1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 13 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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 ($(ARCH),sparc64) 399 SRCARCH := sparc 400endif 401 402export cross_compiling := 403ifneq ($(SRCARCH),$(SUBARCH)) 404cross_compiling := 1 405endif 406 407KCONFIG_CONFIG ?= .config 408export KCONFIG_CONFIG 409 410# SHELL used by kbuild 411CONFIG_SHELL := sh 412 413HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 414HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 415HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 416 417ifneq ($(LLVM),) 418HOSTCC = clang 419HOSTCXX = clang++ 420else 421HOSTCC = gcc 422HOSTCXX = g++ 423endif 424 425export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 426 -O2 -fomit-frame-pointer -std=gnu89 427export KBUILD_USERLDFLAGS := 428 429KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 430KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 431KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 432KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 433 434# Make variables (CC, etc...) 435CPP = $(CC) -E 436ifneq ($(LLVM),) 437CC = clang 438LD = ld.lld 439AR = llvm-ar 440NM = llvm-nm 441OBJCOPY = llvm-objcopy 442OBJDUMP = llvm-objdump 443READELF = llvm-readelf 444STRIP = llvm-strip 445else 446CC = $(CROSS_COMPILE)gcc 447LD = $(CROSS_COMPILE)ld 448AR = $(CROSS_COMPILE)ar 449NM = $(CROSS_COMPILE)nm 450OBJCOPY = $(CROSS_COMPILE)objcopy 451OBJDUMP = $(CROSS_COMPILE)objdump 452READELF = $(CROSS_COMPILE)readelf 453STRIP = $(CROSS_COMPILE)strip 454endif 455PAHOLE = pahole 456RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 457LEX = flex 458YACC = bison 459AWK = awk 460INSTALLKERNEL := installkernel 461DEPMOD = depmod 462PERL = perl 463PYTHON3 = python3 464CHECK = sparse 465BASH = bash 466KGZIP = gzip 467KBZIP2 = bzip2 468KLZOP = lzop 469LZMA = lzma 470LZ4 = lz4c 471XZ = xz 472ZSTD = zstd 473 474CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 475 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 476NOSTDINC_FLAGS := 477CFLAGS_MODULE = 478AFLAGS_MODULE = 479LDFLAGS_MODULE = 480CFLAGS_KERNEL = 481AFLAGS_KERNEL = 482LDFLAGS_vmlinux = 483 484# Use USERINCLUDE when you must reference the UAPI directories only. 485USERINCLUDE := \ 486 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 487 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 488 -I$(srctree)/include/uapi \ 489 -I$(objtree)/include/generated/uapi \ 490 -include $(srctree)/include/linux/compiler-version.h \ 491 -include $(srctree)/include/linux/kconfig.h 492 493# Use LINUXINCLUDE when you must reference the include/ directory. 494# Needed to be compatible with the O= option 495LINUXINCLUDE := \ 496 -I$(srctree)/arch/$(SRCARCH)/include \ 497 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 498 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 499 -I$(objtree)/include \ 500 $(USERINCLUDE) 501 502KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 503KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 504 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 505 -Werror=implicit-function-declaration -Werror=implicit-int \ 506 -Werror=return-type -Wno-format-security \ 507 -std=gnu89 508KBUILD_CPPFLAGS := -D__KERNEL__ 509KBUILD_AFLAGS_KERNEL := 510KBUILD_CFLAGS_KERNEL := 511KBUILD_AFLAGS_MODULE := -DMODULE 512KBUILD_CFLAGS_MODULE := -DMODULE 513KBUILD_LDFLAGS_MODULE := 514KBUILD_LDFLAGS := 515CLANG_FLAGS := 516 517export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 518export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 519export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 520export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 521export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 522 523export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 524export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 525export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 526export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 527export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 528 529# Files to ignore in find ... statements 530 531export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 532 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 533 -prune -o 534export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 535 --exclude CVS --exclude .pc --exclude .hg --exclude .git 536 537# =========================================================================== 538# Rules shared between *config targets and build targets 539 540# Basic helpers built in scripts/basic/ 541PHONY += scripts_basic 542scripts_basic: 543 $(Q)$(MAKE) $(build)=scripts/basic 544 $(Q)rm -f .tmp_quiet_recordmcount 545 546PHONY += outputmakefile 547# Before starting out-of-tree build, make sure the source tree is clean. 548# outputmakefile generates a Makefile in the output directory, if using a 549# separate output directory. This allows convenient use of make in the 550# output directory. 551# At the same time when output Makefile generated, generate .gitignore to 552# ignore whole output directory 553outputmakefile: 554ifdef building_out_of_srctree 555 $(Q)if [ -f $(srctree)/.config -o \ 556 -d $(srctree)/include/config -o \ 557 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 558 echo >&2 "***"; \ 559 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 560 echo >&2 "*** in $(abs_srctree)";\ 561 echo >&2 "***"; \ 562 false; \ 563 fi 564 $(Q)ln -fsn $(srctree) source 565 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 566 $(Q)test -e .gitignore || \ 567 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 568endif 569 570# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 571# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 572# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 573# and from include/config/auto.conf.cmd to detect the compiler upgrade. 574CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 575 576ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 577ifneq ($(CROSS_COMPILE),) 578CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 579endif 580ifeq ($(LLVM_IAS),1) 581CLANG_FLAGS += -integrated-as 582else 583CLANG_FLAGS += -no-integrated-as 584GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 585CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 586endif 587CLANG_FLAGS += -Werror=unknown-warning-option 588KBUILD_CFLAGS += $(CLANG_FLAGS) 589KBUILD_AFLAGS += $(CLANG_FLAGS) 590export CLANG_FLAGS 591endif 592 593# Include this also for config targets because some architectures need 594# cc-cross-prefix to determine CROSS_COMPILE. 595ifdef need-compiler 596include $(srctree)/scripts/Makefile.compiler 597endif 598 599ifdef config-build 600# =========================================================================== 601# *config targets only - make sure prerequisites are updated, and descend 602# in scripts/kconfig to make the *config target 603 604# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 605# KBUILD_DEFCONFIG may point out an alternative default configuration 606# used for 'make defconfig' 607include $(srctree)/arch/$(SRCARCH)/Makefile 608export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 609 610config: outputmakefile scripts_basic FORCE 611 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 612 613%config: outputmakefile scripts_basic FORCE 614 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 615 616else #!config-build 617# =========================================================================== 618# Build targets only - this includes vmlinux, arch specific targets, clean 619# targets and others. In general all targets except *config targets. 620 621# If building an external module we do not care about the all: rule 622# but instead __all depend on modules 623PHONY += all 624ifeq ($(KBUILD_EXTMOD),) 625__all: all 626else 627__all: modules 628endif 629 630# Decide whether to build built-in, modular, or both. 631# Normally, just do built-in. 632 633KBUILD_MODULES := 634KBUILD_BUILTIN := 1 635 636# If we have only "make modules", don't compile built-in objects. 637ifeq ($(MAKECMDGOALS),modules) 638 KBUILD_BUILTIN := 639endif 640 641# If we have "make <whatever> modules", compile modules 642# in addition to whatever we do anyway. 643# Just "make" or "make all" shall build modules as well 644 645ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 646 KBUILD_MODULES := 1 647endif 648 649ifeq ($(MAKECMDGOALS),) 650 KBUILD_MODULES := 1 651endif 652 653export KBUILD_MODULES KBUILD_BUILTIN 654 655ifdef need-config 656include include/config/auto.conf 657endif 658 659ifeq ($(KBUILD_EXTMOD),) 660# Objects we will link into vmlinux / subdirs we need to visit 661core-y := init/ usr/ 662drivers-y := drivers/ sound/ 663drivers-$(CONFIG_SAMPLES) += samples/ 664drivers-$(CONFIG_NET) += net/ 665drivers-y += virt/ 666libs-y := lib/ 667endif # KBUILD_EXTMOD 668 669# The all: target is the default when no target is given on the 670# command line. 671# This allow a user to issue only 'make' to build a kernel including modules 672# Defaults to vmlinux, but the arch makefile usually adds further targets 673all: vmlinux 674 675CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 676 $(call cc-option,-fno-tree-loop-im) \ 677 $(call cc-disable-warning,maybe-uninitialized,) 678export CFLAGS_GCOV 679 680# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 681ifdef CONFIG_FUNCTION_TRACER 682 CC_FLAGS_FTRACE := -pg 683endif 684 685RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 686RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 687RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 688RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 689RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 690RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 691export RETPOLINE_CFLAGS 692export RETPOLINE_VDSO_CFLAGS 693 694include $(srctree)/arch/$(SRCARCH)/Makefile 695 696ifdef need-config 697ifdef may-sync-config 698# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 699# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 700# because some architectures define CROSS_COMPILE there. 701include include/config/auto.conf.cmd 702 703$(KCONFIG_CONFIG): 704 @echo >&2 '***' 705 @echo >&2 '*** Configuration file "$@" not found!' 706 @echo >&2 '***' 707 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 708 @echo >&2 '*** "make menuconfig" or "make xconfig").' 709 @echo >&2 '***' 710 @/bin/false 711 712# The actual configuration files used during the build are stored in 713# include/generated/ and include/config/. Update them if .config is newer than 714# include/config/auto.conf (which mirrors .config). 715# 716# This exploits the 'multi-target pattern rule' trick. 717# The syncconfig should be executed only once to make all the targets. 718# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 719quiet_cmd_syncconfig = SYNC $@ 720 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 721 722%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 723 +$(call cmd,syncconfig) 724else # !may-sync-config 725# External modules and some install targets need include/generated/autoconf.h 726# and include/config/auto.conf but do not care if they are up-to-date. 727# Use auto.conf to trigger the test 728PHONY += include/config/auto.conf 729 730include/config/auto.conf: 731 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 732 echo >&2; \ 733 echo >&2 " ERROR: Kernel configuration is invalid."; \ 734 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 735 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 736 echo >&2 ; \ 737 /bin/false) 738 739endif # may-sync-config 740endif # need-config 741 742KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 743KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 744KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 745KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 746KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 747 748ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 749KBUILD_CFLAGS += -O2 750else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 751KBUILD_CFLAGS += -O3 752else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 753KBUILD_CFLAGS += -Os 754endif 755 756# Tell gcc to never replace conditional load with a non-conditional one 757KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 758KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 759 760ifdef CONFIG_READABLE_ASM 761# Disable optimizations that make assembler listings hard to read. 762# reorder blocks reorders the control in the function 763# ipa clone creates specialized cloned functions 764# partial inlining inlines only parts of functions 765KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 766 $(call cc-option,-fno-ipa-cp-clone,) \ 767 $(call cc-option,-fno-partial-inlining) 768endif 769 770ifneq ($(CONFIG_FRAME_WARN),0) 771KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 772endif 773 774stackp-flags-y := -fno-stack-protector 775stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 776stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 777 778KBUILD_CFLAGS += $(stackp-flags-y) 779 780ifdef CONFIG_CC_IS_CLANG 781KBUILD_CPPFLAGS += -Qunused-arguments 782KBUILD_CFLAGS += -Wno-format-invalid-specifier 783KBUILD_CFLAGS += -Wno-gnu 784# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 785# source of a reference will be _MergedGlobals and not on of the whitelisted names. 786# See modpost pattern 2 787KBUILD_CFLAGS += -mno-global-merge 788else 789 790# Warn about unmarked fall-throughs in switch statement. 791# Disabled for clang while comment to attribute conversion happens and 792# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 793KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 794endif 795 796# These warnings generated too much noise in a regular build. 797# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 798KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 799 800KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 801ifdef CONFIG_FRAME_POINTER 802KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 803else 804# Some targets (ARM with Thumb2, for example), can't be built with frame 805# pointers. For those, we don't have FUNCTION_TRACER automatically 806# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 807# incompatible with -fomit-frame-pointer with current GCC, so we don't use 808# -fomit-frame-pointer with FUNCTION_TRACER. 809ifndef CONFIG_FUNCTION_TRACER 810KBUILD_CFLAGS += -fomit-frame-pointer 811endif 812endif 813 814# Initialize all stack variables with a 0xAA pattern. 815ifdef CONFIG_INIT_STACK_ALL_PATTERN 816KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 817endif 818 819# Initialize all stack variables with a zero value. 820ifdef CONFIG_INIT_STACK_ALL_ZERO 821# Future support for zero initialization is still being debated, see 822# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 823# renamed or dropped. 824KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 825KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 826endif 827 828# While VLAs have been removed, GCC produces unreachable stack probes 829# for the randomize_kstack_offset feature. Disable it for all compilers. 830KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 831 832DEBUG_CFLAGS := 833 834# Workaround for GCC versions < 5.0 835# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 836ifdef CONFIG_CC_IS_GCC 837DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 838endif 839 840ifdef CONFIG_DEBUG_INFO 841 842ifdef CONFIG_DEBUG_INFO_SPLIT 843DEBUG_CFLAGS += -gsplit-dwarf 844else 845DEBUG_CFLAGS += -g 846endif 847 848ifneq ($(LLVM_IAS),1) 849KBUILD_AFLAGS += -Wa,-gdwarf-2 850endif 851 852ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 853dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 854dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 855DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 856endif 857 858ifdef CONFIG_DEBUG_INFO_REDUCED 859DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 860 $(call cc-option,-fno-var-tracking) 861endif 862 863ifdef CONFIG_DEBUG_INFO_COMPRESSED 864DEBUG_CFLAGS += -gz=zlib 865KBUILD_AFLAGS += -gz=zlib 866KBUILD_LDFLAGS += --compress-debug-sections=zlib 867endif 868 869endif # CONFIG_DEBUG_INFO 870 871KBUILD_CFLAGS += $(DEBUG_CFLAGS) 872export DEBUG_CFLAGS 873 874ifdef CONFIG_FUNCTION_TRACER 875ifdef CONFIG_FTRACE_MCOUNT_USE_CC 876 CC_FLAGS_FTRACE += -mrecord-mcount 877 ifdef CONFIG_HAVE_NOP_MCOUNT 878 ifeq ($(call cc-option-yn, -mnop-mcount),y) 879 CC_FLAGS_FTRACE += -mnop-mcount 880 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 881 endif 882 endif 883endif 884ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 885 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 886endif 887ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 888 ifdef CONFIG_HAVE_C_RECORDMCOUNT 889 BUILD_C_RECORDMCOUNT := y 890 export BUILD_C_RECORDMCOUNT 891 endif 892endif 893ifdef CONFIG_HAVE_FENTRY 894 ifeq ($(call cc-option-yn, -mfentry),y) 895 CC_FLAGS_FTRACE += -mfentry 896 CC_FLAGS_USING += -DCC_USING_FENTRY 897 endif 898endif 899export CC_FLAGS_FTRACE 900KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 901KBUILD_AFLAGS += $(CC_FLAGS_USING) 902endif 903 904# We trigger additional mismatches with less inlining 905ifdef CONFIG_DEBUG_SECTION_MISMATCH 906KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 907endif 908 909ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 910KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 911LDFLAGS_vmlinux += --gc-sections 912endif 913 914ifdef CONFIG_SHADOW_CALL_STACK 915CC_FLAGS_SCS := -fsanitize=shadow-call-stack 916KBUILD_CFLAGS += $(CC_FLAGS_SCS) 917export CC_FLAGS_SCS 918endif 919 920ifdef CONFIG_LTO_CLANG 921ifdef CONFIG_LTO_CLANG_THIN 922CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 923KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 924else 925CC_FLAGS_LTO := -flto 926endif 927CC_FLAGS_LTO += -fvisibility=hidden 928 929# Limit inlining across translation units to reduce binary size 930KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 931 932# Check for frame size exceeding threshold during prolog/epilog insertion. 933ifneq ($(CONFIG_FRAME_WARN),0) 934KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 935endif 936endif 937 938ifdef CONFIG_LTO 939KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 940KBUILD_AFLAGS += -fno-lto 941export CC_FLAGS_LTO 942endif 943 944ifdef CONFIG_CFI_CLANG 945CC_FLAGS_CFI := -fsanitize=cfi \ 946 -fsanitize-cfi-cross-dso \ 947 -fno-sanitize-cfi-canonical-jump-tables \ 948 -fno-sanitize-trap=cfi \ 949 -fno-sanitize-blacklist 950 951ifdef CONFIG_CFI_PERMISSIVE 952CC_FLAGS_CFI += -fsanitize-recover=cfi 953endif 954 955# If LTO flags are filtered out, we must also filter out CFI. 956CC_FLAGS_LTO += $(CC_FLAGS_CFI) 957KBUILD_CFLAGS += $(CC_FLAGS_CFI) 958export CC_FLAGS_CFI 959endif 960 961ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 962KBUILD_CFLAGS += -falign-functions=32 963endif 964 965# arch Makefile may override CC so keep this after arch Makefile is included 966NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 967 968# warn about C99 declaration after statement 969KBUILD_CFLAGS += -Wdeclaration-after-statement 970 971# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 972KBUILD_CFLAGS += -Wvla 973 974# disable pointer signed / unsigned warnings in gcc 4.0 975KBUILD_CFLAGS += -Wno-pointer-sign 976 977# disable stringop warnings in gcc 8+ 978KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 979 980# We'll want to enable this eventually, but it's not going away for 5.7 at least 981KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 982KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 983KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 984 985# Another good warning that we'll want to enable eventually 986KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 987 988# Enabled with W=2, disabled by default as noisy 989KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 990 991# disable invalid "can't wrap" optimizations for signed / pointers 992KBUILD_CFLAGS += -fno-strict-overflow 993 994# Make sure -fstack-check isn't enabled (like gentoo apparently did) 995KBUILD_CFLAGS += -fno-stack-check 996 997# conserve stack if available 998KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 999 1000# Prohibit date/time macros, which would make the build non-deterministic 1001KBUILD_CFLAGS += -Werror=date-time 1002 1003# enforce correct pointer usage 1004KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1005 1006# Require designated initializers for all marked structures 1007KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1008 1009# change __FILE__ to the relative path from the srctree 1010KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1011 1012# include additional Makefiles when needed 1013include-y := scripts/Makefile.extrawarn 1014include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1015include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1016include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1017include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1018include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1019 1020include $(addprefix $(srctree)/, $(include-y)) 1021 1022# scripts/Makefile.gcc-plugins is intentionally included last. 1023# Do not add $(call cc-option,...) below this line. When you build the kernel 1024# from the clean source tree, the GCC plugins do not exist at this point. 1025 1026# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1027KBUILD_CPPFLAGS += $(KCPPFLAGS) 1028KBUILD_AFLAGS += $(KAFLAGS) 1029KBUILD_CFLAGS += $(KCFLAGS) 1030 1031KBUILD_LDFLAGS_MODULE += --build-id=sha1 1032LDFLAGS_vmlinux += --build-id=sha1 1033 1034ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1035LDFLAGS_vmlinux += $(call ld-option, -X,) 1036endif 1037 1038ifeq ($(CONFIG_RELR),y) 1039LDFLAGS_vmlinux += --pack-dyn-relocs=relr 1040endif 1041 1042# We never want expected sections to be placed heuristically by the 1043# linker. All sections should be explicitly named in the linker script. 1044ifdef CONFIG_LD_ORPHAN_WARN 1045LDFLAGS_vmlinux += --orphan-handling=warn 1046endif 1047 1048# Align the bit size of userspace programs with the kernel 1049KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1050KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1051 1052# make the checker run with the right architecture 1053CHECKFLAGS += --arch=$(ARCH) 1054 1055# insure the checker run with the right endianness 1056CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1057 1058# the checker needs the correct machine size 1059CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1060 1061# Default kernel image to build when no specific target is given. 1062# KBUILD_IMAGE may be overruled on the command line or 1063# set in the environment 1064# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1065# this default value 1066export KBUILD_IMAGE ?= vmlinux 1067 1068# 1069# INSTALL_PATH specifies where to place the updated kernel and system map 1070# images. Default is /boot, but you can set it to other values 1071export INSTALL_PATH ?= /boot 1072 1073# 1074# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1075# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1076# an argument if needed. Otherwise it defaults to the kernel install path 1077# 1078export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1079 1080# 1081# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1082# relocations required by build roots. This is not defined in the 1083# makefile but the argument can be passed to make if needed. 1084# 1085 1086MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1087export MODLIB 1088 1089HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1090 1091has_libelf = $(call try-run,\ 1092 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1093 1094ifdef CONFIG_STACK_VALIDATION 1095 ifeq ($(has_libelf),1) 1096 objtool_target := tools/objtool FORCE 1097 else 1098 SKIP_STACK_VALIDATION := 1 1099 export SKIP_STACK_VALIDATION 1100 endif 1101endif 1102 1103PHONY += resolve_btfids_clean 1104 1105resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1106 1107# tools/bpf/resolve_btfids directory might not exist 1108# in output directory, skip its clean in that case 1109resolve_btfids_clean: 1110ifneq ($(wildcard $(resolve_btfids_O)),) 1111 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1112endif 1113 1114ifdef CONFIG_BPF 1115ifdef CONFIG_DEBUG_INFO_BTF 1116 ifeq ($(has_libelf),1) 1117 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1118 else 1119 ERROR_RESOLVE_BTFIDS := 1 1120 endif 1121endif # CONFIG_DEBUG_INFO_BTF 1122endif # CONFIG_BPF 1123 1124PHONY += prepare0 1125 1126export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1127export MODORDER := $(extmod_prefix)modules.order 1128export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1129 1130ifeq ($(KBUILD_EXTMOD),) 1131core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1132 1133vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1134 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1135 $(libs-y) $(libs-m))) 1136 1137vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1138 $(patsubst %/,%,$(filter %/, $(core-) \ 1139 $(drivers-) $(libs-)))) 1140 1141subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1142 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1143 $(drivers-y) $(drivers-m))) 1144 1145build-dirs := $(vmlinux-dirs) 1146clean-dirs := $(vmlinux-alldirs) 1147 1148# Externally visible symbols (used by link-vmlinux.sh) 1149KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1150KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1151ifdef CONFIG_MODULES 1152KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1153KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1154else 1155KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1156endif 1157KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1158 1159export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1160export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1161# used by scripts/Makefile.package 1162export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1163 1164vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1165 1166# Recurse until adjust_autoksyms.sh is satisfied 1167PHONY += autoksyms_recursive 1168ifdef CONFIG_TRIM_UNUSED_KSYMS 1169# For the kernel to actually contain only the needed exported symbols, 1170# we have to build modules as well to determine what those symbols are. 1171# (this can be evaluated only once include/config/auto.conf has been included) 1172KBUILD_MODULES := 1 1173 1174autoksyms_recursive: descend modules.order 1175 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1176 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1177endif 1178 1179autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1180 1181quiet_cmd_autoksyms_h = GEN $@ 1182 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1183 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1184 1185$(autoksyms_h): 1186 $(call cmd,autoksyms_h) 1187 1188ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1189 1190# Final link of vmlinux with optional arch pass after final link 1191cmd_link-vmlinux = \ 1192 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1193 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1194 1195vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1196 +$(call if_changed_dep,link-vmlinux) 1197 1198targets := vmlinux 1199 1200# The actual objects are generated when descending, 1201# make sure no implicit rule kicks in 1202$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1203 1204filechk_kernel.release = \ 1205 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1206 1207# Store (new) KERNELRELEASE string in include/config/kernel.release 1208include/config/kernel.release: FORCE 1209 $(call filechk,kernel.release) 1210 1211# Additional helpers built in scripts/ 1212# Carefully list dependencies so we do not try to build scripts twice 1213# in parallel 1214PHONY += scripts 1215scripts: scripts_basic scripts_dtc 1216 $(Q)$(MAKE) $(build)=$(@) 1217 1218# Things we need to do before we recursively start building the kernel 1219# or the modules are listed in "prepare". 1220# A multi level approach is used. prepareN is processed before prepareN-1. 1221# archprepare is used in arch Makefiles and when processed asm symlink, 1222# version.h and scripts_basic is processed / created. 1223 1224PHONY += prepare archprepare 1225 1226archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1227 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1228 include/generated/autoconf.h remove-stale-files 1229 1230prepare0: archprepare 1231 $(Q)$(MAKE) $(build)=scripts/mod 1232 $(Q)$(MAKE) $(build)=. 1233 1234# All the preparing.. 1235prepare: prepare0 prepare-objtool prepare-resolve_btfids 1236 1237PHONY += remove-stale-files 1238remove-stale-files: 1239 $(Q)$(srctree)/scripts/remove-stale-files 1240 1241# Support for using generic headers in asm-generic 1242asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1243 1244PHONY += asm-generic uapi-asm-generic 1245asm-generic: uapi-asm-generic 1246 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1247 generic=include/asm-generic 1248uapi-asm-generic: 1249 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1250 generic=include/uapi/asm-generic 1251 1252PHONY += prepare-objtool prepare-resolve_btfids 1253prepare-objtool: $(objtool_target) 1254ifeq ($(SKIP_STACK_VALIDATION),1) 1255ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1256 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1257 @false 1258endif 1259ifdef CONFIG_UNWINDER_ORC 1260 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1261 @false 1262else 1263 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1264endif 1265endif 1266 1267prepare-resolve_btfids: $(resolve_btfids_target) 1268ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1269 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1270 @false 1271endif 1272# Generate some files 1273# --------------------------------------------------------------------------- 1274 1275# KERNELRELEASE can change from a few different places, meaning version.h 1276# needs to be updated, so this check is forced on all builds 1277 1278uts_len := 64 1279define filechk_utsrelease.h 1280 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1281 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1282 exit 1; \ 1283 fi; \ 1284 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1285endef 1286 1287define filechk_version.h 1288 if [ $(SUBLEVEL) -gt 255 ]; then \ 1289 echo \#define LINUX_VERSION_CODE $(shell \ 1290 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1291 else \ 1292 echo \#define LINUX_VERSION_CODE $(shell \ 1293 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1294 fi; \ 1295 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1296 ((c) > 255 ? 255 : (c)))'; \ 1297 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1298 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1299 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1300endef 1301 1302$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1303$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1304$(version_h): FORCE 1305 $(call filechk,version.h) 1306 1307include/generated/utsrelease.h: include/config/kernel.release FORCE 1308 $(call filechk,utsrelease.h) 1309 1310PHONY += headerdep 1311headerdep: 1312 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1313 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1314 1315# --------------------------------------------------------------------------- 1316# Kernel headers 1317 1318#Default location for installed headers 1319export INSTALL_HDR_PATH = $(objtree)/usr 1320 1321quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1322 cmd_headers_install = \ 1323 mkdir -p $(INSTALL_HDR_PATH); \ 1324 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1325 usr/include $(INSTALL_HDR_PATH) 1326 1327PHONY += headers_install 1328headers_install: headers 1329 $(call cmd,headers_install) 1330 1331PHONY += archheaders archscripts 1332 1333hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1334 1335PHONY += headers 1336headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1337 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1338 $(error Headers not exportable for the $(SRCARCH) architecture)) 1339 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1340 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1341 1342# Deprecated. It is no-op now. 1343PHONY += headers_check 1344headers_check: 1345 @echo >&2 "=================== WARNING ===================" 1346 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1347 @echo >&2 "and will be removed after Linux 5.15 release." 1348 @echo >&2 "Please remove headers_check from your scripts." 1349 @echo >&2 "===============================================" 1350 1351ifdef CONFIG_HEADERS_INSTALL 1352prepare: headers 1353endif 1354 1355PHONY += scripts_unifdef 1356scripts_unifdef: scripts_basic 1357 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1358 1359# --------------------------------------------------------------------------- 1360# Kernel selftest 1361 1362PHONY += kselftest 1363kselftest: 1364 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1365 1366kselftest-%: FORCE 1367 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1368 1369PHONY += kselftest-merge 1370kselftest-merge: 1371 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1372 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1373 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1374 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1375 1376# --------------------------------------------------------------------------- 1377# Devicetree files 1378 1379ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1380dtstree := arch/$(SRCARCH)/boot/dts 1381endif 1382 1383ifneq ($(dtstree),) 1384 1385%.dtb: include/config/kernel.release scripts_dtc 1386 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1387 1388%.dtbo: include/config/kernel.release scripts_dtc 1389 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1390 1391PHONY += dtbs dtbs_install dtbs_check 1392dtbs: include/config/kernel.release scripts_dtc 1393 $(Q)$(MAKE) $(build)=$(dtstree) 1394 1395ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1396export CHECK_DTBS=y 1397dtbs: dt_binding_check 1398endif 1399 1400dtbs_check: dtbs 1401 1402dtbs_install: 1403 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1404 1405ifdef CONFIG_OF_EARLY_FLATTREE 1406all: dtbs 1407endif 1408 1409endif 1410 1411PHONY += scripts_dtc 1412scripts_dtc: scripts_basic 1413 $(Q)$(MAKE) $(build)=scripts/dtc 1414 1415ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1416export CHECK_DT_BINDING=y 1417endif 1418 1419PHONY += dt_binding_check 1420dt_binding_check: scripts_dtc 1421 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1422 1423# --------------------------------------------------------------------------- 1424# Modules 1425 1426ifdef CONFIG_MODULES 1427 1428# By default, build modules as well 1429 1430all: modules 1431 1432# When we're building modules with modversions, we need to consider 1433# the built-in objects during the descend as well, in order to 1434# make sure the checksums are up to date before we record them. 1435ifdef CONFIG_MODVERSIONS 1436 KBUILD_BUILTIN := 1 1437endif 1438 1439# Build modules 1440# 1441# A module can be listed more than once in obj-m resulting in 1442# duplicate lines in modules.order files. Those are removed 1443# using awk while concatenating to the final file. 1444 1445PHONY += modules 1446modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1447 1448cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1449 1450modules.order: $(subdir-modorder) FORCE 1451 $(call if_changed,modules_order) 1452 1453targets += modules.order 1454 1455# Target to prepare building external modules 1456PHONY += modules_prepare 1457modules_prepare: prepare 1458 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1459 1460export modules_sign_only := 1461 1462ifeq ($(CONFIG_MODULE_SIG),y) 1463PHONY += modules_sign 1464modules_sign: modules_install 1465 @: 1466 1467# modules_sign is a subset of modules_install. 1468# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1469ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1470modules_sign_only := y 1471endif 1472endif 1473 1474modinst_pre := 1475ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1476modinst_pre := __modinst_pre 1477endif 1478 1479modules_install: $(modinst_pre) 1480PHONY += __modinst_pre 1481__modinst_pre: 1482 @rm -rf $(MODLIB)/kernel 1483 @rm -f $(MODLIB)/source 1484 @mkdir -p $(MODLIB)/kernel 1485 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1486 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1487 rm -f $(MODLIB)/build ; \ 1488 ln -s $(CURDIR) $(MODLIB)/build ; \ 1489 fi 1490 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1491 @cp -f modules.builtin $(MODLIB)/ 1492 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1493 1494endif # CONFIG_MODULES 1495 1496### 1497# Cleaning is done on three levels. 1498# make clean Delete most generated files 1499# Leave enough to build external modules 1500# make mrproper Delete the current configuration, and all generated files 1501# make distclean Remove editor backup files, patch leftover files and the like 1502 1503# Directories & files removed with 'make clean' 1504CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1505 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1506 compile_commands.json .thinlto-cache 1507 1508# Directories & files removed with 'make mrproper' 1509MRPROPER_FILES += include/config include/generated \ 1510 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1511 debian snap tar-install \ 1512 .config .config.old .version \ 1513 Module.symvers \ 1514 certs/signing_key.pem certs/signing_key.x509 \ 1515 certs/x509.genkey \ 1516 vmlinux-gdb.py \ 1517 *.spec 1518 1519# clean - Delete most, but leave enough to build external modules 1520# 1521clean: rm-files := $(CLEAN_FILES) 1522 1523PHONY += archclean vmlinuxclean 1524 1525vmlinuxclean: 1526 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1527 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1528 1529clean: archclean vmlinuxclean resolve_btfids_clean 1530 1531# mrproper - Delete all generated files, including .config 1532# 1533mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1534mrproper-dirs := $(addprefix _mrproper_,scripts) 1535 1536PHONY += $(mrproper-dirs) mrproper 1537$(mrproper-dirs): 1538 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1539 1540mrproper: clean $(mrproper-dirs) 1541 $(call cmd,rmfiles) 1542 1543# distclean 1544# 1545PHONY += distclean 1546 1547distclean: mrproper 1548 @find . $(RCS_FIND_IGNORE) \ 1549 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1550 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1551 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1552 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1553 -type f -print | xargs rm -f 1554 1555 1556# Packaging of the kernel to various formats 1557# --------------------------------------------------------------------------- 1558 1559%src-pkg: FORCE 1560 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1561%pkg: include/config/kernel.release FORCE 1562 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1563 1564# Brief documentation of the typical targets used 1565# --------------------------------------------------------------------------- 1566 1567boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1568boards := $(sort $(notdir $(boards))) 1569board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1570board-dirs := $(sort $(notdir $(board-dirs:/=))) 1571 1572PHONY += help 1573help: 1574 @echo 'Cleaning targets:' 1575 @echo ' clean - Remove most generated files but keep the config and' 1576 @echo ' enough build support to build external modules' 1577 @echo ' mrproper - Remove all generated files + config + various backup files' 1578 @echo ' distclean - mrproper + remove editor backup and patch files' 1579 @echo '' 1580 @echo 'Configuration targets:' 1581 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1582 @echo '' 1583 @echo 'Other generic targets:' 1584 @echo ' all - Build all targets marked with [*]' 1585 @echo '* vmlinux - Build the bare kernel' 1586 @echo '* modules - Build all modules' 1587 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1588 @echo ' dir/ - Build all files in dir and below' 1589 @echo ' dir/file.[ois] - Build specified target only' 1590 @echo ' dir/file.ll - Build the LLVM assembly file' 1591 @echo ' (requires compiler support for LLVM assembly generation)' 1592 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1593 @echo ' (requires a recent binutils and recent build (System.map))' 1594 @echo ' dir/file.ko - Build module including final link' 1595 @echo ' modules_prepare - Set up for building external modules' 1596 @echo ' tags/TAGS - Generate tags file for editors' 1597 @echo ' cscope - Generate cscope index' 1598 @echo ' gtags - Generate GNU GLOBAL index' 1599 @echo ' kernelrelease - Output the release version string (use with make -s)' 1600 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1601 @echo ' image_name - Output the image name (use with make -s)' 1602 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1603 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1604 echo '' 1605 @echo 'Static analysers:' 1606 @echo ' checkstack - Generate a list of stack hogs' 1607 @echo ' versioncheck - Sanity check on version.h usage' 1608 @echo ' includecheck - Check for duplicate included header files' 1609 @echo ' export_report - List the usages of all exported symbols' 1610 @echo ' headerdep - Detect inclusion cycles in headers' 1611 @echo ' coccicheck - Check with Coccinelle' 1612 @echo ' clang-analyzer - Check with clang static analyzer' 1613 @echo ' clang-tidy - Check with clang-tidy' 1614 @echo '' 1615 @echo 'Tools:' 1616 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1617 @echo '' 1618 @echo 'Kernel selftest:' 1619 @echo ' kselftest - Build and run kernel selftest' 1620 @echo ' Build, install, and boot kernel before' 1621 @echo ' running kselftest on it' 1622 @echo ' Run as root for full coverage' 1623 @echo ' kselftest-all - Build kernel selftest' 1624 @echo ' kselftest-install - Build and install kernel selftest' 1625 @echo ' kselftest-clean - Remove all generated kselftest files' 1626 @echo ' kselftest-merge - Merge all the config dependencies of' 1627 @echo ' kselftest to existing .config.' 1628 @echo '' 1629 @$(if $(dtstree), \ 1630 echo 'Devicetree:'; \ 1631 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1632 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1633 echo ' dt_binding_check - Validate device tree binding documents'; \ 1634 echo ' dtbs_check - Validate device tree source files';\ 1635 echo '') 1636 1637 @echo 'Userspace tools targets:' 1638 @echo ' use "make tools/help"' 1639 @echo ' or "cd tools; make help"' 1640 @echo '' 1641 @echo 'Kernel packaging:' 1642 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1643 @echo '' 1644 @echo 'Documentation targets:' 1645 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1646 @echo '' 1647 @echo 'Architecture specific targets ($(SRCARCH)):' 1648 @$(if $(archhelp),$(archhelp),\ 1649 echo ' No architecture specific help defined for $(SRCARCH)') 1650 @echo '' 1651 @$(if $(boards), \ 1652 $(foreach b, $(boards), \ 1653 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1654 echo '') 1655 @$(if $(board-dirs), \ 1656 $(foreach b, $(board-dirs), \ 1657 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1658 printf " %-16s - Show all of the above\\n" help-boards; \ 1659 echo '') 1660 1661 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1662 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1663 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1664 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1665 @echo ' (sparse by default)' 1666 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1667 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1668 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1669 @echo ' 1: warnings which may be relevant and do not occur too often' 1670 @echo ' 2: warnings which occur quite often but may still be relevant' 1671 @echo ' 3: more obscure warnings, can most likely be ignored' 1672 @echo ' Multiple levels can be combined with W=12 or W=123' 1673 @echo '' 1674 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1675 @echo 'For further info see the ./README file' 1676 1677 1678help-board-dirs := $(addprefix help-,$(board-dirs)) 1679 1680help-boards: $(help-board-dirs) 1681 1682boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1683 1684$(help-board-dirs): help-%: 1685 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1686 @$(if $(boards-per-dir), \ 1687 $(foreach b, $(boards-per-dir), \ 1688 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1689 echo '') 1690 1691 1692# Documentation targets 1693# --------------------------------------------------------------------------- 1694DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1695 linkcheckdocs dochelp refcheckdocs 1696PHONY += $(DOC_TARGETS) 1697$(DOC_TARGETS): 1698 $(Q)$(MAKE) $(build)=Documentation $@ 1699 1700# Misc 1701# --------------------------------------------------------------------------- 1702 1703PHONY += scripts_gdb 1704scripts_gdb: prepare0 1705 $(Q)$(MAKE) $(build)=scripts/gdb 1706 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1707 1708ifdef CONFIG_GDB_SCRIPTS 1709all: scripts_gdb 1710endif 1711 1712else # KBUILD_EXTMOD 1713 1714### 1715# External module support. 1716# When building external modules the kernel used as basis is considered 1717# read-only, and no consistency checks are made and the make 1718# system is not used on the basis kernel. If updates are required 1719# in the basis kernel ordinary make commands (without M=...) must be used. 1720 1721# We are always building only modules. 1722KBUILD_BUILTIN := 1723KBUILD_MODULES := 1 1724 1725build-dirs := $(KBUILD_EXTMOD) 1726$(MODORDER): descend 1727 @: 1728 1729compile_commands.json: $(extmod_prefix)compile_commands.json 1730PHONY += compile_commands.json 1731 1732clean-dirs := $(KBUILD_EXTMOD) 1733clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1734 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1735 1736PHONY += help 1737help: 1738 @echo ' Building external modules.' 1739 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1740 @echo '' 1741 @echo ' modules - default target, build the module(s)' 1742 @echo ' modules_install - install the module' 1743 @echo ' clean - remove generated files in module directory only' 1744 @echo '' 1745 1746# no-op for external module builds 1747PHONY += prepare modules_prepare 1748 1749endif # KBUILD_EXTMOD 1750 1751# --------------------------------------------------------------------------- 1752# Modules 1753 1754PHONY += modules modules_install 1755 1756ifdef CONFIG_MODULES 1757 1758modules: modules_check 1759 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1760 1761PHONY += modules_check 1762modules_check: $(MODORDER) 1763 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1764 1765quiet_cmd_depmod = DEPMOD $(MODLIB) 1766 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1767 $(KERNELRELEASE) 1768 1769modules_install: 1770 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1771 $(call cmd,depmod) 1772 1773else # CONFIG_MODULES 1774 1775# Modules not configured 1776# --------------------------------------------------------------------------- 1777 1778modules modules_install: 1779 @echo >&2 '***' 1780 @echo >&2 '*** The present kernel configuration has modules disabled.' 1781 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1782 @echo >&2 '*** to enable CONFIG_MODULES.' 1783 @echo >&2 '***' 1784 @exit 1 1785 1786endif # CONFIG_MODULES 1787 1788# Single targets 1789# --------------------------------------------------------------------------- 1790# To build individual files in subdirectories, you can do like this: 1791# 1792# make foo/bar/baz.s 1793# 1794# The supported suffixes for single-target are listed in 'single-targets' 1795# 1796# To build only under specific subdirectories, you can do like this: 1797# 1798# make foo/bar/baz/ 1799 1800ifdef single-build 1801 1802# .ko is special because modpost is needed 1803single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1804single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1805 1806$(single-ko): single_modpost 1807 @: 1808$(single-no-ko): descend 1809 @: 1810 1811ifeq ($(KBUILD_EXTMOD),) 1812# For the single build of in-tree modules, use a temporary file to avoid 1813# the situation of modules_install installing an invalid modules.order. 1814MODORDER := .modules.tmp 1815endif 1816 1817PHONY += single_modpost 1818single_modpost: $(single-no-ko) modules_prepare 1819 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1820 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1821 1822KBUILD_MODULES := 1 1823 1824export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1825 1826# trim unrelated directories 1827build-dirs := $(foreach d, $(build-dirs), \ 1828 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1829 1830endif 1831 1832ifndef CONFIG_MODULES 1833KBUILD_MODULES := 1834endif 1835 1836# Handle descending into subdirectories listed in $(build-dirs) 1837# Preset locale variables to speed up the build process. Limit locale 1838# tweaks to this spot to avoid wrong language settings when running 1839# make menuconfig etc. 1840# Error messages still appears in the original language 1841PHONY += descend $(build-dirs) 1842descend: $(build-dirs) 1843$(build-dirs): prepare 1844 $(Q)$(MAKE) $(build)=$@ \ 1845 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1846 need-builtin=1 need-modorder=1 1847 1848clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1849PHONY += $(clean-dirs) clean 1850$(clean-dirs): 1851 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1852 1853clean: $(clean-dirs) 1854 $(call cmd,rmfiles) 1855 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1856 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1857 -o -name '*.ko.*' \ 1858 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1859 -o -name '*.dwo' -o -name '*.lst' \ 1860 -o -name '*.su' -o -name '*.mod' \ 1861 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1862 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1863 -o -name '*.asn1.[ch]' \ 1864 -o -name '*.symtypes' -o -name 'modules.order' \ 1865 -o -name '.tmp_*.o.*' \ 1866 -o -name '*.c.[012]*.*' \ 1867 -o -name '*.ll' \ 1868 -o -name '*.gcno' \ 1869 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1870 1871# Generate tags for editors 1872# --------------------------------------------------------------------------- 1873quiet_cmd_tags = GEN $@ 1874 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1875 1876tags TAGS cscope gtags: FORCE 1877 $(call cmd,tags) 1878 1879# Script to generate missing namespace dependencies 1880# --------------------------------------------------------------------------- 1881 1882PHONY += nsdeps 1883nsdeps: export KBUILD_NSDEPS=1 1884nsdeps: modules 1885 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1886 1887# Clang Tooling 1888# --------------------------------------------------------------------------- 1889 1890quiet_cmd_gen_compile_commands = GEN $@ 1891 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1892 1893$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1894 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1895 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1896 $(call if_changed,gen_compile_commands) 1897 1898targets += $(extmod_prefix)compile_commands.json 1899 1900PHONY += clang-tidy clang-analyzer 1901 1902ifdef CONFIG_CC_IS_CLANG 1903quiet_cmd_clang_tools = CHECK $< 1904 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1905 1906clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1907 $(call cmd,clang_tools) 1908else 1909clang-tidy clang-analyzer: 1910 @echo "$@ requires CC=clang" >&2 1911 @false 1912endif 1913 1914# Scripts to check various things for consistency 1915# --------------------------------------------------------------------------- 1916 1917PHONY += includecheck versioncheck coccicheck export_report 1918 1919includecheck: 1920 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1921 -name '*.[hcS]' -type f -print | sort \ 1922 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1923 1924versioncheck: 1925 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1926 -name '*.[hcS]' -type f -print | sort \ 1927 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1928 1929coccicheck: 1930 $(Q)$(BASH) $(srctree)/scripts/$@ 1931 1932export_report: 1933 $(PERL) $(srctree)/scripts/export_report.pl 1934 1935PHONY += checkstack kernelrelease kernelversion image_name 1936 1937# UML needs a little special treatment here. It wants to use the host 1938# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1939# else wants $(ARCH), including people doing cross-builds, which means 1940# that $(SUBARCH) doesn't work here. 1941ifeq ($(ARCH), um) 1942CHECKSTACK_ARCH := $(SUBARCH) 1943else 1944CHECKSTACK_ARCH := $(ARCH) 1945endif 1946checkstack: 1947 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1948 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1949 1950kernelrelease: 1951 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1952 1953kernelversion: 1954 @echo $(KERNELVERSION) 1955 1956image_name: 1957 @echo $(KBUILD_IMAGE) 1958 1959# Clear a bunch of variables before executing the submake 1960 1961ifeq ($(quiet),silent_) 1962tools_silent=s 1963endif 1964 1965tools/: FORCE 1966 $(Q)mkdir -p $(objtree)/tools 1967 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1968 1969tools/%: FORCE 1970 $(Q)mkdir -p $(objtree)/tools 1971 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1972 1973quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1974 cmd_rmfiles = rm -rf $(rm-files) 1975 1976# read saved command lines for existing targets 1977existing-targets := $(wildcard $(sort $(targets))) 1978 1979-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1980 1981endif # config-build 1982endif # mixed-build 1983endif # need-sub-make 1984 1985PHONY += FORCE 1986FORCE: 1987 1988# Declare the contents of the PHONY variable as phony. We keep that 1989# information in a variable so we can use it in if_changed and friends. 1990.PHONY: $(PHONY) 1991