1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 13 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Opossums on Parade 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132export KBUILD_EXTMOD 133 134# Kbuild will save output files in the current working directory. 135# This does not need to match to the root of the kernel source tree. 136# 137# For example, you can do this: 138# 139# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 140# 141# If you want to save output files in a different location, there are 142# two syntaxes to specify it. 143# 144# 1) O= 145# Use "make O=dir/to/store/output/files/" 146# 147# 2) Set KBUILD_OUTPUT 148# Set the environment variable KBUILD_OUTPUT to point to the output directory. 149# export KBUILD_OUTPUT=dir/to/store/output/files/; make 150# 151# The O= assignment takes precedence over the KBUILD_OUTPUT environment 152# variable. 153 154# Do we want to change the working directory? 155ifeq ("$(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 267# Installation targets should not require compiler. Unfortunately, vdso_install 268# is an exception where build artifacts may be updated. This must be fixed. 269no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 270 headers_install modules_install kernelrelease image_name 271no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 272 image_name 273single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 274 275config-build := 276mixed-build := 277need-config := 1 278need-compiler := 1 279may-sync-config := 1 280single-build := 281 282ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 283 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 284 need-config := 285 endif 286endif 287 288ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 289 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 290 need-compiler := 291 endif 292endif 293 294ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 296 may-sync-config := 297 endif 298endif 299 300ifneq ($(KBUILD_EXTMOD),) 301 may-sync-config := 302endif 303 304ifeq ($(KBUILD_EXTMOD),) 305 ifneq ($(filter %config,$(MAKECMDGOALS)),) 306 config-build := 1 307 ifneq ($(words $(MAKECMDGOALS)),1) 308 mixed-build := 1 309 endif 310 endif 311endif 312 313# We cannot build single targets and the others at the same time 314ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 315 single-build := 1 316 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 317 mixed-build := 1 318 endif 319endif 320 321# For "make -j clean all", "make -j mrproper defconfig all", etc. 322ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 323 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 324 mixed-build := 1 325 endif 326endif 327 328# install and modules_install need also be processed one by one 329ifneq ($(filter install,$(MAKECMDGOALS)),) 330 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 331 mixed-build := 1 332 endif 333endif 334 335ifdef mixed-build 336# =========================================================================== 337# We're called with mixed targets (*config and build targets). 338# Handle them one by one. 339 340PHONY += $(MAKECMDGOALS) __build_one_by_one 341 342$(MAKECMDGOALS): __build_one_by_one 343 @: 344 345__build_one_by_one: 346 $(Q)set -e; \ 347 for i in $(MAKECMDGOALS); do \ 348 $(MAKE) -f $(srctree)/Makefile $$i; \ 349 done 350 351else # !mixed-build 352 353include $(srctree)/scripts/Kbuild.include 354 355# Read KERNELRELEASE from include/config/kernel.release (if it exists) 356KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 357KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 358export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 359 360include $(srctree)/scripts/subarch.include 361 362# Cross compiling and selecting different set of gcc/bin-utils 363# --------------------------------------------------------------------------- 364# 365# When performing cross compilation for other architectures ARCH shall be set 366# to the target architecture. (See arch/* for the possibilities). 367# ARCH can be set during invocation of make: 368# make ARCH=ia64 369# Another way is to have ARCH set in the environment. 370# The default ARCH is the host where make is executed. 371 372# CROSS_COMPILE specify the prefix used for all executables used 373# during compilation. Only gcc and related bin-utils executables 374# are prefixed with $(CROSS_COMPILE). 375# CROSS_COMPILE can be set on the command line 376# make CROSS_COMPILE=ia64-linux- 377# Alternatively CROSS_COMPILE can be set in the environment. 378# Default value for CROSS_COMPILE is not to prefix executables 379# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 380ARCH ?= $(SUBARCH) 381 382# Architecture as present in compile.h 383UTS_MACHINE := $(ARCH) 384SRCARCH := $(ARCH) 385 386# Additional ARCH settings for x86 387ifeq ($(ARCH),i386) 388 SRCARCH := x86 389endif 390ifeq ($(ARCH),x86_64) 391 SRCARCH := x86 392endif 393 394# Additional ARCH settings for sparc 395ifeq ($(ARCH),sparc32) 396 SRCARCH := sparc 397endif 398ifeq ($(ARCH),sparc64) 399 SRCARCH := sparc 400endif 401 402export cross_compiling := 403ifneq ($(SRCARCH),$(SUBARCH)) 404cross_compiling := 1 405endif 406 407KCONFIG_CONFIG ?= .config 408export KCONFIG_CONFIG 409 410# SHELL used by kbuild 411CONFIG_SHELL := sh 412 413HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 414HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 415HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 416 417ifneq ($(LLVM),) 418HOSTCC = clang 419HOSTCXX = clang++ 420else 421HOSTCC = gcc 422HOSTCXX = g++ 423endif 424 425export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 426 -O2 -fomit-frame-pointer -std=gnu89 427export KBUILD_USERLDFLAGS := 428 429KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 430KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 431KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 432KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 433 434# Make variables (CC, etc...) 435CPP = $(CC) -E 436ifneq ($(LLVM),) 437CC = clang 438LD = ld.lld 439AR = llvm-ar 440NM = llvm-nm 441OBJCOPY = llvm-objcopy 442OBJDUMP = llvm-objdump 443READELF = llvm-readelf 444STRIP = llvm-strip 445else 446CC = $(CROSS_COMPILE)gcc 447LD = $(CROSS_COMPILE)ld 448AR = $(CROSS_COMPILE)ar 449NM = $(CROSS_COMPILE)nm 450OBJCOPY = $(CROSS_COMPILE)objcopy 451OBJDUMP = $(CROSS_COMPILE)objdump 452READELF = $(CROSS_COMPILE)readelf 453STRIP = $(CROSS_COMPILE)strip 454endif 455PAHOLE = pahole 456RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 457LEX = flex 458YACC = bison 459AWK = awk 460INSTALLKERNEL := installkernel 461DEPMOD = depmod 462PERL = perl 463PYTHON3 = python3 464CHECK = sparse 465BASH = bash 466KGZIP = gzip 467KBZIP2 = bzip2 468KLZOP = lzop 469LZMA = lzma 470LZ4 = lz4c 471XZ = xz 472ZSTD = zstd 473 474CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 475 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 476NOSTDINC_FLAGS := 477CFLAGS_MODULE = 478AFLAGS_MODULE = 479LDFLAGS_MODULE = 480CFLAGS_KERNEL = 481AFLAGS_KERNEL = 482LDFLAGS_vmlinux = 483 484# Use USERINCLUDE when you must reference the UAPI directories only. 485USERINCLUDE := \ 486 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 487 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 488 -I$(srctree)/include/uapi \ 489 -I$(objtree)/include/generated/uapi \ 490 -include $(srctree)/include/linux/compiler-version.h \ 491 -include $(srctree)/include/linux/kconfig.h 492 493# Use LINUXINCLUDE when you must reference the include/ directory. 494# Needed to be compatible with the O= option 495LINUXINCLUDE := \ 496 -I$(srctree)/arch/$(SRCARCH)/include \ 497 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 498 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 499 -I$(objtree)/include \ 500 $(USERINCLUDE) 501 502KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 503KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 504 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 505 -Werror=implicit-function-declaration -Werror=implicit-int \ 506 -Werror=return-type -Wno-format-security \ 507 -std=gnu89 508KBUILD_CPPFLAGS := -D__KERNEL__ 509KBUILD_AFLAGS_KERNEL := 510KBUILD_CFLAGS_KERNEL := 511KBUILD_AFLAGS_MODULE := -DMODULE 512KBUILD_CFLAGS_MODULE := -DMODULE 513KBUILD_LDFLAGS_MODULE := 514KBUILD_LDFLAGS := 515CLANG_FLAGS := 516 517export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 518export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 519export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 520export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 521export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 522 523export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 524export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 525export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 526export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 527export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 528 529# Files to ignore in find ... statements 530 531export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 532 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 533 -prune -o 534export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 535 --exclude CVS --exclude .pc --exclude .hg --exclude .git 536 537# =========================================================================== 538# Rules shared between *config targets and build targets 539 540# Basic helpers built in scripts/basic/ 541PHONY += scripts_basic 542scripts_basic: 543 $(Q)$(MAKE) $(build)=scripts/basic 544 $(Q)rm -f .tmp_quiet_recordmcount 545 546PHONY += outputmakefile 547# Before starting out-of-tree build, make sure the source tree is clean. 548# outputmakefile generates a Makefile in the output directory, if using a 549# separate output directory. This allows convenient use of make in the 550# output directory. 551# At the same time when output Makefile generated, generate .gitignore to 552# ignore whole output directory 553outputmakefile: 554ifdef building_out_of_srctree 555 $(Q)if [ -f $(srctree)/.config -o \ 556 -d $(srctree)/include/config -o \ 557 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 558 echo >&2 "***"; \ 559 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 560 echo >&2 "*** in $(abs_srctree)";\ 561 echo >&2 "***"; \ 562 false; \ 563 fi 564 $(Q)ln -fsn $(srctree) source 565 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 566 $(Q)test -e .gitignore || \ 567 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 568endif 569 570# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 571# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 572# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 573# and from include/config/auto.conf.cmd to detect the compiler upgrade. 574CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 575 576ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 577ifneq ($(CROSS_COMPILE),) 578CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 579endif 580ifeq ($(LLVM_IAS),1) 581CLANG_FLAGS += -integrated-as 582else 583CLANG_FLAGS += -no-integrated-as 584GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 585CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 586endif 587CLANG_FLAGS += -Werror=unknown-warning-option 588KBUILD_CFLAGS += $(CLANG_FLAGS) 589KBUILD_AFLAGS += $(CLANG_FLAGS) 590export CLANG_FLAGS 591endif 592 593# Include this also for config targets because some architectures need 594# cc-cross-prefix to determine CROSS_COMPILE. 595ifdef need-compiler 596include $(srctree)/scripts/Makefile.compiler 597endif 598 599ifdef config-build 600# =========================================================================== 601# *config targets only - make sure prerequisites are updated, and descend 602# in scripts/kconfig to make the *config target 603 604# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 605# KBUILD_DEFCONFIG may point out an alternative default configuration 606# used for 'make defconfig' 607include $(srctree)/arch/$(SRCARCH)/Makefile 608export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 609 610config: outputmakefile scripts_basic FORCE 611 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 612 613%config: outputmakefile scripts_basic FORCE 614 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 615 616else #!config-build 617# =========================================================================== 618# Build targets only - this includes vmlinux, arch specific targets, clean 619# targets and others. In general all targets except *config targets. 620 621# If building an external module we do not care about the all: rule 622# but instead __all depend on modules 623PHONY += all 624ifeq ($(KBUILD_EXTMOD),) 625__all: all 626else 627__all: modules 628endif 629 630# Decide whether to build built-in, modular, or both. 631# Normally, just do built-in. 632 633KBUILD_MODULES := 634KBUILD_BUILTIN := 1 635 636# If we have only "make modules", don't compile built-in objects. 637ifeq ($(MAKECMDGOALS),modules) 638 KBUILD_BUILTIN := 639endif 640 641# If we have "make <whatever> modules", compile modules 642# in addition to whatever we do anyway. 643# Just "make" or "make all" shall build modules as well 644 645ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 646 KBUILD_MODULES := 1 647endif 648 649ifeq ($(MAKECMDGOALS),) 650 KBUILD_MODULES := 1 651endif 652 653export KBUILD_MODULES KBUILD_BUILTIN 654 655ifdef need-config 656include include/config/auto.conf 657endif 658 659ifeq ($(KBUILD_EXTMOD),) 660# Objects we will link into vmlinux / subdirs we need to visit 661core-y := init/ usr/ 662drivers-y := drivers/ sound/ 663drivers-$(CONFIG_SAMPLES) += samples/ 664drivers-$(CONFIG_NET) += net/ 665drivers-y += virt/ 666libs-y := lib/ 667endif # KBUILD_EXTMOD 668 669# The all: target is the default when no target is given on the 670# command line. 671# This allow a user to issue only 'make' to build a kernel including modules 672# Defaults to vmlinux, but the arch makefile usually adds further targets 673all: vmlinux 674 675CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 676 $(call cc-option,-fno-tree-loop-im) \ 677 $(call cc-disable-warning,maybe-uninitialized,) 678export CFLAGS_GCOV 679 680# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 681ifdef CONFIG_FUNCTION_TRACER 682 CC_FLAGS_FTRACE := -pg 683endif 684 685RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 686RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 687RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 688RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 689RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 690RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 691export RETPOLINE_CFLAGS 692export RETPOLINE_VDSO_CFLAGS 693 694include $(srctree)/arch/$(SRCARCH)/Makefile 695 696ifdef need-config 697ifdef may-sync-config 698# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 699# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 700# because some architectures define CROSS_COMPILE there. 701include include/config/auto.conf.cmd 702 703$(KCONFIG_CONFIG): 704 @echo >&2 '***' 705 @echo >&2 '*** Configuration file "$@" not found!' 706 @echo >&2 '***' 707 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 708 @echo >&2 '*** "make menuconfig" or "make xconfig").' 709 @echo >&2 '***' 710 @/bin/false 711 712# The actual configuration files used during the build are stored in 713# include/generated/ and include/config/. Update them if .config is newer than 714# include/config/auto.conf (which mirrors .config). 715# 716# This exploits the 'multi-target pattern rule' trick. 717# The syncconfig should be executed only once to make all the targets. 718# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 719quiet_cmd_syncconfig = SYNC $@ 720 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 721 722%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 723 +$(call cmd,syncconfig) 724else # !may-sync-config 725# External modules and some install targets need include/generated/autoconf.h 726# and include/config/auto.conf but do not care if they are up-to-date. 727# Use auto.conf to trigger the test 728PHONY += include/config/auto.conf 729 730include/config/auto.conf: 731 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 732 echo >&2; \ 733 echo >&2 " ERROR: Kernel configuration is invalid."; \ 734 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 735 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 736 echo >&2 ; \ 737 /bin/false) 738 739endif # may-sync-config 740endif # need-config 741 742KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 743KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 744KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 745KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 746KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 747 748ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 749KBUILD_CFLAGS += -O2 750else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 751KBUILD_CFLAGS += -O3 752else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 753KBUILD_CFLAGS += -Os 754endif 755 756# Tell gcc to never replace conditional load with a non-conditional one 757KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 758KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 759 760ifdef CONFIG_READABLE_ASM 761# Disable optimizations that make assembler listings hard to read. 762# reorder blocks reorders the control in the function 763# ipa clone creates specialized cloned functions 764# partial inlining inlines only parts of functions 765KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 766 $(call cc-option,-fno-ipa-cp-clone,) \ 767 $(call cc-option,-fno-partial-inlining) 768endif 769 770ifneq ($(CONFIG_FRAME_WARN),0) 771KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 772endif 773 774stackp-flags-y := -fno-stack-protector 775stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 776stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 777 778KBUILD_CFLAGS += $(stackp-flags-y) 779 780ifdef CONFIG_CC_IS_CLANG 781KBUILD_CPPFLAGS += -Qunused-arguments 782KBUILD_CFLAGS += -Wno-format-invalid-specifier 783KBUILD_CFLAGS += -Wno-gnu 784# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 785# source of a reference will be _MergedGlobals and not on of the whitelisted names. 786# See modpost pattern 2 787KBUILD_CFLAGS += -mno-global-merge 788else 789 790# Warn about unmarked fall-throughs in switch statement. 791# Disabled for clang while comment to attribute conversion happens and 792# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 793KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 794endif 795 796# These warnings generated too much noise in a regular build. 797# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 798KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 799 800KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 801ifdef CONFIG_FRAME_POINTER 802KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 803else 804# Some targets (ARM with Thumb2, for example), can't be built with frame 805# pointers. For those, we don't have FUNCTION_TRACER automatically 806# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 807# incompatible with -fomit-frame-pointer with current GCC, so we don't use 808# -fomit-frame-pointer with FUNCTION_TRACER. 809ifndef CONFIG_FUNCTION_TRACER 810KBUILD_CFLAGS += -fomit-frame-pointer 811endif 812endif 813 814# Initialize all stack variables with a 0xAA pattern. 815ifdef CONFIG_INIT_STACK_ALL_PATTERN 816KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 817endif 818 819# Initialize all stack variables with a zero value. 820ifdef CONFIG_INIT_STACK_ALL_ZERO 821# Future support for zero initialization is still being debated, see 822# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 823# renamed or dropped. 824KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 825KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 826endif 827 828# While VLAs have been removed, GCC produces unreachable stack probes 829# for the randomize_kstack_offset feature. Disable it for all compilers. 830KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 831 832DEBUG_CFLAGS := 833 834# Workaround for GCC versions < 5.0 835# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 836ifdef CONFIG_CC_IS_GCC 837DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 838endif 839 840ifdef CONFIG_DEBUG_INFO 841 842ifdef CONFIG_DEBUG_INFO_SPLIT 843DEBUG_CFLAGS += -gsplit-dwarf 844else 845DEBUG_CFLAGS += -g 846endif 847 848ifneq ($(LLVM_IAS),1) 849KBUILD_AFLAGS += -Wa,-gdwarf-2 850endif 851 852ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 853dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 854dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 855DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 856endif 857 858ifdef CONFIG_DEBUG_INFO_REDUCED 859DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 860 $(call cc-option,-fno-var-tracking) 861endif 862 863ifdef CONFIG_DEBUG_INFO_COMPRESSED 864DEBUG_CFLAGS += -gz=zlib 865KBUILD_AFLAGS += -gz=zlib 866KBUILD_LDFLAGS += --compress-debug-sections=zlib 867endif 868 869endif # CONFIG_DEBUG_INFO 870 871KBUILD_CFLAGS += $(DEBUG_CFLAGS) 872export DEBUG_CFLAGS 873 874ifdef CONFIG_FUNCTION_TRACER 875ifdef CONFIG_FTRACE_MCOUNT_USE_CC 876 CC_FLAGS_FTRACE += -mrecord-mcount 877 ifdef CONFIG_HAVE_NOP_MCOUNT 878 ifeq ($(call cc-option-yn, -mnop-mcount),y) 879 CC_FLAGS_FTRACE += -mnop-mcount 880 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 881 endif 882 endif 883endif 884ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 885 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 886endif 887ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 888 ifdef CONFIG_HAVE_C_RECORDMCOUNT 889 BUILD_C_RECORDMCOUNT := y 890 export BUILD_C_RECORDMCOUNT 891 endif 892endif 893ifdef CONFIG_HAVE_FENTRY 894 ifeq ($(call cc-option-yn, -mfentry),y) 895 CC_FLAGS_FTRACE += -mfentry 896 CC_FLAGS_USING += -DCC_USING_FENTRY 897 endif 898endif 899export CC_FLAGS_FTRACE 900KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 901KBUILD_AFLAGS += $(CC_FLAGS_USING) 902endif 903 904# We trigger additional mismatches with less inlining 905ifdef CONFIG_DEBUG_SECTION_MISMATCH 906KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 907endif 908 909ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 910KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 911LDFLAGS_vmlinux += --gc-sections 912endif 913 914ifdef CONFIG_SHADOW_CALL_STACK 915CC_FLAGS_SCS := -fsanitize=shadow-call-stack 916KBUILD_CFLAGS += $(CC_FLAGS_SCS) 917export CC_FLAGS_SCS 918endif 919 920ifdef CONFIG_LTO_CLANG 921ifdef CONFIG_LTO_CLANG_THIN 922CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 923KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 924else 925CC_FLAGS_LTO := -flto 926endif 927CC_FLAGS_LTO += -fvisibility=hidden 928 929# Limit inlining across translation units to reduce binary size 930KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 931 932# Check for frame size exceeding threshold during prolog/epilog insertion 933# when using lld < 13.0.0. 934ifneq ($(CONFIG_FRAME_WARN),0) 935ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 936KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 937endif 938endif 939endif 940 941ifdef CONFIG_LTO 942KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 943KBUILD_AFLAGS += -fno-lto 944export CC_FLAGS_LTO 945endif 946 947ifdef CONFIG_CFI_CLANG 948CC_FLAGS_CFI := -fsanitize=cfi \ 949 -fsanitize-cfi-cross-dso \ 950 -fno-sanitize-cfi-canonical-jump-tables \ 951 -fno-sanitize-trap=cfi \ 952 -fno-sanitize-blacklist 953 954ifdef CONFIG_CFI_PERMISSIVE 955CC_FLAGS_CFI += -fsanitize-recover=cfi 956endif 957 958# If LTO flags are filtered out, we must also filter out CFI. 959CC_FLAGS_LTO += $(CC_FLAGS_CFI) 960KBUILD_CFLAGS += $(CC_FLAGS_CFI) 961export CC_FLAGS_CFI 962endif 963 964ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 965KBUILD_CFLAGS += -falign-functions=32 966endif 967 968# arch Makefile may override CC so keep this after arch Makefile is included 969NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 970 971# warn about C99 declaration after statement 972KBUILD_CFLAGS += -Wdeclaration-after-statement 973 974# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 975KBUILD_CFLAGS += -Wvla 976 977# disable pointer signed / unsigned warnings in gcc 4.0 978KBUILD_CFLAGS += -Wno-pointer-sign 979 980# disable stringop warnings in gcc 8+ 981KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 982 983# We'll want to enable this eventually, but it's not going away for 5.7 at least 984KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 985KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 986KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 987 988# Another good warning that we'll want to enable eventually 989KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 990 991# Enabled with W=2, disabled by default as noisy 992KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 993 994# disable invalid "can't wrap" optimizations for signed / pointers 995KBUILD_CFLAGS += -fno-strict-overflow 996 997# Make sure -fstack-check isn't enabled (like gentoo apparently did) 998KBUILD_CFLAGS += -fno-stack-check 999 1000# conserve stack if available
1001KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 1002 1003# Prohibit date/time macros, which would make the build non-deterministic 1004KBUILD_CFLAGS += -Werror=date-time 1005 1006# enforce correct pointer usage 1007KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1008 1009# Require designated initializers for all marked structures 1010KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1011 1012# change __FILE__ to the relative path from the srctree 1013KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1014 1015# include additional Makefiles when needed 1016include-y := scripts/Makefile.extrawarn 1017include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1018include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1019include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1020include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1021include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1022 1023include $(addprefix $(srctree)/, $(include-y)) 1024 1025# scripts/Makefile.gcc-plugins is intentionally included last. 1026# Do not add $(call cc-option,...) below this line. When you build the kernel 1027# from the clean source tree, the GCC plugins do not exist at this point. 1028 1029# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1030KBUILD_CPPFLAGS += $(KCPPFLAGS) 1031KBUILD_AFLAGS += $(KAFLAGS) 1032KBUILD_CFLAGS += $(KCFLAGS) 1033 1034KBUILD_LDFLAGS_MODULE += --build-id=sha1 1035LDFLAGS_vmlinux += --build-id=sha1 1036 1037ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1038LDFLAGS_vmlinux += $(call ld-option, -X,) 1039endif 1040 1041ifeq ($(CONFIG_RELR),y) 1042LDFLAGS_vmlinux += --pack-dyn-relocs=relr 1043endif 1044 1045# We never want expected sections to be placed heuristically by the 1046# linker. All sections should be explicitly named in the linker script. 1047ifdef CONFIG_LD_ORPHAN_WARN 1048LDFLAGS_vmlinux += --orphan-handling=warn 1049endif 1050 1051# Align the bit size of userspace programs with the kernel 1052KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1053KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1054 1055# make the checker run with the right architecture 1056CHECKFLAGS += --arch=$(ARCH) 1057 1058# insure the checker run with the right endianness 1059CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1060 1061# the checker needs the correct machine size 1062CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1063 1064# Default kernel image to build when no specific target is given. 1065# KBUILD_IMAGE may be overruled on the command line or 1066# set in the environment 1067# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1068# this default value 1069export KBUILD_IMAGE ?= vmlinux 1070 1071# 1072# INSTALL_PATH specifies where to place the updated kernel and system map 1073# images. Default is /boot, but you can set it to other values 1074export INSTALL_PATH ?= /boot 1075 1076# 1077# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1078# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1079# an argument if needed. Otherwise it defaults to the kernel install path 1080# 1081export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1082 1083# 1084# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1085# relocations required by build roots. This is not defined in the 1086# makefile but the argument can be passed to make if needed. 1087# 1088 1089MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1090export MODLIB 1091 1092HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1093 1094has_libelf = $(call try-run,\ 1095 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1096 1097ifdef CONFIG_STACK_VALIDATION 1098 ifeq ($(has_libelf),1) 1099 objtool_target := tools/objtool FORCE 1100 else 1101 SKIP_STACK_VALIDATION := 1 1102 export SKIP_STACK_VALIDATION 1103 endif 1104endif 1105 1106PHONY += resolve_btfids_clean 1107 1108resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1109 1110# tools/bpf/resolve_btfids directory might not exist 1111# in output directory, skip its clean in that case 1112resolve_btfids_clean: 1113ifneq ($(wildcard $(resolve_btfids_O)),) 1114 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1115endif 1116 1117ifdef CONFIG_BPF 1118ifdef CONFIG_DEBUG_INFO_BTF 1119 ifeq ($(has_libelf),1) 1120 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1121 else 1122 ERROR_RESOLVE_BTFIDS := 1 1123 endif 1124endif # CONFIG_DEBUG_INFO_BTF 1125endif # CONFIG_BPF 1126 1127PHONY += prepare0 1128 1129export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1130export MODORDER := $(extmod_prefix)modules.order 1131export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1132 1133ifeq ($(KBUILD_EXTMOD),) 1134core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1135 1136vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1137 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1138 $(libs-y) $(libs-m))) 1139 1140vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1141 $(patsubst %/,%,$(filter %/, $(core-) \ 1142 $(drivers-) $(libs-)))) 1143 1144subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1145 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1146 $(drivers-y) $(drivers-m))) 1147 1148build-dirs := $(vmlinux-dirs) 1149clean-dirs := $(vmlinux-alldirs) 1150 1151# Externally visible symbols (used by link-vmlinux.sh) 1152KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1153KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1154ifdef CONFIG_MODULES 1155KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1156KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1157else 1158KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1159endif 1160KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1161 1162export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1163export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1164# used by scripts/Makefile.package 1165export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1166 1167vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1168 1169# Recurse until adjust_autoksyms.sh is satisfied 1170PHONY += autoksyms_recursive 1171ifdef CONFIG_TRIM_UNUSED_KSYMS 1172# For the kernel to actually contain only the needed exported symbols, 1173# we have to build modules as well to determine what those symbols are. 1174# (this can be evaluated only once include/config/auto.conf has been included) 1175KBUILD_MODULES := 1 1176 1177autoksyms_recursive: descend modules.order 1178 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1179 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1180endif 1181 1182autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1183 1184quiet_cmd_autoksyms_h = GEN $@ 1185 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1186 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1187 1188$(autoksyms_h): 1189 $(call cmd,autoksyms_h) 1190 1191ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1192 1193# Final link of vmlinux with optional arch pass after final link 1194cmd_link-vmlinux = \ 1195 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1196 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1197 1198vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1199 +$(call if_changed_dep,link-vmlinux) 1200 1201targets := vmlinux 1202 1203# The actual objects are generated when descending, 1204# make sure no implicit rule kicks in 1205$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1206 1207filechk_kernel.release = \ 1208 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1209 1210# Store (new) KERNELRELEASE string in include/config/kernel.release 1211include/config/kernel.release: FORCE 1212 $(call filechk,kernel.release) 1213 1214# Additional helpers built in scripts/ 1215# Carefully list dependencies so we do not try to build scripts twice 1216# in parallel 1217PHONY += scripts 1218scripts: scripts_basic scripts_dtc 1219 $(Q)$(MAKE) $(build)=$(@) 1220 1221# Things we need to do before we recursively start building the kernel 1222# or the modules are listed in "prepare". 1223# A multi level approach is used. prepareN is processed before prepareN-1. 1224# archprepare is used in arch Makefiles and when processed asm symlink, 1225# version.h and scripts_basic is processed / created. 1226 1227PHONY += prepare archprepare 1228 1229archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1230 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1231 include/generated/autoconf.h remove-stale-files 1232 1233prepare0: archprepare 1234 $(Q)$(MAKE) $(build)=scripts/mod 1235 $(Q)$(MAKE) $(build)=. 1236 1237# All the preparing.. 1238prepare: prepare0 prepare-objtool prepare-resolve_btfids 1239 1240PHONY += remove-stale-files 1241remove-stale-files: 1242 $(Q)$(srctree)/scripts/remove-stale-files 1243 1244# Support for using generic headers in asm-generic 1245asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1246 1247PHONY += asm-generic uapi-asm-generic 1248asm-generic: uapi-asm-generic 1249 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1250 generic=include/asm-generic 1251uapi-asm-generic: 1252 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1253 generic=include/uapi/asm-generic 1254 1255PHONY += prepare-objtool prepare-resolve_btfids 1256prepare-objtool: $(objtool_target) 1257ifeq ($(SKIP_STACK_VALIDATION),1) 1258ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1259 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1260 @false 1261endif 1262ifdef CONFIG_UNWINDER_ORC 1263 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1264 @false 1265else 1266 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1267endif 1268endif 1269 1270prepare-resolve_btfids: $(resolve_btfids_target) 1271ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1272 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1273 @false 1274endif 1275# Generate some files 1276# --------------------------------------------------------------------------- 1277 1278# KERNELRELEASE can change from a few different places, meaning version.h 1279# needs to be updated, so this check is forced on all builds 1280 1281uts_len := 64 1282define filechk_utsrelease.h 1283 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1284 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1285 exit 1; \ 1286 fi; \ 1287 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1288endef 1289 1290define filechk_version.h 1291 if [ $(SUBLEVEL) -gt 255 ]; then \ 1292 echo \#define LINUX_VERSION_CODE $(shell \ 1293 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1294 else \ 1295 echo \#define LINUX_VERSION_CODE $(shell \ 1296 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1297 fi; \ 1298 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1299 ((c) > 255 ? 255 : (c)))'; \ 1300 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1301 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1302 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1303endef 1304 1305$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1306$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1307$(version_h): FORCE 1308 $(call filechk,version.h) 1309 1310include/generated/utsrelease.h: include/config/kernel.release FORCE 1311 $(call filechk,utsrelease.h) 1312 1313PHONY += headerdep 1314headerdep: 1315 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1316 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1317 1318# --------------------------------------------------------------------------- 1319# Kernel headers 1320 1321#Default location for installed headers 1322export INSTALL_HDR_PATH = $(objtree)/usr 1323 1324quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1325 cmd_headers_install = \ 1326 mkdir -p $(INSTALL_HDR_PATH); \ 1327 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1328 usr/include $(INSTALL_HDR_PATH) 1329 1330PHONY += headers_install 1331headers_install: headers 1332 $(call cmd,headers_install) 1333 1334PHONY += archheaders archscripts 1335 1336hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1337 1338PHONY += headers 1339headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1340 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1341 $(error Headers not exportable for the $(SRCARCH) architecture)) 1342 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1343 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1344 1345# Deprecated. It is no-op now. 1346PHONY += headers_check 1347headers_check: 1348 @echo >&2 "=================== WARNING ===================" 1349 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1350 @echo >&2 "and will be removed after Linux 5.15 release." 1351 @echo >&2 "Please remove headers_check from your scripts." 1352 @echo >&2 "===============================================" 1353 1354ifdef CONFIG_HEADERS_INSTALL 1355prepare: headers 1356endif 1357 1358PHONY += scripts_unifdef 1359scripts_unifdef: scripts_basic 1360 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1361 1362# --------------------------------------------------------------------------- 1363# Kernel selftest 1364 1365PHONY += kselftest 1366kselftest: 1367 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1368 1369kselftest-%: FORCE 1370 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1371 1372PHONY += kselftest-merge 1373kselftest-merge: 1374 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1375 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1376 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1377 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1378 1379# --------------------------------------------------------------------------- 1380# Devicetree files 1381 1382ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1383dtstree := arch/$(SRCARCH)/boot/dts 1384endif 1385 1386ifneq ($(dtstree),) 1387 1388%.dtb: include/config/kernel.release scripts_dtc 1389 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1390 1391%.dtbo: include/config/kernel.release scripts_dtc 1392 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1393 1394PHONY += dtbs dtbs_install dtbs_check 1395dtbs: include/config/kernel.release scripts_dtc 1396 $(Q)$(MAKE) $(build)=$(dtstree) 1397 1398ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1399export CHECK_DTBS=y 1400dtbs: dt_binding_check 1401endif 1402 1403dtbs_check: dtbs 1404 1405dtbs_install: 1406 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1407 1408ifdef CONFIG_OF_EARLY_FLATTREE 1409all: dtbs 1410endif 1411 1412endif 1413 1414PHONY += scripts_dtc 1415scripts_dtc: scripts_basic 1416 $(Q)$(MAKE) $(build)=scripts/dtc 1417 1418ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1419export CHECK_DT_BINDING=y 1420endif 1421 1422PHONY += dt_binding_check 1423dt_binding_check: scripts_dtc 1424 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1425 1426# --------------------------------------------------------------------------- 1427# Modules 1428 1429ifdef CONFIG_MODULES 1430 1431# By default, build modules as well 1432 1433all: modules 1434 1435# When we're building modules with modversions, we need to consider 1436# the built-in objects during the descend as well, in order to 1437# make sure the checksums are up to date before we record them. 1438ifdef CONFIG_MODVERSIONS 1439 KBUILD_BUILTIN := 1 1440endif 1441 1442# Build modules 1443# 1444# A module can be listed more than once in obj-m resulting in 1445# duplicate lines in modules.order files. Those are removed 1446# using awk while concatenating to the final file. 1447 1448PHONY += modules 1449modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1450 1451cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1452 1453modules.order: $(subdir-modorder) FORCE 1454 $(call if_changed,modules_order) 1455 1456targets += modules.order 1457 1458# Target to prepare building external modules 1459PHONY += modules_prepare 1460modules_prepare: prepare 1461 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1462 1463export modules_sign_only := 1464 1465ifeq ($(CONFIG_MODULE_SIG),y) 1466PHONY += modules_sign 1467modules_sign: modules_install 1468 @: 1469 1470# modules_sign is a subset of modules_install. 1471# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1472ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1473modules_sign_only := y 1474endif 1475endif 1476 1477modinst_pre := 1478ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1479modinst_pre := __modinst_pre 1480endif 1481 1482modules_install: $(modinst_pre) 1483PHONY += __modinst_pre 1484__modinst_pre: 1485 @rm -rf $(MODLIB)/kernel 1486 @rm -f $(MODLIB)/source 1487 @mkdir -p $(MODLIB)/kernel 1488 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1489 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1490 rm -f $(MODLIB)/build ; \ 1491 ln -s $(CURDIR) $(MODLIB)/build ; \ 1492 fi 1493 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1494 @cp -f modules.builtin $(MODLIB)/ 1495 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1496 1497endif # CONFIG_MODULES 1498 1499### 1500# Cleaning is done on three levels. 1501# make clean Delete most generated files 1502# Leave enough to build external modules 1503# make mrproper Delete the current configuration, and all generated files 1504# make distclean Remove editor backup files, patch leftover files and the like 1505 1506# Directories & files removed with 'make clean' 1507CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1508 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1509 compile_commands.json .thinlto-cache 1510 1511# Directories & files removed with 'make mrproper' 1512MRPROPER_FILES += include/config include/generated \ 1513 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1514 debian snap tar-install \ 1515 .config .config.old .version \ 1516 Module.symvers \ 1517 certs/signing_key.pem certs/signing_key.x509 \ 1518 certs/x509.genkey \ 1519 vmlinux-gdb.py \ 1520 *.spec 1521 1522# clean - Delete most, but leave enough to build external modules 1523# 1524clean: rm-files := $(CLEAN_FILES) 1525 1526PHONY += archclean vmlinuxclean 1527 1528vmlinuxclean: 1529 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1530 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1531 1532clean: archclean vmlinuxclean resolve_btfids_clean 1533 1534# mrproper - Delete all generated files, including .config 1535# 1536mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1537mrproper-dirs := $(addprefix _mrproper_,scripts) 1538 1539PHONY += $(mrproper-dirs) mrproper 1540$(mrproper-dirs): 1541 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1542 1543mrproper: clean $(mrproper-dirs) 1544 $(call cmd,rmfiles) 1545 1546# distclean 1547# 1548PHONY += distclean 1549 1550distclean: mrproper 1551 @find . $(RCS_FIND_IGNORE) \ 1552 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1553 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1554 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1555 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1556 -type f -print | xargs rm -f 1557 1558 1559# Packaging of the kernel to various formats 1560# --------------------------------------------------------------------------- 1561 1562%src-pkg: FORCE 1563 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1564%pkg: include/config/kernel.release FORCE 1565 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1566 1567# Brief documentation of the typical targets used 1568# --------------------------------------------------------------------------- 1569 1570boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1571boards := $(sort $(notdir $(boards))) 1572board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1573board-dirs := $(sort $(notdir $(board-dirs:/=))) 1574 1575PHONY += help 1576help: 1577 @echo 'Cleaning targets:' 1578 @echo ' clean - Remove most generated files but keep the config and' 1579 @echo ' enough build support to build external modules' 1580 @echo ' mrproper - Remove all generated files + config + various backup files' 1581 @echo ' distclean - mrproper + remove editor backup and patch files' 1582 @echo '' 1583 @echo 'Configuration targets:' 1584 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1585 @echo '' 1586 @echo 'Other generic targets:' 1587 @echo ' all - Build all targets marked with [*]' 1588 @echo '* vmlinux - Build the bare kernel' 1589 @echo '* modules - Build all modules' 1590 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1591 @echo ' dir/ - Build all files in dir and below' 1592 @echo ' dir/file.[ois] - Build specified target only' 1593 @echo ' dir/file.ll - Build the LLVM assembly file' 1594 @echo ' (requires compiler support for LLVM assembly generation)' 1595 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1596 @echo ' (requires a recent binutils and recent build (System.map))' 1597 @echo ' dir/file.ko - Build module including final link' 1598 @echo ' modules_prepare - Set up for building external modules' 1599 @echo ' tags/TAGS - Generate tags file for editors' 1600 @echo ' cscope - Generate cscope index' 1601 @echo ' gtags - Generate GNU GLOBAL index' 1602 @echo ' kernelrelease - Output the release version string (use with make -s)' 1603 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1604 @echo ' image_name - Output the image name (use with make -s)' 1605 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1606 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1607 echo '' 1608 @echo 'Static analysers:' 1609 @echo ' checkstack - Generate a list of stack hogs' 1610 @echo ' versioncheck - Sanity check on version.h usage' 1611 @echo ' includecheck - Check for duplicate included header files' 1612 @echo ' export_report - List the usages of all exported symbols' 1613 @echo ' headerdep - Detect inclusion cycles in headers' 1614 @echo ' coccicheck - Check with Coccinelle' 1615 @echo ' clang-analyzer - Check with clang static analyzer' 1616 @echo ' clang-tidy - Check with clang-tidy' 1617 @echo '' 1618 @echo 'Tools:' 1619 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1620 @echo '' 1621 @echo 'Kernel selftest:' 1622 @echo ' kselftest - Build and run kernel selftest' 1623 @echo ' Build, install, and boot kernel before' 1624 @echo ' running kselftest on it' 1625 @echo ' Run as root for full coverage' 1626 @echo ' kselftest-all - Build kernel selftest' 1627 @echo ' kselftest-install - Build and install kernel selftest' 1628 @echo ' kselftest-clean - Remove all generated kselftest files' 1629 @echo ' kselftest-merge - Merge all the config dependencies of' 1630 @echo ' kselftest to existing .config.' 1631 @echo '' 1632 @$(if $(dtstree), \ 1633 echo 'Devicetree:'; \ 1634 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1635 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1636 echo ' dt_binding_check - Validate device tree binding documents'; \ 1637 echo ' dtbs_check - Validate device tree source files';\ 1638 echo '') 1639 1640 @echo 'Userspace tools targets:' 1641 @echo ' use "make tools/help"' 1642 @echo ' or "cd tools; make help"' 1643 @echo '' 1644 @echo 'Kernel packaging:' 1645 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1646 @echo '' 1647 @echo 'Documentation targets:' 1648 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1649 @echo '' 1650 @echo 'Architecture specific targets ($(SRCARCH)):' 1651 @$(if $(archhelp),$(archhelp),\ 1652 echo ' No architecture specific help defined for $(SRCARCH)') 1653 @echo '' 1654 @$(if $(boards), \ 1655 $(foreach b, $(boards), \ 1656 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1657 echo '') 1658 @$(if $(board-dirs), \ 1659 $(foreach b, $(board-dirs), \ 1660 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1661 printf " %-16s - Show all of the above\\n" help-boards; \ 1662 echo '') 1663 1664 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1665 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1666 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1667 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1668 @echo ' (sparse by default)' 1669 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1670 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1671 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1672 @echo ' 1: warnings which may be relevant and do not occur too often' 1673 @echo ' 2: warnings which occur quite often but may still be relevant' 1674 @echo ' 3: more obscure warnings, can most likely be ignored' 1675 @echo ' Multiple levels can be combined with W=12 or W=123' 1676 @echo '' 1677 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1678 @echo 'For further info see the ./README file' 1679 1680 1681help-board-dirs := $(addprefix help-,$(board-dirs)) 1682 1683help-boards: $(help-board-dirs) 1684 1685boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1686 1687$(help-board-dirs): help-%: 1688 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1689 @$(if $(boards-per-dir), \ 1690 $(foreach b, $(boards-per-dir), \ 1691 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1692 echo '') 1693 1694 1695# Documentation targets 1696# --------------------------------------------------------------------------- 1697DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1698 linkcheckdocs dochelp refcheckdocs 1699PHONY += $(DOC_TARGETS) 1700$(DOC_TARGETS): 1701 $(Q)$(MAKE) $(build)=Documentation $@ 1702 1703# Misc 1704# --------------------------------------------------------------------------- 1705 1706PHONY += scripts_gdb 1707scripts_gdb: prepare0 1708 $(Q)$(MAKE) $(build)=scripts/gdb 1709 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1710 1711ifdef CONFIG_GDB_SCRIPTS 1712all: scripts_gdb 1713endif 1714 1715else # KBUILD_EXTMOD 1716 1717### 1718# External module support. 1719# When building external modules the kernel used as basis is considered 1720# read-only, and no consistency checks are made and the make 1721# system is not used on the basis kernel. If updates are required 1722# in the basis kernel ordinary make commands (without M=...) must be used. 1723 1724# We are always building only modules. 1725KBUILD_BUILTIN := 1726KBUILD_MODULES := 1 1727 1728build-dirs := $(KBUILD_EXTMOD) 1729$(MODORDER): descend 1730 @: 1731 1732compile_commands.json: $(extmod_prefix)compile_commands.json 1733PHONY += compile_commands.json 1734 1735clean-dirs := $(KBUILD_EXTMOD) 1736clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1737 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1738 1739PHONY += help 1740help: 1741 @echo ' Building external modules.' 1742 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1743 @echo '' 1744 @echo ' modules - default target, build the module(s)' 1745 @echo ' modules_install - install the module' 1746 @echo ' clean - remove generated files in module directory only' 1747 @echo '' 1748 1749# no-op for external module builds 1750PHONY += prepare modules_prepare 1751 1752endif # KBUILD_EXTMOD 1753 1754# --------------------------------------------------------------------------- 1755# Modules 1756 1757PHONY += modules modules_install 1758 1759ifdef CONFIG_MODULES 1760 1761modules: modules_check 1762 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1763 1764PHONY += modules_check 1765modules_check: $(MODORDER) 1766 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1767 1768quiet_cmd_depmod = DEPMOD $(MODLIB) 1769 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1770 $(KERNELRELEASE) 1771 1772modules_install: 1773 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1774 $(call cmd,depmod) 1775 1776else # CONFIG_MODULES 1777 1778# Modules not configured 1779# --------------------------------------------------------------------------- 1780 1781modules modules_install: 1782 @echo >&2 '***' 1783 @echo >&2 '*** The present kernel configuration has modules disabled.' 1784 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1785 @echo >&2 '*** to enable CONFIG_MODULES.' 1786 @echo >&2 '***' 1787 @exit 1 1788 1789endif # CONFIG_MODULES 1790 1791# Single targets 1792# --------------------------------------------------------------------------- 1793# To build individual files in subdirectories, you can do like this: 1794# 1795# make foo/bar/baz.s 1796# 1797# The supported suffixes for single-target are listed in 'single-targets' 1798# 1799# To build only under specific subdirectories, you can do like this: 1800# 1801# make foo/bar/baz/ 1802 1803ifdef single-build 1804 1805# .ko is special because modpost is needed 1806single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1807single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1808 1809$(single-ko): single_modpost 1810 @: 1811$(single-no-ko): descend 1812 @: 1813 1814ifeq ($(KBUILD_EXTMOD),) 1815# For the single build of in-tree modules, use a temporary file to avoid 1816# the situation of modules_install installing an invalid modules.order. 1817MODORDER := .modules.tmp 1818endif 1819 1820PHONY += single_modpost 1821single_modpost: $(single-no-ko) modules_prepare 1822 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1823 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1824 1825KBUILD_MODULES := 1 1826 1827export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1828 1829# trim unrelated directories 1830build-dirs := $(foreach d, $(build-dirs), \ 1831 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1832 1833endif 1834 1835ifndef CONFIG_MODULES 1836KBUILD_MODULES := 1837endif 1838 1839# Handle descending into subdirectories listed in $(build-dirs) 1840# Preset locale variables to speed up the build process. Limit locale 1841# tweaks to this spot to avoid wrong language settings when running 1842# make menuconfig etc. 1843# Error messages still appears in the original language 1844PHONY += descend $(build-dirs) 1845descend: $(build-dirs) 1846$(build-dirs): prepare 1847 $(Q)$(MAKE) $(build)=$@ \ 1848 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1849 need-builtin=1 need-modorder=1 1850 1851clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1852PHONY += $(clean-dirs) clean 1853$(clean-dirs): 1854 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1855 1856clean: $(clean-dirs) 1857 $(call cmd,rmfiles) 1858 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1859 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1860 -o -name '*.ko.*' \ 1861 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1862 -o -name '*.dwo' -o -name '*.lst' \ 1863 -o -name '*.su' -o -name '*.mod' \ 1864 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1865 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1866 -o -name '*.asn1.[ch]' \ 1867 -o -name '*.symtypes' -o -name 'modules.order' \ 1868 -o -name '.tmp_*.o.*' \ 1869 -o -name '*.c.[012]*.*' \ 1870 -o -name '*.ll' \ 1871 -o -name '*.gcno' \ 1872 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1873 1874# Generate tags for editors 1875# --------------------------------------------------------------------------- 1876quiet_cmd_tags = GEN $@ 1877 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1878 1879tags TAGS cscope gtags: FORCE 1880 $(call cmd,tags) 1881 1882# Script to generate missing namespace dependencies 1883# --------------------------------------------------------------------------- 1884 1885PHONY += nsdeps 1886nsdeps: export KBUILD_NSDEPS=1 1887nsdeps: modules 1888 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1889 1890# Clang Tooling 1891# --------------------------------------------------------------------------- 1892 1893quiet_cmd_gen_compile_commands = GEN $@ 1894 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1895 1896$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1897 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1898 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1899 $(call if_changed,gen_compile_commands) 1900 1901targets += $(extmod_prefix)compile_commands.json 1902 1903PHONY += clang-tidy clang-analyzer 1904 1905ifdef CONFIG_CC_IS_CLANG 1906quiet_cmd_clang_tools = CHECK $< 1907 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1908 1909clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1910 $(call cmd,clang_tools) 1911else 1912clang-tidy clang-analyzer: 1913 @echo "$@ requires CC=clang" >&2 1914 @false 1915endif 1916 1917# Scripts to check various things for consistency 1918# --------------------------------------------------------------------------- 1919 1920PHONY += includecheck versioncheck coccicheck export_report 1921 1922includecheck: 1923 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1924 -name '*.[hcS]' -type f -print | sort \ 1925 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1926 1927versioncheck: 1928 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1929 -name '*.[hcS]' -type f -print | sort \ 1930 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1931 1932coccicheck: 1933 $(Q)$(BASH) $(srctree)/scripts/$@ 1934 1935export_report: 1936 $(PERL) $(srctree)/scripts/export_report.pl 1937 1938PHONY += checkstack kernelrelease kernelversion image_name 1939 1940# UML needs a little special treatment here. It wants to use the host 1941# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1942# else wants $(ARCH), including people doing cross-builds, which means 1943# that $(SUBARCH) doesn't work here. 1944ifeq ($(ARCH), um) 1945CHECKSTACK_ARCH := $(SUBARCH) 1946else 1947CHECKSTACK_ARCH := $(ARCH) 1948endif 1949checkstack: 1950 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1951 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1952 1953kernelrelease: 1954 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1955 1956kernelversion: 1957 @echo $(KERNELVERSION) 1958 1959image_name: 1960 @echo $(KBUILD_IMAGE) 1961 1962# Clear a bunch of variables before executing the submake 1963 1964ifeq ($(quiet),silent_) 1965tools_silent=s 1966endif 1967 1968tools/: FORCE 1969 $(Q)mkdir -p $(objtree)/tools 1970 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1971 1972tools/%: FORCE 1973 $(Q)mkdir -p $(objtree)/tools 1974 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1975 1976quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1977 cmd_rmfiles = rm -rf $(rm-files) 1978 1979# read saved command lines for existing targets 1980existing-targets := $(wildcard $(sort $(targets))) 1981 1982-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1983 1984endif # config-build 1985endif # mixed-build 1986endif # need-sub-make 1987 1988PHONY += FORCE 1989FORCE: 1990 1991# Declare the contents of the PHONY variable as phony. We keep that 1992# information in a variable so we can use it in if_changed and friends. 1993.PHONY: $(PHONY) 1994