1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Hurr durr I'ma ninja sloth 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 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Enable "clippy" (a linter) as part of the Rust compilation. 124# 125# Use 'make CLIPPY=1' to enable it. 126ifeq ("$(origin CLIPPY)", "command line") 127 KBUILD_CLIPPY := $(CLIPPY) 128endif 129 130export KBUILD_CLIPPY 131 132# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 133# directory of external module to build. Setting M= takes precedence. 134ifeq ("$(origin M)", "command line") 135 KBUILD_EXTMOD := $(M) 136endif 137 138$(if $(word 2, $(KBUILD_EXTMOD)), \ 139 $(error building multiple external modules is not supported)) 140 141$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 142 $(error module directory path cannot contain '$x'))) 143 144# Remove trailing slashes 145ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 146KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 147endif 148 149export KBUILD_EXTMOD 150 151# Kbuild will save output files in the current working directory. 152# This does not need to match to the root of the kernel source tree. 153# 154# For example, you can do this: 155# 156# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 157# 158# If you want to save output files in a different location, there are 159# two syntaxes to specify it. 160# 161# 1) O= 162# Use "make O=dir/to/store/output/files/" 163# 164# 2) Set KBUILD_OUTPUT 165# Set the environment variable KBUILD_OUTPUT to point to the output directory. 166# export KBUILD_OUTPUT=dir/to/store/output/files/; make 167# 168# The O= assignment takes precedence over the KBUILD_OUTPUT environment 169# variable. 170 171# Do we want to change the working directory? 172ifeq ("$(origin O)", "command line") 173 KBUILD_OUTPUT := $(O) 174endif 175 176ifneq ($(KBUILD_OUTPUT),) 177# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 178# expand a shell special character '~'. We use a somewhat tedious way here. 179abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 180$(if $(abs_objtree),, \ 181 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 182 183# $(realpath ...) resolves symlinks 184abs_objtree := $(realpath $(abs_objtree)) 185else 186abs_objtree := $(CURDIR) 187endif # ifneq ($(KBUILD_OUTPUT),) 188 189ifeq ($(abs_objtree),$(CURDIR)) 190# Suppress "Entering directory ..." unless we are changing the work directory. 191MAKEFLAGS += --no-print-directory 192else 193need-sub-make := 1 194endif 195 196this-makefile := $(lastword $(MAKEFILE_LIST)) 197abs_srctree := $(realpath $(dir $(this-makefile))) 198 199ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 200$(error source directory cannot contain spaces or colons) 201endif 202 203ifneq ($(abs_srctree),$(abs_objtree)) 204# Look for make include files relative to root of kernel src 205# 206# --included-dir is added for backward compatibility, but you should not rely on 207# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 208MAKEFLAGS += --include-dir=$(abs_srctree) 209endif 210 211ifneq ($(filter 3.%,$(MAKE_VERSION)),) 212# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 213# We need to invoke sub-make to avoid implicit rules in the top Makefile. 214need-sub-make := 1 215# Cancel implicit rules for this Makefile. 216$(this-makefile): ; 217endif 218 219export abs_srctree abs_objtree 220export sub_make_done := 1 221 222ifeq ($(need-sub-make),1) 223 224PHONY += $(MAKECMDGOALS) __sub-make 225 226$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 227 @: 228 229# Invoke a second make in the output directory, passing relevant variables 230__sub-make: 231 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 232 233endif # need-sub-make 234endif # sub_make_done 235 236# We process the rest of the Makefile if this is the final invocation of make 237ifeq ($(need-sub-make),) 238 239# Do not print "Entering directory ...", 240# but we want to display it when entering to the output directory 241# so that IDEs/editors are able to understand relative filenames. 242MAKEFLAGS += --no-print-directory 243 244ifeq ($(abs_srctree),$(abs_objtree)) 245 # building in the source tree 246 srctree := . 247 building_out_of_srctree := 248else 249 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 250 # building in a subdirectory of the source tree 251 srctree := .. 252 else 253 srctree := $(abs_srctree) 254 endif 255 building_out_of_srctree := 1 256endif 257 258ifneq ($(KBUILD_ABS_SRCTREE),) 259srctree := $(abs_srctree) 260endif 261 262objtree := . 263VPATH := $(srctree) 264 265export building_out_of_srctree srctree objtree VPATH 266 267# To make sure we do not include .config for any of the *config targets 268# catch them early, and hand them over to scripts/kconfig/Makefile 269# It is allowed to specify more targets when calling make, including 270# mixing *config targets and build targets. 271# For example 'make oldconfig all'. 272# Detect when mixed targets is specified, and make a second invocation 273# of make so .config is not included in this case either (for *config). 274 275version_h := include/generated/uapi/linux/version.h 276 277clean-targets := %clean mrproper cleandocs 278no-dot-config-targets := $(clean-targets) \ 279 cscope gtags TAGS tags help% %docs check% coccicheck \ 280 $(version_h) headers headers_% archheaders archscripts \ 281 %asm-generic kernelversion %src-pkg dt_binding_check \ 282 outputmakefile rustavailable rustfmt rustfmtcheck 283# Installation targets should not require compiler. Unfortunately, vdso_install 284# is an exception where build artifacts may be updated. This must be fixed. 285no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 286 headers_install modules_install kernelrelease image_name 287no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 288 image_name 289single-targets := %.a %.i %.rsi %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 290 291config-build := 292mixed-build := 293need-config := 1 294need-compiler := 1 295may-sync-config := 1 296single-build := 297 298ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 299 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 300 need-config := 301 endif 302endif 303 304ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 305 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 306 need-compiler := 307 endif 308endif 309 310ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 311 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 312 may-sync-config := 313 endif 314endif 315 316ifneq ($(KBUILD_EXTMOD),) 317 may-sync-config := 318endif 319 320ifeq ($(KBUILD_EXTMOD),) 321 ifneq ($(filter %config,$(MAKECMDGOALS)),) 322 config-build := 1 323 ifneq ($(words $(MAKECMDGOALS)),1) 324 mixed-build := 1 325 endif 326 endif 327endif 328 329# We cannot build single targets and the others at the same time 330ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 331 single-build := 1 332 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 333 mixed-build := 1 334 endif 335endif 336 337# For "make -j clean all", "make -j mrproper defconfig all", etc. 338ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 339 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 340 mixed-build := 1 341 endif 342endif 343 344# install and modules_install need also be processed one by one 345ifneq ($(filter install,$(MAKECMDGOALS)),) 346 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 347 mixed-build := 1 348 endif 349endif 350 351ifdef mixed-build 352# =========================================================================== 353# We're called with mixed targets (*config and build targets). 354# Handle them one by one. 355 356PHONY += $(MAKECMDGOALS) __build_one_by_one 357 358$(MAKECMDGOALS): __build_one_by_one 359 @: 360 361__build_one_by_one: 362 $(Q)set -e; \ 363 for i in $(MAKECMDGOALS); do \ 364 $(MAKE) -f $(srctree)/Makefile $$i; \ 365 done 366 367else # !mixed-build 368 369include $(srctree)/scripts/Kbuild.include 370 371# Read KERNELRELEASE from include/config/kernel.release (if it exists) 372KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 373KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 374export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 375 376include $(srctree)/scripts/subarch.include 377 378# Cross compiling and selecting different set of gcc/bin-utils 379# --------------------------------------------------------------------------- 380# 381# When performing cross compilation for other architectures ARCH shall be set 382# to the target architecture. (See arch/* for the possibilities). 383# ARCH can be set during invocation of make: 384# make ARCH=ia64 385# Another way is to have ARCH set in the environment. 386# The default ARCH is the host where make is executed. 387 388# CROSS_COMPILE specify the prefix used for all executables used 389# during compilation. Only gcc and related bin-utils executables 390# are prefixed with $(CROSS_COMPILE). 391# CROSS_COMPILE can be set on the command line 392# make CROSS_COMPILE=ia64-linux- 393# Alternatively CROSS_COMPILE can be set in the environment. 394# Default value for CROSS_COMPILE is not to prefix executables 395# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 396ARCH ?= $(SUBARCH) 397 398# Architecture as present in compile.h 399UTS_MACHINE := $(ARCH) 400SRCARCH := $(ARCH) 401 402# Additional ARCH settings for x86 403ifeq ($(ARCH),i386) 404 SRCARCH := x86 405endif 406ifeq ($(ARCH),x86_64) 407 SRCARCH := x86 408endif 409 410# Additional ARCH settings for sparc 411ifeq ($(ARCH),sparc32) 412 SRCARCH := sparc 413endif 414ifeq ($(ARCH),sparc64) 415 SRCARCH := sparc 416endif 417 418# Additional ARCH settings for parisc 419ifeq ($(ARCH),parisc64) 420 SRCARCH := parisc 421endif 422 423export cross_compiling := 424ifneq ($(SRCARCH),$(SUBARCH)) 425cross_compiling := 1 426endif 427 428KCONFIG_CONFIG ?= .config 429export KCONFIG_CONFIG 430 431# SHELL used by kbuild 432CONFIG_SHELL := sh 433 434HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 435HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 436HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 437 438ifneq ($(LLVM),) 439ifneq ($(filter %/,$(LLVM)),) 440LLVM_PREFIX := $(LLVM) 441else ifneq ($(filter -%,$(LLVM)),) 442LLVM_SUFFIX := $(LLVM) 443endif 444 445HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 446HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 447else 448HOSTCC = gcc 449HOSTCXX = g++ 450endif 451HOSTRUSTC = rustc 452HOSTPKG_CONFIG = pkg-config 453 454KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 455 -O2 -fomit-frame-pointer -std=gnu11 \ 456 -Wdeclaration-after-statement 457KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 458KBUILD_USERLDFLAGS := $(USERLDFLAGS) 459 460# These flags apply to all Rust code in the tree, including the kernel and 461# host programs. 462export rust_common_flags := --edition=2021 \ 463 -Zbinary_dep_depinfo=y \ 464 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 465 -Dunreachable_pub -Dnon_ascii_idents \ 466 -Wmissing_docs \ 467 -Drustdoc::missing_crate_level_docs \ 468 -Dclippy::correctness -Dclippy::style \ 469 -Dclippy::suspicious -Dclippy::complexity \ 470 -Dclippy::perf \ 471 -Dclippy::let_unit_value -Dclippy::mut_mut \ 472 -Dclippy::needless_bitwise_bool \ 473 -Dclippy::needless_continue \ 474 -Wclippy::dbg_macro 475 476KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 477KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 478KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 479 -Zallow-features= $(HOSTRUSTFLAGS) 480KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 481KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 482 483# Make variables (CC, etc...) 484CPP = $(CC) -E 485ifneq ($(LLVM),) 486CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 487LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 488AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 489NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 490OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 491OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 492READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 493STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 494else 495CC = $(CROSS_COMPILE)gcc 496LD = $(CROSS_COMPILE)ld 497AR = $(CROSS_COMPILE)ar 498NM = $(CROSS_COMPILE)nm 499OBJCOPY = $(CROSS_COMPILE)objcopy 500OBJDUMP = $(CROSS_COMPILE)objdump 501READELF = $(CROSS_COMPILE)readelf 502STRIP = $(CROSS_COMPILE)strip 503endif 504RUSTC = rustc 505RUSTDOC = rustdoc 506RUSTFMT = rustfmt 507CLIPPY_DRIVER = clippy-driver 508BINDGEN = bindgen 509CARGO = cargo 510PAHOLE = pahole 511RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 512LEX = flex 513YACC = bison 514AWK = awk 515INSTALLKERNEL := installkernel 516DEPMOD = depmod 517PERL = perl 518PYTHON3 = python3 519CHECK = sparse 520BASH = bash 521KGZIP = gzip 522KBZIP2 = bzip2 523KLZOP = lzop 524LZMA = lzma 525LZ4 = lz4c 526XZ = xz 527ZSTD = zstd 528 529PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 530 531CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 532 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 533NOSTDINC_FLAGS := 534CFLAGS_MODULE = 535RUSTFLAGS_MODULE = 536AFLAGS_MODULE = 537LDFLAGS_MODULE = 538CFLAGS_KERNEL = 539RUSTFLAGS_KERNEL = 540AFLAGS_KERNEL = 541export LDFLAGS_vmlinux = 542 543# Use USERINCLUDE when you must reference the UAPI directories only. 544USERINCLUDE := \ 545 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 546 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 547 -I$(srctree)/include/uapi \ 548 -I$(objtree)/include/generated/uapi \ 549 -include $(srctree)/include/linux/compiler-version.h \ 550 -include $(srctree)/include/linux/kconfig.h 551 552# Use LINUXINCLUDE when you must reference the include/ directory. 553# Needed to be compatible with the O= option 554LINUXINCLUDE := \ 555 -I$(srctree)/arch/$(SRCARCH)/include \ 556 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 557 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 558 -I$(objtree)/include \ 559 $(USERINCLUDE) 560 561KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 562KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 563 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 564 -Werror=implicit-function-declaration -Werror=implicit-int \ 565 -Werror=return-type -Wno-format-security \ 566 -std=gnu11 567KBUILD_CPPFLAGS := -D__KERNEL__ 568KBUILD_RUSTFLAGS := $(rust_common_flags) \ 569 --target=$(objtree)/rust/target.json \ 570 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 571 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 572 -Csymbol-mangling-version=v0 \ 573 -Crelocation-model=static \ 574 -Zfunction-sections=n \ 575 -Dclippy::float_arithmetic 576 577KBUILD_AFLAGS_KERNEL := 578KBUILD_CFLAGS_KERNEL := 579KBUILD_RUSTFLAGS_KERNEL := 580KBUILD_AFLAGS_MODULE := -DMODULE 581KBUILD_CFLAGS_MODULE := -DMODULE 582KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 583KBUILD_LDFLAGS_MODULE := 584KBUILD_LDFLAGS := 585CLANG_FLAGS := 586 587ifeq ($(KBUILD_CLIPPY),1) 588 RUSTC_OR_CLIPPY_QUIET := CLIPPY 589 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 590else 591 RUSTC_OR_CLIPPY_QUIET := RUSTC 592 RUSTC_OR_CLIPPY = $(RUSTC) 593endif 594 595ifdef RUST_LIB_SRC 596 export RUST_LIB_SRC 597endif 598 599# Allows the usage of unstable features in stable compilers. 600export RUSTC_BOOTSTRAP := 1 601 602export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 603export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 604export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 605export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 606export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 607export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 608export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 609export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 610 611export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 612export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 613export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 614export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 615export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 616export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 617export PAHOLE_FLAGS 618 619# Files to ignore in find ... statements 620 621export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 622 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 623 -prune -o 624export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 625 --exclude CVS --exclude .pc --exclude .hg --exclude .git 626 627# =========================================================================== 628# Rules shared between *config targets and build targets 629 630# Basic helpers built in scripts/basic/ 631PHONY += scripts_basic 632scripts_basic: 633 $(Q)$(MAKE) $(build)=scripts/basic 634 635PHONY += outputmakefile 636ifdef building_out_of_srctree 637# Before starting out-of-tree build, make sure the source tree is clean. 638# outputmakefile generates a Makefile in the output directory, if using a 639# separate output directory. This allows convenient use of make in the 640# output directory. 641# At the same time when output Makefile generated, generate .gitignore to 642# ignore whole output directory 643 644quiet_cmd_makefile = GEN Makefile 645 cmd_makefile = { \ 646 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 647 echo "include $(srctree)/Makefile"; \ 648 } > Makefile 649 650outputmakefile: 651 @if [ -f $(srctree)/.config -o \ 652 -d $(srctree)/include/config -o \ 653 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 654 echo >&2 "***"; \ 655 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 656 echo >&2 "*** in $(abs_srctree)";\ 657 echo >&2 "***"; \ 658 false; \ 659 fi 660 $(Q)ln -fsn $(srctree) source 661 $(call cmd,makefile) 662 $(Q)test -e .gitignore || \ 663 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 664endif 665 666# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 667# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 668# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 669# and from include/config/auto.conf.cmd to detect the compiler upgrade. 670CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 671 672ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 673include $(srctree)/scripts/Makefile.clang 674endif 675 676# Include this also for config targets because some architectures need 677# cc-cross-prefix to determine CROSS_COMPILE. 678ifdef need-compiler 679include $(srctree)/scripts/Makefile.compiler 680endif 681 682ifdef config-build 683# =========================================================================== 684# *config targets only - make sure prerequisites are updated, and descend 685# in scripts/kconfig to make the *config target 686 687# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 688# KBUILD_DEFCONFIG may point out an alternative default configuration 689# used for 'make defconfig' 690include $(srctree)/arch/$(SRCARCH)/Makefile 691export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 692 693config: outputmakefile scripts_basic FORCE 694 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 695 696%config: outputmakefile scripts_basic FORCE 697 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 698 699else #!config-build 700# =========================================================================== 701# Build targets only - this includes vmlinux, arch specific targets, clean 702# targets and others. In general all targets except *config targets. 703 704# If building an external module we do not care about the all: rule 705# but instead __all depend on modules 706PHONY += all 707ifeq ($(KBUILD_EXTMOD),) 708__all: all 709else 710__all: modules 711endif 712 713targets := 714 715# Decide whether to build built-in, modular, or both. 716# Normally, just do built-in. 717 718KBUILD_MODULES := 719KBUILD_BUILTIN := 1 720 721# If we have only "make modules", don't compile built-in objects. 722ifeq ($(MAKECMDGOALS),modules) 723 KBUILD_BUILTIN := 724endif 725 726# If we have "make <whatever> modules", compile modules 727# in addition to whatever we do anyway. 728# Just "make" or "make all" shall build modules as well 729 730ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 731 KBUILD_MODULES := 1 732endif 733 734ifeq ($(MAKECMDGOALS),) 735 KBUILD_MODULES := 1 736endif 737 738export KBUILD_MODULES KBUILD_BUILTIN 739 740ifdef need-config 741include include/config/auto.conf 742endif 743 744ifeq ($(KBUILD_EXTMOD),) 745# Objects we will link into vmlinux / subdirs we need to visit 746core-y := 747drivers-y := 748libs-y := lib/ 749endif # KBUILD_EXTMOD 750 751# The all: target is the default when no target is given on the 752# command line. 753# This allow a user to issue only 'make' to build a kernel including modules 754# Defaults to vmlinux, but the arch makefile usually adds further targets 755all: vmlinux 756 757CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 758ifdef CONFIG_CC_IS_GCC 759CFLAGS_GCOV += -fno-tree-loop-im 760endif 761export CFLAGS_GCOV 762 763# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 764ifdef CONFIG_FUNCTION_TRACER 765 CC_FLAGS_FTRACE := -pg 766endif 767 768include $(srctree)/arch/$(SRCARCH)/Makefile 769 770ifdef need-config 771ifdef may-sync-config 772# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 773# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 774# because some architectures define CROSS_COMPILE there. 775include include/config/auto.conf.cmd 776 777$(KCONFIG_CONFIG): 778 @echo >&2 '***' 779 @echo >&2 '*** Configuration file "$@" not found!' 780 @echo >&2 '***' 781 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 782 @echo >&2 '*** "make menuconfig" or "make xconfig").' 783 @echo >&2 '***' 784 @/bin/false 785 786# The actual configuration files used during the build are stored in 787# include/generated/ and include/config/. Update them if .config is newer than 788# include/config/auto.conf (which mirrors .config). 789# 790# This exploits the 'multi-target pattern rule' trick. 791# The syncconfig should be executed only once to make all the targets. 792# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 793# 794# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 795# so you cannot notice that Kconfig is waiting for the user input. 796%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 797 $(Q)$(kecho) " SYNC $@" 798 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 799else # !may-sync-config 800# External modules and some install targets need include/generated/autoconf.h 801# and include/config/auto.conf but do not care if they are up-to-date. 802# Use auto.conf to trigger the test 803PHONY += include/config/auto.conf 804 805include/config/auto.conf: 806 @test -e include/generated/autoconf.h -a -e $@ || ( \ 807 echo >&2; \ 808 echo >&2 " ERROR: Kernel configuration is invalid."; \ 809 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 810 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 811 echo >&2 ; \ 812 /bin/false) 813 814endif # may-sync-config 815endif # need-config 816 817KBUILD_CFLAGS += -fno-delete-null-pointer-checks 818KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 819KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 820KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 821KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 822 823ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 824KBUILD_CFLAGS += -O2 825KBUILD_RUSTFLAGS += -Copt-level=2 826else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 827KBUILD_CFLAGS += -Os 828KBUILD_RUSTFLAGS += -Copt-level=s 829endif 830 831# Always set `debug-assertions` and `overflow-checks` because their default 832# depends on `opt-level` and `debug-assertions`, respectively. 833KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 834KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 835 836# Tell gcc to never replace conditional load with a non-conditional one 837ifdef CONFIG_CC_IS_GCC 838# gcc-10 renamed --param=allow-store-data-races=0 to 839# -fno-allow-store-data-races. 840KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 841KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 842endif 843 844ifdef CONFIG_READABLE_ASM 845# Disable optimizations that make assembler listings hard to read. 846# reorder blocks reorders the control in the function 847# ipa clone creates specialized cloned functions 848# partial inlining inlines only parts of functions 849KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 850endif 851 852ifneq ($(CONFIG_FRAME_WARN),0) 853KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 854endif 855 856stackp-flags-y := -fno-stack-protector 857stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 858stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 859 860KBUILD_CFLAGS += $(stackp-flags-y) 861 862KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 863KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 864 865KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 866KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 867 868ifdef CONFIG_CC_IS_CLANG 869KBUILD_CPPFLAGS += -Qunused-arguments 870# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 871KBUILD_CFLAGS += -Wno-gnu 872else 873 874# gcc inanely warns about local variables called 'main' 875KBUILD_CFLAGS += -Wno-main 876endif 877 878# These warnings generated too much noise in a regular build. 879# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 880KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 881KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 882 883# These result in bogus false positives 884KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 885 886ifdef CONFIG_FRAME_POINTER 887KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 888KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 889else 890# Some targets (ARM with Thumb2, for example), can't be built with frame 891# pointers. For those, we don't have FUNCTION_TRACER automatically 892# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 893# incompatible with -fomit-frame-pointer with current GCC, so we don't use 894# -fomit-frame-pointer with FUNCTION_TRACER. 895# In the Rust target specification, "frame-pointer" is set explicitly 896# to "may-omit". 897ifndef CONFIG_FUNCTION_TRACER 898KBUILD_CFLAGS += -fomit-frame-pointer 899endif 900endif 901 902# Initialize all stack variables with a 0xAA pattern. 903ifdef CONFIG_INIT_STACK_ALL_PATTERN 904KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 905endif 906 907# Initialize all stack variables with a zero value. 908ifdef CONFIG_INIT_STACK_ALL_ZERO 909KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 910ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 911# https://github.com/llvm/llvm-project/issues/44842 912KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 913endif 914endif 915 916# While VLAs have been removed, GCC produces unreachable stack probes 917# for the randomize_kstack_offset feature. Disable it for all compilers. 918KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 919 920# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 921ifdef CONFIG_ZERO_CALL_USED_REGS 922KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 923endif 924 925ifdef CONFIG_FUNCTION_TRACER 926ifdef CONFIG_FTRACE_MCOUNT_USE_CC 927 CC_FLAGS_FTRACE += -mrecord-mcount 928 ifdef CONFIG_HAVE_NOP_MCOUNT 929 ifeq ($(call cc-option-yn, -mnop-mcount),y) 930 CC_FLAGS_FTRACE += -mnop-mcount 931 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 932 endif 933 endif 934endif 935ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 936 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 937endif 938ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 939 ifdef CONFIG_HAVE_C_RECORDMCOUNT 940 BUILD_C_RECORDMCOUNT := y 941 export BUILD_C_RECORDMCOUNT 942 endif 943endif 944ifdef CONFIG_HAVE_FENTRY 945 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 946 ifeq ($(call cc-option-yn, -mfentry),y) 947 CC_FLAGS_FTRACE += -mfentry 948 CC_FLAGS_USING += -DCC_USING_FENTRY 949 endif 950endif 951export CC_FLAGS_FTRACE 952KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 953KBUILD_AFLAGS += $(CC_FLAGS_USING) 954endif 955 956# We trigger additional mismatches with less inlining 957ifdef CONFIG_DEBUG_SECTION_MISMATCH 958KBUILD_CFLAGS += -fno-inline-functions-called-once 959endif 960 961# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 962ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 963KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 964KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 965LDFLAGS_vmlinux += --gc-sections 966endif 967 968ifdef CONFIG_SHADOW_CALL_STACK 969CC_FLAGS_SCS := -fsanitize=shadow-call-stack 970KBUILD_CFLAGS += $(CC_FLAGS_SCS) 971export CC_FLAGS_SCS 972endif 973 974ifdef CONFIG_LTO_CLANG 975ifdef CONFIG_LTO_CLANG_THIN 976CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 977KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 978else 979CC_FLAGS_LTO := -flto 980endif 981CC_FLAGS_LTO += -fvisibility=hidden 982 983# Limit inlining across translation units to reduce binary size 984KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 985 986# Check for frame size exceeding threshold during prolog/epilog insertion 987# when using lld < 13.0.0. 988ifneq ($(CONFIG_FRAME_WARN),0) 989ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 990KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 991endif 992endif 993endif 994 995ifdef CONFIG_LTO 996KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 997KBUILD_AFLAGS += -fno-lto 998export CC_FLAGS_LTO 999endif 1000 1001ifdef CONFIG_CFI_CLANG 1002CC_FLAGS_CFI := -fsanitize=kcfi 1003KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1004export CC_FLAGS_CFI 1005endif 1006 1007ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 1008KBUILD_CFLAGS += -falign-functions=64 1009endif 1010 1011# arch Makefile may override CC so keep this after arch Makefile is included 1012NOSTDINC_FLAGS += -nostdinc 1013 1014# warn about C99 declaration after statement 1015KBUILD_CFLAGS += -Wdeclaration-after-statement 1016 1017# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1018KBUILD_CFLAGS += -Wvla 1019 1020# disable pointer signed / unsigned warnings in gcc 4.0 1021KBUILD_CFLAGS += -Wno-pointer-sign 1022 1023# In order to make sure new function cast mismatches are not introduced 1024# in the kernel (to avoid tripping CFI checking), the kernel should be 1025# globally built with -Wcast-function-type. 1026KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1027 1028# disable stringop warnings in gcc 8+ 1029KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1030 1031# We'll want to enable this eventually, but it's not going away for 5.7 at least 1032KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1033 1034# Another good warning that we'll want to enable eventually 1035KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1036 1037# Enabled with W=2, disabled by default as noisy 1038ifdef CONFIG_CC_IS_GCC 1039KBUILD_CFLAGS += -Wno-maybe-uninitialized 1040endif 1041 1042# The allocators already balk at large sizes, so silence the compiler 1043# warnings for bounds checks involving those possible values. While 1044# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1045# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1046# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1047# doesn't work (as it is documented to), silently resolving to "0" prior to 1048# version 9.1 (and producing an error more recently). Numeric values larger 1049# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1050# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1051# choice, we must perform a versioned check to disable this warning. 1052# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1053KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1054KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1055 1056# disable invalid "can't wrap" optimizations for signed / pointers 1057KBUILD_CFLAGS += -fno-strict-overflow 1058 1059# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1060KBUILD_CFLAGS += -fno-stack-check 1061 1062# conserve stack if available 1063ifdef CONFIG_CC_IS_GCC 1064KBUILD_CFLAGS += -fconserve-stack 1065endif 1066 1067# Prohibit date/time macros, which would make the build non-deterministic 1068KBUILD_CFLAGS += -Werror=date-time 1069 1070# enforce correct pointer usage 1071KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1072 1073# Require designated initializers for all marked structures 1074KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1075 1076# change __FILE__ to the relative path from the srctree 1077KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1078 1079# include additional Makefiles when needed 1080include-y := scripts/Makefile.extrawarn 1081include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1082include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1083include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1084include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1085include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1086include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1087include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1088include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1089 1090include $(addprefix $(srctree)/, $(include-y)) 1091 1092# scripts/Makefile.gcc-plugins is intentionally included last. 1093# Do not add $(call cc-option,...) below this line. When you build the kernel 1094# from the clean source tree, the GCC plugins do not exist at this point. 1095 1096# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1097KBUILD_CPPFLAGS += $(KCPPFLAGS) 1098KBUILD_AFLAGS += $(KAFLAGS) 1099KBUILD_CFLAGS += $(KCFLAGS) 1100KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1101 1102KBUILD_LDFLAGS_MODULE += --build-id=sha1 1103LDFLAGS_vmlinux += --build-id=sha1 1104 1105KBUILD_LDFLAGS += -z noexecstack 1106ifeq ($(CONFIG_LD_IS_BFD),y) 1107KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1108endif 1109 1110ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1111LDFLAGS_vmlinux += -X 1112endif 1113 1114ifeq ($(CONFIG_RELR),y) 1115LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1116endif 1117 1118# We never want expected sections to be placed heuristically by the 1119# linker. All sections should be explicitly named in the linker script. 1120ifdef CONFIG_LD_ORPHAN_WARN 1121LDFLAGS_vmlinux += --orphan-handling=warn 1122endif 1123 1124# Align the bit size of userspace programs with the kernel 1125KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1126KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1127 1128# make the checker run with the right architecture 1129CHECKFLAGS += --arch=$(ARCH) 1130 1131# insure the checker run with the right endianness 1132CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1133 1134# the checker needs the correct machine size 1135CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1136 1137# Default kernel image to build when no specific target is given. 1138# KBUILD_IMAGE may be overruled on the command line or 1139# set in the environment 1140# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1141# this default value 1142export KBUILD_IMAGE ?= vmlinux 1143 1144# 1145# INSTALL_PATH specifies where to place the updated kernel and system map 1146# images. Default is /boot, but you can set it to other values 1147export INSTALL_PATH ?= /boot 1148 1149# 1150# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1151# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1152# an argument if needed. Otherwise it defaults to the kernel install path 1153# 1154export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1155 1156# 1157# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1158# relocations required by build roots. This is not defined in the 1159# makefile but the argument can be passed to make if needed. 1160# 1161 1162MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1163export MODLIB 1164 1165PHONY += prepare0 1166 1167export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1168export MODORDER := $(extmod_prefix)modules.order 1169export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1170 1171ifeq ($(KBUILD_EXTMOD),) 1172 1173build-dir := . 1174clean-dirs := $(sort . Documentation \ 1175 $(patsubst %/,%,$(filter %/, $(core-) \ 1176 $(drivers-) $(libs-)))) 1177 1178export ARCH_CORE := $(core-y) 1179export ARCH_LIB := $(filter %/, $(libs-y)) 1180export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1181# Externally visible symbols (used by link-vmlinux.sh) 1182 1183KBUILD_VMLINUX_OBJS := ./built-in.a 1184ifdef CONFIG_MODULES 1185KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1186KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1187else 1188KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1189endif 1190 1191export KBUILD_VMLINUX_LIBS 1192export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1193 1194# Recurse until adjust_autoksyms.sh is satisfied 1195PHONY += autoksyms_recursive 1196ifdef CONFIG_TRIM_UNUSED_KSYMS 1197# For the kernel to actually contain only the needed exported symbols, 1198# we have to build modules as well to determine what those symbols are. 1199# (this can be evaluated only once include/config/auto.conf has been included) 1200KBUILD_MODULES := 1 1201 1202autoksyms_recursive: $(build-dir) modules.order 1203 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1204 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1205endif 1206 1207autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1208 1209quiet_cmd_autoksyms_h = GEN $@ 1210 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1211 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1212 1213$(autoksyms_h): 1214 $(call cmd,autoksyms_h) 1215 1216# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1217quiet_cmd_ar_vmlinux.a = AR $@ 1218 cmd_ar_vmlinux.a = \ 1219 rm -f $@; \ 1220 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1221 $(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt) 1222 1223targets += vmlinux.a 1224vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1225 $(call if_changed,ar_vmlinux.a) 1226 1227PHONY += vmlinux_o 1228vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1229 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1230 1231vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1232 @: 1233 1234PHONY += vmlinux 1235vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1236 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1237 1238# The actual objects are generated when descending, 1239# make sure no implicit rule kicks in 1240$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1241 1242filechk_kernel.release = \ 1243 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1244 1245# Store (new) KERNELRELEASE string in include/config/kernel.release 1246include/config/kernel.release: FORCE 1247 $(call filechk,kernel.release) 1248 1249# Additional helpers built in scripts/ 1250# Carefully list dependencies so we do not try to build scripts twice 1251# in parallel 1252PHONY += scripts 1253scripts: scripts_basic scripts_dtc 1254 $(Q)$(MAKE) $(build)=$(@) 1255 1256# Things we need to do before we recursively start building the kernel 1257# or the modules are listed in "prepare". 1258# A multi level approach is used. prepareN is processed before prepareN-1. 1259# archprepare is used in arch Makefiles and when processed asm symlink, 1260# version.h and scripts_basic is processed / created. 1261 1262PHONY += prepare archprepare 1263 1264archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1265 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1266 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1267 1268prepare0: archprepare 1269 $(Q)$(MAKE) $(build)=scripts/mod 1270 $(Q)$(MAKE) $(build)=. prepare 1271 1272# All the preparing.. 1273prepare: prepare0 1274ifdef CONFIG_RUST 1275 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1276 $(Q)$(MAKE) $(build)=rust 1277endif 1278 1279PHONY += remove-stale-files 1280remove-stale-files: 1281 $(Q)$(srctree)/scripts/remove-stale-files 1282 1283# Support for using generic headers in asm-generic 1284asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1285 1286PHONY += asm-generic uapi-asm-generic 1287asm-generic: uapi-asm-generic 1288 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1289 generic=include/asm-generic 1290uapi-asm-generic: 1291 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1292 generic=include/uapi/asm-generic 1293 1294# Generate some files 1295# --------------------------------------------------------------------------- 1296 1297# KERNELRELEASE can change from a few different places, meaning version.h 1298# needs to be updated, so this check is forced on all builds 1299 1300uts_len := 64 1301define filechk_utsrelease.h 1302 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1303 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1304 exit 1; \ 1305 fi; \ 1306 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1307endef 1308 1309define filechk_version.h 1310 if [ $(SUBLEVEL) -gt 255 ]; then \ 1311 echo \#define LINUX_VERSION_CODE $(shell \ 1312 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1313 else \ 1314 echo \#define LINUX_VERSION_CODE $(shell \ 1315 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1316 fi; \ 1317 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1318 ((c) > 255 ? 255 : (c)))'; \ 1319 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1320 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1321 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1322endef 1323 1324$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1325$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1326$(version_h): FORCE 1327 $(call filechk,version.h) 1328 1329include/generated/utsrelease.h: include/config/kernel.release FORCE 1330 $(call filechk,utsrelease.h) 1331 1332filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1333 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1334 1335include/generated/compile.h: FORCE 1336 $(call filechk,compile.h) 1337 1338PHONY += headerdep 1339headerdep: 1340 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1341 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1342 1343# --------------------------------------------------------------------------- 1344# Kernel headers 1345 1346#Default location for installed headers 1347export INSTALL_HDR_PATH = $(objtree)/usr 1348 1349quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1350 cmd_headers_install = \ 1351 mkdir -p $(INSTALL_HDR_PATH); \ 1352 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1353 usr/include $(INSTALL_HDR_PATH) 1354 1355PHONY += headers_install 1356headers_install: headers 1357 $(call cmd,headers_install) 1358 1359PHONY += archheaders archscripts 1360 1361hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1362 1363PHONY += headers 1364headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1365 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1366 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1367 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1368 1369ifdef CONFIG_HEADERS_INSTALL 1370prepare: headers 1371endif 1372 1373PHONY += scripts_unifdef 1374scripts_unifdef: scripts_basic 1375 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1376 1377# --------------------------------------------------------------------------- 1378# Install 1379 1380# Many distributions have the custom install script, /sbin/installkernel. 1381# If DKMS is installed, 'make install' will eventually recurse back 1382# to this Makefile to build and install external modules. 1383# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1384 1385quiet_cmd_install = INSTALL $(INSTALL_PATH) 1386 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1387 1388# --------------------------------------------------------------------------- 1389# Tools 1390 1391ifdef CONFIG_OBJTOOL 1392prepare: tools/objtool 1393endif 1394 1395ifdef CONFIG_BPF 1396ifdef CONFIG_DEBUG_INFO_BTF 1397prepare: tools/bpf/resolve_btfids 1398endif 1399endif 1400 1401PHONY += resolve_btfids_clean 1402 1403resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1404 1405# tools/bpf/resolve_btfids directory might not exist 1406# in output directory, skip its clean in that case 1407resolve_btfids_clean: 1408ifneq ($(wildcard $(resolve_btfids_O)),) 1409 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1410endif 1411 1412# Clear a bunch of variables before executing the submake 1413ifeq ($(quiet),silent_) 1414tools_silent=s 1415endif 1416 1417tools/: FORCE 1418 $(Q)mkdir -p $(objtree)/tools 1419 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1420 1421tools/%: FORCE 1422 $(Q)mkdir -p $(objtree)/tools 1423 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1424 1425# --------------------------------------------------------------------------- 1426# Kernel selftest 1427 1428PHONY += kselftest 1429kselftest: headers 1430 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1431 1432kselftest-%: headers FORCE 1433 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1434 1435PHONY += kselftest-merge 1436kselftest-merge: 1437 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1438 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1439 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1440 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1441 1442# --------------------------------------------------------------------------- 1443# Devicetree files 1444 1445ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1446dtstree := arch/$(SRCARCH)/boot/dts 1447endif 1448 1449ifneq ($(dtstree),) 1450 1451%.dtb: dtbs_prepare 1452 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1453 1454%.dtbo: dtbs_prepare 1455 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1456 1457PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1458dtbs: dtbs_prepare 1459 $(Q)$(MAKE) $(build)=$(dtstree) 1460 1461# include/config/kernel.release is actually needed when installing DTBs because 1462# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1463# dtbs_install depend on it as dtbs_install may run as root. 1464dtbs_prepare: include/config/kernel.release scripts_dtc 1465 1466ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1467export CHECK_DTBS=y 1468dtbs: dt_binding_check 1469endif 1470 1471dtbs_check: dtbs 1472 1473dtbs_install: 1474 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1475 1476ifdef CONFIG_OF_EARLY_FLATTREE 1477all: dtbs 1478endif 1479 1480endif 1481 1482PHONY += scripts_dtc 1483scripts_dtc: scripts_basic 1484 $(Q)$(MAKE) $(build)=scripts/dtc 1485 1486ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1487export CHECK_DT_BINDING=y 1488endif 1489 1490PHONY += dt_binding_check 1491dt_binding_check: scripts_dtc 1492 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1493 1494PHONY += dt_compatible_check 1495dt_compatible_check: dt_binding_check 1496 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1497 1498# --------------------------------------------------------------------------- 1499# Modules 1500 1501ifdef CONFIG_MODULES 1502 1503# By default, build modules as well 1504 1505all: modules 1506 1507# When we're building modules with modversions, we need to consider 1508# the built-in objects during the descend as well, in order to 1509# make sure the checksums are up to date before we record them. 1510ifdef CONFIG_MODVERSIONS 1511 KBUILD_BUILTIN := 1 1512endif 1513 1514# Build modules 1515# 1516 1517# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES 1518# is an exception. 1519ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1520modules: vmlinux 1521endif 1522 1523modules: modules_prepare 1524 1525# Target to prepare building external modules 1526modules_prepare: prepare 1527 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1528 1529export modules_sign_only := 1530 1531ifeq ($(CONFIG_MODULE_SIG),y) 1532PHONY += modules_sign 1533modules_sign: modules_install 1534 @: 1535 1536# modules_sign is a subset of modules_install. 1537# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1538ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1539modules_sign_only := y 1540endif 1541endif 1542 1543modinst_pre := 1544ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1545modinst_pre := __modinst_pre 1546endif 1547 1548modules_install: $(modinst_pre) 1549PHONY += __modinst_pre 1550__modinst_pre: 1551 @rm -rf $(MODLIB)/kernel 1552 @rm -f $(MODLIB)/source 1553 @mkdir -p $(MODLIB)/kernel 1554 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1555 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1556 rm -f $(MODLIB)/build ; \ 1557 ln -s $(CURDIR) $(MODLIB)/build ; \ 1558 fi 1559 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1560 @cp -f modules.builtin $(MODLIB)/ 1561 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1562 1563endif # CONFIG_MODULES 1564 1565### 1566# Cleaning is done on three levels. 1567# make clean Delete most generated files 1568# Leave enough to build external modules 1569# make mrproper Delete the current configuration, and all generated files 1570# make distclean Remove editor backup files, patch leftover files and the like 1571 1572# Directories & files removed with 'make clean' 1573CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1574 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1575 compile_commands.json .thinlto-cache rust/test rust/doc \ 1576 .vmlinux.objs .vmlinux.export.c 1577 1578# Directories & files removed with 'make mrproper' 1579MRPROPER_FILES += include/config include/generated \ 1580 arch/$(SRCARCH)/include/generated .objdiff \ 1581 debian snap tar-install \ 1582 .config .config.old .version \ 1583 Module.symvers \ 1584 certs/signing_key.pem \ 1585 certs/x509.genkey \ 1586 vmlinux-gdb.py \ 1587 *.spec \ 1588 rust/target.json rust/libmacros.so 1589 1590# clean - Delete most, but leave enough to build external modules 1591# 1592clean: rm-files := $(CLEAN_FILES) 1593 1594PHONY += archclean vmlinuxclean 1595 1596vmlinuxclean: 1597 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1598 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1599 1600clean: archclean vmlinuxclean resolve_btfids_clean 1601 1602# mrproper - Delete all generated files, including .config 1603# 1604mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1605mrproper-dirs := $(addprefix _mrproper_,scripts) 1606 1607PHONY += $(mrproper-dirs) mrproper 1608$(mrproper-dirs): 1609 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1610 1611mrproper: clean $(mrproper-dirs) 1612 $(call cmd,rmfiles) 1613 @find . $(RCS_FIND_IGNORE) \ 1614 \( -name '*.rmeta' \) \ 1615 -type f -print | xargs rm -f 1616 1617# distclean 1618# 1619PHONY += distclean 1620 1621distclean: mrproper 1622 @find . $(RCS_FIND_IGNORE) \ 1623 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1624 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1625 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1626 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1627 -type f -print | xargs rm -f 1628 1629 1630# Packaging of the kernel to various formats 1631# --------------------------------------------------------------------------- 1632 1633%src-pkg: FORCE 1634 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1635%pkg: include/config/kernel.release FORCE 1636 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1637 1638# Brief documentation of the typical targets used 1639# --------------------------------------------------------------------------- 1640 1641boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1642boards := $(sort $(notdir $(boards))) 1643board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1644board-dirs := $(sort $(notdir $(board-dirs:/=))) 1645 1646PHONY += help 1647help: 1648 @echo 'Cleaning targets:' 1649 @echo ' clean - Remove most generated files but keep the config and' 1650 @echo ' enough build support to build external modules' 1651 @echo ' mrproper - Remove all generated files + config + various backup files' 1652 @echo ' distclean - mrproper + remove editor backup and patch files' 1653 @echo '' 1654 @echo 'Configuration targets:' 1655 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1656 @echo '' 1657 @echo 'Other generic targets:' 1658 @echo ' all - Build all targets marked with [*]' 1659 @echo '* vmlinux - Build the bare kernel' 1660 @echo '* modules - Build all modules' 1661 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1662 @echo ' dir/ - Build all files in dir and below' 1663 @echo ' dir/file.[ois] - Build specified target only' 1664 @echo ' dir/file.ll - Build the LLVM assembly file' 1665 @echo ' (requires compiler support for LLVM assembly generation)' 1666 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1667 @echo ' (requires a recent binutils and recent build (System.map))' 1668 @echo ' dir/file.ko - Build module including final link' 1669 @echo ' modules_prepare - Set up for building external modules' 1670 @echo ' tags/TAGS - Generate tags file for editors' 1671 @echo ' cscope - Generate cscope index' 1672 @echo ' gtags - Generate GNU GLOBAL index' 1673 @echo ' kernelrelease - Output the release version string (use with make -s)' 1674 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1675 @echo ' image_name - Output the image name (use with make -s)' 1676 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1677 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1678 echo '' 1679 @echo 'Static analysers:' 1680 @echo ' checkstack - Generate a list of stack hogs' 1681 @echo ' versioncheck - Sanity check on version.h usage' 1682 @echo ' includecheck - Check for duplicate included header files' 1683 @echo ' export_report - List the usages of all exported symbols' 1684 @echo ' headerdep - Detect inclusion cycles in headers' 1685 @echo ' coccicheck - Check with Coccinelle' 1686 @echo ' clang-analyzer - Check with clang static analyzer' 1687 @echo ' clang-tidy - Check with clang-tidy' 1688 @echo '' 1689 @echo 'Tools:' 1690 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1691 @echo '' 1692 @echo 'Kernel selftest:' 1693 @echo ' kselftest - Build and run kernel selftest' 1694 @echo ' Build, install, and boot kernel before' 1695 @echo ' running kselftest on it' 1696 @echo ' Run as root for full coverage' 1697 @echo ' kselftest-all - Build kernel selftest' 1698 @echo ' kselftest-install - Build and install kernel selftest' 1699 @echo ' kselftest-clean - Remove all generated kselftest files' 1700 @echo ' kselftest-merge - Merge all the config dependencies of' 1701 @echo ' kselftest to existing .config.' 1702 @echo '' 1703 @echo 'Rust targets:' 1704 @echo ' rustavailable - Checks whether the Rust toolchain is' 1705 @echo ' available and, if not, explains why.' 1706 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1707 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1708 @echo ' is formatted, printing a diff otherwise.' 1709 @echo ' rustdoc - Generate Rust documentation' 1710 @echo ' (requires kernel .config)' 1711 @echo ' rusttest - Runs the Rust tests' 1712 @echo ' (requires kernel .config; downloads external repos)' 1713 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1714 @echo ' (requires kernel .config)' 1715 @echo ' dir/file.[os] - Build specified target only' 1716 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1717 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1718 @echo ' The output is not intended to be compilable.' 1719 @echo ' dir/file.ll - Build the LLVM assembly file' 1720 @echo '' 1721 @$(if $(dtstree), \ 1722 echo 'Devicetree:'; \ 1723 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1724 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1725 echo ' dt_binding_check - Validate device tree binding documents'; \ 1726 echo ' dtbs_check - Validate device tree source files';\ 1727 echo '') 1728 1729 @echo 'Userspace tools targets:' 1730 @echo ' use "make tools/help"' 1731 @echo ' or "cd tools; make help"' 1732 @echo '' 1733 @echo 'Kernel packaging:' 1734 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1735 @echo '' 1736 @echo 'Documentation targets:' 1737 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1738 @echo '' 1739 @echo 'Architecture specific targets ($(SRCARCH)):' 1740 @$(or $(archhelp),\ 1741 echo ' No architecture specific help defined for $(SRCARCH)') 1742 @echo '' 1743 @$(if $(boards), \ 1744 $(foreach b, $(boards), \ 1745 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1746 echo '') 1747 @$(if $(board-dirs), \ 1748 $(foreach b, $(board-dirs), \ 1749 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1750 printf " %-16s - Show all of the above\\n" help-boards; \ 1751 echo '') 1752 1753 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1754 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1755 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1756 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1757 @echo ' (sparse by default)' 1758 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1759 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1760 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1761 @echo ' 1: warnings which may be relevant and do not occur too often' 1762 @echo ' 2: warnings which occur quite often but may still be relevant' 1763 @echo ' 3: more obscure warnings, can most likely be ignored' 1764 @echo ' e: warnings are being treated as errors' 1765 @echo ' Multiple levels can be combined with W=12 or W=123' 1766 @echo '' 1767 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1768 @echo 'For further info see the ./README file' 1769 1770 1771help-board-dirs := $(addprefix help-,$(board-dirs)) 1772 1773help-boards: $(help-board-dirs) 1774 1775boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1776 1777$(help-board-dirs): help-%: 1778 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1779 @$(if $(boards-per-dir), \ 1780 $(foreach b, $(boards-per-dir), \ 1781 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1782 echo '') 1783 1784 1785# Documentation targets 1786# --------------------------------------------------------------------------- 1787DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1788 linkcheckdocs dochelp refcheckdocs 1789PHONY += $(DOC_TARGETS) 1790$(DOC_TARGETS): 1791 $(Q)$(MAKE) $(build)=Documentation $@ 1792 1793 1794# Rust targets 1795# --------------------------------------------------------------------------- 1796 1797# "Is Rust available?" target 1798PHONY += rustavailable 1799rustavailable: 1800 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1801 1802# Documentation target 1803# 1804# Using the singular to avoid running afoul of `no-dot-config-targets`. 1805PHONY += rustdoc 1806rustdoc: prepare 1807 $(Q)$(MAKE) $(build)=rust $@ 1808 1809# Testing target 1810PHONY += rusttest 1811rusttest: prepare 1812 $(Q)$(MAKE) $(build)=rust $@ 1813 1814# Formatting targets 1815PHONY += rustfmt rustfmtcheck 1816 1817# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1818# 1819# We match using absolute paths since `find` does not resolve them 1820# when matching, which is a problem when e.g. `srctree` is `..`. 1821# We `grep` afterwards in order to remove the directory entry itself. 1822rustfmt: 1823 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1824 -o -path $(abs_srctree)/rust/alloc -prune \ 1825 -o -path $(abs_objtree)/rust/test -prune \ 1826 | grep -Fv $(abs_srctree)/rust/alloc \ 1827 | grep -Fv $(abs_objtree)/rust/test \ 1828 | grep -Fv generated \ 1829 | xargs $(RUSTFMT) $(rustfmt_flags) 1830 1831rustfmtcheck: rustfmt_flags = --check 1832rustfmtcheck: rustfmt 1833 1834# IDE support targets 1835PHONY += rust-analyzer 1836rust-analyzer: 1837 $(Q)$(MAKE) $(build)=rust $@ 1838 1839# Misc 1840# --------------------------------------------------------------------------- 1841 1842PHONY += scripts_gdb 1843scripts_gdb: prepare0 1844 $(Q)$(MAKE) $(build)=scripts/gdb 1845 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1846 1847ifdef CONFIG_GDB_SCRIPTS 1848all: scripts_gdb 1849endif 1850 1851else # KBUILD_EXTMOD 1852 1853### 1854# External module support. 1855# When building external modules the kernel used as basis is considered 1856# read-only, and no consistency checks are made and the make 1857# system is not used on the basis kernel. If updates are required 1858# in the basis kernel ordinary make commands (without M=...) must be used. 1859 1860# We are always building only modules. 1861KBUILD_BUILTIN := 1862KBUILD_MODULES := 1 1863 1864build-dir := $(KBUILD_EXTMOD) 1865 1866compile_commands.json: $(extmod_prefix)compile_commands.json 1867PHONY += compile_commands.json 1868 1869clean-dirs := $(KBUILD_EXTMOD) 1870clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1871 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1872 1873PHONY += prepare 1874# now expand this into a simple variable to reduce the cost of shell evaluations 1875prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1876prepare: 1877 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1878 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1879 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1880 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1881 fi 1882 1883PHONY += help 1884help: 1885 @echo ' Building external modules.' 1886 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1887 @echo '' 1888 @echo ' modules - default target, build the module(s)' 1889 @echo ' modules_install - install the module' 1890 @echo ' clean - remove generated files in module directory only' 1891 @echo '' 1892 1893endif # KBUILD_EXTMOD 1894 1895# --------------------------------------------------------------------------- 1896# Modules 1897 1898PHONY += modules modules_install modules_prepare 1899 1900ifdef CONFIG_MODULES 1901 1902$(MODORDER): $(build-dir) 1903 @: 1904 1905# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1906# This is solely useful to speed up test compiles. 1907modules: modpost 1908ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1909 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1910endif 1911 1912PHONY += modules_check 1913modules_check: $(MODORDER) 1914 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1915 1916quiet_cmd_depmod = DEPMOD $(MODLIB) 1917 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1918 $(KERNELRELEASE) 1919 1920modules_install: 1921 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1922 $(call cmd,depmod) 1923 1924else # CONFIG_MODULES 1925 1926# Modules not configured 1927# --------------------------------------------------------------------------- 1928 1929modules modules_install: 1930 @echo >&2 '***' 1931 @echo >&2 '*** The present kernel configuration has modules disabled.' 1932 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1933 @echo >&2 '*** to enable CONFIG_MODULES.' 1934 @echo >&2 '***' 1935 @exit 1 1936 1937KBUILD_MODULES := 1938 1939endif # CONFIG_MODULES 1940 1941PHONY += modpost 1942modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1943 $(if $(KBUILD_MODULES), modules_check) 1944 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1945 1946# Single targets 1947# --------------------------------------------------------------------------- 1948# To build individual files in subdirectories, you can do like this: 1949# 1950# make foo/bar/baz.s 1951# 1952# The supported suffixes for single-target are listed in 'single-targets' 1953# 1954# To build only under specific subdirectories, you can do like this: 1955# 1956# make foo/bar/baz/ 1957 1958ifdef single-build 1959 1960# .ko is special because modpost is needed 1961single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1962single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1963 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1964 1965$(single-ko): single_modules 1966 @: 1967$(single-no-ko): $(build-dir) 1968 @: 1969 1970# Remove MODORDER when done because it is not the real one. 1971PHONY += single_modules 1972single_modules: $(single-no-ko) modules_prepare 1973 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1974 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1975ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1976 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1977endif 1978 $(Q)rm -f $(MODORDER) 1979 1980single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1981 1982KBUILD_MODULES := 1 1983 1984endif 1985 1986# Preset locale variables to speed up the build process. Limit locale 1987# tweaks to this spot to avoid wrong language settings when running 1988# make menuconfig etc. 1989# Error messages still appears in the original language 1990PHONY += $(build-dir) 1991$(build-dir): prepare 1992 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1993 1994clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1995PHONY += $(clean-dirs) clean 1996$(clean-dirs): 1997 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1998 1999clean: $(clean-dirs) 2000 $(call cmd,rmfiles) 2001 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2002 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2003 -o -name '*.ko.*' \ 2004 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 2005 -o -name '*.dwo' -o -name '*.lst' \ 2006 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2007 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2008 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2009 -o -name '*.asn1.[ch]' \ 2010 -o -name '*.symtypes' -o -name 'modules.order' \ 2011 -o -name '.tmp_*' \ 2012 -o -name '*.c.[012]*.*' \ 2013 -o -name '*.ll' \ 2014 -o -name '*.gcno' \ 2015 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 2016 2017# Generate tags for editors 2018# --------------------------------------------------------------------------- 2019quiet_cmd_tags = GEN $@ 2020 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2021 2022tags TAGS cscope gtags: FORCE 2023 $(call cmd,tags) 2024 2025# Script to generate missing namespace dependencies 2026# --------------------------------------------------------------------------- 2027 2028PHONY += nsdeps 2029nsdeps: export KBUILD_NSDEPS=1 2030nsdeps: modules 2031 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2032 2033# Clang Tooling 2034# --------------------------------------------------------------------------- 2035 2036quiet_cmd_gen_compile_commands = GEN $@ 2037 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2038 2039$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2040 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2041 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2042 $(call if_changed,gen_compile_commands) 2043 2044targets += $(extmod_prefix)compile_commands.json 2045 2046PHONY += clang-tidy clang-analyzer 2047 2048ifdef CONFIG_CC_IS_CLANG 2049quiet_cmd_clang_tools = CHECK $< 2050 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2051 2052clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2053 $(call cmd,clang_tools) 2054else 2055clang-tidy clang-analyzer: 2056 @echo "$@ requires CC=clang" >&2 2057 @false 2058endif 2059 2060# Scripts to check various things for consistency 2061# --------------------------------------------------------------------------- 2062 2063PHONY += includecheck versioncheck coccicheck export_report 2064 2065includecheck: 2066 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2067 -name '*.[hcS]' -type f -print | sort \ 2068 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2069 2070versioncheck: 2071 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2072 -name '*.[hcS]' -type f -print | sort \ 2073 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2074 2075coccicheck: 2076 $(Q)$(BASH) $(srctree)/scripts/$@ 2077 2078export_report: 2079 $(PERL) $(srctree)/scripts/export_report.pl 2080 2081PHONY += checkstack kernelrelease kernelversion image_name 2082 2083# UML needs a little special treatment here. It wants to use the host 2084# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2085# else wants $(ARCH), including people doing cross-builds, which means 2086# that $(SUBARCH) doesn't work here. 2087ifeq ($(ARCH), um) 2088CHECKSTACK_ARCH := $(SUBARCH) 2089else 2090CHECKSTACK_ARCH := $(ARCH) 2091endif 2092checkstack: 2093 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2094 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2095 2096kernelrelease: 2097 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 2098 2099kernelversion: 2100 @echo $(KERNELVERSION) 2101 2102image_name: 2103 @echo $(KBUILD_IMAGE) 2104 2105quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2106 cmd_rmfiles = rm -rf $(rm-files) 2107 2108# read saved command lines for existing targets 2109existing-targets := $(wildcard $(sort $(targets))) 2110 2111-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2112 2113endif # config-build 2114endif # mixed-build 2115endif # need-sub-make 2116 2117PHONY += FORCE 2118FORCE: 2119 2120# Declare the contents of the PHONY variable as phony. We keep that 2121# information in a variable so we can use it in if_changed and friends. 2122.PHONY: $(PHONY) 2123