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 := $(no-dot-config-targets) %install kernelrelease \ 268 image_name 269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271config-build := 272mixed-build := 273need-config := 1 274may-sync-config := 1 275single-build := 276 277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281endif 282 283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287endif 288 289ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291endif 292 293ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300endif 301 302# We cannot build single targets and the others at the same time 303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# For "make -j clean all", "make -j mrproper defconfig all", etc. 311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# install and modules_install need also be processed one by one 318ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324ifdef mixed-build 325# =========================================================================== 326# We're called with mixed targets (*config and build targets). 327# Handle them one by one. 328 329PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331$(MAKECMDGOALS): __build_one_by_one 332 @: 333 334__build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340else # !mixed-build 341 342include scripts/Kbuild.include 343 344# Read KERNELRELEASE from include/config/kernel.release (if it exists) 345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349include scripts/subarch.include 350 351# Cross compiling and selecting different set of gcc/bin-utils 352# --------------------------------------------------------------------------- 353# 354# When performing cross compilation for other architectures ARCH shall be set 355# to the target architecture. (See arch/* for the possibilities). 356# ARCH can be set during invocation of make: 357# make ARCH=ia64 358# Another way is to have ARCH set in the environment. 359# The default ARCH is the host where make is executed. 360 361# CROSS_COMPILE specify the prefix used for all executables used 362# during compilation. Only gcc and related bin-utils executables 363# are prefixed with $(CROSS_COMPILE). 364# CROSS_COMPILE can be set on the command line 365# make CROSS_COMPILE=ia64-linux- 366# Alternatively CROSS_COMPILE can be set in the environment. 367# Default value for CROSS_COMPILE is not to prefix executables 368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369ARCH ?= $(SUBARCH) 370 371# Architecture as present in compile.h 372UTS_MACHINE := $(ARCH) 373SRCARCH := $(ARCH) 374 375# Additional ARCH settings for x86 376ifeq ($(ARCH),i386) 377 SRCARCH := x86 378endif 379ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381endif 382 383# Additional ARCH settings for sparc 384ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386endif 387ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389endif 390 391# Additional ARCH settings for sh 392ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394endif 395 396KCONFIG_CONFIG ?= .config 397export KCONFIG_CONFIG 398 399# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 400export KBUILD_DEFCONFIG := defconfig 401 402# SHELL used by kbuild 403CONFIG_SHELL := sh 404 405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 408 409ifneq ($(LLVM),) 410HOSTCC = clang 411HOSTCXX = clang++ 412else 413HOSTCC = gcc 414HOSTCXX = g++ 415endif 416 417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 418 -O2 -fomit-frame-pointer -std=gnu89 419export KBUILD_USERLDFLAGS := 420 421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 425 426# Make variables (CC, etc...) 427CPP = $(CC) -E 428ifneq ($(LLVM),) 429CC = clang 430LD = ld.lld 431AR = llvm-ar 432NM = llvm-nm 433OBJCOPY = llvm-objcopy 434OBJDUMP = llvm-objdump 435READELF = llvm-readelf 436STRIP = llvm-strip 437else 438CC = $(CROSS_COMPILE)gcc 439LD = $(CROSS_COMPILE)ld 440AR = $(CROSS_COMPILE)ar 441NM = $(CROSS_COMPILE)nm 442OBJCOPY = $(CROSS_COMPILE)objcopy 443OBJDUMP = $(CROSS_COMPILE)objdump 444READELF = $(CROSS_COMPILE)readelf 445STRIP = $(CROSS_COMPILE)strip 446endif 447PAHOLE = pahole 448RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 449LEX = flex 450YACC = bison 451AWK = awk 452INSTALLKERNEL := installkernel 453DEPMOD = depmod 454PERL = perl 455PYTHON3 = python3 456CHECK = sparse 457BASH = bash 458KGZIP = gzip 459KBZIP2 = bzip2 460KLZOP = lzop 461LZMA = lzma 462LZ4 = lz4c 463XZ = xz 464ZSTD = zstd 465 466CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 467 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 468NOSTDINC_FLAGS := 469CFLAGS_MODULE = 470AFLAGS_MODULE = 471LDFLAGS_MODULE = 472CFLAGS_KERNEL = 473AFLAGS_KERNEL = 474LDFLAGS_vmlinux = 475 476# Use USERINCLUDE when you must reference the UAPI directories only. 477USERINCLUDE := \ 478 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 479 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 480 -I$(srctree)/include/uapi \ 481 -I$(objtree)/include/generated/uapi \ 482 -include $(srctree)/include/linux/kconfig.h 483 484# Use LINUXINCLUDE when you must reference the include/ directory. 485# Needed to be compatible with the O= option 486LINUXINCLUDE := \ 487 -I$(srctree)/arch/$(SRCARCH)/include \ 488 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 489 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 490 -I$(objtree)/include \ 491 $(USERINCLUDE) 492 493KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 494KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 495 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 496 -Werror=implicit-function-declaration -Werror=implicit-int \ 497 -Werror=return-type -Wno-format-security \ 498 -std=gnu89 499KBUILD_CPPFLAGS := -D__KERNEL__ 500KBUILD_AFLAGS_KERNEL := 501KBUILD_CFLAGS_KERNEL := 502KBUILD_AFLAGS_MODULE := -DMODULE 503KBUILD_CFLAGS_MODULE := -DMODULE 504KBUILD_LDFLAGS_MODULE := 505KBUILD_LDFLAGS := 506CLANG_FLAGS := 507 508export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 509export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 510export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 511export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 512export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 513 514export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 515export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 516export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 517export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 518export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 519 520# Files to ignore in find ... statements 521 522export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 523 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 524 -prune -o 525export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 526 --exclude CVS --exclude .pc --exclude .hg --exclude .git 527 528# =========================================================================== 529# Rules shared between *config targets and build targets 530 531# Basic helpers built in scripts/basic/ 532PHONY += scripts_basic 533scripts_basic: 534 $(Q)$(MAKE) $(build)=scripts/basic 535 $(Q)rm -f .tmp_quiet_recordmcount 536 537PHONY += outputmakefile 538# Before starting out-of-tree build, make sure the source tree is clean. 539# outputmakefile generates a Makefile in the output directory, if using a 540# separate output directory. This allows convenient use of make in the 541# output directory. 542# At the same time when output Makefile generated, generate .gitignore to 543# ignore whole output directory 544outputmakefile: 545ifdef building_out_of_srctree 546 $(Q)if [ -f $(srctree)/.config -o \ 547 -d $(srctree)/include/config -o \ 548 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 549 echo >&2 "***"; \ 550 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 551 echo >&2 "*** in $(abs_srctree)";\ 552 echo >&2 "***"; \ 553 false; \ 554 fi 555 $(Q)ln -fsn $(srctree) source 556 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 557 $(Q)test -e .gitignore || \ 558 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 559endif 560 561# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 562# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 563# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 564# and from include/config/auto.conf.cmd to detect the compiler upgrade. 565CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g') 566 567ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 568ifneq ($(CROSS_COMPILE),) 569CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 570GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 571CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 572GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 573endif 574ifneq ($(GCC_TOOLCHAIN),) 575CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 576endif 577ifneq ($(LLVM_IAS),1) 578CLANG_FLAGS += -no-integrated-as 579endif 580CLANG_FLAGS += -Werror=unknown-warning-option 581KBUILD_CFLAGS += $(CLANG_FLAGS) 582KBUILD_AFLAGS += $(CLANG_FLAGS) 583export CLANG_FLAGS 584endif 585 586ifdef config-build 587# =========================================================================== 588# *config targets only - make sure prerequisites are updated, and descend 589# in scripts/kconfig to make the *config target 590 591# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 592# KBUILD_DEFCONFIG may point out an alternative default configuration 593# used for 'make defconfig' 594include arch/$(SRCARCH)/Makefile 595export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 596 597config: outputmakefile scripts_basic FORCE 598 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 599 600%config: outputmakefile scripts_basic FORCE 601 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 602 603else #!config-build 604# =========================================================================== 605# Build targets only - this includes vmlinux, arch specific targets, clean 606# targets and others. In general all targets except *config targets. 607 608# If building an external module we do not care about the all: rule 609# but instead __all depend on modules 610PHONY += all 611ifeq ($(KBUILD_EXTMOD),) 612__all: all 613else 614__all: modules 615endif 616 617# Decide whether to build built-in, modular, or both. 618# Normally, just do built-in. 619 620KBUILD_MODULES := 621KBUILD_BUILTIN := 1 622 623# If we have only "make modules", don't compile built-in objects. 624ifeq ($(MAKECMDGOALS),modules) 625 KBUILD_BUILTIN := 626endif 627 628# If we have "make <whatever> modules", compile modules 629# in addition to whatever we do anyway. 630# Just "make" or "make all" shall build modules as well 631 632ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 633 KBUILD_MODULES := 1 634endif 635 636ifeq ($(MAKECMDGOALS),) 637 KBUILD_MODULES := 1 638endif 639 640export KBUILD_MODULES KBUILD_BUILTIN 641 642ifdef need-config 643include include/config/auto.conf 644endif 645 646ifeq ($(KBUILD_EXTMOD),) 647# Objects we will link into vmlinux / subdirs we need to visit 648core-y := init/ usr/ 649drivers-y := drivers/ sound/ 650drivers-$(CONFIG_SAMPLES) += samples/ 651drivers-$(CONFIG_NET) += net/ 652drivers-y += virt/ 653libs-y := lib/ 654endif # KBUILD_EXTMOD 655 656# The all: target is the default when no target is given on the 657# command line. 658# This allow a user to issue only 'make' to build a kernel including modules 659# Defaults to vmlinux, but the arch makefile usually adds further targets 660all: vmlinux 661 662CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 663 $(call cc-option,-fno-tree-loop-im) \ 664 $(call cc-disable-warning,maybe-uninitialized,) 665export CFLAGS_GCOV 666 667# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 668ifdef CONFIG_FUNCTION_TRACER 669 CC_FLAGS_FTRACE := -pg 670endif 671 672RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 673RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 674RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 675RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 676RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 677RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 678export RETPOLINE_CFLAGS 679export RETPOLINE_VDSO_CFLAGS 680 681include arch/$(SRCARCH)/Makefile 682 683ifdef need-config 684ifdef may-sync-config 685# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 686# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 687# because some architectures define CROSS_COMPILE there. 688include include/config/auto.conf.cmd 689 690$(KCONFIG_CONFIG): 691 @echo >&2 '***' 692 @echo >&2 '*** Configuration file "$@" not found!' 693 @echo >&2 '***' 694 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 695 @echo >&2 '*** "make menuconfig" or "make xconfig").' 696 @echo >&2 '***' 697 @/bin/false 698 699# The actual configuration files used during the build are stored in 700# include/generated/ and include/config/. Update them if .config is newer than 701# include/config/auto.conf (which mirrors .config). 702# 703# This exploits the 'multi-target pattern rule' trick. 704# The syncconfig should be executed only once to make all the targets. 705# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 706quiet_cmd_syncconfig = SYNC $@ 707 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 708 709%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 710 +$(call cmd,syncconfig) 711else # !may-sync-config 712# External modules and some install targets need include/generated/autoconf.h 713# and include/config/auto.conf but do not care if they are up-to-date. 714# Use auto.conf to trigger the test 715PHONY += include/config/auto.conf 716 717include/config/auto.conf: 718 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 719 echo >&2; \ 720 echo >&2 " ERROR: Kernel configuration is invalid."; \ 721 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 722 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 723 echo >&2 ; \ 724 /bin/false) 725 726endif # may-sync-config 727endif # need-config 728 729KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 730KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 731KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 732KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 733KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 734 735ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 736KBUILD_CFLAGS += -O2 737else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 738KBUILD_CFLAGS += -O3 739else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 740KBUILD_CFLAGS += -Os 741endif 742 743# Tell gcc to never replace conditional load with a non-conditional one 744KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 745KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 746 747ifdef CONFIG_READABLE_ASM 748# Disable optimizations that make assembler listings hard to read. 749# reorder blocks reorders the control in the function 750# ipa clone creates specialized cloned functions 751# partial inlining inlines only parts of functions 752KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 753 $(call cc-option,-fno-ipa-cp-clone,) \ 754 $(call cc-option,-fno-partial-inlining) 755endif 756 757ifneq ($(CONFIG_FRAME_WARN),0) 758KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 759endif 760 761stackp-flags-y := -fno-stack-protector 762stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 763stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 764 765KBUILD_CFLAGS += $(stackp-flags-y) 766 767ifdef CONFIG_CC_IS_CLANG 768KBUILD_CPPFLAGS += -Qunused-arguments 769KBUILD_CFLAGS += -Wno-format-invalid-specifier 770KBUILD_CFLAGS += -Wno-gnu 771# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 772# source of a reference will be _MergedGlobals and not on of the whitelisted names. 773# See modpost pattern 2 774KBUILD_CFLAGS += -mno-global-merge 775else 776 777# These warnings generated too much noise in a regular build. 778# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 779KBUILD_CFLAGS += -Wno-unused-but-set-variable 780 781# Warn about unmarked fall-throughs in switch statement. 782# Disabled for clang while comment to attribute conversion happens and 783# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 784KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 785endif 786 787KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 788ifdef CONFIG_FRAME_POINTER 789KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 790else 791# Some targets (ARM with Thumb2, for example), can't be built with frame 792# pointers. For those, we don't have FUNCTION_TRACER automatically 793# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 794# incompatible with -fomit-frame-pointer with current GCC, so we don't use 795# -fomit-frame-pointer with FUNCTION_TRACER. 796ifndef CONFIG_FUNCTION_TRACER 797KBUILD_CFLAGS += -fomit-frame-pointer 798endif 799endif 800 801# Initialize all stack variables with a 0xAA pattern. 802ifdef CONFIG_INIT_STACK_ALL_PATTERN 803KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 804endif 805 806# Initialize all stack variables with a zero value. 807ifdef CONFIG_INIT_STACK_ALL_ZERO 808# Future support for zero initialization is still being debated, see 809# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 810# renamed or dropped. 811KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 812KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 813endif 814 815DEBUG_CFLAGS := 816 817# Workaround for GCC versions < 5.0 818# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 819ifdef CONFIG_CC_IS_GCC 820DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 821endif 822 823ifdef CONFIG_DEBUG_INFO 824 825ifdef CONFIG_DEBUG_INFO_SPLIT 826DEBUG_CFLAGS += -gsplit-dwarf 827else 828DEBUG_CFLAGS += -g 829endif 830 831ifneq ($(LLVM_IAS),1) 832KBUILD_AFLAGS += -Wa,-gdwarf-2 833endif 834 835ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 836dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 837dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 838DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 839endif 840 841ifdef CONFIG_DEBUG_INFO_REDUCED 842DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 843 $(call cc-option,-fno-var-tracking) 844endif 845 846ifdef CONFIG_DEBUG_INFO_COMPRESSED 847DEBUG_CFLAGS += -gz=zlib 848KBUILD_AFLAGS += -gz=zlib 849KBUILD_LDFLAGS += --compress-debug-sections=zlib 850endif 851 852endif # CONFIG_DEBUG_INFO 853 854KBUILD_CFLAGS += $(DEBUG_CFLAGS) 855export DEBUG_CFLAGS 856 857ifdef CONFIG_FUNCTION_TRACER 858ifdef CONFIG_FTRACE_MCOUNT_USE_CC 859 CC_FLAGS_FTRACE += -mrecord-mcount 860 ifdef CONFIG_HAVE_NOP_MCOUNT 861 ifeq ($(call cc-option-yn, -mnop-mcount),y) 862 CC_FLAGS_FTRACE += -mnop-mcount 863 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 864 endif 865 endif 866endif 867ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 868 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 869endif 870ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 871 ifdef CONFIG_HAVE_C_RECORDMCOUNT 872 BUILD_C_RECORDMCOUNT := y 873 export BUILD_C_RECORDMCOUNT 874 endif 875endif 876ifdef CONFIG_HAVE_FENTRY 877 ifeq ($(call cc-option-yn, -mfentry),y) 878 CC_FLAGS_FTRACE += -mfentry 879 CC_FLAGS_USING += -DCC_USING_FENTRY 880 endif 881endif 882export CC_FLAGS_FTRACE 883KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 884KBUILD_AFLAGS += $(CC_FLAGS_USING) 885endif 886 887# We trigger additional mismatches with less inlining 888ifdef CONFIG_DEBUG_SECTION_MISMATCH 889KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 890endif 891 892ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 893KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 894LDFLAGS_vmlinux += --gc-sections 895endif 896 897ifdef CONFIG_SHADOW_CALL_STACK 898CC_FLAGS_SCS := -fsanitize=shadow-call-stack 899KBUILD_CFLAGS += $(CC_FLAGS_SCS) 900export CC_FLAGS_SCS 901endif 902 903ifdef CONFIG_LTO_CLANG 904ifdef CONFIG_LTO_CLANG_THIN 905CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 906KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 907else 908CC_FLAGS_LTO := -flto 909endif 910CC_FLAGS_LTO += -fvisibility=hidden 911 912# Limit inlining across translation units to reduce binary size 913KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 914endif 915 916ifdef CONFIG_LTO 917KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 918KBUILD_AFLAGS += -fno-lto 919export CC_FLAGS_LTO 920endif 921 922ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 923KBUILD_CFLAGS += -falign-functions=32 924endif 925 926# arch Makefile may override CC so keep this after arch Makefile is included 927NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 928 929# warn about C99 declaration after statement 930KBUILD_CFLAGS += -Wdeclaration-after-statement 931 932# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 933KBUILD_CFLAGS += -Wvla 934 935# disable pointer signed / unsigned warnings in gcc 4.0 936KBUILD_CFLAGS += -Wno-pointer-sign 937 938# disable stringop warnings in gcc 8+ 939KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 940 941# We'll want to enable this eventually, but it's not going away for 5.7 at least 942KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 943KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 944KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 945 946# Another good warning that we'll want to enable eventually 947KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 948 949# Enabled with W=2, disabled by default as noisy 950KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 951 952# disable invalid "can't wrap" optimizations for signed / pointers 953KBUILD_CFLAGS += -fno-strict-overflow 954 955# Make sure -fstack-check isn't enabled (like gentoo apparently did) 956KBUILD_CFLAGS += -fno-stack-check 957 958# conserve stack if available 959KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 960 961# Prohibit date/time macros, which would make the build non-deterministic 962KBUILD_CFLAGS += -Werror=date-time 963 964# enforce correct pointer usage 965KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 966 967# Require designated initializers for all marked structures 968KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 969 970# change __FILE__ to the relative path from the srctree 971KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 972 973# include additional Makefiles when needed 974include-y := scripts/Makefile.extrawarn 975include-$(CONFIG_KASAN) += scripts/Makefile.kasan 976include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 977include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 978include-$(CONFIG_KCOV) += scripts/Makefile.kcov 979include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 980 981include $(addprefix $(srctree)/, $(include-y)) 982 983# scripts/Makefile.gcc-plugins is intentionally included last. 984# Do not add $(call cc-option,...) below this line. When you build the kernel 985# from the clean source tree, the GCC plugins do not exist at this point. 986 987# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 988KBUILD_CPPFLAGS += $(KCPPFLAGS) 989KBUILD_AFLAGS += $(KAFLAGS) 990KBUILD_CFLAGS += $(KCFLAGS) 991 992KBUILD_LDFLAGS_MODULE += --build-id=sha1 993LDFLAGS_vmlinux += --build-id=sha1 994 995ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 996LDFLAGS_vmlinux += $(call ld-option, -X,) 997endif 998 999ifeq ($(CONFIG_RELR),y) 1000LDFLAGS_vmlinux += --pack-dyn-relocs=relr 1001endif 1002 1003# We never want expected sections to be placed heuristically by the 1004# linker. All sections should be explicitly named in the linker script. 1005ifdef CONFIG_LD_ORPHAN_WARN 1006LDFLAGS_vmlinux += --orphan-handling=warn 1007endif 1008 1009# Align the bit size of userspace programs with the kernel 1010KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1011KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1012 1013# make the checker run with the right architecture 1014CHECKFLAGS += --arch=$(ARCH) 1015 1016# insure the checker run with the right endianness 1017CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1018 1019# the checker needs the correct machine size 1020CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1021 1022# Default kernel image to build when no specific target is given. 1023# KBUILD_IMAGE may be overruled on the command line or 1024# set in the environment 1025# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1026# this default value 1027export KBUILD_IMAGE ?= vmlinux 1028 1029# 1030# INSTALL_PATH specifies where to place the updated kernel and system map 1031# images. Default is /boot, but you can set it to other values 1032export INSTALL_PATH ?= /boot 1033 1034# 1035# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1036# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1037# an argument if needed. Otherwise it defaults to the kernel install path 1038# 1039export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1040 1041# 1042# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1043# relocations required by build roots. This is not defined in the 1044# makefile but the argument can be passed to make if needed. 1045# 1046 1047MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1048export MODLIB 1049 1050# 1051# INSTALL_MOD_STRIP, if defined, will cause modules to be 1052# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1053# the default option --strip-debug will be used. Otherwise, 1054# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1055 1056ifdef INSTALL_MOD_STRIP 1057ifeq ($(INSTALL_MOD_STRIP),1) 1058mod_strip_cmd = $(STRIP) --strip-debug 1059else 1060mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1061endif # INSTALL_MOD_STRIP=1 1062else 1063mod_strip_cmd = true 1064endif # INSTALL_MOD_STRIP 1065export mod_strip_cmd 1066 1067# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1068# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1069# or CONFIG_MODULE_COMPRESS_XZ. 1070 1071mod_compress_cmd = true 1072ifdef CONFIG_MODULE_COMPRESS 1073 ifdef CONFIG_MODULE_COMPRESS_GZIP 1074 mod_compress_cmd = $(KGZIP) -n -f 1075 endif # CONFIG_MODULE_COMPRESS_GZIP 1076 ifdef CONFIG_MODULE_COMPRESS_XZ 1077 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f 1078 endif # CONFIG_MODULE_COMPRESS_XZ 1079endif # CONFIG_MODULE_COMPRESS 1080export mod_compress_cmd 1081 1082ifdef CONFIG_MODULE_SIG_ALL 1083$(eval $(call config_filename,MODULE_SIG_KEY)) 1084 1085mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1086else 1087mod_sign_cmd = true 1088endif 1089export mod_sign_cmd 1090 1091HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1092 1093has_libelf = $(call try-run,\ 1094 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1095 1096ifdef CONFIG_STACK_VALIDATION 1097 ifeq ($(has_libelf),1) 1098 objtool_target := tools/objtool FORCE 1099 else 1100 SKIP_STACK_VALIDATION := 1 1101 export SKIP_STACK_VALIDATION 1102 endif 1103endif 1104 1105PHONY += resolve_btfids_clean 1106 1107resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1108 1109# tools/bpf/resolve_btfids directory might not exist 1110# in output directory, skip its clean in that case 1111resolve_btfids_clean: 1112ifneq ($(wildcard $(resolve_btfids_O)),) 1113 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1114endif 1115 1116ifdef CONFIG_BPF 1117ifdef CONFIG_DEBUG_INFO_BTF 1118 ifeq ($(has_libelf),1) 1119 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1120 else 1121 ERROR_RESOLVE_BTFIDS := 1 1122 endif 1123endif # CONFIG_DEBUG_INFO_BTF 1124endif # CONFIG_BPF 1125 1126PHONY += prepare0 1127 1128extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1129export MODORDER := $(extmod-prefix)modules.order 1130export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1131 1132ifeq ($(KBUILD_EXTMOD),) 1133core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1134 1135vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1136 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1137 $(libs-y) $(libs-m))) 1138 1139vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1140 $(patsubst %/,%,$(filter %/, $(core-) \ 1141 $(drivers-) $(libs-)))) 1142 1143subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1144 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1145 $(drivers-y) $(drivers-m))) 1146 1147build-dirs := $(vmlinux-dirs) 1148clean-dirs := $(vmlinux-alldirs) 1149 1150# Externally visible symbols (used by link-vmlinux.sh) 1151KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1152KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1153ifdef CONFIG_MODULES 1154KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1155KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1156else 1157KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1158endif 1159KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1160 1161export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1162export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1163# used by scripts/Makefile.package 1164export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1165 1166vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1167 1168# Recurse until adjust_autoksyms.sh is satisfied 1169PHONY += autoksyms_recursive 1170ifdef CONFIG_TRIM_UNUSED_KSYMS 1171# For the kernel to actually contain only the needed exported symbols, 1172# we have to build modules as well to determine what those symbols are. 1173# (this can be evaluated only once include/config/auto.conf has been included) 1174KBUILD_MODULES := 1 1175 1176autoksyms_recursive: descend modules.order 1177 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1178 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1179endif 1180 1181autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1182 1183quiet_cmd_autoksyms_h = GEN $@ 1184 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1185 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1186 1187$(autoksyms_h): 1188 $(call cmd,autoksyms_h) 1189 1190ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1191 1192# Final link of vmlinux with optional arch pass after final link 1193cmd_link-vmlinux = \ 1194 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1195 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1196 1197vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1198 +$(call if_changed,link-vmlinux) 1199 1200targets := vmlinux 1201 1202# The actual objects are generated when descending, 1203# make sure no implicit rule kicks in 1204$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1205 1206filechk_kernel.release = \ 1207 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1208 1209# Store (new) KERNELRELEASE string in include/config/kernel.release 1210include/config/kernel.release: FORCE 1211 $(call filechk,kernel.release) 1212 1213# Additional helpers built in scripts/ 1214# Carefully list dependencies so we do not try to build scripts twice 1215# in parallel 1216PHONY += scripts 1217scripts: scripts_basic scripts_dtc 1218 $(Q)$(MAKE) $(build)=$(@) 1219 1220# Things we need to do before we recursively start building the kernel 1221# or the modules are listed in "prepare". 1222# A multi level approach is used. prepareN is processed before prepareN-1. 1223# archprepare is used in arch Makefiles and when processed asm symlink, 1224# version.h and scripts_basic is processed / created. 1225 1226PHONY += prepare archprepare 1227 1228archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1229 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1230 include/generated/autoconf.h 1231 1232prepare0: archprepare 1233 $(Q)$(MAKE) $(build)=scripts/mod 1234 $(Q)$(MAKE) $(build)=. 1235 1236# All the preparing.. 1237prepare: prepare0 prepare-objtool prepare-resolve_btfids 1238 1239# Support for using generic headers in asm-generic 1240asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1241 1242PHONY += asm-generic uapi-asm-generic 1243asm-generic: uapi-asm-generic 1244 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1245 generic=include/asm-generic 1246uapi-asm-generic: 1247 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1248 generic=include/uapi/asm-generic 1249 1250PHONY += prepare-objtool prepare-resolve_btfids 1251prepare-objtool: $(objtool_target) 1252ifeq ($(SKIP_STACK_VALIDATION),1) 1253ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1254 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1255 @false 1256endif 1257ifdef CONFIG_UNWINDER_ORC 1258 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1259 @false 1260else 1261 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1262endif 1263endif 1264 1265prepare-resolve_btfids: $(resolve_btfids_target) 1266ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1267 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1268 @false 1269endif 1270# Generate some files 1271# --------------------------------------------------------------------------- 1272 1273# KERNELRELEASE can change from a few different places, meaning version.h 1274# needs to be updated, so this check is forced on all builds 1275 1276uts_len := 64 1277define filechk_utsrelease.h 1278 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1279 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1280 exit 1; \ 1281 fi; \ 1282 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1283endef 1284 1285define filechk_version.h 1286 if [ $(SUBLEVEL) -gt 255 ]; then \ 1287 echo \#define LINUX_VERSION_CODE $(shell \ 1288 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1289 else \ 1290 echo \#define LINUX_VERSION_CODE $(shell \ 1291 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1292 fi; \ 1293 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1294 ((c) > 255 ? 255 : (c)))'; \ 1295 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1296 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1297 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1298endef 1299 1300$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1301$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1302$(version_h): FORCE 1303 $(call filechk,version.h) 1304 1305include/generated/utsrelease.h: include/config/kernel.release FORCE 1306 $(call filechk,utsrelease.h) 1307 1308PHONY += headerdep 1309headerdep: 1310 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1311 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1312 1313# --------------------------------------------------------------------------- 1314# Kernel headers 1315 1316#Default location for installed headers 1317export INSTALL_HDR_PATH = $(objtree)/usr 1318 1319quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1320 cmd_headers_install = \ 1321 mkdir -p $(INSTALL_HDR_PATH); \ 1322 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1323 usr/include $(INSTALL_HDR_PATH) 1324 1325PHONY += headers_install 1326headers_install: headers 1327 $(call cmd,headers_install) 1328 1329PHONY += archheaders archscripts 1330 1331hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1332 1333PHONY += headers 1334headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1335 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1336 $(error Headers not exportable for the $(SRCARCH) architecture)) 1337 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1338 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1339 1340# Deprecated. It is no-op now. 1341PHONY += headers_check 1342headers_check: 1343 @: 1344 1345ifdef CONFIG_HEADERS_INSTALL 1346prepare: headers 1347endif 1348 1349PHONY += scripts_unifdef 1350scripts_unifdef: scripts_basic 1351 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1352 1353# --------------------------------------------------------------------------- 1354# Kernel selftest 1355 1356PHONY += kselftest 1357kselftest: 1358 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1359 1360kselftest-%: FORCE 1361 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1362 1363PHONY += kselftest-merge 1364kselftest-merge: 1365 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1366 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1367 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1368 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1369 1370# --------------------------------------------------------------------------- 1371# Devicetree files 1372 1373ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1374dtstree := arch/$(SRCARCH)/boot/dts 1375endif 1376 1377ifneq ($(dtstree),) 1378 1379%.dtb: include/config/kernel.release scripts_dtc 1380 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1381 1382%.dtbo: include/config/kernel.release scripts_dtc 1383 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1384 1385PHONY += dtbs dtbs_install dtbs_check 1386dtbs: include/config/kernel.release scripts_dtc 1387 $(Q)$(MAKE) $(build)=$(dtstree) 1388 1389ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1390export CHECK_DTBS=y 1391dtbs: dt_binding_check 1392endif 1393 1394dtbs_check: dtbs 1395 1396dtbs_install: 1397 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1398 1399ifdef CONFIG_OF_EARLY_FLATTREE 1400all: dtbs 1401endif 1402 1403endif 1404 1405PHONY += scripts_dtc 1406scripts_dtc: scripts_basic 1407 $(Q)$(MAKE) $(build)=scripts/dtc 1408 1409ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1410export CHECK_DT_BINDING=y 1411endif 1412 1413PHONY += dt_binding_check 1414dt_binding_check: scripts_dtc 1415 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1416 1417# --------------------------------------------------------------------------- 1418# Modules 1419 1420ifdef CONFIG_MODULES 1421 1422# By default, build modules as well 1423 1424all: modules 1425 1426# When we're building modules with modversions, we need to consider 1427# the built-in objects during the descend as well, in order to 1428# make sure the checksums are up to date before we record them. 1429ifdef CONFIG_MODVERSIONS 1430 KBUILD_BUILTIN := 1 1431endif 1432 1433# Build modules 1434# 1435# A module can be listed more than once in obj-m resulting in 1436# duplicate lines in modules.order files. Those are removed 1437# using awk while concatenating to the final file. 1438 1439PHONY += modules 1440modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1442 1443PHONY += modules_check 1444modules_check: modules.order 1445 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1446 1447cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1448 1449modules.order: $(subdir-modorder) FORCE 1450 $(call if_changed,modules_order) 1451 1452targets += modules.order 1453 1454# Target to prepare building external modules 1455PHONY += modules_prepare 1456modules_prepare: prepare 1457 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1458 1459# Target to install modules 1460PHONY += modules_install 1461modules_install: _modinst_ _modinst_post 1462 1463PHONY += _modinst_ 1464_modinst_: 1465 @rm -rf $(MODLIB)/kernel 1466 @rm -f $(MODLIB)/source 1467 @mkdir -p $(MODLIB)/kernel 1468 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1469 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1470 rm -f $(MODLIB)/build ; \ 1471 ln -s $(CURDIR) $(MODLIB)/build ; \ 1472 fi 1473 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1474 @cp -f modules.builtin $(MODLIB)/ 1475 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1476 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1477 1478# This depmod is only for convenience to give the initial 1479# boot a modules.dep even before / is mounted read-write. However the 1480# boot script depmod is the master version. 1481PHONY += _modinst_post 1482_modinst_post: _modinst_ 1483 $(call cmd,depmod) 1484 1485ifeq ($(CONFIG_MODULE_SIG), y) 1486PHONY += modules_sign 1487modules_sign: 1488 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1489endif 1490 1491else # CONFIG_MODULES 1492 1493# Modules not configured 1494# --------------------------------------------------------------------------- 1495 1496PHONY += modules modules_install 1497modules modules_install: 1498 @echo >&2 1499 @echo >&2 "The present kernel configuration has modules disabled." 1500 @echo >&2 "Type 'make config' and enable loadable module support." 1501 @echo >&2 "Then build a kernel with module support enabled." 1502 @echo >&2 1503 @exit 1 1504 1505endif # CONFIG_MODULES 1506 1507### 1508# Cleaning is done on three levels. 1509# make clean Delete most generated files 1510# Leave enough to build external modules 1511# make mrproper Delete the current configuration, and all generated files 1512# make distclean Remove editor backup files, patch leftover files and the like 1513 1514# Directories & files removed with 'make clean' 1515CLEAN_FILES += include/ksym vmlinux.symvers \ 1516 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1517 compile_commands.json .thinlto-cache 1518 1519# Directories & files removed with 'make mrproper' 1520MRPROPER_FILES += include/config include/generated \ 1521 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1522 debian snap tar-install \ 1523 .config .config.old .version \ 1524 Module.symvers \ 1525 signing_key.pem signing_key.priv signing_key.x509 \ 1526 x509.genkey extra_certificates signing_key.x509.keyid \ 1527 signing_key.x509.signer vmlinux-gdb.py \ 1528 *.spec 1529 1530# Directories & files removed with 'make distclean' 1531DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1532 1533# clean - Delete most, but leave enough to build external modules 1534# 1535clean: rm-files := $(CLEAN_FILES) 1536 1537PHONY += archclean vmlinuxclean 1538 1539vmlinuxclean: 1540 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1541 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1542 1543clean: archclean vmlinuxclean resolve_btfids_clean 1544 1545# mrproper - Delete all generated files, including .config 1546# 1547mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1548mrproper-dirs := $(addprefix _mrproper_,scripts) 1549 1550PHONY += $(mrproper-dirs) mrproper 1551$(mrproper-dirs): 1552 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1553 1554mrproper: clean $(mrproper-dirs) 1555 $(call cmd,rmfiles) 1556 1557# distclean 1558# 1559distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1560 1561PHONY += distclean 1562 1563distclean: mrproper 1564 $(call cmd,rmfiles) 1565 @find $(srctree) $(RCS_FIND_IGNORE) \ 1566 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1567 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1568 -o -name 'core' \) \ 1569 -type f -print | xargs rm -f 1570 1571 1572# Packaging of the kernel to various formats 1573# --------------------------------------------------------------------------- 1574 1575%src-pkg: FORCE 1576 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1577%pkg: include/config/kernel.release FORCE 1578 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1579 1580# Brief documentation of the typical targets used 1581# --------------------------------------------------------------------------- 1582 1583boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1584boards := $(sort $(notdir $(boards))) 1585board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1586board-dirs := $(sort $(notdir $(board-dirs:/=))) 1587 1588PHONY += help 1589help: 1590 @echo 'Cleaning targets:' 1591 @echo ' clean - Remove most generated files but keep the config and' 1592 @echo ' enough build support to build external modules' 1593 @echo ' mrproper - Remove all generated files + config + various backup files' 1594 @echo ' distclean - mrproper + remove editor backup and patch files' 1595 @echo '' 1596 @echo 'Configuration targets:' 1597 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1598 @echo '' 1599 @echo 'Other generic targets:' 1600 @echo ' all - Build all targets marked with [*]' 1601 @echo '* vmlinux - Build the bare kernel' 1602 @echo '* modules - Build all modules' 1603 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1604 @echo ' dir/ - Build all files in dir and below' 1605 @echo ' dir/file.[ois] - Build specified target only' 1606 @echo ' dir/file.ll - Build the LLVM assembly file' 1607 @echo ' (requires compiler support for LLVM assembly generation)' 1608 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1609 @echo ' (requires a recent binutils and recent build (System.map))' 1610 @echo ' dir/file.ko - Build module including final link' 1611 @echo ' modules_prepare - Set up for building external modules' 1612 @echo ' tags/TAGS - Generate tags file for editors' 1613 @echo ' cscope - Generate cscope index' 1614 @echo ' gtags - Generate GNU GLOBAL index' 1615 @echo ' kernelrelease - Output the release version string (use with make -s)' 1616 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1617 @echo ' image_name - Output the image name (use with make -s)' 1618 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1619 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1620 echo '' 1621 @echo 'Static analysers:' 1622 @echo ' checkstack - Generate a list of stack hogs' 1623 @echo ' versioncheck - Sanity check on version.h usage' 1624 @echo ' includecheck - Check for duplicate included header files' 1625 @echo ' export_report - List the usages of all exported symbols' 1626 @echo ' headerdep - Detect inclusion cycles in headers' 1627 @echo ' coccicheck - Check with Coccinelle' 1628 @echo ' clang-analyzer - Check with clang static analyzer' 1629 @echo ' clang-tidy - Check with clang-tidy' 1630 @echo '' 1631 @echo 'Tools:' 1632 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1633 @echo '' 1634 @echo 'Kernel selftest:' 1635 @echo ' kselftest - Build and run kernel selftest' 1636 @echo ' Build, install, and boot kernel before' 1637 @echo ' running kselftest on it' 1638 @echo ' Run as root for full coverage' 1639 @echo ' kselftest-all - Build kernel selftest' 1640 @echo ' kselftest-install - Build and install kernel selftest' 1641 @echo ' kselftest-clean - Remove all generated kselftest files' 1642 @echo ' kselftest-merge - Merge all the config dependencies of' 1643 @echo ' kselftest to existing .config.' 1644 @echo '' 1645 @$(if $(dtstree), \ 1646 echo 'Devicetree:'; \ 1647 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1648 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1649 echo ' dt_binding_check - Validate device tree binding documents'; \ 1650 echo ' dtbs_check - Validate device tree source files';\ 1651 echo '') 1652 1653 @echo 'Userspace tools targets:' 1654 @echo ' use "make tools/help"' 1655 @echo ' or "cd tools; make help"' 1656 @echo '' 1657 @echo 'Kernel packaging:' 1658 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1659 @echo '' 1660 @echo 'Documentation targets:' 1661 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1662 @echo '' 1663 @echo 'Architecture specific targets ($(SRCARCH)):' 1664 @$(if $(archhelp),$(archhelp),\ 1665 echo ' No architecture specific help defined for $(SRCARCH)') 1666 @echo '' 1667 @$(if $(boards), \ 1668 $(foreach b, $(boards), \ 1669 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1670 echo '') 1671 @$(if $(board-dirs), \ 1672 $(foreach b, $(board-dirs), \ 1673 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1674 printf " %-16s - Show all of the above\\n" help-boards; \ 1675 echo '') 1676 1677 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1678 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1679 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1680 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1681 @echo ' (sparse by default)' 1682 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1683 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1684 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1685 @echo ' 1: warnings which may be relevant and do not occur too often' 1686 @echo ' 2: warnings which occur quite often but may still be relevant' 1687 @echo ' 3: more obscure warnings, can most likely be ignored' 1688 @echo ' Multiple levels can be combined with W=12 or W=123' 1689 @echo '' 1690 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1691 @echo 'For further info see the ./README file' 1692 1693 1694help-board-dirs := $(addprefix help-,$(board-dirs)) 1695 1696help-boards: $(help-board-dirs) 1697 1698boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1699 1700$(help-board-dirs): help-%: 1701 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1702 @$(if $(boards-per-dir), \ 1703 $(foreach b, $(boards-per-dir), \ 1704 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1705 echo '') 1706 1707 1708# Documentation targets 1709# --------------------------------------------------------------------------- 1710DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1711 linkcheckdocs dochelp refcheckdocs 1712PHONY += $(DOC_TARGETS) 1713$(DOC_TARGETS): 1714 $(Q)$(MAKE) $(build)=Documentation $@ 1715 1716# Misc 1717# --------------------------------------------------------------------------- 1718 1719PHONY += scripts_gdb 1720scripts_gdb: prepare0 1721 $(Q)$(MAKE) $(build)=scripts/gdb 1722 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1723 1724ifdef CONFIG_GDB_SCRIPTS 1725all: scripts_gdb 1726endif 1727 1728else # KBUILD_EXTMOD 1729 1730### 1731# External module support. 1732# When building external modules the kernel used as basis is considered 1733# read-only, and no consistency checks are made and the make 1734# system is not used on the basis kernel. If updates are required 1735# in the basis kernel ordinary make commands (without M=...) must 1736# be used. 1737# 1738# The following are the only valid targets when building external 1739# modules. 1740# make M=dir clean Delete all automatically generated files 1741# make M=dir modules Make all modules in specified dir 1742# make M=dir Same as 'make M=dir modules' 1743# make M=dir modules_install 1744# Install the modules built in the module directory 1745# Assumes install directory is already created 1746 1747# We are always building only modules. 1748KBUILD_BUILTIN := 1749KBUILD_MODULES := 1 1750 1751build-dirs := $(KBUILD_EXTMOD) 1752PHONY += modules 1753modules: $(MODORDER) 1754 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1755 1756$(MODORDER): descend 1757 @: 1758 1759PHONY += modules_install 1760modules_install: _emodinst_ _emodinst_post 1761 1762install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1763PHONY += _emodinst_ 1764_emodinst_: 1765 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1766 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1767 1768PHONY += _emodinst_post 1769_emodinst_post: _emodinst_ 1770 $(call cmd,depmod) 1771 1772compile_commands.json: $(extmod-prefix)compile_commands.json 1773PHONY += compile_commands.json 1774 1775clean-dirs := $(KBUILD_EXTMOD) 1776clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1777 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1778 1779PHONY += help 1780help: 1781 @echo ' Building external modules.' 1782 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1783 @echo '' 1784 @echo ' modules - default target, build the module(s)' 1785 @echo ' modules_install - install the module' 1786 @echo ' clean - remove generated files in module directory only' 1787 @echo '' 1788 1789# no-op for external module builds 1790PHONY += prepare modules_prepare 1791 1792endif # KBUILD_EXTMOD 1793 1794# Single targets 1795# --------------------------------------------------------------------------- 1796# To build individual files in subdirectories, you can do like this: 1797# 1798# make foo/bar/baz.s 1799# 1800# The supported suffixes for single-target are listed in 'single-targets' 1801# 1802# To build only under specific subdirectories, you can do like this: 1803# 1804# make foo/bar/baz/ 1805 1806ifdef single-build 1807 1808# .ko is special because modpost is needed 1809single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1810single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1811 1812$(single-ko): single_modpost 1813 @: 1814$(single-no-ko): descend 1815 @: 1816 1817ifeq ($(KBUILD_EXTMOD),) 1818# For the single build of in-tree modules, use a temporary file to avoid 1819# the situation of modules_install installing an invalid modules.order. 1820MODORDER := .modules.tmp 1821endif 1822 1823PHONY += single_modpost 1824single_modpost: $(single-no-ko) modules_prepare 1825 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1826 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1827 1828KBUILD_MODULES := 1 1829 1830export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1831 1832# trim unrelated directories 1833build-dirs := $(foreach d, $(build-dirs), \ 1834 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1835 1836endif 1837 1838ifndef CONFIG_MODULES 1839KBUILD_MODULES := 1840endif 1841 1842# Handle descending into subdirectories listed in $(build-dirs) 1843# Preset locale variables to speed up the build process. Limit locale 1844# tweaks to this spot to avoid wrong language settings when running 1845# make menuconfig etc. 1846# Error messages still appears in the original language 1847PHONY += descend $(build-dirs) 1848descend: $(build-dirs) 1849$(build-dirs): prepare 1850 $(Q)$(MAKE) $(build)=$@ \ 1851 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1852 need-builtin=1 need-modorder=1 1853 1854clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1855PHONY += $(clean-dirs) clean 1856$(clean-dirs): 1857 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1858 1859clean: $(clean-dirs) 1860 $(call cmd,rmfiles) 1861 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1862 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1863 -o -name '*.ko.*' \ 1864 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1865 -o -name '*.dwo' -o -name '*.lst' \ 1866 -o -name '*.su' -o -name '*.mod' \ 1867 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1868 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1869 -o -name '*.asn1.[ch]' \ 1870 -o -name '*.symtypes' -o -name 'modules.order' \ 1871 -o -name '.tmp_*.o.*' \ 1872 -o -name '*.c.[012]*.*' \ 1873 -o -name '*.ll' \ 1874 -o -name '*.gcno' \ 1875 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1876 1877# Generate tags for editors 1878# --------------------------------------------------------------------------- 1879quiet_cmd_tags = GEN $@ 1880 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1881 1882tags TAGS cscope gtags: FORCE 1883 $(call cmd,tags) 1884 1885# Script to generate missing namespace dependencies 1886# --------------------------------------------------------------------------- 1887 1888PHONY += nsdeps 1889nsdeps: export KBUILD_NSDEPS=1 1890nsdeps: modules 1891 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1892 1893# Clang Tooling 1894# --------------------------------------------------------------------------- 1895 1896quiet_cmd_gen_compile_commands = GEN $@ 1897 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1898 1899$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1900 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1901 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1902 $(call if_changed,gen_compile_commands) 1903 1904targets += $(extmod-prefix)compile_commands.json 1905 1906PHONY += clang-tidy clang-analyzer 1907 1908ifdef CONFIG_CC_IS_CLANG 1909quiet_cmd_clang_tools = CHECK $< 1910 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1911 1912clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1913 $(call cmd,clang_tools) 1914else 1915clang-tidy clang-analyzer: 1916 @echo "$@ requires CC=clang" >&2 1917 @false 1918endif 1919 1920# Scripts to check various things for consistency 1921# --------------------------------------------------------------------------- 1922 1923PHONY += includecheck versioncheck coccicheck export_report 1924 1925includecheck: 1926 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1927 -name '*.[hcS]' -type f -print | sort \ 1928 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1929 1930versioncheck: 1931 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1932 -name '*.[hcS]' -type f -print | sort \ 1933 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1934 1935coccicheck: 1936 $(Q)$(BASH) $(srctree)/scripts/$@ 1937 1938export_report: 1939 $(PERL) $(srctree)/scripts/export_report.pl 1940 1941PHONY += checkstack kernelrelease kernelversion image_name 1942 1943# UML needs a little special treatment here. It wants to use the host 1944# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1945# else wants $(ARCH), including people doing cross-builds, which means 1946# that $(SUBARCH) doesn't work here. 1947ifeq ($(ARCH), um) 1948CHECKSTACK_ARCH := $(SUBARCH) 1949else 1950CHECKSTACK_ARCH := $(ARCH) 1951endif 1952checkstack: 1953 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1954 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1955 1956kernelrelease: 1957 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1958 1959kernelversion: 1960 @echo $(KERNELVERSION) 1961 1962image_name: 1963 @echo $(KBUILD_IMAGE) 1964 1965# Clear a bunch of variables before executing the submake 1966 1967ifeq ($(quiet),silent_) 1968tools_silent=s 1969endif 1970 1971tools/: FORCE 1972 $(Q)mkdir -p $(objtree)/tools 1973 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1974 1975tools/%: FORCE 1976 $(Q)mkdir -p $(objtree)/tools 1977 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1978 1979quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1980 cmd_rmfiles = rm -rf $(rm-files) 1981 1982# Run depmod only if we have System.map and depmod is executable 1983quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1984 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1985 $(KERNELRELEASE) 1986 1987# read saved command lines for existing targets 1988existing-targets := $(wildcard $(sort $(targets))) 1989 1990-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1991 1992endif # config-build 1993endif # mixed-build 1994endif # need-sub-make 1995 1996PHONY += FORCE 1997FORCE: 1998 1999# Declare the contents of the PHONY variable as phony. We keep that 2000# information in a variable so we can use it in if_changed and friends. 2001.PHONY: $(PHONY) 2002