1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 14 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 6NAME = Opossums on Parade 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 = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132# Remove trailing slashes 133ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135endif 136 137export KBUILD_EXTMOD 138 139# Kbuild will save output files in the current working directory. 140# This does not need to match to the root of the kernel source tree. 141# 142# For example, you can do this: 143# 144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145# 146# If you want to save output files in a different location, there are 147# two syntaxes to specify it. 148# 149# 1) O= 150# Use "make O=dir/to/store/output/files/" 151# 152# 2) Set KBUILD_OUTPUT 153# Set the environment variable KBUILD_OUTPUT to point to the output directory. 154# export KBUILD_OUTPUT=dir/to/store/output/files/; make 155# 156# The O= assignment takes precedence over the KBUILD_OUTPUT environment 157# variable. 158 159# Do we want to change the working directory? 160ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162endif 163 164ifneq ($(KBUILD_OUTPUT),) 165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166# expand a shell special character '~'. We use a somewhat tedious way here. 167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168$(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171# $(realpath ...) resolves symlinks 172abs_objtree := $(realpath $(abs_objtree)) 173else 174abs_objtree := $(CURDIR) 175endif # ifneq ($(KBUILD_OUTPUT),) 176 177ifeq ($(abs_objtree),$(CURDIR)) 178# Suppress "Entering directory ..." unless we are changing the work directory. 179MAKEFLAGS += --no-print-directory 180else 181need-sub-make := 1 182endif 183 184this-makefile := $(lastword $(MAKEFILE_LIST)) 185abs_srctree := $(realpath $(dir $(this-makefile))) 186 187ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188$(error source directory cannot contain spaces or colons) 189endif 190 191ifneq ($(abs_srctree),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# --included-dir is added for backward compatibility, but you should not rely on 195# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197endif 198 199ifneq ($(filter 3.%,$(MAKE_VERSION)),) 200# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 201# We need to invoke sub-make to avoid implicit rules in the top Makefile. 202need-sub-make := 1 203# Cancel implicit rules for this Makefile. 204$(this-makefile): ; 205endif 206 207export abs_srctree abs_objtree 208export sub_make_done := 1 209 210ifeq ($(need-sub-make),1) 211 212PHONY += $(MAKECMDGOALS) __sub-make 213 214$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 215 @: 216 217# Invoke a second make in the output directory, passing relevant variables 218__sub-make: 219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 220 221endif # need-sub-make 222endif # sub_make_done 223 224# We process the rest of the Makefile if this is the final invocation of make 225ifeq ($(need-sub-make),) 226 227# Do not print "Entering directory ...", 228# but we want to display it when entering to the output directory 229# so that IDEs/editors are able to understand relative filenames. 230MAKEFLAGS += --no-print-directory 231 232ifeq ($(abs_srctree),$(abs_objtree)) 233 # building in the source tree 234 srctree := . 235 building_out_of_srctree := 236else 237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 238 # building in a subdirectory of the source tree 239 srctree := .. 240 else 241 srctree := $(abs_srctree) 242 endif 243 building_out_of_srctree := 1 244endif 245 246ifneq ($(KBUILD_ABS_SRCTREE),) 247srctree := $(abs_srctree) 248endif 249 250objtree := . 251VPATH := $(srctree) 252 253export building_out_of_srctree srctree objtree VPATH 254 255# To make sure we do not include .config for any of the *config targets 256# catch them early, and hand them over to scripts/kconfig/Makefile 257# It is allowed to specify more targets when calling make, including 258# mixing *config targets and build targets. 259# For example 'make oldconfig all'. 260# Detect when mixed targets is specified, and make a second invocation 261# of make so .config is not included in this case either (for *config). 262 263version_h := include/generated/uapi/linux/version.h 264 265clean-targets := %clean mrproper cleandocs 266no-dot-config-targets := $(clean-targets) \ 267 cscope gtags TAGS tags help% %docs check% coccicheck \ 268 $(version_h) headers headers_% archheaders archscripts \ 269 %asm-generic kernelversion %src-pkg dt_binding_check \ 270 outputmakefile 271# Installation targets should not require compiler. Unfortunately, vdso_install 272# is an exception where build artifacts may be updated. This must be fixed. 273no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 274 headers_install modules_install kernelrelease image_name 275no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 276 image_name 277single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 278 279config-build := 280mixed-build := 281need-config := 1 282need-compiler := 1 283may-sync-config := 1 284single-build := 285 286ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 need-config := 289 endif 290endif 291 292ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 294 need-compiler := 295 endif 296endif 297 298ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 may-sync-config := 301 endif 302endif 303 304ifneq ($(KBUILD_EXTMOD),) 305 may-sync-config := 306endif 307 308ifeq ($(KBUILD_EXTMOD),) 309 ifneq ($(filter %config,$(MAKECMDGOALS)),) 310 config-build := 1 311 ifneq ($(words $(MAKECMDGOALS)),1) 312 mixed-build := 1 313 endif 314 endif 315endif 316 317# We cannot build single targets and the others at the same time 318ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 319 single-build := 1 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325# For "make -j clean all", "make -j mrproper defconfig all", etc. 326ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# install and modules_install need also be processed one by one 333ifneq ($(filter install,$(MAKECMDGOALS)),) 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339ifdef mixed-build 340# =========================================================================== 341# We're called with mixed targets (*config and build targets). 342# Handle them one by one. 343 344PHONY += $(MAKECMDGOALS) __build_one_by_one 345 346$(MAKECMDGOALS): __build_one_by_one 347 @: 348 349__build_one_by_one: 350 $(Q)set -e; \ 351 for i in $(MAKECMDGOALS); do \ 352 $(MAKE) -f $(srctree)/Makefile $$i; \ 353 done 354 355else # !mixed-build 356 357include $(srctree)/scripts/Kbuild.include 358 359# Read KERNELRELEASE from include/config/kernel.release (if it exists) 360KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 361KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 363 364include $(srctree)/scripts/subarch.include 365 366# Cross compiling and selecting different set of gcc/bin-utils 367# --------------------------------------------------------------------------- 368# 369# When performing cross compilation for other architectures ARCH shall be set 370# to the target architecture. (See arch/* for the possibilities). 371# ARCH can be set during invocation of make: 372# make ARCH=ia64 373# Another way is to have ARCH set in the environment. 374# The default ARCH is the host where make is executed. 375 376# CROSS_COMPILE specify the prefix used for all executables used 377# during compilation. Only gcc and related bin-utils executables 378# are prefixed with $(CROSS_COMPILE). 379# CROSS_COMPILE can be set on the command line 380# make CROSS_COMPILE=ia64-linux- 381# Alternatively CROSS_COMPILE can be set in the environment. 382# Default value for CROSS_COMPILE is not to prefix executables 383# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 384ARCH ?= $(SUBARCH) 385 386# Architecture as present in compile.h 387UTS_MACHINE := $(ARCH) 388SRCARCH := $(ARCH) 389 390# Additional ARCH settings for x86 391ifeq ($(ARCH),i386) 392 SRCARCH := x86 393endif 394ifeq ($(ARCH),x86_64) 395 SRCARCH := x86 396endif 397 398# Additional ARCH settings for sparc 399ifeq ($(ARCH),sparc32) 400 SRCARCH := sparc 401endif 402ifeq ($(ARCH),sparc64) 403 SRCARCH := sparc 404endif 405 406export cross_compiling := 407ifneq ($(SRCARCH),$(SUBARCH)) 408cross_compiling := 1 409endif 410 411KCONFIG_CONFIG ?= .config 412export KCONFIG_CONFIG 413 414# SHELL used by kbuild 415CONFIG_SHELL := sh 416 417HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 418HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 419HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 420 421ifneq ($(LLVM),) 422HOSTCC = clang 423HOSTCXX = clang++ 424else 425HOSTCC = gcc 426HOSTCXX = g++ 427endif 428 429export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 430 -O2 -fomit-frame-pointer -std=gnu89 431export KBUILD_USERLDFLAGS := 432 433KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 434KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 435KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 436KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 437 438# Make variables (CC, etc...) 439CPP = $(CC) -E 440ifneq ($(LLVM),) 441CC = clang 442LD = ld.lld 443AR = llvm-ar 444NM = llvm-nm 445OBJCOPY = llvm-objcopy 446OBJDUMP = llvm-objdump 447READELF = llvm-readelf 448STRIP = llvm-strip 449else 450CC = $(CROSS_COMPILE)gcc 451LD = $(CROSS_COMPILE)ld 452AR = $(CROSS_COMPILE)ar 453NM = $(CROSS_COMPILE)nm 454OBJCOPY = $(CROSS_COMPILE)objcopy 455OBJDUMP = $(CROSS_COMPILE)objdump 456READELF = $(CROSS_COMPILE)readelf 457STRIP = $(CROSS_COMPILE)strip 458endif 459PAHOLE = pahole 460RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 461LEX = flex 462YACC = bison 463AWK = awk 464INSTALLKERNEL := installkernel 465DEPMOD = depmod 466PERL = perl 467PYTHON3 = python3 468CHECK = sparse 469BASH = bash 470KGZIP = gzip 471KBZIP2 = bzip2 472KLZOP = lzop 473LZMA = lzma 474LZ4 = lz4c 475XZ = xz 476ZSTD = zstd 477 478CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 479 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 480NOSTDINC_FLAGS := 481CFLAGS_MODULE = 482AFLAGS_MODULE = 483LDFLAGS_MODULE = 484CFLAGS_KERNEL = 485AFLAGS_KERNEL = 486LDFLAGS_vmlinux = 487 488# Use USERINCLUDE when you must reference the UAPI directories only. 489USERINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 492 -I$(srctree)/include/uapi \ 493 -I$(objtree)/include/generated/uapi \ 494 -include $(srctree)/include/linux/compiler-version.h \ 495 -include $(srctree)/include/linux/kconfig.h 496 497# Use LINUXINCLUDE when you must reference the include/ directory. 498# Needed to be compatible with the O= option 499LINUXINCLUDE := \ 500 -I$(srctree)/arch/$(SRCARCH)/include \ 501 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 502 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 503 -I$(objtree)/include \ 504 $(USERINCLUDE) 505 506KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 507KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 508 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 509 -Werror=implicit-function-declaration -Werror=implicit-int \ 510 -Werror=return-type -Wno-format-security \ 511 -std=gnu89 512KBUILD_CPPFLAGS := -D__KERNEL__ 513KBUILD_AFLAGS_KERNEL := 514KBUILD_CFLAGS_KERNEL := 515KBUILD_AFLAGS_MODULE := -DMODULE 516KBUILD_CFLAGS_MODULE := -DMODULE 517KBUILD_LDFLAGS_MODULE := 518KBUILD_LDFLAGS := 519CLANG_FLAGS := 520 521export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 522export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 523export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 524export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 525export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 526 527export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 528export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 529export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 530export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 531export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 532 533# Files to ignore in find ... statements 534 535export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 536 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 537 -prune -o 538export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 539 --exclude CVS --exclude .pc --exclude .hg --exclude .git 540 541# =========================================================================== 542# Rules shared between *config targets and build targets 543 544# Basic helpers built in scripts/basic/ 545PHONY += scripts_basic 546scripts_basic: 547 $(Q)$(MAKE) $(build)=scripts/basic 548 549PHONY += outputmakefile 550ifdef building_out_of_srctree 551# Before starting out-of-tree build, make sure the source tree is clean. 552# outputmakefile generates a Makefile in the output directory, if using a 553# separate output directory. This allows convenient use of make in the 554# output directory. 555# At the same time when output Makefile generated, generate .gitignore to 556# ignore whole output directory 557 558quiet_cmd_makefile = GEN Makefile 559 cmd_makefile = { \ 560 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 561 echo "include $(srctree)/Makefile"; \ 562 } > Makefile 563 564outputmakefile: 565 $(Q)if [ -f $(srctree)/.config -o \ 566 -d $(srctree)/include/config -o \ 567 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 568 echo >&2 "***"; \ 569 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 570 echo >&2 "*** in $(abs_srctree)";\ 571 echo >&2 "***"; \ 572 false; \ 573 fi 574 $(Q)ln -fsn $(srctree) source 575 $(call cmd,makefile) 576 $(Q)test -e .gitignore || \ 577 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 578endif 579 580# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 581# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 582# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 583# and from include/config/auto.conf.cmd to detect the compiler upgrade. 584CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 585 586ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 587include $(srctree)/scripts/Makefile.clang 588endif 589 590# Include this also for config targets because some architectures need 591# cc-cross-prefix to determine CROSS_COMPILE. 592ifdef need-compiler 593include $(srctree)/scripts/Makefile.compiler 594endif 595 596ifdef config-build 597# =========================================================================== 598# *config targets only - make sure prerequisites are updated, and descend 599# in scripts/kconfig to make the *config target 600 601# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 602# KBUILD_DEFCONFIG may point out an alternative default configuration 603# used for 'make defconfig' 604include $(srctree)/arch/$(SRCARCH)/Makefile 605export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 606 607config: outputmakefile scripts_basic FORCE 608 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 609 610%config: outputmakefile scripts_basic FORCE 611 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 612 613else #!config-build 614# =========================================================================== 615# Build targets only - this includes vmlinux, arch specific targets, clean 616# targets and others. In general all targets except *config targets. 617 618# If building an external module we do not care about the all: rule 619# but instead __all depend on modules 620PHONY += all 621ifeq ($(KBUILD_EXTMOD),) 622__all: all 623else 624__all: modules 625endif 626 627# Decide whether to build built-in, modular, or both. 628# Normally, just do built-in. 629 630KBUILD_MODULES := 631KBUILD_BUILTIN := 1 632 633# If we have only "make modules", don't compile built-in objects. 634ifeq ($(MAKECMDGOALS),modules) 635 KBUILD_BUILTIN := 636endif 637 638# If we have "make <whatever> modules", compile modules 639# in addition to whatever we do anyway. 640# Just "make" or "make all" shall build modules as well 641 642ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 643 KBUILD_MODULES := 1 644endif 645 646ifeq ($(MAKECMDGOALS),) 647 KBUILD_MODULES := 1 648endif 649 650export KBUILD_MODULES KBUILD_BUILTIN 651 652ifdef need-config 653include include/config/auto.conf 654endif 655 656ifeq ($(KBUILD_EXTMOD),) 657# Objects we will link into vmlinux / subdirs we need to visit 658core-y := init/ usr/ arch/$(SRCARCH)/ 659drivers-y := drivers/ sound/ 660drivers-$(CONFIG_SAMPLES) += samples/ 661drivers-$(CONFIG_NET) += net/ 662drivers-y += virt/ 663libs-y := lib/ 664endif # KBUILD_EXTMOD 665 666# The all: target is the default when no target is given on the 667# command line. 668# This allow a user to issue only 'make' to build a kernel including modules 669# Defaults to vmlinux, but the arch makefile usually adds further targets 670all: vmlinux 671 672CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 673ifdef CONFIG_CC_IS_GCC 674CFLAGS_GCOV += -fno-tree-loop-im 675endif 676export CFLAGS_GCOV 677 678# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 679ifdef CONFIG_FUNCTION_TRACER 680 CC_FLAGS_FTRACE := -pg 681endif 682 683ifdef CONFIG_CC_IS_GCC 684RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 685RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 686endif 687ifdef CONFIG_CC_IS_CLANG 688RETPOLINE_CFLAGS := -mretpoline-external-thunk 689RETPOLINE_VDSO_CFLAGS := -mretpoline 690endif 691export RETPOLINE_CFLAGS 692export RETPOLINE_VDSO_CFLAGS 693 694include $(srctree)/arch/$(SRCARCH)/Makefile 695 696ifdef need-config 697ifdef may-sync-config 698# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 699# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 700# because some architectures define CROSS_COMPILE there. 701include include/config/auto.conf.cmd 702 703$(KCONFIG_CONFIG): 704 @echo >&2 '***' 705 @echo >&2 '*** Configuration file "$@" not found!' 706 @echo >&2 '***' 707 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 708 @echo >&2 '*** "make menuconfig" or "make xconfig").' 709 @echo >&2 '***' 710 @/bin/false 711 712# The actual configuration files used during the build are stored in 713# include/generated/ and include/config/. Update them if .config is newer than 714# include/config/auto.conf (which mirrors .config). 715# 716# This exploits the 'multi-target pattern rule' trick. 717# The syncconfig should be executed only once to make all the targets. 718# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 719# 720# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 721# so you cannot notice that Kconfig is waiting for the user input. 722%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 723 $(Q)$(kecho) " SYNC $@" 724 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 725else # !may-sync-config 726# External modules and some install targets need include/generated/autoconf.h 727# and include/config/auto.conf but do not care if they are up-to-date. 728# Use auto.conf to trigger the test 729PHONY += include/config/auto.conf 730 731include/config/auto.conf: 732 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 733 echo >&2; \ 734 echo >&2 " ERROR: Kernel configuration is invalid."; \ 735 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 736 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 737 echo >&2 ; \ 738 /bin/false) 739 740endif # may-sync-config 741endif # need-config 742 743KBUILD_CFLAGS += -fno-delete-null-pointer-checks 744KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 745KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 746KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 747KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 748 749ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 750KBUILD_CFLAGS += -O2 751else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 752KBUILD_CFLAGS += -O3 753else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 754KBUILD_CFLAGS += -Os 755endif 756 757# Tell gcc to never replace conditional load with a non-conditional one 758ifdef CONFIG_CC_IS_GCC 759# gcc-10 renamed --param=allow-store-data-races=0 to 760# -fno-allow-store-data-races. 761KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 762KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 763endif 764 765ifdef CONFIG_READABLE_ASM 766# Disable optimizations that make assembler listings hard to read. 767# reorder blocks reorders the control in the function 768# ipa clone creates specialized cloned functions 769# partial inlining inlines only parts of functions 770KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 771endif 772 773ifneq ($(CONFIG_FRAME_WARN),0) 774KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 775endif 776 777stackp-flags-y := -fno-stack-protector 778stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 779stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 780 781KBUILD_CFLAGS += $(stackp-flags-y) 782 783ifdef CONFIG_CC_IS_CLANG 784KBUILD_CPPFLAGS += -Qunused-arguments 785# The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable. 786KBUILD_CFLAGS += -Wno-gnu 787# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 788# source of a reference will be _MergedGlobals and not on of the whitelisted names. 789# See modpost pattern 2 790KBUILD_CFLAGS += -mno-global-merge 791else 792 793# Warn about unmarked fall-throughs in switch statement. 794# Disabled for clang while comment to attribute conversion happens and 795# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 796KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,) 797endif 798 799# These warnings generated too much noise in a regular build. 800# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 801KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 802KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 803 804ifdef CONFIG_FRAME_POINTER 805KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 806else 807# Some targets (ARM with Thumb2, for example), can't be built with frame 808# pointers. For those, we don't have FUNCTION_TRACER automatically 809# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 810# incompatible with -fomit-frame-pointer with current GCC, so we don't use 811# -fomit-frame-pointer with FUNCTION_TRACER. 812ifndef CONFIG_FUNCTION_TRACER 813KBUILD_CFLAGS += -fomit-frame-pointer 814endif 815endif 816 817# Initialize all stack variables with a 0xAA pattern. 818ifdef CONFIG_INIT_STACK_ALL_PATTERN 819KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 820endif 821 822# Initialize all stack variables with a zero value. 823ifdef CONFIG_INIT_STACK_ALL_ZERO 824# Future support for zero initialization is still being debated, see 825# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 826# renamed or dropped. 827KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 828KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 829endif 830 831# While VLAs have been removed, GCC produces unreachable stack probes 832# for the randomize_kstack_offset feature. Disable it for all compilers. 833KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 834 835DEBUG_CFLAGS := 836 837# Workaround for GCC versions < 5.0 838# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 839ifdef CONFIG_CC_IS_GCC 840DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 841endif 842 843ifdef CONFIG_DEBUG_INFO 844 845ifdef CONFIG_DEBUG_INFO_SPLIT 846DEBUG_CFLAGS += -gsplit-dwarf 847else 848DEBUG_CFLAGS += -g 849endif 850 851ifndef CONFIG_AS_IS_LLVM 852KBUILD_AFLAGS += -Wa,-gdwarf-2 853endif 854 855ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 856dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 857dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 858DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 859endif 860 861ifdef CONFIG_DEBUG_INFO_REDUCED 862DEBUG_CFLAGS += -fno-var-tracking 863ifdef CONFIG_CC_IS_GCC 864DEBUG_CFLAGS += -femit-struct-debug-baseonly 865endif 866endif 867 868ifdef CONFIG_DEBUG_INFO_COMPRESSED 869DEBUG_CFLAGS += -gz=zlib 870KBUILD_AFLAGS += -gz=zlib 871KBUILD_LDFLAGS += --compress-debug-sections=zlib 872endif 873 874endif # CONFIG_DEBUG_INFO 875 876KBUILD_CFLAGS += $(DEBUG_CFLAGS) 877export DEBUG_CFLAGS 878 879ifdef CONFIG_FUNCTION_TRACER 880ifdef CONFIG_FTRACE_MCOUNT_USE_CC 881 CC_FLAGS_FTRACE += -mrecord-mcount 882 ifdef CONFIG_HAVE_NOP_MCOUNT 883 ifeq ($(call cc-option-yn, -mnop-mcount),y) 884 CC_FLAGS_FTRACE += -mnop-mcount 885 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 886 endif 887 endif 888endif 889ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 890 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 891endif 892ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 893 ifdef CONFIG_HAVE_C_RECORDMCOUNT 894 BUILD_C_RECORDMCOUNT := y 895 export BUILD_C_RECORDMCOUNT 896 endif 897endif 898ifdef CONFIG_HAVE_FENTRY 899 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 900 ifeq ($(call cc-option-yn, -mfentry),y) 901 CC_FLAGS_FTRACE += -mfentry 902 CC_FLAGS_USING += -DCC_USING_FENTRY 903 endif 904endif 905export CC_FLAGS_FTRACE 906KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 907KBUILD_AFLAGS += $(CC_FLAGS_USING) 908endif 909 910# We trigger additional mismatches with less inlining 911ifdef CONFIG_DEBUG_SECTION_MISMATCH 912KBUILD_CFLAGS += -fno-inline-functions-called-once 913endif 914 915ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 916KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 917LDFLAGS_vmlinux += --gc-sections 918endif 919 920ifdef CONFIG_SHADOW_CALL_STACK 921CC_FLAGS_SCS := -fsanitize=shadow-call-stack 922KBUILD_CFLAGS += $(CC_FLAGS_SCS) 923export CC_FLAGS_SCS 924endif 925 926ifdef CONFIG_LTO_CLANG 927ifdef CONFIG_LTO_CLANG_THIN 928CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 929KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 930else 931CC_FLAGS_LTO := -flto 932endif 933CC_FLAGS_LTO += -fvisibility=hidden 934 935# Limit inlining across translation units to reduce binary size 936KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 937 938# Check for frame size exceeding threshold during prolog/epilog insertion 939# when using lld < 13.0.0. 940ifneq ($(CONFIG_FRAME_WARN),0) 941ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 942KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 943endif 944endif 945endif 946 947ifdef CONFIG_LTO 948KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 949KBUILD_AFLAGS += -fno-lto 950export CC_FLAGS_LTO 951endif 952 953ifdef CONFIG_CFI_CLANG 954CC_FLAGS_CFI := -fsanitize=cfi \ 955 -fsanitize-cfi-cross-dso \ 956 -fno-sanitize-cfi-canonical-jump-tables \ 957 -fno-sanitize-trap=cfi \ 958 -fno-sanitize-blacklist 959 960ifdef CONFIG_CFI_PERMISSIVE 961CC_FLAGS_CFI += -fsanitize-recover=cfi 962endif 963 964# If LTO flags are filtered out, we must also filter out CFI. 965CC_FLAGS_LTO += $(CC_FLAGS_CFI) 966KBUILD_CFLAGS += $(CC_FLAGS_CFI) 967export CC_FLAGS_CFI 968endif 969 970ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 971KBUILD_CFLAGS += -falign-functions=64 972endif 973 974# arch Makefile may override CC so keep this after arch Makefile is included 975NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 976 977# warn about C99 declaration after statement 978KBUILD_CFLAGS += -Wdeclaration-after-statement 979 980# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 981KBUILD_CFLAGS += -Wvla 982 983# disable pointer signed / unsigned warnings in gcc 4.0 984KBUILD_CFLAGS += -Wno-pointer-sign 985 986# disable stringop warnings in gcc 8+ 987KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 988 989# We'll want to enable this eventually, but it's not going away for 5.7 at least 990KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 991KBUILD_CFLAGS += -Wno-array-bounds 992KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 993 994# Another good warning that we'll want to enable eventually 995KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 996 997# Enabled with W=2, disabled by default as noisy 998ifdef CONFIG_CC_IS_GCC 999KBUILD_CFLAGS += -Wno-maybe-uninitialized 1000endif 1001 1002# disable invalid "can't wrap" optimizations for signed / pointers 1003KBUILD_CFLAGS += -fno-strict-overflow 1004 1005# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1006KBUILD_CFLAGS += -fno-stack-check 1007 1008# conserve stack if available 1009ifdef CONFIG_CC_IS_GCC 1010KBUILD_CFLAGS += -fconserve-stack 1011endif 1012 1013# Prohibit date/time macros, which would make the build non-deterministic 1014KBUILD_CFLAGS += -Werror=date-time 1015 1016# enforce correct pointer usage 1017KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1018 1019# Require designated initializers for all marked structures 1020KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1021 1022# change __FILE__ to the relative path from the srctree 1023KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1024 1025# include additional Makefiles when needed 1026include-y := scripts/Makefile.extrawarn 1027include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1028include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1029include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1030include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1031include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1032 1033include $(addprefix $(srctree)/, $(include-y)) 1034 1035# scripts/Makefile.gcc-plugins is intentionally included last. 1036# Do not add $(call cc-option,...) below this line. When you build the kernel 1037# from the clean source tree, the GCC plugins do not exist at this point. 1038 1039# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1040KBUILD_CPPFLAGS += $(KCPPFLAGS) 1041KBUILD_AFLAGS += $(KAFLAGS) 1042KBUILD_CFLAGS += $(KCFLAGS) 1043 1044KBUILD_LDFLAGS_MODULE += --build-id=sha1 1045LDFLAGS_vmlinux += --build-id=sha1 1046 1047ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1048LDFLAGS_vmlinux += $(call ld-option, -X,) 1049endif 1050 1051ifeq ($(CONFIG_RELR),y) 1052LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1053endif 1054 1055# We never want expected sections to be placed heuristically by the 1056# linker. All sections should be explicitly named in the linker script. 1057ifdef CONFIG_LD_ORPHAN_WARN 1058LDFLAGS_vmlinux += --orphan-handling=warn 1059endif 1060 1061# Align the bit size of userspace programs with the kernel 1062KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1063KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1064 1065# make the checker run with the right architecture 1066CHECKFLAGS += --arch=$(ARCH) 1067 1068# insure the checker run with the right endianness 1069CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1070 1071# the checker needs the correct machine size 1072CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1073 1074# Default kernel image to build when no specific target is given. 1075# KBUILD_IMAGE may be overruled on the command line or 1076# set in the environment 1077# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1078# this default value 1079export KBUILD_IMAGE ?= vmlinux 1080 1081# 1082# INSTALL_PATH specifies where to place the updated kernel and system map 1083# images. Default is /boot, but you can set it to other values 1084export INSTALL_PATH ?= /boot 1085 1086# 1087# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1088# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1089# an argument if needed. Otherwise it defaults to the kernel install path 1090# 1091export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1092 1093# 1094# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1095# relocations required by build roots. This is not defined in the 1096# makefile but the argument can be passed to make if needed. 1097# 1098 1099MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1100export MODLIB 1101 1102PHONY += prepare0 1103 1104export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1105export MODORDER := $(extmod_prefix)modules.order 1106export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1107 1108ifeq ($(KBUILD_EXTMOD),) 1109core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1110 1111vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1112 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1113 $(libs-y) $(libs-m))) 1114 1115vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1116 $(patsubst %/,%,$(filter %/, $(core-) \ 1117 $(drivers-) $(libs-)))) 1118 1119subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1120 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1121 $(drivers-y) $(drivers-m))) 1122 1123build-dirs := $(vmlinux-dirs) 1124clean-dirs := $(vmlinux-alldirs) 1125 1126# Externally visible symbols (used by link-vmlinux.sh) 1127KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1128KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1129ifdef CONFIG_MODULES 1130KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1131KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1132else 1133KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1134endif 1135KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1136 1137export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1138export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1139# used by scripts/Makefile.package 1140export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1141 1142vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1143 1144# Recurse until adjust_autoksyms.sh is satisfied 1145PHONY += autoksyms_recursive 1146ifdef CONFIG_TRIM_UNUSED_KSYMS 1147# For the kernel to actually contain only the needed exported symbols, 1148# we have to build modules as well to determine what those symbols are. 1149# (this can be evaluated only once include/config/auto.conf has been included) 1150KBUILD_MODULES := 1 1151 1152autoksyms_recursive: descend modules.order 1153 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1154 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1155endif 1156 1157autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1158 1159quiet_cmd_autoksyms_h = GEN $@ 1160 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1161 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1162 1163$(autoksyms_h): 1164 $(call cmd,autoksyms_h) 1165 1166ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1167 1168# Final link of vmlinux with optional arch pass after final link 1169cmd_link-vmlinux = \ 1170 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1171 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1172 1173vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1174 +$(call if_changed_dep,link-vmlinux) 1175 1176targets := vmlinux 1177 1178# The actual objects are generated when descending, 1179# make sure no implicit rule kicks in 1180$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1181 1182filechk_kernel.release = \ 1183 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1184 1185# Store (new) KERNELRELEASE string in include/config/kernel.release 1186include/config/kernel.release: FORCE 1187 $(call filechk,kernel.release) 1188 1189# Additional helpers built in scripts/ 1190# Carefully list dependencies so we do not try to build scripts twice 1191# in parallel 1192PHONY += scripts 1193scripts: scripts_basic scripts_dtc 1194 $(Q)$(MAKE) $(build)=$(@) 1195 1196# Things we need to do before we recursively start building the kernel 1197# or the modules are listed in "prepare". 1198# A multi level approach is used. prepareN is processed before prepareN-1. 1199# archprepare is used in arch Makefiles and when processed asm symlink, 1200# version.h and scripts_basic is processed / created. 1201 1202PHONY += prepare archprepare 1203 1204archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1205 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1206 include/generated/autoconf.h remove-stale-files 1207 1208prepare0: archprepare 1209 $(Q)$(MAKE) $(build)=scripts/mod 1210 $(Q)$(MAKE) $(build)=. 1211 1212# All the preparing.. 1213prepare: prepare0 1214 1215PHONY += remove-stale-files 1216remove-stale-files: 1217 $(Q)$(srctree)/scripts/remove-stale-files 1218 1219# Support for using generic headers in asm-generic 1220asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1221 1222PHONY += asm-generic uapi-asm-generic 1223asm-generic: uapi-asm-generic 1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1225 generic=include/asm-generic 1226uapi-asm-generic: 1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1228 generic=include/uapi/asm-generic 1229 1230# Generate some files 1231# --------------------------------------------------------------------------- 1232 1233# KERNELRELEASE can change from a few different places, meaning version.h 1234# needs to be updated, so this check is forced on all builds 1235 1236uts_len := 64 1237define filechk_utsrelease.h 1238 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1239 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1240 exit 1; \ 1241 fi; \ 1242 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1243endef 1244 1245define filechk_version.h 1246 if [ $(SUBLEVEL) -gt 255 ]; then \ 1247 echo \#define LINUX_VERSION_CODE $(shell \ 1248 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1249 else \ 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1252 fi; \ 1253 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1254 ((c) > 255 ? 255 : (c)))'; \ 1255 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1256 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1257 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1258endef 1259 1260$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1261$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1262$(version_h): FORCE 1263 $(call filechk,version.h) 1264 1265include/generated/utsrelease.h: include/config/kernel.release FORCE 1266 $(call filechk,utsrelease.h) 1267 1268PHONY += headerdep 1269headerdep: 1270 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1271 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1272 1273# --------------------------------------------------------------------------- 1274# Kernel headers 1275 1276#Default location for installed headers 1277export INSTALL_HDR_PATH = $(objtree)/usr 1278 1279quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1280 cmd_headers_install = \ 1281 mkdir -p $(INSTALL_HDR_PATH); \ 1282 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1283 usr/include $(INSTALL_HDR_PATH) 1284 1285PHONY += headers_install 1286headers_install: headers 1287 $(call cmd,headers_install) 1288 1289PHONY += archheaders archscripts 1290 1291hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1292 1293PHONY += headers 1294headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1295 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1296 $(error Headers not exportable for the $(SRCARCH) architecture)) 1297 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1298 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1299 1300# Deprecated. It is no-op now. 1301PHONY += headers_check 1302headers_check: 1303 @echo >&2 "=================== WARNING ===================" 1304 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1305 @echo >&2 "and will be removed after Linux 5.15 release." 1306 @echo >&2 "Please remove headers_check from your scripts." 1307 @echo >&2 "===============================================" 1308 1309ifdef CONFIG_HEADERS_INSTALL 1310prepare: headers 1311endif 1312 1313PHONY += scripts_unifdef 1314scripts_unifdef: scripts_basic 1315 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1316 1317# --------------------------------------------------------------------------- 1318# Install 1319 1320# Many distributions have the custom install script, /sbin/installkernel. 1321# If DKMS is installed, 'make install' will eventually recuses back 1322# to the this Makefile to build and install external modules. 1323# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1324 1325install: sub_make_done := 1326 1327# --------------------------------------------------------------------------- 1328# Tools 1329 1330ifdef CONFIG_STACK_VALIDATION 1331prepare: tools/objtool 1332endif 1333 1334ifdef CONFIG_BPF 1335ifdef CONFIG_DEBUG_INFO_BTF 1336prepare: tools/bpf/resolve_btfids 1337endif 1338endif 1339 1340PHONY += resolve_btfids_clean 1341 1342resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1343 1344# tools/bpf/resolve_btfids directory might not exist 1345# in output directory, skip its clean in that case 1346resolve_btfids_clean: 1347ifneq ($(wildcard $(resolve_btfids_O)),) 1348 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1349endif 1350 1351# Clear a bunch of variables before executing the submake 1352ifeq ($(quiet),silent_) 1353tools_silent=s 1354endif 1355 1356tools/: FORCE 1357 $(Q)mkdir -p $(objtree)/tools 1358 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1359 1360tools/%: FORCE 1361 $(Q)mkdir -p $(objtree)/tools 1362 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1363 1364# --------------------------------------------------------------------------- 1365# Kernel selftest 1366 1367PHONY += kselftest 1368kselftest: 1369 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1370 1371kselftest-%: FORCE 1372 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1373 1374PHONY += kselftest-merge 1375kselftest-merge: 1376 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1377 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1378 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1379 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1380 1381# --------------------------------------------------------------------------- 1382# Devicetree files 1383 1384ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1385dtstree := arch/$(SRCARCH)/boot/dts 1386endif 1387 1388ifneq ($(dtstree),) 1389 1390%.dtb: include/config/kernel.release scripts_dtc 1391 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1392 1393%.dtbo: include/config/kernel.release scripts_dtc 1394 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1395 1396PHONY += dtbs dtbs_install dtbs_check 1397dtbs: include/config/kernel.release scripts_dtc 1398 $(Q)$(MAKE) $(build)=$(dtstree) 1399 1400ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1401export CHECK_DTBS=y 1402dtbs: dt_binding_check 1403endif 1404 1405dtbs_check: dtbs 1406 1407dtbs_install: 1408 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1409 1410ifdef CONFIG_OF_EARLY_FLATTREE 1411all: dtbs 1412endif 1413 1414endif 1415 1416PHONY += scripts_dtc 1417scripts_dtc: scripts_basic 1418 $(Q)$(MAKE) $(build)=scripts/dtc 1419 1420ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1421export CHECK_DT_BINDING=y 1422endif 1423 1424PHONY += dt_binding_check 1425dt_binding_check: scripts_dtc 1426 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1427 1428# --------------------------------------------------------------------------- 1429# Modules 1430 1431ifdef CONFIG_MODULES 1432 1433# By default, build modules as well 1434 1435all: modules 1436 1437# When we're building modules with modversions, we need to consider 1438# the built-in objects during the descend as well, in order to 1439# make sure the checksums are up to date before we record them. 1440ifdef CONFIG_MODVERSIONS 1441 KBUILD_BUILTIN := 1 1442endif 1443 1444# Build modules 1445# 1446# A module can be listed more than once in obj-m resulting in 1447# duplicate lines in modules.order files. Those are removed 1448# using awk while concatenating to the final file. 1449 1450PHONY += modules 1451modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1452 1453cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1454 1455modules.order: $(subdir-modorder) FORCE 1456 $(call if_changed,modules_order) 1457 1458targets += modules.order 1459 1460# Target to prepare building external modules 1461PHONY += modules_prepare 1462modules_prepare: prepare 1463 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1464 1465export modules_sign_only := 1466 1467ifeq ($(CONFIG_MODULE_SIG),y) 1468PHONY += modules_sign 1469modules_sign: modules_install 1470 @: 1471 1472# modules_sign is a subset of modules_install. 1473# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1474ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1475modules_sign_only := y 1476endif 1477endif 1478 1479modinst_pre := 1480ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1481modinst_pre := __modinst_pre 1482endif 1483 1484modules_install: $(modinst_pre) 1485PHONY += __modinst_pre 1486__modinst_pre: 1487 @rm -rf $(MODLIB)/kernel 1488 @rm -f $(MODLIB)/source 1489 @mkdir -p $(MODLIB)/kernel 1490 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1491 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1492 rm -f $(MODLIB)/build ; \ 1493 ln -s $(CURDIR) $(MODLIB)/build ; \ 1494 fi 1495 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1496 @cp -f modules.builtin $(MODLIB)/ 1497 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1498 1499endif # CONFIG_MODULES 1500 1501### 1502# Cleaning is done on three levels. 1503# make clean Delete most generated files 1504# Leave enough to build external modules 1505# make mrproper Delete the current configuration, and all generated files 1506# make distclean Remove editor backup files, patch leftover files and the like 1507 1508# Directories & files removed with 'make clean' 1509CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1510 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1511 compile_commands.json .thinlto-cache 1512 1513# Directories & files removed with 'make mrproper' 1514MRPROPER_FILES += include/config include/generated \ 1515 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1516 debian snap tar-install \ 1517 .config .config.old .version \ 1518 Module.symvers \ 1519 certs/signing_key.pem certs/signing_key.x509 \ 1520 certs/x509.genkey \ 1521 vmlinux-gdb.py \ 1522 *.spec 1523 1524# clean - Delete most, but leave enough to build external modules 1525# 1526clean: rm-files := $(CLEAN_FILES) 1527 1528PHONY += archclean vmlinuxclean 1529 1530vmlinuxclean: 1531 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1532 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1533 1534clean: archclean vmlinuxclean resolve_btfids_clean 1535 1536# mrproper - Delete all generated files, including .config 1537# 1538mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1539mrproper-dirs := $(addprefix _mrproper_,scripts) 1540 1541PHONY += $(mrproper-dirs) mrproper 1542$(mrproper-dirs): 1543 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1544 1545mrproper: clean $(mrproper-dirs) 1546 $(call cmd,rmfiles) 1547 1548# distclean 1549# 1550PHONY += distclean 1551 1552distclean: mrproper 1553 @find . $(RCS_FIND_IGNORE) \ 1554 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1555 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1556 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1557 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1558 -type f -print | xargs rm -f 1559 1560 1561# Packaging of the kernel to various formats 1562# --------------------------------------------------------------------------- 1563 1564%src-pkg: FORCE 1565 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1566%pkg: include/config/kernel.release FORCE 1567 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1568 1569# Brief documentation of the typical targets used 1570# --------------------------------------------------------------------------- 1571 1572boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1573boards := $(sort $(notdir $(boards))) 1574board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1575board-dirs := $(sort $(notdir $(board-dirs:/=))) 1576 1577PHONY += help 1578help: 1579 @echo 'Cleaning targets:' 1580 @echo ' clean - Remove most generated files but keep the config and' 1581 @echo ' enough build support to build external modules' 1582 @echo ' mrproper - Remove all generated files + config + various backup files' 1583 @echo ' distclean - mrproper + remove editor backup and patch files' 1584 @echo '' 1585 @echo 'Configuration targets:' 1586 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1587 @echo '' 1588 @echo 'Other generic targets:' 1589 @echo ' all - Build all targets marked with [*]' 1590 @echo '* vmlinux - Build the bare kernel' 1591 @echo '* modules - Build all modules' 1592 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1593 @echo ' dir/ - Build all files in dir and below' 1594 @echo ' dir/file.[ois] - Build specified target only' 1595 @echo ' dir/file.ll - Build the LLVM assembly file' 1596 @echo ' (requires compiler support for LLVM assembly generation)' 1597 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1598 @echo ' (requires a recent binutils and recent build (System.map))' 1599 @echo ' dir/file.ko - Build module including final link' 1600 @echo ' modules_prepare - Set up for building external modules' 1601 @echo ' tags/TAGS - Generate tags file for editors' 1602 @echo ' cscope - Generate cscope index' 1603 @echo ' gtags - Generate GNU GLOBAL index' 1604 @echo ' kernelrelease - Output the release version string (use with make -s)' 1605 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1606 @echo ' image_name - Output the image name (use with make -s)' 1607 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1608 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1609 echo '' 1610 @echo 'Static analysers:' 1611 @echo ' checkstack - Generate a list of stack hogs' 1612 @echo ' versioncheck - Sanity check on version.h usage' 1613 @echo ' includecheck - Check for duplicate included header files' 1614 @echo ' export_report - List the usages of all exported symbols' 1615 @echo ' headerdep - Detect inclusion cycles in headers' 1616 @echo ' coccicheck - Check with Coccinelle' 1617 @echo ' clang-analyzer - Check with clang static analyzer' 1618 @echo ' clang-tidy - Check with clang-tidy' 1619 @echo '' 1620 @echo 'Tools:' 1621 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1622 @echo '' 1623 @echo 'Kernel selftest:' 1624 @echo ' kselftest - Build and run kernel selftest' 1625 @echo ' Build, install, and boot kernel before' 1626 @echo ' running kselftest on it' 1627 @echo ' Run as root for full coverage' 1628 @echo ' kselftest-all - Build kernel selftest' 1629 @echo ' kselftest-install - Build and install kernel selftest' 1630 @echo ' kselftest-clean - Remove all generated kselftest files' 1631 @echo ' kselftest-merge - Merge all the config dependencies of' 1632 @echo ' kselftest to existing .config.' 1633 @echo '' 1634 @$(if $(dtstree), \ 1635 echo 'Devicetree:'; \ 1636 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1637 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1638 echo ' dt_binding_check - Validate device tree binding documents'; \ 1639 echo ' dtbs_check - Validate device tree source files';\ 1640 echo '') 1641 1642 @echo 'Userspace tools targets:' 1643 @echo ' use "make tools/help"' 1644 @echo ' or "cd tools; make help"' 1645 @echo '' 1646 @echo 'Kernel packaging:' 1647 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1648 @echo '' 1649 @echo 'Documentation targets:' 1650 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1651 @echo '' 1652 @echo 'Architecture specific targets ($(SRCARCH)):' 1653 @$(if $(archhelp),$(archhelp),\ 1654 echo ' No architecture specific help defined for $(SRCARCH)') 1655 @echo '' 1656 @$(if $(boards), \ 1657 $(foreach b, $(boards), \ 1658 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1659 echo '') 1660 @$(if $(board-dirs), \ 1661 $(foreach b, $(board-dirs), \ 1662 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1663 printf " %-16s - Show all of the above\\n" help-boards; \ 1664 echo '') 1665 1666 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1667 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1668 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1669 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1670 @echo ' (sparse by default)' 1671 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1672 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1673 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1674 @echo ' 1: warnings which may be relevant and do not occur too often' 1675 @echo ' 2: warnings which occur quite often but may still be relevant' 1676 @echo ' 3: more obscure warnings, can most likely be ignored' 1677 @echo ' Multiple levels can be combined with W=12 or W=123' 1678 @echo '' 1679 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1680 @echo 'For further info see the ./README file' 1681 1682 1683help-board-dirs := $(addprefix help-,$(board-dirs)) 1684 1685help-boards: $(help-board-dirs) 1686 1687boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1688 1689$(help-board-dirs): help-%: 1690 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1691 @$(if $(boards-per-dir), \ 1692 $(foreach b, $(boards-per-dir), \ 1693 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1694 echo '') 1695 1696 1697# Documentation targets 1698# --------------------------------------------------------------------------- 1699DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1700 linkcheckdocs dochelp refcheckdocs 1701PHONY += $(DOC_TARGETS) 1702$(DOC_TARGETS): 1703 $(Q)$(MAKE) $(build)=Documentation $@ 1704 1705# Misc 1706# --------------------------------------------------------------------------- 1707 1708PHONY += scripts_gdb 1709scripts_gdb: prepare0 1710 $(Q)$(MAKE) $(build)=scripts/gdb 1711 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1712 1713ifdef CONFIG_GDB_SCRIPTS 1714all: scripts_gdb 1715endif 1716 1717else # KBUILD_EXTMOD 1718 1719### 1720# External module support. 1721# When building external modules the kernel used as basis is considered 1722# read-only, and no consistency checks are made and the make 1723# system is not used on the basis kernel. If updates are required 1724# in the basis kernel ordinary make commands (without M=...) must be used. 1725 1726# We are always building only modules. 1727KBUILD_BUILTIN := 1728KBUILD_MODULES := 1 1729 1730build-dirs := $(KBUILD_EXTMOD) 1731$(MODORDER): descend 1732 @: 1733 1734compile_commands.json: $(extmod_prefix)compile_commands.json 1735PHONY += compile_commands.json 1736 1737clean-dirs := $(KBUILD_EXTMOD) 1738clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1739 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1740 1741PHONY += prepare 1742# now expand this into a simple variable to reduce the cost of shell evaluations 1743prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1744prepare: 1745 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \ 1746 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1747 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \ 1748 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1749 fi 1750 1751PHONY += help 1752help: 1753 @echo ' Building external modules.' 1754 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1755 @echo '' 1756 @echo ' modules - default target, build the module(s)' 1757 @echo ' modules_install - install the module' 1758 @echo ' clean - remove generated files in module directory only' 1759 @echo '' 1760 1761# no-op for external module builds 1762PHONY += modules_prepare 1763 1764endif # KBUILD_EXTMOD 1765 1766# --------------------------------------------------------------------------- 1767# Modules 1768 1769PHONY += modules modules_install 1770 1771ifdef CONFIG_MODULES 1772 1773modules: modules_check 1774 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1775 1776PHONY += modules_check 1777modules_check: $(MODORDER) 1778 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1779 1780quiet_cmd_depmod = DEPMOD $(MODLIB) 1781 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1782 $(KERNELRELEASE) 1783 1784modules_install: 1785 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1786 $(call cmd,depmod) 1787 1788else # CONFIG_MODULES 1789 1790# Modules not configured 1791# --------------------------------------------------------------------------- 1792 1793modules modules_install: 1794 @echo >&2 '***' 1795 @echo >&2 '*** The present kernel configuration has modules disabled.' 1796 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1797 @echo >&2 '*** to enable CONFIG_MODULES.' 1798 @echo >&2 '***' 1799 @exit 1 1800 1801endif # CONFIG_MODULES 1802 1803# Single targets 1804# --------------------------------------------------------------------------- 1805# To build individual files in subdirectories, you can do like this: 1806# 1807# make foo/bar/baz.s 1808# 1809# The supported suffixes for single-target are listed in 'single-targets' 1810# 1811# To build only under specific subdirectories, you can do like this: 1812# 1813# make foo/bar/baz/ 1814 1815ifdef single-build 1816 1817# .ko is special because modpost is needed 1818single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1819single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1820 1821$(single-ko): single_modpost 1822 @: 1823$(single-no-ko): descend 1824 @: 1825 1826ifeq ($(KBUILD_EXTMOD),) 1827# For the single build of in-tree modules, use a temporary file to avoid 1828# the situation of modules_install installing an invalid modules.order. 1829MODORDER := .modules.tmp 1830endif 1831 1832PHONY += single_modpost 1833single_modpost: $(single-no-ko) modules_prepare 1834 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1835 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1836 1837KBUILD_MODULES := 1 1838 1839export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1840 1841# trim unrelated directories 1842build-dirs := $(foreach d, $(build-dirs), \ 1843 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1844 1845endif 1846 1847ifndef CONFIG_MODULES 1848KBUILD_MODULES := 1849endif 1850 1851# Handle descending into subdirectories listed in $(build-dirs) 1852# Preset locale variables to speed up the build process. Limit locale 1853# tweaks to this spot to avoid wrong language settings when running 1854# make menuconfig etc. 1855# Error messages still appears in the original language 1856PHONY += descend $(build-dirs) 1857descend: $(build-dirs) 1858$(build-dirs): prepare 1859 $(Q)$(MAKE) $(build)=$@ \ 1860 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1861 need-builtin=1 need-modorder=1 1862 1863clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1864PHONY += $(clean-dirs) clean 1865$(clean-dirs): 1866 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1867 1868clean: $(clean-dirs) 1869 $(call cmd,rmfiles) 1870 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1871 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1872 -o -name '*.ko.*' \ 1873 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1874 -o -name '*.dwo' -o -name '*.lst' \ 1875 -o -name '*.su' -o -name '*.mod' \ 1876 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1877 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1878 -o -name '*.asn1.[ch]' \ 1879 -o -name '*.symtypes' -o -name 'modules.order' \ 1880 -o -name '.tmp_*.o.*' \ 1881 -o -name '*.c.[012]*.*' \ 1882 -o -name '*.ll' \ 1883 -o -name '*.gcno' \ 1884 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1885 1886# Generate tags for editors 1887# --------------------------------------------------------------------------- 1888quiet_cmd_tags = GEN $@ 1889 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1890 1891tags TAGS cscope gtags: FORCE 1892 $(call cmd,tags) 1893 1894# Script to generate missing namespace dependencies 1895# --------------------------------------------------------------------------- 1896 1897PHONY += nsdeps 1898nsdeps: export KBUILD_NSDEPS=1 1899nsdeps: modules 1900 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1901 1902# Clang Tooling 1903# --------------------------------------------------------------------------- 1904 1905quiet_cmd_gen_compile_commands = GEN $@ 1906 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1907 1908$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1909 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1910 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1911 $(call if_changed,gen_compile_commands) 1912 1913targets += $(extmod_prefix)compile_commands.json 1914 1915PHONY += clang-tidy clang-analyzer 1916 1917ifdef CONFIG_CC_IS_CLANG 1918quiet_cmd_clang_tools = CHECK $< 1919 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1920 1921clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1922 $(call cmd,clang_tools) 1923else 1924clang-tidy clang-analyzer: 1925 @echo "$@ requires CC=clang" >&2 1926 @false 1927endif 1928 1929# Scripts to check various things for consistency 1930# --------------------------------------------------------------------------- 1931 1932PHONY += includecheck versioncheck coccicheck export_report 1933 1934includecheck: 1935 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1936 -name '*.[hcS]' -type f -print | sort \ 1937 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1938 1939versioncheck: 1940 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1941 -name '*.[hcS]' -type f -print | sort \ 1942 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1943 1944coccicheck: 1945 $(Q)$(BASH) $(srctree)/scripts/$@ 1946 1947export_report: 1948 $(PERL) $(srctree)/scripts/export_report.pl 1949 1950PHONY += checkstack kernelrelease kernelversion image_name 1951 1952# UML needs a little special treatment here. It wants to use the host 1953# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1954# else wants $(ARCH), including people doing cross-builds, which means 1955# that $(SUBARCH) doesn't work here. 1956ifeq ($(ARCH), um) 1957CHECKSTACK_ARCH := $(SUBARCH) 1958else 1959CHECKSTACK_ARCH := $(ARCH) 1960endif 1961checkstack: 1962 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1963 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1964 1965kernelrelease: 1966 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1967 1968kernelversion: 1969 @echo $(KERNELVERSION) 1970 1971image_name: 1972 @echo $(KBUILD_IMAGE) 1973 1974quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1975 cmd_rmfiles = rm -rf $(rm-files) 1976 1977# read saved command lines for existing targets 1978existing-targets := $(wildcard $(sort $(targets))) 1979 1980-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1981 1982endif # config-build 1983endif # mixed-build 1984endif # need-sub-make 1985 1986PHONY += FORCE 1987FORCE: 1988 1989# Declare the contents of the PHONY variable as phony. We keep that 1990# information in a variable so we can use it in if_changed and friends. 1991.PHONY: $(PHONY) 1992