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