1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 10 4SUBLEVEL = 137 5EXTRAVERSION = 6NAME = Dare mighty things 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 --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(KBUILD_OUTPUT),) 129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130# expand a shell special character '~'. We use a somewhat tedious way here. 131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132$(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135# $(realpath ...) resolves symlinks 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183# Invoke a second make in the output directory, passing relevant variables 184__sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(need-sub-make),) 192 193# Do not print "Entering directory ...", 194# but we want to display it when entering to the output directory 195# so that IDEs/editors are able to understand relative filenames. 196MAKEFLAGS += --no-print-directory 197 198# Call a source code checker (by default, "sparse") as part of the 199# C compilation. 200# 201# Use 'make C=1' to enable checking of only re-compiled files. 202# Use 'make C=2' to enable checking of *all* source files, regardless 203# of whether they are re-compiled or not. 204# 205# See the file "Documentation/dev-tools/sparse.rst" for more details, 206# including where to get the "sparse" utility. 207 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 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 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 269 image_name 270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 271 272config-build := 273mixed-build := 274need-config := 1 275may-sync-config := 1 276single-build := 277 278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 280 need-config := 281 endif 282endif 283 284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 286 may-sync-config := 287 endif 288endif 289 290ifneq ($(KBUILD_EXTMOD),) 291 may-sync-config := 292endif 293 294ifeq ($(KBUILD_EXTMOD),) 295 ifneq ($(filter %config,$(MAKECMDGOALS)),) 296 config-build := 1 297 ifneq ($(words $(MAKECMDGOALS)),1) 298 mixed-build := 1 299 endif 300 endif 301endif 302 303# We cannot build single targets and the others at the same time 304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 305 single-build := 1 306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 307 mixed-build := 1 308 endif 309endif 310 311# For "make -j clean all", "make -j mrproper defconfig all", etc. 312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 314 mixed-build := 1 315 endif 316endif 317 318# install and modules_install need also be processed one by one 319ifneq ($(filter install,$(MAKECMDGOALS)),) 320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325ifdef mixed-build 326# =========================================================================== 327# We're called with mixed targets (*config and build targets). 328# Handle them one by one. 329 330PHONY += $(MAKECMDGOALS) __build_one_by_one 331 332$(MAKECMDGOALS): __build_one_by_one 333 @: 334 335__build_one_by_one: 336 $(Q)set -e; \ 337 for i in $(MAKECMDGOALS); do \ 338 $(MAKE) -f $(srctree)/Makefile $$i; \ 339 done 340 341else # !mixed-build 342 343include scripts/Kbuild.include 344 345# Read KERNELRELEASE from include/config/kernel.release (if it exists) 346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 349 350include scripts/subarch.include 351 352# Cross compiling and selecting different set of gcc/bin-utils 353# --------------------------------------------------------------------------- 354# 355# When performing cross compilation for other architectures ARCH shall be set 356# to the target architecture. (See arch/* for the possibilities). 357# ARCH can be set during invocation of make: 358# make ARCH=ia64 359# Another way is to have ARCH set in the environment. 360# The default ARCH is the host where make is executed. 361 362# CROSS_COMPILE specify the prefix used for all executables used 363# during compilation. Only gcc and related bin-utils executables 364# are prefixed with $(CROSS_COMPILE). 365# CROSS_COMPILE can be set on the command line 366# make CROSS_COMPILE=ia64-linux- 367# Alternatively CROSS_COMPILE can be set in the environment. 368# Default value for CROSS_COMPILE is not to prefix executables 369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 370ARCH ?= $(SUBARCH) 371 372# Architecture as present in compile.h 373UTS_MACHINE := $(ARCH) 374SRCARCH := $(ARCH) 375 376# Additional ARCH settings for x86 377ifeq ($(ARCH),i386) 378 SRCARCH := x86 379endif 380ifeq ($(ARCH),x86_64) 381 SRCARCH := x86 382endif 383 384# Additional ARCH settings for sparc 385ifeq ($(ARCH),sparc32) 386 SRCARCH := sparc 387endif 388ifeq ($(ARCH),sparc64) 389 SRCARCH := sparc 390endif 391 392# Additional ARCH settings for sh 393ifeq ($(ARCH),sh64) 394 SRCARCH := sh 395endif 396 397KCONFIG_CONFIG ?= .config 398export KCONFIG_CONFIG 399 400# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 401export KBUILD_DEFCONFIG := defconfig 402 403# SHELL used by kbuild 404CONFIG_SHELL := sh 405 406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 409 410ifneq ($(LLVM),) 411HOSTCC = clang 412HOSTCXX = clang++ 413else 414HOSTCC = gcc 415HOSTCXX = g++ 416endif 417 418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 419 -O2 -fomit-frame-pointer -std=gnu89 420export KBUILD_USERLDFLAGS := 421 422KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 424KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 425KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 426 427# Make variables (CC, etc...) 428CPP = $(CC) -E 429CCACHE = ccache 430ifneq ($(LLVM),) 431CC = $(CCACHE) clang 432LD = ld.lld 433AR = llvm-ar 434NM = llvm-nm 435OBJCOPY = llvm-objcopy 436OBJDUMP = llvm-objdump 437READELF = llvm-readelf 438STRIP = llvm-strip 439else 440CC = $(CCACHE) $(CROSS_COMPILE)gcc 441LD = $(CROSS_COMPILE)ld 442AR = $(CROSS_COMPILE)ar 443NM = $(CROSS_COMPILE)nm 444OBJCOPY = $(CROSS_COMPILE)objcopy 445OBJDUMP = $(CROSS_COMPILE)objdump 446READELF = $(CROSS_COMPILE)readelf 447STRIP = $(CROSS_COMPILE)strip 448endif 449PAHOLE = pahole 450RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 451LEX = flex 452YACC = bison 453AWK = awk 454INSTALLKERNEL := installkernel 455DEPMOD = depmod 456PERL = perl 457PYTHON = python 458PYTHON3 = python3 459CHECK = sparse 460BASH = bash 461KGZIP = gzip 462KBZIP2 = bzip2 463KLZOP = lzop 464LZMA = lzma 465LZ4 = lz4c 466XZ = xz 467ZSTD = zstd 468 469CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 471NOSTDINC_FLAGS := 472CFLAGS_MODULE = 473AFLAGS_MODULE = 474LDFLAGS_MODULE = 475CFLAGS_KERNEL = 476AFLAGS_KERNEL = 477LDFLAGS_vmlinux = 478 479# Use USERINCLUDE when you must reference the UAPI directories only. 480USERINCLUDE := \ 481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 483 -I$(srctree)/include/uapi \ 484 -I$(objtree)/include/generated/uapi \ 485 -include $(srctree)/include/linux/kconfig.h 486 487# Use LINUXINCLUDE when you must reference the include/ directory. 488# Needed to be compatible with the O= option 489LINUXINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 492 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 493 -I$(objtree)/include \ 494 -I$(objtree)/vendor/include \ 495 $(USERINCLUDE) 496 497KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 498KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 499 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 500 -Werror=implicit-function-declaration -Werror=implicit-int \ 501 -Werror=return-type -Wno-format-security \ 502 -std=gnu89 503KBUILD_CPPFLAGS := -D__KERNEL__ 504KBUILD_AFLAGS_KERNEL := 505KBUILD_CFLAGS_KERNEL := 506KBUILD_AFLAGS_MODULE := -DMODULE 507KBUILD_CFLAGS_MODULE := -DMODULE 508KBUILD_LDFLAGS_MODULE := 509KBUILD_LDFLAGS := 510CLANG_FLAGS := 511 512export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 513export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 514export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 515export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 516export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 517 518export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 519export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 520export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 521export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 522export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 523 524# Files to ignore in find ... statements 525 526export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 527 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 528 -prune -o 529export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 530 --exclude CVS --exclude .pc --exclude .hg --exclude .git 531 532# =========================================================================== 533# Rules shared between *config targets and build targets 534 535# Basic helpers built in scripts/basic/ 536PHONY += scripts_basic 537scripts_basic: 538 $(Q)$(MAKE) $(build)=scripts/basic 539 $(Q)rm -f .tmp_quiet_recordmcount 540 541PHONY += outputmakefile 542# Before starting out-of-tree build, make sure the source tree is clean. 543# outputmakefile generates a Makefile in the output directory, if using a 544# separate output directory. This allows convenient use of make in the 545# output directory. 546# At the same time when output Makefile generated, generate .gitignore to 547# ignore whole output directory 548outputmakefile: 549ifdef building_out_of_srctree 550 $(Q)if [ -f $(srctree)/.config -o \ 551 -d $(srctree)/include/config -o \ 552 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 553 echo >&2 "***"; \ 554 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 555 echo >&2 "*** in $(abs_srctree)";\ 556 echo >&2 "***"; \ 557 false; \ 558 fi 559 $(Q)ln -fsn $(srctree) source 560 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 561 $(Q)test -e .gitignore || \ 562 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 563endif 564 565ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 566ifneq ($(CROSS_COMPILE),) 567CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 568GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 569CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 570GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 571endif 572ifneq ($(GCC_TOOLCHAIN),) 573CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 574endif 575ifneq ($(LLVM_IAS),1) 576CLANG_FLAGS += -no-integrated-as 577endif 578CLANG_FLAGS += -Werror=unknown-warning-option 579KBUILD_CFLAGS += $(CLANG_FLAGS) 580KBUILD_AFLAGS += $(CLANG_FLAGS) 581export CLANG_FLAGS 582endif 583 584# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 585# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 586# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 587# and from include/config/auto.conf.cmd to detect the compiler upgrade. 588CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 589 590ifdef config-build 591# =========================================================================== 592# *config targets only - make sure prerequisites are updated, and descend 593# in scripts/kconfig to make the *config target 594 595# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 596# KBUILD_DEFCONFIG may point out an alternative default configuration 597# used for 'make defconfig' 598include arch/$(SRCARCH)/Makefile 599export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 600 601config: outputmakefile scripts_basic FORCE 602 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 603 604%config: outputmakefile scripts_basic FORCE 605 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 606 607else #!config-build 608# =========================================================================== 609# Build targets only - this includes vmlinux, arch specific targets, clean 610# targets and others. In general all targets except *config targets. 611 612# If building an external module we do not care about the all: rule 613# but instead __all depend on modules 614PHONY += all 615ifeq ($(KBUILD_EXTMOD),) 616__all: all 617else 618__all: modules 619endif 620 621# Decide whether to build built-in, modular, or both. 622# Normally, just do built-in. 623 624KBUILD_MODULES := 625KBUILD_BUILTIN := 1 626 627# If we have only "make modules", don't compile built-in objects. 628ifeq ($(MAKECMDGOALS),modules) 629 KBUILD_BUILTIN := 630endif 631 632# If we have "make <whatever> modules", compile modules 633# in addition to whatever we do anyway. 634# Just "make" or "make all" shall build modules as well 635 636ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 637 KBUILD_MODULES := 1 638endif 639 640ifeq ($(MAKECMDGOALS),) 641 KBUILD_MODULES := 1 642endif 643 644export KBUILD_MODULES KBUILD_BUILTIN 645 646ifdef need-config 647include include/config/auto.conf 648endif 649 650ifeq ($(KBUILD_EXTMOD),) 651# Objects we will link into vmlinux / subdirs we need to visit 652core-y := init/ usr/ 653drivers-y := drivers/ sound/ 654drivers-$(CONFIG_SAMPLES) += samples/ 655drivers-y += net/ virt/ 656libs-y := lib/ 657vendor-y := vendor/ 658endif # KBUILD_EXTMOD 659 660# The all: target is the default when no target is given on the 661# command line. 662# This allow a user to issue only 'make' to build a kernel including modules 663# Defaults to vmlinux, but the arch makefile usually adds further targets 664all: vmlinux 665 666CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 667 $(call cc-option,-fno-tree-loop-im) \ 668 $(call cc-disable-warning,maybe-uninitialized,) 669export CFLAGS_GCOV 670 671# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 672ifdef CONFIG_FUNCTION_TRACER 673 CC_FLAGS_FTRACE := -pg 674endif 675 676ifdef CONFIG_CC_IS_GCC 677RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 678RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix) 679RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 680endif 681ifdef CONFIG_CC_IS_CLANG 682RETPOLINE_CFLAGS := -mretpoline-external-thunk 683RETPOLINE_VDSO_CFLAGS := -mretpoline 684endif 685 686ifdef CONFIG_RETHUNK 687RETHUNK_CFLAGS := -mfunction-return=thunk-extern 688RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) 689endif 690export RETPOLINE_CFLAGS 691export RETPOLINE_VDSO_CFLAGS 692 693include arch/$(SRCARCH)/Makefile 694 695ifdef need-config 696ifdef may-sync-config 697# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 698# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 699# because some architectures define CROSS_COMPILE there. 700include include/config/auto.conf.cmd 701 702$(KCONFIG_CONFIG): 703 @echo >&2 '***' 704 @echo >&2 '*** Configuration file "$@" not found!' 705 @echo >&2 '***' 706 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 707 @echo >&2 '*** "make menuconfig" or "make xconfig").' 708 @echo >&2 '***' 709 @/bin/false 710 711# The actual configuration files used during the build are stored in 712# include/generated/ and include/config/. Update them if .config is newer than 713# include/config/auto.conf (which mirrors .config). 714# 715# This exploits the 'multi-target pattern rule' trick. 716# The syncconfig should be executed only once to make all the targets. 717# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 718# 719# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 720# so you cannot notice that Kconfig is waiting for the user input. 721%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 722 $(Q)$(kecho) " SYNC $@" 723 $(Q)$(MAKE) -f $(srctree)/Makefile 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 828DEBUG_CFLAGS := 829 830# Workaround for GCC versions < 5.0 831# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 832ifdef CONFIG_CC_IS_GCC 833DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 834endif 835 836ifdef CONFIG_DEBUG_INFO 837 838ifdef CONFIG_DEBUG_INFO_SPLIT 839DEBUG_CFLAGS += -gsplit-dwarf 840else 841DEBUG_CFLAGS += -g 842endif 843 844ifneq ($(LLVM_IAS),1) 845KBUILD_AFLAGS += -Wa,-gdwarf-2 846endif 847 848ifdef CONFIG_DEBUG_INFO_DWARF4 849DEBUG_CFLAGS += -gdwarf-4 850endif 851 852ifdef CONFIG_DEBUG_INFO_REDUCED 853DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 854 $(call cc-option,-fno-var-tracking) 855endif 856 857ifdef CONFIG_DEBUG_INFO_COMPRESSED 858DEBUG_CFLAGS += -gz=zlib 859KBUILD_AFLAGS += -gz=zlib 860KBUILD_LDFLAGS += --compress-debug-sections=zlib 861endif 862 863endif # CONFIG_DEBUG_INFO 864KBUILD_CFLAGS += -Wno-unused-function 865KBUILD_CFLAGS += $(DEBUG_CFLAGS) 866export DEBUG_CFLAGS 867 868ifdef CONFIG_FUNCTION_TRACER 869ifdef CONFIG_FTRACE_MCOUNT_USE_CC 870 CC_FLAGS_FTRACE += -mrecord-mcount 871 ifdef CONFIG_HAVE_NOP_MCOUNT 872 ifeq ($(call cc-option-yn, -mnop-mcount),y) 873 CC_FLAGS_FTRACE += -mnop-mcount 874 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 875 endif 876 endif 877endif 878ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 879 ifdef CONFIG_HAVE_C_RECORDMCOUNT 880 BUILD_C_RECORDMCOUNT := y 881 export BUILD_C_RECORDMCOUNT 882 endif 883endif 884ifdef CONFIG_HAVE_FENTRY 885 ifeq ($(call cc-option-yn, -mfentry),y) 886 CC_FLAGS_FTRACE += -mfentry 887 CC_FLAGS_USING += -DCC_USING_FENTRY 888 endif 889endif 890export CC_FLAGS_FTRACE 891KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 892KBUILD_AFLAGS += $(CC_FLAGS_USING) 893endif 894 895# We trigger additional mismatches with less inlining 896ifdef CONFIG_DEBUG_SECTION_MISMATCH 897KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 898endif 899 900ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 901KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 902LDFLAGS_vmlinux += --gc-sections 903endif 904 905ifdef CONFIG_SHADOW_CALL_STACK 906CC_FLAGS_SCS := -fsanitize=shadow-call-stack 907KBUILD_CFLAGS += $(CC_FLAGS_SCS) 908export CC_FLAGS_SCS 909endif 910ifdef CONFIG_LTO_CLANG 911ifdef CONFIG_LTO_CLANG_THIN 912CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 913KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 914else 915CC_FLAGS_LTO := -flto 916endif 917CC_FLAGS_LTO += -fvisibility=hidden 918# Limit inlining across translation units to reduce binary size 919KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 920endif 921ifdef CONFIG_LTO 922KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 923KBUILD_AFLAGS += -fno-lto 924export CC_FLAGS_LTO 925endif 926ifdef CONFIG_CFI_CLANG 927CC_FLAGS_CFI := -fsanitize=cfi \ 928 -fsanitize-cfi-cross-dso \ 929 -fno-sanitize-cfi-canonical-jump-tables \ 930 -fno-sanitize-trap=cfi \ 931 -fno-sanitize-blacklist 932ifdef CONFIG_CFI_PERMISSIVE 933CC_FLAGS_CFI += -fsanitize-recover=cfi 934endif 935# If LTO flags are filtered out, we must also filter out CFI. 936CC_FLAGS_LTO += $(CC_FLAGS_CFI) 937KBUILD_CFLAGS += $(CC_FLAGS_CFI) 938export CC_FLAGS_CFI 939endif 940 941ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 942KBUILD_CFLAGS += -falign-functions=32 943endif 944 945# arch Makefile may override CC so keep this after arch Makefile is included 946NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 947 948# warn about C99 declaration after statement 949KBUILD_CFLAGS += -Wdeclaration-after-statement 950 951# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 952KBUILD_CFLAGS += -Wvla 953 954# disable pointer signed / unsigned warnings in gcc 4.0 955KBUILD_CFLAGS += -Wno-pointer-sign 956 957# disable stringop warnings in gcc 8+ 958KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 959 960# We'll want to enable this eventually, but it's not going away for 5.7 at least 961KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 962KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 963KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 964 965# Another good warning that we'll want to enable eventually 966KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 967 968# Enabled with W=2, disabled by default as noisy 969KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 970 971# disable invalid "can't wrap" optimizations for signed / pointers 972KBUILD_CFLAGS += -fno-strict-overflow 973 974# Make sure -fstack-check isn't enabled (like gentoo apparently did) 975KBUILD_CFLAGS += -fno-stack-check 976 977# conserve stack if available 978KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 979 980# Prohibit date/time macros, which would make the build non-deterministic 981KBUILD_CFLAGS += -Werror=date-time 982 983# enforce correct pointer usage 984#KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 985 986# Require designated initializers for all marked structures 987KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 988 989# change __FILE__ to the relative path from the srctree 990KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 991 992# include additional Makefiles when needed 993include-y := scripts/Makefile.extrawarn 994include-$(CONFIG_KASAN) += scripts/Makefile.kasan 995include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 996include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 997include-$(CONFIG_KCOV) += scripts/Makefile.kcov 998include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 999 1000include $(addprefix $(srctree)/, $(include-y)) 1001 1002# scripts/Makefile.gcc-plugins is intentionally included last. 1003# Do not add $(call cc-option,...) below this line. When you build the kernel 1004# from the clean source tree, the GCC plugins do not exist at this point. 1005 1006# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1007KBUILD_CPPFLAGS += $(KCPPFLAGS) 1008KBUILD_AFLAGS += $(KAFLAGS) 1009KBUILD_CFLAGS += $(KCFLAGS) 1010 1011KBUILD_LDFLAGS_MODULE += --build-id=sha1 1012LDFLAGS_vmlinux += --build-id=sha1 1013KBUILD_LDFLAGS += -z noexecstack 1014KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1015 1016ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1017LDFLAGS_vmlinux += $(call ld-option, -X,) 1018endif 1019 1020ifeq ($(CONFIG_RELR),y) 1021LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1022endif 1023 1024# We never want expected sections to be placed heuristically by the 1025# linker. All sections should be explicitly named in the linker script. 1026ifdef CONFIG_LD_ORPHAN_WARN 1027LDFLAGS_vmlinux += --orphan-handling=warn 1028endif 1029 1030# Align the bit size of userspace programs with the kernel 1031KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1032KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1033 1034# make the checker run with the right architecture 1035CHECKFLAGS += --arch=$(ARCH) 1036 1037# insure the checker run with the right endianness 1038CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1039 1040# the checker needs the correct machine size 1041CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1042 1043# Default kernel image to build when no specific target is given. 1044# KBUILD_IMAGE may be overruled on the command line or 1045# set in the environment 1046# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1047# this default value 1048export KBUILD_IMAGE ?= vmlinux 1049 1050# 1051# INSTALL_PATH specifies where to place the updated kernel and system map 1052# images. Default is /boot, but you can set it to other values 1053export INSTALL_PATH ?= /boot 1054 1055# 1056# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1057# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1058# an argument if needed. Otherwise it defaults to the kernel install path 1059# 1060export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1061 1062# 1063# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1064# relocations required by build roots. This is not defined in the 1065# makefile but the argument can be passed to make if needed. 1066# 1067 1068MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1069export MODLIB 1070 1071# 1072# INSTALL_MOD_STRIP, if defined, will cause modules to be 1073# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1074# the default option --strip-debug will be used. Otherwise, 1075# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1076 1077ifdef INSTALL_MOD_STRIP 1078ifeq ($(INSTALL_MOD_STRIP),1) 1079mod_strip_cmd = $(STRIP) --strip-debug 1080else 1081mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1082endif # INSTALL_MOD_STRIP=1 1083else 1084mod_strip_cmd = true 1085endif # INSTALL_MOD_STRIP 1086export mod_strip_cmd 1087 1088# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1089# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1090# or CONFIG_MODULE_COMPRESS_XZ. 1091 1092mod_compress_cmd = true 1093ifdef CONFIG_MODULE_COMPRESS 1094 ifdef CONFIG_MODULE_COMPRESS_GZIP 1095 mod_compress_cmd = $(KGZIP) -n -f 1096 endif # CONFIG_MODULE_COMPRESS_GZIP 1097 ifdef CONFIG_MODULE_COMPRESS_XZ 1098 mod_compress_cmd = $(XZ) -f 1099 endif # CONFIG_MODULE_COMPRESS_XZ 1100endif # CONFIG_MODULE_COMPRESS 1101export mod_compress_cmd 1102 1103ifdef CONFIG_MODULE_SIG_ALL 1104$(eval $(call config_filename,MODULE_SIG_KEY)) 1105 1106mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1107else 1108mod_sign_cmd = true 1109endif 1110export mod_sign_cmd 1111 1112HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1113 1114has_libelf = $(call try-run,\ 1115 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1116 1117ifdef CONFIG_STACK_VALIDATION 1118 ifeq ($(has_libelf),1) 1119 objtool_target := tools/objtool FORCE 1120 else 1121 SKIP_STACK_VALIDATION := 1 1122 export SKIP_STACK_VALIDATION 1123 endif 1124endif 1125 1126PHONY += resolve_btfids_clean 1127 1128resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1129 1130# tools/bpf/resolve_btfids directory might not exist 1131# in output directory, skip its clean in that case 1132resolve_btfids_clean: 1133ifneq ($(wildcard $(resolve_btfids_O)),) 1134 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1135endif 1136 1137ifdef CONFIG_BPF 1138ifdef CONFIG_DEBUG_INFO_BTF 1139 ifeq ($(has_libelf),1) 1140 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1141 else 1142 ERROR_RESOLVE_BTFIDS := 1 1143 endif 1144endif # CONFIG_DEBUG_INFO_BTF 1145endif # CONFIG_BPF 1146 1147PHONY += prepare0 1148 1149export MODORDER := $(extmod-prefix)modules.order 1150export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1151 1152ifeq ($(KBUILD_EXTMOD),) 1153core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ io_uring/ 1154 1155vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1156 $(core-y) $(core-m) $(drivers-y) $(drivers-m) $(vendor-y)\ 1157 $(libs-y) $(libs-m))) 1158 1159vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1160 $(patsubst %/,%,$(filter %/, $(core-) \ 1161 $(drivers-) $(vendor-) $(libs-)))) 1162 1163subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1164 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1165 $(drivers-y) $(drivers-m) $(vendor-y))) 1166 1167build-dirs := $(vmlinux-dirs) 1168clean-dirs := $(vmlinux-alldirs) 1169 1170# Externally visible symbols (used by link-vmlinux.sh) 1171KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1172KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1173ifdef CONFIG_MODULES 1174KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1175KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1176else 1177KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1178endif 1179KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1180KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(vendor-y)) 1181 1182export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1183export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1184# used by scripts/Makefile.package 1185export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1186 1187vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1188 1189# Recurse until adjust_autoksyms.sh is satisfied 1190PHONY += autoksyms_recursive 1191ifdef CONFIG_TRIM_UNUSED_KSYMS 1192# For the kernel to actually contain only the needed exported symbols, 1193# we have to build modules as well to determine what those symbols are. 1194# (this can be evaluated only once include/config/auto.conf has been included) 1195KBUILD_MODULES := 1 1196 1197autoksyms_recursive: descend modules.order 1198 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1199 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1200endif 1201 1202autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1203 1204quiet_cmd_autoksyms_h = GEN $@ 1205 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1206 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1207 1208$(autoksyms_h): 1209 $(call cmd,autoksyms_h) 1210 1211ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1212 1213# Final link of vmlinux with optional arch pass after final link 1214cmd_link-vmlinux = \ 1215 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1216 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1217 1218vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1219 +$(call if_changed,link-vmlinux) 1220 1221targets := vmlinux 1222 1223# The actual objects are generated when descending, 1224# make sure no implicit rule kicks in 1225$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1226 1227filechk_kernel.release = \ 1228 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1229 1230# Store (new) KERNELRELEASE string in include/config/kernel.release 1231include/config/kernel.release: FORCE 1232 $(call filechk,kernel.release) 1233 1234# Additional helpers built in scripts/ 1235# Carefully list dependencies so we do not try to build scripts twice 1236# in parallel 1237PHONY += scripts 1238scripts: scripts_basic scripts_dtc 1239 $(Q)$(MAKE) $(build)=$(@) 1240 1241# Things we need to do before we recursively start building the kernel 1242# or the modules are listed in "prepare". 1243# A multi level approach is used. prepareN is processed before prepareN-1. 1244# archprepare is used in arch Makefiles and when processed asm symlink, 1245# version.h and scripts_basic is processed / created. 1246 1247PHONY += prepare archprepare 1248 1249archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1250 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1251 include/generated/autoconf.h 1252 1253prepare0: archprepare 1254 $(Q)$(MAKE) $(build)=scripts/mod 1255 $(Q)$(MAKE) $(build)=. 1256 1257# All the preparing.. 1258prepare: prepare0 prepare-objtool prepare-resolve_btfids 1259 1260# Support for using generic headers in asm-generic 1261asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1262 1263PHONY += asm-generic uapi-asm-generic 1264asm-generic: uapi-asm-generic 1265 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1266 generic=include/asm-generic 1267uapi-asm-generic: 1268 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1269 generic=include/uapi/asm-generic 1270 1271PHONY += prepare-objtool prepare-resolve_btfids 1272prepare-objtool: $(objtool_target) 1273ifeq ($(SKIP_STACK_VALIDATION),1) 1274ifdef CONFIG_UNWINDER_ORC 1275 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1276 @false 1277else 1278 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1279endif 1280endif 1281 1282prepare-resolve_btfids: $(resolve_btfids_target) 1283ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1284 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1285 @false 1286endif 1287# Generate some files 1288# --------------------------------------------------------------------------- 1289 1290# KERNELRELEASE can change from a few different places, meaning version.h 1291# needs to be updated, so this check is forced on all builds 1292 1293uts_len := 64 1294define filechk_utsrelease.h 1295 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1296 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1297 exit 1; \ 1298 fi; \ 1299 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1300endef 1301 1302define filechk_version.h 1303 if [ $(SUBLEVEL) -gt 255 ]; then \ 1304 echo \#define LINUX_VERSION_CODE $(shell \ 1305 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1306 else \ 1307 echo \#define LINUX_VERSION_CODE $(shell \ 1308 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1309 fi; \ 1310 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1311 ((c) > 255 ? 255 : (c)))' 1312endef 1313 1314$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1315$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1316$(version_h): FORCE 1317 $(call filechk,version.h) 1318 $(Q)rm -f $(old_version_h) 1319 1320include/generated/utsrelease.h: include/config/kernel.release FORCE 1321 $(call filechk,utsrelease.h) 1322 1323PHONY += headerdep 1324headerdep: 1325 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1326 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1327 1328# --------------------------------------------------------------------------- 1329# Kernel headers 1330 1331#Default location for installed headers 1332export INSTALL_HDR_PATH = $(objtree)/usr 1333 1334quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1335 cmd_headers_install = \ 1336 mkdir -p $(INSTALL_HDR_PATH); \ 1337 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1338 usr/include $(INSTALL_HDR_PATH) 1339 1340PHONY += headers_install 1341headers_install: headers 1342 $(call cmd,headers_install) 1343 1344PHONY += archheaders archscripts 1345 1346hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1347 1348PHONY += headers 1349headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1350 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1351 $(error Headers not exportable for the $(SRCARCH) architecture)) 1352 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1353 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1354 1355# Deprecated. It is no-op now. 1356PHONY += headers_check 1357headers_check: 1358 @: 1359 1360ifdef CONFIG_HEADERS_INSTALL 1361prepare: headers 1362endif 1363 1364PHONY += scripts_unifdef 1365scripts_unifdef: scripts_basic 1366 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1367 1368# --------------------------------------------------------------------------- 1369# Kernel selftest 1370 1371PHONY += kselftest 1372kselftest: 1373 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1374 1375kselftest-%: FORCE 1376 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1377 1378PHONY += kselftest-merge 1379kselftest-merge: 1380 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1381 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1382 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1383 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1384 1385# --------------------------------------------------------------------------- 1386# Devicetree files 1387 1388ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1389dtstree := arch/$(SRCARCH)/boot/dts 1390endif 1391 1392ifneq ($(dtstree),) 1393 1394%.dtb: include/config/kernel.release scripts_dtc 1395 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1396 1397PHONY += dtbs dtbs_install dtbs_check 1398dtbs: include/config/kernel.release scripts_dtc 1399 $(Q)$(MAKE) $(build)=$(dtstree) 1400 1401ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1402export CHECK_DTBS=y 1403dtbs: dt_binding_check 1404endif 1405 1406dtbs_check: dtbs 1407 1408dtbs_install: 1409 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1410 1411ifdef CONFIG_OF_EARLY_FLATTREE 1412all: dtbs 1413endif 1414 1415endif 1416 1417PHONY += scripts_dtc 1418scripts_dtc: scripts_basic 1419 $(Q)$(MAKE) $(build)=scripts/dtc 1420 1421ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1422export CHECK_DT_BINDING=y 1423endif 1424 1425PHONY += dt_binding_check 1426dt_binding_check: scripts_dtc 1427 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1428 1429# --------------------------------------------------------------------------- 1430# Modules 1431 1432ifdef CONFIG_MODULES 1433 1434# By default, build modules as well 1435 1436all: modules 1437 1438# When we're building modules with modversions, we need to consider 1439# the built-in objects during the descend as well, in order to 1440# make sure the checksums are up to date before we record them. 1441ifdef CONFIG_MODVERSIONS 1442 KBUILD_BUILTIN := 1 1443endif 1444 1445# Build modules 1446# 1447# A module can be listed more than once in obj-m resulting in 1448# duplicate lines in modules.order files. Those are removed 1449# using awk while concatenating to the final file. 1450 1451PHONY += modules 1452modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1453 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1454 1455PHONY += modules_check 1456modules_check: modules.order 1457 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1458 1459cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1460 1461modules.order: $(subdir-modorder) FORCE 1462 $(call if_changed,modules_order) 1463 1464targets += modules.order 1465 1466# Target to prepare building external modules 1467PHONY += modules_prepare 1468modules_prepare: prepare 1469 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1470 1471# Target to install modules 1472PHONY += modules_install 1473modules_install: _modinst_ _modinst_post 1474 1475PHONY += _modinst_ 1476_modinst_: 1477 @rm -rf $(MODLIB)/kernel 1478 @rm -f $(MODLIB)/source 1479 @mkdir -p $(MODLIB)/kernel 1480 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1481 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1482 rm -f $(MODLIB)/build ; \ 1483 ln -s $(CURDIR) $(MODLIB)/build ; \ 1484 fi 1485 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1486 @cp -f modules.builtin $(MODLIB)/ 1487 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1488 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1489 1490# This depmod is only for convenience to give the initial 1491# boot a modules.dep even before / is mounted read-write. However the 1492# boot script depmod is the master version. 1493PHONY += _modinst_post 1494_modinst_post: _modinst_ 1495 $(call cmd,depmod) 1496 1497ifeq ($(CONFIG_MODULE_SIG), y) 1498PHONY += modules_sign 1499modules_sign: 1500 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1501endif 1502 1503else # CONFIG_MODULES 1504 1505# Modules not configured 1506# --------------------------------------------------------------------------- 1507 1508PHONY += modules modules_install 1509modules modules_install: 1510 @echo >&2 1511 @echo >&2 "The present kernel configuration has modules disabled." 1512 @echo >&2 "Type 'make config' and enable loadable module support." 1513 @echo >&2 "Then build a kernel with module support enabled." 1514 @echo >&2 1515 @exit 1 1516 1517endif # CONFIG_MODULES 1518 1519### 1520# Cleaning is done on three levels. 1521# make clean Delete most generated files 1522# Leave enough to build external modules 1523# make mrproper Delete the current configuration, and all generated files 1524# make distclean Remove editor backup files, patch leftover files and the like 1525 1526# Directories & files removed with 'make clean' 1527CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1528 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1529 compile_commands.json .thinlto-cache 1530 1531# Directories & files removed with 'make mrproper' 1532MRPROPER_FILES += include/config include/generated \ 1533 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1534 debian snap tar-install \ 1535 .config .config.old .version \ 1536 Module.symvers \ 1537 signing_key.pem signing_key.priv signing_key.x509 \ 1538 x509.genkey extra_certificates signing_key.x509.keyid \ 1539 signing_key.x509.signer vmlinux-gdb.py \ 1540 *.spec 1541 1542# Directories & files removed with 'make distclean' 1543DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1544 1545# clean - Delete most, but leave enough to build external modules 1546# 1547clean: rm-files := $(CLEAN_FILES) 1548 1549PHONY += archclean vmlinuxclean 1550 1551vmlinuxclean: 1552 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1553 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1554 1555clean: archclean vmlinuxclean resolve_btfids_clean 1556 1557# mrproper - Delete all generated files, including .config 1558# 1559mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1560mrproper-dirs := $(addprefix _mrproper_,scripts) 1561 1562PHONY += $(mrproper-dirs) mrproper 1563$(mrproper-dirs): 1564 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1565 1566mrproper: clean $(mrproper-dirs) 1567 $(call cmd,rmfiles) 1568 1569# distclean 1570# 1571distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1572 1573PHONY += distclean 1574 1575distclean: mrproper 1576 $(call cmd,rmfiles) 1577 @find $(srctree) $(RCS_FIND_IGNORE) \ 1578 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1579 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1580 -o -name 'core' \) \ 1581 -type f -print | xargs rm -f 1582 1583 1584# Packaging of the kernel to various formats 1585# --------------------------------------------------------------------------- 1586 1587%src-pkg: FORCE 1588 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1589%pkg: include/config/kernel.release FORCE 1590 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1591 1592# Brief documentation of the typical targets used 1593# --------------------------------------------------------------------------- 1594 1595boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1596boards := $(sort $(notdir $(boards))) 1597board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1598board-dirs := $(sort $(notdir $(board-dirs:/=))) 1599 1600PHONY += help 1601help: 1602 @echo 'Cleaning targets:' 1603 @echo ' clean - Remove most generated files but keep the config and' 1604 @echo ' enough build support to build external modules' 1605 @echo ' mrproper - Remove all generated files + config + various backup files' 1606 @echo ' distclean - mrproper + remove editor backup and patch files' 1607 @echo '' 1608 @echo 'Configuration targets:' 1609 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1610 @echo '' 1611 @echo 'Other generic targets:' 1612 @echo ' all - Build all targets marked with [*]' 1613 @echo '* vmlinux - Build the bare kernel' 1614 @echo '* modules - Build all modules' 1615 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1616 @echo ' dir/ - Build all files in dir and below' 1617 @echo ' dir/file.[ois] - Build specified target only' 1618 @echo ' dir/file.ll - Build the LLVM assembly file' 1619 @echo ' (requires compiler support for LLVM assembly generation)' 1620 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1621 @echo ' (requires a recent binutils and recent build (System.map))' 1622 @echo ' dir/file.ko - Build module including final link' 1623 @echo ' modules_prepare - Set up for building external modules' 1624 @echo ' tags/TAGS - Generate tags file for editors' 1625 @echo ' cscope - Generate cscope index' 1626 @echo ' gtags - Generate GNU GLOBAL index' 1627 @echo ' kernelrelease - Output the release version string (use with make -s)' 1628 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1629 @echo ' image_name - Output the image name (use with make -s)' 1630 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1631 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1632 echo '' 1633 @echo 'Static analysers:' 1634 @echo ' checkstack - Generate a list of stack hogs' 1635 @echo ' versioncheck - Sanity check on version.h usage' 1636 @echo ' includecheck - Check for duplicate included header files' 1637 @echo ' export_report - List the usages of all exported symbols' 1638 @echo ' headerdep - Detect inclusion cycles in headers' 1639 @echo ' coccicheck - Check with Coccinelle' 1640 @echo ' clang-analyzer - Check with clang static analyzer' 1641 @echo ' clang-tidy - Check with clang-tidy' 1642 @echo '' 1643 @echo 'Tools:' 1644 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1645 @echo '' 1646 @echo 'Kernel selftest:' 1647 @echo ' kselftest - Build and run kernel selftest' 1648 @echo ' Build, install, and boot kernel before' 1649 @echo ' running kselftest on it' 1650 @echo ' Run as root for full coverage' 1651 @echo ' kselftest-all - Build kernel selftest' 1652 @echo ' kselftest-install - Build and install kernel selftest' 1653 @echo ' kselftest-clean - Remove all generated kselftest files' 1654 @echo ' kselftest-merge - Merge all the config dependencies of' 1655 @echo ' kselftest to existing .config.' 1656 @echo '' 1657 @$(if $(dtstree), \ 1658 echo 'Devicetree:'; \ 1659 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1660 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1661 echo ' dt_binding_check - Validate device tree binding documents'; \ 1662 echo ' dtbs_check - Validate device tree source files';\ 1663 echo '') 1664 1665 @echo 'Userspace tools targets:' 1666 @echo ' use "make tools/help"' 1667 @echo ' or "cd tools; make help"' 1668 @echo '' 1669 @echo 'Kernel packaging:' 1670 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1671 @echo '' 1672 @echo 'Documentation targets:' 1673 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1674 @echo '' 1675 @echo 'Architecture specific targets ($(SRCARCH)):' 1676 @$(if $(archhelp),$(archhelp),\ 1677 echo ' No architecture specific help defined for $(SRCARCH)') 1678 @echo '' 1679 @$(if $(boards), \ 1680 $(foreach b, $(boards), \ 1681 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1682 echo '') 1683 @$(if $(board-dirs), \ 1684 $(foreach b, $(board-dirs), \ 1685 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1686 printf " %-16s - Show all of the above\\n" help-boards; \ 1687 echo '') 1688 1689 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1690 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1691 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1692 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1693 @echo ' (sparse by default)' 1694 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1695 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1696 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1697 @echo ' 1: warnings which may be relevant and do not occur too often' 1698 @echo ' 2: warnings which occur quite often but may still be relevant' 1699 @echo ' 3: more obscure warnings, can most likely be ignored' 1700 @echo ' Multiple levels can be combined with W=12 or W=123' 1701 @echo '' 1702 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1703 @echo 'For further info see the ./README file' 1704 1705 1706help-board-dirs := $(addprefix help-,$(board-dirs)) 1707 1708help-boards: $(help-board-dirs) 1709 1710boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1711 1712$(help-board-dirs): help-%: 1713 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1714 @$(if $(boards-per-dir), \ 1715 $(foreach b, $(boards-per-dir), \ 1716 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1717 echo '') 1718 1719 1720# Documentation targets 1721# --------------------------------------------------------------------------- 1722DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1723 linkcheckdocs dochelp refcheckdocs 1724PHONY += $(DOC_TARGETS) 1725$(DOC_TARGETS): 1726 $(Q)$(MAKE) $(build)=Documentation $@ 1727 1728# Misc 1729# --------------------------------------------------------------------------- 1730 1731PHONY += scripts_gdb 1732scripts_gdb: prepare0 1733 $(Q)$(MAKE) $(build)=scripts/gdb 1734 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1735 1736ifdef CONFIG_GDB_SCRIPTS 1737all: scripts_gdb 1738endif 1739 1740else # KBUILD_EXTMOD 1741 1742### 1743# External module support. 1744# When building external modules the kernel used as basis is considered 1745# read-only, and no consistency checks are made and the make 1746# system is not used on the basis kernel. If updates are required 1747# in the basis kernel ordinary make commands (without M=...) must 1748# be used. 1749# 1750# The following are the only valid targets when building external 1751# modules. 1752# make M=dir clean Delete all automatically generated files 1753# make M=dir modules Make all modules in specified dir 1754# make M=dir Same as 'make M=dir modules' 1755# make M=dir modules_install 1756# Install the modules built in the module directory 1757# Assumes install directory is already created 1758 1759# We are always building only modules. 1760KBUILD_BUILTIN := 1761KBUILD_MODULES := 1 1762 1763build-dirs := $(KBUILD_EXTMOD) 1764PHONY += modules 1765modules: $(MODORDER) 1766 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1767 1768$(MODORDER): descend 1769 @: 1770 1771PHONY += modules_install 1772modules_install: _emodinst_ _emodinst_post 1773 1774install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1775PHONY += _emodinst_ 1776_emodinst_: 1777 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1778 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1779 1780PHONY += _emodinst_post 1781_emodinst_post: _emodinst_ 1782 $(call cmd,depmod) 1783 1784compile_commands.json: $(extmod-prefix)compile_commands.json 1785PHONY += compile_commands.json 1786 1787clean-dirs := $(KBUILD_EXTMOD) 1788clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1789 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1790 1791PHONY += help 1792help: 1793 @echo ' Building external modules.' 1794 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1795 @echo '' 1796 @echo ' modules - default target, build the module(s)' 1797 @echo ' modules_install - install the module' 1798 @echo ' clean - remove generated files in module directory only' 1799 @echo '' 1800 1801# no-op for external module builds 1802PHONY += prepare modules_prepare 1803 1804endif # KBUILD_EXTMOD 1805 1806# Single targets 1807# --------------------------------------------------------------------------- 1808# To build individual files in subdirectories, you can do like this: 1809# 1810# make foo/bar/baz.s 1811# 1812# The supported suffixes for single-target are listed in 'single-targets' 1813# 1814# To build only under specific subdirectories, you can do like this: 1815# 1816# make foo/bar/baz/ 1817 1818ifdef single-build 1819 1820# .ko is special because modpost is needed 1821single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1822single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1823 1824$(single-ko): single_modpost 1825 @: 1826$(single-no-ko): descend 1827 @: 1828 1829ifeq ($(KBUILD_EXTMOD),) 1830# For the single build of in-tree modules, use a temporary file to avoid 1831# the situation of modules_install installing an invalid modules.order. 1832MODORDER := .modules.tmp 1833endif 1834 1835PHONY += single_modpost 1836single_modpost: $(single-no-ko) modules_prepare 1837 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1838 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1839 1840KBUILD_MODULES := 1 1841 1842export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1843 1844# trim unrelated directories 1845build-dirs := $(foreach d, $(build-dirs), \ 1846 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1847 1848endif 1849 1850ifndef CONFIG_MODULES 1851KBUILD_MODULES := 1852endif 1853 1854# Handle descending into subdirectories listed in $(build-dirs) 1855# Preset locale variables to speed up the build process. Limit locale 1856# tweaks to this spot to avoid wrong language settings when running 1857# make menuconfig etc. 1858# Error messages still appears in the original language 1859PHONY += descend $(build-dirs) 1860descend: $(build-dirs) 1861$(build-dirs): prepare 1862 $(Q)$(MAKE) $(build)=$@ \ 1863 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1864 need-builtin=1 need-modorder=1 1865 1866clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1867PHONY += $(clean-dirs) clean 1868$(clean-dirs): 1869 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1870 1871clean: $(clean-dirs) 1872 $(call cmd,rmfiles) 1873 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1874 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1875 -o -name '*.ko.*' \ 1876 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1877 -o -name '*.dwo' -o -name '*.lst' \ 1878 -o -name '*.su' -o -name '*.mod' \ 1879 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1880 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1881 -o -name '*.asn1.[ch]' \ 1882 -o -name '*.symtypes' -o -name 'modules.order' \ 1883 -o -name '.tmp_*.o.*' \ 1884 -o -name '*.c.[012]*.*' \ 1885 -o -name '*.ll' \ 1886 -o -name '*.gcno' \ 1887 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1888 1889# Generate tags for editors 1890# --------------------------------------------------------------------------- 1891quiet_cmd_tags = GEN $@ 1892 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1893 1894tags TAGS cscope gtags: FORCE 1895 $(call cmd,tags) 1896 1897# Script to generate missing namespace dependencies 1898# --------------------------------------------------------------------------- 1899 1900PHONY += nsdeps 1901nsdeps: export KBUILD_NSDEPS=1 1902nsdeps: modules 1903 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1904 1905# Clang Tooling 1906# --------------------------------------------------------------------------- 1907 1908quiet_cmd_gen_compile_commands = GEN $@ 1909 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1910 1911$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1912 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1913 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1914 $(call if_changed,gen_compile_commands) 1915 1916targets += $(extmod-prefix)compile_commands.json 1917 1918PHONY += clang-tidy clang-analyzer 1919 1920ifdef CONFIG_CC_IS_CLANG 1921quiet_cmd_clang_tools = CHECK $< 1922 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1923 1924clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1925 $(call cmd,clang_tools) 1926else 1927clang-tidy clang-analyzer: 1928 @echo "$@ requires CC=clang" >&2 1929 @false 1930endif 1931 1932# Scripts to check various things for consistency 1933# --------------------------------------------------------------------------- 1934 1935PHONY += includecheck versioncheck coccicheck export_report 1936 1937includecheck: 1938 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1939 -name '*.[hcS]' -type f -print | sort \ 1940 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1941 1942versioncheck: 1943 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1944 -name '*.[hcS]' -type f -print | sort \ 1945 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1946 1947coccicheck: 1948 $(Q)$(BASH) $(srctree)/scripts/$@ 1949 1950export_report: 1951 $(PERL) $(srctree)/scripts/export_report.pl 1952 1953PHONY += checkstack kernelrelease kernelversion image_name 1954 1955# UML needs a little special treatment here. It wants to use the host 1956# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1957# else wants $(ARCH), including people doing cross-builds, which means 1958# that $(SUBARCH) doesn't work here. 1959ifeq ($(ARCH), um) 1960CHECKSTACK_ARCH := $(SUBARCH) 1961else 1962CHECKSTACK_ARCH := $(ARCH) 1963endif 1964checkstack: 1965 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1966 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1967 1968kernelrelease: 1969 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1970 1971kernelversion: 1972 @echo $(KERNELVERSION) 1973 1974image_name: 1975 @echo $(KBUILD_IMAGE) 1976 1977# Clear a bunch of variables before executing the submake 1978 1979ifeq ($(quiet),silent_) 1980tools_silent=s 1981endif 1982 1983tools/: FORCE 1984 $(Q)mkdir -p $(objtree)/tools 1985 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1986 1987tools/%: FORCE 1988 $(Q)mkdir -p $(objtree)/tools 1989 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1990 1991quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1992 cmd_rmfiles = rm -rf $(rm-files) 1993 1994# Run depmod only if we have System.map and depmod is executable 1995quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1996 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1997 $(KERNELRELEASE) 1998 1999# read saved command lines for existing targets 2000existing-targets := $(wildcard $(sort $(targets))) 2001 2002-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2003 2004endif # config-build 2005endif # mixed-build 2006endif # need-sub-make 2007 2008PHONY += FORCE 2009FORCE: 2010 2011# Declare the contents of the PHONY variable as phony. We keep that 2012# information in a variable so we can use it in if_changed and friends. 2013.PHONY: $(PHONY) 2014