUXINCLUDE when you must reference the include/ directory. 587# Needed to be compatible with the O= option 588LINUXINCLUDE := \ 589 -I$(srctree)/arch/$(SRCARCH)/include \ 590 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 591 -I$(srctree)/include \ 592 -I$(objtree)/include \ 593 $(USERINCLUDE) 594 595KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 596 597KBUILD_CFLAGS := 598KBUILD_CFLAGS += -fshort-wchar 599KBUILD_CFLAGS += -funsigned-char 600KBUILD_CFLAGS += -fno-common 601KBUILD_CFLAGS += -fno-PIE 602KBUILD_CFLAGS += -fno-strict-aliasing 603 604KBUILD_CPPFLAGS := -D__KERNEL__ 605KBUILD_RUSTFLAGS := $(rust_common_flags) \ 606 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 607 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 608 -Csymbol-mangling-version=v0 \ 609 -Crelocation-model=static \ 610 -Zfunction-sections=n \ 611 -Wclippy::float_arithmetic 612KBUILD_RUSTFLAGS_OPTION_CHKS := 613 614KBUILD_AFLAGS_KERNEL := 615KBUILD_CFLAGS_KERNEL := 616KBUILD_RUSTFLAGS_KERNEL := 617KBUILD_AFLAGS_MODULE := -DMODULE 618KBUILD_CFLAGS_MODULE := -DMODULE 619KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 620KBUILD_LDFLAGS_MODULE := 621KBUILD_LDFLAGS := 622CLANG_FLAGS := 623 624ifeq ($(KBUILD_CLIPPY),1) 625 RUSTC_OR_CLIPPY_QUIET := CLIPPY 626 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 627else 628 RUSTC_OR_CLIPPY_QUIET := RUSTC 629 RUSTC_OR_CLIPPY = $(RUSTC) 630endif 631 632# Allows the usage of unstable features in stable compilers. 633export RUSTC_BOOTSTRAP := 1 634 635# Allows finding `.clippy.toml` in out-of-srctree builds. 636export CLIPPY_CONF_DIR := $(srctree) 637 638export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 639export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 640export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 641export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 642export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 643export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 644export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 645export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 646 647export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 648export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 649export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 650export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 651export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 652export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 653 654# Files to ignore in find ... statements 655 656export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 657 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 658 -prune -o 659 660# =========================================================================== 661# Rules shared between *config targets and build targets 662 663# Basic helpers built in scripts/basic/ 664PHONY += scripts_basic 665scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 666scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 667scripts_basic: 668 $(Q)$(MAKE) $(build)=scripts/basic 669 670PHONY += outputmakefile 671ifdef building_out_of_srctree 672# Before starting out-of-tree build, make sure the source tree is clean. 673# outputmakefile generates a Makefile in the output directory, if using a 674# separate output directory. This allows convenient use of make in the 675# output directory. 676# At the same time when output Makefile generated, generate .gitignore to 677# ignore whole output directory 678 679ifdef KBUILD_EXTMOD 680print_env_for_makefile = \ 681 echo "export KBUILD_OUTPUT = $(objtree)"; \ 682 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 683 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 684else 685print_env_for_makefile = \ 686 echo "export KBUILD_OUTPUT = $(CURDIR)" 687endif 688 689filechk_makefile = { \ 690 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 691 $(print_env_for_makefile); \ 692 echo "include $(abs_srctree)/Makefile"; \ 693 } 694 695$(objtree)/Makefile: FORCE 696 $(call filechk,makefile) 697 698# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 699PHONY += $(objtree)/Makefile 700 701outputmakefile: $(objtree)/Makefile 702ifeq ($(KBUILD_EXTMOD),) 703 @if [ -f $(srctree)/.config -o \ 704 -d $(srctree)/include/config -o \ 705 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 706 echo >&2 "***"; \ 707 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 708 echo >&2 "*** in $(abs_srctree)";\ 709 echo >&2 "***"; \ 710 false; \ 711 fi 712else 713 @if [ -f $(srcroot)/modules.order ]; then \ 714 echo >&2 "***"; \ 715 echo >&2 "*** The external module source tree is not clean."; \ 716 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 717 echo >&2 "***"; \ 718 false; \ 719 fi 720endif 721 $(Q)ln -fsn $(srcroot) source 722 $(Q)test -e .gitignore || \ 723 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 724endif 725 726# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 727# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 728# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 729# Kconfig (so they need export), and from include/config/auto.conf.cmd to 730# detect the version changes between builds. 731CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 732RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 733PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 734 735ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 736include $(srctree)/scripts/Makefile.clang 737endif 738 739# Include this also for config targets because some architectures need 740# cc-cross-prefix to determine CROSS_COMPILE. 741ifdef need-compiler 742include $(srctree)/scripts/Makefile.compiler 743endif 744 745ifdef config-build 746# =========================================================================== 747# *config targets only - make sure prerequisites are updated, and descend 748# in scripts/kconfig to make the *config target 749 750# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 751# KBUILD_DEFCONFIG may point out an alternative default configuration 752# used for 'make defconfig' 753include $(srctree)/arch/$(SRCARCH)/Makefile 754export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 755 756config: outputmakefile scripts_basic FORCE 757 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 758 759%config: outputmakefile scripts_basic FORCE 760 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 761 762else #!config-build 763# =========================================================================== 764# Build targets only - this includes vmlinux, arch-specific targets, clean 765# targets and others. In general all targets except *config targets. 766 767# If building an external module we do not care about the all: rule 768# but instead __all depend on modules 769PHONY += all 770ifeq ($(KBUILD_EXTMOD),) 771__all: all 772else 773__all: modules 774endif 775 776targets := 777 778# Decide whether to build built-in, modular, or both. 779# Normally, just do built-in. 780 781KBUILD_MODULES := 782KBUILD_BUILTIN := y 783 784# If we have only "make modules", don't compile built-in objects. 785ifeq ($(MAKECMDGOALS),modules) 786 KBUILD_BUILTIN := 787endif 788 789# If we have "make <whatever> modules", compile modules 790# in addition to whatever we do anyway. 791# Just "make" or "make all" shall build modules as well 792 793ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 794 KBUILD_MODULES := y 795endif 796 797ifeq ($(MAKECMDGOALS),) 798 KBUILD_MODULES := y 799endif 800 801export KBUILD_MODULES KBUILD_BUILTIN 802 803ifdef need-config 804include $(objtree)/include/config/auto.conf 805endif 806 807CC_FLAGS_DIALECT := -std=gnu11 808# Allow including a tagged struct or union anonymously in another struct/union. 809CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 810# Clang enables warnings about GNU and Microsoft extensions by default, disable 811# them because this is expected with the above options. 812ifdef CONFIG_CC_IS_CLANG 813CC_FLAGS_DIALECT += -Wno-gnu 814CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 815endif 816export CC_FLAGS_DIALECT 817KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 818 819ifeq ($(KBUILD_EXTMOD),) 820# Objects we will link into vmlinux / subdirs we need to visit 821core-y := 822drivers-y := 823libs-y := lib/ 824endif # KBUILD_EXTMOD 825 826# The all: target is the default when no target is given on the 827# command line. 828# This allow a user to issue only 'make' to build a kernel including modules 829# Defaults to vmlinux, but the arch makefile usually adds further targets 830all: vmlinux 831 832# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 833ifdef CONFIG_FUNCTION_TRACER 834 CC_FLAGS_FTRACE := -pg 835endif 836 837ifdef CONFIG_TRACEPOINTS 838# To check for unused tracepoints (tracepoints that are defined but never 839# called), run with: 840# 841# make UT=1 842# 843# Each unused tracepoints can take up to 5KB of memory in the running kernel. 844# It is best to remove any that are not used. 845# 846# This command line option will be removed when all current unused 847# tracepoints are removed. 848 849ifeq ("$(origin UT)", "command line") 850 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 851endif 852endif # CONFIG_TRACEPOINTS 853 854export WARN_ON_UNUSED_TRACEPOINTS 855 856# Per-version Rust flags. These are like `rust_common_flags`, but may 857# depend on the Rust compiler version (e.g. using `rustc-min-version`). 858# 859# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 860# include bitmasking and shift operations. However, because it generated 861# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 862# lint which is not enabled by default. 863rust_common_flags_per_version := \ 864 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 865 866rust_common_flags += $(rust_common_flags_per_version) 867KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 868KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 869 870include $(srctree)/arch/$(SRCARCH)/Makefile 871 872ifdef need-config 873ifdef may-sync-config 874# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 875# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 876# because some architectures define CROSS_COMPILE there. 877include include/config/auto.conf.cmd 878 879$(KCONFIG_CONFIG): 880 @echo >&2 '***' 881 @echo >&2 '*** Configuration file "$@" not found!' 882 @echo >&2 '***' 883 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 884 @echo >&2 '*** "make menuconfig" or "make xconfig").' 885 @echo >&2 '***' 886 @/bin/false 887 888# The actual configuration files used during the build are stored in 889# include/generated/ and include/config/. Update them if .config is newer than 890# include/config/auto.conf (which mirrors .config). 891# 892# This exploits the 'multi-target pattern rule' trick. 893# The syncconfig should be executed only once to make all the targets. 894# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 895# 896# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 897# so you cannot notice that Kconfig is waiting for the user input. 898%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 899 $(Q)$(kecho) " SYNC $@" 900 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 901else # !may-sync-config 902# External modules and some install targets need include/generated/autoconf.h 903# and include/config/auto.conf but do not care if they are up-to-date. 904# Use auto.conf to show the error message 905 906checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 907missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 908 909ifdef missing-configs 910PHONY += $(objtree)/include/config/auto.conf 911 912$(objtree)/include/config/auto.conf: 913 @echo >&2 '***' 914 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 915 @printf >&2 '*** - %s\n' $(missing-configs) 916 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 917 @echo >&2 '***' 918 @/bin/false 919endif 920 921endif # may-sync-config 922endif # need-config 923 924KBUILD_CFLAGS += -fno-delete-null-pointer-checks 925 926ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 927KBUILD_CFLAGS += -O2 928KBUILD_RUSTFLAGS += -Copt-level=2 929else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 930KBUILD_CFLAGS += -Os 931KBUILD_RUSTFLAGS += -Copt-level=s 932endif 933 934# Always set `debug-assertions` and `overflow-checks` because their default 935# depends on `opt-level` and `debug-assertions`, respectively. 936KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 937KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 938 939# Tell gcc to never replace conditional load with a non-conditional one 940ifdef CONFIG_CC_IS_GCC 941# gcc-10 renamed --param=allow-store-data-races=0 to 942# -fno-allow-store-data-races. 943KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 944KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 945endif 946 947ifdef CONFIG_READABLE_ASM 948# Disable optimizations that make assembler listings hard to read. 949# reorder blocks reorders the control in the function 950# ipa clone creates specialized cloned functions 951# partial inlining inlines only parts of functions 952KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 953endif 954 955stackp-flags-y := -fno-stack-protector 956stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 957stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 958 959KBUILD_CFLAGS += $(stackp-flags-y) 960 961ifdef CONFIG_FRAME_POINTER 962KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 963KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 964else 965# Some targets (ARM with Thumb2, for example), can't be built with frame 966# pointers. For those, we don't have FUNCTION_TRACER automatically 967# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 968# incompatible with -fomit-frame-pointer with current GCC, so we don't use 969# -fomit-frame-pointer with FUNCTION_TRACER. 970# In the Rust target specification, "frame-pointer" is set explicitly 971# to "may-omit". 972ifndef CONFIG_FUNCTION_TRACER 973KBUILD_CFLAGS += -fomit-frame-pointer 974endif 975endif 976 977# Initialize all stack variables with a 0xAA pattern. 978ifdef CONFIG_INIT_STACK_ALL_PATTERN 979KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 980endif 981 982# Initialize all stack variables with a zero value. 983ifdef CONFIG_INIT_STACK_ALL_ZERO 984KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 985ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 986# https://github.com/llvm/llvm-project/issues/44842 987CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 988export CC_AUTO_VAR_INIT_ZERO_ENABLER 989KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 990endif 991endif 992 993ifdef CONFIG_KMALLOC_PARTITION_TYPED 994# KMALLOC_PARTITION_CACHES_NR + 1 995KBUILD_CFLAGS += -falloc-token-max=16 996endif 997 998ifdef CONFIG_CC_IS_CLANG 999ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1000KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1001endif 1002endif 1003 1004# Explicitly clear padding bits during variable initialization 1005KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1006 1007# While VLAs have been removed, GCC produces unreachable stack probes 1008# for the randomize_kstack_offset feature. Disable it for all compilers. 1009KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1010 1011# Get details on warnings generated due to GCC value tracking. 1012KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1013 1014# Show inlining notes for __attribute__((warning/error)) call chains. 1015# GCC supports this unconditionally while Clang 23+ provides a flag. 1016KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1017 1018# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1019ifdef CONFIG_ZERO_CALL_USED_REGS 1020KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1021endif 1022 1023ifdef CONFIG_FUNCTION_TRACER 1024ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1025 CC_FLAGS_FTRACE += -mrecord-mcount 1026 ifdef CONFIG_HAVE_NOP_MCOUNT 1027 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1028 CC_FLAGS_FTRACE += -mnop-mcount 1029 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1030 endif 1031 endif 1032endif 1033ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1034 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1035 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1036 endif 1037endif 1038ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1039 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1040 BUILD_C_RECORDMCOUNT := y 1041 export BUILD_C_RECORDMCOUNT 1042 endif 1043endif 1044ifdef CONFIG_HAVE_FENTRY 1045 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1046 ifeq ($(call cc-option-yn, -mfentry),y) 1047 CC_FLAGS_FTRACE += -mfentry 1048 CC_FLAGS_USING += -DCC_USING_FENTRY 1049 endif 1050endif 1051export CC_FLAGS_FTRACE 1052KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1053KBUILD_AFLAGS += $(CC_FLAGS_USING) 1054endif 1055 1056# We trigger additional mismatches with less inlining 1057ifdef CONFIG_DEBUG_SECTION_MISMATCH 1058KBUILD_CFLAGS += -fno-inline-functions-called-once 1059endif 1060 1061# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1062ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1063KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1064KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1065LDFLAGS_vmlinux += --gc-sections 1066endif 1067 1068ifdef CONFIG_SHADOW_CALL_STACK 1069ifndef CONFIG_DYNAMIC_SCS 1070CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1071KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1072KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1073endif 1074export CC_FLAGS_SCS 1075endif 1076 1077ifdef CONFIG_LTO_CLANG 1078ifdef CONFIG_LTO_CLANG_FULL 1079CC_FLAGS_LTO := -flto 1080else 1081CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1082 1083# These LLVM options were initially added with only in-process ThinLTO 1084# support, so avoid distributed ThinLTO support for now. 1085ifdef CONFIG_LTO_CLANG_THIN 1086KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1087endif 1088endif 1089CC_FLAGS_LTO += -fvisibility=hidden 1090 1091# Limit inlining across translation units to reduce binary size 1092KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1093endif 1094 1095ifdef CONFIG_LTO 1096KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1097KBUILD_AFLAGS += -fno-lto 1098export CC_FLAGS_LTO 1099endif 1100 1101ifdef CONFIG_CFI 1102CC_FLAGS_CFI := -fsanitize=kcfi 1103ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1104 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1105endif 1106ifdef CONFIG_FINEIBT_BHI 1107 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1108endif 1109ifdef CONFIG_RUST 1110 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1111 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1112 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1113 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1114 export RUSTC_FLAGS_CFI 1115endif 1116KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1117export CC_FLAGS_CFI 1118endif 1119 1120# Architectures can define flags to add/remove for floating-point support 1121CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1122export CC_FLAGS_FPU 1123export CC_FLAGS_NO_FPU 1124 1125ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1126# Set the minimal function alignment. Use the newer GCC option 1127# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1128# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1129ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1130KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1131else 1132KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1133endif 1134endif 1135 1136# arch Makefile may override CC so keep this after arch Makefile is included 1137NOSTDINC_FLAGS += -nostdinc 1138 1139# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1140# the kernel uses only C99 flexible arrays for dynamically sized trailing 1141# arrays. Enforce this for everything that may examine structure sizes and 1142# perform bounds checking. 1143KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1144 1145# disable invalid "can't wrap" optimizations for signed / pointers 1146KBUILD_CFLAGS += -fno-strict-overflow 1147 1148# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1149KBUILD_CFLAGS += -fno-stack-check 1150 1151# conserve stack if available 1152ifdef CONFIG_CC_IS_GCC 1153KBUILD_CFLAGS += -fconserve-stack 1154endif 1155 1156# Ensure compilers do not transform certain loops into calls to wcslen() 1157KBUILD_CFLAGS += -fno-builtin-wcslen 1158 1159CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1160ifdef CONFIG_CC_IS_GCC 1161CFLAGS_GCOV += -fno-tree-loop-im 1162# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1163# Only enable if -fprofile-update=prefer-atomic does not introduce new 1164# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1165CFLAGS_GCOV += $(call try-run,\ 1166 echo 'long long x; void f(void){x++;}' | \ 1167 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1168 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1169 echo 'long long x; void f(void){x++;}' | \ 1170 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1171 -ftest-coverage -fprofile-update=prefer-atomic \ 1172 -x c - -c -o "$$TMP" && \ 1173 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1174 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1175 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1176 -fprofile-update=prefer-atomic) 1177endif 1178export CFLAGS_GCOV 1179 1180# change __FILE__ to the relative path to the source directory 1181ifdef building_out_of_srctree 1182KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1183ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1184KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1185endif 1186endif 1187 1188# include additional Makefiles when needed 1189include-y := scripts/Makefile.warn 1190include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1191include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1192include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1193include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1194include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1195include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1196include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1197include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1198include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1199include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1200include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1201include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1202include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1203 1204include $(addprefix $(srctree)/, $(include-y)) 1205 1206# scripts/Makefile.gcc-plugins is intentionally included last. 1207# Do not add $(call cc-option,...) below this line. When you build the kernel 1208# from the clean source tree, the GCC plugins do not exist at this point. 1209 1210# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1211KBUILD_CPPFLAGS += $(KCPPFLAGS) 1212KBUILD_AFLAGS += $(KAFLAGS) 1213KBUILD_CFLAGS += $(KCFLAGS) 1214KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1215 1216KBUILD_LDFLAGS_MODULE += --build-id=sha1 1217LDFLAGS_vmlinux += --build-id=sha1 1218 1219KBUILD_LDFLAGS += -z noexecstack 1220ifeq ($(CONFIG_LD_IS_BFD),y) 1221KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1222endif 1223 1224ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1225LDFLAGS_vmlinux += -X 1226endif 1227 1228ifeq ($(CONFIG_RELR),y) 1229# ld.lld before 15 did not support -z pack-relative-relocs. 1230LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1231endif 1232 1233# We never want expected sections to be placed heuristically by the 1234# linker. All sections should be explicitly named in the linker script. 1235ifdef CONFIG_LD_ORPHAN_WARN 1236LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1237endif 1238 1239ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1240LDFLAGS_vmlinux += --emit-relocs --discard-none 1241endif 1242 1243# Align the architecture of userspace programs with the kernel 1244USERFLAGS_FROM_KERNEL := --target=% 1245 1246ifdef CONFIG_ARCH_USERFLAGS 1247KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1248KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1249else 1250# If not overridden also inherit the bit size 1251USERFLAGS_FROM_KERNEL += -m32 -m64 1252endif 1253 1254KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1255KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1256 1257# userspace programs are linked via the compiler, use the correct linker 1258ifdef CONFIG_CC_IS_CLANG 1259KBUILD_USERLDFLAGS += --ld-path=$(LD) 1260endif 1261 1262# make the checker run with the right architecture 1263CHECKFLAGS += --arch=$(ARCH) 1264 1265# insure the checker run with the right endianness 1266CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1267 1268# the checker needs the correct machine size 1269CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1270 1271# Validate the checker is available and functional 1272ifneq ($(KBUILD_CHECKSRC), 0) 1273 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1274 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1275 KBUILD_CHECKSRC = 0 1276 endif 1277endif 1278 1279# Default kernel image to build when no specific target is given. 1280# KBUILD_IMAGE may be overruled on the command line or 1281# set in the environment 1282# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1283# this default value 1284export KBUILD_IMAGE ?= vmlinux 1285 1286# 1287# INSTALL_PATH specifies where to place the updated kernel and system map 1288# images. Default is /boot, but you can set it to other values 1289export INSTALL_PATH ?= /boot 1290 1291# 1292# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1293# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1294# an argument if needed. Otherwise it defaults to the kernel install path 1295# 1296export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1297 1298# 1299# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1300# relocations required by build roots. This is not defined in the 1301# makefile but the argument can be passed to make if needed. 1302# 1303 1304MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1305export MODLIB 1306 1307PHONY += prepare0 1308 1309ifeq ($(KBUILD_EXTMOD),) 1310 1311build-dir := . 1312clean-dirs := $(sort . Documentation \ 1313 $(patsubst %/,%,$(filter %/, $(core-) \ 1314 $(drivers-) $(libs-)))) 1315 1316export ARCH_CORE := $(core-y) 1317export ARCH_LIB := $(filter %/, $(libs-y)) 1318export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1319# Externally visible symbols (used by link-vmlinux.sh) 1320 1321KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1322KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1323 1324export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1325export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1326 1327ifdef CONFIG_TRIM_UNUSED_KSYMS 1328# For the kernel to actually contain only the needed exported symbols, 1329# we have to build modules as well to determine what those symbols are. 1330KBUILD_MODULES := y 1331endif 1332 1333PHONY += vmlinux_a 1334vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1336 1337vmlinux.a: vmlinux_a 1338 @: 1339 1340PHONY += vmlinux_o 1341vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1342 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1343 1344vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1345 @: 1346 1347PHONY += vmlinux 1348# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1349# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1350# unrelated; the decompressors just happen to have the same base name, 1351# arch/*/boot/compressed/vmlinux. 1352# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1353# 1354# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1355# https://savannah.gnu.org/bugs/?61463 1356# For Make > 4.4, the following simple code will work: 1357# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1358vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1359vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1360vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1361 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1362 1363# The actual objects are generated when descending, 1364# make sure no implicit rule kicks in 1365$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1366 1367ifeq ($(origin KERNELRELEASE),file) 1368filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1369else 1370filechk_kernel.release = echo $(KERNELRELEASE) 1371endif 1372 1373# Store (new) KERNELRELEASE string in include/config/kernel.release 1374include/config/kernel.release: FORCE 1375 $(call filechk,kernel.release) 1376 1377# Additional helpers built in scripts/ 1378# Carefully list dependencies so we do not try to build scripts twice 1379# in parallel 1380PHONY += scripts 1381scripts: scripts_basic scripts_dtc 1382 $(Q)$(MAKE) $(build)=$(@) 1383 1384# Things we need to do before we recursively start building the kernel 1385# or the modules are listed in "prepare". 1386# A multi level approach is used. prepareN is processed before prepareN-1. 1387# archprepare is used in arch Makefiles and when processed asm symlink, 1388# version.h and scripts_basic is processed / created. 1389 1390PHONY += prepare archprepare 1391 1392archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1393 asm-generic $(version_h) include/generated/utsrelease.h \ 1394 include/generated/compile.h include/generated/autoconf.h \ 1395 include/generated/rustc_cfg remove-stale-files 1396 1397prepare0: archprepare 1398 $(Q)$(MAKE) $(build)=scripts/mod 1399 $(Q)$(MAKE) $(build)=. prepare 1400 1401# All the preparing.. 1402prepare: prepare0 1403ifdef CONFIG_RUST 1404 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1405 $(Q)$(MAKE) $(build)=rust 1406endif 1407 1408PHONY += remove-stale-files 1409remove-stale-files: 1410 $(Q)$(srctree)/scripts/remove-stale-files 1411 1412# Support for using generic headers in asm-generic 1413asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1414 1415PHONY += asm-generic uapi-asm-generic 1416asm-generic: uapi-asm-generic 1417 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1418 generic=include/asm-generic 1419uapi-asm-generic: 1420 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1421 generic=include/uapi/asm-generic 1422 1423# Generate some files 1424# --------------------------------------------------------------------------- 1425 1426# KERNELRELEASE can change from a few different places, meaning version.h 1427# needs to be updated, so this check is forced on all builds 1428 1429uts_len := 64 1430define filechk_utsrelease.h 1431 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1432 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1433 exit 1; \ 1434 fi; \ 1435 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1436endef 1437 1438define filechk_version.h 1439 if [ $(SUBLEVEL) -gt 255 ]; then \ 1440 echo \#define LINUX_VERSION_CODE $(shell \ 1441 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1442 else \ 1443 echo \#define LINUX_VERSION_CODE $(shell \ 1444 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1445 fi; \ 1446 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1447 ((c) > 255 ? 255 : (c)))'; \ 1448 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1449 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1450 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1451endef 1452 1453$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1454$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1455$(version_h): FORCE 1456 $(call filechk,version.h) 1457 1458include/generated/utsrelease.h: include/config/kernel.release FORCE 1459 $(call filechk,utsrelease.h) 1460 1461filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1462 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1463 1464include/generated/compile.h: FORCE 1465 $(call filechk,compile.h) 1466 1467PHONY += headerdep 1468headerdep: 1469 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1470 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1471 1472# --------------------------------------------------------------------------- 1473# Kernel headers 1474 1475#Default location for installed headers 1476export INSTALL_HDR_PATH = $(objtree)/usr 1477 1478quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1479 cmd_headers_install = \ 1480 mkdir -p $(INSTALL_HDR_PATH); \ 1481 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1482 usr/include $(INSTALL_HDR_PATH) 1483 1484PHONY += headers_install 1485headers_install: headers 1486 $(call cmd,headers_install) 1487 1488PHONY += archheaders archscripts 1489 1490hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1491 1492PHONY += headers 1493headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1494ifdef HEADER_ARCH 1495 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1496else 1497 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1498 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1499endif 1500 1501ifdef CONFIG_HEADERS_INSTALL 1502prepare: headers 1503endif 1504 1505PHONY += usr_gen_init_cpio 1506usr_gen_init_cpio: scripts_basic 1507 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1508 1509PHONY += scripts_unifdef 1510scripts_unifdef: scripts_basic 1511 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1512 1513PHONY += scripts_gen_packed_field_checks 1514scripts_gen_packed_field_checks: scripts_basic 1515 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1516 1517# --------------------------------------------------------------------------- 1518# Install 1519 1520# Many distributions have the custom install script, /sbin/installkernel. 1521# If DKMS is installed, 'make install' will eventually recurse back 1522# to this Makefile to build and install external modules. 1523# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1524 1525quiet_cmd_install = INSTALL $(INSTALL_PATH) 1526 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1527 1528# --------------------------------------------------------------------------- 1529# vDSO install 1530 1531PHONY += vdso_install 1532vdso_install: export INSTALL_FILES = $(vdso-install-y) 1533vdso_install: 1534 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1535 1536# --------------------------------------------------------------------------- 1537# Tools 1538 1539ifdef CONFIG_OBJTOOL 1540prepare: tools/objtool 1541endif 1542 1543ifdef CONFIG_BPF 1544ifdef CONFIG_DEBUG_INFO_BTF 1545prepare: tools/bpf/resolve_btfids 1546endif 1547endif 1548 1549# The tools build system is not a part of Kbuild and tends to introduce 1550# its own unique issues. If you need to integrate a new tool into Kbuild, 1551# please consider locating that tool outside the tools/ tree and using the 1552# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1553# here. See Documentation/kbuild/makefiles.rst for details. 1554 1555PHONY += resolve_btfids_clean 1556 1557resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1558 1559# tools/bpf/resolve_btfids directory might not exist 1560# in output directory, skip its clean in that case 1561resolve_btfids_clean: 1562ifneq ($(wildcard $(resolve_btfids_O)),) 1563 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1564endif 1565 1566PHONY += objtool_clean objtool_mrproper 1567 1568objtool_O = $(abspath $(objtree))/tools/objtool 1569 1570objtool_clean objtool_mrproper: 1571ifneq ($(wildcard $(objtool_O)),) 1572 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1573endif 1574 1575tools/: FORCE 1576 $(Q)mkdir -p $(objtree)/tools 1577 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1578 1579tools/%: FORCE 1580 $(Q)mkdir -p $(objtree)/tools 1581 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1582 1583# --------------------------------------------------------------------------- 1584# Kernel selftest 1585 1586PHONY += kselftest 1587kselftest: headers 1588 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1589 1590kselftest-%: headers FORCE 1591 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1592 1593PHONY += kselftest-merge 1594kselftest-merge: 1595 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1596 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1597 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1598 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1599 1600# --------------------------------------------------------------------------- 1601# Devicetree files 1602 1603ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1604dtstree := arch/$(SRCARCH)/boot/dts 1605endif 1606 1607dtbindingtree := Documentation/devicetree/bindings 1608 1609%.yaml: dtbs_prepare 1610 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1611 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1612 1613ifneq ($(dtstree),) 1614 1615%.dtb: dtbs_prepare 1616 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1617 1618%.dtbo: dtbs_prepare 1619 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1620 1621PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1622dtbs: dtbs_prepare 1623 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1624 1625# include/config/kernel.release is actually needed when installing DTBs because 1626# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1627# dtbs_install depend on it as dtbs_install may run as root. 1628dtbs_prepare: include/config/kernel.release scripts_dtc 1629 1630ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1631export CHECK_DTBS=y 1632endif 1633 1634ifneq ($(CHECK_DTBS),) 1635dtbs_prepare: dt_binding_schemas 1636endif 1637 1638dtbs_check: dtbs 1639 1640dtbs_install: 1641 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1642 1643ifdef CONFIG_OF_EARLY_FLATTREE 1644all: dtbs 1645endif 1646 1647ifdef CONFIG_GENERIC_BUILTIN_DTB 1648vmlinux: dtbs 1649endif 1650 1651endif 1652 1653PHONY += scripts_dtc 1654scripts_dtc: scripts_basic 1655 $(Q)$(MAKE) $(build)=scripts/dtc 1656 1657ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1658export CHECK_DTBS=y 1659endif 1660 1661PHONY += dt_binding_check dt_binding_schemas 1662dt_binding_check: dt_binding_schemas scripts_dtc 1663 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1664 1665dt_binding_schemas: 1666 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1667 1668PHONY += dt_compatible_check 1669dt_compatible_check: dt_binding_schemas 1670 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1671 1672PHONY += dt_style_selftest 1673dt_style_selftest: 1674 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1675 1676# --------------------------------------------------------------------------- 1677# Modules 1678 1679ifdef CONFIG_MODULES 1680 1681# By default, build modules as well 1682 1683all: modules 1684 1685# When we're building modules with modversions, we need to consider 1686# the built-in objects during the descend as well, in order to 1687# make sure the checksums are up to date before we record them. 1688ifdef CONFIG_MODVERSIONS 1689 KBUILD_BUILTIN := y 1690endif 1691 1692# Build modules 1693# 1694 1695# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1696# is an exception. 1697ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1698KBUILD_BUILTIN := y 1699modules: vmlinux 1700endif 1701 1702modules: modules_prepare 1703 1704# Target to prepare building external modules 1705modules_prepare: prepare 1706 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1707 1708endif # CONFIG_MODULES 1709 1710### 1711# Cleaning is done on three levels. 1712# make clean Delete most generated files 1713# Leave enough to build external modules 1714# make mrproper Delete the current configuration, and all generated files 1715# make distclean Remove editor backup files, patch leftover files and the like 1716 1717# Directories & files removed with 'make clean' 1718CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1719 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1720 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1721 vmlinux.thinlto-index builtin.order \ 1722 compile_commands.json rust/test \ 1723 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1724 .builtin-dtbs-list .builtin-dtbs.S 1725 1726# Directories & files removed with 'make mrproper' 1727MRPROPER_FILES += include/config include/generated \ 1728 arch/$(SRCARCH)/include/generated .objdiff \ 1729 debian snap tar-install PKGBUILD pacman \ 1730 .config .config.old .version \ 1731 Module.symvers \ 1732 certs/signing_key.pem \ 1733 certs/x509.genkey \ 1734 vmlinux-gdb.py \ 1735 rpmbuild \ 1736 rust/libmacros.so rust/libmacros.dylib \ 1737 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1738 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1739 1740# clean - Delete most, but leave enough to build external modules 1741# 1742clean: private rm-files := $(CLEAN_FILES) 1743 1744PHONY += archclean vmlinuxclean 1745 1746vmlinuxclean: 1747 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1748 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1749 1750clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1751 1752# mrproper - Delete all generated files, including .config 1753# 1754mrproper: private rm-files := $(MRPROPER_FILES) 1755mrproper-dirs := $(addprefix _mrproper_,scripts) 1756 1757PHONY += $(mrproper-dirs) mrproper 1758$(mrproper-dirs): 1759 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1760 1761mrproper: clean objtool_mrproper $(mrproper-dirs) 1762 $(call cmd,rmfiles) 1763 @find . $(RCS_FIND_IGNORE) \ 1764 \( -name '*.rmeta' \) \ 1765 -type f -print | xargs rm -f 1766 1767# distclean 1768# 1769PHONY += distclean 1770 1771distclean: mrproper 1772 @find . $(RCS_FIND_IGNORE) \ 1773 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1774 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1775 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1776 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1777 -type f -print | xargs rm -f 1778 1779 1780# Packaging of the kernel to various formats 1781# --------------------------------------------------------------------------- 1782 1783modules-cpio-pkg: usr_gen_init_cpio 1784 1785%src-pkg: FORCE 1786 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1787%pkg: include/config/kernel.release FORCE 1788 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1789 1790# Brief documentation of the typical targets used 1791# --------------------------------------------------------------------------- 1792 1793boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1794boards := $(sort $(notdir $(boards))) 1795board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1796board-dirs := $(sort $(notdir $(board-dirs:/=))) 1797 1798PHONY += help 1799help: 1800 @echo 'Cleaning targets:' 1801 @echo ' clean - Remove most generated files but keep the config and' 1802 @echo ' enough build support to build external modules' 1803 @echo ' mrproper - Remove all generated files + config + various backup files' 1804 @echo ' distclean - mrproper + remove editor backup and patch files' 1805 @echo '' 1806 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1807 @echo '' 1808 @echo 'Other generic targets:' 1809 @echo ' all - Build all targets marked with [*]' 1810 @echo '* vmlinux - Build the bare kernel' 1811 @echo '* modules - Build all modules' 1812 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1813 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1814 @echo ' dir/ - Build all files in dir and below' 1815 @echo ' dir/file.[ois] - Build specified target only' 1816 @echo ' dir/file.ll - Build the LLVM assembly file' 1817 @echo ' (requires compiler support for LLVM assembly generation)' 1818 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1819 @echo ' (requires a recent binutils and recent build (System.map))' 1820 @echo ' dir/file.ko - Build module including final link' 1821 @echo ' modules_prepare - Set up for building external modules' 1822 @echo ' tags/TAGS - Generate tags file for editors' 1823 @echo ' cscope - Generate cscope index' 1824 @echo ' gtags - Generate GNU GLOBAL index' 1825 @echo ' kernelrelease - Output the release version string (use with make -s)' 1826 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1827 @echo ' image_name - Output the image name (use with make -s)' 1828 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1829 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1830 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1831 echo '' 1832 @echo 'Static analysers:' 1833 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1834 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1835 @echo ' versioncheck - Sanity check on version.h usage' 1836 @echo ' includecheck - Check for duplicate included header files' 1837 @echo ' headerdep - Detect inclusion cycles in headers' 1838 @echo ' coccicheck - Check with Coccinelle' 1839 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1840 @echo ' clang-analyzer - Check with clang static analyzer' 1841 @echo ' clang-tidy - Check with clang-tidy' 1842 @echo '' 1843 @echo 'Tools:' 1844 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1845 @echo '' 1846 @echo 'Kernel selftest:' 1847 @echo ' kselftest - Build and run kernel selftest' 1848 @echo ' Build, install, and boot kernel before' 1849 @echo ' running kselftest on it' 1850 @echo ' Run as root for full coverage' 1851 @echo ' kselftest-all - Build kernel selftest' 1852 @echo ' kselftest-install - Build and install kernel selftest' 1853 @echo ' kselftest-clean - Remove all generated kselftest files' 1854 @echo ' kselftest-merge - Merge all the config dependencies of' 1855 @echo ' kselftest to existing .config.' 1856 @echo '' 1857 @echo 'Rust targets:' 1858 @echo ' rustavailable - Checks whether the Rust toolchain is' 1859 @echo ' available and, if not, explains why.' 1860 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1861 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1862 @echo ' is formatted, printing a diff otherwise.' 1863 @echo ' rustdoc - Generate Rust documentation' 1864 @echo ' (requires kernel .config)' 1865 @echo ' rusttest - Runs the Rust tests' 1866 @echo ' (requires kernel .config; downloads external repos)' 1867 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1868 @echo ' (requires kernel .config)' 1869 @echo ' dir/file.[os] - Build specified target only' 1870 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1871 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1872 @echo ' The output is not intended to be compilable.' 1873 @echo ' dir/file.ll - Build the LLVM assembly file' 1874 @echo '' 1875 @$(if $(dtstree), \ 1876 echo 'Devicetree:'; \ 1877 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1878 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1879 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1880 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1881 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1882 echo ' dtbs_check - Validate device tree source files';\ 1883 echo '') 1884 1885 @echo 'Userspace tools targets:' 1886 @echo ' use "make tools/help"' 1887 @echo ' or "cd tools; make help"' 1888 @echo '' 1889 @echo 'Kernel packaging:' 1890 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1891 @echo '' 1892 @echo 'Documentation targets:' 1893 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1894 @echo '' 1895 @echo 'Architecture-specific targets ($(SRCARCH)):' 1896 @$(or $(archhelp),\ 1897 echo ' No architecture-specific help defined for $(SRCARCH)') 1898 @echo '' 1899 @$(if $(boards), \ 1900 $(foreach b, $(boards), \ 1901 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1902 echo '') 1903 @$(if $(board-dirs), \ 1904 $(foreach b, $(board-dirs), \ 1905 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1906 printf " %-16s - Show all of the above\\n" help-boards; \ 1907 echo '') 1908 1909 @echo ' make V=n [targets] 1: verbose build' 1910 @echo ' 2: give reason for rebuild of target' 1911 @echo ' V=1 and V=2 can be combined with V=12' 1912 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1913 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1914 @echo ' (sparse by default)' 1915 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1916 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1917 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1918 @echo ' 1: warnings which may be relevant and do not occur too often' 1919 @echo ' 2: warnings which occur quite often but may still be relevant' 1920 @echo ' 3: more obscure warnings, can most likely be ignored' 1921 @echo ' c: extra checks in the configuration stage (Kconfig)' 1922 @echo ' e: warnings are being treated as errors' 1923 @echo ' Multiple levels can be combined with W=12 or W=123' 1924 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1925 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1926 @$(if $(dtstree), \ 1927 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1928 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1929 ) 1930 @echo '' 1931 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1932 @echo 'For further info see the ./README file' 1933 1934 1935help-board-dirs := $(addprefix help-,$(board-dirs)) 1936 1937help-boards: $(help-board-dirs) 1938 1939boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1940 1941$(help-board-dirs): help-%: 1942 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1943 @$(if $(boards-per-dir), \ 1944 $(foreach b, $(boards-per-dir), \ 1945 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1946 echo '') 1947 1948 1949# Documentation targets 1950# --------------------------------------------------------------------------- 1951DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1952 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1953 htmldocs-redirects 1954 1955PHONY += $(DOC_TARGETS) 1956$(DOC_TARGETS): 1957 $(Q)$(MAKE) $(build)=Documentation $@ 1958 1959 1960# Rust targets 1961# --------------------------------------------------------------------------- 1962 1963# "Is Rust available?" target 1964PHONY += rustavailable 1965rustavailable: 1966 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1967 1968# Documentation target 1969# 1970# Using the singular to avoid running afoul of `no-dot-config-targets`. 1971PHONY += rustdoc 1972rustdoc: prepare 1973 $(Q)$(MAKE) $(build)=rust $@ 1974 1975# Testing target 1976PHONY += rusttest 1977rusttest: prepare 1978 $(Q)$(MAKE) $(build)=rust $@ 1979 1980# Formatting targets 1981# 1982# Generated files as well as vendored crates are skipped. 1983PHONY += rustfmt rustfmtcheck 1984 1985rustfmt: 1986 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1987 \( \ 1988 -path $(srctree)/rust/proc-macro2 \ 1989 -o -path $(srctree)/rust/quote \ 1990 -o -path $(srctree)/rust/syn \ 1991 -o -path $(srctree)/rust/zerocopy \ 1992 -o -path $(srctree)/rust/zerocopy-derive \ 1993 \) -prune -o \ 1994 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1995 | xargs $(RUSTFMT) $(rustfmt_flags) 1996 1997rustfmtcheck: rustfmt_flags = --check 1998rustfmtcheck: rustfmt 1999 2000# Misc 2001# --------------------------------------------------------------------------- 2002 2003PHONY += misc-check 2004misc-check: 2005 $(Q)$(srctree)/scripts/misc-check 2006 2007all: misc-check 2008 2009PHONY += scripts_gdb 2010scripts_gdb: prepare0 2011 $(Q)$(MAKE) $(build)=scripts/gdb 2012 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 2013 2014ifdef CONFIG_GDB_SCRIPTS 2015all: scripts_gdb 2016endif 2017 2018else # KBUILD_EXTMOD 2019 2020filechk_kernel.release = echo $(KERNELRELEASE) 2021 2022### 2023# External module support. 2024# When building external modules the kernel used as basis is considered 2025# read-only, and no consistency checks are made and the make 2026# system is not used on the basis kernel. If updates are required 2027# in the basis kernel ordinary make commands (without M=...) must be used. 2028 2029# We are always building only modules. 2030KBUILD_BUILTIN := 2031KBUILD_MODULES := y 2032 2033build-dir := . 2034 2035clean-dirs := . 2036clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2037 2038PHONY += prepare 2039# now expand this into a simple variable to reduce the cost of shell evaluations 2040prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2041prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2042prepare: 2043 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2044 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2045 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2046 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2047 fi 2048 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2049 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2050 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2051 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2052 fi 2053 2054PHONY += help 2055help: 2056 @echo ' Building external modules.' 2057 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2058 @echo '' 2059 @echo ' modules - default target, build the module(s)' 2060 @echo ' modules_install - install the module' 2061 @echo ' clean - remove generated files in module directory only' 2062 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2063 @echo '' 2064 2065ifndef CONFIG_MODULES 2066modules modules_install: __external_modules_error 2067__external_modules_error: 2068 @echo >&2 '***' 2069 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2070 @echo >&2 '*** You cannot build or install external modules.' 2071 @echo >&2 '***' 2072 @false 2073endif 2074 2075endif # KBUILD_EXTMOD 2076 2077# --------------------------------------------------------------------------- 2078# Modules 2079 2080PHONY += modules modules_install modules_sign modules_prepare 2081 2082modules_install: 2083 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2084 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2085 2086ifeq ($(CONFIG_MODULE_SIG),y) 2087# modules_sign is a subset of modules_install. 2088# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2089modules_sign: modules_install 2090 @: 2091else 2092modules_sign: 2093 @echo >&2 '***' 2094 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2095 @echo >&2 '***' 2096 @false 2097endif 2098 2099ifdef CONFIG_MODULES 2100 2101modules.order: $(build-dir) 2102 @: 2103 2104# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2105# This is solely useful to speed up test compiles. 2106modules: modpost 2107ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2108 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2109endif 2110 2111PHONY += modules_check 2112modules_check: modules.order 2113 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2114 2115else # CONFIG_MODULES 2116 2117modules: 2118 @: 2119 2120KBUILD_MODULES := 2121 2122endif # CONFIG_MODULES 2123 2124PHONY += modpost 2125modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2126 $(if $(KBUILD_MODULES), modules_check) 2127 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2128 2129# Single targets 2130# --------------------------------------------------------------------------- 2131# To build individual files in subdirectories, you can do like this: 2132# 2133# make foo/bar/baz.s 2134# 2135# The supported suffixes for single-target are listed in 'single-targets' 2136# 2137# To build only under specific subdirectories, you can do like this: 2138# 2139# make foo/bar/baz/ 2140 2141ifdef single-build 2142 2143# .ko is special because modpost is needed 2144single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2145single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2146 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2147 2148$(single-ko): single_modules 2149 @: 2150$(single-no-ko): $(build-dir) 2151 @: 2152 2153# Remove modules.order when done because it is not the real one. 2154PHONY += single_modules 2155single_modules: $(single-no-ko) modules_prepare 2156 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2157 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2158ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2159 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2160endif 2161 $(Q)rm -f modules.order 2162 2163single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2164 2165KBUILD_MODULES := y 2166 2167endif 2168 2169prepare: outputmakefile 2170 2171# Preset locale variables to speed up the build process. Limit locale 2172# tweaks to this spot to avoid wrong language settings when running 2173# make menuconfig etc. 2174# Error messages still appears in the original language 2175PHONY += $(build-dir) 2176$(build-dir): prepare 2177 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2178 2179clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2180PHONY += $(clean-dirs) clean 2181$(clean-dirs): 2182 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2183 2184clean: $(clean-dirs) 2185 $(call cmd,rmfiles) 2186 @find . $(RCS_FIND_IGNORE) \ 2187 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2188 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2189 -o -name '*.dtb' -o -name '*.dtbo' \ 2190 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2191 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2192 -o -name '*.dwo' -o -name '*.lst' \ 2193 -o -name '*.su' -o -name '*.mod' \ 2194 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2195 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2196 -o -name '*.asn1.[ch]' \ 2197 -o -name '*.symtypes' -o -name 'modules.order' \ 2198 -o -name '*.c.[012]*.*' \ 2199 -o -name '*.ll' \ 2200 -o -name '*.gcno' \ 2201 -o -name '*.long-type-*.txt' \ 2202 \) -type f -print \ 2203 -o -name '.tmp_*' -print \ 2204 | xargs rm -rf 2205 2206# Generate tags for editors 2207# --------------------------------------------------------------------------- 2208quiet_cmd_tags = GEN $@ 2209 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2210 2211tags TAGS cscope gtags: FORCE 2212 $(call cmd,tags) 2213 2214# Generate rust-project.json (a file that describes the structure of non-Cargo 2215# Rust projects) for rust-analyzer (an implementation of the Language Server 2216# Protocol). 2217PHONY += rust-analyzer 2218rust-analyzer: 2219 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2220ifdef KBUILD_EXTMOD 2221# FIXME: external modules must not descend into a sub-directory of the kernel 2222 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2223else 2224 $(Q)$(MAKE) $(build)=rust $@ 2225endif 2226 2227# Script to generate missing namespace dependencies 2228# --------------------------------------------------------------------------- 2229 2230PHONY += nsdeps 2231nsdeps: export KBUILD_NSDEPS=1 2232nsdeps: modules 2233 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2234 2235# Clang Tooling 2236# --------------------------------------------------------------------------- 2237 2238quiet_cmd_gen_compile_commands = GEN $@ 2239 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2240 2241compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2242 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2243 $(if $(CONFIG_MODULES), modules.order) FORCE 2244 $(call if_changed,gen_compile_commands) 2245 2246targets += compile_commands.json 2247 2248PHONY += clang-tidy clang-analyzer 2249 2250ifdef CONFIG_CC_IS_CLANG 2251quiet_cmd_clang_tools = CHECK $< 2252 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2253 2254clang-tidy clang-analyzer: compile_commands.json 2255 $(call cmd,clang_tools) 2256else 2257clang-tidy clang-analyzer: 2258 @echo "$@ requires CC=clang" >&2 2259 @false 2260endif 2261 2262# Scripts to check various things for consistency 2263# --------------------------------------------------------------------------- 2264 2265PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2266 2267includecheck: 2268 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2269 -name '*.[hcS]' -type f -print | sort \ 2270 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2271 2272versioncheck: 2273 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2274 -name '*.[hcS]' -type f -print | sort \ 2275 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2276 2277coccicheck: 2278 $(Q)$(BASH) $(srctree)/scripts/$@ 2279 2280kconfig-sym-check: 2281 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2282 2283PHONY += checkstack kernelrelease kernelversion image_name 2284 2285# UML needs a little special treatment here. It wants to use the host 2286# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2287# else wants $(ARCH), including people doing cross-builds, which means 2288# that $(SUBARCH) doesn't work here. 2289ifeq ($(ARCH), um) 2290CHECKSTACK_ARCH := $(SUBARCH) 2291else 2292CHECKSTACK_ARCH := $(ARCH) 2293endif 2294MINSTACKSIZE ?= 100 2295checkstack: 2296 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2297 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2298 2299kernelrelease: 2300 @$(filechk_kernel.release) 2301 2302kernelversion: 2303 @echo $(KERNELVERSION) 2304 2305image_name: 2306 @echo $(KBUILD_IMAGE) 2307 2308PHONY += run-command 2309run-command: 2310 $(Q)$(KBUILD_RUN_COMMAND) 2311 2312quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2313 cmd_rmfiles = rm -rf $(rm-files) 2314 2315# read saved command lines for existing targets 2316existing-targets := $(wildcard $(sort $(targets))) 2317 2318-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2319 2320endif # config-build 2321endif # mixed-build 2322endif # need-sub-make 2323 2324PHONY += FORCE 2325FORCE: 2326 2327# Declare the contents of the PHONY variable as phony. We keep that 2328# information in a variable so we can use it in if_changed and friends. 2329.PHONY: $(PHONY) 2330