1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 10 4SUBLEVEL = 184 5EXTRAVERSION = 6NAME = Dare mighty things 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 97 98ifeq ($(filter 3.%,$(MAKE_VERSION)),) 99silence:=$(findstring s,$(firstword -$(MAKEFLAGS))) 100else 101silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS))) 102endif 103 104ifeq ($(silence),s) 105quiet=silent_ 106endif 107 108export quiet Q KBUILD_VERBOSE 109 110# Kbuild will save output files in the current working directory. 111# This does not need to match to the root of the kernel source tree. 112# 113# For example, you can do this: 114# 115# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 116# 117# If you want to save output files in a different location, there are 118# two syntaxes to specify it. 119# 120# 1) O= 121# Use "make O=dir/to/store/output/files/" 122# 123# 2) Set KBUILD_OUTPUT 124# Set the environment variable KBUILD_OUTPUT to point to the output directory. 125# export KBUILD_OUTPUT=dir/to/store/output/files/; make 126# 127# The O= assignment takes precedence over the KBUILD_OUTPUT environment 128# variable. 129 130# Do we want to change the working directory? 131ifeq ("$(origin O)", "command line") 132 KBUILD_OUTPUT := $(O) 133endif 134 135ifneq ($(KBUILD_OUTPUT),) 136# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 137# expand a shell special character '~'. We use a somewhat tedious way here. 138abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 139$(if $(abs_objtree),, \ 140 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 141 142# $(realpath ...) resolves symlinks 143abs_objtree := $(realpath $(abs_objtree)) 144else 145abs_objtree := $(CURDIR) 146endif # ifneq ($(KBUILD_OUTPUT),) 147 148ifeq ($(abs_objtree),$(CURDIR)) 149# Suppress "Entering directory ..." unless we are changing the work directory. 150MAKEFLAGS += --no-print-directory 151else 152need-sub-make := 1 153endif 154 155abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 156 157ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 158$(error source directory cannot contain spaces or colons) 159endif 160 161ifneq ($(abs_srctree),$(abs_objtree)) 162# Look for make include files relative to root of kernel src 163# 164# This does not become effective immediately because MAKEFLAGS is re-parsed 165# once after the Makefile is read. We need to invoke sub-make. 166MAKEFLAGS += --include-dir=$(abs_srctree) 167need-sub-make := 1 168endif 169 170this-makefile := $(lastword $(MAKEFILE_LIST)) 171 172ifneq ($(filter 3.%,$(MAKE_VERSION)),) 173# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 174# We need to invoke sub-make to avoid implicit rules in the top Makefile. 175need-sub-make := 1 176# Cancel implicit rules for this Makefile. 177$(this-makefile): ; 178endif 179 180export abs_srctree abs_objtree 181export sub_make_done := 1 182 183ifeq ($(need-sub-make),1) 184 185PHONY += $(MAKECMDGOALS) __sub-make 186 187$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 188 @: 189 190# Invoke a second make in the output directory, passing relevant variables 191__sub-make: 192 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 193 194endif # need-sub-make 195endif # sub_make_done 196 197# We process the rest of the Makefile if this is the final invocation of make 198ifeq ($(need-sub-make),) 199 200# Do not print "Entering directory ...", 201# but we want to display it when entering to the output directory 202# so that IDEs/editors are able to understand relative filenames. 203MAKEFLAGS += --no-print-directory 204 205# Call a source code checker (by default, "sparse") as part of the 206# C compilation. 207# 208# Use 'make C=1' to enable checking of only re-compiled files. 209# Use 'make C=2' to enable checking of *all* source files, regardless 210# of whether they are re-compiled or not. 211# 212# See the file "Documentation/dev-tools/sparse.rst" for more details, 213# including where to get the "sparse" utility. 214 215ifeq ("$(origin C)", "command line") 216 KBUILD_CHECKSRC = $(C) 217endif 218ifndef KBUILD_CHECKSRC 219 KBUILD_CHECKSRC = 0 220endif 221 222# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 223# directory of external module to build. Setting M= takes precedence. 224ifeq ("$(origin M)", "command line") 225 KBUILD_EXTMOD := $(M) 226endif 227 228$(if $(word 2, $(KBUILD_EXTMOD)), \ 229 $(error building multiple external modules is not supported)) 230 231export KBUILD_CHECKSRC KBUILD_EXTMOD 232 233extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 234 235ifeq ($(abs_srctree),$(abs_objtree)) 236 # building in the source tree 237 srctree := . 238 building_out_of_srctree := 239else 240 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 241 # building in a subdirectory of the source tree 242 srctree := .. 243 else 244 srctree := $(abs_srctree) 245 endif 246 building_out_of_srctree := 1 247endif 248 249ifneq ($(KBUILD_ABS_SRCTREE),) 250srctree := $(abs_srctree) 251endif 252 253objtree := . 254VPATH := $(srctree) 255 256export building_out_of_srctree srctree objtree VPATH 257 258# To make sure we do not include .config for any of the *config targets 259# catch them early, and hand them over to scripts/kconfig/Makefile 260# It is allowed to specify more targets when calling make, including 261# mixing *config targets and build targets. 262# For example 'make oldconfig all'. 263# Detect when mixed targets is specified, and make a second invocation 264# of make so .config is not included in this case either (for *config). 265 266version_h := include/generated/uapi/linux/version.h 267old_version_h := include/linux/version.h 268 269clean-targets := %clean mrproper cleandocs 270no-dot-config-targets := $(clean-targets) \ 271 cscope gtags TAGS tags help% %docs check% coccicheck \ 272 $(version_h) headers headers_% archheaders archscripts \ 273 %asm-generic kernelversion %src-pkg dt_binding_check \ 274 outputmakefile 275no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 276 image_name 277single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 278 279config-build := 280mixed-build := 281need-config := 1 282may-sync-config := 1 283single-build := 284 285ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 286 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 287 need-config := 288 endif 289endif 290 291ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 292 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 293 may-sync-config := 294 endif 295endif 296 297ifneq ($(KBUILD_EXTMOD),) 298 may-sync-config := 299endif 300 301ifeq ($(KBUILD_EXTMOD),) 302 ifneq ($(filter %config,$(MAKECMDGOALS)),) 303 config-build := 1 304 ifneq ($(words $(MAKECMDGOALS)),1) 305 mixed-build := 1 306 endif 307 endif 308endif 309 310# We cannot build single targets and the others at the same time 311ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 312 single-build := 1 313 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 314 mixed-build := 1 315 endif 316endif 317 318# For "make -j clean all", "make -j mrproper defconfig all", etc. 319ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 320 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325# install and modules_install need also be processed one by one 326ifneq ($(filter install,$(MAKECMDGOALS)),) 327 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332ifdef mixed-build 333# =========================================================================== 334# We're called with mixed targets (*config and build targets). 335# Handle them one by one. 336 337PHONY += $(MAKECMDGOALS) __build_one_by_one 338 339$(MAKECMDGOALS): __build_one_by_one 340 @: 341 342__build_one_by_one: 343 $(Q)set -e; \ 344 for i in $(MAKECMDGOALS); do \ 345 $(MAKE) -f $(srctree)/Makefile $$i; \ 346 done 347 348else # !mixed-build 349 350include scripts/Kbuild.include 351 352# Read KERNELRELEASE from include/config/kernel.release (if it exists) 353KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 354KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 355export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 356 357include scripts/subarch.include 358 359# Cross compiling and selecting different set of gcc/bin-utils 360# --------------------------------------------------------------------------- 361# 362# When performing cross compilation for other architectures ARCH shall be set 363# to the target architecture. (See arch/* for the possibilities). 364# ARCH can be set during invocation of make: 365# make ARCH=ia64 366# Another way is to have ARCH set in the environment. 367# The default ARCH is the host where make is executed. 368 369# CROSS_COMPILE specify the prefix used for all executables used 370# during compilation. Only gcc and related bin-utils executables 371# are prefixed with $(CROSS_COMPILE). 372# CROSS_COMPILE can be set on the command line 373# make CROSS_COMPILE=ia64-linux- 374# Alternatively CROSS_COMPILE can be set in the environment. 375# Default value for CROSS_COMPILE is not to prefix executables 376# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 377ARCH ?= $(SUBARCH) 378 379# Architecture as present in compile.h 380UTS_MACHINE := $(ARCH) 381SRCARCH := $(ARCH) 382 383# Additional ARCH settings for x86 384ifeq ($(ARCH),i386) 385 SRCARCH := x86 386endif 387ifeq ($(ARCH),x86_64) 388 SRCARCH := x86 389endif 390 391# Additional ARCH settings for sparc 392ifeq ($(ARCH),sparc32) 393 SRCARCH := sparc 394endif 395ifeq ($(ARCH),sparc64) 396 SRCARCH := sparc 397endif 398 399# Additional ARCH settings for sh 400ifeq ($(ARCH),sh64) 401 SRCARCH := sh 402endif 403 404KCONFIG_CONFIG ?= .config 405export KCONFIG_CONFIG 406 407# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 408export KBUILD_DEFCONFIG := defconfig 409 410# SHELL used by kbuild 411CONFIG_SHELL := sh 412 413HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 414HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 415HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 416 417ifneq ($(LLVM),) 418HOSTCC = clang 419HOSTCXX = clang++ 420else 421HOSTCC = gcc 422HOSTCXX = g++ 423endif 424 425export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 426 -O2 -fomit-frame-pointer -std=gnu89 427export KBUILD_USERLDFLAGS := 428 429KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 430KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 431KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 432KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 433 434# Make variables (CC, etc...) 435CPP = $(CC) -E 436CCACHE = ccache 437ifneq ($(LLVM),) 438CC = $(CCACHE) clang 439LD = ld.lld 440AR = llvm-ar 441NM = llvm-nm 442OBJCOPY = llvm-objcopy 443OBJDUMP = llvm-objdump 444READELF = llvm-readelf 445STRIP = llvm-strip 446else 447CC = $(CCACHE) $(CROSS_COMPILE)gcc 448LD = $(CROSS_COMPILE)ld 449AR = $(CROSS_COMPILE)ar 450NM = $(CROSS_COMPILE)nm 451OBJCOPY = $(CROSS_COMPILE)objcopy 452OBJDUMP = $(CROSS_COMPILE)objdump 453READELF = $(CROSS_COMPILE)readelf 454STRIP = $(CROSS_COMPILE)strip 455endif 456PAHOLE = pahole 457RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 458LEX = flex 459YACC = bison 460AWK = awk 461INSTALLKERNEL := installkernel 462DEPMOD = depmod 463PERL = perl 464PYTHON = python 465PYTHON3 = python3 466CHECK = sparse 467BASH = bash 468KGZIP = gzip 469KBZIP2 = bzip2 470KLZOP = lzop 471LZMA = lzma 472LZ4 = lz4c 473XZ = xz 474ZSTD = zstd 475 476PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 477 478CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 479 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 480NOSTDINC_FLAGS := 481CFLAGS_MODULE = 482AFLAGS_MODULE = 483LDFLAGS_MODULE = 484CFLAGS_KERNEL = 485AFLAGS_KERNEL = 486LDFLAGS_vmlinux = 487 488# Use USERINCLUDE when you must reference the UAPI directories only. 489USERINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 492 -I$(srctree)/include/uapi \ 493 -I$(objtree)/include/generated/uapi \ 494 -include $(srctree)/include/linux/kconfig.h 495 496# Use LINUXINCLUDE when you must reference the include/ directory. 497# Needed to be compatible with the O= option 498LINUXINCLUDE := \ 499 -I$(srctree)/arch/$(SRCARCH)/include \ 500 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 501 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 502 -I$(objtree)/include \ 503 $(USERINCLUDE) 504 505KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 506KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 507 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 508 -Werror=implicit-function-declaration -Werror=implicit-int \ 509 -Werror=return-type -Wno-format-security \ 510 -std=gnu89 511KBUILD_CPPFLAGS := -D__KERNEL__ 512KBUILD_AFLAGS_KERNEL := 513KBUILD_CFLAGS_KERNEL := 514KBUILD_AFLAGS_MODULE := -DMODULE 515KBUILD_CFLAGS_MODULE := -DMODULE 516KBUILD_LDFLAGS_MODULE := 517KBUILD_LDFLAGS := 518CLANG_FLAGS := 519 520export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 521export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 522export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 523export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 524export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 525 526export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 527export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 528export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 529export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 530export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 531export PAHOLE_FLAGS 532 533# Files to ignore in find ... statements 534 535export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 536 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 537 -prune -o 538export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 539 --exclude CVS --exclude .pc --exclude .hg --exclude .git 540 541# =========================================================================== 542# Rules shared between *config targets and build targets 543 544# Basic helpers built in scripts/basic/ 545PHONY += scripts_basic 546scripts_basic: 547 $(Q)$(MAKE) $(build)=scripts/basic 548 $(Q)rm -f .tmp_quiet_recordmcount 549 550PHONY += outputmakefile 551# Before starting out-of-tree build, make sure the source tree is clean. 552# outputmakefile generates a Makefile in the output directory, if using a 553# separate output directory. This allows convenient use of make in the 554# output directory. 555# At the same time when output Makefile generated, generate .gitignore to 556# ignore whole output directory 557outputmakefile: 558ifdef building_out_of_srctree 559 $(Q)if [ -f $(srctree)/.config -o \ 560 -d $(srctree)/include/config -o \ 561 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 562 echo >&2 "***"; \ 563 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 564 echo >&2 "*** in $(abs_srctree)";\ 565 echo >&2 "***"; \ 566 false; \ 567 fi 568 $(Q)ln -fsn $(srctree) source 569 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 570 $(Q)test -e .gitignore || \ 571 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 572endif 573 574ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 575include $(srctree)/scripts/Makefile.clang 576endif 577 578# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 579# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 580# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 581# and from include/config/auto.conf.cmd to detect the compiler upgrade. 582CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 583 584ifdef config-build 585# =========================================================================== 586# *config targets only - make sure prerequisites are updated, and descend 587# in scripts/kconfig to make the *config target 588 589# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 590# KBUILD_DEFCONFIG may point out an alternative default configuration 591# used for 'make defconfig' 592include arch/$(SRCARCH)/Makefile 593export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 594 595config: outputmakefile scripts_basic FORCE 596 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 597 598%config: outputmakefile scripts_basic FORCE 599 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 600 601else #!config-build 602# =========================================================================== 603# Build targets only - this includes vmlinux, arch specific targets, clean 604# targets and others. In general all targets except *config targets. 605 606# If building an external module we do not care about the all: rule 607# but instead __all depend on modules 608PHONY += all 609ifeq ($(KBUILD_EXTMOD),) 610__all: all 611else 612__all: modules 613endif 614 615# Decide whether to build built-in, modular, or both. 616# Normally, just do built-in. 617 618KBUILD_MODULES := 619KBUILD_BUILTIN := 1 620 621# If we have only "make modules", don't compile built-in objects. 622ifeq ($(MAKECMDGOALS),modules) 623 KBUILD_BUILTIN := 624endif 625 626# If we have "make <whatever> modules", compile modules 627# in addition to whatever we do anyway. 628# Just "make" or "make all" shall build modules as well 629 630ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 631 KBUILD_MODULES := 1 632endif 633 634ifeq ($(MAKECMDGOALS),) 635 KBUILD_MODULES := 1 636endif 637 638export KBUILD_MODULES KBUILD_BUILTIN 639 640ifdef need-config 641include include/config/auto.conf 642endif 643 644ifeq ($(KBUILD_EXTMOD),) 645# Objects we will link into vmlinux / subdirs we need to visit 646core-y := init/ usr/ 647drivers-y := drivers/ sound/ 648drivers-$(CONFIG_SAMPLES) += samples/ 649drivers-y += net/ virt/ 650libs-y := lib/ 651vendor-$(CONFIG_OHOS_VENDOR) := vendor/ 652endif # KBUILD_EXTMOD 653 654# The all: target is the default when no target is given on the 655# command line. 656# This allow a user to issue only 'make' to build a kernel including modules 657# Defaults to vmlinux, but the arch makefile usually adds further targets 658all: vmlinux 659 660CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 661 $(call cc-option,-fno-tree-loop-im) \ 662 $(call cc-disable-warning,maybe-uninitialized,) 663export CFLAGS_GCOV 664 665# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 666ifdef CONFIG_FUNCTION_TRACER 667 CC_FLAGS_FTRACE := -pg 668endif 669 670ifdef CONFIG_CC_IS_GCC 671RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 672RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix) 673RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 674endif 675ifdef CONFIG_CC_IS_CLANG 676RETPOLINE_CFLAGS := -mretpoline-external-thunk 677RETPOLINE_VDSO_CFLAGS := -mretpoline 678endif 679 680ifdef CONFIG_RETHUNK 681RETHUNK_CFLAGS := -mfunction-return=thunk-extern 682RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) 683endif 684 685export RETPOLINE_CFLAGS 686export RETPOLINE_VDSO_CFLAGS 687 688include arch/$(SRCARCH)/Makefile 689 690ifdef need-config 691ifdef may-sync-config 692# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 693# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 694# because some architectures define CROSS_COMPILE there. 695include include/config/auto.conf.cmd 696 697$(KCONFIG_CONFIG): 698 @echo >&2 '***' 699 @echo >&2 '*** Configuration file "$@" not found!' 700 @echo >&2 '***' 701 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 702 @echo >&2 '*** "make menuconfig" or "make xconfig").' 703 @echo >&2 '***' 704 @/bin/false 705 706# The actual configuration files used during the build are stored in 707# include/generated/ and include/config/. Update them if .config is newer than 708# include/config/auto.conf (which mirrors .config). 709# 710# This exploits the 'multi-target pattern rule' trick. 711# The syncconfig should be executed only once to make all the targets. 712# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 713# 714# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 715# so you cannot notice that Kconfig is waiting for the user input. 716%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 717 $(Q)$(kecho) " SYNC $@" 718 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 719else # !may-sync-config 720# External modules and some install targets need include/generated/autoconf.h 721# and include/config/auto.conf but do not care if they are up-to-date. 722# Use auto.conf to trigger the test 723PHONY += include/config/auto.conf 724 725include/config/auto.conf: 726 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 727 echo >&2; \ 728 echo >&2 " ERROR: Kernel configuration is invalid."; \ 729 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 730 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 731 echo >&2 ; \ 732 /bin/false) 733 734endif # may-sync-config 735endif # need-config 736 737KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 738KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 739KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 740KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 741KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 742 743ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 744KBUILD_CFLAGS += -O2 745else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 746KBUILD_CFLAGS += -O3 747else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 748KBUILD_CFLAGS += -Os 749endif 750 751# Tell gcc to never replace conditional load with a non-conditional one 752KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 753KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 754 755ifdef CONFIG_READABLE_ASM 756# Disable optimizations that make assembler listings hard to read. 757# reorder blocks reorders the control in the function 758# ipa clone creates specialized cloned functions 759# partial inlining inlines only parts of functions 760KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 761 $(call cc-option,-fno-ipa-cp-clone,) \ 762 $(call cc-option,-fno-partial-inlining) 763endif 764 765ifneq ($(CONFIG_FRAME_WARN),0) 766KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 767endif 768 769stackp-flags-y := -fno-stack-protector 770stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 771stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 772 773KBUILD_CFLAGS += $(stackp-flags-y) 774 775ifdef CONFIG_CC_IS_CLANG 776KBUILD_CPPFLAGS += -Qunused-arguments 777KBUILD_CFLAGS += -Wno-format-invalid-specifier 778KBUILD_CFLAGS += -Wno-gnu 779# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 780# source of a reference will be _MergedGlobals and not on of the whitelisted names. 781# See modpost pattern 2 782KBUILD_CFLAGS += -mno-global-merge 783else 784 785# Warn about unmarked fall-throughs in switch statement. 786# Disabled for clang while comment to attribute conversion happens and 787# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 788KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 789endif 790 791# These warnings generated too much noise in a regular build. 792# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 793KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 794 795KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 796 797# These result in bogus false positives 798KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 799 800ifdef CONFIG_FRAME_POINTER 801KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 802else 803# Some targets (ARM with Thumb2, for example), can't be built with frame 804# pointers. For those, we don't have FUNCTION_TRACER automatically 805# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 806# incompatible with -fomit-frame-pointer with current GCC, so we don't use 807# -fomit-frame-pointer with FUNCTION_TRACER. 808ifndef CONFIG_FUNCTION_TRACER 809KBUILD_CFLAGS += -fomit-frame-pointer 810endif 811endif 812 813# Initialize all stack variables with a 0xAA pattern. 814ifdef CONFIG_INIT_STACK_ALL_PATTERN 815KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 816endif 817 818# Initialize all stack variables with a zero value. 819ifdef CONFIG_INIT_STACK_ALL_ZERO 820KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 821ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 822# https://github.com/llvm/llvm-project/issues/44842 823KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 824endif 825endif 826 827DEBUG_CFLAGS := 828 829# Workaround for GCC versions < 5.0 830# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 831ifdef CONFIG_CC_IS_GCC 832DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 833endif 834 835ifdef CONFIG_DEBUG_INFO 836 837ifdef CONFIG_DEBUG_INFO_SPLIT 838DEBUG_CFLAGS += -gsplit-dwarf 839else 840DEBUG_CFLAGS += -g 841endif 842 843ifdef CONFIG_AS_IS_LLVM 844KBUILD_AFLAGS += -g 845else 846KBUILD_AFLAGS += -Wa,-gdwarf-2 847endif 848 849ifdef CONFIG_DEBUG_INFO_DWARF4 850DEBUG_CFLAGS += -gdwarf-4 851endif 852 853ifdef CONFIG_DEBUG_INFO_REDUCED 854DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 855 $(call cc-option,-fno-var-tracking) 856endif 857 858ifdef CONFIG_DEBUG_INFO_COMPRESSED 859DEBUG_CFLAGS += -gz=zlib 860KBUILD_AFLAGS += -gz=zlib 861KBUILD_LDFLAGS += --compress-debug-sections=zlib 862endif 863 864endif # CONFIG_DEBUG_INFO 865 866KBUILD_CFLAGS += $(DEBUG_CFLAGS) 867export DEBUG_CFLAGS 868 869ifdef CONFIG_FUNCTION_TRACER 870ifdef CONFIG_FTRACE_MCOUNT_USE_CC 871 CC_FLAGS_FTRACE += -mrecord-mcount 872 ifdef CONFIG_HAVE_NOP_MCOUNT 873 ifeq ($(call cc-option-yn, -mnop-mcount),y) 874 CC_FLAGS_FTRACE += -mnop-mcount 875 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 876 endif 877 endif 878endif 879ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 880 ifdef CONFIG_HAVE_C_RECORDMCOUNT 881 BUILD_C_RECORDMCOUNT := y 882 export BUILD_C_RECORDMCOUNT 883 endif 884endif 885ifdef CONFIG_HAVE_FENTRY 886 ifeq ($(call cc-option-yn, -mfentry),y) 887 CC_FLAGS_FTRACE += -mfentry 888 CC_FLAGS_USING += -DCC_USING_FENTRY 889 endif 890endif 891export CC_FLAGS_FTRACE 892KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 893KBUILD_AFLAGS += $(CC_FLAGS_USING) 894endif 895 896# We trigger additional mismatches with less inlining 897ifdef CONFIG_DEBUG_SECTION_MISMATCH 898KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 899endif 900 901ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 902KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 903LDFLAGS_vmlinux += --gc-sections 904endif 905 906ifdef CONFIG_SHADOW_CALL_STACK 907CC_FLAGS_SCS := -fsanitize=shadow-call-stack 908KBUILD_CFLAGS += $(CC_FLAGS_SCS) 909export CC_FLAGS_SCS 910endif 911 912ifdef CONFIG_LTO_CLANG 913ifdef CONFIG_LTO_CLANG_THIN 914CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 915KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 916else 917CC_FLAGS_LTO := -flto 918endif 919CC_FLAGS_LTO += -fvisibility=hidden 920 921# Limit inlining across translation units to reduce binary size 922KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 923endif 924 925ifdef CONFIG_LTO 926KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 927KBUILD_AFLAGS += -fno-lto 928export CC_FLAGS_LTO 929endif 930 931ifdef CONFIG_CFI_CLANG 932CC_FLAGS_CFI := -fsanitize=cfi \ 933 -fsanitize-cfi-cross-dso \ 934 -fno-sanitize-cfi-canonical-jump-tables \ 935 -fno-sanitize-trap=cfi \ 936 -fno-sanitize-blacklist 937 938ifdef CONFIG_CFI_PERMISSIVE 939CC_FLAGS_CFI += -fsanitize-recover=cfi 940endif 941 942# If LTO flags are filtered out, we must also filter out CFI. 943CC_FLAGS_LTO += $(CC_FLAGS_CFI) 944KBUILD_CFLAGS += $(CC_FLAGS_CFI) 945export CC_FLAGS_CFI 946endif 947 948ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 949KBUILD_CFLAGS += -falign-functions=32 950endif 951 952# arch Makefile may override CC so keep this after arch Makefile is included 953NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 954 955# warn about C99 declaration after statement 956KBUILD_CFLAGS += -Wdeclaration-after-statement 957 958# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 959KBUILD_CFLAGS += -Wvla 960 961# disable pointer signed / unsigned warnings in gcc 4.0 962KBUILD_CFLAGS += -Wno-pointer-sign 963 964# disable stringop warnings in gcc 8+ 965KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 966 967# We'll want to enable this eventually, but it's not going away for 5.7 at least 968KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 969KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 970KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 971 972# Another good warning that we'll want to enable eventually 973KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 974 975# Enabled with W=2, disabled by default as noisy 976KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 977 978# disable invalid "can't wrap" optimizations for signed / pointers 979KBUILD_CFLAGS += -fno-strict-overflow 980 981# Make sure -fstack-check isn't enabled (like gentoo apparently did) 982KBUILD_CFLAGS += -fno-stack-check 983 984# conserve stack if available 985KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 986 987# Prohibit date/time macros, which would make the build non-deterministic 988KBUILD_CFLAGS += -Werror=date-time 989 990# enforce correct pointer usage 991KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 992 993# Require designated initializers for all marked structures 994KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 995 996# change __FILE__ to the relative path from the srctree 997KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 998 999# include additional Makefiles when needed 1000include-y := scripts/Makefile.extrawarn 1001include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1002include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1003include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1004include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1005include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1006 1007include $(addprefix $(srctree)/, $(include-y)) 1008 1009# scripts/Makefile.gcc-plugins is intentionally included last. 1010# Do not add $(call cc-option,...) below this line. When you build the kernel 1011# from the clean source tree, the GCC plugins do not exist at this point. 1012 1013# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1014KBUILD_CPPFLAGS += $(KCPPFLAGS) 1015KBUILD_AFLAGS += $(KAFLAGS) 1016KBUILD_CFLAGS += $(KCFLAGS) 1017 1018KBUILD_LDFLAGS_MODULE += --build-id=sha1 1019LDFLAGS_vmlinux += --build-id=sha1 1020 1021KBUILD_LDFLAGS += -z noexecstack 1022KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1023 1024ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1025LDFLAGS_vmlinux += $(call ld-option, -X,) 1026endif 1027 1028ifeq ($(CONFIG_RELR),y) 1029LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1030endif 1031 1032# We never want expected sections to be placed heuristically by the 1033# linker. All sections should be explicitly named in the linker script. 1034ifdef CONFIG_LD_ORPHAN_WARN 1035LDFLAGS_vmlinux += --orphan-handling=warn 1036endif 1037 1038# Align the bit size of userspace programs with the kernel 1039KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1040KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1041 1042# make the checker run with the right architecture 1043CHECKFLAGS += --arch=$(ARCH) 1044 1045# insure the checker run with the right endianness 1046CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1047 1048# the checker needs the correct machine size 1049CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1050 1051# Default kernel image to build when no specific target is given. 1052# KBUILD_IMAGE may be overruled on the command line or 1053# set in the environment 1054# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1055# this default value 1056export KBUILD_IMAGE ?= vmlinux 1057 1058# 1059# INSTALL_PATH specifies where to place the updated kernel and system map 1060# images. Default is /boot, but you can set it to other values 1061export INSTALL_PATH ?= /boot 1062 1063# 1064# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1065# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1066# an argument if needed. Otherwise it defaults to the kernel install path 1067# 1068export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1069 1070# 1071# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1072# relocations required by build roots. This is not defined in the 1073# makefile but the argument can be passed to make if needed. 1074# 1075 1076MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1077export MODLIB 1078 1079# 1080# INSTALL_MOD_STRIP, if defined, will cause modules to be 1081# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1082# the default option --strip-debug will be used. Otherwise, 1083# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1084 1085ifdef INSTALL_MOD_STRIP 1086ifeq ($(INSTALL_MOD_STRIP),1) 1087mod_strip_cmd = $(STRIP) --strip-debug 1088else 1089mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1090endif # INSTALL_MOD_STRIP=1 1091else 1092mod_strip_cmd = true 1093endif # INSTALL_MOD_STRIP 1094export mod_strip_cmd 1095 1096# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1097# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1098# or CONFIG_MODULE_COMPRESS_XZ. 1099 1100mod_compress_cmd = true 1101ifdef CONFIG_MODULE_COMPRESS 1102 ifdef CONFIG_MODULE_COMPRESS_GZIP 1103 mod_compress_cmd = $(KGZIP) -n -f 1104 endif # CONFIG_MODULE_COMPRESS_GZIP 1105 ifdef CONFIG_MODULE_COMPRESS_XZ 1106 mod_compress_cmd = $(XZ) -f 1107 endif # CONFIG_MODULE_COMPRESS_XZ 1108endif # CONFIG_MODULE_COMPRESS 1109export mod_compress_cmd 1110 1111ifdef CONFIG_MODULE_SIG_ALL 1112$(eval $(call config_filename,MODULE_SIG_KEY)) 1113 1114mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1115else 1116mod_sign_cmd = true 1117endif 1118export mod_sign_cmd 1119 1120HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1121 1122has_libelf = $(call try-run,\ 1123 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1124 1125ifdef CONFIG_STACK_VALIDATION 1126 ifeq ($(has_libelf),1) 1127 objtool_target := tools/objtool FORCE 1128 else 1129 SKIP_STACK_VALIDATION := 1 1130 export SKIP_STACK_VALIDATION 1131 endif 1132endif 1133 1134PHONY += resolve_btfids_clean 1135 1136resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1137 1138# tools/bpf/resolve_btfids directory might not exist 1139# in output directory, skip its clean in that case 1140resolve_btfids_clean: 1141ifneq ($(wildcard $(resolve_btfids_O)),) 1142 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1143endif 1144 1145ifdef CONFIG_BPF 1146ifdef CONFIG_DEBUG_INFO_BTF 1147 ifeq ($(has_libelf),1) 1148 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1149 else 1150 ERROR_RESOLVE_BTFIDS := 1 1151 endif 1152endif # CONFIG_DEBUG_INFO_BTF 1153endif # CONFIG_BPF 1154 1155PHONY += prepare0 1156 1157export MODORDER := $(extmod-prefix)modules.order 1158export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1159 1160ifeq ($(KBUILD_EXTMOD),) 1161core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ io_uring/ 1162 1163vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1164 $(core-y) $(core-m) $(drivers-y) $(drivers-m) $(vendor-y) \ 1165 $(libs-y) $(libs-m))) 1166 1167vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1168 $(patsubst %/,%,$(filter %/, $(core-) \ 1169 $(drivers-) $(vendor-) $(libs-)))) 1170 1171build-dirs := $(vmlinux-dirs) 1172clean-dirs := $(vmlinux-alldirs) 1173 1174subdir-modorder := $(addsuffix /modules.order, $(build-dirs)) 1175 1176# Externally visible symbols (used by link-vmlinux.sh) 1177KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1178KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1179ifdef CONFIG_MODULES 1180KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1181KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1182else 1183KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1184endif 1185KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1186KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(vendor-y)) 1187 1188export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1189export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1190# used by scripts/Makefile.package 1191export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1192 1193vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1194 1195# Recurse until adjust_autoksyms.sh is satisfied 1196PHONY += autoksyms_recursive 1197ifdef CONFIG_TRIM_UNUSED_KSYMS 1198# For the kernel to actually contain only the needed exported symbols, 1199# we have to build modules as well to determine what those symbols are. 1200# (this can be evaluated only once include/config/auto.conf has been included) 1201KBUILD_MODULES := 1 1202 1203autoksyms_recursive: descend modules.order 1204 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1205 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1206endif 1207 1208autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1209 1210quiet_cmd_autoksyms_h = GEN $@ 1211 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1212 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1213 1214$(autoksyms_h): 1215 $(call cmd,autoksyms_h) 1216 1217ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1218 1219# Final link of vmlinux with optional arch pass after final link 1220cmd_link-vmlinux = \ 1221 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1222 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1223 1224vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1225 +$(call if_changed,link-vmlinux) 1226 1227targets := vmlinux 1228 1229# The actual objects are generated when descending, 1230# make sure no implicit rule kicks in 1231$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1232 1233filechk_kernel.release = \ 1234 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1235 1236# Store (new) KERNELRELEASE string in include/config/kernel.release 1237include/config/kernel.release: FORCE 1238 $(call filechk,kernel.release) 1239 1240# Additional helpers built in scripts/ 1241# Carefully list dependencies so we do not try to build scripts twice 1242# in parallel 1243PHONY += scripts 1244scripts: scripts_basic scripts_dtc 1245 $(Q)$(MAKE) $(build)=$(@) 1246 1247# Things we need to do before we recursively start building the kernel 1248# or the modules are listed in "prepare". 1249# A multi level approach is used. prepareN is processed before prepareN-1. 1250# archprepare is used in arch Makefiles and when processed asm symlink, 1251# version.h and scripts_basic is processed / created. 1252 1253PHONY += prepare archprepare 1254 1255archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1256 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1257 include/generated/autoconf.h 1258 1259prepare0: archprepare 1260 $(Q)$(MAKE) $(build)=scripts/mod 1261 $(Q)$(MAKE) $(build)=. 1262 1263# All the preparing.. 1264prepare: prepare0 prepare-objtool prepare-resolve_btfids 1265 1266# Support for using generic headers in asm-generic 1267asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1268 1269PHONY += asm-generic uapi-asm-generic 1270asm-generic: uapi-asm-generic 1271 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1272 generic=include/asm-generic 1273uapi-asm-generic: 1274 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1275 generic=include/uapi/asm-generic 1276 1277PHONY += prepare-objtool prepare-resolve_btfids 1278prepare-objtool: $(objtool_target) 1279ifeq ($(SKIP_STACK_VALIDATION),1) 1280ifdef CONFIG_UNWINDER_ORC 1281 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1282 @false 1283else 1284 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1285endif 1286endif 1287 1288prepare-resolve_btfids: $(resolve_btfids_target) 1289ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1290 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1291 @false 1292endif 1293# Generate some files 1294# --------------------------------------------------------------------------- 1295 1296# KERNELRELEASE can change from a few different places, meaning version.h 1297# needs to be updated, so this check is forced on all builds 1298 1299uts_len := 64 1300define filechk_utsrelease.h 1301 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1302 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1303 exit 1; \ 1304 fi; \ 1305 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1306endef 1307 1308define filechk_version.h 1309 if [ $(SUBLEVEL) -gt 255 ]; then \ 1310 echo \#define LINUX_VERSION_CODE $(shell \ 1311 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1312 else \ 1313 echo \#define LINUX_VERSION_CODE $(shell \ 1314 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1315 fi; \ 1316 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1317 ((c) > 255 ? 255 : (c)))' 1318endef 1319 1320$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1321$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1322$(version_h): FORCE 1323 $(call filechk,version.h) 1324 $(Q)rm -f $(old_version_h) 1325 1326include/generated/utsrelease.h: include/config/kernel.release FORCE 1327 $(call filechk,utsrelease.h) 1328 1329PHONY += headerdep 1330headerdep: 1331 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1332 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1333 1334# --------------------------------------------------------------------------- 1335# Kernel headers 1336 1337#Default location for installed headers 1338export INSTALL_HDR_PATH = $(objtree)/usr 1339 1340quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1341 cmd_headers_install = \ 1342 mkdir -p $(INSTALL_HDR_PATH); \ 1343 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1344 usr/include $(INSTALL_HDR_PATH) 1345 1346PHONY += headers_install 1347headers_install: headers 1348 $(call cmd,headers_install) 1349 1350PHONY += archheaders archscripts 1351 1352hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1353 1354PHONY += headers 1355headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1356 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1357 $(error Headers not exportable for the $(SRCARCH) architecture)) 1358 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1359 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1360 1361# Deprecated. It is no-op now. 1362PHONY += headers_check 1363headers_check: 1364 @: 1365 1366ifdef CONFIG_HEADERS_INSTALL 1367prepare: headers 1368endif 1369 1370PHONY += scripts_unifdef 1371scripts_unifdef: scripts_basic 1372 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1373 1374# --------------------------------------------------------------------------- 1375# Kernel selftest 1376 1377PHONY += kselftest 1378kselftest: 1379 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1380 1381kselftest-%: FORCE 1382 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1383 1384PHONY += kselftest-merge 1385kselftest-merge: 1386 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1387 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1388 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1389 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1390 1391# --------------------------------------------------------------------------- 1392# Devicetree files 1393 1394ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1395dtstree := arch/$(SRCARCH)/boot/dts 1396endif 1397 1398ifneq ($(dtstree),) 1399 1400%.dtb: include/config/kernel.release scripts_dtc 1401 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1402 1403PHONY += dtbs dtbs_install dtbs_check 1404dtbs: include/config/kernel.release scripts_dtc 1405 $(Q)$(MAKE) $(build)=$(dtstree) 1406 1407ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1408export CHECK_DTBS=y 1409dtbs: dt_binding_check 1410endif 1411 1412dtbs_check: dtbs 1413 1414dtbs_install: 1415 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1416 1417ifdef CONFIG_OF_EARLY_FLATTREE 1418all: dtbs 1419endif 1420 1421endif 1422 1423PHONY += scripts_dtc 1424scripts_dtc: scripts_basic 1425 $(Q)$(MAKE) $(build)=scripts/dtc 1426 1427ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1428export CHECK_DT_BINDING=y 1429endif 1430 1431PHONY += dt_binding_check 1432dt_binding_check: scripts_dtc 1433 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1434 1435# --------------------------------------------------------------------------- 1436# Modules 1437 1438ifdef CONFIG_MODULES 1439 1440# By default, build modules as well 1441 1442all: modules 1443 1444# When we're building modules with modversions, we need to consider 1445# the built-in objects during the descend as well, in order to 1446# make sure the checksums are up to date before we record them. 1447ifdef CONFIG_MODVERSIONS 1448 KBUILD_BUILTIN := 1 1449endif 1450 1451# Build modules 1452# 1453# A module can be listed more than once in obj-m resulting in 1454# duplicate lines in modules.order files. Those are removed 1455# using awk while concatenating to the final file. 1456 1457PHONY += modules 1458modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1459 1460PHONY += modules_check 1461modules_check: modules.order 1462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1463 1464cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1465 1466modules.order: $(subdir-modorder) FORCE 1467 $(call if_changed,modules_order) 1468 1469targets += modules.order 1470 1471# Target to prepare building external modules 1472PHONY += modules_prepare 1473modules_prepare: prepare 1474 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 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 $(MODLIB)/ 1490 1491ifeq ($(CONFIG_MODULE_SIG), y) 1492PHONY += modules_sign 1493modules_sign: 1494 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1495endif 1496 1497endif # CONFIG_MODULES 1498 1499### 1500# Cleaning is done on three levels. 1501# make clean Delete most generated files 1502# Leave enough to build external modules 1503# make mrproper Delete the current configuration, and all generated files 1504# make distclean Remove editor backup files, patch leftover files and the like 1505 1506# Directories & files removed with 'make clean' 1507CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1508 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1509 compile_commands.json .thinlto-cache 1510 1511# Directories & files removed with 'make mrproper' 1512MRPROPER_FILES += include/config include/generated \ 1513 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1514 debian snap tar-install \ 1515 .config .config.old .version \ 1516 Module.symvers \ 1517 signing_key.pem signing_key.priv signing_key.x509 \ 1518 x509.genkey extra_certificates signing_key.x509.keyid \ 1519 signing_key.x509.signer vmlinux-gdb.py \ 1520 *.spec 1521 1522# Directories & files removed with 'make distclean' 1523DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1524 1525# clean - Delete most, but leave enough to build external modules 1526# 1527clean: rm-files := $(CLEAN_FILES) 1528 1529PHONY += archclean vmlinuxclean 1530 1531vmlinuxclean: 1532 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1533 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1534 1535clean: archclean vmlinuxclean resolve_btfids_clean 1536 1537# mrproper - Delete all generated files, including .config 1538# 1539mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1540mrproper-dirs := $(addprefix _mrproper_,scripts) 1541 1542PHONY += $(mrproper-dirs) mrproper 1543$(mrproper-dirs): 1544 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1545 1546mrproper: clean $(mrproper-dirs) 1547 $(call cmd,rmfiles) 1548 1549# distclean 1550# 1551distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1552 1553PHONY += distclean 1554 1555distclean: mrproper 1556 $(call cmd,rmfiles) 1557 @find $(srctree) $(RCS_FIND_IGNORE) \ 1558 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1559 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1560 -o -name 'core' \) \ 1561 -type f -print | xargs rm -f 1562 1563 1564# Packaging of the kernel to various formats 1565# --------------------------------------------------------------------------- 1566 1567%src-pkg: FORCE 1568 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1569%pkg: include/config/kernel.release FORCE 1570 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1571 1572# Brief documentation of the typical targets used 1573# --------------------------------------------------------------------------- 1574 1575boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1576boards := $(sort $(notdir $(boards))) 1577board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1578board-dirs := $(sort $(notdir $(board-dirs:/=))) 1579 1580PHONY += help 1581help: 1582 @echo 'Cleaning targets:' 1583 @echo ' clean - Remove most generated files but keep the config and' 1584 @echo ' enough build support to build external modules' 1585 @echo ' mrproper - Remove all generated files + config + various backup files' 1586 @echo ' distclean - mrproper + remove editor backup and patch files' 1587 @echo '' 1588 @echo 'Configuration targets:' 1589 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1590 @echo '' 1591 @echo 'Other generic targets:' 1592 @echo ' all - Build all targets marked with [*]' 1593 @echo '* vmlinux - Build the bare kernel' 1594 @echo '* modules - Build all modules' 1595 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1596 @echo ' dir/ - Build all files in dir and below' 1597 @echo ' dir/file.[ois] - Build specified target only' 1598 @echo ' dir/file.ll - Build the LLVM assembly file' 1599 @echo ' (requires compiler support for LLVM assembly generation)' 1600 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1601 @echo ' (requires a recent binutils and recent build (System.map))' 1602 @echo ' dir/file.ko - Build module including final link' 1603 @echo ' modules_prepare - Set up for building external modules' 1604 @echo ' tags/TAGS - Generate tags file for editors' 1605 @echo ' cscope - Generate cscope index' 1606 @echo ' gtags - Generate GNU GLOBAL index' 1607 @echo ' kernelrelease - Output the release version string (use with make -s)' 1608 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1609 @echo ' image_name - Output the image name (use with make -s)' 1610 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1611 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1612 echo '' 1613 @echo 'Static analysers:' 1614 @echo ' checkstack - Generate a list of stack hogs' 1615 @echo ' versioncheck - Sanity check on version.h usage' 1616 @echo ' includecheck - Check for duplicate included header files' 1617 @echo ' export_report - List the usages of all exported symbols' 1618 @echo ' headerdep - Detect inclusion cycles in headers' 1619 @echo ' coccicheck - Check with Coccinelle' 1620 @echo ' clang-analyzer - Check with clang static analyzer' 1621 @echo ' clang-tidy - Check with clang-tidy' 1622 @echo '' 1623 @echo 'Tools:' 1624 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1625 @echo '' 1626 @echo 'Kernel selftest:' 1627 @echo ' kselftest - Build and run kernel selftest' 1628 @echo ' Build, install, and boot kernel before' 1629 @echo ' running kselftest on it' 1630 @echo ' Run as root for full coverage' 1631 @echo ' kselftest-all - Build kernel selftest' 1632 @echo ' kselftest-install - Build and install kernel selftest' 1633 @echo ' kselftest-clean - Remove all generated kselftest files' 1634 @echo ' kselftest-merge - Merge all the config dependencies of' 1635 @echo ' kselftest to existing .config.' 1636 @echo '' 1637 @$(if $(dtstree), \ 1638 echo 'Devicetree:'; \ 1639 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1640 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1641 echo ' dt_binding_check - Validate device tree binding documents'; \ 1642 echo ' dtbs_check - Validate device tree source files';\ 1643 echo '') 1644 1645 @echo 'Userspace tools targets:' 1646 @echo ' use "make tools/help"' 1647 @echo ' or "cd tools; make help"' 1648 @echo '' 1649 @echo 'Kernel packaging:' 1650 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1651 @echo '' 1652 @echo 'Documentation targets:' 1653 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1654 @echo '' 1655 @echo 'Architecture specific targets ($(SRCARCH)):' 1656 @$(if $(archhelp),$(archhelp),\ 1657 echo ' No architecture specific help defined for $(SRCARCH)') 1658 @echo '' 1659 @$(if $(boards), \ 1660 $(foreach b, $(boards), \ 1661 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1662 echo '') 1663 @$(if $(board-dirs), \ 1664 $(foreach b, $(board-dirs), \ 1665 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1666 printf " %-16s - Show all of the above\\n" help-boards; \ 1667 echo '') 1668 1669 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1670 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1671 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1672 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1673 @echo ' (sparse by default)' 1674 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1675 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1676 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1677 @echo ' 1: warnings which may be relevant and do not occur too often' 1678 @echo ' 2: warnings which occur quite often but may still be relevant' 1679 @echo ' 3: more obscure warnings, can most likely be ignored' 1680 @echo ' Multiple levels can be combined with W=12 or W=123' 1681 @echo '' 1682 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1683 @echo 'For further info see the ./README file' 1684 1685 1686help-board-dirs := $(addprefix help-,$(board-dirs)) 1687 1688help-boards: $(help-board-dirs) 1689 1690boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1691 1692$(help-board-dirs): help-%: 1693 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1694 @$(if $(boards-per-dir), \ 1695 $(foreach b, $(boards-per-dir), \ 1696 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1697 echo '') 1698 1699 1700# Documentation targets 1701# --------------------------------------------------------------------------- 1702DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1703 linkcheckdocs dochelp refcheckdocs 1704PHONY += $(DOC_TARGETS) 1705$(DOC_TARGETS): 1706 $(Q)$(MAKE) $(build)=Documentation $@ 1707 1708# Misc 1709# --------------------------------------------------------------------------- 1710 1711PHONY += scripts_gdb 1712scripts_gdb: prepare0 1713 $(Q)$(MAKE) $(build)=scripts/gdb 1714 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1715 1716ifdef CONFIG_GDB_SCRIPTS 1717all: scripts_gdb 1718endif 1719 1720else # KBUILD_EXTMOD 1721 1722### 1723# External module support. 1724# When building external modules the kernel used as basis is considered 1725# read-only, and no consistency checks are made and the make 1726# system is not used on the basis kernel. If updates are required 1727# in the basis kernel ordinary make commands (without M=...) must 1728# be used. 1729# 1730# The following are the only valid targets when building external 1731# modules. 1732# make M=dir clean Delete all automatically generated files 1733# make M=dir modules Make all modules in specified dir 1734# make M=dir Same as 'make M=dir modules' 1735# make M=dir modules_install 1736# Install the modules built in the module directory 1737# Assumes install directory is already created 1738 1739# We are always building only modules. 1740KBUILD_BUILTIN := 1741KBUILD_MODULES := 1 1742 1743build-dirs := $(KBUILD_EXTMOD) 1744$(MODORDER): descend 1745 @: 1746 1747compile_commands.json: $(extmod-prefix)compile_commands.json 1748PHONY += compile_commands.json 1749 1750clean-dirs := $(KBUILD_EXTMOD) 1751clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1752 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1753 1754PHONY += help 1755help: 1756 @echo ' Building external modules.' 1757 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1758 @echo '' 1759 @echo ' modules - default target, build the module(s)' 1760 @echo ' modules_install - install the module' 1761 @echo ' clean - remove generated files in module directory only' 1762 @echo '' 1763 1764# no-op for external module builds 1765PHONY += prepare modules_prepare 1766 1767endif # KBUILD_EXTMOD 1768 1769# --------------------------------------------------------------------------- 1770# Modules 1771 1772PHONY += modules modules_install 1773 1774ifdef CONFIG_MODULES 1775 1776modules: $(MODORDER) 1777 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1778 1779quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1780 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1781 $(KERNELRELEASE) 1782 1783modules_install: 1784 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1785 $(call cmd,depmod) 1786 1787else # CONFIG_MODULES 1788 1789# Modules not configured 1790# --------------------------------------------------------------------------- 1791 1792modules modules_install: 1793 @echo >&2 '***' 1794 @echo >&2 '*** The present kernel configuration has modules disabled.' 1795 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1796 @echo >&2 '*** to enable CONFIG_MODULES.' 1797 @echo >&2 '***' 1798 @exit 1 1799 1800KBUILD_MODULES := 1801 1802endif # CONFIG_MODULES 1803 1804# Single targets 1805# --------------------------------------------------------------------------- 1806# To build individual files in subdirectories, you can do like this: 1807# 1808# make foo/bar/baz.s 1809# 1810# The supported suffixes for single-target are listed in 'single-targets' 1811# 1812# To build only under specific subdirectories, you can do like this: 1813# 1814# make foo/bar/baz/ 1815 1816ifdef single-build 1817 1818# .ko is special because modpost is needed 1819single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1820single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1821 1822$(single-ko): single_modpost 1823 @: 1824$(single-no-ko): descend 1825 @: 1826 1827# Remove MODORDER when done because it is not the real one. 1828PHONY += single_modpost 1829single_modpost: $(single-no-ko) modules_prepare 1830 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1831 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1832 $(Q)rm -f $(MODORDER) 1833 1834export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1835 1836# trim unrelated directories 1837build-dirs := $(foreach d, $(build-dirs), \ 1838 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1839 1840endif 1841 1842# Handle descending into subdirectories listed in $(build-dirs) 1843# Preset locale variables to speed up the build process. Limit locale 1844# tweaks to this spot to avoid wrong language settings when running 1845# make menuconfig etc. 1846# Error messages still appears in the original language 1847PHONY += descend $(build-dirs) 1848descend: $(build-dirs) 1849$(build-dirs): prepare 1850 $(Q)$(MAKE) $(build)=$@ \ 1851 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1852 need-builtin=1 need-modorder=1 1853 1854clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1855PHONY += $(clean-dirs) clean 1856$(clean-dirs): 1857 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1858 1859clean: $(clean-dirs) 1860 $(call cmd,rmfiles) 1861 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1862 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1863 -o -name '*.ko.*' \ 1864 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1865 -o -name '*.dwo' -o -name '*.lst' \ 1866 -o -name '*.su' -o -name '*.mod' \ 1867 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1868 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1869 -o -name '*.asn1.[ch]' \ 1870 -o -name '*.symtypes' -o -name 'modules.order' \ 1871 -o -name '.tmp_*.o.*' \ 1872 -o -name '*.c.[012]*.*' \ 1873 -o -name '*.ll' \ 1874 -o -name '*.gcno' \ 1875 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1876 1877# Generate tags for editors 1878# --------------------------------------------------------------------------- 1879quiet_cmd_tags = GEN $@ 1880 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1881 1882tags TAGS cscope gtags: FORCE 1883 $(call cmd,tags) 1884 1885# Script to generate missing namespace dependencies 1886# --------------------------------------------------------------------------- 1887 1888PHONY += nsdeps 1889nsdeps: export KBUILD_NSDEPS=1 1890nsdeps: modules 1891 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1892 1893# Clang Tooling 1894# --------------------------------------------------------------------------- 1895 1896quiet_cmd_gen_compile_commands = GEN $@ 1897 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1898 1899$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1900 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1901 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1902 $(call if_changed,gen_compile_commands) 1903 1904targets += $(extmod-prefix)compile_commands.json 1905 1906PHONY += clang-tidy clang-analyzer 1907 1908ifdef CONFIG_CC_IS_CLANG 1909quiet_cmd_clang_tools = CHECK $< 1910 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1911 1912clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1913 $(call cmd,clang_tools) 1914else 1915clang-tidy clang-analyzer: 1916 @echo "$@ requires CC=clang" >&2 1917 @false 1918endif 1919 1920# Scripts to check various things for consistency 1921# --------------------------------------------------------------------------- 1922 1923PHONY += includecheck versioncheck coccicheck export_report 1924 1925includecheck: 1926 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1927 -name '*.[hcS]' -type f -print | sort \ 1928 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1929 1930versioncheck: 1931 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1932 -name '*.[hcS]' -type f -print | sort \ 1933 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1934 1935coccicheck: 1936 $(Q)$(BASH) $(srctree)/scripts/$@ 1937 1938export_report: 1939 $(PERL) $(srctree)/scripts/export_report.pl 1940 1941PHONY += checkstack kernelrelease kernelversion image_name 1942 1943# UML needs a little special treatment here. It wants to use the host 1944# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1945# else wants $(ARCH), including people doing cross-builds, which means 1946# that $(SUBARCH) doesn't work here. 1947ifeq ($(ARCH), um) 1948CHECKSTACK_ARCH := $(SUBARCH) 1949else 1950CHECKSTACK_ARCH := $(ARCH) 1951endif 1952checkstack: 1953 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1954 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1955 1956kernelrelease: 1957 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1958 1959kernelversion: 1960 @echo $(KERNELVERSION) 1961 1962image_name: 1963 @echo $(KBUILD_IMAGE) 1964 1965# Clear a bunch of variables before executing the submake 1966 1967ifeq ($(quiet),silent_) 1968tools_silent=s 1969endif 1970 1971tools/: FORCE 1972 $(Q)mkdir -p $(objtree)/tools 1973 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1974 1975tools/%: FORCE 1976 $(Q)mkdir -p $(objtree)/tools 1977 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1978 1979quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1980 cmd_rmfiles = rm -rf $(rm-files) 1981 1982# read saved command lines for existing targets 1983existing-targets := $(wildcard $(sort $(targets))) 1984 1985-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1986 1987endif # config-build 1988endif # mixed-build 1989endif # need-sub-make 1990 1991PHONY += FORCE 1992FORCE: 1993 1994# Declare the contents of the PHONY variable as phony. We keep that 1995# information in a variable so we can use it in if_changed and friends. 1996.PHONY: $(PHONY) 1997