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 832CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 833ifdef CONFIG_CC_IS_GCC 834CFLAGS_GCOV += -fno-tree-loop-im 835endif 836export CFLAGS_GCOV 837 838# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 839ifdef CONFIG_FUNCTION_TRACER 840 CC_FLAGS_FTRACE := -pg 841endif 842 843ifdef CONFIG_TRACEPOINTS 844# To check for unused tracepoints (tracepoints that are defined but never 845# called), run with: 846# 847# make UT=1 848# 849# Each unused tracepoints can take up to 5KB of memory in the running kernel. 850# It is best to remove any that are not used. 851# 852# This command line option will be removed when all current unused 853# tracepoints are removed. 854 855ifeq ("$(origin UT)", "command line") 856 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 857endif 858endif # CONFIG_TRACEPOINTS 859 860export WARN_ON_UNUSED_TRACEPOINTS 861 862# Per-version Rust flags. These are like `rust_common_flags`, but may 863# depend on the Rust compiler version (e.g. using `rustc-min-version`). 864# 865# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 866# include bitmasking and shift operations. However, because it generated 867# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 868# lint which is not enabled by default. 869rust_common_flags_per_version := \ 870 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 871 872rust_common_flags += $(rust_common_flags_per_version) 873KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 874KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 875 876include $(srctree)/arch/$(SRCARCH)/Makefile 877 878ifdef need-config 879ifdef may-sync-config 880# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 881# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 882# because some architectures define CROSS_COMPILE there. 883include include/config/auto.conf.cmd 884 885$(KCONFIG_CONFIG): 886 @echo >&2 '***' 887 @echo >&2 '*** Configuration file "$@" not found!' 888 @echo >&2 '***' 889 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 890 @echo >&2 '*** "make menuconfig" or "make xconfig").' 891 @echo >&2 '***' 892 @/bin/false 893 894# The actual configuration files used during the build are stored in 895# include/generated/ and include/config/. Update them if .config is newer than 896# include/config/auto.conf (which mirrors .config). 897# 898# This exploits the 'multi-target pattern rule' trick. 899# The syncconfig should be executed only once to make all the targets. 900# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 901# 902# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 903# so you cannot notice that Kconfig is waiting for the user input. 904%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 905 $(Q)$(kecho) " SYNC $@" 906 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 907else # !may-sync-config 908# External modules and some install targets need include/generated/autoconf.h 909# and include/config/auto.conf but do not care if they are up-to-date. 910# Use auto.conf to show the error message 911 912checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 913missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 914 915ifdef missing-configs 916PHONY += $(objtree)/include/config/auto.conf 917 918$(objtree)/include/config/auto.conf: 919 @echo >&2 '***' 920 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 921 @printf >&2 '*** - %s\n' $(missing-configs) 922 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 923 @echo >&2 '***' 924 @/bin/false 925endif 926 927endif # may-sync-config 928endif # need-config 929 930KBUILD_CFLAGS += -fno-delete-null-pointer-checks 931 932ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 933KBUILD_CFLAGS += -O2 934KBUILD_RUSTFLAGS += -Copt-level=2 935else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 936KBUILD_CFLAGS += -Os 937KBUILD_RUSTFLAGS += -Copt-level=s 938endif 939 940# Always set `debug-assertions` and `overflow-checks` because their default 941# depends on `opt-level` and `debug-assertions`, respectively. 942KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 943KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 944 945# Tell gcc to never replace conditional load with a non-conditional one 946ifdef CONFIG_CC_IS_GCC 947# gcc-10 renamed --param=allow-store-data-races=0 to 948# -fno-allow-store-data-races. 949KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 950KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 951endif 952 953ifdef CONFIG_READABLE_ASM 954# Disable optimizations that make assembler listings hard to read. 955# reorder blocks reorders the control in the function 956# ipa clone creates specialized cloned functions 957# partial inlining inlines only parts of functions 958KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 959endif 960 961stackp-flags-y := -fno-stack-protector 962stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 963stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 964 965KBUILD_CFLAGS += $(stackp-flags-y) 966 967ifdef CONFIG_FRAME_POINTER 968KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 969KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 970else 971# Some targets (ARM with Thumb2, for example), can't be built with frame 972# pointers. For those, we don't have FUNCTION_TRACER automatically 973# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 974# incompatible with -fomit-frame-pointer with current GCC, so we don't use 975# -fomit-frame-pointer with FUNCTION_TRACER. 976# In the Rust target specification, "frame-pointer" is set explicitly 977# to "may-omit". 978ifndef CONFIG_FUNCTION_TRACER 979KBUILD_CFLAGS += -fomit-frame-pointer 980endif 981endif 982 983# Initialize all stack variables with a 0xAA pattern. 984ifdef CONFIG_INIT_STACK_ALL_PATTERN 985KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 986endif 987 988# Initialize all stack variables with a zero value. 989ifdef CONFIG_INIT_STACK_ALL_ZERO 990KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 991ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 992# https://github.com/llvm/llvm-project/issues/44842 993CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 994export CC_AUTO_VAR_INIT_ZERO_ENABLER 995KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 996endif 997endif 998 999ifdef CONFIG_KMALLOC_PARTITION_TYPED 1000# KMALLOC_PARTITION_CACHES_NR + 1 1001KBUILD_CFLAGS += -falloc-token-max=16 1002endif 1003 1004ifdef CONFIG_CC_IS_CLANG 1005ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1006KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1007endif 1008endif 1009 1010# Explicitly clear padding bits during variable initialization 1011KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1012 1013# While VLAs have been removed, GCC produces unreachable stack probes 1014# for the randomize_kstack_offset feature. Disable it for all compilers. 1015KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1016 1017# Get details on warnings generated due to GCC value tracking. 1018KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1019 1020# Show inlining notes for __attribute__((warning/error)) call chains. 1021# GCC supports this unconditionally while Clang 23+ provides a flag. 1022KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1023 1024# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1025ifdef CONFIG_ZERO_CALL_USED_REGS 1026KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1027endif 1028 1029ifdef CONFIG_FUNCTION_TRACER 1030ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1031 CC_FLAGS_FTRACE += -mrecord-mcount 1032 ifdef CONFIG_HAVE_NOP_MCOUNT 1033 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1034 CC_FLAGS_FTRACE += -mnop-mcount 1035 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1036 endif 1037 endif 1038endif 1039ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1040 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1041 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1042 endif 1043endif 1044ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1045 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1046 BUILD_C_RECORDMCOUNT := y 1047 export BUILD_C_RECORDMCOUNT 1048 endif 1049endif 1050ifdef CONFIG_HAVE_FENTRY 1051 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1052 ifeq ($(call cc-option-yn, -mfentry),y) 1053 CC_FLAGS_FTRACE += -mfentry 1054 CC_FLAGS_USING += -DCC_USING_FENTRY 1055 endif 1056endif 1057export CC_FLAGS_FTRACE 1058KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1059KBUILD_AFLAGS += $(CC_FLAGS_USING) 1060endif 1061 1062# We trigger additional mismatches with less inlining 1063ifdef CONFIG_DEBUG_SECTION_MISMATCH 1064KBUILD_CFLAGS += -fno-inline-functions-called-once 1065endif 1066 1067# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1068ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1069KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1070KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1071LDFLAGS_vmlinux += --gc-sections 1072endif 1073 1074ifdef CONFIG_SHADOW_CALL_STACK 1075ifndef CONFIG_DYNAMIC_SCS 1076CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1077KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1078KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1079endif 1080export CC_FLAGS_SCS 1081endif 1082 1083ifdef CONFIG_LTO_CLANG 1084ifdef CONFIG_LTO_CLANG_FULL 1085CC_FLAGS_LTO := -flto 1086else 1087CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1088 1089# These LLVM options were initially added with only in-process ThinLTO 1090# support, so avoid distributed ThinLTO support for now. 1091ifdef CONFIG_LTO_CLANG_THIN 1092KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1093endif 1094endif 1095CC_FLAGS_LTO += -fvisibility=hidden 1096 1097# Limit inlining across translation units to reduce binary size 1098KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1099endif 1100 1101ifdef CONFIG_LTO 1102KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1103KBUILD_AFLAGS += -fno-lto 1104export CC_FLAGS_LTO 1105endif 1106 1107ifdef CONFIG_CFI 1108CC_FLAGS_CFI := -fsanitize=kcfi 1109ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1110 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1111endif 1112ifdef CONFIG_FINEIBT_BHI 1113 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1114endif 1115ifdef CONFIG_RUST 1116 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1117 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1118 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1119 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1120 export RUSTC_FLAGS_CFI 1121endif 1122KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1123export CC_FLAGS_CFI 1124endif 1125 1126# Architectures can define flags to add/remove for floating-point support 1127CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1128export CC_FLAGS_FPU 1129export CC_FLAGS_NO_FPU 1130 1131ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1132# Set the minimal function alignment. Use the newer GCC option 1133# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1134# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1135ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1136KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1137else 1138KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1139endif 1140endif 1141 1142# arch Makefile may override CC so keep this after arch Makefile is included 1143NOSTDINC_FLAGS += -nostdinc 1144 1145# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1146# the kernel uses only C99 flexible arrays for dynamically sized trailing 1147# arrays. Enforce this for everything that may examine structure sizes and 1148# perform bounds checking. 1149KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1150 1151# disable invalid "can't wrap" optimizations for signed / pointers 1152KBUILD_CFLAGS += -fno-strict-overflow 1153 1154# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1155KBUILD_CFLAGS += -fno-stack-check 1156 1157# conserve stack if available 1158ifdef CONFIG_CC_IS_GCC 1159KBUILD_CFLAGS += -fconserve-stack 1160endif 1161 1162# Ensure compilers do not transform certain loops into calls to wcslen() 1163KBUILD_CFLAGS += -fno-builtin-wcslen 1164 1165# change __FILE__ to the relative path to the source directory 1166ifdef building_out_of_srctree 1167KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1168ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1169KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1170endif 1171endif 1172 1173# include additional Makefiles when needed 1174include-y := scripts/Makefile.warn 1175include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1176include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1177include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1178include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1179include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1180include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1181include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1182include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1183include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1184include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1185include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1186include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1187include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1188 1189include $(addprefix $(srctree)/, $(include-y)) 1190 1191# scripts/Makefile.gcc-plugins is intentionally included last. 1192# Do not add $(call cc-option,...) below this line. When you build the kernel 1193# from the clean source tree, the GCC plugins do not exist at this point. 1194 1195# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1196KBUILD_CPPFLAGS += $(KCPPFLAGS) 1197KBUILD_AFLAGS += $(KAFLAGS) 1198KBUILD_CFLAGS += $(KCFLAGS) 1199KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1200 1201KBUILD_LDFLAGS_MODULE += --build-id=sha1 1202LDFLAGS_vmlinux += --build-id=sha1 1203 1204KBUILD_LDFLAGS += -z noexecstack 1205ifeq ($(CONFIG_LD_IS_BFD),y) 1206KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1207endif 1208 1209ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1210LDFLAGS_vmlinux += -X 1211endif 1212 1213ifeq ($(CONFIG_RELR),y) 1214# ld.lld before 15 did not support -z pack-relative-relocs. 1215LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1216endif 1217 1218# We never want expected sections to be placed heuristically by the 1219# linker. All sections should be explicitly named in the linker script. 1220ifdef CONFIG_LD_ORPHAN_WARN 1221LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1222endif 1223 1224ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1225LDFLAGS_vmlinux += --emit-relocs --discard-none 1226endif 1227 1228# Align the architecture of userspace programs with the kernel 1229USERFLAGS_FROM_KERNEL := --target=% 1230 1231ifdef CONFIG_ARCH_USERFLAGS 1232KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1233KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1234else 1235# If not overridden also inherit the bit size 1236USERFLAGS_FROM_KERNEL += -m32 -m64 1237endif 1238 1239KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1240KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1241 1242# userspace programs are linked via the compiler, use the correct linker 1243ifdef CONFIG_CC_IS_CLANG 1244KBUILD_USERLDFLAGS += --ld-path=$(LD) 1245endif 1246 1247# make the checker run with the right architecture 1248CHECKFLAGS += --arch=$(ARCH) 1249 1250# insure the checker run with the right endianness 1251CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1252 1253# the checker needs the correct machine size 1254CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1255 1256# Validate the checker is available and functional 1257ifneq ($(KBUILD_CHECKSRC), 0) 1258 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1259 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1260 KBUILD_CHECKSRC = 0 1261 endif 1262endif 1263 1264# Default kernel image to build when no specific target is given. 1265# KBUILD_IMAGE may be overruled on the command line or 1266# set in the environment 1267# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1268# this default value 1269export KBUILD_IMAGE ?= vmlinux 1270 1271# 1272# INSTALL_PATH specifies where to place the updated kernel and system map 1273# images. Default is /boot, but you can set it to other values 1274export INSTALL_PATH ?= /boot 1275 1276# 1277# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1278# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1279# an argument if needed. Otherwise it defaults to the kernel install path 1280# 1281export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1282 1283# 1284# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1285# relocations required by build roots. This is not defined in the 1286# makefile but the argument can be passed to make if needed. 1287# 1288 1289MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1290export MODLIB 1291 1292PHONY += prepare0 1293 1294ifeq ($(KBUILD_EXTMOD),) 1295 1296build-dir := . 1297clean-dirs := $(sort . Documentation \ 1298 $(patsubst %/,%,$(filter %/, $(core-) \ 1299 $(drivers-) $(libs-)))) 1300 1301export ARCH_CORE := $(core-y) 1302export ARCH_LIB := $(filter %/, $(libs-y)) 1303export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1304# Externally visible symbols (used by link-vmlinux.sh) 1305 1306KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1307KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1308 1309export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1310export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1311 1312ifdef CONFIG_TRIM_UNUSED_KSYMS 1313# For the kernel to actually contain only the needed exported symbols, 1314# we have to build modules as well to determine what those symbols are. 1315KBUILD_MODULES := y 1316endif 1317 1318PHONY += vmlinux_a 1319vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1320 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1321 1322vmlinux.a: vmlinux_a 1323 @: 1324 1325PHONY += vmlinux_o 1326vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1327 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1328 1329vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1330 @: 1331 1332PHONY += vmlinux 1333# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1334# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1335# unrelated; the decompressors just happen to have the same base name, 1336# arch/*/boot/compressed/vmlinux. 1337# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1338# 1339# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1340# https://savannah.gnu.org/bugs/?61463 1341# For Make > 4.4, the following simple code will work: 1342# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1343vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1344vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1345vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1346 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1347 1348# The actual objects are generated when descending, 1349# make sure no implicit rule kicks in 1350$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1351 1352ifeq ($(origin KERNELRELEASE),file) 1353filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1354else 1355filechk_kernel.release = echo $(KERNELRELEASE) 1356endif 1357 1358# Store (new) KERNELRELEASE string in include/config/kernel.release 1359include/config/kernel.release: FORCE 1360 $(call filechk,kernel.release) 1361 1362# Additional helpers built in scripts/ 1363# Carefully list dependencies so we do not try to build scripts twice 1364# in parallel 1365PHONY += scripts 1366scripts: scripts_basic scripts_dtc 1367 $(Q)$(MAKE) $(build)=$(@) 1368 1369# Things we need to do before we recursively start building the kernel 1370# or the modules are listed in "prepare". 1371# A multi level approach is used. prepareN is processed before prepareN-1. 1372# archprepare is used in arch Makefiles and when processed asm symlink, 1373# version.h and scripts_basic is processed / created. 1374 1375PHONY += prepare archprepare 1376 1377archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1378 asm-generic $(version_h) include/generated/utsrelease.h \ 1379 include/generated/compile.h include/generated/autoconf.h \ 1380 include/generated/rustc_cfg remove-stale-files 1381 1382prepare0: archprepare 1383 $(Q)$(MAKE) $(build)=scripts/mod 1384 $(Q)$(MAKE) $(build)=. prepare 1385 1386# All the preparing.. 1387prepare: prepare0 1388ifdef CONFIG_RUST 1389 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1390 $(Q)$(MAKE) $(build)=rust 1391endif 1392 1393PHONY += remove-stale-files 1394remove-stale-files: 1395 $(Q)$(srctree)/scripts/remove-stale-files 1396 1397# Support for using generic headers in asm-generic 1398asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1399 1400PHONY += asm-generic uapi-asm-generic 1401asm-generic: uapi-asm-generic 1402 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1403 generic=include/asm-generic 1404uapi-asm-generic: 1405 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1406 generic=include/uapi/asm-generic 1407 1408# Generate some files 1409# --------------------------------------------------------------------------- 1410 1411# KERNELRELEASE can change from a few different places, meaning version.h 1412# needs to be updated, so this check is forced on all builds 1413 1414uts_len := 64 1415define filechk_utsrelease.h 1416 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1417 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1418 exit 1; \ 1419 fi; \ 1420 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1421endef 1422 1423define filechk_version.h 1424 if [ $(SUBLEVEL) -gt 255 ]; then \ 1425 echo \#define LINUX_VERSION_CODE $(shell \ 1426 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1427 else \ 1428 echo \#define LINUX_VERSION_CODE $(shell \ 1429 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1430 fi; \ 1431 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1432 ((c) > 255 ? 255 : (c)))'; \ 1433 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1434 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1435 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1436endef 1437 1438$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1439$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1440$(version_h): FORCE 1441 $(call filechk,version.h) 1442 1443include/generated/utsrelease.h: include/config/kernel.release FORCE 1444 $(call filechk,utsrelease.h) 1445 1446filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1447 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1448 1449include/generated/compile.h: FORCE 1450 $(call filechk,compile.h) 1451 1452PHONY += headerdep 1453headerdep: 1454 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1455 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1456 1457# --------------------------------------------------------------------------- 1458# Kernel headers 1459 1460#Default location for installed headers 1461export INSTALL_HDR_PATH = $(objtree)/usr 1462 1463quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1464 cmd_headers_install = \ 1465 mkdir -p $(INSTALL_HDR_PATH); \ 1466 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1467 usr/include $(INSTALL_HDR_PATH) 1468 1469PHONY += headers_install 1470headers_install: headers 1471 $(call cmd,headers_install) 1472 1473PHONY += archheaders archscripts 1474 1475hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1476 1477PHONY += headers 1478headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1479ifdef HEADER_ARCH 1480 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1481else 1482 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1483 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1484endif 1485 1486ifdef CONFIG_HEADERS_INSTALL 1487prepare: headers 1488endif 1489 1490PHONY += usr_gen_init_cpio 1491usr_gen_init_cpio: scripts_basic 1492 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1493 1494PHONY += scripts_unifdef 1495scripts_unifdef: scripts_basic 1496 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1497 1498PHONY += scripts_gen_packed_field_checks 1499scripts_gen_packed_field_checks: scripts_basic 1500 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1501 1502# --------------------------------------------------------------------------- 1503# Install 1504 1505# Many distributions have the custom install script, /sbin/installkernel. 1506# If DKMS is installed, 'make install' will eventually recurse back 1507# to this Makefile to build and install external modules. 1508# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1509 1510quiet_cmd_install = INSTALL $(INSTALL_PATH) 1511 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1512 1513# --------------------------------------------------------------------------- 1514# vDSO install 1515 1516PHONY += vdso_install 1517vdso_install: export INSTALL_FILES = $(vdso-install-y) 1518vdso_install: 1519 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1520 1521# --------------------------------------------------------------------------- 1522# Tools 1523 1524ifdef CONFIG_OBJTOOL 1525prepare: tools/objtool 1526endif 1527 1528ifdef CONFIG_BPF 1529ifdef CONFIG_DEBUG_INFO_BTF 1530prepare: tools/bpf/resolve_btfids 1531endif 1532endif 1533 1534# The tools build system is not a part of Kbuild and tends to introduce 1535# its own unique issues. If you need to integrate a new tool into Kbuild, 1536# please consider locating that tool outside the tools/ tree and using the 1537# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1538# here. See Documentation/kbuild/makefiles.rst for details. 1539 1540PHONY += resolve_btfids_clean 1541 1542resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1543 1544# tools/bpf/resolve_btfids directory might not exist 1545# in output directory, skip its clean in that case 1546resolve_btfids_clean: 1547ifneq ($(wildcard $(resolve_btfids_O)),) 1548 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1549endif 1550 1551PHONY += objtool_clean objtool_mrproper 1552 1553objtool_O = $(abspath $(objtree))/tools/objtool 1554 1555objtool_clean objtool_mrproper: 1556ifneq ($(wildcard $(objtool_O)),) 1557 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1558endif 1559 1560tools/: FORCE 1561 $(Q)mkdir -p $(objtree)/tools 1562 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1563 1564tools/%: FORCE 1565 $(Q)mkdir -p $(objtree)/tools 1566 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1567 1568# --------------------------------------------------------------------------- 1569# Kernel selftest 1570 1571PHONY += kselftest 1572kselftest: headers 1573 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1574 1575kselftest-%: headers FORCE 1576 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1577 1578PHONY += kselftest-merge 1579kselftest-merge: 1580 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1581 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1582 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1583 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1584 1585# --------------------------------------------------------------------------- 1586# Devicetree files 1587 1588ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1589dtstree := arch/$(SRCARCH)/boot/dts 1590endif 1591 1592dtbindingtree := Documentation/devicetree/bindings 1593 1594%.yaml: dtbs_prepare 1595 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1596 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1597 1598ifneq ($(dtstree),) 1599 1600%.dtb: dtbs_prepare 1601 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1602 1603%.dtbo: dtbs_prepare 1604 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1605 1606PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1607dtbs: dtbs_prepare 1608 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1609 1610# include/config/kernel.release is actually needed when installing DTBs because 1611# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1612# dtbs_install depend on it as dtbs_install may run as root. 1613dtbs_prepare: include/config/kernel.release scripts_dtc 1614 1615ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1616export CHECK_DTBS=y 1617endif 1618 1619ifneq ($(CHECK_DTBS),) 1620dtbs_prepare: dt_binding_schemas 1621endif 1622 1623dtbs_check: dtbs 1624 1625dtbs_install: 1626 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1627 1628ifdef CONFIG_OF_EARLY_FLATTREE 1629all: dtbs 1630endif 1631 1632ifdef CONFIG_GENERIC_BUILTIN_DTB 1633vmlinux: dtbs 1634endif 1635 1636endif 1637 1638PHONY += scripts_dtc 1639scripts_dtc: scripts_basic 1640 $(Q)$(MAKE) $(build)=scripts/dtc 1641 1642ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1643export CHECK_DTBS=y 1644endif 1645 1646PHONY += dt_binding_check dt_binding_schemas 1647dt_binding_check: dt_binding_schemas scripts_dtc 1648 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1649 1650dt_binding_schemas: 1651 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1652 1653PHONY += dt_compatible_check 1654dt_compatible_check: dt_binding_schemas 1655 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1656 1657PHONY += dt_style_selftest 1658dt_style_selftest: 1659 $(Q)$(srctree)/scripts/dtc/dt-style-selftest/run.sh 1660 1661# --------------------------------------------------------------------------- 1662# Modules 1663 1664ifdef CONFIG_MODULES 1665 1666# By default, build modules as well 1667 1668all: modules 1669 1670# When we're building modules with modversions, we need to consider 1671# the built-in objects during the descend as well, in order to 1672# make sure the checksums are up to date before we record them. 1673ifdef CONFIG_MODVERSIONS 1674 KBUILD_BUILTIN := y 1675endif 1676 1677# Build modules 1678# 1679 1680# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1681# is an exception. 1682ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1683KBUILD_BUILTIN := y 1684modules: vmlinux 1685endif 1686 1687modules: modules_prepare 1688 1689# Target to prepare building external modules 1690modules_prepare: prepare 1691 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1692 1693endif # CONFIG_MODULES 1694 1695### 1696# Cleaning is done on three levels. 1697# make clean Delete most generated files 1698# Leave enough to build external modules 1699# make mrproper Delete the current configuration, and all generated files 1700# make distclean Remove editor backup files, patch leftover files and the like 1701 1702# Directories & files removed with 'make clean' 1703CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1704 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1705 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1706 vmlinux.thinlto-index builtin.order \ 1707 compile_commands.json rust/test \ 1708 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1709 .builtin-dtbs-list .builtin-dtbs.S 1710 1711# Directories & files removed with 'make mrproper' 1712MRPROPER_FILES += include/config include/generated \ 1713 arch/$(SRCARCH)/include/generated .objdiff \ 1714 debian snap tar-install PKGBUILD pacman \ 1715 .config .config.old .version \ 1716 Module.symvers \ 1717 certs/signing_key.pem \ 1718 certs/x509.genkey \ 1719 vmlinux-gdb.py \ 1720 rpmbuild \ 1721 rust/libmacros.so rust/libmacros.dylib \ 1722 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1723 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1724 1725# clean - Delete most, but leave enough to build external modules 1726# 1727clean: private rm-files := $(CLEAN_FILES) 1728 1729PHONY += archclean vmlinuxclean 1730 1731vmlinuxclean: 1732 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1733 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1734 1735clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1736 1737# mrproper - Delete all generated files, including .config 1738# 1739mrproper: private rm-files := $(MRPROPER_FILES) 1740mrproper-dirs := $(addprefix _mrproper_,scripts) 1741 1742PHONY += $(mrproper-dirs) mrproper 1743$(mrproper-dirs): 1744 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1745 1746mrproper: clean objtool_mrproper $(mrproper-dirs) 1747 $(call cmd,rmfiles) 1748 @find . $(RCS_FIND_IGNORE) \ 1749 \( -name '*.rmeta' \) \ 1750 -type f -print | xargs rm -f 1751 1752# distclean 1753# 1754PHONY += distclean 1755 1756distclean: mrproper 1757 @find . $(RCS_FIND_IGNORE) \ 1758 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1759 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1760 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1761 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1762 -type f -print | xargs rm -f 1763 1764 1765# Packaging of the kernel to various formats 1766# --------------------------------------------------------------------------- 1767 1768modules-cpio-pkg: usr_gen_init_cpio 1769 1770%src-pkg: FORCE 1771 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1772%pkg: include/config/kernel.release FORCE 1773 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1774 1775# Brief documentation of the typical targets used 1776# --------------------------------------------------------------------------- 1777 1778boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1779boards := $(sort $(notdir $(boards))) 1780board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1781board-dirs := $(sort $(notdir $(board-dirs:/=))) 1782 1783PHONY += help 1784help: 1785 @echo 'Cleaning targets:' 1786 @echo ' clean - Remove most generated files but keep the config and' 1787 @echo ' enough build support to build external modules' 1788 @echo ' mrproper - Remove all generated files + config + various backup files' 1789 @echo ' distclean - mrproper + remove editor backup and patch files' 1790 @echo '' 1791 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1792 @echo '' 1793 @echo 'Other generic targets:' 1794 @echo ' all - Build all targets marked with [*]' 1795 @echo '* vmlinux - Build the bare kernel' 1796 @echo '* modules - Build all modules' 1797 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1798 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1799 @echo ' dir/ - Build all files in dir and below' 1800 @echo ' dir/file.[ois] - Build specified target only' 1801 @echo ' dir/file.ll - Build the LLVM assembly file' 1802 @echo ' (requires compiler support for LLVM assembly generation)' 1803 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1804 @echo ' (requires a recent binutils and recent build (System.map))' 1805 @echo ' dir/file.ko - Build module including final link' 1806 @echo ' modules_prepare - Set up for building external modules' 1807 @echo ' tags/TAGS - Generate tags file for editors' 1808 @echo ' cscope - Generate cscope index' 1809 @echo ' gtags - Generate GNU GLOBAL index' 1810 @echo ' kernelrelease - Output the release version string (use with make -s)' 1811 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1812 @echo ' image_name - Output the image name (use with make -s)' 1813 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1814 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1815 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1816 echo '' 1817 @echo 'Static analysers:' 1818 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1819 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1820 @echo ' versioncheck - Sanity check on version.h usage' 1821 @echo ' includecheck - Check for duplicate included header files' 1822 @echo ' headerdep - Detect inclusion cycles in headers' 1823 @echo ' coccicheck - Check with Coccinelle' 1824 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1825 @echo ' clang-analyzer - Check with clang static analyzer' 1826 @echo ' clang-tidy - Check with clang-tidy' 1827 @echo '' 1828 @echo 'Tools:' 1829 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1830 @echo '' 1831 @echo 'Kernel selftest:' 1832 @echo ' kselftest - Build and run kernel selftest' 1833 @echo ' Build, install, and boot kernel before' 1834 @echo ' running kselftest on it' 1835 @echo ' Run as root for full coverage' 1836 @echo ' kselftest-all - Build kernel selftest' 1837 @echo ' kselftest-install - Build and install kernel selftest' 1838 @echo ' kselftest-clean - Remove all generated kselftest files' 1839 @echo ' kselftest-merge - Merge all the config dependencies of' 1840 @echo ' kselftest to existing .config.' 1841 @echo '' 1842 @echo 'Rust targets:' 1843 @echo ' rustavailable - Checks whether the Rust toolchain is' 1844 @echo ' available and, if not, explains why.' 1845 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1846 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1847 @echo ' is formatted, printing a diff otherwise.' 1848 @echo ' rustdoc - Generate Rust documentation' 1849 @echo ' (requires kernel .config)' 1850 @echo ' rusttest - Runs the Rust tests' 1851 @echo ' (requires kernel .config; downloads external repos)' 1852 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1853 @echo ' (requires kernel .config)' 1854 @echo ' dir/file.[os] - Build specified target only' 1855 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1856 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1857 @echo ' The output is not intended to be compilable.' 1858 @echo ' dir/file.ll - Build the LLVM assembly file' 1859 @echo '' 1860 @$(if $(dtstree), \ 1861 echo 'Devicetree:'; \ 1862 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1863 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1864 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1865 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1866 echo ' dt_style_selftest - Run dt-check-style fixture tests'; \ 1867 echo ' dtbs_check - Validate device tree source files';\ 1868 echo '') 1869 1870 @echo 'Userspace tools targets:' 1871 @echo ' use "make tools/help"' 1872 @echo ' or "cd tools; make help"' 1873 @echo '' 1874 @echo 'Kernel packaging:' 1875 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1876 @echo '' 1877 @echo 'Documentation targets:' 1878 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1879 @echo '' 1880 @echo 'Architecture-specific targets ($(SRCARCH)):' 1881 @$(or $(archhelp),\ 1882 echo ' No architecture-specific help defined for $(SRCARCH)') 1883 @echo '' 1884 @$(if $(boards), \ 1885 $(foreach b, $(boards), \ 1886 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1887 echo '') 1888 @$(if $(board-dirs), \ 1889 $(foreach b, $(board-dirs), \ 1890 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1891 printf " %-16s - Show all of the above\\n" help-boards; \ 1892 echo '') 1893 1894 @echo ' make V=n [targets] 1: verbose build' 1895 @echo ' 2: give reason for rebuild of target' 1896 @echo ' V=1 and V=2 can be combined with V=12' 1897 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1898 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1899 @echo ' (sparse by default)' 1900 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1901 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1902 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1903 @echo ' 1: warnings which may be relevant and do not occur too often' 1904 @echo ' 2: warnings which occur quite often but may still be relevant' 1905 @echo ' 3: more obscure warnings, can most likely be ignored' 1906 @echo ' c: extra checks in the configuration stage (Kconfig)' 1907 @echo ' e: warnings are being treated as errors' 1908 @echo ' Multiple levels can be combined with W=12 or W=123' 1909 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1910 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1911 @$(if $(dtstree), \ 1912 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1913 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1914 ) 1915 @echo '' 1916 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1917 @echo 'For further info see the ./README file' 1918 1919 1920help-board-dirs := $(addprefix help-,$(board-dirs)) 1921 1922help-boards: $(help-board-dirs) 1923 1924boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1925 1926$(help-board-dirs): help-%: 1927 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1928 @$(if $(boards-per-dir), \ 1929 $(foreach b, $(boards-per-dir), \ 1930 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1931 echo '') 1932 1933 1934# Documentation targets 1935# --------------------------------------------------------------------------- 1936DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1937 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1938 htmldocs-redirects 1939 1940PHONY += $(DOC_TARGETS) 1941$(DOC_TARGETS): 1942 $(Q)$(MAKE) $(build)=Documentation $@ 1943 1944 1945# Rust targets 1946# --------------------------------------------------------------------------- 1947 1948# "Is Rust available?" target 1949PHONY += rustavailable 1950rustavailable: 1951 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1952 1953# Documentation target 1954# 1955# Using the singular to avoid running afoul of `no-dot-config-targets`. 1956PHONY += rustdoc 1957rustdoc: prepare 1958 $(Q)$(MAKE) $(build)=rust $@ 1959 1960# Testing target 1961PHONY += rusttest 1962rusttest: prepare 1963 $(Q)$(MAKE) $(build)=rust $@ 1964 1965# Formatting targets 1966# 1967# Generated files as well as vendored crates are skipped. 1968PHONY += rustfmt rustfmtcheck 1969 1970rustfmt: 1971 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1972 \( \ 1973 -path $(srctree)/rust/proc-macro2 \ 1974 -o -path $(srctree)/rust/quote \ 1975 -o -path $(srctree)/rust/syn \ 1976 -o -path $(srctree)/rust/zerocopy \ 1977 -o -path $(srctree)/rust/zerocopy-derive \ 1978 \) -prune -o \ 1979 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1980 | xargs $(RUSTFMT) $(rustfmt_flags) 1981 1982rustfmtcheck: rustfmt_flags = --check 1983rustfmtcheck: rustfmt 1984 1985# Misc 1986# --------------------------------------------------------------------------- 1987 1988PHONY += misc-check 1989misc-check: 1990 $(Q)$(srctree)/scripts/misc-check 1991 1992all: misc-check 1993 1994PHONY += scripts_gdb 1995scripts_gdb: prepare0 1996 $(Q)$(MAKE) $(build)=scripts/gdb 1997 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1998 1999ifdef CONFIG_GDB_SCRIPTS 2000all: scripts_gdb 2001endif 2002 2003else # KBUILD_EXTMOD 2004 2005filechk_kernel.release = echo $(KERNELRELEASE) 2006 2007### 2008# External module support. 2009# When building external modules the kernel used as basis is considered 2010# read-only, and no consistency checks are made and the make 2011# system is not used on the basis kernel. If updates are required 2012# in the basis kernel ordinary make commands (without M=...) must be used. 2013 2014# We are always building only modules. 2015KBUILD_BUILTIN := 2016KBUILD_MODULES := y 2017 2018build-dir := . 2019 2020clean-dirs := . 2021clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2022 2023PHONY += prepare 2024# now expand this into a simple variable to reduce the cost of shell evaluations 2025prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2026prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2027prepare: 2028 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2029 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2030 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2031 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2032 fi 2033 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2034 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2035 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2036 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2037 fi 2038 2039PHONY += help 2040help: 2041 @echo ' Building external modules.' 2042 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2043 @echo '' 2044 @echo ' modules - default target, build the module(s)' 2045 @echo ' modules_install - install the module' 2046 @echo ' clean - remove generated files in module directory only' 2047 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2048 @echo '' 2049 2050ifndef CONFIG_MODULES 2051modules modules_install: __external_modules_error 2052__external_modules_error: 2053 @echo >&2 '***' 2054 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2055 @echo >&2 '*** You cannot build or install external modules.' 2056 @echo >&2 '***' 2057 @false 2058endif 2059 2060endif # KBUILD_EXTMOD 2061 2062# --------------------------------------------------------------------------- 2063# Modules 2064 2065PHONY += modules modules_install modules_sign modules_prepare 2066 2067modules_install: 2068 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2069 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2070 2071ifeq ($(CONFIG_MODULE_SIG),y) 2072# modules_sign is a subset of modules_install. 2073# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2074modules_sign: modules_install 2075 @: 2076else 2077modules_sign: 2078 @echo >&2 '***' 2079 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2080 @echo >&2 '***' 2081 @false 2082endif 2083 2084ifdef CONFIG_MODULES 2085 2086modules.order: $(build-dir) 2087 @: 2088 2089# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2090# This is solely useful to speed up test compiles. 2091modules: modpost 2092ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2094endif 2095 2096PHONY += modules_check 2097modules_check: modules.order 2098 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2099 2100else # CONFIG_MODULES 2101 2102modules: 2103 @: 2104 2105KBUILD_MODULES := 2106 2107endif # CONFIG_MODULES 2108 2109PHONY += modpost 2110modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2111 $(if $(KBUILD_MODULES), modules_check) 2112 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2113 2114# Single targets 2115# --------------------------------------------------------------------------- 2116# To build individual files in subdirectories, you can do like this: 2117# 2118# make foo/bar/baz.s 2119# 2120# The supported suffixes for single-target are listed in 'single-targets' 2121# 2122# To build only under specific subdirectories, you can do like this: 2123# 2124# make foo/bar/baz/ 2125 2126ifdef single-build 2127 2128# .ko is special because modpost is needed 2129single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2130single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2131 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2132 2133$(single-ko): single_modules 2134 @: 2135$(single-no-ko): $(build-dir) 2136 @: 2137 2138# Remove modules.order when done because it is not the real one. 2139PHONY += single_modules 2140single_modules: $(single-no-ko) modules_prepare 2141 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2143ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2144 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2145endif 2146 $(Q)rm -f modules.order 2147 2148single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2149 2150KBUILD_MODULES := y 2151 2152endif 2153 2154prepare: outputmakefile 2155 2156# Preset locale variables to speed up the build process. Limit locale 2157# tweaks to this spot to avoid wrong language settings when running 2158# make menuconfig etc. 2159# Error messages still appears in the original language 2160PHONY += $(build-dir) 2161$(build-dir): prepare 2162 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2163 2164clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2165PHONY += $(clean-dirs) clean 2166$(clean-dirs): 2167 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2168 2169clean: $(clean-dirs) 2170 $(call cmd,rmfiles) 2171 @find . $(RCS_FIND_IGNORE) \ 2172 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2173 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2174 -o -name '*.dtb' -o -name '*.dtbo' \ 2175 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2176 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2177 -o -name '*.dwo' -o -name '*.lst' \ 2178 -o -name '*.su' -o -name '*.mod' \ 2179 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2180 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2181 -o -name '*.asn1.[ch]' \ 2182 -o -name '*.symtypes' -o -name 'modules.order' \ 2183 -o -name '*.c.[012]*.*' \ 2184 -o -name '*.ll' \ 2185 -o -name '*.gcno' \ 2186 -o -name '*.long-type-*.txt' \ 2187 \) -type f -print \ 2188 -o -name '.tmp_*' -print \ 2189 | xargs rm -rf 2190 2191# Generate tags for editors 2192# --------------------------------------------------------------------------- 2193quiet_cmd_tags = GEN $@ 2194 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2195 2196tags TAGS cscope gtags: FORCE 2197 $(call cmd,tags) 2198 2199# Generate rust-project.json (a file that describes the structure of non-Cargo 2200# Rust projects) for rust-analyzer (an implementation of the Language Server 2201# Protocol). 2202PHONY += rust-analyzer 2203rust-analyzer: 2204 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2205ifdef KBUILD_EXTMOD 2206# FIXME: external modules must not descend into a sub-directory of the kernel 2207 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2208else 2209 $(Q)$(MAKE) $(build)=rust $@ 2210endif 2211 2212# Script to generate missing namespace dependencies 2213# --------------------------------------------------------------------------- 2214 2215PHONY += nsdeps 2216nsdeps: export KBUILD_NSDEPS=1 2217nsdeps: modules 2218 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2219 2220# Clang Tooling 2221# --------------------------------------------------------------------------- 2222 2223quiet_cmd_gen_compile_commands = GEN $@ 2224 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2225 2226compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2227 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2228 $(if $(CONFIG_MODULES), modules.order) FORCE 2229 $(call if_changed,gen_compile_commands) 2230 2231targets += compile_commands.json 2232 2233PHONY += clang-tidy clang-analyzer 2234 2235ifdef CONFIG_CC_IS_CLANG 2236quiet_cmd_clang_tools = CHECK $< 2237 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2238 2239clang-tidy clang-analyzer: compile_commands.json 2240 $(call cmd,clang_tools) 2241else 2242clang-tidy clang-analyzer: 2243 @echo "$@ requires CC=clang" >&2 2244 @false 2245endif 2246 2247# Scripts to check various things for consistency 2248# --------------------------------------------------------------------------- 2249 2250PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2251 2252includecheck: 2253 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2254 -name '*.[hcS]' -type f -print | sort \ 2255 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2256 2257versioncheck: 2258 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2259 -name '*.[hcS]' -type f -print | sort \ 2260 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2261 2262coccicheck: 2263 $(Q)$(BASH) $(srctree)/scripts/$@ 2264 2265kconfig-sym-check: 2266 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2267 2268PHONY += checkstack kernelrelease kernelversion image_name 2269 2270# UML needs a little special treatment here. It wants to use the host 2271# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2272# else wants $(ARCH), including people doing cross-builds, which means 2273# that $(SUBARCH) doesn't work here. 2274ifeq ($(ARCH), um) 2275CHECKSTACK_ARCH := $(SUBARCH) 2276else 2277CHECKSTACK_ARCH := $(ARCH) 2278endif 2279MINSTACKSIZE ?= 100 2280checkstack: 2281 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2282 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2283 2284kernelrelease: 2285 @$(filechk_kernel.release) 2286 2287kernelversion: 2288 @echo $(KERNELVERSION) 2289 2290image_name: 2291 @echo $(KBUILD_IMAGE) 2292 2293PHONY += run-command 2294run-command: 2295 $(Q)$(KBUILD_RUN_COMMAND) 2296 2297quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2298 cmd_rmfiles = rm -rf $(rm-files) 2299 2300# read saved command lines for existing targets 2301existing-targets := $(wildcard $(sort $(targets))) 2302 2303-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2304 2305endif # config-build 2306endif # mixed-build 2307endif # need-sub-make 2308 2309PHONY += FORCE 2310FORCE: 2311 2312# Declare the contents of the PHONY variable as phony. We keep that 2313# information in a variable so we can use it in if_changed and friends. 2314.PHONY: $(PHONY) 2315