1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Frozen Wasteland 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 $(error building multiple external modules is not supported)) 131 132export KBUILD_EXTMOD 133 134# Kbuild will save output files in the current working directory. 135# This does not need to match to the root of the kernel source tree. 136# 137# For example, you can do this: 138# 139# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 140# 141# If you want to save output files in a different location, there are 142# two syntaxes to specify it. 143# 144# 1) O= 145# Use "make O=dir/to/store/output/files/" 146# 147# 2) Set KBUILD_OUTPUT 148# Set the environment variable KBUILD_OUTPUT to point to the output directory. 149# export KBUILD_OUTPUT=dir/to/store/output/files/; make 150# 151# The O= assignment takes precedence over the KBUILD_OUTPUT environment 152# variable. 153 154# Do we want to change the working directory? 155ifeq ("$(origin O)", "command line") 156 KBUILD_OUTPUT := $(O) 157endif 158 159ifneq ($(KBUILD_OUTPUT),) 160# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 161# expand a shell special character '~'. We use a somewhat tedious way here. 162abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 163$(if $(abs_objtree),, \ 164 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 165 166# $(realpath ...) resolves symlinks 167abs_objtree := $(realpath $(abs_objtree)) 168else 169abs_objtree := $(CURDIR) 170endif # ifneq ($(KBUILD_OUTPUT),) 171 172ifeq ($(abs_objtree),$(CURDIR)) 173# Suppress "Entering directory ..." unless we are changing the work directory. 174MAKEFLAGS += --no-print-directory 175else 176need-sub-make := 1 177endif 178 179this-makefile := $(lastword $(MAKEFILE_LIST)) 180abs_srctree := $(realpath $(dir $(this-makefile))) 181 182ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 183$(error source directory cannot contain spaces or colons) 184endif 185 186ifneq ($(abs_srctree),$(abs_objtree)) 187# Look for make include files relative to root of kernel src 188# 189# This does not become effective immediately because MAKEFLAGS is re-parsed 190# once after the Makefile is read. We need to invoke sub-make. 191MAKEFLAGS += --include-dir=$(abs_srctree) 192need-sub-make := 1 193endif 194 195ifneq ($(filter 3.%,$(MAKE_VERSION)),) 196# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 197# We need to invoke sub-make to avoid implicit rules in the top Makefile. 198need-sub-make := 1 199# Cancel implicit rules for this Makefile. 200$(this-makefile): ; 201endif 202 203export abs_srctree abs_objtree 204export sub_make_done := 1 205 206ifeq ($(need-sub-make),1) 207 208PHONY += $(MAKECMDGOALS) __sub-make 209 210$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 211 @: 212 213# Invoke a second make in the output directory, passing relevant variables 214__sub-make: 215 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 216 217endif # need-sub-make 218endif # sub_make_done 219 220# We process the rest of the Makefile if this is the final invocation of make 221ifeq ($(need-sub-make),) 222 223# Do not print "Entering directory ...", 224# but we want to display it when entering to the output directory 225# so that IDEs/editors are able to understand relative filenames. 226MAKEFLAGS += --no-print-directory 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260 261clean-targets := %clean mrproper cleandocs 262no-dot-config-targets := $(clean-targets) \ 263 cscope gtags TAGS tags help% %docs check% coccicheck \ 264 $(version_h) headers headers_% archheaders archscripts \ 265 %asm-generic kernelversion %src-pkg dt_binding_check \ 266 outputmakefile 267no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease 268single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 269 270config-build := 271mixed-build := 272need-config := 1 273may-sync-config := 1 274single-build := 275 276ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 277 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 need-config := 279 endif 280endif 281 282ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 283 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 may-sync-config := 285 endif 286endif 287 288ifneq ($(KBUILD_EXTMOD),) 289 may-sync-config := 290endif 291 292ifeq ($(KBUILD_EXTMOD),) 293 ifneq ($(filter %config,$(MAKECMDGOALS)),) 294 config-build := 1 295 ifneq ($(words $(MAKECMDGOALS)),1) 296 mixed-build := 1 297 endif 298 endif 299endif 300 301# We cannot build single targets and the others at the same time 302ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 303 single-build := 1 304 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 305 mixed-build := 1 306 endif 307endif 308 309# For "make -j clean all", "make -j mrproper defconfig all", etc. 310ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 311 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 312 mixed-build := 1 313 endif 314endif 315 316# install and modules_install need also be processed one by one 317ifneq ($(filter install,$(MAKECMDGOALS)),) 318 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 319 mixed-build := 1 320 endif 321endif 322 323ifdef mixed-build 324# =========================================================================== 325# We're called with mixed targets (*config and build targets). 326# Handle them one by one. 327 328PHONY += $(MAKECMDGOALS) __build_one_by_one 329 330$(MAKECMDGOALS): __build_one_by_one 331 @: 332 333__build_one_by_one: 334 $(Q)set -e; \ 335 for i in $(MAKECMDGOALS); do \ 336 $(MAKE) -f $(srctree)/Makefile $$i; \ 337 done 338 339else # !mixed-build 340 341include scripts/Kbuild.include 342 343# Read KERNELRELEASE from include/config/kernel.release (if it exists) 344KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 345KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 346export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 347 348include scripts/subarch.include 349 350# Cross compiling and selecting different set of gcc/bin-utils 351# --------------------------------------------------------------------------- 352# 353# When performing cross compilation for other architectures ARCH shall be set 354# to the target architecture. (See arch/* for the possibilities). 355# ARCH can be set during invocation of make: 356# make ARCH=ia64 357# Another way is to have ARCH set in the environment. 358# The default ARCH is the host where make is executed. 359 360# CROSS_COMPILE specify the prefix used for all executables used 361# during compilation. Only gcc and related bin-utils executables 362# are prefixed with $(CROSS_COMPILE). 363# CROSS_COMPILE can be set on the command line 364# make CROSS_COMPILE=ia64-linux- 365# Alternatively CROSS_COMPILE can be set in the environment. 366# Default value for CROSS_COMPILE is not to prefix executables 367# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 368ARCH ?= $(SUBARCH) 369 370# Architecture as present in compile.h 371UTS_MACHINE := $(ARCH) 372SRCARCH := $(ARCH) 373 374# Additional ARCH settings for x86 375ifeq ($(ARCH),i386) 376 SRCARCH := x86 377endif 378ifeq ($(ARCH),x86_64) 379 SRCARCH := x86 380endif 381 382# Additional ARCH settings for sparc 383ifeq ($(ARCH),sparc32) 384 SRCARCH := sparc 385endif 386ifeq ($(ARCH),sparc64) 387 SRCARCH := sparc 388endif 389 390# Additional ARCH settings for sh 391ifeq ($(ARCH),sh64) 392 SRCARCH := sh 393endif 394 395KCONFIG_CONFIG ?= .config 396export KCONFIG_CONFIG 397 398# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 399export KBUILD_DEFCONFIG := defconfig 400 401# SHELL used by kbuild 402CONFIG_SHELL := sh 403 404HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 405HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 406HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 407 408ifneq ($(LLVM),) 409HOSTCC = clang 410HOSTCXX = clang++ 411else 412HOSTCC = gcc 413HOSTCXX = g++ 414endif 415 416export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 417 -O2 -fomit-frame-pointer -std=gnu89 418export KBUILD_USERLDFLAGS := 419 420KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 421KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 422KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 423KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 424 425# Make variables (CC, etc...) 426CPP = $(CC) -E 427ifneq ($(LLVM),) 428CC = clang 429LD = ld.lld 430AR = llvm-ar 431NM = llvm-nm 432OBJCOPY = llvm-objcopy 433OBJDUMP = llvm-objdump 434READELF = llvm-readelf 435STRIP = llvm-strip 436else 437CC = $(CROSS_COMPILE)gcc 438LD = $(CROSS_COMPILE)ld 439AR = $(CROSS_COMPILE)ar 440NM = $(CROSS_COMPILE)nm 441OBJCOPY = $(CROSS_COMPILE)objcopy 442OBJDUMP = $(CROSS_COMPILE)objdump 443READELF = $(CROSS_COMPILE)readelf 444STRIP = $(CROSS_COMPILE)strip 445endif 446PAHOLE = pahole 447RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 448LEX = flex 449YACC = bison 450AWK = awk 451INSTALLKERNEL := installkernel 452DEPMOD = depmod 453PERL = perl 454PYTHON3 = python3 455CHECK = sparse 456BASH = bash 457KGZIP = gzip 458KBZIP2 = bzip2 459KLZOP = lzop 460LZMA = lzma 461LZ4 = lz4c 462XZ = xz 463ZSTD = zstd 464 465CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 466 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 467NOSTDINC_FLAGS := 468CFLAGS_MODULE = 469AFLAGS_MODULE = 470LDFLAGS_MODULE = 471CFLAGS_KERNEL = 472AFLAGS_KERNEL = 473LDFLAGS_vmlinux = 474 475# Use USERINCLUDE when you must reference the UAPI directories only. 476USERINCLUDE := \ 477 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 478 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 479 -I$(srctree)/include/uapi \ 480 -I$(objtree)/include/generated/uapi \ 481 -include $(srctree)/include/linux/kconfig.h 482 483# Use LINUXINCLUDE when you must reference the include/ directory. 484# Needed to be compatible with the O= option 485LINUXINCLUDE := \ 486 -I$(srctree)/arch/$(SRCARCH)/include \ 487 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 488 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 489 -I$(objtree)/include \ 490 $(USERINCLUDE) 491 492KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 493KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 494 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 495 -Werror=implicit-function-declaration -Werror=implicit-int \ 496 -Werror=return-type -Wno-format-security \ 497 -std=gnu89 498KBUILD_CPPFLAGS := -D__KERNEL__ 499KBUILD_AFLAGS_KERNEL := 500KBUILD_CFLAGS_KERNEL := 501KBUILD_AFLAGS_MODULE := -DMODULE 502KBUILD_CFLAGS_MODULE := -DMODULE 503KBUILD_LDFLAGS_MODULE := 504KBUILD_LDFLAGS := 505CLANG_FLAGS := 506 507export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 508export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 509export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 510export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 511export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 512 513export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 514export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 515export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 516export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 517export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 518 519# Files to ignore in find ... statements 520 521export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 522 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 523 -prune -o 524export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 525 --exclude CVS --exclude .pc --exclude .hg --exclude .git 526 527# =========================================================================== 528# Rules shared between *config targets and build targets 529 530# Basic helpers built in scripts/basic/ 531PHONY += scripts_basic 532scripts_basic: 533 $(Q)$(MAKE) $(build)=scripts/basic 534 $(Q)rm -f .tmp_quiet_recordmcount 535 536PHONY += outputmakefile 537# Before starting out-of-tree build, make sure the source tree is clean. 538# outputmakefile generates a Makefile in the output directory, if using a 539# separate output directory. This allows convenient use of make in the 540# output directory. 541# At the same time when output Makefile generated, generate .gitignore to 542# ignore whole output directory 543outputmakefile: 544ifdef building_out_of_srctree 545 $(Q)if [ -f $(srctree)/.config -o \ 546 -d $(srctree)/include/config -o \ 547 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 548 echo >&2 "***"; \ 549 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 550 echo >&2 "*** in $(abs_srctree)";\ 551 echo >&2 "***"; \ 552 false; \ 553 fi 554 $(Q)ln -fsn $(srctree) source 555 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 556 $(Q)test -e .gitignore || \ 557 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 558endif 559 560# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 561# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 562# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 563# and from include/config/auto.conf.cmd to detect the compiler upgrade. 564CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g') 565 566ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 567ifneq ($(CROSS_COMPILE),) 568CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 569GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 570CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 571GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 572endif 573ifneq ($(GCC_TOOLCHAIN),) 574CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 575endif 576ifneq ($(LLVM_IAS),1) 577CLANG_FLAGS += -no-integrated-as 578endif 579CLANG_FLAGS += -Werror=unknown-warning-option 580KBUILD_CFLAGS += $(CLANG_FLAGS) 581KBUILD_AFLAGS += $(CLANG_FLAGS) 582export CLANG_FLAGS 583endif 584 585ifdef config-build 586# =========================================================================== 587# *config targets only - make sure prerequisites are updated, and descend 588# in scripts/kconfig to make the *config target 589 590# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 591# KBUILD_DEFCONFIG may point out an alternative default configuration 592# used for 'make defconfig' 593include arch/$(SRCARCH)/Makefile 594export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 595 596config: outputmakefile scripts_basic FORCE 597 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 598 599%config: outputmakefile scripts_basic FORCE 600 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 601 602else #!config-build 603# =========================================================================== 604# Build targets only - this includes vmlinux, arch specific targets, clean 605# targets and others. In general all targets except *config targets. 606 607# If building an external module we do not care about the all: rule 608# but instead __all depend on modules 609PHONY += all 610ifeq ($(KBUILD_EXTMOD),) 611__all: all 612else 613__all: modules 614endif 615 616# Decide whether to build built-in, modular, or both. 617# Normally, just do built-in. 618 619KBUILD_MODULES := 620KBUILD_BUILTIN := 1 621 622# If we have only "make modules", don't compile built-in objects. 623ifeq ($(MAKECMDGOALS),modules) 624 KBUILD_BUILTIN := 625endif 626 627# If we have "make <whatever> modules", compile modules 628# in addition to whatever we do anyway. 629# Just "make" or "make all" shall build modules as well 630 631ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 632 KBUILD_MODULES := 1 633endif 634 635ifeq ($(MAKECMDGOALS),) 636 KBUILD_MODULES := 1 637endif 638 639export KBUILD_MODULES KBUILD_BUILTIN 640 641ifdef need-config 642include include/config/auto.conf 643endif 644 645ifeq ($(KBUILD_EXTMOD),) 646# Objects we will link into vmlinux / subdirs we need to visit 647core-y := init/ usr/ 648drivers-y := drivers/ sound/ 649drivers-$(CONFIG_SAMPLES) += samples/ 650drivers-$(CONFIG_NET) += net/ 651drivers-y += virt/ 652libs-y := lib/ 653endif # KBUILD_EXTMOD 654 655# The all: target is the default when no target is given on the 656# command line. 657# This allow a user to issue only 'make' to build a kernel including modules 658# Defaults to vmlinux, but the arch makefile usually adds further targets 659all: vmlinux 660 661CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 662 $(call cc-option,-fno-tree-loop-im) \ 663 $(call cc-disable-warning,maybe-uninitialized,) 664export CFLAGS_GCOV 665 666# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 667ifdef CONFIG_FUNCTION_TRACER 668 CC_FLAGS_FTRACE := -pg 669endif 670 671RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 672RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 673RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 674RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 675RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 676RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 677export RETPOLINE_CFLAGS 678export RETPOLINE_VDSO_CFLAGS 679 680include arch/$(SRCARCH)/Makefile 681 682ifdef need-config 683ifdef may-sync-config 684# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 685# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 686# because some architectures define CROSS_COMPILE there. 687include include/config/auto.conf.cmd 688 689$(KCONFIG_CONFIG): 690 @echo >&2 '***' 691 @echo >&2 '*** Configuration file "$@" not found!' 692 @echo >&2 '***' 693 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 694 @echo >&2 '*** "make menuconfig" or "make xconfig").' 695 @echo >&2 '***' 696 @/bin/false 697 698# The actual configuration files used during the build are stored in 699# include/generated/ and include/config/. Update them if .config is newer than 700# include/config/auto.conf (which mirrors .config). 701# 702# This exploits the 'multi-target pattern rule' trick. 703# The syncconfig should be executed only once to make all the targets. 704# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 705quiet_cmd_syncconfig = SYNC $@ 706 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 707 708%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 709 +$(call cmd,syncconfig) 710else # !may-sync-config 711# External modules and some install targets need include/generated/autoconf.h 712# and include/config/auto.conf but do not care if they are up-to-date. 713# Use auto.conf to trigger the test 714PHONY += include/config/auto.conf 715 716include/config/auto.conf: 717 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 718 echo >&2; \ 719 echo >&2 " ERROR: Kernel configuration is invalid."; \ 720 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 721 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 722 echo >&2 ; \ 723 /bin/false) 724 725endif # may-sync-config 726endif # need-config 727 728KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 729KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 730KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 731KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 732KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 733 734ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 735KBUILD_CFLAGS += -O2 736else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 737KBUILD_CFLAGS += -O3 738else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 739KBUILD_CFLAGS += -Os 740endif 741 742# Tell gcc to never replace conditional load with a non-conditional one 743KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 744KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 745 746ifdef CONFIG_READABLE_ASM 747# Disable optimizations that make assembler listings hard to read. 748# reorder blocks reorders the control in the function 749# ipa clone creates specialized cloned functions 750# partial inlining inlines only parts of functions 751KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 752 $(call cc-option,-fno-ipa-cp-clone,) \ 753 $(call cc-option,-fno-partial-inlining) 754endif 755 756ifneq ($(CONFIG_FRAME_WARN),0) 757KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 758endif 759 760stackp-flags-y := -fno-stack-protector 761stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 762stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 763 764KBUILD_CFLAGS += $(stackp-flags-y) 765 766ifdef CONFIG_CC_IS_CLANG 767KBUILD_CPPFLAGS += -Qunused-arguments 768KBUILD_CFLAGS += -Wno-format-invalid-specifier 769KBUILD_CFLAGS += -Wno-gnu 770# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 771# source of a reference will be _MergedGlobals and not on of the whitelisted names. 772# See modpost pattern 2 773KBUILD_CFLAGS += -mno-global-merge 774else 775 776# These warnings generated too much noise in a regular build. 777# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 778KBUILD_CFLAGS += -Wno-unused-but-set-variable 779 780# Warn about unmarked fall-throughs in switch statement. 781# Disabled for clang while comment to attribute conversion happens and 782# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 783KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 784endif 785 786KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 787ifdef CONFIG_FRAME_POINTER 788KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 789else 790# Some targets (ARM with Thumb2, for example), can't be built with frame 791# pointers. For those, we don't have FUNCTION_TRACER automatically 792# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 793# incompatible with -fomit-frame-pointer with current GCC, so we don't use 794# -fomit-frame-pointer with FUNCTION_TRACER. 795ifndef CONFIG_FUNCTION_TRACER 796KBUILD_CFLAGS += -fomit-frame-pointer 797endif 798endif 799 800# Initialize all stack variables with a 0xAA pattern. 801ifdef CONFIG_INIT_STACK_ALL_PATTERN 802KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 803endif 804 805# Initialize all stack variables with a zero value. 806ifdef CONFIG_INIT_STACK_ALL_ZERO 807# Future support for zero initialization is still being debated, see 808# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 809# renamed or dropped. 810KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 811KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 812endif 813 814DEBUG_CFLAGS := 815 816# Workaround for GCC versions < 5.0 817# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 818ifdef CONFIG_CC_IS_GCC 819DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 820endif 821 822ifdef CONFIG_DEBUG_INFO 823 824ifdef CONFIG_DEBUG_INFO_SPLIT 825DEBUG_CFLAGS += -gsplit-dwarf 826else 827DEBUG_CFLAGS += -g 828endif 829 830ifneq ($(LLVM_IAS),1) 831KBUILD_AFLAGS += -Wa,-gdwarf-2 832endif 833 834ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 835dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 836dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 837DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 838endif 839 840ifdef CONFIG_DEBUG_INFO_REDUCED 841DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 842 $(call cc-option,-fno-var-tracking) 843endif 844 845ifdef CONFIG_DEBUG_INFO_COMPRESSED 846DEBUG_CFLAGS += -gz=zlib 847KBUILD_AFLAGS += -gz=zlib 848KBUILD_LDFLAGS += --compress-debug-sections=zlib 849endif 850 851endif # CONFIG_DEBUG_INFO 852 853KBUILD_CFLAGS += $(DEBUG_CFLAGS) 854export DEBUG_CFLAGS 855 856ifdef CONFIG_FUNCTION_TRACER 857ifdef CONFIG_FTRACE_MCOUNT_USE_CC 858 CC_FLAGS_FTRACE += -mrecord-mcount 859 ifdef CONFIG_HAVE_NOP_MCOUNT 860 ifeq ($(call cc-option-yn, -mnop-mcount),y) 861 CC_FLAGS_FTRACE += -mnop-mcount 862 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 863 endif 864 endif 865endif 866ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 867 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 868endif 869ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 870 ifdef CONFIG_HAVE_C_RECORDMCOUNT 871 BUILD_C_RECORDMCOUNT := y 872 export BUILD_C_RECORDMCOUNT 873 endif 874endif 875ifdef CONFIG_HAVE_FENTRY 876 ifeq ($(call cc-option-yn, -mfentry),y) 877 CC_FLAGS_FTRACE += -mfentry 878 CC_FLAGS_USING += -DCC_USING_FENTRY 879 endif 880endif 881export CC_FLAGS_FTRACE 882KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 883KBUILD_AFLAGS += $(CC_FLAGS_USING) 884endif 885 886# We trigger additional mismatches with less inlining 887ifdef CONFIG_DEBUG_SECTION_MISMATCH 888KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 889endif 890 891ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 892KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 893LDFLAGS_vmlinux += --gc-sections 894endif 895 896ifdef CONFIG_SHADOW_CALL_STACK 897CC_FLAGS_SCS := -fsanitize=shadow-call-stack 898KBUILD_CFLAGS += $(CC_FLAGS_SCS) 899export CC_FLAGS_SCS 900endif 901 902ifdef CONFIG_LTO_CLANG 903ifdef CONFIG_LTO_CLANG_THIN 904CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 905KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 906else 907CC_FLAGS_LTO := -flto 908endif 909CC_FLAGS_LTO += -fvisibility=hidden 910 911# Limit inlining across translation units to reduce binary size 912KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 913endif 914 915ifdef CONFIG_LTO 916KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 917KBUILD_AFLAGS += -fno-lto 918export CC_FLAGS_LTO 919endif 920 921ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 922KBUILD_CFLAGS += -falign-functions=32 923endif 924 925# arch Makefile may override CC so keep this after arch Makefile is included 926NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 927 928# warn about C99 declaration after statement 929KBUILD_CFLAGS += -Wdeclaration-after-statement 930 931# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 932KBUILD_CFLAGS += -Wvla 933 934# disable pointer signed / unsigned warnings in gcc 4.0 935KBUILD_CFLAGS += -Wno-pointer-sign 936 937# disable stringop warnings in gcc 8+ 938KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 939 940# We'll want to enable this eventually, but it's not going away for 5.7 at least 941KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 942KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 943KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 944 945# Another good warning that we'll want to enable eventually 946KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 947 948# Enabled with W=2, disabled by default as noisy 949KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 950 951# disable invalid "can't wrap" optimizations for signed / pointers 952KBUILD_CFLAGS += -fno-strict-overflow 953 954# Make sure -fstack-check isn't enabled (like gentoo apparently did) 955KBUILD_CFLAGS += -fno-stack-check 956 957# conserve stack if available 958KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 959 960# Prohibit date/time macros, which would make the build non-deterministic 961KBUILD_CFLAGS += -Werror=date-time 962 963# enforce correct pointer usage 964KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 965 966# Require designated initializers for all marked structures 967KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 968 969# change __FILE__ to the relative path from the srctree 970KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 971 972# include additional Makefiles when needed 973include-y := scripts/Makefile.extrawarn 974include-$(CONFIG_KASAN) += scripts/Makefile.kasan 975include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 976include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 977include-$(CONFIG_KCOV) += scripts/Makefile.kcov 978include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 979 980include $(addprefix $(srctree)/, $(include-y)) 981 982# scripts/Makefile.gcc-plugins is intentionally included last. 983# Do not add $(call cc-option,...) below this line. When you build the kernel 984# from the clean source tree, the GCC plugins do not exist at this point. 985 986# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 987KBUILD_CPPFLAGS += $(KCPPFLAGS) 988KBUILD_AFLAGS += $(KAFLAGS) 989KBUILD_CFLAGS += $(KCFLAGS) 990 991KBUILD_LDFLAGS_MODULE += --build-id=sha1 992LDFLAGS_vmlinux += --build-id=sha1 993 994ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 995LDFLAGS_vmlinux += $(call ld-option, -X,) 996endif 997 998ifeq ($(CONFIG_RELR),y) 999LDFLAGS_vmlinux += --pack-dyn-relocs=relr 1000endif 1001 1002# We never want expected sections to be placed heuristically by the 1003# linker. All sections should be explicitly named in the linker script. 1004ifdef CONFIG_LD_ORPHAN_WARN 1005LDFLAGS_vmlinux += --orphan-handling=warn 1006endif 1007 1008# Align the bit size of userspace programs with the kernel 1009KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1010KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1011 1012# make the checker run with the right architecture 1013CHECKFLAGS += --arch=$(ARCH) 1014 1015# insure the checker run with the right endianness 1016CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1017 1018# the checker needs the correct machine size 1019CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1020 1021# Default kernel image to build when no specific target is given. 1022# KBUILD_IMAGE may be overruled on the command line or 1023# set in the environment 1024# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1025# this default value 1026export KBUILD_IMAGE ?= vmlinux 1027 1028# 1029# INSTALL_PATH specifies where to place the updated kernel and system map 1030# images. Default is /boot, but you can set it to other values 1031export INSTALL_PATH ?= /boot 1032 1033# 1034# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1035# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1036# an argument if needed. Otherwise it defaults to the kernel install path 1037# 1038export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1039 1040# 1041# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1042# relocations required by build roots. This is not defined in the 1043# makefile but the argument can be passed to make if needed. 1044# 1045 1046MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1047export MODLIB 1048 1049# 1050# INSTALL_MOD_STRIP, if defined, will cause modules to be 1051# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1052# the default option --strip-debug will be used. Otherwise, 1053# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1054 1055ifdef INSTALL_MOD_STRIP 1056ifeq ($(INSTALL_MOD_STRIP),1) 1057mod_strip_cmd = $(STRIP) --strip-debug 1058else 1059mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1060endif # INSTALL_MOD_STRIP=1 1061else 1062mod_strip_cmd = true 1063endif # INSTALL_MOD_STRIP 1064export mod_strip_cmd 1065 1066# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1067# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1068# or CONFIG_MODULE_COMPRESS_XZ. 1069 1070mod_compress_cmd = true 1071ifdef CONFIG_MODULE_COMPRESS 1072 ifdef CONFIG_MODULE_COMPRESS_GZIP 1073 mod_compress_cmd = $(KGZIP) -n -f 1074 endif # CONFIG_MODULE_COMPRESS_GZIP 1075 ifdef CONFIG_MODULE_COMPRESS_XZ 1076 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f 1077 endif # CONFIG_MODULE_COMPRESS_XZ 1078endif # CONFIG_MODULE_COMPRESS 1079export mod_compress_cmd 1080 1081ifdef CONFIG_MODULE_SIG_ALL 1082$(eval $(call config_filename,MODULE_SIG_KEY)) 1083 1084mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1085else 1086mod_sign_cmd = true 1087endif 1088export mod_sign_cmd 1089 1090HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1091 1092has_libelf = $(call try-run,\ 1093 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1094 1095ifdef CONFIG_STACK_VALIDATION 1096 ifeq ($(has_libelf),1) 1097 objtool_target := tools/objtool FORCE 1098 else 1099 SKIP_STACK_VALIDATION := 1 1100 export SKIP_STACK_VALIDATION 1101 endif 1102endif 1103 1104PHONY += resolve_btfids_clean 1105 1106resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1107 1108# tools/bpf/resolve_btfids directory might not exist 1109# in output directory, skip its clean in that case 1110resolve_btfids_clean: 1111ifneq ($(wildcard $(resolve_btfids_O)),) 1112 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1113endif 1114 1115ifdef CONFIG_BPF 1116ifdef CONFIG_DEBUG_INFO_BTF 1117 ifeq ($(has_libelf),1) 1118 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1119 else 1120 ERROR_RESOLVE_BTFIDS := 1 1121 endif 1122endif # CONFIG_DEBUG_INFO_BTF 1123endif # CONFIG_BPF 1124 1125PHONY += prepare0 1126 1127extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1128export MODORDER := $(extmod-prefix)modules.order 1129export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1130 1131ifeq ($(KBUILD_EXTMOD),) 1132core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1133 1134vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1135 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1136 $(libs-y) $(libs-m))) 1137 1138vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1139 $(patsubst %/,%,$(filter %/, $(core-) \ 1140 $(drivers-) $(libs-)))) 1141 1142subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1143 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1144 $(drivers-y) $(drivers-m))) 1145 1146build-dirs := $(vmlinux-dirs) 1147clean-dirs := $(vmlinux-alldirs) 1148 1149# Externally visible symbols (used by link-vmlinux.sh) 1150KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1151KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1152ifdef CONFIG_MODULES 1153KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1154KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1155else 1156KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1157endif 1158KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1159 1160export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1161export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1162# used by scripts/Makefile.package 1163export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1164 1165vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1166 1167# Recurse until adjust_autoksyms.sh is satisfied 1168PHONY += autoksyms_recursive 1169ifdef CONFIG_TRIM_UNUSED_KSYMS 1170# For the kernel to actually contain only the needed exported symbols, 1171# we have to build modules as well to determine what those symbols are. 1172# (this can be evaluated only once include/config/auto.conf has been included) 1173KBUILD_MODULES := 1 1174 1175autoksyms_recursive: descend modules.order 1176 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1177 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1178endif 1179 1180autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1181 1182quiet_cmd_autoksyms_h = GEN $@ 1183 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1184 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1185 1186$(autoksyms_h): 1187 $(call cmd,autoksyms_h) 1188 1189ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1190 1191# Final link of vmlinux with optional arch pass after final link 1192cmd_link-vmlinux = \ 1193 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1194 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1195 1196vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1197 +$(call if_changed,link-vmlinux) 1198 1199targets := vmlinux 1200 1201# The actual objects are generated when descending, 1202# make sure no implicit rule kicks in 1203$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1204 1205filechk_kernel.release = \ 1206 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1207 1208# Store (new) KERNELRELEASE string in include/config/kernel.release 1209include/config/kernel.release: FORCE 1210 $(call filechk,kernel.release) 1211 1212# Additional helpers built in scripts/ 1213# Carefully list dependencies so we do not try to build scripts twice 1214# in parallel 1215PHONY += scripts 1216scripts: scripts_basic scripts_dtc 1217 $(Q)$(MAKE) $(build)=$(@) 1218 1219# Things we need to do before we recursively start building the kernel 1220# or the modules are listed in "prepare". 1221# A multi level approach is used. prepareN is processed before prepareN-1. 1222# archprepare is used in arch Makefiles and when processed asm symlink, 1223# version.h and scripts_basic is processed / created. 1224 1225PHONY += prepare archprepare 1226 1227archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1228 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1229 include/generated/autoconf.h 1230 1231prepare0: archprepare 1232 $(Q)$(MAKE) $(build)=scripts/mod 1233 $(Q)$(MAKE) $(build)=. 1234 1235# All the preparing.. 1236prepare: prepare0 prepare-objtool prepare-resolve_btfids 1237 1238# Support for using generic headers in asm-generic 1239asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1240 1241PHONY += asm-generic uapi-asm-generic 1242asm-generic: uapi-asm-generic 1243 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1244 generic=include/asm-generic 1245uapi-asm-generic: 1246 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1247 generic=include/uapi/asm-generic 1248 1249PHONY += prepare-objtool prepare-resolve_btfids 1250prepare-objtool: $(objtool_target) 1251ifeq ($(SKIP_STACK_VALIDATION),1) 1252ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1253 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1254 @false 1255endif 1256ifdef CONFIG_UNWINDER_ORC 1257 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1258 @false 1259else 1260 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1261endif 1262endif 1263 1264prepare-resolve_btfids: $(resolve_btfids_target) 1265ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1266 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1267 @false 1268endif 1269# Generate some files 1270# --------------------------------------------------------------------------- 1271 1272# KERNELRELEASE can change from a few different places, meaning version.h 1273# needs to be updated, so this check is forced on all builds 1274 1275uts_len := 64 1276define filechk_utsrelease.h 1277 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1278 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1279 exit 1; \ 1280 fi; \ 1281 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1282endef 1283 1284define filechk_version.h 1285 if [ $(SUBLEVEL) -gt 255 ]; then \ 1286 echo \#define LINUX_VERSION_CODE $(shell \ 1287 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1288 else \ 1289 echo \#define LINUX_VERSION_CODE $(shell \ 1290 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1291 fi; \ 1292 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1293 ((c) > 255 ? 255 : (c)))'; \ 1294 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1295 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1296 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1297endef 1298 1299$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1300$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1301$(version_h): FORCE 1302 $(call filechk,version.h) 1303 1304include/generated/utsrelease.h: include/config/kernel.release FORCE 1305 $(call filechk,utsrelease.h) 1306 1307PHONY += headerdep 1308headerdep: 1309 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1310 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1311 1312# --------------------------------------------------------------------------- 1313# Kernel headers 1314 1315#Default location for installed headers 1316export INSTALL_HDR_PATH = $(objtree)/usr 1317 1318quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1319 cmd_headers_install = \ 1320 mkdir -p $(INSTALL_HDR_PATH); \ 1321 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1322 usr/include $(INSTALL_HDR_PATH) 1323 1324PHONY += headers_install 1325headers_install: headers 1326 $(call cmd,headers_install) 1327 1328PHONY += archheaders archscripts 1329 1330hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1331 1332PHONY += headers 1333headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1334 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1335 $(error Headers not exportable for the $(SRCARCH) architecture)) 1336 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1337 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1338 1339# Deprecated. It is no-op now. 1340PHONY += headers_check 1341headers_check: 1342 @: 1343 1344ifdef CONFIG_HEADERS_INSTALL 1345prepare: headers 1346endif 1347 1348PHONY += scripts_unifdef 1349scripts_unifdef: scripts_basic 1350 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1351 1352# --------------------------------------------------------------------------- 1353# Kernel selftest 1354 1355PHONY += kselftest 1356kselftest: 1357 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1358 1359kselftest-%: FORCE 1360 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1361 1362PHONY += kselftest-merge 1363kselftest-merge: 1364 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1365 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1366 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1367 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1368 1369# --------------------------------------------------------------------------- 1370# Devicetree files 1371 1372ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1373dtstree := arch/$(SRCARCH)/boot/dts 1374endif 1375 1376ifneq ($(dtstree),) 1377 1378%.dtb: include/config/kernel.release scripts_dtc 1379 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1380 1381%.dtbo: include/config/kernel.release scripts_dtc 1382 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1383 1384PHONY += dtbs dtbs_install dtbs_check 1385dtbs: include/config/kernel.release scripts_dtc 1386 $(Q)$(MAKE) $(build)=$(dtstree) 1387 1388ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1389export CHECK_DTBS=y 1390dtbs: dt_binding_check 1391endif 1392 1393dtbs_check: dtbs 1394 1395dtbs_install: 1396 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1397 1398ifdef CONFIG_OF_EARLY_FLATTREE 1399all: dtbs 1400endif 1401 1402endif 1403 1404PHONY += scripts_dtc 1405scripts_dtc: scripts_basic 1406 $(Q)$(MAKE) $(build)=scripts/dtc 1407 1408ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1409export CHECK_DT_BINDING=y 1410endif 1411 1412PHONY += dt_binding_check 1413dt_binding_check: scripts_dtc 1414 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1415 1416# --------------------------------------------------------------------------- 1417# Modules 1418 1419ifdef CONFIG_MODULES 1420 1421# By default, build modules as well 1422 1423all: modules 1424 1425# When we're building modules with modversions, we need to consider 1426# the built-in objects during the descend as well, in order to 1427# make sure the checksums are up to date before we record them. 1428ifdef CONFIG_MODVERSIONS 1429 KBUILD_BUILTIN := 1 1430endif 1431 1432# Build modules 1433# 1434# A module can be listed more than once in obj-m resulting in 1435# duplicate lines in modules.order files. Those are removed 1436# using awk while concatenating to the final file. 1437 1438PHONY += modules 1439modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1440 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1441 1442PHONY += modules_check 1443modules_check: modules.order 1444 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1445 1446cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1447 1448modules.order: $(subdir-modorder) FORCE 1449 $(call if_changed,modules_order) 1450 1451targets += modules.order 1452 1453# Target to prepare building external modules 1454PHONY += modules_prepare 1455modules_prepare: prepare 1456 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1457 1458# Target to install modules 1459PHONY += modules_install 1460modules_install: _modinst_ _modinst_post 1461 1462PHONY += _modinst_ 1463_modinst_: 1464 @rm -rf $(MODLIB)/kernel 1465 @rm -f $(MODLIB)/source 1466 @mkdir -p $(MODLIB)/kernel 1467 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1468 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1469 rm -f $(MODLIB)/build ; \ 1470 ln -s $(CURDIR) $(MODLIB)/build ; \ 1471 fi 1472 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1473 @cp -f modules.builtin $(MODLIB)/ 1474 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1476 1477# This depmod is only for convenience to give the initial 1478# boot a modules.dep even before / is mounted read-write. However the 1479# boot script depmod is the master version. 1480PHONY += _modinst_post 1481_modinst_post: _modinst_ 1482 $(call cmd,depmod) 1483 1484ifeq ($(CONFIG_MODULE_SIG), y) 1485PHONY += modules_sign 1486modules_sign: 1487 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1488endif 1489 1490else # CONFIG_MODULES 1491 1492# Modules not configured 1493# --------------------------------------------------------------------------- 1494 1495PHONY += modules modules_install 1496modules modules_install: 1497 @echo >&2 1498 @echo >&2 "The present kernel configuration has modules disabled." 1499 @echo >&2 "Type 'make config' and enable loadable module support." 1500 @echo >&2 "Then build a kernel with module support enabled." 1501 @echo >&2 1502 @exit 1 1503 1504endif # CONFIG_MODULES 1505 1506### 1507# Cleaning is done on three levels. 1508# make clean Delete most generated files 1509# Leave enough to build external modules 1510# make mrproper Delete the current configuration, and all generated files 1511# make distclean Remove editor backup files, patch leftover files and the like 1512 1513# Directories & files removed with 'make clean' 1514CLEAN_FILES += include/ksym vmlinux.symvers \ 1515 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1516 compile_commands.json .thinlto-cache 1517 1518# Directories & files removed with 'make mrproper' 1519MRPROPER_FILES += include/config include/generated \ 1520 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1521 debian snap tar-install \ 1522 .config .config.old .version \ 1523 Module.symvers \ 1524 signing_key.pem signing_key.priv signing_key.x509 \ 1525 x509.genkey extra_certificates signing_key.x509.keyid \ 1526 signing_key.x509.signer vmlinux-gdb.py \ 1527 *.spec 1528 1529# Directories & files removed with 'make distclean' 1530DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1531 1532# clean - Delete most, but leave enough to build external modules 1533# 1534clean: rm-files := $(CLEAN_FILES) 1535 1536PHONY += archclean vmlinuxclean 1537 1538vmlinuxclean: 1539 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1540 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1541 1542clean: archclean vmlinuxclean resolve_btfids_clean 1543 1544# mrproper - Delete all generated files, including .config 1545# 1546mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1547mrproper-dirs := $(addprefix _mrproper_,scripts) 1548 1549PHONY += $(mrproper-dirs) mrproper 1550$(mrproper-dirs): 1551 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1552 1553mrproper: clean $(mrproper-dirs) 1554 $(call cmd,rmfiles) 1555 1556# distclean 1557# 1558distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1559 1560PHONY += distclean 1561 1562distclean: mrproper 1563 $(call cmd,rmfiles) 1564 @find $(srctree) $(RCS_FIND_IGNORE) \ 1565 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1566 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1567 -o -name 'core' \) \ 1568 -type f -print | xargs rm -f 1569 1570 1571# Packaging of the kernel to various formats 1572# --------------------------------------------------------------------------- 1573 1574%src-pkg: FORCE 1575 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1576%pkg: include/config/kernel.release FORCE 1577 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1578 1579# Brief documentation of the typical targets used 1580# --------------------------------------------------------------------------- 1581 1582boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1583boards := $(sort $(notdir $(boards))) 1584board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1585board-dirs := $(sort $(notdir $(board-dirs:/=))) 1586 1587PHONY += help 1588help: 1589 @echo 'Cleaning targets:' 1590 @echo ' clean - Remove most generated files but keep the config and' 1591 @echo ' enough build support to build external modules' 1592 @echo ' mrproper - Remove all generated files + config + various backup files' 1593 @echo ' distclean - mrproper + remove editor backup and patch files' 1594 @echo '' 1595 @echo 'Configuration targets:' 1596 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1597 @echo '' 1598 @echo 'Other generic targets:' 1599 @echo ' all - Build all targets marked with [*]' 1600 @echo '* vmlinux - Build the bare kernel' 1601 @echo '* modules - Build all modules' 1602 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1603 @echo ' dir/ - Build all files in dir and below' 1604 @echo ' dir/file.[ois] - Build specified target only' 1605 @echo ' dir/file.ll - Build the LLVM assembly file' 1606 @echo ' (requires compiler support for LLVM assembly generation)' 1607 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1608 @echo ' (requires a recent binutils and recent build (System.map))' 1609 @echo ' dir/file.ko - Build module including final link' 1610 @echo ' modules_prepare - Set up for building external modules' 1611 @echo ' tags/TAGS - Generate tags file for editors' 1612 @echo ' cscope - Generate cscope index' 1613 @echo ' gtags - Generate GNU GLOBAL index' 1614 @echo ' kernelrelease - Output the release version string (use with make -s)' 1615 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1616 @echo ' image_name - Output the image name (use with make -s)' 1617 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1618 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1619 echo '' 1620 @echo 'Static analysers:' 1621 @echo ' checkstack - Generate a list of stack hogs' 1622 @echo ' versioncheck - Sanity check on version.h usage' 1623 @echo ' includecheck - Check for duplicate included header files' 1624 @echo ' export_report - List the usages of all exported symbols' 1625 @echo ' headerdep - Detect inclusion cycles in headers' 1626 @echo ' coccicheck - Check with Coccinelle' 1627 @echo ' clang-analyzer - Check with clang static analyzer' 1628 @echo ' clang-tidy - Check with clang-tidy' 1629 @echo '' 1630 @echo 'Tools:' 1631 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1632 @echo '' 1633 @echo 'Kernel selftest:' 1634 @echo ' kselftest - Build and run kernel selftest' 1635 @echo ' Build, install, and boot kernel before' 1636 @echo ' running kselftest on it' 1637 @echo ' Run as root for full coverage' 1638 @echo ' kselftest-all - Build kernel selftest' 1639 @echo ' kselftest-install - Build and install kernel selftest' 1640 @echo ' kselftest-clean - Remove all generated kselftest files' 1641 @echo ' kselftest-merge - Merge all the config dependencies of' 1642 @echo ' kselftest to existing .config.' 1643 @echo '' 1644 @$(if $(dtstree), \ 1645 echo 'Devicetree:'; \ 1646 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1647 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1648 echo ' dt_binding_check - Validate device tree binding documents'; \ 1649 echo ' dtbs_check - Validate device tree source files';\ 1650 echo '') 1651 1652 @echo 'Userspace tools targets:' 1653 @echo ' use "make tools/help"' 1654 @echo ' or "cd tools; make help"' 1655 @echo '' 1656 @echo 'Kernel packaging:' 1657 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1658 @echo '' 1659 @echo 'Documentation targets:' 1660 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1661 @echo '' 1662 @echo 'Architecture specific targets ($(SRCARCH)):' 1663 @$(if $(archhelp),$(archhelp),\ 1664 echo ' No architecture specific help defined for $(SRCARCH)') 1665 @echo '' 1666 @$(if $(boards), \ 1667 $(foreach b, $(boards), \ 1668 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1669 echo '') 1670 @$(if $(board-dirs), \ 1671 $(foreach b, $(board-dirs), \ 1672 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1673 printf " %-16s - Show all of the above\\n" help-boards; \ 1674 echo '') 1675 1676 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1677 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1678 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1679 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1680 @echo ' (sparse by default)' 1681 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1682 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1683 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1684 @echo ' 1: warnings which may be relevant and do not occur too often' 1685 @echo ' 2: warnings which occur quite often but may still be relevant' 1686 @echo ' 3: more obscure warnings, can most likely be ignored' 1687 @echo ' Multiple levels can be combined with W=12 or W=123' 1688 @echo '' 1689 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1690 @echo 'For further info see the ./README file' 1691 1692 1693help-board-dirs := $(addprefix help-,$(board-dirs)) 1694 1695help-boards: $(help-board-dirs) 1696 1697boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1698 1699$(help-board-dirs): help-%: 1700 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1701 @$(if $(boards-per-dir), \ 1702 $(foreach b, $(boards-per-dir), \ 1703 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1704 echo '') 1705 1706 1707# Documentation targets 1708# --------------------------------------------------------------------------- 1709DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1710 linkcheckdocs dochelp refcheckdocs 1711PHONY += $(DOC_TARGETS) 1712$(DOC_TARGETS): 1713 $(Q)$(MAKE) $(build)=Documentation $@ 1714 1715# Misc 1716# --------------------------------------------------------------------------- 1717 1718PHONY += scripts_gdb 1719scripts_gdb: prepare0 1720 $(Q)$(MAKE) $(build)=scripts/gdb 1721 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1722 1723ifdef CONFIG_GDB_SCRIPTS 1724all: scripts_gdb 1725endif 1726 1727else # KBUILD_EXTMOD 1728 1729### 1730# External module support. 1731# When building external modules the kernel used as basis is considered 1732# read-only, and no consistency checks are made and the make 1733# system is not used on the basis kernel. If updates are required 1734# in the basis kernel ordinary make commands (without M=...) must 1735# be used. 1736# 1737# The following are the only valid targets when building external 1738# modules. 1739# make M=dir clean Delete all automatically generated files 1740# make M=dir modules Make all modules in specified dir 1741# make M=dir Same as 'make M=dir modules' 1742# make M=dir modules_install 1743# Install the modules built in the module directory 1744# Assumes install directory is already created 1745 1746# We are always building only modules. 1747KBUILD_BUILTIN := 1748KBUILD_MODULES := 1 1749 1750build-dirs := $(KBUILD_EXTMOD) 1751PHONY += modules 1752modules: $(MODORDER) 1753 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1754 1755$(MODORDER): descend 1756 @: 1757 1758PHONY += modules_install 1759modules_install: _emodinst_ _emodinst_post 1760 1761install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1762PHONY += _emodinst_ 1763_emodinst_: 1764 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1766 1767PHONY += _emodinst_post 1768_emodinst_post: _emodinst_ 1769 $(call cmd,depmod) 1770 1771compile_commands.json: $(extmod-prefix)compile_commands.json 1772PHONY += compile_commands.json 1773 1774clean-dirs := $(KBUILD_EXTMOD) 1775clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1776 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1777 1778PHONY += help 1779help: 1780 @echo ' Building external modules.' 1781 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1782 @echo '' 1783 @echo ' modules - default target, build the module(s)' 1784 @echo ' modules_install - install the module' 1785 @echo ' clean - remove generated files in module directory only' 1786 @echo '' 1787 1788# no-op for external module builds 1789PHONY += prepare modules_prepare 1790 1791endif # KBUILD_EXTMOD 1792 1793# Single targets 1794# --------------------------------------------------------------------------- 1795# To build individual files in subdirectories, you can do like this: 1796# 1797# make foo/bar/baz.s 1798# 1799# The supported suffixes for single-target are listed in 'single-targets' 1800# 1801# To build only under specific subdirectories, you can do like this: 1802# 1803# make foo/bar/baz/ 1804 1805ifdef single-build 1806 1807# .ko is special because modpost is needed 1808single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1809single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1810 1811$(single-ko): single_modpost 1812 @: 1813$(single-no-ko): descend 1814 @: 1815 1816ifeq ($(KBUILD_EXTMOD),) 1817# For the single build of in-tree modules, use a temporary file to avoid 1818# the situation of modules_install installing an invalid modules.order. 1819MODORDER := .modules.tmp 1820endif 1821 1822PHONY += single_modpost 1823single_modpost: $(single-no-ko) modules_prepare 1824 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1825 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1826 1827KBUILD_MODULES := 1 1828 1829export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1830 1831# trim unrelated directories 1832build-dirs := $(foreach d, $(build-dirs), \ 1833 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1834 1835endif 1836 1837ifndef CONFIG_MODULES 1838KBUILD_MODULES := 1839endif 1840 1841# Handle descending into subdirectories listed in $(build-dirs) 1842# Preset locale variables to speed up the build process. Limit locale 1843# tweaks to this spot to avoid wrong language settings when running 1844# make menuconfig etc. 1845# Error messages still appears in the original language 1846PHONY += descend $(build-dirs) 1847descend: $(build-dirs) 1848$(build-dirs): prepare 1849 $(Q)$(MAKE) $(build)=$@ \ 1850 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1851 need-builtin=1 need-modorder=1 1852 1853clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1854PHONY += $(clean-dirs) clean 1855$(clean-dirs): 1856 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1857 1858clean: $(clean-dirs) 1859 $(call cmd,rmfiles) 1860 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1861 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1862 -o -name '*.ko.*' \ 1863 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1864 -o -name '*.dwo' -o -name '*.lst' \ 1865 -o -name '*.su' -o -name '*.mod' \ 1866 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1867 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1868 -o -name '*.asn1.[ch]' \ 1869 -o -name '*.symtypes' -o -name 'modules.order' \ 1870 -o -name '.tmp_*.o.*' \ 1871 -o -name '*.c.[012]*.*' \ 1872 -o -name '*.ll' \ 1873 -o -name '*.gcno' \ 1874 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1875 1876# Generate tags for editors 1877# --------------------------------------------------------------------------- 1878quiet_cmd_tags = GEN $@ 1879 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1880 1881tags TAGS cscope gtags: FORCE 1882 $(call cmd,tags) 1883 1884# Script to generate missing namespace dependencies 1885# --------------------------------------------------------------------------- 1886 1887PHONY += nsdeps 1888nsdeps: export KBUILD_NSDEPS=1 1889nsdeps: modules 1890 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1891 1892# Clang Tooling 1893# --------------------------------------------------------------------------- 1894 1895quiet_cmd_gen_compile_commands = GEN $@ 1896 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1897 1898$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1899 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1900 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1901 $(call if_changed,gen_compile_commands) 1902 1903targets += $(extmod-prefix)compile_commands.json 1904 1905PHONY += clang-tidy clang-analyzer 1906 1907ifdef CONFIG_CC_IS_CLANG 1908quiet_cmd_clang_tools = CHECK $< 1909 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1910 1911clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1912 $(call cmd,clang_tools) 1913else 1914clang-tidy clang-analyzer: 1915 @echo "$@ requires CC=clang" >&2 1916 @false 1917endif 1918 1919# Scripts to check various things for consistency 1920# --------------------------------------------------------------------------- 1921 1922PHONY += includecheck versioncheck coccicheck export_report 1923 1924includecheck: 1925 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1926 -name '*.[hcS]' -type f -print | sort \ 1927 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1928 1929versioncheck: 1930 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1931 -name '*.[hcS]' -type f -print | sort \ 1932 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1933 1934coccicheck: 1935 $(Q)$(BASH) $(srctree)/scripts/$@ 1936 1937export_report: 1938 $(PERL) $(srctree)/scripts/export_report.pl 1939 1940PHONY += checkstack kernelrelease kernelversion image_name 1941 1942# UML needs a little special treatment here. It wants to use the host 1943# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1944# else wants $(ARCH), including people doing cross-builds, which means 1945# that $(SUBARCH) doesn't work here. 1946ifeq ($(ARCH), um) 1947CHECKSTACK_ARCH := $(SUBARCH) 1948else 1949CHECKSTACK_ARCH := $(ARCH) 1950endif 1951checkstack: 1952 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1953 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1954 1955kernelrelease: 1956 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1957 1958kernelversion: 1959 @echo $(KERNELVERSION) 1960 1961image_name: 1962 @echo $(KBUILD_IMAGE) 1963 1964# Clear a bunch of variables before executing the submake 1965 1966ifeq ($(quiet),silent_) 1967tools_silent=s 1968endif 1969 1970tools/: FORCE 1971 $(Q)mkdir -p $(objtree)/tools 1972 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1973 1974tools/%: FORCE 1975 $(Q)mkdir -p $(objtree)/tools 1976 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1977 1978quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1979 cmd_rmfiles = rm -rf $(rm-files) 1980 1981# Run depmod only if we have System.map and depmod is executable 1982quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1983 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1984 $(KERNELRELEASE) 1985 1986# read saved command lines for existing targets 1987existing-targets := $(wildcard $(sort $(targets))) 1988 1989-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1990 1991endif # config-build 1992endif # mixed-build 1993endif # need-sub-make 1994 1995PHONY += FORCE 1996FORCE: 1997 1998# Declare the contents of the PHONY variable as phony. We keep that 1999# information in a variable so we can use it in if_changed and friends. 2000.PHONY: $(PHONY) 2001