1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 14 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Opossums on Parade 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132# Remove trailing slashes 133ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135endif 136 137export KBUILD_EXTMOD 138 139# Kbuild will save output files in the current working directory. 140# This does not need to match to the root of the kernel source tree. 141# 142# For example, you can do this: 143# 144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145# 146# If you want to save output files in a different location, there are 147# two syntaxes to specify it. 148# 149# 1) O= 150# Use "make O=dir/to/store/output/files/" 151# 152# 2) Set KBUILD_OUTPUT 153# Set the environment variable KBUILD_OUTPUT to point to the output directory. 154# export KBUILD_OUTPUT=dir/to/store/output/files/; make 155# 156# The O= assignment takes precedence over the KBUILD_OUTPUT environment 157# variable. 158 159# Do we want to change the working directory? 160ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162endif 163 164ifneq ($(KBUILD_OUTPUT),) 165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166# expand a shell special character '~'. We use a somewhat tedious way here. 167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168$(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171# $(realpath ...) resolves symlinks 172abs_objtree := $(realpath $(abs_objtree)) 173else 174abs_objtree := $(CURDIR) 175endif # ifneq ($(KBUILD_OUTPUT),) 176 177ifeq ($(abs_objtree),$(CURDIR)) 178# Suppress "Entering directory ..." unless we are changing the work directory. 179MAKEFLAGS += --no-print-directory 180else 181need-sub-make := 1 182endif 183 184this-makefile := $(lastword $(MAKEFILE_LIST)) 185abs_srctree := $(realpath $(dir $(this-makefile))) 186 187ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188$(error source directory cannot contain spaces or colons) 189endif 190 191ifneq ($(abs_srctree),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# This does not become effective immediately because MAKEFLAGS is re-parsed 195# once after the Makefile is read. We need to invoke sub-make. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197need-sub-make := 1 198endif 199 200ifneq ($(filter 3.%,$(MAKE_VERSION)),) 201# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 202# We need to invoke sub-make to avoid implicit rules in the top Makefile. 203need-sub-make := 1 204# Cancel implicit rules for this Makefile. 205$(this-makefile): ; 206endif 207 208export abs_srctree abs_objtree 209export sub_make_done := 1 210 211ifeq ($(need-sub-make),1) 212 213PHONY += $(MAKECMDGOALS) __sub-make 214 215$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 216 @: 217 218# Invoke a second make in the output directory, passing relevant variables 219__sub-make: 220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 221 222endif # need-sub-make 223endif # sub_make_done 224 225# We process the rest of the Makefile if this is the final invocation of make 226ifeq ($(need-sub-make),) 227 228# Do not print "Entering directory ...", 229# but we want to display it when entering to the output directory 230# so that IDEs/editors are able to understand relative filenames. 231MAKEFLAGS += --no-print-directory 232 233ifeq ($(abs_srctree),$(abs_objtree)) 234 # building in the source tree 235 srctree := . 236 building_out_of_srctree := 237else 238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 239 # building in a subdirectory of the source tree 240 srctree := .. 241 else 242 srctree := $(abs_srctree) 243 endif 244 building_out_of_srctree := 1 245endif 246 247ifneq ($(KBUILD_ABS_SRCTREE),) 248srctree := $(abs_srctree) 249endif 250 251objtree := . 252VPATH := $(srctree) 253 254export building_out_of_srctree srctree objtree VPATH 255 256# To make sure we do not include .config for any of the *config targets 257# catch them early, and hand them over to scripts/kconfig/Makefile 258# It is allowed to specify more targets when calling make, including 259# mixing *config targets and build targets. 260# For example 'make oldconfig all'. 261# Detect when mixed targets is specified, and make a second invocation 262# of make so .config is not included in this case either (for *config). 263 264version_h := include/generated/uapi/linux/version.h 265 266clean-targets := %clean mrproper cleandocs 267no-dot-config-targets := $(clean-targets) \ 268 cscope gtags TAGS tags help% %docs check% coccicheck \ 269 $(version_h) headers headers_% archheaders archscripts \ 270 %asm-generic kernelversion %src-pkg dt_binding_check \ 271 outputmakefile 272# Installation targets should not require compiler. Unfortunately, vdso_install 273# is an exception where build artifacts may be updated. This must be fixed. 274no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 275 headers_install modules_install kernelrelease image_name 276no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 277 image_name 278single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 279 280config-build := 281mixed-build := 282need-config := 1 283need-compiler := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 295 need-compiler := 296 endif 297endif 298 299ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 301 may-sync-config := 302 endif 303endif 304 305ifneq ($(KBUILD_EXTMOD),) 306 may-sync-config := 307endif 308 309ifeq ($(KBUILD_EXTMOD),) 310 ifneq ($(filter %config,$(MAKECMDGOALS)),) 311 config-build := 1 312 ifneq ($(words $(MAKECMDGOALS)),1) 313 mixed-build := 1 314 endif 315 endif 316endif 317 318# We cannot build single targets and the others at the same time 319ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 320 single-build := 1 321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 322 mixed-build := 1 323 endif 324endif 325 326# For "make -j clean all", "make -j mrproper defconfig all", etc. 327ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 329 mixed-build := 1 330 endif 331endif 332 333# install and modules_install need also be processed one by one 334ifneq ($(filter install,$(MAKECMDGOALS)),) 335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 336 mixed-build := 1 337 endif 338endif 339 340ifdef mixed-build 341# =========================================================================== 342# We're called with mixed targets (*config and build targets). 343# Handle them one by one. 344 345PHONY += $(MAKECMDGOALS) __build_one_by_one 346 347$(MAKECMDGOALS): __build_one_by_one 348 @: 349 350__build_one_by_one: 351 $(Q)set -e; \ 352 for i in $(MAKECMDGOALS); do \ 353 $(MAKE) -f $(srctree)/Makefile $$i; \ 354 done 355 356else # !mixed-build 357 358include $(srctree)/scripts/Kbuild.include 359 360# Read KERNELRELEASE from include/config/kernel.release (if it exists) 361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 362KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 364 365include $(srctree)/scripts/subarch.include 366 367# Cross compiling and selecting different set of gcc/bin-utils 368# --------------------------------------------------------------------------- 369# 370# When performing cross compilation for other architectures ARCH shall be set 371# to the target architecture. (See arch/* for the possibilities). 372# ARCH can be set during invocation of make: 373# make ARCH=ia64 374# Another way is to have ARCH set in the environment. 375# The default ARCH is the host where make is executed. 376 377# CROSS_COMPILE specify the prefix used for all executables used 378# during compilation. Only gcc and related bin-utils executables 379# are prefixed with $(CROSS_COMPILE). 380# CROSS_COMPILE can be set on the command line 381# make CROSS_COMPILE=ia64-linux- 382# Alternatively CROSS_COMPILE can be set in the environment. 383# Default value for CROSS_COMPILE is not to prefix executables 384# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 385ARCH ?= $(SUBARCH) 386 387# Architecture as present in compile.h 388UTS_MACHINE := $(ARCH) 389SRCARCH := $(ARCH) 390 391# Additional ARCH settings for x86 392ifeq ($(ARCH),i386) 393 SRCARCH := x86 394endif 395ifeq ($(ARCH),x86_64) 396 SRCARCH := x86 397endif 398 399# Additional ARCH settings for sparc 400ifeq ($(ARCH),sparc32) 401 SRCARCH := sparc 402endif 403ifeq ($(ARCH),sparc64) 404 SRCARCH := sparc 405endif 406 407export cross_compiling := 408ifneq ($(SRCARCH),$(SUBARCH)) 409cross_compiling := 1 410endif 411 412KCONFIG_CONFIG ?= .config 413export KCONFIG_CONFIG 414 415# SHELL used by kbuild 416CONFIG_SHELL := sh 417 418HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 419HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 420HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 421 422ifneq ($(LLVM),) 423HOSTCC = clang 424HOSTCXX = clang++ 425else 426HOSTCC = gcc 427HOSTCXX = g++ 428endif 429 430export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 431 -O2 -fomit-frame-pointer -std=gnu89 432export KBUILD_USERLDFLAGS := 433 434KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 435KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 436KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 437KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 438 439# Make variables (CC, etc...) 440CPP = $(CC) -E 441ifneq ($(LLVM),) 442CC = clang 443LD = ld.lld 444AR = llvm-ar 445NM = llvm-nm 446OBJCOPY = llvm-objcopy 447OBJDUMP = llvm-objdump 448READELF = llvm-readelf 449STRIP = llvm-strip 450else 451CC = $(CROSS_COMPILE)gcc 452LD = $(CROSS_COMPILE)ld 453AR = $(CROSS_COMPILE)ar 454NM = $(CROSS_COMPILE)nm 455OBJCOPY = $(CROSS_COMPILE)objcopy 456OBJDUMP = $(CROSS_COMPILE)objdump 457READELF = $(CROSS_COMPILE)readelf 458STRIP = $(CROSS_COMPILE)strip 459endif 460PAHOLE = pahole 461RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 462LEX = flex 463YACC = bison 464AWK = awk 465INSTALLKERNEL := installkernel 466DEPMOD = depmod 467PERL = perl 468PYTHON3 = python3 469CHECK = sparse 470BASH = bash 471KGZIP = gzip 472KBZIP2 = bzip2 473KLZOP = lzop 474LZMA = lzma 475LZ4 = lz4c 476XZ = xz 477ZSTD = zstd 478 479CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 480 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 481NOSTDINC_FLAGS := 482CFLAGS_MODULE = 483AFLAGS_MODULE = 484LDFLAGS_MODULE = 485CFLAGS_KERNEL = 486AFLAGS_KERNEL = 487LDFLAGS_vmlinux = 488 489# Use USERINCLUDE when you must reference the UAPI directories only. 490USERINCLUDE := \ 491 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 492 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 493 -I$(srctree)/include/uapi \ 494 -I$(objtree)/include/generated/uapi \ 495 -include $(srctree)/include/linux/compiler-version.h \ 496 -include $(srctree)/include/linux/kconfig.h 497 498# Use LINUXINCLUDE when you must reference the include/ directory. 499# Needed to be compatible with the O= option 500LINUXINCLUDE := \ 501 -I$(srctree)/arch/$(SRCARCH)/include \ 502 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 503 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 504 -I$(objtree)/include \ 505 $(USERINCLUDE) 506 507KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 508KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 509 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 510 -Werror=implicit-function-declaration -Werror=implicit-int \ 511 -Werror=return-type -Wno-format-security \ 512 -std=gnu89 513KBUILD_CPPFLAGS := -D__KERNEL__ 514KBUILD_AFLAGS_KERNEL := 515KBUILD_CFLAGS_KERNEL := 516KBUILD_AFLAGS_MODULE := -DMODULE 517KBUILD_CFLAGS_MODULE := -DMODULE 518KBUILD_LDFLAGS_MODULE := 519KBUILD_LDFLAGS := 520CLANG_FLAGS := 521 522export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 523export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 524export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 525export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 526export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 527 528export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 529export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 530export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 531export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 532export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 533 534# Files to ignore in find ... statements 535 536export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 537 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 538 -prune -o 539export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 540 --exclude CVS --exclude .pc --exclude .hg --exclude .git 541 542# =========================================================================== 543# Rules shared between *config targets and build targets 544 545# Basic helpers built in scripts/basic/ 546PHONY += scripts_basic 547scripts_basic: 548 $(Q)$(MAKE) $(build)=scripts/basic 549 $(Q)rm -f .tmp_quiet_recordmcount 550 551PHONY += outputmakefile 552ifdef building_out_of_srctree 553# Before starting out-of-tree build, make sure the source tree is clean. 554# outputmakefile generates a Makefile in the output directory, if using a 555# separate output directory. This allows convenient use of make in the 556# output directory. 557# At the same time when output Makefile generated, generate .gitignore to 558# ignore whole output directory 559 560quiet_cmd_makefile = GEN Makefile 561 cmd_makefile = { \ 562 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 563 echo "include $(srctree)/Makefile"; \ 564 } > Makefile 565 566outputmakefile: 567 $(Q)if [ -f $(srctree)/.config -o \ 568 -d $(srctree)/include/config -o \ 569 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 570 echo >&2 "***"; \ 571 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 572 echo >&2 "*** in $(abs_srctree)";\ 573 echo >&2 "***"; \ 574 false; \ 575 fi 576 $(Q)ln -fsn $(srctree) source 577 $(call cmd,makefile) 578 $(Q)test -e .gitignore || \ 579 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 580endif 581 582# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 583# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 584# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 585# and from include/config/auto.conf.cmd to detect the compiler upgrade. 586CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 587 588ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 589ifneq ($(CROSS_COMPILE),) 590CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 591endif 592ifeq ($(LLVM_IAS),1) 593CLANG_FLAGS += -integrated-as 594else 595CLANG_FLAGS += -no-integrated-as 596GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 597CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 598endif 599CLANG_FLAGS += -Werror=unknown-warning-option 600KBUILD_CFLAGS += $(CLANG_FLAGS) 601KBUILD_AFLAGS += $(CLANG_FLAGS) 602export CLANG_FLAGS 603endif 604 605# Include this also for config targets because some architectures need 606# cc-cross-prefix to determine CROSS_COMPILE. 607ifdef need-compiler 608include $(srctree)/scripts/Makefile.compiler 609endif 610 611ifdef config-build 612# =========================================================================== 613# *config targets only - make sure prerequisites are updated, and descend 614# in scripts/kconfig to make the *config target 615 616# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 617# KBUILD_DEFCONFIG may point out an alternative default configuration 618# used for 'make defconfig' 619include $(srctree)/arch/$(SRCARCH)/Makefile 620export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 621 622config: outputmakefile scripts_basic FORCE 623 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 624 625%config: outputmakefile scripts_basic FORCE 626 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 627 628else #!config-build 629# =========================================================================== 630# Build targets only - this includes vmlinux, arch specific targets, clean 631# targets and others. In general all targets except *config targets. 632 633# If building an external module we do not care about the all: rule 634# but instead __all depend on modules 635PHONY += all 636ifeq ($(KBUILD_EXTMOD),) 637__all: all 638else 639__all: modules 640endif 641 642# Decide whether to build built-in, modular, or both. 643# Normally, just do built-in. 644 645KBUILD_MODULES := 646KBUILD_BUILTIN := 1 647 648# If we have only "make modules", don't compile built-in objects. 649ifeq ($(MAKECMDGOALS),modules) 650 KBUILD_BUILTIN := 651endif 652 653# If we have "make <whatever> modules", compile modules 654# in addition to whatever we do anyway. 655# Just "make" or "make all" shall build modules as well 656 657ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 658 KBUILD_MODULES := 1 659endif 660 661ifeq ($(MAKECMDGOALS),) 662 KBUILD_MODULES := 1 663endif 664 665export KBUILD_MODULES KBUILD_BUILTIN 666 667ifdef need-config 668include include/config/auto.conf 669endif 670 671ifeq ($(KBUILD_EXTMOD),) 672# Objects we will link into vmlinux / subdirs we need to visit 673core-y := init/ usr/ arch/$(SRCARCH)/ 674drivers-y := drivers/ sound/ 675drivers-$(CONFIG_SAMPLES) += samples/ 676drivers-$(CONFIG_NET) += net/ 677drivers-y += virt/ 678libs-y := lib/ 679endif # KBUILD_EXTMOD 680 681# The all: target is the default when no target is given on the 682# command line. 683# This allow a user to issue only 'make' to build a kernel including modules 684# Defaults to vmlinux, but the arch makefile usually adds further targets 685all: vmlinux 686 687CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 688 $(call cc-option,-fno-tree-loop-im) \ 689 $(call cc-disable-warning,maybe-uninitialized,) 690export CFLAGS_GCOV 691 692# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 693ifdef CONFIG_FUNCTION_TRACER 694 CC_FLAGS_FTRACE := -pg 695endif 696 697RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 698RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 699RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 700RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 701RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 702RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 703export RETPOLINE_CFLAGS 704export RETPOLINE_VDSO_CFLAGS 705 706include $(srctree)/arch/$(SRCARCH)/Makefile 707 708ifdef need-config 709ifdef may-sync-config 710# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 711# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 712# because some architectures define CROSS_COMPILE there. 713include include/config/auto.conf.cmd 714 715$(KCONFIG_CONFIG): 716 @echo >&2 '***' 717 @echo >&2 '*** Configuration file "$@" not found!' 718 @echo >&2 '***' 719 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 720 @echo >&2 '*** "make menuconfig" or "make xconfig").' 721 @echo >&2 '***' 722 @/bin/false 723 724# The actual configuration files used during the build are stored in 725# include/generated/ and include/config/. Update them if .config is newer than 726# include/config/auto.conf (which mirrors .config). 727# 728# This exploits the 'multi-target pattern rule' trick. 729# The syncconfig should be executed only once to make all the targets. 730# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 731# 732# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 733# so you cannot notice that Kconfig is waiting for the user input. 734%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 735 $(Q)$(kecho) " SYNC $@" 736 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 737else # !may-sync-config 738# External modules and some install targets need include/generated/autoconf.h 739# and include/config/auto.conf but do not care if they are up-to-date. 740# Use auto.conf to trigger the test 741PHONY += include/config/auto.conf 742 743include/config/auto.conf: 744 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 745 echo >&2; \ 746 echo >&2 " ERROR: Kernel configuration is invalid."; \ 747 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 748 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 749 echo >&2 ; \ 750 /bin/false) 751 752endif # may-sync-config 753endif # need-config 754 755KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 756KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 757KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 758KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 759KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 760 761ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 762KBUILD_CFLAGS += -O2 763else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 764KBUILD_CFLAGS += -O3 765else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 766KBUILD_CFLAGS += -Os 767endif 768 769# Tell gcc to never replace conditional load with a non-conditional one 770KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 771KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 772 773ifdef CONFIG_READABLE_ASM 774# Disable optimizations that make assembler listings hard to read. 775# reorder blocks reorders the control in the function 776# ipa clone creates specialized cloned functions 777# partial inlining inlines only parts of functions 778KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 779 $(call cc-option,-fno-ipa-cp-clone,) \ 780 $(call cc-option,-fno-partial-inlining) 781endif 782 783ifneq ($(CONFIG_FRAME_WARN),0) 784KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 785endif 786 787stackp-flags-y := -fno-stack-protector 788stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 789stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 790 791KBUILD_CFLAGS += $(stackp-flags-y) 792 793ifdef CONFIG_CC_IS_CLANG 794KBUILD_CPPFLAGS += -Qunused-arguments 795KBUILD_CFLAGS += -Wno-format-invalid-specifier 796KBUILD_CFLAGS += -Wno-gnu 797# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 798# source of a reference will be _MergedGlobals and not on of the whitelisted names. 799# See modpost pattern 2 800KBUILD_CFLAGS += -mno-global-merge 801else 802 803# Warn about unmarked fall-throughs in switch statement. 804# Disabled for clang while comment to attribute conversion happens and 805# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 806KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,) 807endif 808 809# These warnings generated too much noise in a regular build. 810# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 811KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 812 813KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 814ifdef CONFIG_FRAME_POINTER 815KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 816else 817# Some targets (ARM with Thumb2, for example), can't be built with frame 818# pointers. For those, we don't have FUNCTION_TRACER automatically 819# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 820# incompatible with -fomit-frame-pointer with current GCC, so we don't use 821# -fomit-frame-pointer with FUNCTION_TRACER. 822ifndef CONFIG_FUNCTION_TRACER 823KBUILD_CFLAGS += -fomit-frame-pointer 824endif 825endif 826 827# Initialize all stack variables with a 0xAA pattern. 828ifdef CONFIG_INIT_STACK_ALL_PATTERN 829KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 830endif 831 832# Initialize all stack variables with a zero value. 833ifdef CONFIG_INIT_STACK_ALL_ZERO 834# Future support for zero initialization is still being debated, see 835# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 836# renamed or dropped. 837KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 838KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 839endif 840 841# While VLAs have been removed, GCC produces unreachable stack probes 842# for the randomize_kstack_offset feature. Disable it for all compilers. 843KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 844 845DEBUG_CFLAGS := 846 847# Workaround for GCC versions < 5.0 848# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 849ifdef CONFIG_CC_IS_GCC 850DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 851endif 852 853ifdef CONFIG_DEBUG_INFO 854 855ifdef CONFIG_DEBUG_INFO_SPLIT 856DEBUG_CFLAGS += -gsplit-dwarf 857else 858DEBUG_CFLAGS += -g 859endif 860 861ifneq ($(LLVM_IAS),1) 862KBUILD_AFLAGS += -Wa,-gdwarf-2 863endif 864 865ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 866dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 867dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 868DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 869endif 870 871ifdef CONFIG_DEBUG_INFO_REDUCED 872DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 873 $(call cc-option,-fno-var-tracking) 874endif 875 876ifdef CONFIG_DEBUG_INFO_COMPRESSED 877DEBUG_CFLAGS += -gz=zlib 878KBUILD_AFLAGS += -gz=zlib 879KBUILD_LDFLAGS += --compress-debug-sections=zlib 880endif 881 882endif # CONFIG_DEBUG_INFO 883 884KBUILD_CFLAGS += $(DEBUG_CFLAGS) 885export DEBUG_CFLAGS 886 887ifdef CONFIG_FUNCTION_TRACER 888ifdef CONFIG_FTRACE_MCOUNT_USE_CC 889 CC_FLAGS_FTRACE += -mrecord-mcount 890 ifdef CONFIG_HAVE_NOP_MCOUNT 891 ifeq ($(call cc-option-yn, -mnop-mcount),y) 892 CC_FLAGS_FTRACE += -mnop-mcount 893 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 894 endif 895 endif 896endif 897ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 898 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 899endif 900ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 901 ifdef CONFIG_HAVE_C_RECORDMCOUNT 902 BUILD_C_RECORDMCOUNT := y 903 export BUILD_C_RECORDMCOUNT 904 endif 905endif 906ifdef CONFIG_HAVE_FENTRY 907 ifeq ($(call cc-option-yn, -mfentry),y) 908 CC_FLAGS_FTRACE += -mfentry 909 CC_FLAGS_USING += -DCC_USING_FENTRY 910 endif 911endif 912export CC_FLAGS_FTRACE 913KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 914KBUILD_AFLAGS += $(CC_FLAGS_USING) 915endif 916 917# We trigger additional mismatches with less inlining 918ifdef CONFIG_DEBUG_SECTION_MISMATCH 919KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 920endif 921 922ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 923KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 924LDFLAGS_vmlinux += --gc-sections 925endif 926 927ifdef CONFIG_SHADOW_CALL_STACK 928CC_FLAGS_SCS := -fsanitize=shadow-call-stack 929KBUILD_CFLAGS += $(CC_FLAGS_SCS) 930export CC_FLAGS_SCS 931endif 932 933ifdef CONFIG_LTO_CLANG 934ifdef CONFIG_LTO_CLANG_THIN 935CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 936KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 937else 938CC_FLAGS_LTO := -flto 939endif 940CC_FLAGS_LTO += -fvisibility=hidden 941 942# Limit inlining across translation units to reduce binary size 943KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 944 945# Check for frame size exceeding threshold during prolog/epilog insertion 946# when using lld < 13.0.0. 947ifneq ($(CONFIG_FRAME_WARN),0) 948ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 949KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 950endif 951endif 952endif 953 954ifdef CONFIG_LTO 955KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 956KBUILD_AFLAGS += -fno-lto 957export CC_FLAGS_LTO 958endif 959 960ifdef CONFIG_CFI_CLANG 961CC_FLAGS_CFI := -fsanitize=cfi \ 962 -fsanitize-cfi-cross-dso \ 963 -fno-sanitize-cfi-canonical-jump-tables \ 964 -fno-sanitize-trap=cfi \ 965 -fno-sanitize-blacklist 966 967ifdef CONFIG_CFI_PERMISSIVE 968CC_FLAGS_CFI += -fsanitize-recover=cfi 969endif 970 971# If LTO flags are filtered out, we must also filter out CFI. 972CC_FLAGS_LTO += $(CC_FLAGS_CFI) 973KBUILD_CFLAGS += $(CC_FLAGS_CFI) 974export CC_FLAGS_CFI 975endif 976 977ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 978KBUILD_CFLAGS += -falign-functions=64 979endif 980 981# arch Makefile may override CC so keep this after arch Makefile is included 982NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 983 984# warn about C99 declaration after statement 985KBUILD_CFLAGS += -Wdeclaration-after-statement 986 987# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 988KBUILD_CFLAGS += -Wvla 989 990# disable pointer signed / unsigned warnings in gcc 4.0 991KBUILD_CFLAGS += -Wno-pointer-sign 992 993# disable stringop warnings in gcc 8+ 994KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 995 996# We'll want to enable this eventually, but it's not going away for 5.7 at least 997KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 998KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 999KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1000 1001# Another good warning that we'll want to enable eventually 1002KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1003 1004# Enabled with W=2, disabled by default as noisy 1005KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 1006 1007# disable invalid "can't wrap" optimizations for signed / pointers 1008KBUILD_CFLAGS += -fno-strict-overflow 1009 1010# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1011KBUILD_CFLAGS += -fno-stack-check 1012 1013# conserve stack if available 1014KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 1015 1016# Prohibit date/time macros, which would make the build non-deterministic 1017KBUILD_CFLAGS += -Werror=date-time 1018 1019# enforce correct pointer usage 1020KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1021 1022# Require designated initializers for all marked structures 1023KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1024 1025# change __FILE__ to the relative path from the srctree 1026KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1027 1028# include additional Makefiles when needed 1029include-y := scripts/Makefile.extrawarn 1030include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1031include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1032include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1033include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1034include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1035 1036include $(addprefix $(srctree)/, $(include-y)) 1037 1038# scripts/Makefile.gcc-plugins is intentionally included last. 1039# Do not add $(call cc-option,...) below this line. When you build the kernel 1040# from the clean source tree, the GCC plugins do not exist at this point. 1041 1042# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1043KBUILD_CPPFLAGS += $(KCPPFLAGS) 1044KBUILD_AFLAGS += $(KAFLAGS) 1045KBUILD_CFLAGS += $(KCFLAGS) 1046 1047KBUILD_LDFLAGS_MODULE += --build-id=sha1 1048LDFLAGS_vmlinux += --build-id=sha1 1049 1050ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1051LDFLAGS_vmlinux += $(call ld-option, -X,) 1052endif 1053 1054ifeq ($(CONFIG_RELR),y) 1055LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1056endif 1057 1058# We never want expected sections to be placed heuristically by the 1059# linker. All sections should be explicitly named in the linker script. 1060ifdef CONFIG_LD_ORPHAN_WARN 1061LDFLAGS_vmlinux += --orphan-handling=warn 1062endif 1063 1064# Align the bit size of userspace programs with the kernel 1065KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1066KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1067 1068# make the checker run with the right architecture 1069CHECKFLAGS += --arch=$(ARCH) 1070 1071# insure the checker run with the right endianness 1072CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1073 1074# the checker needs the correct machine size 1075CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1076 1077# Default kernel image to build when no specific target is given. 1078# KBUILD_IMAGE may be overruled on the command line or 1079# set in the environment 1080# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1081# this default value 1082export KBUILD_IMAGE ?= vmlinux 1083 1084# 1085# INSTALL_PATH specifies where to place the updated kernel and system map 1086# images. Default is /boot, but you can set it to other values 1087export INSTALL_PATH ?= /boot 1088 1089# 1090# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1091# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1092# an argument if needed. Otherwise it defaults to the kernel install path 1093# 1094export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1095 1096# 1097# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1098# relocations required by build roots. This is not defined in the 1099# makefile but the argument can be passed to make if needed. 1100# 1101 1102MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1103export MODLIB 1104 1105PHONY += prepare0 1106 1107export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1108export MODORDER := $(extmod_prefix)modules.order 1109export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1110 1111ifeq ($(KBUILD_EXTMOD),) 1112core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1113 1114vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1115 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1116 $(libs-y) $(libs-m))) 1117 1118vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1119 $(patsubst %/,%,$(filter %/, $(core-) \ 1120 $(drivers-) $(libs-)))) 1121 1122subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1123 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1124 $(drivers-y) $(drivers-m))) 1125 1126build-dirs := $(vmlinux-dirs) 1127clean-dirs := $(vmlinux-alldirs) 1128 1129# Externally visible symbols (used by link-vmlinux.sh) 1130KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1131KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1132ifdef CONFIG_MODULES 1133KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1134KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1135else 1136KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1137endif 1138KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1139 1140export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1141export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1142# used by scripts/Makefile.package 1143export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1144 1145vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1146 1147# Recurse until adjust_autoksyms.sh is satisfied 1148PHONY += autoksyms_recursive 1149ifdef CONFIG_TRIM_UNUSED_KSYMS 1150# For the kernel to actually contain only the needed exported symbols, 1151# we have to build modules as well to determine what those symbols are. 1152# (this can be evaluated only once include/config/auto.conf has been included) 1153KBUILD_MODULES := 1 1154 1155autoksyms_recursive: descend modules.order 1156 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1157 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1158endif 1159 1160autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1161 1162quiet_cmd_autoksyms_h = GEN $@ 1163 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1164 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1165 1166$(autoksyms_h): 1167 $(call cmd,autoksyms_h) 1168 1169ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1170 1171# Final link of vmlinux with optional arch pass after final link 1172cmd_link-vmlinux = \ 1173 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1174 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1175 1176vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1177 +$(call if_changed_dep,link-vmlinux) 1178 1179targets := vmlinux 1180 1181# The actual objects are generated when descending, 1182# make sure no implicit rule kicks in 1183$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1184 1185filechk_kernel.release = \ 1186 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1187 1188# Store (new) KERNELRELEASE string in include/config/kernel.release 1189include/config/kernel.release: FORCE 1190 $(call filechk,kernel.release) 1191 1192# Additional helpers built in scripts/ 1193# Carefully list dependencies so we do not try to build scripts twice 1194# in parallel 1195PHONY += scripts 1196scripts: scripts_basic scripts_dtc 1197 $(Q)$(MAKE) $(build)=$(@) 1198 1199# Things we need to do before we recursively start building the kernel 1200# or the modules are listed in "prepare". 1201# A multi level approach is used. prepareN is processed before prepareN-1. 1202# archprepare is used in arch Makefiles and when processed asm symlink, 1203# version.h and scripts_basic is processed / created. 1204 1205PHONY += prepare archprepare 1206 1207archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1208 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1209 include/generated/autoconf.h remove-stale-files 1210 1211prepare0: archprepare 1212 $(Q)$(MAKE) $(build)=scripts/mod 1213 $(Q)$(MAKE) $(build)=. 1214 1215# All the preparing.. 1216prepare: prepare0 1217 1218PHONY += remove-stale-files 1219remove-stale-files: 1220 $(Q)$(srctree)/scripts/remove-stale-files 1221 1222# Support for using generic headers in asm-generic 1223asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1224 1225PHONY += asm-generic uapi-asm-generic 1226asm-generic: uapi-asm-generic 1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1228 generic=include/asm-generic 1229uapi-asm-generic: 1230 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1231 generic=include/uapi/asm-generic 1232 1233# Generate some files 1234# --------------------------------------------------------------------------- 1235 1236# KERNELRELEASE can change from a few different places, meaning version.h 1237# needs to be updated, so this check is forced on all builds 1238 1239uts_len := 64 1240define filechk_utsrelease.h 1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1243 exit 1; \ 1244 fi; \ 1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1246endef 1247 1248define filechk_version.h 1249 if [ $(SUBLEVEL) -gt 255 ]; then \ 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1252 else \ 1253 echo \#define LINUX_VERSION_CODE $(shell \ 1254 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1255 fi; \ 1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1257 ((c) > 255 ? 255 : (c)))'; \ 1258 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1259 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1260 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1261endef 1262 1263$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1264$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1265$(version_h): FORCE 1266 $(call filechk,version.h) 1267 1268include/generated/utsrelease.h: include/config/kernel.release FORCE 1269 $(call filechk,utsrelease.h) 1270 1271PHONY += headerdep 1272headerdep: 1273 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1274 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1275 1276# --------------------------------------------------------------------------- 1277# Kernel headers 1278 1279#Default location for installed headers 1280export INSTALL_HDR_PATH = $(objtree)/usr 1281 1282quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1283 cmd_headers_install = \ 1284 mkdir -p $(INSTALL_HDR_PATH); \ 1285 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1286 usr/include $(INSTALL_HDR_PATH) 1287 1288PHONY += headers_install 1289headers_install: headers 1290 $(call cmd,headers_install) 1291 1292PHONY += archheaders archscripts 1293 1294hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1295 1296PHONY += headers 1297headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1298 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1299 $(error Headers not exportable for the $(SRCARCH) architecture)) 1300 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1301 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1302 1303# Deprecated. It is no-op now. 1304PHONY += headers_check 1305headers_check: 1306 @echo >&2 "=================== WARNING ===================" 1307 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1308 @echo >&2 "and will be removed after Linux 5.15 release." 1309 @echo >&2 "Please remove headers_check from your scripts." 1310 @echo >&2 "===============================================" 1311 1312ifdef CONFIG_HEADERS_INSTALL 1313prepare: headers 1314endif 1315 1316PHONY += scripts_unifdef 1317scripts_unifdef: scripts_basic 1318 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1319 1320# --------------------------------------------------------------------------- 1321# Tools 1322 1323ifdef CONFIG_STACK_VALIDATION 1324prepare: tools/objtool 1325endif 1326 1327ifdef CONFIG_BPF 1328ifdef CONFIG_DEBUG_INFO_BTF 1329prepare: tools/bpf/resolve_btfids 1330endif 1331endif 1332 1333PHONY += resolve_btfids_clean 1334 1335resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1336 1337# tools/bpf/resolve_btfids directory might not exist 1338# in output directory, skip its clean in that case 1339resolve_btfids_clean: 1340ifneq ($(wildcard $(resolve_btfids_O)),) 1341 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1342endif 1343 1344# Clear a bunch of variables before executing the submake 1345ifeq ($(quiet),silent_) 1346tools_silent=s 1347endif 1348 1349tools/: FORCE 1350 $(Q)mkdir -p $(objtree)/tools 1351 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1352 1353tools/%: FORCE 1354 $(Q)mkdir -p $(objtree)/tools 1355 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1356 1357# --------------------------------------------------------------------------- 1358# Kernel selftest 1359 1360PHONY += kselftest 1361kselftest: 1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1363 1364kselftest-%: FORCE 1365 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1366 1367PHONY += kselftest-merge 1368kselftest-merge: 1369 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1370 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1371 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1372 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1373 1374# --------------------------------------------------------------------------- 1375# Devicetree files 1376 1377ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1378dtstree := arch/$(SRCARCH)/boot/dts 1379endif 1380 1381ifneq ($(dtstree),) 1382 1383%.dtb: include/config/kernel.release scripts_dtc 1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1385 1386%.dtbo: include/config/kernel.release scripts_dtc 1387 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1388 1389PHONY += dtbs dtbs_install dtbs_check 1390dtbs: include/config/kernel.release scripts_dtc 1391 $(Q)$(MAKE) $(build)=$(dtstree) 1392 1393ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1394export CHECK_DTBS=y 1395dtbs: dt_binding_check 1396endif 1397 1398dtbs_check: dtbs 1399 1400dtbs_install: 1401 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1402 1403ifdef CONFIG_OF_EARLY_FLATTREE 1404all: dtbs 1405endif 1406 1407endif 1408 1409PHONY += scripts_dtc 1410scripts_dtc: scripts_basic 1411 $(Q)$(MAKE) $(build)=scripts/dtc 1412 1413ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1414export CHECK_DT_BINDING=y 1415endif 1416 1417PHONY += dt_binding_check 1418dt_binding_check: scripts_dtc 1419 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1420 1421# --------------------------------------------------------------------------- 1422# Modules 1423 1424ifdef CONFIG_MODULES 1425 1426# By default, build modules as well 1427 1428all: modules 1429 1430# When we're building modules with modversions, we need to consider 1431# the built-in objects during the descend as well, in order to 1432# make sure the checksums are up to date before we record them. 1433ifdef CONFIG_MODVERSIONS 1434 KBUILD_BUILTIN := 1 1435endif 1436 1437# Build modules 1438# 1439# A module can be listed more than once in obj-m resulting in 1440# duplicate lines in modules.order files. Those are removed 1441# using awk while concatenating to the final file. 1442 1443PHONY += modules 1444modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1445 1446cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1447 1448modules.order: $(subdir-modorder) FORCE 1449 $(call if_changed,modules_order) 1450 1451targets += modules.order 1452 1453# Target to prepare building external modules 1454PHONY += modules_prepare 1455modules_prepare: prepare 1456 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1457 1458export modules_sign_only := 1459 1460ifeq ($(CONFIG_MODULE_SIG),y) 1461PHONY += modules_sign 1462modules_sign: modules_install 1463 @: 1464 1465# modules_sign is a subset of modules_install. 1466# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1467ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1468modules_sign_only := y 1469endif 1470endif 1471 1472modinst_pre := 1473ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1474modinst_pre := __modinst_pre 1475endif 1476 1477modules_install: $(modinst_pre) 1478PHONY += __modinst_pre 1479__modinst_pre: 1480 @rm -rf $(MODLIB)/kernel 1481 @rm -f $(MODLIB)/source 1482 @mkdir -p $(MODLIB)/kernel 1483 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1484 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1485 rm -f $(MODLIB)/build ; \ 1486 ln -s $(CURDIR) $(MODLIB)/build ; \ 1487 fi 1488 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1489 @cp -f modules.builtin $(MODLIB)/ 1490 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1491 1492endif # CONFIG_MODULES 1493 1494### 1495# Cleaning is done on three levels. 1496# make clean Delete most generated files 1497# Leave enough to build external modules 1498# make mrproper Delete the current configuration, and all generated files 1499# make distclean Remove editor backup files, patch leftover files and the like 1500 1501# Directories & files removed with 'make clean' 1502CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1503 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1504 compile_commands.json .thinlto-cache 1505 1506# Directories & files removed with 'make mrproper' 1507MRPROPER_FILES += include/config include/generated \ 1508 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1509 debian snap tar-install \ 1510 .config .config.old .version \ 1511 Module.symvers \ 1512 certs/signing_key.pem certs/signing_key.x509 \ 1513 certs/x509.genkey \ 1514 vmlinux-gdb.py \ 1515 *.spec 1516 1517# clean - Delete most, but leave enough to build external modules 1518# 1519clean: rm-files := $(CLEAN_FILES) 1520 1521PHONY += archclean vmlinuxclean 1522 1523vmlinuxclean: 1524 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1525 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1526 1527clean: archclean vmlinuxclean resolve_btfids_clean 1528 1529# mrproper - Delete all generated files, including .config 1530# 1531mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1532mrproper-dirs := $(addprefix _mrproper_,scripts) 1533 1534PHONY += $(mrproper-dirs) mrproper 1535$(mrproper-dirs): 1536 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1537 1538mrproper: clean $(mrproper-dirs) 1539 $(call cmd,rmfiles) 1540 1541# distclean 1542# 1543PHONY += distclean 1544 1545distclean: mrproper 1546 @find . $(RCS_FIND_IGNORE) \ 1547 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1548 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1549 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1550 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1551 -type f -print | xargs rm -f 1552 1553 1554# Packaging of the kernel to various formats 1555# --------------------------------------------------------------------------- 1556 1557%src-pkg: FORCE 1558 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1559%pkg: include/config/kernel.release FORCE 1560 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1561 1562# Brief documentation of the typical targets used 1563# --------------------------------------------------------------------------- 1564 1565boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1566boards := $(sort $(notdir $(boards))) 1567board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1568board-dirs := $(sort $(notdir $(board-dirs:/=))) 1569 1570PHONY += help 1571help: 1572 @echo 'Cleaning targets:' 1573 @echo ' clean - Remove most generated files but keep the config and' 1574 @echo ' enough build support to build external modules' 1575 @echo ' mrproper - Remove all generated files + config + various backup files' 1576 @echo ' distclean - mrproper + remove editor backup and patch files' 1577 @echo '' 1578 @echo 'Configuration targets:' 1579 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1580 @echo '' 1581 @echo 'Other generic targets:' 1582 @echo ' all - Build all targets marked with [*]' 1583 @echo '* vmlinux - Build the bare kernel' 1584 @echo '* modules - Build all modules' 1585 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1586 @echo ' dir/ - Build all files in dir and below' 1587 @echo ' dir/file.[ois] - Build specified target only' 1588 @echo ' dir/file.ll - Build the LLVM assembly file' 1589 @echo ' (requires compiler support for LLVM assembly generation)' 1590 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1591 @echo ' (requires a recent binutils and recent build (System.map))' 1592 @echo ' dir/file.ko - Build module including final link' 1593 @echo ' modules_prepare - Set up for building external modules' 1594 @echo ' tags/TAGS - Generate tags file for editors' 1595 @echo ' cscope - Generate cscope index' 1596 @echo ' gtags - Generate GNU GLOBAL index' 1597 @echo ' kernelrelease - Output the release version string (use with make -s)' 1598 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1599 @echo ' image_name - Output the image name (use with make -s)' 1600 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1601 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1602 echo '' 1603 @echo 'Static analysers:' 1604 @echo ' checkstack - Generate a list of stack hogs' 1605 @echo ' versioncheck - Sanity check on version.h usage' 1606 @echo ' includecheck - Check for duplicate included header files' 1607 @echo ' export_report - List the usages of all exported symbols' 1608 @echo ' headerdep - Detect inclusion cycles in headers' 1609 @echo ' coccicheck - Check with Coccinelle' 1610 @echo ' clang-analyzer - Check with clang static analyzer' 1611 @echo ' clang-tidy - Check with clang-tidy' 1612 @echo '' 1613 @echo 'Tools:' 1614 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1615 @echo '' 1616 @echo 'Kernel selftest:' 1617 @echo ' kselftest - Build and run kernel selftest' 1618 @echo ' Build, install, and boot kernel before' 1619 @echo ' running kselftest on it' 1620 @echo ' Run as root for full coverage' 1621 @echo ' kselftest-all - Build kernel selftest' 1622 @echo ' kselftest-install - Build and install kernel selftest' 1623 @echo ' kselftest-clean - Remove all generated kselftest files' 1624 @echo ' kselftest-merge - Merge all the config dependencies of' 1625 @echo ' kselftest to existing .config.' 1626 @echo '' 1627 @$(if $(dtstree), \ 1628 echo 'Devicetree:'; \ 1629 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1630 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1631 echo ' dt_binding_check - Validate device tree binding documents'; \ 1632 echo ' dtbs_check - Validate device tree source files';\ 1633 echo '') 1634 1635 @echo 'Userspace tools targets:' 1636 @echo ' use "make tools/help"' 1637 @echo ' or "cd tools; make help"' 1638 @echo '' 1639 @echo 'Kernel packaging:' 1640 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1641 @echo '' 1642 @echo 'Documentation targets:' 1643 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1644 @echo '' 1645 @echo 'Architecture specific targets ($(SRCARCH)):' 1646 @$(if $(archhelp),$(archhelp),\ 1647 echo ' No architecture specific help defined for $(SRCARCH)') 1648 @echo '' 1649 @$(if $(boards), \ 1650 $(foreach b, $(boards), \ 1651 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1652 echo '') 1653 @$(if $(board-dirs), \ 1654 $(foreach b, $(board-dirs), \ 1655 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1656 printf " %-16s - Show all of the above\\n" help-boards; \ 1657 echo '') 1658 1659 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1660 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1661 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1662 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1663 @echo ' (sparse by default)' 1664 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1665 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1666 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1667 @echo ' 1: warnings which may be relevant and do not occur too often' 1668 @echo ' 2: warnings which occur quite often but may still be relevant' 1669 @echo ' 3: more obscure warnings, can most likely be ignored' 1670 @echo ' Multiple levels can be combined with W=12 or W=123' 1671 @echo '' 1672 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1673 @echo 'For further info see the ./README file' 1674 1675 1676help-board-dirs := $(addprefix help-,$(board-dirs)) 1677 1678help-boards: $(help-board-dirs) 1679 1680boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1681 1682$(help-board-dirs): help-%: 1683 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1684 @$(if $(boards-per-dir), \ 1685 $(foreach b, $(boards-per-dir), \ 1686 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1687 echo '') 1688 1689 1690# Documentation targets 1691# --------------------------------------------------------------------------- 1692DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1693 linkcheckdocs dochelp refcheckdocs 1694PHONY += $(DOC_TARGETS) 1695$(DOC_TARGETS): 1696 $(Q)$(MAKE) $(build)=Documentation $@ 1697 1698# Misc 1699# --------------------------------------------------------------------------- 1700 1701PHONY += scripts_gdb 1702scripts_gdb: prepare0 1703 $(Q)$(MAKE) $(build)=scripts/gdb 1704 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1705 1706ifdef CONFIG_GDB_SCRIPTS 1707all: scripts_gdb 1708endif 1709 1710else # KBUILD_EXTMOD 1711 1712### 1713# External module support. 1714# When building external modules the kernel used as basis is considered 1715# read-only, and no consistency checks are made and the make 1716# system is not used on the basis kernel. If updates are required 1717# in the basis kernel ordinary make commands (without M=...) must be used. 1718 1719# We are always building only modules. 1720KBUILD_BUILTIN := 1721KBUILD_MODULES := 1 1722 1723build-dirs := $(KBUILD_EXTMOD) 1724$(MODORDER): descend 1725 @: 1726 1727compile_commands.json: $(extmod_prefix)compile_commands.json 1728PHONY += compile_commands.json 1729 1730clean-dirs := $(KBUILD_EXTMOD) 1731clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1732 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1733 1734PHONY += help 1735help: 1736 @echo ' Building external modules.' 1737 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1738 @echo '' 1739 @echo ' modules - default target, build the module(s)' 1740 @echo ' modules_install - install the module' 1741 @echo ' clean - remove generated files in module directory only' 1742 @echo '' 1743 1744# no-op for external module builds 1745PHONY += prepare modules_prepare 1746 1747endif # KBUILD_EXTMOD 1748 1749# --------------------------------------------------------------------------- 1750# Modules 1751 1752PHONY += modules modules_install 1753 1754ifdef CONFIG_MODULES 1755 1756modules: modules_check 1757 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1758 1759PHONY += modules_check 1760modules_check: $(MODORDER) 1761 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1762 1763quiet_cmd_depmod = DEPMOD $(MODLIB) 1764 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1765 $(KERNELRELEASE) 1766 1767modules_install: 1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1769 $(call cmd,depmod) 1770 1771else # CONFIG_MODULES 1772 1773# Modules not configured 1774# --------------------------------------------------------------------------- 1775 1776modules modules_install: 1777 @echo >&2 '***' 1778 @echo >&2 '*** The present kernel configuration has modules disabled.' 1779 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1780 @echo >&2 '*** to enable CONFIG_MODULES.' 1781 @echo >&2 '***' 1782 @exit 1 1783 1784endif # CONFIG_MODULES 1785 1786# Single targets 1787# --------------------------------------------------------------------------- 1788# To build individual files in subdirectories, you can do like this: 1789# 1790# make foo/bar/baz.s 1791# 1792# The supported suffixes for single-target are listed in 'single-targets' 1793# 1794# To build only under specific subdirectories, you can do like this: 1795# 1796# make foo/bar/baz/ 1797 1798ifdef single-build 1799 1800# .ko is special because modpost is needed 1801single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1802single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1803 1804$(single-ko): single_modpost 1805 @: 1806$(single-no-ko): descend 1807 @: 1808 1809ifeq ($(KBUILD_EXTMOD),) 1810# For the single build of in-tree modules, use a temporary file to avoid 1811# the situation of modules_install installing an invalid modules.order. 1812MODORDER := .modules.tmp 1813endif 1814 1815PHONY += single_modpost 1816single_modpost: $(single-no-ko) modules_prepare 1817 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1818 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1819 1820KBUILD_MODULES := 1 1821 1822export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1823 1824# trim unrelated directories 1825build-dirs := $(foreach d, $(build-dirs), \ 1826 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1827 1828endif 1829 1830ifndef CONFIG_MODULES 1831KBUILD_MODULES := 1832endif 1833 1834# Handle descending into subdirectories listed in $(build-dirs) 1835# Preset locale variables to speed up the build process. Limit locale 1836# tweaks to this spot to avoid wrong language settings when running 1837# make menuconfig etc. 1838# Error messages still appears in the original language 1839PHONY += descend $(build-dirs) 1840descend: $(build-dirs) 1841$(build-dirs): prepare 1842 $(Q)$(MAKE) $(build)=$@ \ 1843 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1844 need-builtin=1 need-modorder=1 1845 1846clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1847PHONY += $(clean-dirs) clean 1848$(clean-dirs): 1849 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1850 1851clean: $(clean-dirs) 1852 $(call cmd,rmfiles) 1853 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1854 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1855 -o -name '*.ko.*' \ 1856 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1857 -o -name '*.dwo' -o -name '*.lst' \ 1858 -o -name '*.su' -o -name '*.mod' \ 1859 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1860 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1861 -o -name '*.asn1.[ch]' \ 1862 -o -name '*.symtypes' -o -name 'modules.order' \ 1863 -o -name '.tmp_*.o.*' \ 1864 -o -name '*.c.[012]*.*' \ 1865 -o -name '*.ll' \ 1866 -o -name '*.gcno' \ 1867 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1868 1869# Generate tags for editors 1870# --------------------------------------------------------------------------- 1871quiet_cmd_tags = GEN $@ 1872 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1873 1874tags TAGS cscope gtags: FORCE 1875 $(call cmd,tags) 1876 1877# Script to generate missing namespace dependencies 1878# --------------------------------------------------------------------------- 1879 1880PHONY += nsdeps 1881nsdeps: export KBUILD_NSDEPS=1 1882nsdeps: modules 1883 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1884 1885# Clang Tooling 1886# --------------------------------------------------------------------------- 1887 1888quiet_cmd_gen_compile_commands = GEN $@ 1889 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1890 1891$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1892 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1893 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1894 $(call if_changed,gen_compile_commands) 1895 1896targets += $(extmod_prefix)compile_commands.json 1897 1898PHONY += clang-tidy clang-analyzer 1899 1900ifdef CONFIG_CC_IS_CLANG 1901quiet_cmd_clang_tools = CHECK $< 1902 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1903 1904clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1905 $(call cmd,clang_tools) 1906else 1907clang-tidy clang-analyzer: 1908 @echo "$@ requires CC=clang" >&2 1909 @false 1910endif 1911 1912# Scripts to check various things for consistency 1913# --------------------------------------------------------------------------- 1914 1915PHONY += includecheck versioncheck coccicheck export_report 1916 1917includecheck: 1918 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1919 -name '*.[hcS]' -type f -print | sort \ 1920 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1921 1922versioncheck: 1923 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1924 -name '*.[hcS]' -type f -print | sort \ 1925 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1926 1927coccicheck: 1928 $(Q)$(BASH) $(srctree)/scripts/$@ 1929 1930export_report: 1931 $(PERL) $(srctree)/scripts/export_report.pl 1932 1933PHONY += checkstack kernelrelease kernelversion image_name 1934 1935# UML needs a little special treatment here. It wants to use the host 1936# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1937# else wants $(ARCH), including people doing cross-builds, which means 1938# that $(SUBARCH) doesn't work here. 1939ifeq ($(ARCH), um) 1940CHECKSTACK_ARCH := $(SUBARCH) 1941else 1942CHECKSTACK_ARCH := $(ARCH) 1943endif 1944checkstack: 1945 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1946 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1947 1948kernelrelease: 1949 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1950 1951kernelversion: 1952 @echo $(KERNELVERSION) 1953 1954image_name: 1955 @echo $(KBUILD_IMAGE) 1956 1957quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1958 cmd_rmfiles = rm -rf $(rm-files) 1959 1960# read saved command lines for existing targets 1961existing-targets := $(wildcard $(sort $(targets))) 1962 1963-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1964 1965endif # config-build 1966endif # mixed-build 1967endif # need-sub-make 1968 1969PHONY += FORCE 1970FORCE: 1971 1972# Declare the contents of the PHONY variable as phony. We keep that 1973# information in a variable so we can use it in if_changed and friends. 1974.PHONY: $(PHONY) 1975