1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc3 6NAME = Frozen Wasteland 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132export KBUILD_EXTMOD 133 134# Kbuild will save output files in the current working directory. 135# This does not need to match to the root of the kernel source tree. 136# 137# For example, you can do this: 138# 139# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 140# 141# If you want to save output files in a different location, there are 142# two syntaxes to specify it. 143# 144# 1) O= 145# Use "make O=dir/to/store/output/files/" 146# 147# 2) Set KBUILD_OUTPUT 148# Set the environment variable KBUILD_OUTPUT to point to the output directory. 149# export KBUILD_OUTPUT=dir/to/store/output/files/; make 150# 151# The O= assignment takes precedence over the KBUILD_OUTPUT environment 152# variable. 153 154# Do we want to change the working directory? 155ifeq ("$(origin O)", "command line") 156 KBUILD_OUTPUT := $(O) 157endif 158 159ifneq ($(KBUILD_OUTPUT),) 160# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 161# expand a shell special character '~'. We use a somewhat tedious way here. 162abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 163$(if $(abs_objtree),, \ 164 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 165 166# $(realpath ...) resolves symlinks 167abs_objtree := $(realpath $(abs_objtree)) 168else 169abs_objtree := $(CURDIR) 170endif # ifneq ($(KBUILD_OUTPUT),) 171 172ifeq ($(abs_objtree),$(CURDIR)) 173# Suppress "Entering directory ..." unless we are changing the work directory. 174MAKEFLAGS += --no-print-directory 175else 176need-sub-make := 1 177endif 178 179this-makefile := $(lastword $(MAKEFILE_LIST)) 180abs_srctree := $(realpath $(dir $(this-makefile))) 181 182ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 183$(error source directory cannot contain spaces or colons) 184endif 185 186ifneq ($(abs_srctree),$(abs_objtree)) 187# Look for make include files relative to root of kernel src 188# 189# This does not become effective immediately because MAKEFLAGS is re-parsed 190# once after the Makefile is read. We need to invoke sub-make. 191MAKEFLAGS += --include-dir=$(abs_srctree) 192need-sub-make := 1 193endif 194 195ifneq ($(filter 3.%,$(MAKE_VERSION)),) 196# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 197# We need to invoke sub-make to avoid implicit rules in the top Makefile. 198need-sub-make := 1 199# Cancel implicit rules for this Makefile. 200$(this-makefile): ; 201endif 202 203export abs_srctree abs_objtree 204export sub_make_done := 1 205 206ifeq ($(need-sub-make),1) 207 208PHONY += $(MAKECMDGOALS) __sub-make 209 210$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 211 @: 212 213# Invoke a second make in the output directory, passing relevant variables 214__sub-make: 215 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 216 217endif # need-sub-make 218endif # sub_make_done 219 220# We process the rest of the Makefile if this is the final invocation of make 221ifeq ($(need-sub-make),) 222 223# Do not print "Entering directory ...", 224# but we want to display it when entering to the output directory 225# so that IDEs/editors are able to understand relative filenames. 226MAKEFLAGS += --no-print-directory 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260 261clean-targets := %clean mrproper cleandocs 262no-dot-config-targets := $(clean-targets) \ 263 cscope gtags TAGS tags help% %docs check% coccicheck \ 264 $(version_h) headers headers_% archheaders archscripts \ 265 %asm-generic kernelversion %src-pkg dt_binding_check \ 266 outputmakefile 267# Installation targets should not require compiler. Unfortunately, vdso_install 268# is an exception where build artifacts may be updated. This must be fixed. 269no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 270 headers_install modules_install kernelrelease image_name 271no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 272 image_name 273single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 274 275config-build := 276mixed-build := 277need-config := 1 278need-compiler := 1 279may-sync-config := 1 280single-build := 281 282ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 283 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 284 need-config := 285 endif 286endif 287 288ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 289 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 290 need-compiler := 291 endif 292endif 293 294ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 296 may-sync-config := 297 endif 298endif 299 300ifneq ($(KBUILD_EXTMOD),) 301 may-sync-config := 302endif 303 304ifeq ($(KBUILD_EXTMOD),) 305 ifneq ($(filter %config,$(MAKECMDGOALS)),) 306 config-build := 1 307 ifneq ($(words $(MAKECMDGOALS)),1) 308 mixed-build := 1 309 endif 310 endif 311endif 312 313# We cannot build single targets and the others at the same time 314ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 315 single-build := 1 316 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 317 mixed-build := 1 318 endif 319endif 320 321# For "make -j clean all", "make -j mrproper defconfig all", etc. 322ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 323 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 324 mixed-build := 1 325 endif 326endif 327 328# install and modules_install need also be processed one by one 329ifneq ($(filter install,$(MAKECMDGOALS)),) 330 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 331 mixed-build := 1 332 endif 333endif 334 335ifdef mixed-build 336# =========================================================================== 337# We're called with mixed targets (*config and build targets). 338# Handle them one by one. 339 340PHONY += $(MAKECMDGOALS) __build_one_by_one 341 342$(MAKECMDGOALS): __build_one_by_one 343 @: 344 345__build_one_by_one: 346 $(Q)set -e; \ 347 for i in $(MAKECMDGOALS); do \ 348 $(MAKE) -f $(srctree)/Makefile $$i; \ 349 done 350 351else # !mixed-build 352 353include $(srctree)/scripts/Kbuild.include 354 355# Read KERNELRELEASE from include/config/kernel.release (if it exists) 356KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 357KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 358export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 359 360include $(srctree)/scripts/subarch.include 361 362# Cross compiling and selecting different set of gcc/bin-utils 363# --------------------------------------------------------------------------- 364# 365# When performing cross compilation for other architectures ARCH shall be set 366# to the target architecture. (See arch/* for the possibilities). 367# ARCH can be set during invocation of make: 368# make ARCH=ia64 369# Another way is to have ARCH set in the environment. 370# The default ARCH is the host where make is executed. 371 372# CROSS_COMPILE specify the prefix used for all executables used 373# during compilation. Only gcc and related bin-utils executables 374# are prefixed with $(CROSS_COMPILE). 375# CROSS_COMPILE can be set on the command line 376# make CROSS_COMPILE=ia64-linux- 377# Alternatively CROSS_COMPILE can be set in the environment. 378# Default value for CROSS_COMPILE is not to prefix executables 379# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 380ARCH ?= $(SUBARCH) 381 382# Architecture as present in compile.h 383UTS_MACHINE := $(ARCH) 384SRCARCH := $(ARCH) 385 386# Additional ARCH settings for x86 387ifeq ($(ARCH),i386) 388 SRCARCH := x86 389endif 390ifeq ($(ARCH),x86_64) 391 SRCARCH := x86 392endif 393 394# Additional ARCH settings for sparc 395ifeq ($(ARCH),sparc32) 396 SRCARCH := sparc 397endif 398ifeq ($(ARCH),sparc64) 399 SRCARCH := sparc 400endif 401 402# Additional ARCH settings for sh 403ifeq ($(ARCH),sh64) 404 SRCARCH := sh 405endif 406 407KCONFIG_CONFIG ?= .config 408export KCONFIG_CONFIG 409 410# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 411export KBUILD_DEFCONFIG := defconfig 412 413# SHELL used by kbuild 414CONFIG_SHELL := sh 415 416HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 417HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 418HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 419 420ifneq ($(LLVM),) 421HOSTCC = clang 422HOSTCXX = clang++ 423else 424HOSTCC = gcc 425HOSTCXX = g++ 426endif 427 428export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 429 -O2 -fomit-frame-pointer -std=gnu89 430export KBUILD_USERLDFLAGS := 431 432KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 433KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 434KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 435KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 436 437# Make variables (CC, etc...) 438CPP = $(CC) -E 439ifneq ($(LLVM),) 440CC = clang 441LD = ld.lld 442AR = llvm-ar 443NM = llvm-nm 444OBJCOPY = llvm-objcopy 445OBJDUMP = llvm-objdump 446READELF = llvm-readelf 447STRIP = llvm-strip 448else 449CC = $(CROSS_COMPILE)gcc 450LD = $(CROSS_COMPILE)ld 451AR = $(CROSS_COMPILE)ar 452NM = $(CROSS_COMPILE)nm 453OBJCOPY = $(CROSS_COMPILE)objcopy 454OBJDUMP = $(CROSS_COMPILE)objdump 455READELF = $(CROSS_COMPILE)readelf 456STRIP = $(CROSS_COMPILE)strip 457endif 458PAHOLE = pahole 459RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 460LEX = flex 461YACC = bison 462AWK = awk 463INSTALLKERNEL := installkernel 464DEPMOD = depmod 465PERL = perl 466PYTHON3 = python3 467CHECK = sparse 468BASH = bash 469KGZIP = gzip 470KBZIP2 = bzip2 471KLZOP = lzop 472LZMA = lzma 473LZ4 = lz4c 474XZ = xz 475ZSTD = zstd 476 477CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 478 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 479NOSTDINC_FLAGS := 480CFLAGS_MODULE = 481AFLAGS_MODULE = 482LDFLAGS_MODULE = 483CFLAGS_KERNEL = 484AFLAGS_KERNEL = 485LDFLAGS_vmlinux = 486 487# Use USERINCLUDE when you must reference the UAPI directories only. 488USERINCLUDE := \ 489 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 490 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 491 -I$(srctree)/include/uapi \ 492 -I$(objtree)/include/generated/uapi \ 493 -include $(srctree)/include/linux/compiler-version.h \ 494 -include $(srctree)/include/linux/kconfig.h 495 496# Use LINUXINCLUDE when you must reference the include/ directory. 497# Needed to be compatible with the O= option 498LINUXINCLUDE := \ 499 -I$(srctree)/arch/$(SRCARCH)/include \ 500 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 501 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 502 -I$(objtree)/include \ 503 $(USERINCLUDE) 504 505KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 506KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 507 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 508 -Werror=implicit-function-declaration -Werror=implicit-int \ 509 -Werror=return-type -Wno-format-security \ 510 -std=gnu89 511KBUILD_CPPFLAGS := -D__KERNEL__ 512KBUILD_AFLAGS_KERNEL := 513KBUILD_CFLAGS_KERNEL := 514KBUILD_AFLAGS_MODULE := -DMODULE 515KBUILD_CFLAGS_MODULE := -DMODULE 516KBUILD_LDFLAGS_MODULE := 517KBUILD_LDFLAGS := 518CLANG_FLAGS := 519 520export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 521export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 522export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 523export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 524export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 525 526export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 527export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 528export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 529export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 530export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 531 532# Files to ignore in find ... statements 533 534export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 535 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 536 -prune -o 537export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 538 --exclude CVS --exclude .pc --exclude .hg --exclude .git 539 540# =========================================================================== 541# Rules shared between *config targets and build targets 542 543# Basic helpers built in scripts/basic/ 544PHONY += scripts_basic 545scripts_basic: 546 $(Q)$(MAKE) $(build)=scripts/basic 547 $(Q)rm -f .tmp_quiet_recordmcount 548 549PHONY += outputmakefile 550# Before starting out-of-tree build, make sure the source tree is clean. 551# outputmakefile generates a Makefile in the output directory, if using a 552# separate output directory. This allows convenient use of make in the 553# output directory. 554# At the same time when output Makefile generated, generate .gitignore to 555# ignore whole output directory 556outputmakefile: 557ifdef building_out_of_srctree 558 $(Q)if [ -f $(srctree)/.config -o \ 559 -d $(srctree)/include/config -o \ 560 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 561 echo >&2 "***"; \ 562 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 563 echo >&2 "*** in $(abs_srctree)";\ 564 echo >&2 "***"; \ 565 false; \ 566 fi 567 $(Q)ln -fsn $(srctree) source 568 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 569 $(Q)test -e .gitignore || \ 570 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 571endif 572 573# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 574# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 575# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 576# and from include/config/auto.conf.cmd to detect the compiler upgrade. 577CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 578 579ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 580ifneq ($(CROSS_COMPILE),) 581CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 582endif 583ifeq ($(LLVM_IAS),1) 584CLANG_FLAGS += -integrated-as 585else 586CLANG_FLAGS += -no-integrated-as 587GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 588CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 589endif 590CLANG_FLAGS += -Werror=unknown-warning-option 591KBUILD_CFLAGS += $(CLANG_FLAGS) 592KBUILD_AFLAGS += $(CLANG_FLAGS) 593export CLANG_FLAGS 594endif 595 596# Include this also for config targets because some architectures need 597# cc-cross-prefix to determine CROSS_COMPILE. 598ifdef need-compiler 599include $(srctree)/scripts/Makefile.compiler 600endif 601 602ifdef config-build 603# =========================================================================== 604# *config targets only - make sure prerequisites are updated, and descend 605# in scripts/kconfig to make the *config target 606 607# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 608# KBUILD_DEFCONFIG may point out an alternative default configuration 609# used for 'make defconfig' 610include $(srctree)/arch/$(SRCARCH)/Makefile 611export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 612 613config: outputmakefile scripts_basic FORCE 614 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 615 616%config: outputmakefile scripts_basic FORCE 617 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 618 619else #!config-build 620# =========================================================================== 621# Build targets only - this includes vmlinux, arch specific targets, clean 622# targets and others. In general all targets except *config targets. 623 624# If building an external module we do not care about the all: rule 625# but instead __all depend on modules 626PHONY += all 627ifeq ($(KBUILD_EXTMOD),) 628__all: all 629else 630__all: modules 631endif 632 633# Decide whether to build built-in, modular, or both. 634# Normally, just do built-in. 635 636KBUILD_MODULES := 637KBUILD_BUILTIN := 1 638 639# If we have only "make modules", don't compile built-in objects. 640ifeq ($(MAKECMDGOALS),modules) 641 KBUILD_BUILTIN := 642endif 643 644# If we have "make <whatever> modules", compile modules 645# in addition to whatever we do anyway. 646# Just "make" or "make all" shall build modules as well 647 648ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 649 KBUILD_MODULES := 1 650endif 651 652ifeq ($(MAKECMDGOALS),) 653 KBUILD_MODULES := 1 654endif 655 656export KBUILD_MODULES KBUILD_BUILTIN 657 658ifdef need-config 659include include/config/auto.conf 660endif 661 662ifeq ($(KBUILD_EXTMOD),) 663# Objects we will link into vmlinux / subdirs we need to visit 664core-y := init/ usr/ 665drivers-y := drivers/ sound/ 666drivers-$(CONFIG_SAMPLES) += samples/ 667drivers-$(CONFIG_NET) += net/ 668drivers-y += virt/ 669libs-y := lib/ 670endif # KBUILD_EXTMOD 671 672# The all: target is the default when no target is given on the 673# command line. 674# This allow a user to issue only 'make' to build a kernel including modules 675# Defaults to vmlinux, but the arch makefile usually adds further targets 676all: vmlinux 677 678CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 679 $(call cc-option,-fno-tree-loop-im) \ 680 $(call cc-disable-warning,maybe-uninitialized,) 681export CFLAGS_GCOV 682 683# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 684ifdef CONFIG_FUNCTION_TRACER 685 CC_FLAGS_FTRACE := -pg 686endif 687 688RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 689RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 690RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 691RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 692RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 693RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 694export RETPOLINE_CFLAGS 695export RETPOLINE_VDSO_CFLAGS 696 697include $(srctree)/arch/$(SRCARCH)/Makefile 698 699ifdef need-config 700ifdef may-sync-config 701# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 702# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 703# because some architectures define CROSS_COMPILE there. 704include include/config/auto.conf.cmd 705 706$(KCONFIG_CONFIG): 707 @echo >&2 '***' 708 @echo >&2 '*** Configuration file "$@" not found!' 709 @echo >&2 '***' 710 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 711 @echo >&2 '*** "make menuconfig" or "make xconfig").' 712 @echo >&2 '***' 713 @/bin/false 714 715# The actual configuration files used during the build are stored in 716# include/generated/ and include/config/. Update them if .config is newer than 717# include/config/auto.conf (which mirrors .config). 718# 719# This exploits the 'multi-target pattern rule' trick. 720# The syncconfig should be executed only once to make all the targets. 721# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 722quiet_cmd_syncconfig = SYNC $@ 723 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 724 725%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 726 +$(call cmd,syncconfig) 727else # !may-sync-config 728# External modules and some install targets need include/generated/autoconf.h 729# and include/config/auto.conf but do not care if they are up-to-date. 730# Use auto.conf to trigger the test 731PHONY += include/config/auto.conf 732 733include/config/auto.conf: 734 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 735 echo >&2; \ 736 echo >&2 " ERROR: Kernel configuration is invalid."; \ 737 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 738 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 739 echo >&2 ; \ 740 /bin/false) 741 742endif # may-sync-config 743endif # need-config 744 745KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 746KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 747KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 748KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 749KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 750 751ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 752KBUILD_CFLAGS += -O2 753else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 754KBUILD_CFLAGS += -O3 755else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 756KBUILD_CFLAGS += -Os 757endif 758 759# Tell gcc to never replace conditional load with a non-conditional one 760KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 761KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 762 763ifdef CONFIG_READABLE_ASM 764# Disable optimizations that make assembler listings hard to read. 765# reorder blocks reorders the control in the function 766# ipa clone creates specialized cloned functions 767# partial inlining inlines only parts of functions 768KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 769 $(call cc-option,-fno-ipa-cp-clone,) \ 770 $(call cc-option,-fno-partial-inlining) 771endif 772 773ifneq ($(CONFIG_FRAME_WARN),0) 774KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 775endif 776 777stackp-flags-y := -fno-stack-protector 778stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 779stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 780 781KBUILD_CFLAGS += $(stackp-flags-y) 782 783ifdef CONFIG_CC_IS_CLANG 784KBUILD_CPPFLAGS += -Qunused-arguments 785KBUILD_CFLAGS += -Wno-format-invalid-specifier 786KBUILD_CFLAGS += -Wno-gnu 787# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 788# source of a reference will be _MergedGlobals and not on of the whitelisted names. 789# See modpost pattern 2 790KBUILD_CFLAGS += -mno-global-merge 791else 792 793# These warnings generated too much noise in a regular build. 794# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 795KBUILD_CFLAGS += -Wno-unused-but-set-variable 796 797# Warn about unmarked fall-throughs in switch statement. 798# Disabled for clang while comment to attribute conversion happens and 799# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 800KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 801endif 802 803KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 804ifdef CONFIG_FRAME_POINTER 805KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 806else 807# Some targets (ARM with Thumb2, for example), can't be built with frame 808# pointers. For those, we don't have FUNCTION_TRACER automatically 809# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 810# incompatible with -fomit-frame-pointer with current GCC, so we don't use 811# -fomit-frame-pointer with FUNCTION_TRACER. 812ifndef CONFIG_FUNCTION_TRACER 813KBUILD_CFLAGS += -fomit-frame-pointer 814endif 815endif 816 817# Initialize all stack variables with a 0xAA pattern. 818ifdef CONFIG_INIT_STACK_ALL_PATTERN 819KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 820endif 821 822# Initialize all stack variables with a zero value. 823ifdef CONFIG_INIT_STACK_ALL_ZERO 824# Future support for zero initialization is still being debated, see 825# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 826# renamed or dropped. 827KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 828KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 829endif 830 831DEBUG_CFLAGS := 832 833# Workaround for GCC versions < 5.0 834# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 835ifdef CONFIG_CC_IS_GCC 836DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 837endif 838 839ifdef CONFIG_DEBUG_INFO 840 841ifdef CONFIG_DEBUG_INFO_SPLIT 842DEBUG_CFLAGS += -gsplit-dwarf 843else 844DEBUG_CFLAGS += -g 845endif 846 847ifneq ($(LLVM_IAS),1) 848KBUILD_AFLAGS += -Wa,-gdwarf-2 849endif 850 851ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 852dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 853dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 854DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 855endif 856 857ifdef CONFIG_DEBUG_INFO_REDUCED 858DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 859 $(call cc-option,-fno-var-tracking) 860endif 861 862ifdef CONFIG_DEBUG_INFO_COMPRESSED 863DEBUG_CFLAGS += -gz=zlib 864KBUILD_AFLAGS += -gz=zlib 865KBUILD_LDFLAGS += --compress-debug-sections=zlib 866endif 867 868endif # CONFIG_DEBUG_INFO 869 870KBUILD_CFLAGS += $(DEBUG_CFLAGS) 871export DEBUG_CFLAGS 872 873ifdef CONFIG_FUNCTION_TRACER 874ifdef CONFIG_FTRACE_MCOUNT_USE_CC 875 CC_FLAGS_FTRACE += -mrecord-mcount 876 ifdef CONFIG_HAVE_NOP_MCOUNT 877 ifeq ($(call cc-option-yn, -mnop-mcount),y) 878 CC_FLAGS_FTRACE += -mnop-mcount 879 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 880 endif 881 endif 882endif 883ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 884 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 885endif 886ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 887 ifdef CONFIG_HAVE_C_RECORDMCOUNT 888 BUILD_C_RECORDMCOUNT := y 889 export BUILD_C_RECORDMCOUNT 890 endif 891endif 892ifdef CONFIG_HAVE_FENTRY 893 ifeq ($(call cc-option-yn, -mfentry),y) 894 CC_FLAGS_FTRACE += -mfentry 895 CC_FLAGS_USING += -DCC_USING_FENTRY 896 endif 897endif 898export CC_FLAGS_FTRACE 899KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 900KBUILD_AFLAGS += $(CC_FLAGS_USING) 901endif 902 903# We trigger additional mismatches with less inlining 904ifdef CONFIG_DEBUG_SECTION_MISMATCH 905KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 906endif 907 908ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 909KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 910LDFLAGS_vmlinux += --gc-sections 911endif 912 913ifdef CONFIG_SHADOW_CALL_STACK 914CC_FLAGS_SCS := -fsanitize=shadow-call-stack 915KBUILD_CFLAGS += $(CC_FLAGS_SCS) 916export CC_FLAGS_SCS 917endif 918 919ifdef CONFIG_LTO_CLANG 920ifdef CONFIG_LTO_CLANG_THIN 921CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 922KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 923else 924CC_FLAGS_LTO := -flto 925endif 926CC_FLAGS_LTO += -fvisibility=hidden 927 928# Limit inlining across translation units to reduce binary size 929KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 930endif 931 932ifdef CONFIG_LTO 933KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 934KBUILD_AFLAGS += -fno-lto 935export CC_FLAGS_LTO 936endif 937 938ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 939KBUILD_CFLAGS += -falign-functions=32 940endif 941 942# arch Makefile may override CC so keep this after arch Makefile is included 943NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 944 945# warn about C99 declaration after statement 946KBUILD_CFLAGS += -Wdeclaration-after-statement 947 948# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 949KBUILD_CFLAGS += -Wvla 950 951# disable pointer signed / unsigned warnings in gcc 4.0 952KBUILD_CFLAGS += -Wno-pointer-sign 953 954# disable stringop warnings in gcc 8+ 955KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 956 957# We'll want to enable this eventually, but it's not going away for 5.7 at least 958KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 959KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 960KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 961 962# Another good warning that we'll want to enable eventually 963KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 964 965# Enabled with W=2, disabled by default as noisy 966KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 967 968# disable invalid "can't wrap" optimizations for signed / pointers 969KBUILD_CFLAGS += -fno-strict-overflow 970 971# Make sure -fstack-check isn't enabled (like gentoo apparently did) 972KBUILD_CFLAGS += -fno-stack-check 973 974# conserve stack if available 975KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 976 977# Prohibit date/time macros, which would make the build non-deterministic 978KBUILD_CFLAGS += -Werror=date-time 979 980# enforce correct pointer usage 981KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 982 983# Require designated initializers for all marked structures 984KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 985 986# change __FILE__ to the relative path from the srctree 987KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 988 989# include additional Makefiles when needed 990include-y := scripts/Makefile.extrawarn 991include-$(CONFIG_KASAN) += scripts/Makefile.kasan 992include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 993include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 994include-$(CONFIG_KCOV) += scripts/Makefile.kcov 995include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 996 997include $(addprefix $(srctree)/, $(include-y)) 998 999# scripts/Makefile.gcc-plugins is intentionally included last. 1000# Do not add $(call cc-option,...) below this line. When you build the kernel 1001# from the clean source tree, the GCC plugins do not exist at this point. 1002 1003# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1004KBUILD_CPPFLAGS += $(KCPPFLAGS) 1005KBUILD_AFLAGS += $(KAFLAGS) 1006KBUILD_CFLAGS += $(KCFLAGS) 1007 1008KBUILD_LDFLAGS_MODULE += --build-id=sha1 1009LDFLAGS_vmlinux += --build-id=sha1 1010 1011ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1012LDFLAGS_vmlinux += $(call ld-option, -X,) 1013endif 1014 1015ifeq ($(CONFIG_RELR),y) 1016LDFLAGS_vmlinux += --pack-dyn-relocs=relr 1017endif 1018 1019# We never want expected sections to be placed heuristically by the 1020# linker. All sections should be explicitly named in the linker script. 1021ifdef CONFIG_LD_ORPHAN_WARN 1022LDFLAGS_vmlinux += --orphan-handling=warn 1023endif 1024 1025# Align the bit size of userspace programs with the kernel 1026KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1027KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1028 1029# make the checker run with the right architecture 1030CHECKFLAGS += --arch=$(ARCH) 1031 1032# insure the checker run with the right endianness 1033CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1034 1035# the checker needs the correct machine size 1036CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1037 1038# Default kernel image to build when no specific target is given. 1039# KBUILD_IMAGE may be overruled on the command line or 1040# set in the environment 1041# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1042# this default value 1043export KBUILD_IMAGE ?= vmlinux 1044 1045# 1046# INSTALL_PATH specifies where to place the updated kernel and system map 1047# images. Default is /boot, but you can set it to other values 1048export INSTALL_PATH ?= /boot 1049 1050# 1051# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1052# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1053# an argument if needed. Otherwise it defaults to the kernel install path 1054# 1055export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1056 1057# 1058# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1059# relocations required by build roots. This is not defined in the 1060# makefile but the argument can be passed to make if needed. 1061# 1062 1063MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1064export MODLIB 1065 1066HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1067 1068has_libelf = $(call try-run,\ 1069 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1070 1071ifdef CONFIG_STACK_VALIDATION 1072 ifeq ($(has_libelf),1) 1073 objtool_target := tools/objtool FORCE 1074 else 1075 SKIP_STACK_VALIDATION := 1 1076 export SKIP_STACK_VALIDATION 1077 endif 1078endif 1079 1080PHONY += resolve_btfids_clean 1081 1082resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1083 1084# tools/bpf/resolve_btfids directory might not exist 1085# in output directory, skip its clean in that case 1086resolve_btfids_clean: 1087ifneq ($(wildcard $(resolve_btfids_O)),) 1088 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1089endif 1090 1091ifdef CONFIG_BPF 1092ifdef CONFIG_DEBUG_INFO_BTF 1093 ifeq ($(has_libelf),1) 1094 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1095 else 1096 ERROR_RESOLVE_BTFIDS := 1 1097 endif 1098endif # CONFIG_DEBUG_INFO_BTF 1099endif # CONFIG_BPF 1100 1101PHONY += prepare0 1102 1103export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1104export MODORDER := $(extmod_prefix)modules.order 1105export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1106 1107ifeq ($(KBUILD_EXTMOD),) 1108core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1109 1110vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1111 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1112 $(libs-y) $(libs-m))) 1113 1114vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1115 $(patsubst %/,%,$(filter %/, $(core-) \ 1116 $(drivers-) $(libs-)))) 1117 1118subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1119 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1120 $(drivers-y) $(drivers-m))) 1121 1122build-dirs := $(vmlinux-dirs) 1123clean-dirs := $(vmlinux-alldirs) 1124 1125# Externally visible symbols (used by link-vmlinux.sh) 1126KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1127KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1128ifdef CONFIG_MODULES 1129KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1130KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1131else 1132KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1133endif 1134KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1135 1136export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1137export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1138# used by scripts/Makefile.package 1139export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1140 1141vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1142 1143# Recurse until adjust_autoksyms.sh is satisfied 1144PHONY += autoksyms_recursive 1145ifdef CONFIG_TRIM_UNUSED_KSYMS 1146# For the kernel to actually contain only the needed exported symbols, 1147# we have to build modules as well to determine what those symbols are. 1148# (this can be evaluated only once include/config/auto.conf has been included) 1149KBUILD_MODULES := 1 1150 1151autoksyms_recursive: descend modules.order 1152 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1153 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1154endif 1155 1156autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1157 1158quiet_cmd_autoksyms_h = GEN $@ 1159 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1160 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1161 1162$(autoksyms_h): 1163 $(call cmd,autoksyms_h) 1164 1165ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1166 1167# Final link of vmlinux with optional arch pass after final link 1168cmd_link-vmlinux = \ 1169 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1170 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1171 1172vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1173 +$(call if_changed_dep,link-vmlinux) 1174 1175targets := vmlinux 1176 1177# The actual objects are generated when descending, 1178# make sure no implicit rule kicks in 1179$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1180 1181filechk_kernel.release = \ 1182 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1183 1184# Store (new) KERNELRELEASE string in include/config/kernel.release 1185include/config/kernel.release: FORCE 1186 $(call filechk,kernel.release) 1187 1188# Additional helpers built in scripts/ 1189# Carefully list dependencies so we do not try to build scripts twice 1190# in parallel 1191PHONY += scripts 1192scripts: scripts_basic scripts_dtc 1193 $(Q)$(MAKE) $(build)=$(@) 1194 1195# Things we need to do before we recursively start building the kernel 1196# or the modules are listed in "prepare". 1197# A multi level approach is used. prepareN is processed before prepareN-1. 1198# archprepare is used in arch Makefiles and when processed asm symlink, 1199# version.h and scripts_basic is processed / created. 1200 1201PHONY += prepare archprepare 1202 1203archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1204 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1205 include/generated/autoconf.h 1206 1207prepare0: archprepare 1208 $(Q)$(MAKE) $(build)=scripts/mod 1209 $(Q)$(MAKE) $(build)=. 1210 1211# All the preparing.. 1212prepare: prepare0 prepare-objtool prepare-resolve_btfids 1213 1214# Support for using generic headers in asm-generic 1215asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1216 1217PHONY += asm-generic uapi-asm-generic 1218asm-generic: uapi-asm-generic 1219 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1220 generic=include/asm-generic 1221uapi-asm-generic: 1222 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1223 generic=include/uapi/asm-generic 1224 1225PHONY += prepare-objtool prepare-resolve_btfids 1226prepare-objtool: $(objtool_target) 1227ifeq ($(SKIP_STACK_VALIDATION),1) 1228ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1229 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1230 @false 1231endif 1232ifdef CONFIG_UNWINDER_ORC 1233 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1234 @false 1235else 1236 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1237endif 1238endif 1239 1240prepare-resolve_btfids: $(resolve_btfids_target) 1241ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1242 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1243 @false 1244endif 1245# Generate some files 1246# --------------------------------------------------------------------------- 1247 1248# KERNELRELEASE can change from a few different places, meaning version.h 1249# needs to be updated, so this check is forced on all builds 1250 1251uts_len := 64 1252define filechk_utsrelease.h 1253 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1254 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1255 exit 1; \ 1256 fi; \ 1257 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1258endef 1259 1260define filechk_version.h 1261 if [ $(SUBLEVEL) -gt 255 ]; then \ 1262 echo \#define LINUX_VERSION_CODE $(shell \ 1263 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1264 else \ 1265 echo \#define LINUX_VERSION_CODE $(shell \ 1266 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1267 fi; \ 1268 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1269 ((c) > 255 ? 255 : (c)))'; \ 1270 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1271 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1272 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1273endef 1274 1275$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1276$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1277$(version_h): FORCE 1278 $(call filechk,version.h) 1279 1280include/generated/utsrelease.h: include/config/kernel.release FORCE 1281 $(call filechk,utsrelease.h) 1282 1283PHONY += headerdep 1284headerdep: 1285 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1286 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1287 1288# --------------------------------------------------------------------------- 1289# Kernel headers 1290 1291#Default location for installed headers 1292export INSTALL_HDR_PATH = $(objtree)/usr 1293 1294quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1295 cmd_headers_install = \ 1296 mkdir -p $(INSTALL_HDR_PATH); \ 1297 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1298 usr/include $(INSTALL_HDR_PATH) 1299 1300PHONY += headers_install 1301headers_install: headers 1302 $(call cmd,headers_install) 1303 1304PHONY += archheaders archscripts 1305 1306hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1307 1308PHONY += headers 1309headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1310 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1311 $(error Headers not exportable for the $(SRCARCH) architecture)) 1312 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1313 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1314 1315# Deprecated. It is no-op now. 1316PHONY += headers_check 1317headers_check: 1318 @echo >&2 "=================== WARNING ===================" 1319 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1320 @echo >&2 "and will be removed after Linux 5.15 release." 1321 @echo >&2 "Please remove headers_check from your scripts." 1322 @echo >&2 "===============================================" 1323 1324ifdef CONFIG_HEADERS_INSTALL 1325prepare: headers 1326endif 1327 1328PHONY += scripts_unifdef 1329scripts_unifdef: scripts_basic 1330 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1331 1332# --------------------------------------------------------------------------- 1333# Kernel selftest 1334 1335PHONY += kselftest 1336kselftest: 1337 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1338 1339kselftest-%: FORCE 1340 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1341 1342PHONY += kselftest-merge 1343kselftest-merge: 1344 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1345 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1346 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1347 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1348 1349# --------------------------------------------------------------------------- 1350# Devicetree files 1351 1352ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1353dtstree := arch/$(SRCARCH)/boot/dts 1354endif 1355 1356ifneq ($(dtstree),) 1357 1358%.dtb: include/config/kernel.release scripts_dtc 1359 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1360 1361%.dtbo: include/config/kernel.release scripts_dtc 1362 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1363 1364PHONY += dtbs dtbs_install dtbs_check 1365dtbs: include/config/kernel.release scripts_dtc 1366 $(Q)$(MAKE) $(build)=$(dtstree) 1367 1368ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1369export CHECK_DTBS=y 1370dtbs: dt_binding_check 1371endif 1372 1373dtbs_check: dtbs 1374 1375dtbs_install: 1376 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1377 1378ifdef CONFIG_OF_EARLY_FLATTREE 1379all: dtbs 1380endif 1381 1382endif 1383 1384PHONY += scripts_dtc 1385scripts_dtc: scripts_basic 1386 $(Q)$(MAKE) $(build)=scripts/dtc 1387 1388ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1389export CHECK_DT_BINDING=y 1390endif 1391 1392PHONY += dt_binding_check 1393dt_binding_check: scripts_dtc 1394 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1395 1396# --------------------------------------------------------------------------- 1397# Modules 1398 1399ifdef CONFIG_MODULES 1400 1401# By default, build modules as well 1402 1403all: modules 1404 1405# When we're building modules with modversions, we need to consider 1406# the built-in objects during the descend as well, in order to 1407# make sure the checksums are up to date before we record them. 1408ifdef CONFIG_MODVERSIONS 1409 KBUILD_BUILTIN := 1 1410endif 1411 1412# Build modules 1413# 1414# A module can be listed more than once in obj-m resulting in 1415# duplicate lines in modules.order files. Those are removed 1416# using awk while concatenating to the final file. 1417 1418PHONY += modules 1419modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1420 1421cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1422 1423modules.order: $(subdir-modorder) FORCE 1424 $(call if_changed,modules_order) 1425 1426targets += modules.order 1427 1428# Target to prepare building external modules 1429PHONY += modules_prepare 1430modules_prepare: prepare 1431 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1432 1433export modules_sign_only := 1434 1435ifeq ($(CONFIG_MODULE_SIG),y) 1436PHONY += modules_sign 1437modules_sign: modules_install 1438 @: 1439 1440# modules_sign is a subset of modules_install. 1441# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1442ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1443modules_sign_only := y 1444endif 1445endif 1446 1447modinst_pre := 1448ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1449modinst_pre := __modinst_pre 1450endif 1451 1452modules_install: $(modinst_pre) 1453PHONY += __modinst_pre 1454__modinst_pre: 1455 @rm -rf $(MODLIB)/kernel 1456 @rm -f $(MODLIB)/source 1457 @mkdir -p $(MODLIB)/kernel 1458 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1459 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1460 rm -f $(MODLIB)/build ; \ 1461 ln -s $(CURDIR) $(MODLIB)/build ; \ 1462 fi 1463 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1464 @cp -f modules.builtin $(MODLIB)/ 1465 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1466 1467endif # CONFIG_MODULES 1468 1469### 1470# Cleaning is done on three levels. 1471# make clean Delete most generated files 1472# Leave enough to build external modules 1473# make mrproper Delete the current configuration, and all generated files 1474# make distclean Remove editor backup files, patch leftover files and the like 1475 1476# Directories & files removed with 'make clean' 1477CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1478 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1479 compile_commands.json .thinlto-cache 1480 1481# Directories & files removed with 'make mrproper' 1482MRPROPER_FILES += include/config include/generated \ 1483 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1484 debian snap tar-install \ 1485 .config .config.old .version \ 1486 Module.symvers \ 1487 signing_key.pem signing_key.priv signing_key.x509 \ 1488 x509.genkey extra_certificates signing_key.x509.keyid \ 1489 signing_key.x509.signer vmlinux-gdb.py \ 1490 *.spec 1491 1492# Directories & files removed with 'make distclean' 1493DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1494 1495# clean - Delete most, but leave enough to build external modules 1496# 1497clean: rm-files := $(CLEAN_FILES) 1498 1499PHONY += archclean vmlinuxclean 1500 1501vmlinuxclean: 1502 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1503 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1504 1505clean: archclean vmlinuxclean resolve_btfids_clean 1506 1507# mrproper - Delete all generated files, including .config 1508# 1509mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1510mrproper-dirs := $(addprefix _mrproper_,scripts) 1511 1512PHONY += $(mrproper-dirs) mrproper 1513$(mrproper-dirs): 1514 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1515 1516mrproper: clean $(mrproper-dirs) 1517 $(call cmd,rmfiles) 1518 1519# distclean 1520# 1521distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1522 1523PHONY += distclean 1524 1525distclean: mrproper 1526 $(call cmd,rmfiles) 1527 @find $(srctree) $(RCS_FIND_IGNORE) \ 1528 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1529 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1530 -o -name 'core' \) \ 1531 -type f -print | xargs rm -f 1532 1533 1534# Packaging of the kernel to various formats 1535# --------------------------------------------------------------------------- 1536 1537%src-pkg: FORCE 1538 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1539%pkg: include/config/kernel.release FORCE 1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1541 1542# Brief documentation of the typical targets used 1543# --------------------------------------------------------------------------- 1544 1545boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1546boards := $(sort $(notdir $(boards))) 1547board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1548board-dirs := $(sort $(notdir $(board-dirs:/=))) 1549 1550PHONY += help 1551help: 1552 @echo 'Cleaning targets:' 1553 @echo ' clean - Remove most generated files but keep the config and' 1554 @echo ' enough build support to build external modules' 1555 @echo ' mrproper - Remove all generated files + config + various backup files' 1556 @echo ' distclean - mrproper + remove editor backup and patch files' 1557 @echo '' 1558 @echo 'Configuration targets:' 1559 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1560 @echo '' 1561 @echo 'Other generic targets:' 1562 @echo ' all - Build all targets marked with [*]' 1563 @echo '* vmlinux - Build the bare kernel' 1564 @echo '* modules - Build all modules' 1565 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1566 @echo ' dir/ - Build all files in dir and below' 1567 @echo ' dir/file.[ois] - Build specified target only' 1568 @echo ' dir/file.ll - Build the LLVM assembly file' 1569 @echo ' (requires compiler support for LLVM assembly generation)' 1570 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1571 @echo ' (requires a recent binutils and recent build (System.map))' 1572 @echo ' dir/file.ko - Build module including final link' 1573 @echo ' modules_prepare - Set up for building external modules' 1574 @echo ' tags/TAGS - Generate tags file for editors' 1575 @echo ' cscope - Generate cscope index' 1576 @echo ' gtags - Generate GNU GLOBAL index' 1577 @echo ' kernelrelease - Output the release version string (use with make -s)' 1578 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1579 @echo ' image_name - Output the image name (use with make -s)' 1580 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1581 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1582 echo '' 1583 @echo 'Static analysers:' 1584 @echo ' checkstack - Generate a list of stack hogs' 1585 @echo ' versioncheck - Sanity check on version.h usage' 1586 @echo ' includecheck - Check for duplicate included header files' 1587 @echo ' export_report - List the usages of all exported symbols' 1588 @echo ' headerdep - Detect inclusion cycles in headers' 1589 @echo ' coccicheck - Check with Coccinelle' 1590 @echo ' clang-analyzer - Check with clang static analyzer' 1591 @echo ' clang-tidy - Check with clang-tidy' 1592 @echo '' 1593 @echo 'Tools:' 1594 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1595 @echo '' 1596 @echo 'Kernel selftest:' 1597 @echo ' kselftest - Build and run kernel selftest' 1598 @echo ' Build, install, and boot kernel before' 1599 @echo ' running kselftest on it' 1600 @echo ' Run as root for full coverage' 1601 @echo ' kselftest-all - Build kernel selftest' 1602 @echo ' kselftest-install - Build and install kernel selftest' 1603 @echo ' kselftest-clean - Remove all generated kselftest files' 1604 @echo ' kselftest-merge - Merge all the config dependencies of' 1605 @echo ' kselftest to existing .config.' 1606 @echo '' 1607 @$(if $(dtstree), \ 1608 echo 'Devicetree:'; \ 1609 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1610 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1611 echo ' dt_binding_check - Validate device tree binding documents'; \ 1612 echo ' dtbs_check - Validate device tree source files';\ 1613 echo '') 1614 1615 @echo 'Userspace tools targets:' 1616 @echo ' use "make tools/help"' 1617 @echo ' or "cd tools; make help"' 1618 @echo '' 1619 @echo 'Kernel packaging:' 1620 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1621 @echo '' 1622 @echo 'Documentation targets:' 1623 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1624 @echo '' 1625 @echo 'Architecture specific targets ($(SRCARCH)):' 1626 @$(if $(archhelp),$(archhelp),\ 1627 echo ' No architecture specific help defined for $(SRCARCH)') 1628 @echo '' 1629 @$(if $(boards), \ 1630 $(foreach b, $(boards), \ 1631 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1632 echo '') 1633 @$(if $(board-dirs), \ 1634 $(foreach b, $(board-dirs), \ 1635 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1636 printf " %-16s - Show all of the above\\n" help-boards; \ 1637 echo '') 1638 1639 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1640 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1641 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1642 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1643 @echo ' (sparse by default)' 1644 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1645 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1646 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1647 @echo ' 1: warnings which may be relevant and do not occur too often' 1648 @echo ' 2: warnings which occur quite often but may still be relevant' 1649 @echo ' 3: more obscure warnings, can most likely be ignored' 1650 @echo ' Multiple levels can be combined with W=12 or W=123' 1651 @echo '' 1652 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1653 @echo 'For further info see the ./README file' 1654 1655 1656help-board-dirs := $(addprefix help-,$(board-dirs)) 1657 1658help-boards: $(help-board-dirs) 1659 1660boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1661 1662$(help-board-dirs): help-%: 1663 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1664 @$(if $(boards-per-dir), \ 1665 $(foreach b, $(boards-per-dir), \ 1666 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1667 echo '') 1668 1669 1670# Documentation targets 1671# --------------------------------------------------------------------------- 1672DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1673 linkcheckdocs dochelp refcheckdocs 1674PHONY += $(DOC_TARGETS) 1675$(DOC_TARGETS): 1676 $(Q)$(MAKE) $(build)=Documentation $@ 1677 1678# Misc 1679# --------------------------------------------------------------------------- 1680 1681PHONY += scripts_gdb 1682scripts_gdb: prepare0 1683 $(Q)$(MAKE) $(build)=scripts/gdb 1684 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1685 1686ifdef CONFIG_GDB_SCRIPTS 1687all: scripts_gdb 1688endif 1689 1690else # KBUILD_EXTMOD 1691 1692### 1693# External module support. 1694# When building external modules the kernel used as basis is considered 1695# read-only, and no consistency checks are made and the make 1696# system is not used on the basis kernel. If updates are required 1697# in the basis kernel ordinary make commands (without M=...) must 1698# be used. 1699# 1700# The following are the only valid targets when building external 1701# modules. 1702# make M=dir clean Delete all automatically generated files 1703# make M=dir modules Make all modules in specified dir 1704# make M=dir Same as 'make M=dir modules' 1705# make M=dir modules_install 1706# Install the modules built in the module directory 1707# Assumes install directory is already created 1708 1709# We are always building only modules. 1710KBUILD_BUILTIN := 1711KBUILD_MODULES := 1 1712 1713build-dirs := $(KBUILD_EXTMOD) 1714$(MODORDER): descend 1715 @: 1716 1717compile_commands.json: $(extmod_prefix)compile_commands.json 1718PHONY += compile_commands.json 1719 1720clean-dirs := $(KBUILD_EXTMOD) 1721clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1722 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1723 1724PHONY += help 1725help: 1726 @echo ' Building external modules.' 1727 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1728 @echo '' 1729 @echo ' modules - default target, build the module(s)' 1730 @echo ' modules_install - install the module' 1731 @echo ' clean - remove generated files in module directory only' 1732 @echo '' 1733 1734# no-op for external module builds 1735PHONY += prepare modules_prepare 1736 1737endif # KBUILD_EXTMOD 1738 1739# --------------------------------------------------------------------------- 1740# Modules 1741 1742PHONY += modules modules_install 1743 1744ifdef CONFIG_MODULES 1745 1746modules: modules_check 1747 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1748 1749PHONY += modules_check 1750modules_check: $(MODORDER) 1751 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1752 1753quiet_cmd_depmod = DEPMOD $(MODLIB) 1754 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1755 $(KERNELRELEASE) 1756 1757modules_install: 1758 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1759 $(call cmd,depmod) 1760 1761else # CONFIG_MODULES 1762 1763# Modules not configured 1764# --------------------------------------------------------------------------- 1765 1766modules modules_install: 1767 @echo >&2 '***' 1768 @echo >&2 '*** The present kernel configuration has modules disabled.' 1769 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1770 @echo >&2 '*** to enable CONFIG_MODULES.' 1771 @echo >&2 '***' 1772 @exit 1 1773 1774endif # CONFIG_MODULES 1775 1776# Single targets 1777# --------------------------------------------------------------------------- 1778# To build individual files in subdirectories, you can do like this: 1779# 1780# make foo/bar/baz.s 1781# 1782# The supported suffixes for single-target are listed in 'single-targets' 1783# 1784# To build only under specific subdirectories, you can do like this: 1785# 1786# make foo/bar/baz/ 1787 1788ifdef single-build 1789 1790# .ko is special because modpost is needed 1791single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1792single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1793 1794$(single-ko): single_modpost 1795 @: 1796$(single-no-ko): descend 1797 @: 1798 1799ifeq ($(KBUILD_EXTMOD),) 1800# For the single build of in-tree modules, use a temporary file to avoid 1801# the situation of modules_install installing an invalid modules.order. 1802MODORDER := .modules.tmp 1803endif 1804 1805PHONY += single_modpost 1806single_modpost: $(single-no-ko) modules_prepare 1807 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1808 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1809 1810KBUILD_MODULES := 1 1811 1812export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1813 1814# trim unrelated directories 1815build-dirs := $(foreach d, $(build-dirs), \ 1816 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1817 1818endif 1819 1820ifndef CONFIG_MODULES 1821KBUILD_MODULES := 1822endif 1823 1824# Handle descending into subdirectories listed in $(build-dirs) 1825# Preset locale variables to speed up the build process. Limit locale 1826# tweaks to this spot to avoid wrong language settings when running 1827# make menuconfig etc. 1828# Error messages still appears in the original language 1829PHONY += descend $(build-dirs) 1830descend: $(build-dirs) 1831$(build-dirs): prepare 1832 $(Q)$(MAKE) $(build)=$@ \ 1833 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1834 need-builtin=1 need-modorder=1 1835 1836clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1837PHONY += $(clean-dirs) clean 1838$(clean-dirs): 1839 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1840 1841clean: $(clean-dirs) 1842 $(call cmd,rmfiles) 1843 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1844 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1845 -o -name '*.ko.*' \ 1846 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1847 -o -name '*.dwo' -o -name '*.lst' \ 1848 -o -name '*.su' -o -name '*.mod' \ 1849 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1850 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1851 -o -name '*.asn1.[ch]' \ 1852 -o -name '*.symtypes' -o -name 'modules.order' \ 1853 -o -name '.tmp_*.o.*' \ 1854 -o -name '*.c.[012]*.*' \ 1855 -o -name '*.ll' \ 1856 -o -name '*.gcno' \ 1857 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1858 1859# Generate tags for editors 1860# --------------------------------------------------------------------------- 1861quiet_cmd_tags = GEN $@ 1862 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1863 1864tags TAGS cscope gtags: FORCE 1865 $(call cmd,tags) 1866 1867# Script to generate missing namespace dependencies 1868# --------------------------------------------------------------------------- 1869 1870PHONY += nsdeps 1871nsdeps: export KBUILD_NSDEPS=1 1872nsdeps: modules 1873 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1874 1875# Clang Tooling 1876# --------------------------------------------------------------------------- 1877 1878quiet_cmd_gen_compile_commands = GEN $@ 1879 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1880 1881$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1882 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1883 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1884 $(call if_changed,gen_compile_commands) 1885 1886targets += $(extmod_prefix)compile_commands.json 1887 1888PHONY += clang-tidy clang-analyzer 1889 1890ifdef CONFIG_CC_IS_CLANG 1891quiet_cmd_clang_tools = CHECK $< 1892 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1893 1894clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1895 $(call cmd,clang_tools) 1896else 1897clang-tidy clang-analyzer: 1898 @echo "$@ requires CC=clang" >&2 1899 @false 1900endif 1901 1902# Scripts to check various things for consistency 1903# --------------------------------------------------------------------------- 1904 1905PHONY += includecheck versioncheck coccicheck export_report 1906 1907includecheck: 1908 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1909 -name '*.[hcS]' -type f -print | sort \ 1910 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1911 1912versioncheck: 1913 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1914 -name '*.[hcS]' -type f -print | sort \ 1915 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1916 1917coccicheck: 1918 $(Q)$(BASH) $(srctree)/scripts/$@ 1919 1920export_report: 1921 $(PERL) $(srctree)/scripts/export_report.pl 1922 1923PHONY += checkstack kernelrelease kernelversion image_name 1924 1925# UML needs a little special treatment here. It wants to use the host 1926# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1927# else wants $(ARCH), including people doing cross-builds, which means 1928# that $(SUBARCH) doesn't work here. 1929ifeq ($(ARCH), um) 1930CHECKSTACK_ARCH := $(SUBARCH) 1931else 1932CHECKSTACK_ARCH := $(ARCH) 1933endif 1934checkstack: 1935 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1936 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1937 1938kernelrelease: 1939 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1940 1941kernelversion: 1942 @echo $(KERNELVERSION) 1943 1944image_name: 1945 @echo $(KBUILD_IMAGE) 1946 1947# Clear a bunch of variables before executing the submake 1948 1949ifeq ($(quiet),silent_) 1950tools_silent=s 1951endif 1952 1953tools/: FORCE 1954 $(Q)mkdir -p $(objtree)/tools 1955 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1956 1957tools/%: FORCE 1958 $(Q)mkdir -p $(objtree)/tools 1959 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1960 1961quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1962 cmd_rmfiles = rm -rf $(rm-files) 1963 1964# read saved command lines for existing targets 1965existing-targets := $(wildcard $(sort $(targets))) 1966 1967-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1968 1969endif # config-build 1970endif # mixed-build 1971endif # need-sub-make 1972 1973PHONY += FORCE 1974FORCE: 1975 1976# Declare the contents of the PHONY variable as phony. We keep that 1977# information in a variable so we can use it in if_changed and friends. 1978.PHONY: $(PHONY) 1979