1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = 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 -funsigned-char \ 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 969ifndef CONFIG_DYNAMIC_SCS 970CC_FLAGS_SCS := -fsanitize=shadow-call-stack 971KBUILD_CFLAGS += $(CC_FLAGS_SCS) 972endif 973export CC_FLAGS_SCS 974endif 975 976ifdef CONFIG_LTO_CLANG 977ifdef CONFIG_LTO_CLANG_THIN 978CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 979KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 980else 981CC_FLAGS_LTO := -flto 982endif 983CC_FLAGS_LTO += -fvisibility=hidden 984 985# Limit inlining across translation units to reduce binary size 986KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 987 988# Check for frame size exceeding threshold during prolog/epilog insertion 989# when using lld < 13.0.0. 990ifneq ($(CONFIG_FRAME_WARN),0) 991ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 992KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 993endif 994endif 995endif 996 997ifdef CONFIG_LTO 998KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 999KBUILD_AFLAGS += -fno-lto 1000export CC_FLAGS_LTO 1001endif 1002 1003ifdef CONFIG_CFI_CLANG 1004CC_FLAGS_CFI := -fsanitize=kcfi 1005KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1006export CC_FLAGS_CFI 1007endif 1008 1009ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1010KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1011endif 1012 1013# arch Makefile may override CC so keep this after arch Makefile is included 1014NOSTDINC_FLAGS += -nostdinc 1015 1016# warn about C99 declaration after statement 1017KBUILD_CFLAGS += -Wdeclaration-after-statement 1018 1019# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1020KBUILD_CFLAGS += -Wvla 1021 1022# disable pointer signed / unsigned warnings in gcc 4.0 1023KBUILD_CFLAGS += -Wno-pointer-sign 1024 1025# In order to make sure new function cast mismatches are not introduced 1026# in the kernel (to avoid tripping CFI checking), the kernel should be 1027# globally built with -Wcast-function-type. 1028KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1029 1030# disable stringop warnings in gcc 8+ 1031KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1032 1033# We'll want to enable this eventually, but it's not going away for 5.7 at least 1034KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1035 1036# Another good warning that we'll want to enable eventually 1037KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1038 1039# Enabled with W=2, disabled by default as noisy 1040ifdef CONFIG_CC_IS_GCC 1041KBUILD_CFLAGS += -Wno-maybe-uninitialized 1042endif 1043 1044# The allocators already balk at large sizes, so silence the compiler 1045# warnings for bounds checks involving those possible values. While 1046# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1047# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1048# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1049# doesn't work (as it is documented to), silently resolving to "0" prior to 1050# version 9.1 (and producing an error more recently). Numeric values larger 1051# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1052# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1053# choice, we must perform a versioned check to disable this warning. 1054# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1055KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1056KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1057 1058# disable invalid "can't wrap" optimizations for signed / pointers 1059KBUILD_CFLAGS += -fno-strict-overflow 1060 1061# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1062KBUILD_CFLAGS += -fno-stack-check 1063 1064# conserve stack if available 1065ifdef CONFIG_CC_IS_GCC 1066KBUILD_CFLAGS += -fconserve-stack 1067endif 1068 1069# Prohibit date/time macros, which would make the build non-deterministic 1070KBUILD_CFLAGS += -Werror=date-time 1071 1072# enforce correct pointer usage 1073KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1074 1075# Require designated initializers for all marked structures 1076KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1077 1078# change __FILE__ to the relative path from the srctree 1079KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1080 1081# include additional Makefiles when needed 1082include-y := scripts/Makefile.extrawarn 1083include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1084include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1085include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1086include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1087include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1088include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1089include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1090include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1091 1092include $(addprefix $(srctree)/, $(include-y)) 1093 1094# scripts/Makefile.gcc-plugins is intentionally included last. 1095# Do not add $(call cc-option,...) below this line. When you build the kernel 1096# from the clean source tree, the GCC plugins do not exist at this point. 1097 1098# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1099KBUILD_CPPFLAGS += $(KCPPFLAGS) 1100KBUILD_AFLAGS += $(KAFLAGS) 1101KBUILD_CFLAGS += $(KCFLAGS) 1102KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1103 1104KBUILD_LDFLAGS_MODULE += --build-id=sha1 1105LDFLAGS_vmlinux += --build-id=sha1 1106 1107KBUILD_LDFLAGS += -z noexecstack 1108ifeq ($(CONFIG_LD_IS_BFD),y) 1109KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1110endif 1111 1112ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1113LDFLAGS_vmlinux += -X 1114endif 1115 1116ifeq ($(CONFIG_RELR),y) 1117LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1118endif 1119 1120# We never want expected sections to be placed heuristically by the 1121# linker. All sections should be explicitly named in the linker script. 1122ifdef CONFIG_LD_ORPHAN_WARN 1123LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1124endif 1125 1126# Align the bit size of userspace programs with the kernel 1127KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1128KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1129 1130# make the checker run with the right architecture 1131CHECKFLAGS += --arch=$(ARCH) 1132 1133# insure the checker run with the right endianness 1134CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1135 1136# the checker needs the correct machine size 1137CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1138 1139# Default kernel image to build when no specific target is given. 1140# KBUILD_IMAGE may be overruled on the command line or 1141# set in the environment 1142# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1143# this default value 1144export KBUILD_IMAGE ?= vmlinux 1145 1146# 1147# INSTALL_PATH specifies where to place the updated kernel and system map 1148# images. Default is /boot, but you can set it to other values 1149export INSTALL_PATH ?= /boot 1150 1151# 1152# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1153# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1154# an argument if needed. Otherwise it defaults to the kernel install path 1155# 1156export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1157 1158# 1159# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1160# relocations required by build roots. This is not defined in the 1161# makefile but the argument can be passed to make if needed. 1162# 1163 1164MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1165export MODLIB 1166 1167PHONY += prepare0 1168 1169export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1170export MODORDER := $(extmod_prefix)modules.order 1171export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1172 1173ifeq ($(KBUILD_EXTMOD),) 1174 1175build-dir := . 1176clean-dirs := $(sort . Documentation \ 1177 $(patsubst %/,%,$(filter %/, $(core-) \ 1178 $(drivers-) $(libs-)))) 1179 1180export ARCH_CORE := $(core-y) 1181export ARCH_LIB := $(filter %/, $(libs-y)) 1182export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1183# Externally visible symbols (used by link-vmlinux.sh) 1184 1185KBUILD_VMLINUX_OBJS := ./built-in.a 1186ifdef CONFIG_MODULES 1187KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1188KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1189else 1190KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1191endif 1192 1193export KBUILD_VMLINUX_LIBS 1194export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1195 1196# Recurse until adjust_autoksyms.sh is satisfied 1197PHONY += autoksyms_recursive 1198ifdef CONFIG_TRIM_UNUSED_KSYMS 1199# For the kernel to actually contain only the needed exported symbols, 1200# we have to build modules as well to determine what those symbols are. 1201# (this can be evaluated only once include/config/auto.conf has been included) 1202KBUILD_MODULES := 1 1203 1204autoksyms_recursive: $(build-dir) modules.order 1205 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1206 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1207endif 1208 1209autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1210 1211quiet_cmd_autoksyms_h = GEN $@ 1212 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1213 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1214 1215$(autoksyms_h): 1216 $(call cmd,autoksyms_h) 1217 1218# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1219quiet_cmd_ar_vmlinux.a = AR $@ 1220 cmd_ar_vmlinux.a = \ 1221 rm -f $@; \ 1222 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1223 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1224 1225targets += vmlinux.a 1226vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1227 $(call if_changed,ar_vmlinux.a) 1228 1229PHONY += vmlinux_o 1230vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1231 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1232 1233vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1234 @: 1235 1236PHONY += vmlinux 1237vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1238 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1239 1240# The actual objects are generated when descending, 1241# make sure no implicit rule kicks in 1242$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1243 1244filechk_kernel.release = \ 1245 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1246 1247# Store (new) KERNELRELEASE string in include/config/kernel.release 1248include/config/kernel.release: FORCE 1249 $(call filechk,kernel.release) 1250 1251# Additional helpers built in scripts/ 1252# Carefully list dependencies so we do not try to build scripts twice 1253# in parallel 1254PHONY += scripts 1255scripts: scripts_basic scripts_dtc 1256 $(Q)$(MAKE) $(build)=$(@) 1257 1258# Things we need to do before we recursively start building the kernel 1259# or the modules are listed in "prepare". 1260# A multi level approach is used. prepareN is processed before prepareN-1. 1261# archprepare is used in arch Makefiles and when processed asm symlink, 1262# version.h and scripts_basic is processed / created. 1263 1264PHONY += prepare archprepare 1265 1266archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1267 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1268 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1269 1270prepare0: archprepare 1271 $(Q)$(MAKE) $(build)=scripts/mod 1272 $(Q)$(MAKE) $(build)=. prepare 1273 1274# All the preparing.. 1275prepare: prepare0 1276ifdef CONFIG_RUST 1277 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1278 $(Q)$(MAKE) $(build)=rust 1279endif 1280 1281PHONY += remove-stale-files 1282remove-stale-files: 1283 $(Q)$(srctree)/scripts/remove-stale-files 1284 1285# Support for using generic headers in asm-generic 1286asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1287 1288PHONY += asm-generic uapi-asm-generic 1289asm-generic: uapi-asm-generic 1290 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1291 generic=include/asm-generic 1292uapi-asm-generic: 1293 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1294 generic=include/uapi/asm-generic 1295 1296# Generate some files 1297# --------------------------------------------------------------------------- 1298 1299# KERNELRELEASE can change from a few different places, meaning version.h 1300# needs to be updated, so this check is forced on all builds 1301 1302uts_len := 64 1303define filechk_utsrelease.h 1304 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1305 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1306 exit 1; \ 1307 fi; \ 1308 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1309endef 1310 1311define filechk_version.h 1312 if [ $(SUBLEVEL) -gt 255 ]; then \ 1313 echo \#define LINUX_VERSION_CODE $(shell \ 1314 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1315 else \ 1316 echo \#define LINUX_VERSION_CODE $(shell \ 1317 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1318 fi; \ 1319 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1320 ((c) > 255 ? 255 : (c)))'; \ 1321 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1322 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1323 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1324endef 1325 1326$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1327$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1328$(version_h): FORCE 1329 $(call filechk,version.h) 1330 1331include/generated/utsrelease.h: include/config/kernel.release FORCE 1332 $(call filechk,utsrelease.h) 1333 1334filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1335 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1336 1337include/generated/compile.h: FORCE 1338 $(call filechk,compile.h) 1339 1340PHONY += headerdep 1341headerdep: 1342 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1343 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1344 1345# --------------------------------------------------------------------------- 1346# Kernel headers 1347 1348#Default location for installed headers 1349export INSTALL_HDR_PATH = $(objtree)/usr 1350 1351quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1352 cmd_headers_install = \ 1353 mkdir -p $(INSTALL_HDR_PATH); \ 1354 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1355 usr/include $(INSTALL_HDR_PATH) 1356 1357PHONY += headers_install 1358headers_install: headers 1359 $(call cmd,headers_install) 1360 1361PHONY += archheaders archscripts 1362 1363hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1364 1365PHONY += headers 1366headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1367 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1368 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1369 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1370 1371ifdef CONFIG_HEADERS_INSTALL 1372prepare: headers 1373endif 1374 1375PHONY += scripts_unifdef 1376scripts_unifdef: scripts_basic 1377 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1378 1379# --------------------------------------------------------------------------- 1380# Install 1381 1382# Many distributions have the custom install script, /sbin/installkernel. 1383# If DKMS is installed, 'make install' will eventually recurse back 1384# to this Makefile to build and install external modules. 1385# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1386 1387quiet_cmd_install = INSTALL $(INSTALL_PATH) 1388 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1389 1390# --------------------------------------------------------------------------- 1391# Tools 1392 1393ifdef CONFIG_OBJTOOL 1394prepare: tools/objtool 1395endif 1396 1397ifdef CONFIG_BPF 1398ifdef CONFIG_DEBUG_INFO_BTF 1399prepare: tools/bpf/resolve_btfids 1400endif 1401endif 1402 1403PHONY += resolve_btfids_clean 1404 1405resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1406 1407# tools/bpf/resolve_btfids directory might not exist 1408# in output directory, skip its clean in that case 1409resolve_btfids_clean: 1410ifneq ($(wildcard $(resolve_btfids_O)),) 1411 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1412endif 1413 1414# Clear a bunch of variables before executing the submake 1415ifeq ($(quiet),silent_) 1416tools_silent=s 1417endif 1418 1419tools/: FORCE 1420 $(Q)mkdir -p $(objtree)/tools 1421 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1422 1423tools/%: FORCE 1424 $(Q)mkdir -p $(objtree)/tools 1425 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1426 1427# --------------------------------------------------------------------------- 1428# Kernel selftest 1429 1430PHONY += kselftest 1431kselftest: headers 1432 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1433 1434kselftest-%: headers FORCE 1435 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1436 1437PHONY += kselftest-merge 1438kselftest-merge: 1439 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1440 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1441 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1442 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1443 1444# --------------------------------------------------------------------------- 1445# Devicetree files 1446 1447ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1448dtstree := arch/$(SRCARCH)/boot/dts 1449endif 1450 1451ifneq ($(dtstree),) 1452 1453%.dtb: dtbs_prepare 1454 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1455 1456%.dtbo: dtbs_prepare 1457 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1458 1459PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1460dtbs: dtbs_prepare 1461 $(Q)$(MAKE) $(build)=$(dtstree) 1462 1463# include/config/kernel.release is actually needed when installing DTBs because 1464# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1465# dtbs_install depend on it as dtbs_install may run as root. 1466dtbs_prepare: include/config/kernel.release scripts_dtc 1467 1468ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1469export CHECK_DTBS=y 1470dtbs: dt_binding_check 1471endif 1472 1473dtbs_check: dtbs 1474 1475dtbs_install: 1476 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1477 1478ifdef CONFIG_OF_EARLY_FLATTREE 1479all: dtbs 1480endif 1481 1482endif 1483 1484PHONY += scripts_dtc 1485scripts_dtc: scripts_basic 1486 $(Q)$(MAKE) $(build)=scripts/dtc 1487 1488ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1489export CHECK_DT_BINDING=y 1490endif 1491 1492PHONY += dt_binding_check 1493dt_binding_check: scripts_dtc 1494 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1495 1496PHONY += dt_compatible_check 1497dt_compatible_check: dt_binding_check 1498 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1499 1500# --------------------------------------------------------------------------- 1501# Modules 1502 1503ifdef CONFIG_MODULES 1504 1505# By default, build modules as well 1506 1507all: modules 1508 1509# When we're building modules with modversions, we need to consider 1510# the built-in objects during the descend as well, in order to 1511# make sure the checksums are up to date before we record them. 1512ifdef CONFIG_MODVERSIONS 1513 KBUILD_BUILTIN := 1 1514endif 1515 1516# Build modules 1517# 1518 1519# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES 1520# is an exception. 1521ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1522modules: vmlinux 1523endif 1524 1525modules: modules_prepare 1526 1527# Target to prepare building external modules 1528modules_prepare: prepare 1529 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1530 1531export modules_sign_only := 1532 1533ifeq ($(CONFIG_MODULE_SIG),y) 1534PHONY += modules_sign 1535modules_sign: modules_install 1536 @: 1537 1538# modules_sign is a subset of modules_install. 1539# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1540ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1541modules_sign_only := y 1542endif 1543endif 1544 1545modinst_pre := 1546ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1547modinst_pre := __modinst_pre 1548endif 1549 1550modules_install: $(modinst_pre) 1551PHONY += __modinst_pre 1552__modinst_pre: 1553 @rm -rf $(MODLIB)/kernel 1554 @rm -f $(MODLIB)/source 1555 @mkdir -p $(MODLIB)/kernel 1556 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1557 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1558 rm -f $(MODLIB)/build ; \ 1559 ln -s $(CURDIR) $(MODLIB)/build ; \ 1560 fi 1561 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1562 @cp -f modules.builtin $(MODLIB)/ 1563 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1564 1565endif # CONFIG_MODULES 1566 1567### 1568# Cleaning is done on three levels. 1569# make clean Delete most generated files 1570# Leave enough to build external modules 1571# make mrproper Delete the current configuration, and all generated files 1572# make distclean Remove editor backup files, patch leftover files and the like 1573 1574# Directories & files removed with 'make clean' 1575CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1576 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1577 compile_commands.json .thinlto-cache rust/test rust/doc \ 1578 .vmlinux.objs .vmlinux.export.c 1579 1580# Directories & files removed with 'make mrproper' 1581MRPROPER_FILES += include/config include/generated \ 1582 arch/$(SRCARCH)/include/generated .objdiff \ 1583 debian snap tar-install \ 1584 .config .config.old .version \ 1585 Module.symvers \ 1586 certs/signing_key.pem \ 1587 certs/x509.genkey \ 1588 vmlinux-gdb.py \ 1589 *.spec \ 1590 rust/target.json rust/libmacros.so 1591 1592# clean - Delete most, but leave enough to build external modules 1593# 1594clean: rm-files := $(CLEAN_FILES) 1595 1596PHONY += archclean vmlinuxclean 1597 1598vmlinuxclean: 1599 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1600 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1601 1602clean: archclean vmlinuxclean resolve_btfids_clean 1603 1604# mrproper - Delete all generated files, including .config 1605# 1606mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1607mrproper-dirs := $(addprefix _mrproper_,scripts) 1608 1609PHONY += $(mrproper-dirs) mrproper 1610$(mrproper-dirs): 1611 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1612 1613mrproper: clean $(mrproper-dirs) 1614 $(call cmd,rmfiles) 1615 @find . $(RCS_FIND_IGNORE) \ 1616 \( -name '*.rmeta' \) \ 1617 -type f -print | xargs rm -f 1618 1619# distclean 1620# 1621PHONY += distclean 1622 1623distclean: mrproper 1624 @find . $(RCS_FIND_IGNORE) \ 1625 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1626 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1627 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1628 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1629 -type f -print | xargs rm -f 1630 1631 1632# Packaging of the kernel to various formats 1633# --------------------------------------------------------------------------- 1634 1635%src-pkg: FORCE 1636 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1637%pkg: include/config/kernel.release FORCE 1638 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1639 1640# Brief documentation of the typical targets used 1641# --------------------------------------------------------------------------- 1642 1643boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1644boards := $(sort $(notdir $(boards))) 1645board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1646board-dirs := $(sort $(notdir $(board-dirs:/=))) 1647 1648PHONY += help 1649help: 1650 @echo 'Cleaning targets:' 1651 @echo ' clean - Remove most generated files but keep the config and' 1652 @echo ' enough build support to build external modules' 1653 @echo ' mrproper - Remove all generated files + config + various backup files' 1654 @echo ' distclean - mrproper + remove editor backup and patch files' 1655 @echo '' 1656 @echo 'Configuration targets:' 1657 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1658 @echo '' 1659 @echo 'Other generic targets:' 1660 @echo ' all - Build all targets marked with [*]' 1661 @echo '* vmlinux - Build the bare kernel' 1662 @echo '* modules - Build all modules' 1663 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1664 @echo ' dir/ - Build all files in dir and below' 1665 @echo ' dir/file.[ois] - Build specified target only' 1666 @echo ' dir/file.ll - Build the LLVM assembly file' 1667 @echo ' (requires compiler support for LLVM assembly generation)' 1668 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1669 @echo ' (requires a recent binutils and recent build (System.map))' 1670 @echo ' dir/file.ko - Build module including final link' 1671 @echo ' modules_prepare - Set up for building external modules' 1672 @echo ' tags/TAGS - Generate tags file for editors' 1673 @echo ' cscope - Generate cscope index' 1674 @echo ' gtags - Generate GNU GLOBAL index' 1675 @echo ' kernelrelease - Output the release version string (use with make -s)' 1676 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1677 @echo ' image_name - Output the image name (use with make -s)' 1678 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1679 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1680 echo '' 1681 @echo 'Static analysers:' 1682 @echo ' checkstack - Generate a list of stack hogs' 1683 @echo ' versioncheck - Sanity check on version.h usage' 1684 @echo ' includecheck - Check for duplicate included header files' 1685 @echo ' export_report - List the usages of all exported symbols' 1686 @echo ' headerdep - Detect inclusion cycles in headers' 1687 @echo ' coccicheck - Check with Coccinelle' 1688 @echo ' clang-analyzer - Check with clang static analyzer' 1689 @echo ' clang-tidy - Check with clang-tidy' 1690 @echo '' 1691 @echo 'Tools:' 1692 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1693 @echo '' 1694 @echo 'Kernel selftest:' 1695 @echo ' kselftest - Build and run kernel selftest' 1696 @echo ' Build, install, and boot kernel before' 1697 @echo ' running kselftest on it' 1698 @echo ' Run as root for full coverage' 1699 @echo ' kselftest-all - Build kernel selftest' 1700 @echo ' kselftest-install - Build and install kernel selftest' 1701 @echo ' kselftest-clean - Remove all generated kselftest files' 1702 @echo ' kselftest-merge - Merge all the config dependencies of' 1703 @echo ' kselftest to existing .config.' 1704 @echo '' 1705 @echo 'Rust targets:' 1706 @echo ' rustavailable - Checks whether the Rust toolchain is' 1707 @echo ' available and, if not, explains why.' 1708 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1709 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1710 @echo ' is formatted, printing a diff otherwise.' 1711 @echo ' rustdoc - Generate Rust documentation' 1712 @echo ' (requires kernel .config)' 1713 @echo ' rusttest - Runs the Rust tests' 1714 @echo ' (requires kernel .config; downloads external repos)' 1715 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1716 @echo ' (requires kernel .config)' 1717 @echo ' dir/file.[os] - Build specified target only' 1718 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1719 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1720 @echo ' The output is not intended to be compilable.' 1721 @echo ' dir/file.ll - Build the LLVM assembly file' 1722 @echo '' 1723 @$(if $(dtstree), \ 1724 echo 'Devicetree:'; \ 1725 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1726 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1727 echo ' dt_binding_check - Validate device tree binding documents'; \ 1728 echo ' dtbs_check - Validate device tree source files';\ 1729 echo '') 1730 1731 @echo 'Userspace tools targets:' 1732 @echo ' use "make tools/help"' 1733 @echo ' or "cd tools; make help"' 1734 @echo '' 1735 @echo 'Kernel packaging:' 1736 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1737 @echo '' 1738 @echo 'Documentation targets:' 1739 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1740 @echo '' 1741 @echo 'Architecture specific targets ($(SRCARCH)):' 1742 @$(or $(archhelp),\ 1743 echo ' No architecture specific help defined for $(SRCARCH)') 1744 @echo '' 1745 @$(if $(boards), \ 1746 $(foreach b, $(boards), \ 1747 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1748 echo '') 1749 @$(if $(board-dirs), \ 1750 $(foreach b, $(board-dirs), \ 1751 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1752 printf " %-16s - Show all of the above\\n" help-boards; \ 1753 echo '') 1754 1755 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1756 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1757 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1758 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1759 @echo ' (sparse by default)' 1760 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1761 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1762 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1763 @echo ' 1: warnings which may be relevant and do not occur too often' 1764 @echo ' 2: warnings which occur quite often but may still be relevant' 1765 @echo ' 3: more obscure warnings, can most likely be ignored' 1766 @echo ' e: warnings are being treated as errors' 1767 @echo ' Multiple levels can be combined with W=12 or W=123' 1768 @echo '' 1769 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1770 @echo 'For further info see the ./README file' 1771 1772 1773help-board-dirs := $(addprefix help-,$(board-dirs)) 1774 1775help-boards: $(help-board-dirs) 1776 1777boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1778 1779$(help-board-dirs): help-%: 1780 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1781 @$(if $(boards-per-dir), \ 1782 $(foreach b, $(boards-per-dir), \ 1783 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1784 echo '') 1785 1786 1787# Documentation targets 1788# --------------------------------------------------------------------------- 1789DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1790 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1791PHONY += $(DOC_TARGETS) 1792$(DOC_TARGETS): 1793 $(Q)$(MAKE) $(build)=Documentation $@ 1794 1795 1796# Rust targets 1797# --------------------------------------------------------------------------- 1798 1799# "Is Rust available?" target 1800PHONY += rustavailable 1801rustavailable: 1802 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1803 1804# Documentation target 1805# 1806# Using the singular to avoid running afoul of `no-dot-config-targets`. 1807PHONY += rustdoc 1808rustdoc: prepare 1809 $(Q)$(MAKE) $(build)=rust $@ 1810 1811# Testing target 1812PHONY += rusttest 1813rusttest: prepare 1814 $(Q)$(MAKE) $(build)=rust $@ 1815 1816# Formatting targets 1817PHONY += rustfmt rustfmtcheck 1818 1819# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1820# 1821# We match using absolute paths since `find` does not resolve them 1822# when matching, which is a problem when e.g. `srctree` is `..`. 1823# We `grep` afterwards in order to remove the directory entry itself. 1824rustfmt: 1825 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1826 -o -path $(abs_srctree)/rust/alloc -prune \ 1827 -o -path $(abs_objtree)/rust/test -prune \ 1828 | grep -Fv $(abs_srctree)/rust/alloc \ 1829 | grep -Fv $(abs_objtree)/rust/test \ 1830 | grep -Fv generated \ 1831 | xargs $(RUSTFMT) $(rustfmt_flags) 1832 1833rustfmtcheck: rustfmt_flags = --check 1834rustfmtcheck: rustfmt 1835 1836# IDE support targets 1837PHONY += rust-analyzer 1838rust-analyzer: 1839 $(Q)$(MAKE) $(build)=rust $@ 1840 1841# Misc 1842# --------------------------------------------------------------------------- 1843 1844PHONY += scripts_gdb 1845scripts_gdb: prepare0 1846 $(Q)$(MAKE) $(build)=scripts/gdb 1847 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1848 1849ifdef CONFIG_GDB_SCRIPTS 1850all: scripts_gdb 1851endif 1852 1853else # KBUILD_EXTMOD 1854 1855### 1856# External module support. 1857# When building external modules the kernel used as basis is considered 1858# read-only, and no consistency checks are made and the make 1859# system is not used on the basis kernel. If updates are required 1860# in the basis kernel ordinary make commands (without M=...) must be used. 1861 1862# We are always building only modules. 1863KBUILD_BUILTIN := 1864KBUILD_MODULES := 1 1865 1866build-dir := $(KBUILD_EXTMOD) 1867 1868compile_commands.json: $(extmod_prefix)compile_commands.json 1869PHONY += compile_commands.json 1870 1871clean-dirs := $(KBUILD_EXTMOD) 1872clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1873 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1874 1875PHONY += prepare 1876# now expand this into a simple variable to reduce the cost of shell evaluations 1877prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1878prepare: 1879 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1880 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1881 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1882 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1883 fi 1884 1885PHONY += help 1886help: 1887 @echo ' Building external modules.' 1888 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1889 @echo '' 1890 @echo ' modules - default target, build the module(s)' 1891 @echo ' modules_install - install the module' 1892 @echo ' clean - remove generated files in module directory only' 1893 @echo '' 1894 1895endif # KBUILD_EXTMOD 1896 1897# --------------------------------------------------------------------------- 1898# Modules 1899 1900PHONY += modules modules_install modules_prepare 1901 1902ifdef CONFIG_MODULES 1903 1904$(MODORDER): $(build-dir) 1905 @: 1906 1907# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1908# This is solely useful to speed up test compiles. 1909modules: modpost 1910ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1911 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1912endif 1913 1914PHONY += modules_check 1915modules_check: $(MODORDER) 1916 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1917 1918quiet_cmd_depmod = DEPMOD $(MODLIB) 1919 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1920 $(KERNELRELEASE) 1921 1922modules_install: 1923 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1924 $(call cmd,depmod) 1925 1926else # CONFIG_MODULES 1927 1928# Modules not configured 1929# --------------------------------------------------------------------------- 1930 1931modules modules_install: 1932 @echo >&2 '***' 1933 @echo >&2 '*** The present kernel configuration has modules disabled.' 1934 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1935 @echo >&2 '*** to enable CONFIG_MODULES.' 1936 @echo >&2 '***' 1937 @exit 1 1938 1939KBUILD_MODULES := 1940 1941endif # CONFIG_MODULES 1942 1943PHONY += modpost 1944modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1945 $(if $(KBUILD_MODULES), modules_check) 1946 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1947 1948# Single targets 1949# --------------------------------------------------------------------------- 1950# To build individual files in subdirectories, you can do like this: 1951# 1952# make foo/bar/baz.s 1953# 1954# The supported suffixes for single-target are listed in 'single-targets' 1955# 1956# To build only under specific subdirectories, you can do like this: 1957# 1958# make foo/bar/baz/ 1959 1960ifdef single-build 1961 1962# .ko is special because modpost is needed 1963single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1964single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1965 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1966 1967$(single-ko): single_modules 1968 @: 1969$(single-no-ko): $(build-dir) 1970 @: 1971 1972# Remove MODORDER when done because it is not the real one. 1973PHONY += single_modules 1974single_modules: $(single-no-ko) modules_prepare 1975 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1976 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1977ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1978 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1979endif 1980 $(Q)rm -f $(MODORDER) 1981 1982single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1983 1984KBUILD_MODULES := 1 1985 1986endif 1987 1988# Preset locale variables to speed up the build process. Limit locale 1989# tweaks to this spot to avoid wrong language settings when running 1990# make menuconfig etc. 1991# Error messages still appears in the original language 1992PHONY += $(build-dir) 1993$(build-dir): prepare 1994 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1995 1996clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1997PHONY += $(clean-dirs) clean 1998$(clean-dirs): 1999 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2000 2001clean: $(clean-dirs) 2002 $(call cmd,rmfiles) 2003 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2004 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2005 -o -name '*.ko.*' \ 2006 -o -name '*.dtb' -o -name '*.dtbo' \ 2007 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2008 -o -name '*.dt.yaml' \ 2009 -o -name '*.dwo' -o -name '*.lst' \ 2010 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 2011 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2012 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2013 -o -name '*.asn1.[ch]' \ 2014 -o -name '*.symtypes' -o -name 'modules.order' \ 2015 -o -name '.tmp_*' \ 2016 -o -name '*.c.[012]*.*' \ 2017 -o -name '*.ll' \ 2018 -o -name '*.gcno' \ 2019 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 2020 2021# Generate tags for editors 2022# --------------------------------------------------------------------------- 2023quiet_cmd_tags = GEN $@ 2024 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2025 2026tags TAGS cscope gtags: FORCE 2027 $(call cmd,tags) 2028 2029# Script to generate missing namespace dependencies 2030# --------------------------------------------------------------------------- 2031 2032PHONY += nsdeps 2033nsdeps: export KBUILD_NSDEPS=1 2034nsdeps: modules 2035 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2036 2037# Clang Tooling 2038# --------------------------------------------------------------------------- 2039 2040quiet_cmd_gen_compile_commands = GEN $@ 2041 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2042 2043$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2044 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2045 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2046 $(call if_changed,gen_compile_commands) 2047 2048targets += $(extmod_prefix)compile_commands.json 2049 2050PHONY += clang-tidy clang-analyzer 2051 2052ifdef CONFIG_CC_IS_CLANG 2053quiet_cmd_clang_tools = CHECK $< 2054 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2055 2056clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2057 $(call cmd,clang_tools) 2058else 2059clang-tidy clang-analyzer: 2060 @echo "$@ requires CC=clang" >&2 2061 @false 2062endif 2063 2064# Scripts to check various things for consistency 2065# --------------------------------------------------------------------------- 2066 2067PHONY += includecheck versioncheck coccicheck export_report 2068 2069includecheck: 2070 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2071 -name '*.[hcS]' -type f -print | sort \ 2072 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2073 2074versioncheck: 2075 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2076 -name '*.[hcS]' -type f -print | sort \ 2077 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2078 2079coccicheck: 2080 $(Q)$(BASH) $(srctree)/scripts/$@ 2081 2082export_report: 2083 $(PERL) $(srctree)/scripts/export_report.pl 2084 2085PHONY += checkstack kernelrelease kernelversion image_name 2086 2087# UML needs a little special treatment here. It wants to use the host 2088# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2089# else wants $(ARCH), including people doing cross-builds, which means 2090# that $(SUBARCH) doesn't work here. 2091ifeq ($(ARCH), um) 2092CHECKSTACK_ARCH := $(SUBARCH) 2093else 2094CHECKSTACK_ARCH := $(ARCH) 2095endif 2096checkstack: 2097 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2098 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2099 2100kernelrelease: 2101 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 2102 2103kernelversion: 2104 @echo $(KERNELVERSION) 2105 2106image_name: 2107 @echo $(KBUILD_IMAGE) 2108 2109quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2110 cmd_rmfiles = rm -rf $(rm-files) 2111 2112# read saved command lines for existing targets 2113existing-targets := $(wildcard $(sort $(targets))) 2114 2115-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2116 2117endif # config-build 2118endif # mixed-build 2119endif # need-sub-make 2120 2121PHONY += FORCE 2122FORCE: 2123 2124# Declare the contents of the PHONY variable as phony. We keep that 2125# information in a variable so we can use it in if_changed and friends. 2126.PHONY: $(PHONY) 2127