1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Superb Owl 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# --included-dir is added for backward compatibility, but you should not rely on 195# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197endif 198 199ifneq ($(filter 3.%,$(MAKE_VERSION)),) 200# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 201# We need to invoke sub-make to avoid implicit rules in the top Makefile. 202need-sub-make := 1 203# Cancel implicit rules for this Makefile. 204$(this-makefile): ; 205endif 206 207export abs_srctree abs_objtree 208export sub_make_done := 1 209 210ifeq ($(need-sub-make),1) 211 212PHONY += $(MAKECMDGOALS) __sub-make 213 214$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 215 @: 216 217# Invoke a second make in the output directory, passing relevant variables 218__sub-make: 219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 220 221endif # need-sub-make 222endif # sub_make_done 223 224# We process the rest of the Makefile if this is the final invocation of make 225ifeq ($(need-sub-make),) 226 227# Do not print "Entering directory ...", 228# but we want to display it when entering to the output directory 229# so that IDEs/editors are able to understand relative filenames. 230MAKEFLAGS += --no-print-directory 231 232ifeq ($(abs_srctree),$(abs_objtree)) 233 # building in the source tree 234 srctree := . 235 building_out_of_srctree := 236else 237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 238 # building in a subdirectory of the source tree 239 srctree := .. 240 else 241 srctree := $(abs_srctree) 242 endif 243 building_out_of_srctree := 1 244endif 245 246ifneq ($(KBUILD_ABS_SRCTREE),) 247srctree := $(abs_srctree) 248endif 249 250objtree := . 251VPATH := $(srctree) 252 253export building_out_of_srctree srctree objtree VPATH 254 255# To make sure we do not include .config for any of the *config targets 256# catch them early, and hand them over to scripts/kconfig/Makefile 257# It is allowed to specify more targets when calling make, including 258# mixing *config targets and build targets. 259# For example 'make oldconfig all'. 260# Detect when mixed targets is specified, and make a second invocation 261# of make so .config is not included in this case either (for *config). 262 263version_h := include/generated/uapi/linux/version.h 264 265clean-targets := %clean mrproper cleandocs 266no-dot-config-targets := $(clean-targets) \ 267 cscope gtags TAGS tags help% %docs check% coccicheck \ 268 $(version_h) headers headers_% archheaders archscripts \ 269 %asm-generic kernelversion %src-pkg dt_binding_check \ 270 outputmakefile 271# Installation targets should not require compiler. Unfortunately, vdso_install 272# is an exception where build artifacts may be updated. This must be fixed. 273no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 274 headers_install modules_install kernelrelease image_name 275no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 276 image_name 277single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 278 279config-build := 280mixed-build := 281need-config := 1 282need-compiler := 1 283may-sync-config := 1 284single-build := 285 286ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 need-config := 289 endif 290endif 291 292ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 294 need-compiler := 295 endif 296endif 297 298ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 may-sync-config := 301 endif 302endif 303 304ifneq ($(KBUILD_EXTMOD),) 305 may-sync-config := 306endif 307 308ifeq ($(KBUILD_EXTMOD),) 309 ifneq ($(filter %config,$(MAKECMDGOALS)),) 310 config-build := 1 311 ifneq ($(words $(MAKECMDGOALS)),1) 312 mixed-build := 1 313 endif 314 endif 315endif 316 317# We cannot build single targets and the others at the same time 318ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 319 single-build := 1 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325# For "make -j clean all", "make -j mrproper defconfig all", etc. 326ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# install and modules_install need also be processed one by one 333ifneq ($(filter install,$(MAKECMDGOALS)),) 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339ifdef mixed-build 340# =========================================================================== 341# We're called with mixed targets (*config and build targets). 342# Handle them one by one. 343 344PHONY += $(MAKECMDGOALS) __build_one_by_one 345 346$(MAKECMDGOALS): __build_one_by_one 347 @: 348 349__build_one_by_one: 350 $(Q)set -e; \ 351 for i in $(MAKECMDGOALS); do \ 352 $(MAKE) -f $(srctree)/Makefile $$i; \ 353 done 354 355else # !mixed-build 356 357include $(srctree)/scripts/Kbuild.include 358 359# Read KERNELRELEASE from include/config/kernel.release (if it exists) 360KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 361KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 363 364include $(srctree)/scripts/subarch.include 365 366# Cross compiling and selecting different set of gcc/bin-utils 367# --------------------------------------------------------------------------- 368# 369# When performing cross compilation for other architectures ARCH shall be set 370# to the target architecture. (See arch/* for the possibilities). 371# ARCH can be set during invocation of make: 372# make ARCH=ia64 373# Another way is to have ARCH set in the environment. 374# The default ARCH is the host where make is executed. 375 376# CROSS_COMPILE specify the prefix used for all executables used 377# during compilation. Only gcc and related bin-utils executables 378# are prefixed with $(CROSS_COMPILE). 379# CROSS_COMPILE can be set on the command line 380# make CROSS_COMPILE=ia64-linux- 381# Alternatively CROSS_COMPILE can be set in the environment. 382# Default value for CROSS_COMPILE is not to prefix executables 383# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 384ARCH ?= $(SUBARCH) 385 386# Architecture as present in compile.h 387UTS_MACHINE := $(ARCH) 388SRCARCH := $(ARCH) 389 390# Additional ARCH settings for x86 391ifeq ($(ARCH),i386) 392 SRCARCH := x86 393endif 394ifeq ($(ARCH),x86_64) 395 SRCARCH := x86 396endif 397 398# Additional ARCH settings for sparc 399ifeq ($(ARCH),sparc32) 400 SRCARCH := sparc 401endif 402ifeq ($(ARCH),sparc64) 403 SRCARCH := sparc 404endif 405 406# Additional ARCH settings for parisc 407ifeq ($(ARCH),parisc64) 408 SRCARCH := parisc 409endif 410 411export cross_compiling := 412ifneq ($(SRCARCH),$(SUBARCH)) 413cross_compiling := 1 414endif 415 416KCONFIG_CONFIG ?= .config 417export KCONFIG_CONFIG 418 419# SHELL used by kbuild 420CONFIG_SHELL := sh 421 422HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 423HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 424HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 425 426ifneq ($(LLVM),) 427ifneq ($(filter %/,$(LLVM)),) 428LLVM_PREFIX := $(LLVM) 429else ifneq ($(filter -%,$(LLVM)),) 430LLVM_SUFFIX := $(LLVM) 431endif 432 433HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 434HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 435else 436HOSTCC = gcc 437HOSTCXX = g++ 438endif 439 440KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 441 -O2 -fomit-frame-pointer -std=gnu89 442KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 443KBUILD_USERLDFLAGS := $(USERLDFLAGS) 444 445KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 446KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 447KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 448KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 449 450# Make variables (CC, etc...) 451CPP = $(CC) -E 452ifneq ($(LLVM),) 453CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 454LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 455AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 456NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 457OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 458OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 459READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 460STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 461else 462CC = $(CROSS_COMPILE)gcc 463LD = $(CROSS_COMPILE)ld 464AR = $(CROSS_COMPILE)ar 465NM = $(CROSS_COMPILE)nm 466OBJCOPY = $(CROSS_COMPILE)objcopy 467OBJDUMP = $(CROSS_COMPILE)objdump 468READELF = $(CROSS_COMPILE)readelf 469STRIP = $(CROSS_COMPILE)strip 470endif 471PAHOLE = pahole 472RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 473LEX = flex 474YACC = bison 475AWK = awk 476INSTALLKERNEL := installkernel 477DEPMOD = depmod 478PERL = perl 479PYTHON3 = python3 480CHECK = sparse 481BASH = bash 482KGZIP = gzip 483KBZIP2 = bzip2 484KLZOP = lzop 485LZMA = lzma 486LZ4 = lz4c 487XZ = xz 488ZSTD = zstd 489 490PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 491 492CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 493 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 494NOSTDINC_FLAGS := 495CFLAGS_MODULE = 496AFLAGS_MODULE = 497LDFLAGS_MODULE = 498CFLAGS_KERNEL = 499AFLAGS_KERNEL = 500LDFLAGS_vmlinux = 501 502# Use USERINCLUDE when you must reference the UAPI directories only. 503USERINCLUDE := \ 504 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 505 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 506 -I$(srctree)/include/uapi \ 507 -I$(objtree)/include/generated/uapi \ 508 -include $(srctree)/include/linux/compiler-version.h \ 509 -include $(srctree)/include/linux/kconfig.h 510 511# Use LINUXINCLUDE when you must reference the include/ directory. 512# Needed to be compatible with the O= option 513LINUXINCLUDE := \ 514 -I$(srctree)/arch/$(SRCARCH)/include \ 515 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 516 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 517 -I$(objtree)/include \ 518 $(USERINCLUDE) 519 520KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 521KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 522 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 523 -Werror=implicit-function-declaration -Werror=implicit-int \ 524 -Werror=return-type -Wno-format-security \ 525 -std=gnu89 526KBUILD_CPPFLAGS := -D__KERNEL__ 527KBUILD_AFLAGS_KERNEL := 528KBUILD_CFLAGS_KERNEL := 529KBUILD_AFLAGS_MODULE := -DMODULE 530KBUILD_CFLAGS_MODULE := -DMODULE 531KBUILD_LDFLAGS_MODULE := 532KBUILD_LDFLAGS := 533CLANG_FLAGS := 534 535export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 536export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 537export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 538export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 539export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 540export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 541 542export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 543export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 544export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 545export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 546export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 547export PAHOLE_FLAGS 548 549# Files to ignore in find ... statements 550 551export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 552 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 553 -prune -o 554export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 555 --exclude CVS --exclude .pc --exclude .hg --exclude .git 556 557# =========================================================================== 558# Rules shared between *config targets and build targets 559 560# Basic helpers built in scripts/basic/ 561PHONY += scripts_basic 562scripts_basic: 563 $(Q)$(MAKE) $(build)=scripts/basic 564 565PHONY += outputmakefile 566ifdef building_out_of_srctree 567# Before starting out-of-tree build, make sure the source tree is clean. 568# outputmakefile generates a Makefile in the output directory, if using a 569# separate output directory. This allows convenient use of make in the 570# output directory. 571# At the same time when output Makefile generated, generate .gitignore to 572# ignore whole output directory 573 574quiet_cmd_makefile = GEN Makefile 575 cmd_makefile = { \ 576 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 577 echo "include $(srctree)/Makefile"; \ 578 } > Makefile 579 580outputmakefile: 581 $(Q)if [ -f $(srctree)/.config -o \ 582 -d $(srctree)/include/config -o \ 583 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 584 echo >&2 "***"; \ 585 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 586 echo >&2 "*** in $(abs_srctree)";\ 587 echo >&2 "***"; \ 588 false; \ 589 fi 590 $(Q)ln -fsn $(srctree) source 591 $(call cmd,makefile) 592 $(Q)test -e .gitignore || \ 593 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 594endif 595 596# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 597# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 598# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 599# and from include/config/auto.conf.cmd to detect the compiler upgrade. 600CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 601 602ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 603include $(srctree)/scripts/Makefile.clang 604endif 605 606# Include this also for config targets because some architectures need 607# cc-cross-prefix to determine CROSS_COMPILE. 608ifdef need-compiler 609include $(srctree)/scripts/Makefile.compiler 610endif 611 612ifdef config-build 613# =========================================================================== 614# *config targets only - make sure prerequisites are updated, and descend 615# in scripts/kconfig to make the *config target 616 617# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 618# KBUILD_DEFCONFIG may point out an alternative default configuration 619# used for 'make defconfig' 620include $(srctree)/arch/$(SRCARCH)/Makefile 621export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 622 623config: outputmakefile scripts_basic FORCE 624 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 625 626%config: outputmakefile scripts_basic FORCE 627 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 628 629else #!config-build 630# =========================================================================== 631# Build targets only - this includes vmlinux, arch specific targets, clean 632# targets and others. In general all targets except *config targets. 633 634# If building an external module we do not care about the all: rule 635# but instead __all depend on modules 636PHONY += all 637ifeq ($(KBUILD_EXTMOD),) 638__all: all 639else 640__all: modules 641endif 642 643# Decide whether to build built-in, modular, or both. 644# Normally, just do built-in. 645 646KBUILD_MODULES := 647KBUILD_BUILTIN := 1 648 649# If we have only "make modules", don't compile built-in objects. 650ifeq ($(MAKECMDGOALS),modules) 651 KBUILD_BUILTIN := 652endif 653 654# If we have "make <whatever> modules", compile modules 655# in addition to whatever we do anyway. 656# Just "make" or "make all" shall build modules as well 657 658ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 659 KBUILD_MODULES := 1 660endif 661 662ifeq ($(MAKECMDGOALS),) 663 KBUILD_MODULES := 1 664endif 665 666export KBUILD_MODULES KBUILD_BUILTIN 667 668ifdef need-config 669include include/config/auto.conf 670endif 671 672ifeq ($(KBUILD_EXTMOD),) 673# Objects we will link into vmlinux / subdirs we need to visit 674core-y := init/ usr/ arch/$(SRCARCH)/ 675drivers-y := drivers/ sound/ 676drivers-$(CONFIG_SAMPLES) += samples/ 677drivers-$(CONFIG_NET) += net/ 678drivers-y += virt/ 679libs-y := lib/ 680endif # KBUILD_EXTMOD 681 682# The all: target is the default when no target is given on the 683# command line. 684# This allow a user to issue only 'make' to build a kernel including modules 685# Defaults to vmlinux, but the arch makefile usually adds further targets 686all: vmlinux 687 688CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 689ifdef CONFIG_CC_IS_GCC 690CFLAGS_GCOV += -fno-tree-loop-im 691endif 692export CFLAGS_GCOV 693 694# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 695ifdef CONFIG_FUNCTION_TRACER 696 CC_FLAGS_FTRACE := -pg 697endif 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 += -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 763ifdef CONFIG_CC_IS_GCC 764# gcc-10 renamed --param=allow-store-data-races=0 to 765# -fno-allow-store-data-races. 766KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 767KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 768endif 769 770ifdef CONFIG_READABLE_ASM 771# Disable optimizations that make assembler listings hard to read. 772# reorder blocks reorders the control in the function 773# ipa clone creates specialized cloned functions 774# partial inlining inlines only parts of functions 775KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 776endif 777 778ifneq ($(CONFIG_FRAME_WARN),0) 779KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 780endif 781 782stackp-flags-y := -fno-stack-protector 783stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 784stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 785 786KBUILD_CFLAGS += $(stackp-flags-y) 787 788KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 789KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 790 791ifdef CONFIG_CC_IS_CLANG 792KBUILD_CPPFLAGS += -Qunused-arguments 793# The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable. 794KBUILD_CFLAGS += -Wno-gnu 795# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 796# source of a reference will be _MergedGlobals and not on of the whitelisted names. 797# See modpost pattern 2 798KBUILD_CFLAGS += -mno-global-merge 799else 800 801# gcc inanely warns about local variables called 'main' 802KBUILD_CFLAGS += -Wno-main 803endif 804 805# These warnings generated too much noise in a regular build. 806# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 807KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 808KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 809 810ifdef CONFIG_FRAME_POINTER 811KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 812else 813# Some targets (ARM with Thumb2, for example), can't be built with frame 814# pointers. For those, we don't have FUNCTION_TRACER automatically 815# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 816# incompatible with -fomit-frame-pointer with current GCC, so we don't use 817# -fomit-frame-pointer with FUNCTION_TRACER. 818ifndef CONFIG_FUNCTION_TRACER 819KBUILD_CFLAGS += -fomit-frame-pointer 820endif 821endif 822 823# Initialize all stack variables with a 0xAA pattern. 824ifdef CONFIG_INIT_STACK_ALL_PATTERN 825KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 826endif 827 828# Initialize all stack variables with a zero value. 829ifdef CONFIG_INIT_STACK_ALL_ZERO 830KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 831ifdef CONFIG_CC_IS_CLANG 832# https://bugs.llvm.org/show_bug.cgi?id=45497 833KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 834endif 835endif 836 837# While VLAs have been removed, GCC produces unreachable stack probes 838# for the randomize_kstack_offset feature. Disable it for all compilers. 839KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 840 841# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 842ifdef CONFIG_ZERO_CALL_USED_REGS 843KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 844endif 845 846ifdef CONFIG_FUNCTION_TRACER 847ifdef CONFIG_FTRACE_MCOUNT_USE_CC 848 CC_FLAGS_FTRACE += -mrecord-mcount 849 ifdef CONFIG_HAVE_NOP_MCOUNT 850 ifeq ($(call cc-option-yn, -mnop-mcount),y) 851 CC_FLAGS_FTRACE += -mnop-mcount 852 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 853 endif 854 endif 855endif 856ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 857 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 858endif 859ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 860 ifdef CONFIG_HAVE_C_RECORDMCOUNT 861 BUILD_C_RECORDMCOUNT := y 862 export BUILD_C_RECORDMCOUNT 863 endif 864endif 865ifdef CONFIG_HAVE_FENTRY 866 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 867 ifeq ($(call cc-option-yn, -mfentry),y) 868 CC_FLAGS_FTRACE += -mfentry 869 CC_FLAGS_USING += -DCC_USING_FENTRY 870 endif 871endif 872export CC_FLAGS_FTRACE 873KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 874KBUILD_AFLAGS += $(CC_FLAGS_USING) 875endif 876 877# We trigger additional mismatches with less inlining 878ifdef CONFIG_DEBUG_SECTION_MISMATCH 879KBUILD_CFLAGS += -fno-inline-functions-called-once 880endif 881 882ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 883KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 884LDFLAGS_vmlinux += --gc-sections 885endif 886 887ifdef CONFIG_SHADOW_CALL_STACK 888CC_FLAGS_SCS := -fsanitize=shadow-call-stack 889KBUILD_CFLAGS += $(CC_FLAGS_SCS) 890export CC_FLAGS_SCS 891endif 892 893ifdef CONFIG_LTO_CLANG 894ifdef CONFIG_LTO_CLANG_THIN 895CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 896KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 897else 898CC_FLAGS_LTO := -flto 899endif 900CC_FLAGS_LTO += -fvisibility=hidden 901 902# Limit inlining across translation units to reduce binary size 903KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 904 905# Check for frame size exceeding threshold during prolog/epilog insertion 906# when using lld < 13.0.0. 907ifneq ($(CONFIG_FRAME_WARN),0) 908ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 909KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 910endif 911endif 912endif 913 914ifdef CONFIG_LTO 915KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 916KBUILD_AFLAGS += -fno-lto 917export CC_FLAGS_LTO 918endif 919 920ifdef CONFIG_CFI_CLANG 921CC_FLAGS_CFI := -fsanitize=cfi \ 922 -fsanitize-cfi-cross-dso \ 923 -fno-sanitize-cfi-canonical-jump-tables \ 924 -fno-sanitize-trap=cfi \ 925 -fno-sanitize-blacklist 926 927ifdef CONFIG_CFI_PERMISSIVE 928CC_FLAGS_CFI += -fsanitize-recover=cfi 929endif 930 931# If LTO flags are filtered out, we must also filter out CFI. 932CC_FLAGS_LTO += $(CC_FLAGS_CFI) 933KBUILD_CFLAGS += $(CC_FLAGS_CFI) 934export CC_FLAGS_CFI 935endif 936 937ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 938KBUILD_CFLAGS += -falign-functions=64 939endif 940 941# arch Makefile may override CC so keep this after arch Makefile is included 942NOSTDINC_FLAGS += -nostdinc 943 944# warn about C99 declaration after statement 945KBUILD_CFLAGS += -Wdeclaration-after-statement 946 947# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 948KBUILD_CFLAGS += -Wvla 949 950# disable pointer signed / unsigned warnings in gcc 4.0 951KBUILD_CFLAGS += -Wno-pointer-sign 952 953# In order to make sure new function cast mismatches are not introduced 954# in the kernel (to avoid tripping CFI checking), the kernel should be 955# globally built with -Wcast-function-type. 956KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 957 958# disable stringop warnings in gcc 8+ 959KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 960 961# We'll want to enable this eventually, but it's not going away for 5.7 at least 962KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 963KBUILD_CFLAGS += -Wno-array-bounds 964KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 965 966# Another good warning that we'll want to enable eventually 967KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 968 969# Enabled with W=2, disabled by default as noisy 970ifdef CONFIG_CC_IS_GCC 971KBUILD_CFLAGS += -Wno-maybe-uninitialized 972endif 973 974ifdef CONFIG_CC_IS_GCC 975# The allocators already balk at large sizes, so silence the compiler 976# warnings for bounds checks involving those possible values. While 977# -Wno-alloc-size-larger-than would normally be used here, earlier versions 978# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 979# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 980# doesn't work (as it is documented to), silently resolving to "0" prior to 981# version 9.1 (and producing an error more recently). Numeric values larger 982# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 983# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 984# choice, we must perform a versioned check to disable this warning. 985# https://lore.kernel.org/lkml/[email protected] 986KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 987endif 988 989# disable invalid "can't wrap" optimizations for signed / pointers 990KBUILD_CFLAGS += -fno-strict-overflow 991 992# Make sure -fstack-check isn't enabled (like gentoo apparently did) 993KBUILD_CFLAGS += -fno-stack-check 994 995# conserve stack if available 996ifdef CONFIG_CC_IS_GCC 997KBUILD_CFLAGS += -fconserve-stack 998endif 999 1000# Prohibit date/time macros, which would make the build non-deterministic 1001KBUILD_CFLAGS += -Werror=date-time 1002 1003# enforce correct pointer usage 1004KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1005 1006# Require designated initializers for all marked structures 1007KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1008 1009# change __FILE__ to the relative path from the srctree 1010KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1011 1012# include additional Makefiles when needed 1013include-y := scripts/Makefile.extrawarn 1014include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1015include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1016include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1017include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1018include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1019include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1020 1021include $(addprefix $(srctree)/, $(include-y)) 1022 1023# scripts/Makefile.gcc-plugins is intentionally included last. 1024# Do not add $(call cc-option,...) below this line. When you build the kernel 1025# from the clean source tree, the GCC plugins do not exist at this point. 1026 1027# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1028KBUILD_CPPFLAGS += $(KCPPFLAGS) 1029KBUILD_AFLAGS += $(KAFLAGS) 1030KBUILD_CFLAGS += $(KCFLAGS) 1031 1032KBUILD_LDFLAGS_MODULE += --build-id=sha1 1033LDFLAGS_vmlinux += --build-id=sha1 1034 1035ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1036LDFLAGS_vmlinux += $(call ld-option, -X,) 1037endif 1038 1039ifeq ($(CONFIG_RELR),y) 1040LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1041endif 1042 1043# We never want expected sections to be placed heuristically by the 1044# linker. All sections should be explicitly named in the linker script. 1045ifdef CONFIG_LD_ORPHAN_WARN 1046LDFLAGS_vmlinux += --orphan-handling=warn 1047endif 1048 1049# Align the bit size of userspace programs with the kernel 1050KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1051KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1052 1053# make the checker run with the right architecture 1054CHECKFLAGS += --arch=$(ARCH) 1055 1056# insure the checker run with the right endianness 1057CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1058 1059# the checker needs the correct machine size 1060CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1061 1062# Default kernel image to build when no specific target is given. 1063# KBUILD_IMAGE may be overruled on the command line or 1064# set in the environment 1065# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1066# this default value 1067export KBUILD_IMAGE ?= vmlinux 1068 1069# 1070# INSTALL_PATH specifies where to place the updated kernel and system map 1071# images. Default is /boot, but you can set it to other values 1072export INSTALL_PATH ?= /boot 1073 1074# 1075# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1076# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1077# an argument if needed. Otherwise it defaults to the kernel install path 1078# 1079export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1080 1081# 1082# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1083# relocations required by build roots. This is not defined in the 1084# makefile but the argument can be passed to make if needed. 1085# 1086 1087MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1088export MODLIB 1089 1090PHONY += prepare0 1091 1092export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1093export MODORDER := $(extmod_prefix)modules.order 1094export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1095 1096ifeq ($(KBUILD_EXTMOD),) 1097core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1098core-$(CONFIG_BLOCK) += block/ 1099 1100vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1101 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1102 $(libs-y) $(libs-m))) 1103 1104vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1105 $(patsubst %/,%,$(filter %/, $(core-) \ 1106 $(drivers-) $(libs-)))) 1107 1108subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1109 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1110 $(drivers-y) $(drivers-m))) 1111 1112build-dirs := $(vmlinux-dirs) 1113clean-dirs := $(vmlinux-alldirs) 1114 1115# Externally visible symbols (used by link-vmlinux.sh) 1116KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1117KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1118ifdef CONFIG_MODULES 1119KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1120KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1121else 1122KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1123endif 1124KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1125 1126export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1127export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1128# used by scripts/Makefile.package 1129export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1130 1131vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1132 1133# Recurse until adjust_autoksyms.sh is satisfied 1134PHONY += autoksyms_recursive 1135ifdef CONFIG_TRIM_UNUSED_KSYMS 1136# For the kernel to actually contain only the needed exported symbols, 1137# we have to build modules as well to determine what those symbols are. 1138# (this can be evaluated only once include/config/auto.conf has been included) 1139KBUILD_MODULES := 1 1140 1141autoksyms_recursive: descend modules.order 1142 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1143 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1144endif 1145 1146autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1147 1148quiet_cmd_autoksyms_h = GEN $@ 1149 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1150 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1151 1152$(autoksyms_h): 1153 $(call cmd,autoksyms_h) 1154 1155ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1156 1157# Final link of vmlinux with optional arch pass after final link 1158cmd_link-vmlinux = \ 1159 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1160 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1161 1162vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1163 +$(call if_changed_dep,link-vmlinux) 1164 1165targets := vmlinux 1166 1167# The actual objects are generated when descending, 1168# make sure no implicit rule kicks in 1169$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1170 1171filechk_kernel.release = \ 1172 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1173 1174# Store (new) KERNELRELEASE string in include/config/kernel.release 1175include/config/kernel.release: FORCE 1176 $(call filechk,kernel.release) 1177 1178# Additional helpers built in scripts/ 1179# Carefully list dependencies so we do not try to build scripts twice 1180# in parallel 1181PHONY += scripts 1182scripts: scripts_basic scripts_dtc 1183 $(Q)$(MAKE) $(build)=$(@) 1184 1185# Things we need to do before we recursively start building the kernel 1186# or the modules are listed in "prepare". 1187# A multi level approach is used. prepareN is processed before prepareN-1. 1188# archprepare is used in arch Makefiles and when processed asm symlink, 1189# version.h and scripts_basic is processed / created. 1190 1191PHONY += prepare archprepare 1192 1193archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1194 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1195 include/generated/autoconf.h remove-stale-files 1196 1197prepare0: archprepare 1198 $(Q)$(MAKE) $(build)=scripts/mod 1199 $(Q)$(MAKE) $(build)=. 1200 1201# All the preparing.. 1202prepare: prepare0 1203 1204PHONY += remove-stale-files 1205remove-stale-files: 1206 $(Q)$(srctree)/scripts/remove-stale-files 1207 1208# Support for using generic headers in asm-generic 1209asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1210 1211PHONY += asm-generic uapi-asm-generic 1212asm-generic: uapi-asm-generic 1213 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1214 generic=include/asm-generic 1215uapi-asm-generic: 1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1217 generic=include/uapi/asm-generic 1218 1219# Generate some files 1220# --------------------------------------------------------------------------- 1221 1222# KERNELRELEASE can change from a few different places, meaning version.h 1223# needs to be updated, so this check is forced on all builds 1224 1225uts_len := 64 1226define filechk_utsrelease.h 1227 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1228 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1229 exit 1; \ 1230 fi; \ 1231 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1232endef 1233 1234define filechk_version.h 1235 if [ $(SUBLEVEL) -gt 255 ]; then \ 1236 echo \#define LINUX_VERSION_CODE $(shell \ 1237 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1238 else \ 1239 echo \#define LINUX_VERSION_CODE $(shell \ 1240 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1241 fi; \ 1242 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1243 ((c) > 255 ? 255 : (c)))'; \ 1244 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1245 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1246 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1247endef 1248 1249$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1250$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1251$(version_h): FORCE 1252 $(call filechk,version.h) 1253 1254include/generated/utsrelease.h: include/config/kernel.release FORCE 1255 $(call filechk,utsrelease.h) 1256 1257PHONY += headerdep 1258headerdep: 1259 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1260 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1261 1262# --------------------------------------------------------------------------- 1263# Kernel headers 1264 1265#Default location for installed headers 1266export INSTALL_HDR_PATH = $(objtree)/usr 1267 1268quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1269 cmd_headers_install = \ 1270 mkdir -p $(INSTALL_HDR_PATH); \ 1271 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1272 usr/include $(INSTALL_HDR_PATH) 1273 1274PHONY += headers_install 1275headers_install: headers 1276 $(call cmd,headers_install) 1277 1278PHONY += archheaders archscripts 1279 1280hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1281 1282PHONY += headers 1283headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1284 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1285 $(error Headers not exportable for the $(SRCARCH) architecture)) 1286 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1287 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1288 1289ifdef CONFIG_HEADERS_INSTALL 1290prepare: headers 1291endif 1292 1293PHONY += scripts_unifdef 1294scripts_unifdef: scripts_basic 1295 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1296 1297# --------------------------------------------------------------------------- 1298# Install 1299 1300# Many distributions have the custom install script, /sbin/installkernel. 1301# If DKMS is installed, 'make install' will eventually recuses back 1302# to the this Makefile to build and install external modules. 1303# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1304 1305install: sub_make_done := 1306 1307# --------------------------------------------------------------------------- 1308# Tools 1309 1310ifdef CONFIG_STACK_VALIDATION 1311prepare: tools/objtool 1312endif 1313 1314ifdef CONFIG_BPF 1315ifdef CONFIG_DEBUG_INFO_BTF 1316prepare: tools/bpf/resolve_btfids 1317endif 1318endif 1319 1320PHONY += resolve_btfids_clean 1321 1322resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1323 1324# tools/bpf/resolve_btfids directory might not exist 1325# in output directory, skip its clean in that case 1326resolve_btfids_clean: 1327ifneq ($(wildcard $(resolve_btfids_O)),) 1328 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1329endif 1330 1331# Clear a bunch of variables before executing the submake 1332ifeq ($(quiet),silent_) 1333tools_silent=s 1334endif 1335 1336tools/: FORCE 1337 $(Q)mkdir -p $(objtree)/tools 1338 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1339 1340tools/%: FORCE 1341 $(Q)mkdir -p $(objtree)/tools 1342 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1343 1344# --------------------------------------------------------------------------- 1345# Kernel selftest 1346 1347PHONY += kselftest 1348kselftest: 1349 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1350 1351kselftest-%: FORCE 1352 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1353 1354PHONY += kselftest-merge 1355kselftest-merge: 1356 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1357 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1358 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1359 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1360 1361# --------------------------------------------------------------------------- 1362# Devicetree files 1363 1364ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1365dtstree := arch/$(SRCARCH)/boot/dts 1366endif 1367 1368ifneq ($(dtstree),) 1369 1370%.dtb: include/config/kernel.release scripts_dtc 1371 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1372 1373%.dtbo: include/config/kernel.release scripts_dtc 1374 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1375 1376PHONY += dtbs dtbs_install dtbs_check 1377dtbs: include/config/kernel.release scripts_dtc 1378 $(Q)$(MAKE) $(build)=$(dtstree) 1379 1380ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1381export CHECK_DTBS=y 1382dtbs: dt_binding_check 1383endif 1384 1385dtbs_check: dtbs 1386 1387dtbs_install: 1388 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1389 1390ifdef CONFIG_OF_EARLY_FLATTREE 1391all: dtbs 1392endif 1393 1394endif 1395 1396PHONY += scripts_dtc 1397scripts_dtc: scripts_basic 1398 $(Q)$(MAKE) $(build)=scripts/dtc 1399 1400ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1401export CHECK_DT_BINDING=y 1402endif 1403 1404PHONY += dt_binding_check 1405dt_binding_check: scripts_dtc 1406 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1407 1408# --------------------------------------------------------------------------- 1409# Modules 1410 1411ifdef CONFIG_MODULES 1412 1413# By default, build modules as well 1414 1415all: modules 1416 1417# When we're building modules with modversions, we need to consider 1418# the built-in objects during the descend as well, in order to 1419# make sure the checksums are up to date before we record them. 1420ifdef CONFIG_MODVERSIONS 1421 KBUILD_BUILTIN := 1 1422endif 1423 1424# Build modules 1425# 1426# A module can be listed more than once in obj-m resulting in 1427# duplicate lines in modules.order files. Those are removed 1428# using awk while concatenating to the final file. 1429 1430PHONY += modules 1431modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1432 1433cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1434 1435modules.order: $(subdir-modorder) FORCE 1436 $(call if_changed,modules_order) 1437 1438targets += modules.order 1439 1440# Target to prepare building external modules 1441PHONY += modules_prepare 1442modules_prepare: prepare 1443 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1444 1445export modules_sign_only := 1446 1447ifeq ($(CONFIG_MODULE_SIG),y) 1448PHONY += modules_sign 1449modules_sign: modules_install 1450 @: 1451 1452# modules_sign is a subset of modules_install. 1453# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1454ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1455modules_sign_only := y 1456endif 1457endif 1458 1459modinst_pre := 1460ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1461modinst_pre := __modinst_pre 1462endif 1463 1464modules_install: $(modinst_pre) 1465PHONY += __modinst_pre 1466__modinst_pre: 1467 @rm -rf $(MODLIB)/kernel 1468 @rm -f $(MODLIB)/source 1469 @mkdir -p $(MODLIB)/kernel 1470 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1471 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1472 rm -f $(MODLIB)/build ; \ 1473 ln -s $(CURDIR) $(MODLIB)/build ; \ 1474 fi 1475 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1476 @cp -f modules.builtin $(MODLIB)/ 1477 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1478 1479endif # CONFIG_MODULES 1480 1481### 1482# Cleaning is done on three levels. 1483# make clean Delete most generated files 1484# Leave enough to build external modules 1485# make mrproper Delete the current configuration, and all generated files 1486# make distclean Remove editor backup files, patch leftover files and the like 1487 1488# Directories & files removed with 'make clean' 1489CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1490 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1491 compile_commands.json .thinlto-cache 1492 1493# Directories & files removed with 'make mrproper' 1494MRPROPER_FILES += include/config include/generated \ 1495 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1496 debian snap tar-install \ 1497 .config .config.old .version \ 1498 Module.symvers \ 1499 certs/signing_key.pem \ 1500 certs/x509.genkey \ 1501 vmlinux-gdb.py \ 1502 *.spec 1503 1504# clean - Delete most, but leave enough to build external modules 1505# 1506clean: rm-files := $(CLEAN_FILES) 1507 1508PHONY += archclean vmlinuxclean 1509 1510vmlinuxclean: 1511 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1512 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1513 1514clean: archclean vmlinuxclean resolve_btfids_clean 1515 1516# mrproper - Delete all generated files, including .config 1517# 1518mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1519mrproper-dirs := $(addprefix _mrproper_,scripts) 1520 1521PHONY += $(mrproper-dirs) mrproper 1522$(mrproper-dirs): 1523 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1524 1525mrproper: clean $(mrproper-dirs) 1526 $(call cmd,rmfiles) 1527 1528# distclean 1529# 1530PHONY += distclean 1531 1532distclean: mrproper 1533 @find . $(RCS_FIND_IGNORE) \ 1534 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1535 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1536 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1537 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1538 -type f -print | xargs rm -f 1539 1540 1541# Packaging of the kernel to various formats 1542# --------------------------------------------------------------------------- 1543 1544%src-pkg: FORCE 1545 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1546%pkg: include/config/kernel.release FORCE 1547 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1548 1549# Brief documentation of the typical targets used 1550# --------------------------------------------------------------------------- 1551 1552boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1553boards := $(sort $(notdir $(boards))) 1554board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1555board-dirs := $(sort $(notdir $(board-dirs:/=))) 1556 1557PHONY += help 1558help: 1559 @echo 'Cleaning targets:' 1560 @echo ' clean - Remove most generated files but keep the config and' 1561 @echo ' enough build support to build external modules' 1562 @echo ' mrproper - Remove all generated files + config + various backup files' 1563 @echo ' distclean - mrproper + remove editor backup and patch files' 1564 @echo '' 1565 @echo 'Configuration targets:' 1566 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1567 @echo '' 1568 @echo 'Other generic targets:' 1569 @echo ' all - Build all targets marked with [*]' 1570 @echo '* vmlinux - Build the bare kernel' 1571 @echo '* modules - Build all modules' 1572 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1573 @echo ' dir/ - Build all files in dir and below' 1574 @echo ' dir/file.[ois] - Build specified target only' 1575 @echo ' dir/file.ll - Build the LLVM assembly file' 1576 @echo ' (requires compiler support for LLVM assembly generation)' 1577 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1578 @echo ' (requires a recent binutils and recent build (System.map))' 1579 @echo ' dir/file.ko - Build module including final link' 1580 @echo ' modules_prepare - Set up for building external modules' 1581 @echo ' tags/TAGS - Generate tags file for editors' 1582 @echo ' cscope - Generate cscope index' 1583 @echo ' gtags - Generate GNU GLOBAL index' 1584 @echo ' kernelrelease - Output the release version string (use with make -s)' 1585 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1586 @echo ' image_name - Output the image name (use with make -s)' 1587 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1588 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1589 echo '' 1590 @echo 'Static analysers:' 1591 @echo ' checkstack - Generate a list of stack hogs' 1592 @echo ' versioncheck - Sanity check on version.h usage' 1593 @echo ' includecheck - Check for duplicate included header files' 1594 @echo ' export_report - List the usages of all exported symbols' 1595 @echo ' headerdep - Detect inclusion cycles in headers' 1596 @echo ' coccicheck - Check with Coccinelle' 1597 @echo ' clang-analyzer - Check with clang static analyzer' 1598 @echo ' clang-tidy - Check with clang-tidy' 1599 @echo '' 1600 @echo 'Tools:' 1601 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1602 @echo '' 1603 @echo 'Kernel selftest:' 1604 @echo ' kselftest - Build and run kernel selftest' 1605 @echo ' Build, install, and boot kernel before' 1606 @echo ' running kselftest on it' 1607 @echo ' Run as root for full coverage' 1608 @echo ' kselftest-all - Build kernel selftest' 1609 @echo ' kselftest-install - Build and install kernel selftest' 1610 @echo ' kselftest-clean - Remove all generated kselftest files' 1611 @echo ' kselftest-merge - Merge all the config dependencies of' 1612 @echo ' kselftest to existing .config.' 1613 @echo '' 1614 @$(if $(dtstree), \ 1615 echo 'Devicetree:'; \ 1616 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1617 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1618 echo ' dt_binding_check - Validate device tree binding documents'; \ 1619 echo ' dtbs_check - Validate device tree source files';\ 1620 echo '') 1621 1622 @echo 'Userspace tools targets:' 1623 @echo ' use "make tools/help"' 1624 @echo ' or "cd tools; make help"' 1625 @echo '' 1626 @echo 'Kernel packaging:' 1627 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1628 @echo '' 1629 @echo 'Documentation targets:' 1630 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1631 @echo '' 1632 @echo 'Architecture specific targets ($(SRCARCH)):' 1633 @$(or $(archhelp),\ 1634 echo ' No architecture specific help defined for $(SRCARCH)') 1635 @echo '' 1636 @$(if $(boards), \ 1637 $(foreach b, $(boards), \ 1638 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1639 echo '') 1640 @$(if $(board-dirs), \ 1641 $(foreach b, $(board-dirs), \ 1642 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1643 printf " %-16s - Show all of the above\\n" help-boards; \ 1644 echo '') 1645 1646 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1647 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1648 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1649 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1650 @echo ' (sparse by default)' 1651 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1652 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1653 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1654 @echo ' 1: warnings which may be relevant and do not occur too often' 1655 @echo ' 2: warnings which occur quite often but may still be relevant' 1656 @echo ' 3: more obscure warnings, can most likely be ignored' 1657 @echo ' Multiple levels can be combined with W=12 or W=123' 1658 @echo '' 1659 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1660 @echo 'For further info see the ./README file' 1661 1662 1663help-board-dirs := $(addprefix help-,$(board-dirs)) 1664 1665help-boards: $(help-board-dirs) 1666 1667boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1668 1669$(help-board-dirs): help-%: 1670 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1671 @$(if $(boards-per-dir), \ 1672 $(foreach b, $(boards-per-dir), \ 1673 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1674 echo '') 1675 1676 1677# Documentation targets 1678# --------------------------------------------------------------------------- 1679DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1680 linkcheckdocs dochelp refcheckdocs 1681PHONY += $(DOC_TARGETS) 1682$(DOC_TARGETS): 1683 $(Q)$(MAKE) $(build)=Documentation $@ 1684 1685# Misc 1686# --------------------------------------------------------------------------- 1687 1688PHONY += scripts_gdb 1689scripts_gdb: prepare0 1690 $(Q)$(MAKE) $(build)=scripts/gdb 1691 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1692 1693ifdef CONFIG_GDB_SCRIPTS 1694all: scripts_gdb 1695endif 1696 1697else # KBUILD_EXTMOD 1698 1699### 1700# External module support. 1701# When building external modules the kernel used as basis is considered 1702# read-only, and no consistency checks are made and the make 1703# system is not used on the basis kernel. If updates are required 1704# in the basis kernel ordinary make commands (without M=...) must be used. 1705 1706# We are always building only modules. 1707KBUILD_BUILTIN := 1708KBUILD_MODULES := 1 1709 1710build-dirs := $(KBUILD_EXTMOD) 1711$(MODORDER): descend 1712 @: 1713 1714compile_commands.json: $(extmod_prefix)compile_commands.json 1715PHONY += compile_commands.json 1716 1717clean-dirs := $(KBUILD_EXTMOD) 1718clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1719 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1720 1721PHONY += prepare 1722# now expand this into a simple variable to reduce the cost of shell evaluations 1723prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1724prepare: 1725 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1726 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1727 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1728 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1729 fi 1730 1731PHONY += help 1732help: 1733 @echo ' Building external modules.' 1734 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1735 @echo '' 1736 @echo ' modules - default target, build the module(s)' 1737 @echo ' modules_install - install the module' 1738 @echo ' clean - remove generated files in module directory only' 1739 @echo '' 1740 1741# no-op for external module builds 1742PHONY += modules_prepare 1743 1744endif # KBUILD_EXTMOD 1745 1746# --------------------------------------------------------------------------- 1747# Modules 1748 1749PHONY += modules modules_install 1750 1751ifdef CONFIG_MODULES 1752 1753modules: modules_check 1754 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1755 1756PHONY += modules_check 1757modules_check: $(MODORDER) 1758 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1759 1760quiet_cmd_depmod = DEPMOD $(MODLIB) 1761 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1762 $(KERNELRELEASE) 1763 1764modules_install: 1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1766 $(call cmd,depmod) 1767 1768else # CONFIG_MODULES 1769 1770# Modules not configured 1771# --------------------------------------------------------------------------- 1772 1773modules modules_install: 1774 @echo >&2 '***' 1775 @echo >&2 '*** The present kernel configuration has modules disabled.' 1776 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1777 @echo >&2 '*** to enable CONFIG_MODULES.' 1778 @echo >&2 '***' 1779 @exit 1 1780 1781endif # CONFIG_MODULES 1782 1783# Single targets 1784# --------------------------------------------------------------------------- 1785# To build individual files in subdirectories, you can do like this: 1786# 1787# make foo/bar/baz.s 1788# 1789# The supported suffixes for single-target are listed in 'single-targets' 1790# 1791# To build only under specific subdirectories, you can do like this: 1792# 1793# make foo/bar/baz/ 1794 1795ifdef single-build 1796 1797# .ko is special because modpost is needed 1798single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1799single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1800 1801$(single-ko): single_modpost 1802 @: 1803$(single-no-ko): descend 1804 @: 1805 1806ifeq ($(KBUILD_EXTMOD),) 1807# For the single build of in-tree modules, use a temporary file to avoid 1808# the situation of modules_install installing an invalid modules.order. 1809MODORDER := .modules.tmp 1810endif 1811 1812PHONY += single_modpost 1813single_modpost: $(single-no-ko) modules_prepare 1814 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1815 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1816 1817KBUILD_MODULES := 1 1818 1819export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1820 1821# trim unrelated directories 1822build-dirs := $(foreach d, $(build-dirs), \ 1823 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1824 1825endif 1826 1827ifndef CONFIG_MODULES 1828KBUILD_MODULES := 1829endif 1830 1831# Handle descending into subdirectories listed in $(build-dirs) 1832# Preset locale variables to speed up the build process. Limit locale 1833# tweaks to this spot to avoid wrong language settings when running 1834# make menuconfig etc. 1835# Error messages still appears in the original language 1836PHONY += descend $(build-dirs) 1837descend: $(build-dirs) 1838$(build-dirs): prepare 1839 $(Q)$(MAKE) $(build)=$@ \ 1840 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1841 need-builtin=1 need-modorder=1 1842 1843clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1844PHONY += $(clean-dirs) clean 1845$(clean-dirs): 1846 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1847 1848clean: $(clean-dirs) 1849 $(call cmd,rmfiles) 1850 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1851 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1852 -o -name '*.ko.*' \ 1853 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1854 -o -name '*.dwo' -o -name '*.lst' \ 1855 -o -name '*.su' -o -name '*.mod' \ 1856 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1857 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1858 -o -name '*.asn1.[ch]' \ 1859 -o -name '*.symtypes' -o -name 'modules.order' \ 1860 -o -name '.tmp_*.o.*' \ 1861 -o -name '*.c.[012]*.*' \ 1862 -o -name '*.ll' \ 1863 -o -name '*.gcno' \ 1864 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1865 1866# Generate tags for editors 1867# --------------------------------------------------------------------------- 1868quiet_cmd_tags = GEN $@ 1869 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1870 1871tags TAGS cscope gtags: FORCE 1872 $(call cmd,tags) 1873 1874# Script to generate missing namespace dependencies 1875# --------------------------------------------------------------------------- 1876 1877PHONY += nsdeps 1878nsdeps: export KBUILD_NSDEPS=1 1879nsdeps: modules 1880 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1881 1882# Clang Tooling 1883# --------------------------------------------------------------------------- 1884 1885quiet_cmd_gen_compile_commands = GEN $@ 1886 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1887 1888$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1889 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1890 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1891 $(call if_changed,gen_compile_commands) 1892 1893targets += $(extmod_prefix)compile_commands.json 1894 1895PHONY += clang-tidy clang-analyzer 1896 1897ifdef CONFIG_CC_IS_CLANG 1898quiet_cmd_clang_tools = CHECK $< 1899 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1900 1901clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1902 $(call cmd,clang_tools) 1903else 1904clang-tidy clang-analyzer: 1905 @echo "$@ requires CC=clang" >&2 1906 @false 1907endif 1908 1909# Scripts to check various things for consistency 1910# --------------------------------------------------------------------------- 1911 1912PHONY += includecheck versioncheck coccicheck export_report 1913 1914includecheck: 1915 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1916 -name '*.[hcS]' -type f -print | sort \ 1917 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1918 1919versioncheck: 1920 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1921 -name '*.[hcS]' -type f -print | sort \ 1922 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1923 1924coccicheck: 1925 $(Q)$(BASH) $(srctree)/scripts/$@ 1926 1927export_report: 1928 $(PERL) $(srctree)/scripts/export_report.pl 1929 1930PHONY += checkstack kernelrelease kernelversion image_name 1931 1932# UML needs a little special treatment here. It wants to use the host 1933# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1934# else wants $(ARCH), including people doing cross-builds, which means 1935# that $(SUBARCH) doesn't work here. 1936ifeq ($(ARCH), um) 1937CHECKSTACK_ARCH := $(SUBARCH) 1938else 1939CHECKSTACK_ARCH := $(ARCH) 1940endif 1941checkstack: 1942 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1943 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1944 1945kernelrelease: 1946 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1947 1948kernelversion: 1949 @echo $(KERNELVERSION) 1950 1951image_name: 1952 @echo $(KBUILD_IMAGE) 1953 1954quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1955 cmd_rmfiles = rm -rf $(rm-files) 1956 1957# read saved command lines for existing targets 1958existing-targets := $(wildcard $(sort $(targets))) 1959 1960-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1961 1962endif # config-build 1963endif # mixed-build 1964endif # need-sub-make 1965 1966PHONY += FORCE 1967FORCE: 1968 1969# Declare the contents of the PHONY variable as phony. We keep that 1970# information in a variable so we can use it in if_changed and friends. 1971.PHONY: $(PHONY) 1972