1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 13 4SUBLEVEL = 16 5EXTRAVERSION = 6NAME = Opossums on Parade 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132# Remove trailing slashes 133ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135endif 136 137export KBUILD_EXTMOD 138 139# Kbuild will save output files in the current working directory. 140# This does not need to match to the root of the kernel source tree. 141# 142# For example, you can do this: 143# 144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145# 146# If you want to save output files in a different location, there are 147# two syntaxes to specify it. 148# 149# 1) O= 150# Use "make O=dir/to/store/output/files/" 151# 152# 2) Set KBUILD_OUTPUT 153# Set the environment variable KBUILD_OUTPUT to point to the output directory. 154# export KBUILD_OUTPUT=dir/to/store/output/files/; make 155# 156# The O= assignment takes precedence over the KBUILD_OUTPUT environment 157# variable. 158 159# Do we want to change the working directory? 160ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162endif 163 164ifneq ($(KBUILD_OUTPUT),) 165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166# expand a shell special character '~'. We use a somewhat tedious way here. 167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168$(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171# $(realpath ...) resolves symlinks 172abs_objtree := $(realpath $(abs_objtree)) 173else 174abs_objtree := $(CURDIR) 175endif # ifneq ($(KBUILD_OUTPUT),) 176 177ifeq ($(abs_objtree),$(CURDIR)) 178# Suppress "Entering directory ..." unless we are changing the work directory. 179MAKEFLAGS += --no-print-directory 180else 181need-sub-make := 1 182endif 183 184this-makefile := $(lastword $(MAKEFILE_LIST)) 185abs_srctree := $(realpath $(dir $(this-makefile))) 186 187ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188$(error source directory cannot contain spaces or colons) 189endif 190 191ifneq ($(abs_srctree),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# This does not become effective immediately because MAKEFLAGS is re-parsed 195# once after the Makefile is read. We need to invoke sub-make. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197need-sub-make := 1 198endif 199 200ifneq ($(filter 3.%,$(MAKE_VERSION)),) 201# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 202# We need to invoke sub-make to avoid implicit rules in the top Makefile. 203need-sub-make := 1 204# Cancel implicit rules for this Makefile. 205$(this-makefile): ; 206endif 207 208export abs_srctree abs_objtree 209export sub_make_done := 1 210 211ifeq ($(need-sub-make),1) 212 213PHONY += $(MAKECMDGOALS) __sub-make 214 215$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 216 @: 217 218# Invoke a second make in the output directory, passing relevant variables 219__sub-make: 220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 221 222endif # need-sub-make 223endif # sub_make_done 224 225# We process the rest of the Makefile if this is the final invocation of make 226ifeq ($(need-sub-make),) 227 228# Do not print "Entering directory ...", 229# but we want to display it when entering to the output directory 230# so that IDEs/editors are able to understand relative filenames. 231MAKEFLAGS += --no-print-directory 232 233ifeq ($(abs_srctree),$(abs_objtree)) 234 # building in the source tree 235 srctree := . 236 building_out_of_srctree := 237else 238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 239 # building in a subdirectory of the source tree 240 srctree := .. 241 else 242 srctree := $(abs_srctree) 243 endif 244 building_out_of_srctree := 1 245endif 246 247ifneq ($(KBUILD_ABS_SRCTREE),) 248srctree := $(abs_srctree) 249endif 250 251objtree := . 252VPATH := $(srctree) 253 254export building_out_of_srctree srctree objtree VPATH 255 256# To make sure we do not include .config for any of the *config targets 257# catch them early, and hand them over to scripts/kconfig/Makefile 258# It is allowed to specify more targets when calling make, including 259# mixing *config targets and build targets. 260# For example 'make oldconfig all'. 261# Detect when mixed targets is specified, and make a second invocation 262# of make so .config is not included in this case either (for *config). 263 264version_h := include/generated/uapi/linux/version.h 265 266clean-targets := %clean mrproper cleandocs 267no-dot-config-targets := $(clean-targets) \ 268 cscope gtags TAGS tags help% %docs check% coccicheck \ 269 $(version_h) headers headers_% archheaders archscripts \ 270 %asm-generic kernelversion %src-pkg dt_binding_check \ 271 outputmakefile 272# Installation targets should not require compiler. Unfortunately, vdso_install 273# is an exception where build artifacts may be updated. This must be fixed. 274no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 275 headers_install modules_install kernelrelease image_name 276no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 277 image_name 278single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 279 280config-build := 281mixed-build := 282need-config := 1 283need-compiler := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 295 need-compiler := 296 endif 297endif 298 299ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 301 may-sync-config := 302 endif 303endif 304 305ifneq ($(KBUILD_EXTMOD),) 306 may-sync-config := 307endif 308 309ifeq ($(KBUILD_EXTMOD),) 310 ifneq ($(filter %config,$(MAKECMDGOALS)),) 311 config-build := 1 312 ifneq ($(words $(MAKECMDGOALS)),1) 313 mixed-build := 1 314 endif 315 endif 316endif 317 318# We cannot build single targets and the others at the same time 319ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 320 single-build := 1 321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 322 mixed-build := 1 323 endif 324endif 325 326# For "make -j clean all", "make -j mrproper defconfig all", etc. 327ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 329 mixed-build := 1 330 endif 331endif 332 333# install and modules_install need also be processed one by one 334ifneq ($(filter install,$(MAKECMDGOALS)),) 335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 336 mixed-build := 1 337 endif 338endif 339 340ifdef mixed-build 341# =========================================================================== 342# We're called with mixed targets (*config and build targets). 343# Handle them one by one. 344 345PHONY += $(MAKECMDGOALS) __build_one_by_one 346 347$(MAKECMDGOALS): __build_one_by_one 348 @: 349 350__build_one_by_one: 351 $(Q)set -e; \ 352 for i in $(MAKECMDGOALS); do \ 353 $(MAKE) -f $(srctree)/Makefile $$i; \ 354 done 355 356else # !mixed-build 357 358include $(srctree)/scripts/Kbuild.include 359 360# Read KERNELRELEASE from include/config/kernel.release (if it exists) 361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 362KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 364 365include $(srctree)/scripts/subarch.include 366 367# Cross compiling and selecting different set of gcc/bin-utils 368# --------------------------------------------------------------------------- 369# 370# When performing cross compilation for other architectures ARCH shall be set 371# to the target architecture. (See arch/* for the possibilities). 372# ARCH can be set during invocation of make: 373# make ARCH=ia64 374# Another way is to have ARCH set in the environment. 375# The default ARCH is the host where make is executed. 376 377# CROSS_COMPILE specify the prefix used for all executables used 378# during compilation. Only gcc and related bin-utils executables 379# are prefixed with $(CROSS_COMPILE). 380# CROSS_COMPILE can be set on the command line 381# make CROSS_COMPILE=ia64-linux- 382# Alternatively CROSS_COMPILE can be set in the environment. 383# Default value for CROSS_COMPILE is not to prefix executables 384# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 385ARCH ?= $(SUBARCH) 386 387# Architecture as present in compile.h 388UTS_MACHINE := $(ARCH) 389SRCARCH := $(ARCH) 390 391# Additional ARCH settings for x86 392ifeq ($(ARCH),i386) 393 SRCARCH := x86 394endif 395ifeq ($(ARCH),x86_64) 396 SRCARCH := x86 397endif 398 399# Additional ARCH settings for sparc 400ifeq ($(ARCH),sparc32) 401 SRCARCH := sparc 402endif 403ifeq ($(ARCH),sparc64) 404 SRCARCH := sparc 405endif 406 407export cross_compiling := 408ifneq ($(SRCARCH),$(SUBARCH)) 409cross_compiling := 1 410endif 411 412KCONFIG_CONFIG ?= .config 413export KCONFIG_CONFIG 414 415# SHELL used by kbuild 416CONFIG_SHELL := sh 417 418HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 419HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 420HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 421 422ifneq ($(LLVM),) 423HOSTCC = clang 424HOSTCXX = clang++ 425else 426HOSTCC = gcc 427HOSTCXX = g++ 428endif 429 430export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 431 -O2 -fomit-frame-pointer -std=gnu89 432export KBUILD_USERLDFLAGS := 433 434KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 435KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 436KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 437KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 438 439# Make variables (CC, etc...) 440CPP = $(CC) -E 441ifneq ($(LLVM),) 442CC = clang 443LD = ld.lld 444AR = llvm-ar 445NM = llvm-nm 446OBJCOPY = llvm-objcopy 447OBJDUMP = llvm-objdump 448READELF = llvm-readelf 449STRIP = llvm-strip 450else 451CC = $(CROSS_COMPILE)gcc 452LD = $(CROSS_COMPILE)ld 453AR = $(CROSS_COMPILE)ar 454NM = $(CROSS_COMPILE)nm 455OBJCOPY = $(CROSS_COMPILE)objcopy 456OBJDUMP = $(CROSS_COMPILE)objdump 457READELF = $(CROSS_COMPILE)readelf 458STRIP = $(CROSS_COMPILE)strip 459endif 460PAHOLE = pahole 461RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 462LEX = flex 463YACC = bison 464AWK = awk 465INSTALLKERNEL := installkernel 466DEPMOD = depmod 467PERL = perl 468PYTHON3 = python3 469CHECK = sparse 470BASH = bash 471KGZIP = gzip 472KBZIP2 = bzip2 473KLZOP = lzop 474LZMA = lzma 475LZ4 = lz4c 476XZ = xz 477ZSTD = zstd 478 479CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 480 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 481NOSTDINC_FLAGS := 482CFLAGS_MODULE = 483AFLAGS_MODULE = 484LDFLAGS_MODULE = 485CFLAGS_KERNEL = 486AFLAGS_KERNEL = 487LDFLAGS_vmlinux = 488 489# Use USERINCLUDE when you must reference the UAPI directories only. 490USERINCLUDE := \ 491 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 492 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 493 -I$(srctree)/include/uapi \ 494 -I$(objtree)/include/generated/uapi \ 495 -include $(srctree)/include/linux/compiler-version.h \ 496 -include $(srctree)/include/linux/kconfig.h 497 498# Use LINUXINCLUDE when you must reference the include/ directory. 499# Needed to be compatible with the O= option 500LINUXINCLUDE := \ 501 -I$(srctree)/arch/$(SRCARCH)/include \ 502 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 503 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 504 -I$(objtree)/include \ 505 $(USERINCLUDE) 506 507KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 508KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 509 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 510 -Werror=implicit-function-declaration -Werror=implicit-int \ 511 -Werror=return-type -Wno-format-security \ 512 -std=gnu89 513KBUILD_CPPFLAGS := -D__KERNEL__ 514KBUILD_AFLAGS_KERNEL := 515KBUILD_CFLAGS_KERNEL := 516KBUILD_AFLAGS_MODULE := -DMODULE 517KBUILD_CFLAGS_MODULE := -DMODULE 518KBUILD_LDFLAGS_MODULE := 519KBUILD_LDFLAGS := 520CLANG_FLAGS := 521 522export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 523export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 524export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 525export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 526export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 527 528export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 529export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 530export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 531export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 532export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 533 534# Files to ignore in find ... statements 535 536export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 537 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 538 -prune -o 539export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 540 --exclude CVS --exclude .pc --exclude .hg --exclude .git 541 542# =========================================================================== 543# Rules shared between *config targets and build targets 544 545# Basic helpers built in scripts/basic/ 546PHONY += scripts_basic 547scripts_basic: 548 $(Q)$(MAKE) $(build)=scripts/basic 549 $(Q)rm -f .tmp_quiet_recordmcount 550 551PHONY += outputmakefile 552# Before starting out-of-tree build, make sure the source tree is clean. 553# outputmakefile generates a Makefile in the output directory, if using a 554# separate output directory. This allows convenient use of make in the 555# output directory. 556# At the same time when output Makefile generated, generate .gitignore to 557# ignore whole output directory 558outputmakefile: 559ifdef building_out_of_srctree 560 $(Q)if [ -f $(srctree)/.config -o \ 561 -d $(srctree)/include/config -o \ 562 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 563 echo >&2 "***"; \ 564 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 565 echo >&2 "*** in $(abs_srctree)";\ 566 echo >&2 "***"; \ 567 false; \ 568 fi 569 $(Q)ln -fsn $(srctree) source 570 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 571 $(Q)test -e .gitignore || \ 572 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 573endif 574 575# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 576# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 577# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 578# and from include/config/auto.conf.cmd to detect the compiler upgrade. 579CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 580 581ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 582ifneq ($(CROSS_COMPILE),) 583CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 584endif 585ifeq ($(LLVM_IAS),1) 586CLANG_FLAGS += -integrated-as 587else 588CLANG_FLAGS += -no-integrated-as 589GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 590CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 591endif 592CLANG_FLAGS += -Werror=unknown-warning-option 593KBUILD_CFLAGS += $(CLANG_FLAGS) 594KBUILD_AFLAGS += $(CLANG_FLAGS) 595export CLANG_FLAGS 596endif 597 598# Include this also for config targets because some architectures need 599# cc-cross-prefix to determine CROSS_COMPILE. 600ifdef need-compiler 601include $(srctree)/scripts/Makefile.compiler 602endif 603 604ifdef config-build 605# =========================================================================== 606# *config targets only - make sure prerequisites are updated, and descend 607# in scripts/kconfig to make the *config target 608 609# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 610# KBUILD_DEFCONFIG may point out an alternative default configuration 611# used for 'make defconfig' 612include $(srctree)/arch/$(SRCARCH)/Makefile 613export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 614 615config: outputmakefile scripts_basic FORCE 616 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 617 618%config: outputmakefile scripts_basic FORCE 619 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 620 621else #!config-build 622# =========================================================================== 623# Build targets only - this includes vmlinux, arch specific targets, clean 624# targets and others. In general all targets except *config targets. 625 626# If building an external module we do not care about the all: rule 627# but instead __all depend on modules 628PHONY += all 629ifeq ($(KBUILD_EXTMOD),) 630__all: all 631else 632__all: modules 633endif 634 635# Decide whether to build built-in, modular, or both. 636# Normally, just do built-in. 637 638KBUILD_MODULES := 639KBUILD_BUILTIN := 1 640 641# If we have only "make modules", don't compile built-in objects. 642ifeq ($(MAKECMDGOALS),modules) 643 KBUILD_BUILTIN := 644endif 645 646# If we have "make <whatever> modules", compile modules 647# in addition to whatever we do anyway. 648# Just "make" or "make all" shall build modules as well 649 650ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 651 KBUILD_MODULES := 1 652endif 653 654ifeq ($(MAKECMDGOALS),) 655 KBUILD_MODULES := 1 656endif 657 658export KBUILD_MODULES KBUILD_BUILTIN 659 660ifdef need-config 661include include/config/auto.conf 662endif 663 664ifeq ($(KBUILD_EXTMOD),) 665# Objects we will link into vmlinux / subdirs we need to visit 666core-y := init/ usr/ 667drivers-y := drivers/ sound/ 668drivers-$(CONFIG_SAMPLES) += samples/ 669drivers-$(CONFIG_NET) += net/ 670drivers-y += virt/ 671libs-y := lib/ 672endif # KBUILD_EXTMOD 673 674# The all: target is the default when no target is given on the 675# command line. 676# This allow a user to issue only 'make' to build a kernel including modules 677# Defaults to vmlinux, but the arch makefile usually adds further targets 678all: vmlinux 679 680CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 681 $(call cc-option,-fno-tree-loop-im) \ 682 $(call cc-disable-warning,maybe-uninitialized,) 683export CFLAGS_GCOV 684 685# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 686ifdef CONFIG_FUNCTION_TRACER 687 CC_FLAGS_FTRACE := -pg 688endif 689 690RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 691RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 692RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 693RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 694RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 695RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 696export RETPOLINE_CFLAGS 697export RETPOLINE_VDSO_CFLAGS 698 699include $(srctree)/arch/$(SRCARCH)/Makefile 700 701ifdef need-config 702ifdef may-sync-config 703# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 704# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 705# because some architectures define CROSS_COMPILE there. 706include include/config/auto.conf.cmd 707 708$(KCONFIG_CONFIG): 709 @echo >&2 '***' 710 @echo >&2 '*** Configuration file "$@" not found!' 711 @echo >&2 '***' 712 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 713 @echo >&2 '*** "make menuconfig" or "make xconfig").' 714 @echo >&2 '***' 715 @/bin/false 716 717# The actual configuration files used during the build are stored in 718# include/generated/ and include/config/. Update them if .config is newer than 719# include/config/auto.conf (which mirrors .config). 720# 721# This exploits the 'multi-target pattern rule' trick. 722# The syncconfig should be executed only once to make all the targets. 723# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 724# 725# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 726# so you cannot notice that Kconfig is waiting for the user input. 727%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 728 $(Q)$(kecho) " SYNC $@" 729 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 730else # !may-sync-config 731# External modules and some install targets need include/generated/autoconf.h 732# and include/config/auto.conf but do not care if they are up-to-date. 733# Use auto.conf to trigger the test 734PHONY += include/config/auto.conf 735 736include/config/auto.conf: 737 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 738 echo >&2; \ 739 echo >&2 " ERROR: Kernel configuration is invalid."; \ 740 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 741 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 742 echo >&2 ; \ 743 /bin/false) 744 745endif # may-sync-config 746endif # need-config 747 748KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 749KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 750KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 751KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 752KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 753 754ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 755KBUILD_CFLAGS += -O2 756else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 757KBUILD_CFLAGS += -O3 758else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 759KBUILD_CFLAGS += -Os 760endif 761 762# Tell gcc to never replace conditional load with a non-conditional one 763KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 764KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 765 766ifdef CONFIG_READABLE_ASM 767# Disable optimizations that make assembler listings hard to read. 768# reorder blocks reorders the control in the function 769# ipa clone creates specialized cloned functions 770# partial inlining inlines only parts of functions 771KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 772 $(call cc-option,-fno-ipa-cp-clone,) \ 773 $(call cc-option,-fno-partial-inlining) 774endif 775 776ifneq ($(CONFIG_FRAME_WARN),0) 777KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 778endif 779 780stackp-flags-y := -fno-stack-protector 781stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 782stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 783 784KBUILD_CFLAGS += $(stackp-flags-y) 785 786ifdef CONFIG_CC_IS_CLANG 787KBUILD_CPPFLAGS += -Qunused-arguments 788KBUILD_CFLAGS += -Wno-format-invalid-specifier 789KBUILD_CFLAGS += -Wno-gnu 790# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 791# source of a reference will be _MergedGlobals and not on of the whitelisted names. 792# See modpost pattern 2 793KBUILD_CFLAGS += -mno-global-merge 794else 795 796# Warn about unmarked fall-throughs in switch statement. 797# Disabled for clang while comment to attribute conversion happens and 798# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 799KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 800endif 801 802# These warnings generated too much noise in a regular build. 803# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 804KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 805 806KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 807ifdef CONFIG_FRAME_POINTER 808KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 809else 810# Some targets (ARM with Thumb2, for example), can't be built with frame 811# pointers. For those, we don't have FUNCTION_TRACER automatically 812# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 813# incompatible with -fomit-frame-pointer with current GCC, so we don't use 814# -fomit-frame-pointer with FUNCTION_TRACER. 815ifndef CONFIG_FUNCTION_TRACER 816KBUILD_CFLAGS += -fomit-frame-pointer 817endif 818endif 819 820# Initialize all stack variables with a 0xAA pattern. 821ifdef CONFIG_INIT_STACK_ALL_PATTERN 822KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 823endif 824 825# Initialize all stack variables with a zero value. 826ifdef CONFIG_INIT_STACK_ALL_ZERO 827# Future support for zero initialization is still being debated, see 828# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 829# renamed or dropped. 830KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 831KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 832endif 833 834# While VLAs have been removed, GCC produces unreachable stack probes 835# for the randomize_kstack_offset feature. Disable it for all compilers. 836KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 837 838DEBUG_CFLAGS := 839 840# Workaround for GCC versions < 5.0 841# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 842ifdef CONFIG_CC_IS_GCC 843DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 844endif 845 846ifdef CONFIG_DEBUG_INFO 847 848ifdef CONFIG_DEBUG_INFO_SPLIT 849DEBUG_CFLAGS += -gsplit-dwarf 850else 851DEBUG_CFLAGS += -g 852endif 853 854ifneq ($(LLVM_IAS),1) 855KBUILD_AFLAGS += -Wa,-gdwarf-2 856endif 857 858ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 859dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 860dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 861DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 862endif 863 864ifdef CONFIG_DEBUG_INFO_REDUCED 865DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 866 $(call cc-option,-fno-var-tracking) 867endif 868 869ifdef CONFIG_DEBUG_INFO_COMPRESSED 870DEBUG_CFLAGS += -gz=zlib 871KBUILD_AFLAGS += -gz=zlib 872KBUILD_LDFLAGS += --compress-debug-sections=zlib 873endif 874 875endif # CONFIG_DEBUG_INFO 876 877KBUILD_CFLAGS += $(DEBUG_CFLAGS) 878export DEBUG_CFLAGS 879 880ifdef CONFIG_FUNCTION_TRACER 881ifdef CONFIG_FTRACE_MCOUNT_USE_CC 882 CC_FLAGS_FTRACE += -mrecord-mcount 883 ifdef CONFIG_HAVE_NOP_MCOUNT 884 ifeq ($(call cc-option-yn, -mnop-mcount),y) 885 CC_FLAGS_FTRACE += -mnop-mcount 886 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 887 endif 888 endif 889endif 890ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 891 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 892endif 893ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 894 ifdef CONFIG_HAVE_C_RECORDMCOUNT 895 BUILD_C_RECORDMCOUNT := y 896 export BUILD_C_RECORDMCOUNT 897 endif 898endif 899ifdef CONFIG_HAVE_FENTRY 900 ifeq ($(call cc-option-yn, -mfentry),y) 901 CC_FLAGS_FTRACE += -mfentry 902 CC_FLAGS_USING += -DCC_USING_FENTRY 903 endif 904endif 905export CC_FLAGS_FTRACE 906KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 907KBUILD_AFLAGS += $(CC_FLAGS_USING) 908endif 909 910# We trigger additional mismatches with less inlining 911ifdef CONFIG_DEBUG_SECTION_MISMATCH 912KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 913endif 914 915ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 916KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 917LDFLAGS_vmlinux += --gc-sections 918endif 919 920ifdef CONFIG_SHADOW_CALL_STACK 921CC_FLAGS_SCS := -fsanitize=shadow-call-stack 922KBUILD_CFLAGS += $(CC_FLAGS_SCS) 923export CC_FLAGS_SCS 924endif 925 926ifdef CONFIG_LTO_CLANG 927ifdef CONFIG_LTO_CLANG_THIN 928CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 929KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 930else 931CC_FLAGS_LTO := -flto 932endif 933CC_FLAGS_LTO += -fvisibility=hidden 934 935# Limit inlining across translation units to reduce binary size 936KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 937 938# Check for frame size exceeding threshold during prolog/epilog insertion 939# when using lld < 13.0.0. 940ifneq ($(CONFIG_FRAME_WARN),0) 941ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 942KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 943endif 944endif 945endif 946 947ifdef CONFIG_LTO 948KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 949KBUILD_AFLAGS += -fno-lto 950export CC_FLAGS_LTO 951endif 952 953ifdef CONFIG_CFI_CLANG 954CC_FLAGS_CFI := -fsanitize=cfi \ 955 -fsanitize-cfi-cross-dso \ 956 -fno-sanitize-cfi-canonical-jump-tables \ 957 -fno-sanitize-trap=cfi \ 958 -fno-sanitize-blacklist 959 960ifdef CONFIG_CFI_PERMISSIVE 961CC_FLAGS_CFI += -fsanitize-recover=cfi 962endif 963 964# If LTO flags are filtered out, we must also filter out CFI. 965CC_FLAGS_LTO += $(CC_FLAGS_CFI) 966KBUILD_CFLAGS += $(CC_FLAGS_CFI) 967export CC_FLAGS_CFI 968endif 969 970ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 971KBUILD_CFLAGS += -falign-functions=32 972endif 973 974# arch Makefile may override CC so keep this after arch Makefile is included 975NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 976 977# warn about C99 declaration after statement 978KBUILD_CFLAGS += -Wdeclaration-after-statement 979 980# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 981KBUILD_CFLAGS += -Wvla 982 983# disable pointer signed / unsigned warnings in gcc 4.0 984KBUILD_CFLAGS += -Wno-pointer-sign 985 986# disable stringop warnings in gcc 8+ 987KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 988 989# We'll want to enable this eventually, but it's not going away for 5.7 at least 990KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 991KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 992KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 993 994# Another good warning that we'll want to enable eventually 995KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 996 997# Enabled with W=2, disabled by default as noisy 998KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 999 1000# disable invalid "can't wrap" optimizations for signed / pointers
1001KBUILD_CFLAGS += -fno-strict-overflow 1002 1003# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1004KBUILD_CFLAGS += -fno-stack-check 1005 1006# conserve stack if available 1007KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 1008 1009# Prohibit date/time macros, which would make the build non-deterministic 1010KBUILD_CFLAGS += -Werror=date-time 1011 1012# enforce correct pointer usage 1013KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1014 1015# Require designated initializers for all marked structures 1016KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1017 1018# change __FILE__ to the relative path from the srctree 1019KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1020 1021# include additional Makefiles when needed 1022include-y := scripts/Makefile.extrawarn 1023include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1024include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1025include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1026include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1027include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1028 1029include $(addprefix $(srctree)/, $(include-y)) 1030 1031# scripts/Makefile.gcc-plugins is intentionally included last. 1032# Do not add $(call cc-option,...) below this line. When you build the kernel 1033# from the clean source tree, the GCC plugins do not exist at this point. 1034 1035# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1036KBUILD_CPPFLAGS += $(KCPPFLAGS) 1037KBUILD_AFLAGS += $(KAFLAGS) 1038KBUILD_CFLAGS += $(KCFLAGS) 1039 1040KBUILD_LDFLAGS_MODULE += --build-id=sha1 1041LDFLAGS_vmlinux += --build-id=sha1 1042 1043ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1044LDFLAGS_vmlinux += $(call ld-option, -X,) 1045endif 1046 1047ifeq ($(CONFIG_RELR),y) 1048LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1049endif 1050 1051# We never want expected sections to be placed heuristically by the 1052# linker. All sections should be explicitly named in the linker script. 1053ifdef CONFIG_LD_ORPHAN_WARN 1054LDFLAGS_vmlinux += --orphan-handling=warn 1055endif 1056 1057# Align the bit size of userspace programs with the kernel 1058KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1059KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1060 1061# make the checker run with the right architecture 1062CHECKFLAGS += --arch=$(ARCH) 1063 1064# insure the checker run with the right endianness 1065CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1066 1067# the checker needs the correct machine size 1068CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1069 1070# Default kernel image to build when no specific target is given. 1071# KBUILD_IMAGE may be overruled on the command line or 1072# set in the environment 1073# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1074# this default value 1075export KBUILD_IMAGE ?= vmlinux 1076 1077# 1078# INSTALL_PATH specifies where to place the updated kernel and system map 1079# images. Default is /boot, but you can set it to other values 1080export INSTALL_PATH ?= /boot 1081 1082# 1083# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1084# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1085# an argument if needed. Otherwise it defaults to the kernel install path 1086# 1087export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1088 1089# 1090# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1091# relocations required by build roots. This is not defined in the 1092# makefile but the argument can be passed to make if needed. 1093# 1094 1095MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1096export MODLIB 1097 1098HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1099 1100has_libelf = $(call try-run,\ 1101 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1102 1103ifdef CONFIG_STACK_VALIDATION 1104 ifeq ($(has_libelf),1) 1105 objtool_target := tools/objtool FORCE 1106 else 1107 SKIP_STACK_VALIDATION := 1 1108 export SKIP_STACK_VALIDATION 1109 endif 1110endif 1111 1112PHONY += resolve_btfids_clean 1113 1114resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1115 1116# tools/bpf/resolve_btfids directory might not exist 1117# in output directory, skip its clean in that case 1118resolve_btfids_clean: 1119ifneq ($(wildcard $(resolve_btfids_O)),) 1120 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1121endif 1122 1123ifdef CONFIG_BPF 1124ifdef CONFIG_DEBUG_INFO_BTF 1125 ifeq ($(has_libelf),1) 1126 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1127 else 1128 ERROR_RESOLVE_BTFIDS := 1 1129 endif 1130endif # CONFIG_DEBUG_INFO_BTF 1131endif # CONFIG_BPF 1132 1133PHONY += prepare0 1134 1135export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1136export MODORDER := $(extmod_prefix)modules.order 1137export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1138 1139ifeq ($(KBUILD_EXTMOD),) 1140core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1141 1142vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1143 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1144 $(libs-y) $(libs-m))) 1145 1146vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1147 $(patsubst %/,%,$(filter %/, $(core-) \ 1148 $(drivers-) $(libs-)))) 1149 1150subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1151 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1152 $(drivers-y) $(drivers-m))) 1153 1154build-dirs := $(vmlinux-dirs) 1155clean-dirs := $(vmlinux-alldirs) 1156 1157# Externally visible symbols (used by link-vmlinux.sh) 1158KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1159KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1160ifdef CONFIG_MODULES 1161KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1162KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1163else 1164KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1165endif 1166KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1167 1168export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1169export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1170# used by scripts/Makefile.package 1171export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1172 1173vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1174 1175# Recurse until adjust_autoksyms.sh is satisfied 1176PHONY += autoksyms_recursive 1177ifdef CONFIG_TRIM_UNUSED_KSYMS 1178# For the kernel to actually contain only the needed exported symbols, 1179# we have to build modules as well to determine what those symbols are. 1180# (this can be evaluated only once include/config/auto.conf has been included) 1181KBUILD_MODULES := 1 1182 1183autoksyms_recursive: descend modules.order 1184 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1185 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1186endif 1187 1188autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1189 1190quiet_cmd_autoksyms_h = GEN $@ 1191 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1192 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1193 1194$(autoksyms_h): 1195 $(call cmd,autoksyms_h) 1196 1197ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1198 1199# Final link of vmlinux with optional arch pass after final link 1200cmd_link-vmlinux = \ 1201 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1202 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1203 1204vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1205 +$(call if_changed_dep,link-vmlinux) 1206 1207targets := vmlinux 1208 1209# The actual objects are generated when descending, 1210# make sure no implicit rule kicks in 1211$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1212 1213filechk_kernel.release = \ 1214 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1215 1216# Store (new) KERNELRELEASE string in include/config/kernel.release 1217include/config/kernel.release: FORCE 1218 $(call filechk,kernel.release) 1219 1220# Additional helpers built in scripts/ 1221# Carefully list dependencies so we do not try to build scripts twice 1222# in parallel 1223PHONY += scripts 1224scripts: scripts_basic scripts_dtc 1225 $(Q)$(MAKE) $(build)=$(@) 1226 1227# Things we need to do before we recursively start building the kernel 1228# or the modules are listed in "prepare". 1229# A multi level approach is used. prepareN is processed before prepareN-1. 1230# archprepare is used in arch Makefiles and when processed asm symlink, 1231# version.h and scripts_basic is processed / created. 1232 1233PHONY += prepare archprepare 1234 1235archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1236 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1237 include/generated/autoconf.h remove-stale-files 1238 1239prepare0: archprepare 1240 $(Q)$(MAKE) $(build)=scripts/mod 1241 $(Q)$(MAKE) $(build)=. 1242 1243# All the preparing.. 1244prepare: prepare0 prepare-objtool prepare-resolve_btfids 1245 1246PHONY += remove-stale-files 1247remove-stale-files: 1248 $(Q)$(srctree)/scripts/remove-stale-files 1249 1250# Support for using generic headers in asm-generic 1251asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1252 1253PHONY += asm-generic uapi-asm-generic 1254asm-generic: uapi-asm-generic 1255 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1256 generic=include/asm-generic 1257uapi-asm-generic: 1258 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1259 generic=include/uapi/asm-generic 1260 1261PHONY += prepare-objtool prepare-resolve_btfids 1262prepare-objtool: $(objtool_target) 1263ifeq ($(SKIP_STACK_VALIDATION),1) 1264ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1265 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1266 @false 1267endif 1268ifdef CONFIG_UNWINDER_ORC 1269 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1270 @false 1271else 1272 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1273endif 1274endif 1275 1276prepare-resolve_btfids: $(resolve_btfids_target) 1277ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1278 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1279 @false 1280endif 1281# Generate some files 1282# --------------------------------------------------------------------------- 1283 1284# KERNELRELEASE can change from a few different places, meaning version.h 1285# needs to be updated, so this check is forced on all builds 1286 1287uts_len := 64 1288define filechk_utsrelease.h 1289 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1290 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1291 exit 1; \ 1292 fi; \ 1293 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1294endef 1295 1296define filechk_version.h 1297 if [ $(SUBLEVEL) -gt 255 ]; then \ 1298 echo \#define LINUX_VERSION_CODE $(shell \ 1299 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1300 else \ 1301 echo \#define LINUX_VERSION_CODE $(shell \ 1302 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1303 fi; \ 1304 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1305 ((c) > 255 ? 255 : (c)))'; \ 1306 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1307 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1308 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1309endef 1310 1311$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1312$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1313$(version_h): FORCE 1314 $(call filechk,version.h) 1315 1316include/generated/utsrelease.h: include/config/kernel.release FORCE 1317 $(call filechk,utsrelease.h) 1318 1319PHONY += headerdep 1320headerdep: 1321 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1322 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1323 1324# --------------------------------------------------------------------------- 1325# Kernel headers 1326 1327#Default location for installed headers 1328export INSTALL_HDR_PATH = $(objtree)/usr 1329 1330quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1331 cmd_headers_install = \ 1332 mkdir -p $(INSTALL_HDR_PATH); \ 1333 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1334 usr/include $(INSTALL_HDR_PATH) 1335 1336PHONY += headers_install 1337headers_install: headers 1338 $(call cmd,headers_install) 1339 1340PHONY += archheaders archscripts 1341 1342hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1343 1344PHONY += headers 1345headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1346 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1347 $(error Headers not exportable for the $(SRCARCH) architecture)) 1348 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1349 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1350 1351# Deprecated. It is no-op now. 1352PHONY += headers_check 1353headers_check: 1354 @echo >&2 "=================== WARNING ===================" 1355 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1356 @echo >&2 "and will be removed after Linux 5.15 release." 1357 @echo >&2 "Please remove headers_check from your scripts." 1358 @echo >&2 "===============================================" 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# Install 1370 1371# Many distributions have the custom install script, /sbin/installkernel. 1372# If DKMS is installed, 'make install' will eventually recuses back 1373# to the this Makefile to build and install external modules. 1374# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1375 1376install: sub_make_done := 1377 1378# Kernel selftest 1379 1380PHONY += kselftest 1381kselftest: 1382 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1383 1384kselftest-%: FORCE 1385 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1386 1387PHONY += kselftest-merge 1388kselftest-merge: 1389 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1390 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1391 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1392 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1393 1394# --------------------------------------------------------------------------- 1395# Devicetree files 1396 1397ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1398dtstree := arch/$(SRCARCH)/boot/dts 1399endif 1400 1401ifneq ($(dtstree),) 1402 1403%.dtb: include/config/kernel.release scripts_dtc 1404 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1405 1406%.dtbo: include/config/kernel.release scripts_dtc 1407 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1408 1409PHONY += dtbs dtbs_install dtbs_check 1410dtbs: include/config/kernel.release scripts_dtc 1411 $(Q)$(MAKE) $(build)=$(dtstree) 1412 1413ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1414export CHECK_DTBS=y 1415dtbs: dt_binding_check 1416endif 1417 1418dtbs_check: dtbs 1419 1420dtbs_install: 1421 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1422 1423ifdef CONFIG_OF_EARLY_FLATTREE 1424all: dtbs 1425endif 1426 1427endif 1428 1429PHONY += scripts_dtc 1430scripts_dtc: scripts_basic 1431 $(Q)$(MAKE) $(build)=scripts/dtc 1432 1433ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1434export CHECK_DT_BINDING=y 1435endif 1436 1437PHONY += dt_binding_check 1438dt_binding_check: scripts_dtc 1439 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1440 1441# --------------------------------------------------------------------------- 1442# Modules 1443 1444ifdef CONFIG_MODULES 1445 1446# By default, build modules as well 1447 1448all: modules 1449 1450# When we're building modules with modversions, we need to consider 1451# the built-in objects during the descend as well, in order to 1452# make sure the checksums are up to date before we record them. 1453ifdef CONFIG_MODVERSIONS 1454 KBUILD_BUILTIN := 1 1455endif 1456 1457# Build modules 1458# 1459# A module can be listed more than once in obj-m resulting in 1460# duplicate lines in modules.order files. Those are removed 1461# using awk while concatenating to the final file. 1462 1463PHONY += modules 1464modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1465 1466cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1467 1468modules.order: $(subdir-modorder) FORCE 1469 $(call if_changed,modules_order) 1470 1471targets += modules.order 1472 1473# Target to prepare building external modules 1474PHONY += modules_prepare 1475modules_prepare: prepare 1476 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1477 1478export modules_sign_only := 1479 1480ifeq ($(CONFIG_MODULE_SIG),y) 1481PHONY += modules_sign 1482modules_sign: modules_install 1483 @: 1484 1485# modules_sign is a subset of modules_install. 1486# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1487ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1488modules_sign_only := y 1489endif 1490endif 1491 1492modinst_pre := 1493ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1494modinst_pre := __modinst_pre 1495endif 1496 1497modules_install: $(modinst_pre) 1498PHONY += __modinst_pre 1499__modinst_pre: 1500 @rm -rf $(MODLIB)/kernel 1501 @rm -f $(MODLIB)/source 1502 @mkdir -p $(MODLIB)/kernel 1503 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1504 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1505 rm -f $(MODLIB)/build ; \ 1506 ln -s $(CURDIR) $(MODLIB)/build ; \ 1507 fi 1508 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1509 @cp -f modules.builtin $(MODLIB)/ 1510 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1511 1512endif # CONFIG_MODULES 1513 1514### 1515# Cleaning is done on three levels. 1516# make clean Delete most generated files 1517# Leave enough to build external modules 1518# make mrproper Delete the current configuration, and all generated files 1519# make distclean Remove editor backup files, patch leftover files and the like 1520 1521# Directories & files removed with 'make clean' 1522CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1523 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1524 compile_commands.json .thinlto-cache 1525 1526# Directories & files removed with 'make mrproper' 1527MRPROPER_FILES += include/config include/generated \ 1528 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1529 debian snap tar-install \ 1530 .config .config.old .version \ 1531 Module.symvers \ 1532 certs/signing_key.pem certs/signing_key.x509 \ 1533 certs/x509.genkey \ 1534 vmlinux-gdb.py \ 1535 *.spec 1536 1537# clean - Delete most, but leave enough to build external modules 1538# 1539clean: rm-files := $(CLEAN_FILES) 1540 1541PHONY += archclean vmlinuxclean 1542 1543vmlinuxclean: 1544 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1545 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1546 1547clean: archclean vmlinuxclean resolve_btfids_clean 1548 1549# mrproper - Delete all generated files, including .config 1550# 1551mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1552mrproper-dirs := $(addprefix _mrproper_,scripts) 1553 1554PHONY += $(mrproper-dirs) mrproper 1555$(mrproper-dirs): 1556 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1557 1558mrproper: clean $(mrproper-dirs) 1559 $(call cmd,rmfiles) 1560 1561# distclean 1562# 1563PHONY += distclean 1564 1565distclean: mrproper 1566 @find . $(RCS_FIND_IGNORE) \ 1567 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1568 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1569 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1570 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1571 -type f -print | xargs rm -f 1572 1573 1574# Packaging of the kernel to various formats 1575# --------------------------------------------------------------------------- 1576 1577%src-pkg: FORCE 1578 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1579%pkg: include/config/kernel.release FORCE 1580 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1581 1582# Brief documentation of the typical targets used 1583# --------------------------------------------------------------------------- 1584 1585boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1586boards := $(sort $(notdir $(boards))) 1587board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1588board-dirs := $(sort $(notdir $(board-dirs:/=))) 1589 1590PHONY += help 1591help: 1592 @echo 'Cleaning targets:' 1593 @echo ' clean - Remove most generated files but keep the config and' 1594 @echo ' enough build support to build external modules' 1595 @echo ' mrproper - Remove all generated files + config + various backup files' 1596 @echo ' distclean - mrproper + remove editor backup and patch files' 1597 @echo '' 1598 @echo 'Configuration targets:' 1599 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1600 @echo '' 1601 @echo 'Other generic targets:' 1602 @echo ' all - Build all targets marked with [*]' 1603 @echo '* vmlinux - Build the bare kernel' 1604 @echo '* modules - Build all modules' 1605 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1606 @echo ' dir/ - Build all files in dir and below' 1607 @echo ' dir/file.[ois] - Build specified target only' 1608 @echo ' dir/file.ll - Build the LLVM assembly file' 1609 @echo ' (requires compiler support for LLVM assembly generation)' 1610 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1611 @echo ' (requires a recent binutils and recent build (System.map))' 1612 @echo ' dir/file.ko - Build module including final link' 1613 @echo ' modules_prepare - Set up for building external modules' 1614 @echo ' tags/TAGS - Generate tags file for editors' 1615 @echo ' cscope - Generate cscope index' 1616 @echo ' gtags - Generate GNU GLOBAL index' 1617 @echo ' kernelrelease - Output the release version string (use with make -s)' 1618 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1619 @echo ' image_name - Output the image name (use with make -s)' 1620 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1621 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1622 echo '' 1623 @echo 'Static analysers:' 1624 @echo ' checkstack - Generate a list of stack hogs' 1625 @echo ' versioncheck - Sanity check on version.h usage' 1626 @echo ' includecheck - Check for duplicate included header files' 1627 @echo ' export_report - List the usages of all exported symbols' 1628 @echo ' headerdep - Detect inclusion cycles in headers' 1629 @echo ' coccicheck - Check with Coccinelle' 1630 @echo ' clang-analyzer - Check with clang static analyzer' 1631 @echo ' clang-tidy - Check with clang-tidy' 1632 @echo '' 1633 @echo 'Tools:' 1634 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1635 @echo '' 1636 @echo 'Kernel selftest:' 1637 @echo ' kselftest - Build and run kernel selftest' 1638 @echo ' Build, install, and boot kernel before' 1639 @echo ' running kselftest on it' 1640 @echo ' Run as root for full coverage' 1641 @echo ' kselftest-all - Build kernel selftest' 1642 @echo ' kselftest-install - Build and install kernel selftest' 1643 @echo ' kselftest-clean - Remove all generated kselftest files' 1644 @echo ' kselftest-merge - Merge all the config dependencies of' 1645 @echo ' kselftest to existing .config.' 1646 @echo '' 1647 @$(if $(dtstree), \ 1648 echo 'Devicetree:'; \ 1649 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1650 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1651 echo ' dt_binding_check - Validate device tree binding documents'; \ 1652 echo ' dtbs_check - Validate device tree source files';\ 1653 echo '') 1654 1655 @echo 'Userspace tools targets:' 1656 @echo ' use "make tools/help"' 1657 @echo ' or "cd tools; make help"' 1658 @echo '' 1659 @echo 'Kernel packaging:' 1660 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1661 @echo '' 1662 @echo 'Documentation targets:' 1663 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1664 @echo '' 1665 @echo 'Architecture specific targets ($(SRCARCH)):' 1666 @$(if $(archhelp),$(archhelp),\ 1667 echo ' No architecture specific help defined for $(SRCARCH)') 1668 @echo '' 1669 @$(if $(boards), \ 1670 $(foreach b, $(boards), \ 1671 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1672 echo '') 1673 @$(if $(board-dirs), \ 1674 $(foreach b, $(board-dirs), \ 1675 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1676 printf " %-16s - Show all of the above\\n" help-boards; \ 1677 echo '') 1678 1679 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1680 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1681 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1682 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1683 @echo ' (sparse by default)' 1684 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1685 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1686 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1687 @echo ' 1: warnings which may be relevant and do not occur too often' 1688 @echo ' 2: warnings which occur quite often but may still be relevant' 1689 @echo ' 3: more obscure warnings, can most likely be ignored' 1690 @echo ' Multiple levels can be combined with W=12 or W=123' 1691 @echo '' 1692 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1693 @echo 'For further info see the ./README file' 1694 1695 1696help-board-dirs := $(addprefix help-,$(board-dirs)) 1697 1698help-boards: $(help-board-dirs) 1699 1700boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1701 1702$(help-board-dirs): help-%: 1703 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1704 @$(if $(boards-per-dir), \ 1705 $(foreach b, $(boards-per-dir), \ 1706 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1707 echo '') 1708 1709 1710# Documentation targets 1711# --------------------------------------------------------------------------- 1712DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1713 linkcheckdocs dochelp refcheckdocs 1714PHONY += $(DOC_TARGETS) 1715$(DOC_TARGETS): 1716 $(Q)$(MAKE) $(build)=Documentation $@ 1717 1718# Misc 1719# --------------------------------------------------------------------------- 1720 1721PHONY += scripts_gdb 1722scripts_gdb: prepare0 1723 $(Q)$(MAKE) $(build)=scripts/gdb 1724 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1725 1726ifdef CONFIG_GDB_SCRIPTS 1727all: scripts_gdb 1728endif 1729 1730else # KBUILD_EXTMOD 1731 1732### 1733# External module support. 1734# When building external modules the kernel used as basis is considered 1735# read-only, and no consistency checks are made and the make 1736# system is not used on the basis kernel. If updates are required 1737# in the basis kernel ordinary make commands (without M=...) must be used. 1738 1739# We are always building only modules. 1740KBUILD_BUILTIN := 1741KBUILD_MODULES := 1 1742 1743build-dirs := $(KBUILD_EXTMOD) 1744$(MODORDER): descend 1745 @: 1746 1747compile_commands.json: $(extmod_prefix)compile_commands.json 1748PHONY += compile_commands.json 1749 1750clean-dirs := $(KBUILD_EXTMOD) 1751clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1752 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1753 1754PHONY += help 1755help: 1756 @echo ' Building external modules.' 1757 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1758 @echo '' 1759 @echo ' modules - default target, build the module(s)' 1760 @echo ' modules_install - install the module' 1761 @echo ' clean - remove generated files in module directory only' 1762 @echo '' 1763 1764# no-op for external module builds 1765PHONY += prepare modules_prepare 1766 1767endif # KBUILD_EXTMOD 1768 1769# --------------------------------------------------------------------------- 1770# Modules 1771 1772PHONY += modules modules_install 1773 1774ifdef CONFIG_MODULES 1775 1776modules: modules_check 1777 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1778 1779PHONY += modules_check 1780modules_check: $(MODORDER) 1781 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1782 1783quiet_cmd_depmod = DEPMOD $(MODLIB) 1784 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1785 $(KERNELRELEASE) 1786 1787modules_install: 1788 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1789 $(call cmd,depmod) 1790 1791else # CONFIG_MODULES 1792 1793# Modules not configured 1794# --------------------------------------------------------------------------- 1795 1796modules modules_install: 1797 @echo >&2 '***' 1798 @echo >&2 '*** The present kernel configuration has modules disabled.' 1799 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1800 @echo >&2 '*** to enable CONFIG_MODULES.' 1801 @echo >&2 '***' 1802 @exit 1 1803 1804endif # CONFIG_MODULES 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 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1875 -o -name '*.ko.*' \ 1876 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1877 -o -name '*.dwo' -o -name '*.lst' \ 1878 -o -name '*.su' -o -name '*.mod' \ 1879 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1880 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1881 -o -name '*.asn1.[ch]' \ 1882 -o -name '*.symtypes' -o -name 'modules.order' \ 1883 -o -name '.tmp_*.o.*' \ 1884 -o -name '*.c.[012]*.*' \ 1885 -o -name '*.ll' \ 1886 -o -name '*.gcno' \ 1887 -o -name '*.*.symversions' \) -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# read saved command lines for existing targets 1995existing-targets := $(wildcard $(sort $(targets))) 1996 1997-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1998 1999endif # config-build 2000endif # mixed-build
2001endif # need-sub-make 2002 2003PHONY += FORCE 2004FORCE: 2005 2006# Declare the contents of the PHONY variable as phony. We keep that 2007# information in a variable so we can use it in if_changed and friends. 2008.PHONY: $(PHONY) 2009