1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 16 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Trick or Treat 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),) 427HOSTCC = clang 428HOSTCXX = clang++ 429else 430HOSTCC = gcc 431HOSTCXX = g++ 432endif 433 434export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 435 -O2 -fomit-frame-pointer -std=gnu89 436export KBUILD_USERLDFLAGS := 437 438KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 439KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 440KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 441KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 442 443# Make variables (CC, etc...) 444CPP = $(CC) -E 445ifneq ($(LLVM),) 446CC = clang 447LD = ld.lld 448AR = llvm-ar 449NM = llvm-nm 450OBJCOPY = llvm-objcopy 451OBJDUMP = llvm-objdump 452READELF = llvm-readelf 453STRIP = llvm-strip 454else 455CC = $(CROSS_COMPILE)gcc 456LD = $(CROSS_COMPILE)ld 457AR = $(CROSS_COMPILE)ar 458NM = $(CROSS_COMPILE)nm 459OBJCOPY = $(CROSS_COMPILE)objcopy 460OBJDUMP = $(CROSS_COMPILE)objdump 461READELF = $(CROSS_COMPILE)readelf 462STRIP = $(CROSS_COMPILE)strip 463endif 464PAHOLE = pahole 465RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 466LEX = flex 467YACC = bison 468AWK = awk 469INSTALLKERNEL := installkernel 470DEPMOD = depmod 471PERL = perl 472PYTHON3 = python3 473CHECK = sparse 474BASH = bash 475KGZIP = gzip 476KBZIP2 = bzip2 477KLZOP = lzop 478LZMA = lzma 479LZ4 = lz4c 480XZ = xz 481ZSTD = zstd 482 483PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 484 485CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 486 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 487NOSTDINC_FLAGS := 488CFLAGS_MODULE = 489AFLAGS_MODULE = 490LDFLAGS_MODULE = 491CFLAGS_KERNEL = 492AFLAGS_KERNEL = 493LDFLAGS_vmlinux = 494 495# Use USERINCLUDE when you must reference the UAPI directories only. 496USERINCLUDE := \ 497 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 498 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 499 -I$(srctree)/include/uapi \ 500 -I$(objtree)/include/generated/uapi \ 501 -include $(srctree)/include/linux/compiler-version.h \ 502 -include $(srctree)/include/linux/kconfig.h 503 504# Use LINUXINCLUDE when you must reference the include/ directory. 505# Needed to be compatible with the O= option 506LINUXINCLUDE := \ 507 -I$(srctree)/arch/$(SRCARCH)/include \ 508 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 509 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 510 -I$(objtree)/include \ 511 $(USERINCLUDE) 512 513KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 514KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 515 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 516 -Werror=implicit-function-declaration -Werror=implicit-int \ 517 -Werror=return-type -Wno-format-security \ 518 -std=gnu89 519KBUILD_CPPFLAGS := -D__KERNEL__ 520KBUILD_AFLAGS_KERNEL := 521KBUILD_CFLAGS_KERNEL := 522KBUILD_AFLAGS_MODULE := -DMODULE 523KBUILD_CFLAGS_MODULE := -DMODULE 524KBUILD_LDFLAGS_MODULE := 525KBUILD_LDFLAGS := 526CLANG_FLAGS := 527 528export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 529export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 530export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 531export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 532export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 533 534export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 535export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 536export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 537export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 538export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 539export PAHOLE_FLAGS 540 541# Files to ignore in find ... statements 542 543export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 544 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 545 -prune -o 546export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 547 --exclude CVS --exclude .pc --exclude .hg --exclude .git 548 549# =========================================================================== 550# Rules shared between *config targets and build targets 551 552# Basic helpers built in scripts/basic/ 553PHONY += scripts_basic 554scripts_basic: 555 $(Q)$(MAKE) $(build)=scripts/basic 556 557PHONY += outputmakefile 558ifdef building_out_of_srctree 559# Before starting out-of-tree build, make sure the source tree is clean. 560# outputmakefile generates a Makefile in the output directory, if using a 561# separate output directory. This allows convenient use of make in the 562# output directory. 563# At the same time when output Makefile generated, generate .gitignore to 564# ignore whole output directory 565 566quiet_cmd_makefile = GEN Makefile 567 cmd_makefile = { \ 568 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 569 echo "include $(srctree)/Makefile"; \ 570 } > Makefile 571 572outputmakefile: 573 $(Q)if [ -f $(srctree)/.config -o \ 574 -d $(srctree)/include/config -o \ 575 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 576 echo >&2 "***"; \ 577 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 578 echo >&2 "*** in $(abs_srctree)";\ 579 echo >&2 "***"; \ 580 false; \ 581 fi 582 $(Q)ln -fsn $(srctree) source 583 $(call cmd,makefile) 584 $(Q)test -e .gitignore || \ 585 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 586endif 587 588# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 589# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 590# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 591# and from include/config/auto.conf.cmd to detect the compiler upgrade. 592CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 593 594ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 595include $(srctree)/scripts/Makefile.clang 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 ($(KBUILD_EXTMOD),) 665# Objects we will link into vmlinux / subdirs we need to visit 666core-y := init/ usr/ arch/$(SRCARCH)/ 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 681ifdef CONFIG_CC_IS_GCC 682CFLAGS_GCOV += -fno-tree-loop-im 683endif 684export CFLAGS_GCOV 685 686# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 687ifdef CONFIG_FUNCTION_TRACER 688 CC_FLAGS_FTRACE := -pg 689endif 690 691ifdef CONFIG_CC_IS_GCC 692RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 693RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 694endif 695ifdef CONFIG_CC_IS_CLANG 696RETPOLINE_CFLAGS := -mretpoline-external-thunk 697RETPOLINE_VDSO_CFLAGS := -mretpoline 698endif 699export RETPOLINE_CFLAGS 700export RETPOLINE_VDSO_CFLAGS 701 702include $(srctree)/arch/$(SRCARCH)/Makefile 703 704ifdef need-config 705ifdef may-sync-config 706# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 707# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 708# because some architectures define CROSS_COMPILE there. 709include include/config/auto.conf.cmd 710 711$(KCONFIG_CONFIG): 712 @echo >&2 '***' 713 @echo >&2 '*** Configuration file "$@" not found!' 714 @echo >&2 '***' 715 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 716 @echo >&2 '*** "make menuconfig" or "make xconfig").' 717 @echo >&2 '***' 718 @/bin/false 719 720# The actual configuration files used during the build are stored in 721# include/generated/ and include/config/. Update them if .config is newer than 722# include/config/auto.conf (which mirrors .config). 723# 724# This exploits the 'multi-target pattern rule' trick. 725# The syncconfig should be executed only once to make all the targets. 726# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 727# 728# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 729# so you cannot notice that Kconfig is waiting for the user input. 730%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 731 $(Q)$(kecho) " SYNC $@" 732 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 733else # !may-sync-config 734# External modules and some install targets need include/generated/autoconf.h 735# and include/config/auto.conf but do not care if they are up-to-date. 736# Use auto.conf to trigger the test 737PHONY += include/config/auto.conf 738 739include/config/auto.conf: 740 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 741 echo >&2; \ 742 echo >&2 " ERROR: Kernel configuration is invalid."; \ 743 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 744 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 745 echo >&2 ; \ 746 /bin/false) 747 748endif # may-sync-config 749endif # need-config 750 751KBUILD_CFLAGS += -fno-delete-null-pointer-checks 752KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 753KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 754KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 755KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 756 757ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 758KBUILD_CFLAGS += -O2 759else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 760KBUILD_CFLAGS += -O3 761else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 762KBUILD_CFLAGS += -Os 763endif 764 765# Tell gcc to never replace conditional load with a non-conditional one 766ifdef CONFIG_CC_IS_GCC 767# gcc-10 renamed --param=allow-store-data-races=0 to 768# -fno-allow-store-data-races. 769KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 770KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 771endif 772 773ifdef CONFIG_READABLE_ASM 774# Disable optimizations that make assembler listings hard to read. 775# reorder blocks reorders the control in the function 776# ipa clone creates specialized cloned functions 777# partial inlining inlines only parts of functions 778KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 779endif 780 781ifneq ($(CONFIG_FRAME_WARN),0) 782KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 783endif 784 785stackp-flags-y := -fno-stack-protector 786stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 787stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 788 789KBUILD_CFLAGS += $(stackp-flags-y) 790 791KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 792KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 793 794ifdef CONFIG_CC_IS_CLANG 795KBUILD_CPPFLAGS += -Qunused-arguments 796# The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable. 797KBUILD_CFLAGS += -Wno-gnu 798# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 799# source of a reference will be _MergedGlobals and not on of the whitelisted names. 800# See modpost pattern 2 801KBUILD_CFLAGS += -mno-global-merge 802else 803 804# gcc inanely warns about local variables called 'main' 805KBUILD_CFLAGS += -Wno-main 806endif 807 808# These warnings generated too much noise in a regular build. 809# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 810KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 811KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 812 813ifdef CONFIG_FRAME_POINTER 814KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 815else 816# Some targets (ARM with Thumb2, for example), can't be built with frame 817# pointers. For those, we don't have FUNCTION_TRACER automatically 818# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 819# incompatible with -fomit-frame-pointer with current GCC, so we don't use 820# -fomit-frame-pointer with FUNCTION_TRACER. 821ifndef CONFIG_FUNCTION_TRACER 822KBUILD_CFLAGS += -fomit-frame-pointer 823endif 824endif 825 826# Initialize all stack variables with a 0xAA pattern. 827ifdef CONFIG_INIT_STACK_ALL_PATTERN 828KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 829endif 830 831# Initialize all stack variables with a zero value. 832ifdef CONFIG_INIT_STACK_ALL_ZERO 833KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 834ifdef CONFIG_CC_IS_CLANG 835# https://bugs.llvm.org/show_bug.cgi?id=45497 836KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 837endif 838endif 839 840# While VLAs have been removed, GCC produces unreachable stack probes 841# for the randomize_kstack_offset feature. Disable it for all compilers. 842KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 843 844# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 845ifdef CONFIG_ZERO_CALL_USED_REGS 846KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 847endif 848 849ifdef CONFIG_FUNCTION_TRACER 850ifdef CONFIG_FTRACE_MCOUNT_USE_CC 851 CC_FLAGS_FTRACE += -mrecord-mcount 852 ifdef CONFIG_HAVE_NOP_MCOUNT 853 ifeq ($(call cc-option-yn, -mnop-mcount),y) 854 CC_FLAGS_FTRACE += -mnop-mcount 855 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 856 endif 857 endif 858endif 859ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 860 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 861endif 862ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 863 ifdef CONFIG_HAVE_C_RECORDMCOUNT 864 BUILD_C_RECORDMCOUNT := y 865 export BUILD_C_RECORDMCOUNT 866 endif 867endif 868ifdef CONFIG_HAVE_FENTRY 869 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 870 ifeq ($(call cc-option-yn, -mfentry),y) 871 CC_FLAGS_FTRACE += -mfentry 872 CC_FLAGS_USING += -DCC_USING_FENTRY 873 endif 874endif 875export CC_FLAGS_FTRACE 876KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 877KBUILD_AFLAGS += $(CC_FLAGS_USING) 878endif 879 880# We trigger additional mismatches with less inlining 881ifdef CONFIG_DEBUG_SECTION_MISMATCH 882KBUILD_CFLAGS += -fno-inline-functions-called-once 883endif 884 885ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 886KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 887LDFLAGS_vmlinux += --gc-sections 888endif 889 890ifdef CONFIG_SHADOW_CALL_STACK 891CC_FLAGS_SCS := -fsanitize=shadow-call-stack 892KBUILD_CFLAGS += $(CC_FLAGS_SCS) 893export CC_FLAGS_SCS 894endif 895 896ifdef CONFIG_LTO_CLANG 897ifdef CONFIG_LTO_CLANG_THIN 898CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 899KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 900else 901CC_FLAGS_LTO := -flto 902endif 903CC_FLAGS_LTO += -fvisibility=hidden 904 905# Limit inlining across translation units to reduce binary size 906KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 907 908# Check for frame size exceeding threshold during prolog/epilog insertion 909# when using lld < 13.0.0. 910ifneq ($(CONFIG_FRAME_WARN),0) 911ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 912KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 913endif 914endif 915endif 916 917ifdef CONFIG_LTO 918KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 919KBUILD_AFLAGS += -fno-lto 920export CC_FLAGS_LTO 921endif 922 923ifdef CONFIG_CFI_CLANG 924CC_FLAGS_CFI := -fsanitize=cfi \ 925 -fsanitize-cfi-cross-dso \ 926 -fno-sanitize-cfi-canonical-jump-tables \ 927 -fno-sanitize-trap=cfi \ 928 -fno-sanitize-blacklist 929 930ifdef CONFIG_CFI_PERMISSIVE 931CC_FLAGS_CFI += -fsanitize-recover=cfi 932endif 933 934# If LTO flags are filtered out, we must also filter out CFI. 935CC_FLAGS_LTO += $(CC_FLAGS_CFI) 936KBUILD_CFLAGS += $(CC_FLAGS_CFI) 937export CC_FLAGS_CFI 938endif 939 940ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 941KBUILD_CFLAGS += -falign-functions=64 942endif 943 944# arch Makefile may override CC so keep this after arch Makefile is included 945NOSTDINC_FLAGS += -nostdinc 946 947# warn about C99 declaration after statement 948KBUILD_CFLAGS += -Wdeclaration-after-statement 949 950# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 951KBUILD_CFLAGS += -Wvla 952 953# disable pointer signed / unsigned warnings in gcc 4.0 954KBUILD_CFLAGS += -Wno-pointer-sign 955 956# In order to make sure new function cast mismatches are not introduced 957# in the kernel (to avoid tripping CFI checking), the kernel should be 958# globally built with -Wcast-function-type. 959KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 960 961# disable stringop warnings in gcc 8+ 962KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 963 964# We'll want to enable this eventually, but it's not going away for 5.7 at least 965KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 966KBUILD_CFLAGS += -Wno-array-bounds 967KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 968 969# Another good warning that we'll want to enable eventually 970KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 971 972# Enabled with W=2, disabled by default as noisy 973ifdef CONFIG_CC_IS_GCC 974KBUILD_CFLAGS += -Wno-maybe-uninitialized 975endif 976 977ifdef CONFIG_CC_IS_GCC 978# The allocators already balk at large sizes, so silence the compiler 979# warnings for bounds checks involving those possible values. While 980# -Wno-alloc-size-larger-than would normally be used here, earlier versions 981# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 982# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 983# doesn't work (as it is documented to), silently resolving to "0" prior to 984# version 9.1 (and producing an error more recently). Numeric values larger 985# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 986# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 987# choice, we must perform a versioned check to disable this warning. 988# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 989KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 990endif 991 992# disable invalid "can't wrap" optimizations for signed / pointers 993KBUILD_CFLAGS += -fno-strict-overflow 994 995# Make sure -fstack-check isn't enabled (like gentoo apparently did) 996KBUILD_CFLAGS += -fno-stack-check 997 998# conserve stack if available 999ifdef CONFIG_CC_IS_GCC 1000KBUILD_CFLAGS += -fconserve-stack 1001endif 1002 1003# Prohibit date/time macros, which would make the build non-deterministic 1004KBUILD_CFLAGS += -Werror=date-time 1005 1006# enforce correct pointer usage 1007KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1008 1009# Require designated initializers for all marked structures 1010KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1011 1012# change __FILE__ to the relative path from the srctree 1013KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1014 1015# include additional Makefiles when needed 1016include-y := scripts/Makefile.extrawarn 1017include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1018include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1019include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1020include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1021include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1022include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1023 1024include $(addprefix $(srctree)/, $(include-y)) 1025 1026# scripts/Makefile.gcc-plugins is intentionally included last. 1027# Do not add $(call cc-option,...) below this line. When you build the kernel 1028# from the clean source tree, the GCC plugins do not exist at this point. 1029 1030# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1031KBUILD_CPPFLAGS += $(KCPPFLAGS) 1032KBUILD_AFLAGS += $(KAFLAGS) 1033KBUILD_CFLAGS += $(KCFLAGS) 1034 1035KBUILD_LDFLAGS_MODULE += --build-id=sha1 1036LDFLAGS_vmlinux += --build-id=sha1 1037 1038ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1039LDFLAGS_vmlinux += $(call ld-option, -X,) 1040endif 1041 1042ifeq ($(CONFIG_RELR),y) 1043LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1044endif 1045 1046# We never want expected sections to be placed heuristically by the 1047# linker. All sections should be explicitly named in the linker script. 1048ifdef CONFIG_LD_ORPHAN_WARN 1049LDFLAGS_vmlinux += --orphan-handling=warn 1050endif 1051 1052# Align the bit size of userspace programs with the kernel 1053KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1054KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1055 1056# make the checker run with the right architecture 1057CHECKFLAGS += --arch=$(ARCH) 1058 1059# insure the checker run with the right endianness 1060CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1061 1062# the checker needs the correct machine size 1063CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1064 1065# Default kernel image to build when no specific target is given. 1066# KBUILD_IMAGE may be overruled on the command line or 1067# set in the environment 1068# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1069# this default value 1070export KBUILD_IMAGE ?= vmlinux 1071 1072# 1073# INSTALL_PATH specifies where to place the updated kernel and system map 1074# images. Default is /boot, but you can set it to other values 1075export INSTALL_PATH ?= /boot 1076 1077# 1078# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1079# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1080# an argument if needed. Otherwise it defaults to the kernel install path 1081# 1082export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1083 1084# 1085# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1086# relocations required by build roots. This is not defined in the 1087# makefile but the argument can be passed to make if needed. 1088# 1089 1090MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1091export MODLIB 1092 1093PHONY += prepare0 1094 1095export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1096export MODORDER := $(extmod_prefix)modules.order 1097export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1098 1099ifeq ($(KBUILD_EXTMOD),) 1100core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1101core-$(CONFIG_BLOCK) += block/ 1102 1103vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1104 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1105 $(libs-y) $(libs-m))) 1106 1107vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1108 $(patsubst %/,%,$(filter %/, $(core-) \ 1109 $(drivers-) $(libs-)))) 1110 1111subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1112 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1113 $(drivers-y) $(drivers-m))) 1114 1115build-dirs := $(vmlinux-dirs) 1116clean-dirs := $(vmlinux-alldirs) 1117 1118# Externally visible symbols (used by link-vmlinux.sh) 1119KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1120KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1121ifdef CONFIG_MODULES 1122KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1123KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1124else 1125KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1126endif 1127KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1128 1129export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1130export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1131# used by scripts/Makefile.package 1132export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1133 1134vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1135 1136# Recurse until adjust_autoksyms.sh is satisfied 1137PHONY += autoksyms_recursive 1138ifdef CONFIG_TRIM_UNUSED_KSYMS 1139# For the kernel to actually contain only the needed exported symbols, 1140# we have to build modules as well to determine what those symbols are. 1141# (this can be evaluated only once include/config/auto.conf has been included) 1142KBUILD_MODULES := 1 1143 1144autoksyms_recursive: descend modules.order 1145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1146 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1147endif 1148 1149autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1150 1151quiet_cmd_autoksyms_h = GEN $@ 1152 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1153 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1154 1155$(autoksyms_h): 1156 $(call cmd,autoksyms_h) 1157 1158ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1159 1160# Final link of vmlinux with optional arch pass after final link 1161cmd_link-vmlinux = \ 1162 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1163 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1164 1165vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1166 +$(call if_changed_dep,link-vmlinux) 1167 1168targets := vmlinux 1169 1170# The actual objects are generated when descending, 1171# make sure no implicit rule kicks in 1172$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1173 1174filechk_kernel.release = \ 1175 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1176 1177# Store (new) KERNELRELEASE string in include/config/kernel.release 1178include/config/kernel.release: FORCE 1179 $(call filechk,kernel.release) 1180 1181# Additional helpers built in scripts/ 1182# Carefully list dependencies so we do not try to build scripts twice 1183# in parallel 1184PHONY += scripts 1185scripts: scripts_basic scripts_dtc 1186 $(Q)$(MAKE) $(build)=$(@) 1187 1188# Things we need to do before we recursively start building the kernel 1189# or the modules are listed in "prepare". 1190# A multi level approach is used. prepareN is processed before prepareN-1. 1191# archprepare is used in arch Makefiles and when processed asm symlink, 1192# version.h and scripts_basic is processed / created. 1193 1194PHONY += prepare archprepare 1195 1196archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1197 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1198 include/generated/autoconf.h remove-stale-files 1199 1200prepare0: archprepare 1201 $(Q)$(MAKE) $(build)=scripts/mod 1202 $(Q)$(MAKE) $(build)=. 1203 1204# All the preparing.. 1205prepare: prepare0 1206 1207PHONY += remove-stale-files 1208remove-stale-files: 1209 $(Q)$(srctree)/scripts/remove-stale-files 1210 1211# Support for using generic headers in asm-generic 1212asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1213 1214PHONY += asm-generic uapi-asm-generic 1215asm-generic: uapi-asm-generic 1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1217 generic=include/asm-generic 1218uapi-asm-generic: 1219 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1220 generic=include/uapi/asm-generic 1221 1222# Generate some files 1223# --------------------------------------------------------------------------- 1224 1225# KERNELRELEASE can change from a few different places, meaning version.h 1226# needs to be updated, so this check is forced on all builds 1227 1228uts_len := 64 1229define filechk_utsrelease.h 1230 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1231 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1232 exit 1; \ 1233 fi; \ 1234 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1235endef 1236 1237define filechk_version.h 1238 if [ $(SUBLEVEL) -gt 255 ]; then \ 1239 echo \#define LINUX_VERSION_CODE $(shell \ 1240 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1241 else \ 1242 echo \#define LINUX_VERSION_CODE $(shell \ 1243 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1244 fi; \ 1245 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1246 ((c) > 255 ? 255 : (c)))'; \ 1247 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1248 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1249 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1250endef 1251 1252$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1253$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1254$(version_h): FORCE 1255 $(call filechk,version.h) 1256 1257include/generated/utsrelease.h: include/config/kernel.release FORCE 1258 $(call filechk,utsrelease.h) 1259 1260PHONY += headerdep 1261headerdep: 1262 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1263 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1264 1265# --------------------------------------------------------------------------- 1266# Kernel headers 1267 1268#Default location for installed headers 1269export INSTALL_HDR_PATH = $(objtree)/usr 1270 1271quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1272 cmd_headers_install = \ 1273 mkdir -p $(INSTALL_HDR_PATH); \ 1274 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1275 usr/include $(INSTALL_HDR_PATH) 1276 1277PHONY += headers_install 1278headers_install: headers 1279 $(call cmd,headers_install) 1280 1281PHONY += archheaders archscripts 1282 1283hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1284 1285PHONY += headers 1286headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1287 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1288 $(error Headers not exportable for the $(SRCARCH) architecture)) 1289 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1290 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1291 1292# Deprecated. It is no-op now. 1293PHONY += headers_check 1294headers_check: 1295 @echo >&2 "=================== WARNING ===================" 1296 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1297 @echo >&2 "and will be removed after Linux 5.15 release." 1298 @echo >&2 "Please remove headers_check from your scripts." 1299 @echo >&2 "===============================================" 1300 1301ifdef CONFIG_HEADERS_INSTALL 1302prepare: headers 1303endif 1304 1305PHONY += scripts_unifdef 1306scripts_unifdef: scripts_basic 1307 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1308 1309# --------------------------------------------------------------------------- 1310# Install 1311 1312# Many distributions have the custom install script, /sbin/installkernel. 1313# If DKMS is installed, 'make install' will eventually recuses back 1314# to the this Makefile to build and install external modules. 1315# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1316 1317install: sub_make_done := 1318 1319# --------------------------------------------------------------------------- 1320# Tools 1321 1322ifdef CONFIG_STACK_VALIDATION 1323prepare: tools/objtool 1324endif 1325 1326ifdef CONFIG_BPF 1327ifdef CONFIG_DEBUG_INFO_BTF 1328prepare: tools/bpf/resolve_btfids 1329endif 1330endif 1331 1332PHONY += resolve_btfids_clean 1333 1334resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1335 1336# tools/bpf/resolve_btfids directory might not exist 1337# in output directory, skip its clean in that case 1338resolve_btfids_clean: 1339ifneq ($(wildcard $(resolve_btfids_O)),) 1340 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1341endif 1342 1343# Clear a bunch of variables before executing the submake 1344ifeq ($(quiet),silent_) 1345tools_silent=s 1346endif 1347 1348tools/: FORCE 1349 $(Q)mkdir -p $(objtree)/tools 1350 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1351 1352tools/%: FORCE 1353 $(Q)mkdir -p $(objtree)/tools 1354 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1355 1356# --------------------------------------------------------------------------- 1357# Kernel selftest 1358 1359PHONY += kselftest 1360kselftest: 1361 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1362 1363kselftest-%: FORCE 1364 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1365 1366PHONY += kselftest-merge 1367kselftest-merge: 1368 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1369 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1370 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1371 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1372 1373# --------------------------------------------------------------------------- 1374# Devicetree files 1375 1376ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1377dtstree := arch/$(SRCARCH)/boot/dts 1378endif 1379 1380ifneq ($(dtstree),) 1381 1382%.dtb: dt_binding_check include/config/kernel.release scripts_dtc 1383 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ $(dtstree)/$*.dt.yaml 1384 1385%.dtbo: dt_binding_check include/config/kernel.release scripts_dtc 1386 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ $(dtstree)/$*.dt.yaml 1387 1388PHONY += dtbs dtbs_install dtbs_check 1389dtbs: include/config/kernel.release scripts_dtc 1390 $(Q)$(MAKE) $(build)=$(dtstree) 1391 1392ifneq ($(filter dtbs_check %.dtb %.dtbo, $(MAKECMDGOALS)),) 1393export CHECK_DTBS=y 1394dtbs: dt_binding_check 1395endif 1396 1397dtbs_check: dtbs 1398 1399dtbs_install: 1400 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1401 1402ifdef CONFIG_OF_EARLY_FLATTREE 1403all: dtbs 1404endif 1405 1406endif 1407 1408PHONY += scripts_dtc 1409scripts_dtc: scripts_basic 1410 $(Q)$(MAKE) $(build)=scripts/dtc 1411 1412ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1413export CHECK_DT_BINDING=y 1414endif 1415 1416PHONY += dt_binding_check 1417dt_binding_check: scripts_dtc 1418 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1419 1420# --------------------------------------------------------------------------- 1421# Modules 1422 1423ifdef CONFIG_MODULES 1424 1425# By default, build modules as well 1426 1427all: modules 1428 1429# When we're building modules with modversions, we need to consider 1430# the built-in objects during the descend as well, in order to 1431# make sure the checksums are up to date before we record them. 1432ifdef CONFIG_MODVERSIONS 1433 KBUILD_BUILTIN := 1 1434endif 1435 1436# Build modules 1437# 1438# A module can be listed more than once in obj-m resulting in 1439# duplicate lines in modules.order files. Those are removed 1440# using awk while concatenating to the final file. 1441 1442PHONY += modules 1443modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1444 1445cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1446 1447modules.order: $(subdir-modorder) FORCE 1448 $(call if_changed,modules_order) 1449 1450targets += modules.order 1451 1452# Target to prepare building external modules 1453PHONY += modules_prepare 1454modules_prepare: prepare 1455 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1456 1457export modules_sign_only := 1458 1459ifeq ($(CONFIG_MODULE_SIG),y) 1460PHONY += modules_sign 1461modules_sign: modules_install 1462 @: 1463 1464# modules_sign is a subset of modules_install. 1465# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1466ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1467modules_sign_only := y 1468endif 1469endif 1470 1471modinst_pre := 1472ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1473modinst_pre := __modinst_pre 1474endif 1475 1476modules_install: $(modinst_pre) 1477PHONY += __modinst_pre 1478__modinst_pre: 1479 @rm -rf $(MODLIB)/kernel 1480 @rm -f $(MODLIB)/source 1481 @mkdir -p $(MODLIB)/kernel 1482 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1483 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1484 rm -f $(MODLIB)/build ; \ 1485 ln -s $(CURDIR) $(MODLIB)/build ; \ 1486 fi 1487 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1488 @cp -f modules.builtin $(MODLIB)/ 1489 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1490 1491endif # CONFIG_MODULES 1492 1493### 1494# Cleaning is done on three levels. 1495# make clean Delete most generated files 1496# Leave enough to build external modules 1497# make mrproper Delete the current configuration, and all generated files 1498# make distclean Remove editor backup files, patch leftover files and the like 1499 1500# Directories & files removed with 'make clean' 1501CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1502 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1503 compile_commands.json .thinlto-cache 1504 1505# Directories & files removed with 'make mrproper' 1506MRPROPER_FILES += include/config include/generated \ 1507 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1508 debian snap tar-install \ 1509 .config .config.old .version \ 1510 Module.symvers \ 1511 certs/signing_key.pem certs/signing_key.x509 \ 1512 certs/x509.genkey \ 1513 vmlinux-gdb.py \ 1514 *.spec 1515 1516# clean - Delete most, but leave enough to build external modules 1517# 1518clean: rm-files := $(CLEAN_FILES) 1519 1520PHONY += archclean vmlinuxclean 1521 1522vmlinuxclean: 1523 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1524 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1525 1526clean: archclean vmlinuxclean resolve_btfids_clean 1527 1528# mrproper - Delete all generated files, including .config 1529# 1530mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1531mrproper-dirs := $(addprefix _mrproper_,scripts) 1532 1533PHONY += $(mrproper-dirs) mrproper 1534$(mrproper-dirs): 1535 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1536 1537mrproper: clean $(mrproper-dirs) 1538 $(call cmd,rmfiles) 1539 1540# distclean 1541# 1542PHONY += distclean 1543 1544distclean: mrproper 1545 @find . $(RCS_FIND_IGNORE) \ 1546 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1547 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1548 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1549 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1550 -type f -print | xargs rm -f 1551 1552 1553# Packaging of the kernel to various formats 1554# --------------------------------------------------------------------------- 1555 1556%src-pkg: FORCE 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1558%pkg: include/config/kernel.release FORCE 1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1560 1561# Brief documentation of the typical targets used 1562# --------------------------------------------------------------------------- 1563 1564boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1565boards := $(sort $(notdir $(boards))) 1566board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1567board-dirs := $(sort $(notdir $(board-dirs:/=))) 1568 1569PHONY += help 1570help: 1571 @echo 'Cleaning targets:' 1572 @echo ' clean - Remove most generated files but keep the config and' 1573 @echo ' enough build support to build external modules' 1574 @echo ' mrproper - Remove all generated files + config + various backup files' 1575 @echo ' distclean - mrproper + remove editor backup and patch files' 1576 @echo '' 1577 @echo 'Configuration targets:' 1578 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1579 @echo '' 1580 @echo 'Other generic targets:' 1581 @echo ' all - Build all targets marked with [*]' 1582 @echo '* vmlinux - Build the bare kernel' 1583 @echo '* modules - Build all modules' 1584 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1585 @echo ' dir/ - Build all files in dir and below' 1586 @echo ' dir/file.[ois] - Build specified target only' 1587 @echo ' dir/file.ll - Build the LLVM assembly file' 1588 @echo ' (requires compiler support for LLVM assembly generation)' 1589 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1590 @echo ' (requires a recent binutils and recent build (System.map))' 1591 @echo ' dir/file.ko - Build module including final link' 1592 @echo ' modules_prepare - Set up for building external modules' 1593 @echo ' tags/TAGS - Generate tags file for editors' 1594 @echo ' cscope - Generate cscope index' 1595 @echo ' gtags - Generate GNU GLOBAL index' 1596 @echo ' kernelrelease - Output the release version string (use with make -s)' 1597 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1598 @echo ' image_name - Output the image name (use with make -s)' 1599 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1600 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1601 echo '' 1602 @echo 'Static analysers:' 1603 @echo ' checkstack - Generate a list of stack hogs' 1604 @echo ' versioncheck - Sanity check on version.h usage' 1605 @echo ' includecheck - Check for duplicate included header files' 1606 @echo ' export_report - List the usages of all exported symbols' 1607 @echo ' headerdep - Detect inclusion cycles in headers' 1608 @echo ' coccicheck - Check with Coccinelle' 1609 @echo ' clang-analyzer - Check with clang static analyzer' 1610 @echo ' clang-tidy - Check with clang-tidy' 1611 @echo '' 1612 @echo 'Tools:' 1613 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1614 @echo '' 1615 @echo 'Kernel selftest:' 1616 @echo ' kselftest - Build and run kernel selftest' 1617 @echo ' Build, install, and boot kernel before' 1618 @echo ' running kselftest on it' 1619 @echo ' Run as root for full coverage' 1620 @echo ' kselftest-all - Build kernel selftest' 1621 @echo ' kselftest-install - Build and install kernel selftest' 1622 @echo ' kselftest-clean - Remove all generated kselftest files' 1623 @echo ' kselftest-merge - Merge all the config dependencies of' 1624 @echo ' kselftest to existing .config.' 1625 @echo '' 1626 @$(if $(dtstree), \ 1627 echo 'Devicetree:'; \ 1628 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1629 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1630 echo ' dt_binding_check - Validate device tree binding documents'; \ 1631 echo ' dtbs_check - Validate device tree source files';\ 1632 echo '') 1633 1634 @echo 'Userspace tools targets:' 1635 @echo ' use "make tools/help"' 1636 @echo ' or "cd tools; make help"' 1637 @echo '' 1638 @echo 'Kernel packaging:' 1639 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1640 @echo '' 1641 @echo 'Documentation targets:' 1642 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1643 @echo '' 1644 @echo 'Architecture specific targets ($(SRCARCH)):' 1645 @$(if $(archhelp),$(archhelp),\ 1646 echo ' No architecture specific help defined for $(SRCARCH)') 1647 @echo '' 1648 @$(if $(boards), \ 1649 $(foreach b, $(boards), \ 1650 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1651 echo '') 1652 @$(if $(board-dirs), \ 1653 $(foreach b, $(board-dirs), \ 1654 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1655 printf " %-16s - Show all of the above\\n" help-boards; \ 1656 echo '') 1657 1658 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1659 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1660 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1661 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1662 @echo ' (sparse by default)' 1663 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1664 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1665 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1666 @echo ' 1: warnings which may be relevant and do not occur too often' 1667 @echo ' 2: warnings which occur quite often but may still be relevant' 1668 @echo ' 3: more obscure warnings, can most likely be ignored' 1669 @echo ' Multiple levels can be combined with W=12 or W=123' 1670 @echo '' 1671 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1672 @echo 'For further info see the ./README file' 1673 1674 1675help-board-dirs := $(addprefix help-,$(board-dirs)) 1676 1677help-boards: $(help-board-dirs) 1678 1679boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1680 1681$(help-board-dirs): help-%: 1682 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1683 @$(if $(boards-per-dir), \ 1684 $(foreach b, $(boards-per-dir), \ 1685 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1686 echo '') 1687 1688 1689# Documentation targets 1690# --------------------------------------------------------------------------- 1691DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1692 linkcheckdocs dochelp refcheckdocs 1693PHONY += $(DOC_TARGETS) 1694$(DOC_TARGETS): 1695 $(Q)$(MAKE) $(build)=Documentation $@ 1696 1697# Misc 1698# --------------------------------------------------------------------------- 1699 1700PHONY += scripts_gdb 1701scripts_gdb: prepare0 1702 $(Q)$(MAKE) $(build)=scripts/gdb 1703 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1704 1705ifdef CONFIG_GDB_SCRIPTS 1706all: scripts_gdb 1707endif 1708 1709else # KBUILD_EXTMOD 1710 1711### 1712# External module support. 1713# When building external modules the kernel used as basis is considered 1714# read-only, and no consistency checks are made and the make 1715# system is not used on the basis kernel. If updates are required 1716# in the basis kernel ordinary make commands (without M=...) must be used. 1717 1718# We are always building only modules. 1719KBUILD_BUILTIN := 1720KBUILD_MODULES := 1 1721 1722build-dirs := $(KBUILD_EXTMOD) 1723$(MODORDER): descend 1724 @: 1725 1726compile_commands.json: $(extmod_prefix)compile_commands.json 1727PHONY += compile_commands.json 1728 1729clean-dirs := $(KBUILD_EXTMOD) 1730clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1731 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1732 1733PHONY += prepare 1734# now expand this into a simple variable to reduce the cost of shell evaluations 1735prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1736prepare: 1737 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \ 1738 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1739 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \ 1740 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1741 fi 1742 1743PHONY += help 1744help: 1745 @echo ' Building external modules.' 1746 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1747 @echo '' 1748 @echo ' modules - default target, build the module(s)' 1749 @echo ' modules_install - install the module' 1750 @echo ' clean - remove generated files in module directory only' 1751 @echo '' 1752 1753# no-op for external module builds 1754PHONY += modules_prepare 1755 1756endif # KBUILD_EXTMOD 1757 1758# --------------------------------------------------------------------------- 1759# Modules 1760 1761PHONY += modules modules_install 1762 1763ifdef CONFIG_MODULES 1764 1765modules: modules_check 1766 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1767 1768PHONY += modules_check 1769modules_check: $(MODORDER) 1770 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1771 1772quiet_cmd_depmod = DEPMOD $(MODLIB) 1773 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1774 $(KERNELRELEASE) 1775 1776modules_install: 1777 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1778 $(call cmd,depmod) 1779 1780else # CONFIG_MODULES 1781 1782# Modules not configured 1783# --------------------------------------------------------------------------- 1784 1785modules modules_install: 1786 @echo >&2 '***' 1787 @echo >&2 '*** The present kernel configuration has modules disabled.' 1788 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1789 @echo >&2 '*** to enable CONFIG_MODULES.' 1790 @echo >&2 '***' 1791 @exit 1 1792 1793endif # CONFIG_MODULES 1794 1795# Single targets 1796# --------------------------------------------------------------------------- 1797# To build individual files in subdirectories, you can do like this: 1798# 1799# make foo/bar/baz.s 1800# 1801# The supported suffixes for single-target are listed in 'single-targets' 1802# 1803# To build only under specific subdirectories, you can do like this: 1804# 1805# make foo/bar/baz/ 1806 1807ifdef single-build 1808 1809# .ko is special because modpost is needed 1810single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1811single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1812 1813$(single-ko): single_modpost 1814 @: 1815$(single-no-ko): descend 1816 @: 1817 1818ifeq ($(KBUILD_EXTMOD),) 1819# For the single build of in-tree modules, use a temporary file to avoid 1820# the situation of modules_install installing an invalid modules.order. 1821MODORDER := .modules.tmp 1822endif 1823 1824PHONY += single_modpost 1825single_modpost: $(single-no-ko) modules_prepare 1826 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1827 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1828 1829KBUILD_MODULES := 1 1830 1831export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1832 1833# trim unrelated directories 1834build-dirs := $(foreach d, $(build-dirs), \ 1835 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1836 1837endif 1838 1839ifndef CONFIG_MODULES 1840KBUILD_MODULES := 1841endif 1842 1843# Handle descending into subdirectories listed in $(build-dirs) 1844# Preset locale variables to speed up the build process. Limit locale 1845# tweaks to this spot to avoid wrong language settings when running 1846# make menuconfig etc. 1847# Error messages still appears in the original language 1848PHONY += descend $(build-dirs) 1849descend: $(build-dirs) 1850$(build-dirs): prepare 1851 $(Q)$(MAKE) $(build)=$@ \ 1852 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1853 need-builtin=1 need-modorder=1 1854 1855clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1856PHONY += $(clean-dirs) clean 1857$(clean-dirs): 1858 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1859 1860clean: $(clean-dirs) 1861 $(call cmd,rmfiles) 1862 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1863 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1864 -o -name '*.ko.*' \ 1865 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1866 -o -name '*.dwo' -o -name '*.lst' \ 1867 -o -name '*.su' -o -name '*.mod' \ 1868 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1869 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1870 -o -name '*.asn1.[ch]' \ 1871 -o -name '*.symtypes' -o -name 'modules.order' \ 1872 -o -name '.tmp_*.o.*' \ 1873 -o -name '*.c.[012]*.*' \ 1874 -o -name '*.ll' \ 1875 -o -name '*.gcno' \ 1876 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1877 1878# Generate tags for editors 1879# --------------------------------------------------------------------------- 1880quiet_cmd_tags = GEN $@ 1881 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1882 1883tags TAGS cscope gtags: FORCE 1884 $(call cmd,tags) 1885 1886# Script to generate missing namespace dependencies 1887# --------------------------------------------------------------------------- 1888 1889PHONY += nsdeps 1890nsdeps: export KBUILD_NSDEPS=1 1891nsdeps: modules 1892 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1893 1894# Clang Tooling 1895# --------------------------------------------------------------------------- 1896 1897quiet_cmd_gen_compile_commands = GEN $@ 1898 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1899 1900$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1901 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1902 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1903 $(call if_changed,gen_compile_commands) 1904 1905targets += $(extmod_prefix)compile_commands.json 1906 1907PHONY += clang-tidy clang-analyzer 1908 1909ifdef CONFIG_CC_IS_CLANG 1910quiet_cmd_clang_tools = CHECK $< 1911 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1912 1913clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1914 $(call cmd,clang_tools) 1915else 1916clang-tidy clang-analyzer: 1917 @echo "$@ requires CC=clang" >&2 1918 @false 1919endif 1920 1921# Scripts to check various things for consistency 1922# --------------------------------------------------------------------------- 1923 1924PHONY += includecheck versioncheck coccicheck export_report 1925 1926includecheck: 1927 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1928 -name '*.[hcS]' -type f -print | sort \ 1929 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1930 1931versioncheck: 1932 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1933 -name '*.[hcS]' -type f -print | sort \ 1934 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1935 1936coccicheck: 1937 $(Q)$(BASH) $(srctree)/scripts/$@ 1938 1939export_report: 1940 $(PERL) $(srctree)/scripts/export_report.pl 1941 1942PHONY += checkstack kernelrelease kernelversion image_name 1943 1944# UML needs a little special treatment here. It wants to use the host 1945# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1946# else wants $(ARCH), including people doing cross-builds, which means 1947# that $(SUBARCH) doesn't work here. 1948ifeq ($(ARCH), um) 1949CHECKSTACK_ARCH := $(SUBARCH) 1950else 1951CHECKSTACK_ARCH := $(ARCH) 1952endif 1953checkstack: 1954 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1955 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1956 1957kernelrelease: 1958 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1959 1960kernelversion: 1961 @echo $(KERNELVERSION) 1962 1963image_name: 1964 @echo $(KBUILD_IMAGE) 1965 1966quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1967 cmd_rmfiles = rm -rf $(rm-files) 1968 1969# read saved command lines for existing targets 1970existing-targets := $(wildcard $(sort $(targets))) 1971 1972-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1973 1974endif # config-build 1975endif # mixed-build 1976endif # need-sub-make 1977 1978PHONY += FORCE 1979FORCE: 1980 1981# Declare the contents of the PHONY variable as phony. We keep that 1982# information in a variable so we can use it in if_changed and friends. 1983.PHONY: $(PHONY) 1984