1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 9 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Kleptomaniac Octopus 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(KBUILD_OUTPUT),) 129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130# expand a shell special character '~'. We use a somewhat tedious way here. 131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132$(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135# $(realpath ...) resolves symlinks 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183# Invoke a second make in the output directory, passing relevant variables 184__sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(need-sub-make),) 192 193# Do not print "Entering directory ...", 194# but we want to display it when entering to the output directory 195# so that IDEs/editors are able to understand relative filenames. 196MAKEFLAGS += --no-print-directory 197 198# Call a source code checker (by default, "sparse") as part of the 199# C compilation. 200# 201# Use 'make C=1' to enable checking of only re-compiled files. 202# Use 'make C=2' to enable checking of *all* source files, regardless 203# of whether they are re-compiled or not. 204# 205# See the file "Documentation/dev-tools/sparse.rst" for more details, 206# including where to get the "sparse" utility. 207 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease 269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271config-build := 272mixed-build := 273need-config := 1 274may-sync-config := 1 275single-build := 276 277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281endif 282 283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287endif 288 289ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291endif 292 293ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300endif 301 302# We cannot build single targets and the others at the same time 303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# For "make -j clean all", "make -j mrproper defconfig all", etc. 311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# install and modules_install need also be processed one by one 318ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324ifdef mixed-build 325# =========================================================================== 326# We're called with mixed targets (*config and build targets). 327# Handle them one by one. 328 329PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331$(MAKECMDGOALS): __build_one_by_one 332 @: 333 334__build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340else # !mixed-build 341 342include scripts/Kbuild.include 343 344# Read KERNELRELEASE from include/config/kernel.release (if it exists) 345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349include scripts/subarch.include 350 351# Cross compiling and selecting different set of gcc/bin-utils 352# --------------------------------------------------------------------------- 353# 354# When performing cross compilation for other architectures ARCH shall be set 355# to the target architecture. (See arch/* for the possibilities). 356# ARCH can be set during invocation of make: 357# make ARCH=ia64 358# Another way is to have ARCH set in the environment. 359# The default ARCH is the host where make is executed. 360 361# CROSS_COMPILE specify the prefix used for all executables used 362# during compilation. Only gcc and related bin-utils executables 363# are prefixed with $(CROSS_COMPILE). 364# CROSS_COMPILE can be set on the command line 365# make CROSS_COMPILE=ia64-linux- 366# Alternatively CROSS_COMPILE can be set in the environment. 367# Default value for CROSS_COMPILE is not to prefix executables 368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369ARCH ?= $(SUBARCH) 370 371# Architecture as present in compile.h 372UTS_MACHINE := $(ARCH) 373SRCARCH := $(ARCH) 374 375# Additional ARCH settings for x86 376ifeq ($(ARCH),i386) 377 SRCARCH := x86 378endif 379ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381endif 382 383# Additional ARCH settings for sparc 384ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386endif 387ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389endif 390 391# Additional ARCH settings for sh 392ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394endif 395 396KCONFIG_CONFIG ?= .config 397export KCONFIG_CONFIG 398 399# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 400export KBUILD_DEFCONFIG := defconfig 401 402# SHELL used by kbuild 403CONFIG_SHELL := sh 404 405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 408 409ifneq ($(LLVM),) 410HOSTCC = clang 411HOSTCXX = clang++ 412else 413HOSTCC = gcc 414HOSTCXX = g++ 415endif 416 417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 418 -O2 -fomit-frame-pointer -std=gnu89 419export KBUILD_USERLDFLAGS := 420 421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 425 426# Make variables (CC, etc...) 427CPP = $(CC) -E 428ifneq ($(LLVM),) 429CC = clang 430LD = ld.lld 431AR = llvm-ar 432NM = llvm-nm 433OBJCOPY = llvm-objcopy 434OBJDUMP = llvm-objdump 435READELF = llvm-readelf 436OBJSIZE = llvm-size 437STRIP = llvm-strip 438else 439CC = $(CROSS_COMPILE)gcc 440LD = $(CROSS_COMPILE)ld 441AR = $(CROSS_COMPILE)ar 442NM = $(CROSS_COMPILE)nm 443OBJCOPY = $(CROSS_COMPILE)objcopy 444OBJDUMP = $(CROSS_COMPILE)objdump 445READELF = $(CROSS_COMPILE)readelf 446OBJSIZE = $(CROSS_COMPILE)size 447STRIP = $(CROSS_COMPILE)strip 448endif 449PAHOLE = pahole 450RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 451LEX = flex 452YACC = bison 453AWK = awk 454INSTALLKERNEL := installkernel 455DEPMOD = /sbin/depmod 456PERL = perl 457PYTHON = python 458PYTHON3 = python3 459CHECK = sparse 460BASH = bash 461KGZIP = gzip 462KBZIP2 = bzip2 463KLZOP = lzop 464LZMA = lzma 465LZ4 = lz4c 466XZ = xz 467ZSTD = zstd 468 469CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 471NOSTDINC_FLAGS := 472CFLAGS_MODULE = 473AFLAGS_MODULE = 474LDFLAGS_MODULE = 475CFLAGS_KERNEL = 476AFLAGS_KERNEL = 477LDFLAGS_vmlinux = 478 479# Use USERINCLUDE when you must reference the UAPI directories only. 480USERINCLUDE := \ 481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 483 -I$(srctree)/include/uapi \ 484 -I$(objtree)/include/generated/uapi \ 485 -include $(srctree)/include/linux/kconfig.h 486 487# Use LINUXINCLUDE when you must reference the include/ directory. 488# Needed to be compatible with the O= option 489LINUXINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 492 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 493 -I$(objtree)/include \ 494 $(USERINCLUDE) 495 496KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 497KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 499 -Werror=implicit-function-declaration -Werror=implicit-int \ 500 -Wno-format-security \ 501 -std=gnu89 502KBUILD_CPPFLAGS := -D__KERNEL__ 503KBUILD_AFLAGS_KERNEL := 504KBUILD_CFLAGS_KERNEL := 505KBUILD_AFLAGS_MODULE := -DMODULE 506KBUILD_CFLAGS_MODULE := -DMODULE 507KBUILD_LDFLAGS_MODULE := 508KBUILD_LDFLAGS := 509CLANG_FLAGS := 510 511export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 512export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 513export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 514export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 515export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 516 517export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 518export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 519export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 520export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 521export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 522 523# Files to ignore in find ... statements 524 525export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 526 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 527 -prune -o 528export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 529 --exclude CVS --exclude .pc --exclude .hg --exclude .git 530 531# =========================================================================== 532# Rules shared between *config targets and build targets 533 534# Basic helpers built in scripts/basic/ 535PHONY += scripts_basic 536scripts_basic: 537 $(Q)$(MAKE) $(build)=scripts/basic 538 $(Q)rm -f .tmp_quiet_recordmcount 539 540PHONY += outputmakefile 541# Before starting out-of-tree build, make sure the source tree is clean. 542# outputmakefile generates a Makefile in the output directory, if using a 543# separate output directory. This allows convenient use of make in the 544# output directory. 545# At the same time when output Makefile generated, generate .gitignore to 546# ignore whole output directory 547outputmakefile: 548ifdef building_out_of_srctree 549 $(Q)if [ -f $(srctree)/.config -o \ 550 -d $(srctree)/include/config -o \ 551 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 552 echo >&2 "***"; \ 553 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 554 echo >&2 "*** in $(abs_srctree)";\ 555 echo >&2 "***"; \ 556 false; \ 557 fi 558 $(Q)ln -fsn $(srctree) source 559 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 560 $(Q)test -e .gitignore || \ 561 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 562endif 563 564ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 565ifneq ($(CROSS_COMPILE),) 566CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 567GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 568CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 569GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 570endif 571ifneq ($(GCC_TOOLCHAIN),) 572CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 573endif 574ifneq ($(LLVM_IAS),1) 575CLANG_FLAGS += -no-integrated-as 576endif 577CLANG_FLAGS += -Werror=unknown-warning-option 578KBUILD_CFLAGS += $(CLANG_FLAGS) 579KBUILD_AFLAGS += $(CLANG_FLAGS) 580export CLANG_FLAGS 581endif 582 583# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 584# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 585# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 586# and from include/config/auto.conf.cmd to detect the compiler upgrade. 587CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 588 589ifdef config-build 590# =========================================================================== 591# *config targets only - make sure prerequisites are updated, and descend 592# in scripts/kconfig to make the *config target 593 594# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 595# KBUILD_DEFCONFIG may point out an alternative default configuration 596# used for 'make defconfig' 597include arch/$(SRCARCH)/Makefile 598export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 599 600config: outputmakefile scripts_basic FORCE 601 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 602 603%config: outputmakefile scripts_basic FORCE 604 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 605 606else #!config-build 607# =========================================================================== 608# Build targets only - this includes vmlinux, arch specific targets, clean 609# targets and others. In general all targets except *config targets. 610 611# If building an external module we do not care about the all: rule 612# but instead __all depend on modules 613PHONY += all 614ifeq ($(KBUILD_EXTMOD),) 615__all: all 616else 617__all: modules 618endif 619 620# Decide whether to build built-in, modular, or both. 621# Normally, just do built-in. 622 623KBUILD_MODULES := 624KBUILD_BUILTIN := 1 625 626# If we have only "make modules", don't compile built-in objects. 627ifeq ($(MAKECMDGOALS),modules) 628 KBUILD_BUILTIN := 629endif 630 631# If we have "make <whatever> modules", compile modules 632# in addition to whatever we do anyway. 633# Just "make" or "make all" shall build modules as well 634 635ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 636 KBUILD_MODULES := 1 637endif 638 639ifeq ($(MAKECMDGOALS),) 640 KBUILD_MODULES := 1 641endif 642 643export KBUILD_MODULES KBUILD_BUILTIN 644 645ifdef need-config 646include include/config/auto.conf 647endif 648 649ifeq ($(KBUILD_EXTMOD),) 650# Objects we will link into vmlinux / subdirs we need to visit 651core-y := init/ usr/ 652drivers-y := drivers/ sound/ 653drivers-$(CONFIG_SAMPLES) += samples/ 654drivers-y += net/ virt/ 655libs-y := lib/ 656endif # KBUILD_EXTMOD 657 658# The all: target is the default when no target is given on the 659# command line. 660# This allow a user to issue only 'make' to build a kernel including modules 661# Defaults to vmlinux, but the arch makefile usually adds further targets 662all: vmlinux 663 664CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 665 $(call cc-option,-fno-tree-loop-im) \ 666 $(call cc-disable-warning,maybe-uninitialized,) 667export CFLAGS_GCOV 668 669# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 670ifdef CONFIG_FUNCTION_TRACER 671 CC_FLAGS_FTRACE := -pg 672endif 673 674RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 675RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 676RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 677RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 678RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 679RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 680export RETPOLINE_CFLAGS 681export RETPOLINE_VDSO_CFLAGS 682 683include arch/$(SRCARCH)/Makefile 684 685ifdef need-config 686ifdef may-sync-config 687# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 688# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 689# because some architectures define CROSS_COMPILE there. 690include include/config/auto.conf.cmd 691 692$(KCONFIG_CONFIG): 693 @echo >&2 '***' 694 @echo >&2 '*** Configuration file "$@" not found!' 695 @echo >&2 '***' 696 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 697 @echo >&2 '*** "make menuconfig" or "make xconfig").' 698 @echo >&2 '***' 699 @/bin/false 700 701# The actual configuration files used during the build are stored in 702# include/generated/ and include/config/. Update them if .config is newer than 703# include/config/auto.conf (which mirrors .config). 704# 705# This exploits the 'multi-target pattern rule' trick. 706# The syncconfig should be executed only once to make all the targets. 707# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 708quiet_cmd_syncconfig = SYNC $@ 709 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 710 711%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 712 +$(call cmd,syncconfig) 713else # !may-sync-config 714# External modules and some install targets need include/generated/autoconf.h 715# and include/config/auto.conf but do not care if they are up-to-date. 716# Use auto.conf to trigger the test 717PHONY += include/config/auto.conf 718 719include/config/auto.conf: 720 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 721 echo >&2; \ 722 echo >&2 " ERROR: Kernel configuration is invalid."; \ 723 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 724 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 725 echo >&2 ; \ 726 /bin/false) 727 728endif # may-sync-config 729endif # need-config 730 731KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 732KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 733KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 734KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 735KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 736 737ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 738KBUILD_CFLAGS += -O2 739else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 740KBUILD_CFLAGS += -O3 741else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 742KBUILD_CFLAGS += -Os 743endif 744 745# Tell gcc to never replace conditional load with a non-conditional one 746KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 747KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 748 749ifdef CONFIG_READABLE_ASM 750# Disable optimizations that make assembler listings hard to read. 751# reorder blocks reorders the control in the function 752# ipa clone creates specialized cloned functions 753# partial inlining inlines only parts of functions 754KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 755 $(call cc-option,-fno-ipa-cp-clone,) \ 756 $(call cc-option,-fno-partial-inlining) 757endif 758 759ifneq ($(CONFIG_FRAME_WARN),0) 760KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 761endif 762 763stackp-flags-y := -fno-stack-protector 764stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 765stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 766 767KBUILD_CFLAGS += $(stackp-flags-y) 768 769ifdef CONFIG_CC_IS_CLANG 770KBUILD_CPPFLAGS += -Qunused-arguments 771KBUILD_CFLAGS += -Wno-format-invalid-specifier 772KBUILD_CFLAGS += -Wno-gnu 773# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 774# source of a reference will be _MergedGlobals and not on of the whitelisted names. 775# See modpost pattern 2 776KBUILD_CFLAGS += -mno-global-merge 777else 778 779# These warnings generated too much noise in a regular build. 780# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 781KBUILD_CFLAGS += -Wno-unused-but-set-variable 782 783# Warn about unmarked fall-throughs in switch statement. 784# Disabled for clang while comment to attribute conversion happens and 785# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 786KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 787endif 788 789KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 790ifdef CONFIG_FRAME_POINTER 791KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 792else 793# Some targets (ARM with Thumb2, for example), can't be built with frame 794# pointers. For those, we don't have FUNCTION_TRACER automatically 795# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 796# incompatible with -fomit-frame-pointer with current GCC, so we don't use 797# -fomit-frame-pointer with FUNCTION_TRACER. 798ifndef CONFIG_FUNCTION_TRACER 799KBUILD_CFLAGS += -fomit-frame-pointer 800endif 801endif 802 803# Initialize all stack variables with a 0xAA pattern. 804ifdef CONFIG_INIT_STACK_ALL_PATTERN 805KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 806endif 807 808# Initialize all stack variables with a zero value. 809ifdef CONFIG_INIT_STACK_ALL_ZERO 810# Future support for zero initialization is still being debated, see 811# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 812# renamed or dropped. 813KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 814KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 815endif 816 817DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 818 819ifdef CONFIG_DEBUG_INFO 820 821ifdef CONFIG_DEBUG_INFO_SPLIT 822DEBUG_CFLAGS += -gsplit-dwarf 823else 824DEBUG_CFLAGS += -g 825endif 826 827KBUILD_AFLAGS += -Wa,-gdwarf-2 828 829ifdef CONFIG_DEBUG_INFO_DWARF4 830DEBUG_CFLAGS += -gdwarf-4 831endif 832 833ifdef CONFIG_DEBUG_INFO_REDUCED 834DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 835 $(call cc-option,-fno-var-tracking) 836endif 837 838ifdef CONFIG_DEBUG_INFO_COMPRESSED 839DEBUG_CFLAGS += -gz=zlib 840KBUILD_AFLAGS += -gz=zlib 841KBUILD_LDFLAGS += --compress-debug-sections=zlib 842endif 843 844endif # CONFIG_DEBUG_INFO 845 846KBUILD_CFLAGS += $(DEBUG_CFLAGS) 847export DEBUG_CFLAGS 848 849ifdef CONFIG_FUNCTION_TRACER 850ifdef CONFIG_FTRACE_MCOUNT_RECORD 851 # gcc 5 supports generating the mcount tables directly 852 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 853 CC_FLAGS_FTRACE += -mrecord-mcount 854 export CC_USING_RECORD_MCOUNT := 1 855 endif 856 ifdef CONFIG_HAVE_NOP_MCOUNT 857 ifeq ($(call cc-option-yn, -mnop-mcount),y) 858 CC_FLAGS_FTRACE += -mnop-mcount 859 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 860 endif 861 endif 862endif 863ifdef CONFIG_HAVE_FENTRY 864 ifeq ($(call cc-option-yn, -mfentry),y) 865 CC_FLAGS_FTRACE += -mfentry 866 CC_FLAGS_USING += -DCC_USING_FENTRY 867 endif 868endif 869export CC_FLAGS_FTRACE 870KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 871KBUILD_AFLAGS += $(CC_FLAGS_USING) 872ifdef CONFIG_DYNAMIC_FTRACE 873 ifdef CONFIG_HAVE_C_RECORDMCOUNT 874 BUILD_C_RECORDMCOUNT := y 875 export BUILD_C_RECORDMCOUNT 876 endif 877endif 878endif 879 880# We trigger additional mismatches with less inlining 881ifdef CONFIG_DEBUG_SECTION_MISMATCH 882KBUILD_CFLAGS += $(call cc-option, -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_LIVEPATCH 891KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 892endif 893 894ifdef CONFIG_SHADOW_CALL_STACK 895CC_FLAGS_SCS := -fsanitize=shadow-call-stack 896KBUILD_CFLAGS += $(CC_FLAGS_SCS) 897export CC_FLAGS_SCS 898endif 899 900ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 901KBUILD_CFLAGS += -falign-functions=32 902endif 903 904# arch Makefile may override CC so keep this after arch Makefile is included 905NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 906 907# warn about C99 declaration after statement 908KBUILD_CFLAGS += -Wdeclaration-after-statement 909 910# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 911KBUILD_CFLAGS += -Wvla 912 913# disable pointer signed / unsigned warnings in gcc 4.0 914KBUILD_CFLAGS += -Wno-pointer-sign 915 916# disable stringop warnings in gcc 8+ 917KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 918 919# We'll want to enable this eventually, but it's not going away for 5.7 at least 920KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 921KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 922KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 923 924# Another good warning that we'll want to enable eventually 925KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 926 927# Enabled with W=2, disabled by default as noisy 928KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 929 930# disable invalid "can't wrap" optimizations for signed / pointers 931KBUILD_CFLAGS += -fno-strict-overflow 932 933# clang sets -fmerge-all-constants by default as optimization, but this 934# is non-conforming behavior for C and in fact breaks the kernel, so we 935# need to disable it here generally. 936KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 937 938# for gcc -fno-merge-all-constants disables everything, but it is fine 939# to have actual conforming behavior enabled. 940KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 941 942# Make sure -fstack-check isn't enabled (like gentoo apparently did) 943KBUILD_CFLAGS += -fno-stack-check 944 945# conserve stack if available 946KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 947 948# Prohibit date/time macros, which would make the build non-deterministic 949KBUILD_CFLAGS += -Werror=date-time 950 951# enforce correct pointer usage 952KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 953 954# Require designated initializers for all marked structures 955KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 956 957# change __FILE__ to the relative path from the srctree 958KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 959 960# ensure -fcf-protection is disabled when using retpoline as it is 961# incompatible with -mindirect-branch=thunk-extern 962ifdef CONFIG_RETPOLINE 963KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 964endif 965 966# include additional Makefiles when needed 967include-y := scripts/Makefile.extrawarn 968include-$(CONFIG_KASAN) += scripts/Makefile.kasan 969include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 970include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 971include-$(CONFIG_KCOV) += scripts/Makefile.kcov 972include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 973 974include $(addprefix $(srctree)/, $(include-y)) 975 976# scripts/Makefile.gcc-plugins is intentionally included last. 977# Do not add $(call cc-option,...) below this line. When you build the kernel 978# from the clean source tree, the GCC plugins do not exist at this point. 979 980# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 981KBUILD_CPPFLAGS += $(KCPPFLAGS) 982KBUILD_AFLAGS += $(KAFLAGS) 983KBUILD_CFLAGS += $(KCFLAGS) 984 985KBUILD_LDFLAGS_MODULE += --build-id=sha1 986LDFLAGS_vmlinux += --build-id=sha1 987 988ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 989LDFLAGS_vmlinux += $(call ld-option, -X,) 990endif 991 992ifeq ($(CONFIG_RELR),y) 993LDFLAGS_vmlinux += --pack-dyn-relocs=relr 994endif 995 996# Align the bit size of userspace programs with the kernel 997KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 998KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 999 1000# make the checker run with the right architecture 1001CHECKFLAGS += --arch=$(ARCH) 1002 1003# insure the checker run with the right endianness 1004CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1005 1006# the checker needs the correct machine size 1007CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1008 1009# Default kernel image to build when no specific target is given. 1010# KBUILD_IMAGE may be overruled on the command line or 1011# set in the environment 1012# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1013# this default value 1014export KBUILD_IMAGE ?= vmlinux 1015 1016# 1017# INSTALL_PATH specifies where to place the updated kernel and system map 1018# images. Default is /boot, but you can set it to other values 1019export INSTALL_PATH ?= /boot 1020 1021# 1022# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1023# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1024# an argument if needed. Otherwise it defaults to the kernel install path 1025# 1026export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1027 1028# 1029# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1030# relocations required by build roots. This is not defined in the 1031# makefile but the argument can be passed to make if needed. 1032# 1033 1034MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1035export MODLIB 1036 1037# 1038# INSTALL_MOD_STRIP, if defined, will cause modules to be 1039# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1040# the default option --strip-debug will be used. Otherwise, 1041# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1042 1043ifdef INSTALL_MOD_STRIP 1044ifeq ($(INSTALL_MOD_STRIP),1) 1045mod_strip_cmd = $(STRIP) --strip-debug 1046else 1047mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1048endif # INSTALL_MOD_STRIP=1 1049else 1050mod_strip_cmd = true 1051endif # INSTALL_MOD_STRIP 1052export mod_strip_cmd 1053 1054# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1055# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1056# or CONFIG_MODULE_COMPRESS_XZ. 1057 1058mod_compress_cmd = true 1059ifdef CONFIG_MODULE_COMPRESS 1060 ifdef CONFIG_MODULE_COMPRESS_GZIP 1061 mod_compress_cmd = $(KGZIP) -n -f 1062 endif # CONFIG_MODULE_COMPRESS_GZIP 1063 ifdef CONFIG_MODULE_COMPRESS_XZ 1064 mod_compress_cmd = $(XZ) -f 1065 endif # CONFIG_MODULE_COMPRESS_XZ 1066endif # CONFIG_MODULE_COMPRESS 1067export mod_compress_cmd 1068 1069ifdef CONFIG_MODULE_SIG_ALL 1070$(eval $(call config_filename,MODULE_SIG_KEY)) 1071 1072mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1073else 1074mod_sign_cmd = true 1075endif 1076export mod_sign_cmd 1077 1078HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1079 1080has_libelf = $(call try-run,\ 1081 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1082 1083ifdef CONFIG_STACK_VALIDATION 1084 ifeq ($(has_libelf),1) 1085 objtool_target := tools/objtool FORCE 1086 else 1087 SKIP_STACK_VALIDATION := 1 1088 export SKIP_STACK_VALIDATION 1089 endif 1090endif 1091 1092ifdef CONFIG_DEBUG_INFO_BTF 1093 ifeq ($(has_libelf),1) 1094 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1095 else 1096 ERROR_RESOLVE_BTFIDS := 1 1097 endif 1098endif 1099 1100PHONY += prepare0 1101 1102export MODORDER := $(extmod-prefix)modules.order 1103export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1104 1105ifeq ($(KBUILD_EXTMOD),) 1106core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1107 1108vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1109 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1110 $(libs-y) $(libs-m))) 1111 1112vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1113 $(patsubst %/,%,$(filter %/, $(core-) \ 1114 $(drivers-) $(libs-)))) 1115 1116subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1117 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1118 $(drivers-y) $(drivers-m))) 1119 1120build-dirs := $(vmlinux-dirs) 1121clean-dirs := $(vmlinux-alldirs) 1122 1123# Externally visible symbols (used by link-vmlinux.sh) 1124KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1125KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1126ifdef CONFIG_MODULES 1127KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1128KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1129else 1130KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1131endif 1132KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1133 1134export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1135export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1136# used by scripts/Makefile.package 1137export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1138 1139vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1140 1141# Recurse until adjust_autoksyms.sh is satisfied 1142PHONY += autoksyms_recursive 1143ifdef CONFIG_TRIM_UNUSED_KSYMS 1144# For the kernel to actually contain only the needed exported symbols, 1145# we have to build modules as well to determine what those symbols are. 1146# (this can be evaluated only once include/config/auto.conf has been included) 1147KBUILD_MODULES := 1 1148 1149autoksyms_recursive: descend modules.order 1150 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1151 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1152endif 1153 1154autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1155 1156quiet_cmd_autoksyms_h = GEN $@ 1157 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1158 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1159 1160$(autoksyms_h): 1161 $(call cmd,autoksyms_h) 1162 1163ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1164 1165# Final link of vmlinux with optional arch pass after final link 1166cmd_link-vmlinux = \ 1167 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1168 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1169 1170vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1171 +$(call if_changed,link-vmlinux) 1172 1173targets := vmlinux 1174 1175# The actual objects are generated when descending, 1176# make sure no implicit rule kicks in 1177$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1178 1179filechk_kernel.release = \ 1180 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1181 1182# Store (new) KERNELRELEASE string in include/config/kernel.release 1183include/config/kernel.release: FORCE 1184 $(call filechk,kernel.release) 1185 1186# Additional helpers built in scripts/ 1187# Carefully list dependencies so we do not try to build scripts twice 1188# in parallel 1189PHONY += scripts 1190scripts: scripts_basic scripts_dtc 1191 $(Q)$(MAKE) $(build)=$(@) 1192 1193# Things we need to do before we recursively start building the kernel 1194# or the modules are listed in "prepare". 1195# A multi level approach is used. prepareN is processed before prepareN-1. 1196# archprepare is used in arch Makefiles and when processed asm symlink, 1197# version.h and scripts_basic is processed / created. 1198 1199PHONY += prepare archprepare 1200 1201archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1202 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1203 include/generated/autoconf.h 1204 1205prepare0: archprepare 1206 $(Q)$(MAKE) $(build)=scripts/mod 1207 $(Q)$(MAKE) $(build)=. 1208 1209# All the preparing.. 1210prepare: prepare0 prepare-objtool prepare-resolve_btfids 1211 1212# Support for using generic headers in asm-generic 1213asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1214 1215PHONY += asm-generic uapi-asm-generic 1216asm-generic: uapi-asm-generic 1217 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1218 generic=include/asm-generic 1219uapi-asm-generic: 1220 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1221 generic=include/uapi/asm-generic 1222 1223PHONY += prepare-objtool prepare-resolve_btfids 1224prepare-objtool: $(objtool_target) 1225ifeq ($(SKIP_STACK_VALIDATION),1) 1226ifdef CONFIG_UNWINDER_ORC 1227 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1228 @false 1229else 1230 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1231endif 1232endif 1233 1234prepare-resolve_btfids: $(resolve_btfids_target) 1235ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1236 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1237 @false 1238endif 1239# Generate some files 1240# --------------------------------------------------------------------------- 1241 1242# KERNELRELEASE can change from a few different places, meaning version.h 1243# needs to be updated, so this check is forced on all builds 1244 1245uts_len := 64 1246define filechk_utsrelease.h 1247 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1248 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1249 exit 1; \ 1250 fi; \ 1251 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1252endef 1253 1254define filechk_version.h 1255 echo \#define LINUX_VERSION_CODE $(shell \ 1256 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1257 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1258endef 1259 1260$(version_h): FORCE 1261 $(call filechk,version.h) 1262 $(Q)rm -f $(old_version_h) 1263 1264include/generated/utsrelease.h: include/config/kernel.release FORCE 1265 $(call filechk,utsrelease.h) 1266 1267PHONY += headerdep 1268headerdep: 1269 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1270 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1271 1272# --------------------------------------------------------------------------- 1273# Kernel headers 1274 1275#Default location for installed headers 1276export INSTALL_HDR_PATH = $(objtree)/usr 1277 1278quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1279 cmd_headers_install = \ 1280 mkdir -p $(INSTALL_HDR_PATH); \ 1281 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1282 usr/include $(INSTALL_HDR_PATH) 1283 1284PHONY += headers_install 1285headers_install: headers 1286 $(call cmd,headers_install) 1287 1288PHONY += archheaders archscripts 1289 1290hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1291 1292PHONY += headers 1293headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1294 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1295 $(error Headers not exportable for the $(SRCARCH) architecture)) 1296 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1297 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1298 1299# Deprecated. It is no-op now. 1300PHONY += headers_check 1301headers_check: 1302 @: 1303 1304ifdef CONFIG_HEADERS_INSTALL 1305prepare: headers 1306endif 1307 1308PHONY += scripts_unifdef 1309scripts_unifdef: scripts_basic 1310 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1311 1312# --------------------------------------------------------------------------- 1313# Kernel selftest 1314 1315PHONY += kselftest 1316kselftest: 1317 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1318 1319kselftest-%: FORCE 1320 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1321 1322PHONY += kselftest-merge 1323kselftest-merge: 1324 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1325 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1326 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1327 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1328 1329# --------------------------------------------------------------------------- 1330# Devicetree files 1331 1332ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1333dtstree := arch/$(SRCARCH)/boot/dts 1334endif 1335 1336ifneq ($(dtstree),) 1337 1338%.dtb: include/config/kernel.release scripts_dtc 1339 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1340 1341PHONY += dtbs dtbs_install dtbs_check 1342dtbs: include/config/kernel.release scripts_dtc 1343 $(Q)$(MAKE) $(build)=$(dtstree) 1344 1345ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1346export CHECK_DTBS=y 1347dtbs: dt_binding_check 1348endif 1349 1350dtbs_check: dtbs 1351 1352dtbs_install: 1353 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1354 1355ifdef CONFIG_OF_EARLY_FLATTREE 1356all: dtbs 1357endif 1358 1359endif 1360 1361PHONY += scripts_dtc 1362scripts_dtc: scripts_basic 1363 $(Q)$(MAKE) $(build)=scripts/dtc 1364 1365ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1366export CHECK_DT_BINDING=y 1367endif 1368 1369PHONY += dt_binding_check 1370dt_binding_check: scripts_dtc 1371 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1372 1373# --------------------------------------------------------------------------- 1374# Modules 1375 1376ifdef CONFIG_MODULES 1377 1378# By default, build modules as well 1379 1380all: modules 1381 1382# When we're building modules with modversions, we need to consider 1383# the built-in objects during the descend as well, in order to 1384# make sure the checksums are up to date before we record them. 1385ifdef CONFIG_MODVERSIONS 1386 KBUILD_BUILTIN := 1 1387endif 1388 1389# Build modules 1390# 1391# A module can be listed more than once in obj-m resulting in 1392# duplicate lines in modules.order files. Those are removed 1393# using awk while concatenating to the final file. 1394 1395PHONY += modules 1396modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1397 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1398 1399PHONY += modules_check 1400modules_check: modules.order 1401 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1402 1403cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1404 1405modules.order: $(subdir-modorder) FORCE 1406 $(call if_changed,modules_order) 1407 1408targets += modules.order 1409 1410# Target to prepare building external modules 1411PHONY += modules_prepare 1412modules_prepare: prepare 1413 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1414 1415# Target to install modules 1416PHONY += modules_install 1417modules_install: _modinst_ _modinst_post 1418 1419PHONY += _modinst_ 1420_modinst_: 1421 @rm -rf $(MODLIB)/kernel 1422 @rm -f $(MODLIB)/source 1423 @mkdir -p $(MODLIB)/kernel 1424 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1425 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1426 rm -f $(MODLIB)/build ; \ 1427 ln -s $(CURDIR) $(MODLIB)/build ; \ 1428 fi 1429 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1430 @cp -f modules.builtin $(MODLIB)/ 1431 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1433 1434# This depmod is only for convenience to give the initial 1435# boot a modules.dep even before / is mounted read-write. However the 1436# boot script depmod is the master version. 1437PHONY += _modinst_post 1438_modinst_post: _modinst_ 1439 $(call cmd,depmod) 1440 1441ifeq ($(CONFIG_MODULE_SIG), y) 1442PHONY += modules_sign 1443modules_sign: 1444 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1445endif 1446 1447else # CONFIG_MODULES 1448 1449# Modules not configured 1450# --------------------------------------------------------------------------- 1451 1452PHONY += modules modules_install 1453modules modules_install: 1454 @echo >&2 1455 @echo >&2 "The present kernel configuration has modules disabled." 1456 @echo >&2 "Type 'make config' and enable loadable module support." 1457 @echo >&2 "Then build a kernel with module support enabled." 1458 @echo >&2 1459 @exit 1 1460 1461endif # CONFIG_MODULES 1462 1463### 1464# Cleaning is done on three levels. 1465# make clean Delete most generated files 1466# Leave enough to build external modules 1467# make mrproper Delete the current configuration, and all generated files 1468# make distclean Remove editor backup files, patch leftover files and the like 1469 1470# Directories & files removed with 'make clean' 1471CLEAN_FILES += include/ksym vmlinux.symvers \ 1472 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1473 compile_commands.json 1474 1475# Directories & files removed with 'make mrproper' 1476MRPROPER_FILES += include/config include/generated \ 1477 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1478 debian snap tar-install \ 1479 .config .config.old .version \ 1480 Module.symvers \ 1481 signing_key.pem signing_key.priv signing_key.x509 \ 1482 x509.genkey extra_certificates signing_key.x509.keyid \ 1483 signing_key.x509.signer vmlinux-gdb.py \ 1484 *.spec 1485 1486# Directories & files removed with 'make distclean' 1487DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1488 1489# clean - Delete most, but leave enough to build external modules 1490# 1491clean: rm-files := $(CLEAN_FILES) 1492 1493PHONY += archclean vmlinuxclean 1494 1495vmlinuxclean: 1496 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1497 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1498 1499clean: archclean vmlinuxclean 1500 1501# mrproper - Delete all generated files, including .config 1502# 1503mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1504mrproper-dirs := $(addprefix _mrproper_,scripts) 1505 1506PHONY += $(mrproper-dirs) mrproper 1507$(mrproper-dirs): 1508 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1509 1510mrproper: clean $(mrproper-dirs) 1511 $(call cmd,rmfiles) 1512 1513# distclean 1514# 1515distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1516 1517PHONY += distclean 1518 1519distclean: mrproper 1520 $(call cmd,rmfiles) 1521 @find $(srctree) $(RCS_FIND_IGNORE) \ 1522 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1523 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1524 -o -name 'core' \) \ 1525 -type f -print | xargs rm -f 1526 1527 1528# Packaging of the kernel to various formats 1529# --------------------------------------------------------------------------- 1530 1531%src-pkg: FORCE 1532 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1533%pkg: include/config/kernel.release FORCE 1534 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1535 1536# Brief documentation of the typical targets used 1537# --------------------------------------------------------------------------- 1538 1539boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1540boards := $(sort $(notdir $(boards))) 1541board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1542board-dirs := $(sort $(notdir $(board-dirs:/=))) 1543 1544PHONY += help 1545help: 1546 @echo 'Cleaning targets:' 1547 @echo ' clean - Remove most generated files but keep the config and' 1548 @echo ' enough build support to build external modules' 1549 @echo ' mrproper - Remove all generated files + config + various backup files' 1550 @echo ' distclean - mrproper + remove editor backup and patch files' 1551 @echo '' 1552 @echo 'Configuration targets:' 1553 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1554 @echo '' 1555 @echo 'Other generic targets:' 1556 @echo ' all - Build all targets marked with [*]' 1557 @echo '* vmlinux - Build the bare kernel' 1558 @echo '* modules - Build all modules' 1559 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1560 @echo ' dir/ - Build all files in dir and below' 1561 @echo ' dir/file.[ois] - Build specified target only' 1562 @echo ' dir/file.ll - Build the LLVM assembly file' 1563 @echo ' (requires compiler support for LLVM assembly generation)' 1564 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1565 @echo ' (requires a recent binutils and recent build (System.map))' 1566 @echo ' dir/file.ko - Build module including final link' 1567 @echo ' modules_prepare - Set up for building external modules' 1568 @echo ' tags/TAGS - Generate tags file for editors' 1569 @echo ' cscope - Generate cscope index' 1570 @echo ' gtags - Generate GNU GLOBAL index' 1571 @echo ' kernelrelease - Output the release version string (use with make -s)' 1572 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1573 @echo ' image_name - Output the image name (use with make -s)' 1574 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1575 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1576 echo '' 1577 @echo 'Static analysers:' 1578 @echo ' checkstack - Generate a list of stack hogs' 1579 @echo ' namespacecheck - Name space analysis on compiled kernel' 1580 @echo ' versioncheck - Sanity check on version.h usage' 1581 @echo ' includecheck - Check for duplicate included header files' 1582 @echo ' export_report - List the usages of all exported symbols' 1583 @echo ' headerdep - Detect inclusion cycles in headers' 1584 @echo ' coccicheck - Check with Coccinelle' 1585 @echo ' clang-analyzer - Check with clang static analyzer' 1586 @echo ' clang-tidy - Check with clang-tidy' 1587 @echo '' 1588 @echo 'Tools:' 1589 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1590 @echo '' 1591 @echo 'Kernel selftest:' 1592 @echo ' kselftest - Build and run kernel selftest' 1593 @echo ' Build, install, and boot kernel before' 1594 @echo ' running kselftest on it' 1595 @echo ' Run as root for full coverage' 1596 @echo ' kselftest-all - Build kernel selftest' 1597 @echo ' kselftest-install - Build and install kernel selftest' 1598 @echo ' kselftest-clean - Remove all generated kselftest files' 1599 @echo ' kselftest-merge - Merge all the config dependencies of' 1600 @echo ' kselftest to existing .config.' 1601 @echo '' 1602 @$(if $(dtstree), \ 1603 echo 'Devicetree:'; \ 1604 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1605 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1606 echo ' dt_binding_check - Validate device tree binding documents'; \ 1607 echo ' dtbs_check - Validate device tree source files';\ 1608 echo '') 1609 1610 @echo 'Userspace tools targets:' 1611 @echo ' use "make tools/help"' 1612 @echo ' or "cd tools; make help"' 1613 @echo '' 1614 @echo 'Kernel packaging:' 1615 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1616 @echo '' 1617 @echo 'Documentation targets:' 1618 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1619 @echo '' 1620 @echo 'Architecture specific targets ($(SRCARCH)):' 1621 @$(if $(archhelp),$(archhelp),\ 1622 echo ' No architecture specific help defined for $(SRCARCH)') 1623 @echo '' 1624 @$(if $(boards), \ 1625 $(foreach b, $(boards), \ 1626 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1627 echo '') 1628 @$(if $(board-dirs), \ 1629 $(foreach b, $(board-dirs), \ 1630 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1631 printf " %-16s - Show all of the above\\n" help-boards; \ 1632 echo '') 1633 1634 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1635 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1636 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1637 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1638 @echo ' (sparse by default)' 1639 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1640 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1641 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1642 @echo ' 1: warnings which may be relevant and do not occur too often' 1643 @echo ' 2: warnings which occur quite often but may still be relevant' 1644 @echo ' 3: more obscure warnings, can most likely be ignored' 1645 @echo ' Multiple levels can be combined with W=12 or W=123' 1646 @echo '' 1647 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1648 @echo 'For further info see the ./README file' 1649 1650 1651help-board-dirs := $(addprefix help-,$(board-dirs)) 1652 1653help-boards: $(help-board-dirs) 1654 1655boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1656 1657$(help-board-dirs): help-%: 1658 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1659 @$(if $(boards-per-dir), \ 1660 $(foreach b, $(boards-per-dir), \ 1661 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1662 echo '') 1663 1664 1665# Documentation targets 1666# --------------------------------------------------------------------------- 1667DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1668 linkcheckdocs dochelp refcheckdocs 1669PHONY += $(DOC_TARGETS) 1670$(DOC_TARGETS): 1671 $(Q)$(MAKE) $(build)=Documentation $@ 1672 1673# Misc 1674# --------------------------------------------------------------------------- 1675 1676PHONY += scripts_gdb 1677scripts_gdb: prepare0 1678 $(Q)$(MAKE) $(build)=scripts/gdb 1679 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1680 1681ifdef CONFIG_GDB_SCRIPTS 1682all: scripts_gdb 1683endif 1684 1685else # KBUILD_EXTMOD 1686 1687### 1688# External module support. 1689# When building external modules the kernel used as basis is considered 1690# read-only, and no consistency checks are made and the make 1691# system is not used on the basis kernel. If updates are required 1692# in the basis kernel ordinary make commands (without M=...) must 1693# be used. 1694# 1695# The following are the only valid targets when building external 1696# modules. 1697# make M=dir clean Delete all automatically generated files 1698# make M=dir modules Make all modules in specified dir 1699# make M=dir Same as 'make M=dir modules' 1700# make M=dir modules_install 1701# Install the modules built in the module directory 1702# Assumes install directory is already created 1703 1704# We are always building only modules. 1705KBUILD_BUILTIN := 1706KBUILD_MODULES := 1 1707 1708build-dirs := $(KBUILD_EXTMOD) 1709PHONY += modules 1710modules: $(MODORDER) 1711 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1712 1713$(MODORDER): descend 1714 @: 1715 1716PHONY += modules_install 1717modules_install: _emodinst_ _emodinst_post 1718 1719install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1720PHONY += _emodinst_ 1721_emodinst_: 1722 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1723 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1724 1725PHONY += _emodinst_post 1726_emodinst_post: _emodinst_ 1727 $(call cmd,depmod) 1728 1729compile_commands.json: $(extmod-prefix)compile_commands.json 1730PHONY += compile_commands.json 1731 1732clean-dirs := $(KBUILD_EXTMOD) 1733clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1734 $(KBUILD_EXTMOD)/compile_commands.json 1735 1736PHONY += help 1737help: 1738 @echo ' Building external modules.' 1739 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1740 @echo '' 1741 @echo ' modules - default target, build the module(s)' 1742 @echo ' modules_install - install the module' 1743 @echo ' clean - remove generated files in module directory only' 1744 @echo '' 1745 1746# no-op for external module builds 1747PHONY += prepare modules_prepare 1748 1749endif # KBUILD_EXTMOD 1750 1751# Single targets 1752# --------------------------------------------------------------------------- 1753# To build individual files in subdirectories, you can do like this: 1754# 1755# make foo/bar/baz.s 1756# 1757# The supported suffixes for single-target are listed in 'single-targets' 1758# 1759# To build only under specific subdirectories, you can do like this: 1760# 1761# make foo/bar/baz/ 1762 1763ifdef single-build 1764 1765# .ko is special because modpost is needed 1766single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1767single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1768 1769$(single-ko): single_modpost 1770 @: 1771$(single-no-ko): descend 1772 @: 1773 1774ifeq ($(KBUILD_EXTMOD),) 1775# For the single build of in-tree modules, use a temporary file to avoid 1776# the situation of modules_install installing an invalid modules.order. 1777MODORDER := .modules.tmp 1778endif 1779 1780PHONY += single_modpost 1781single_modpost: $(single-no-ko) modules_prepare 1782 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1783 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1784 1785KBUILD_MODULES := 1 1786 1787export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1788 1789# trim unrelated directories 1790build-dirs := $(foreach d, $(build-dirs), \ 1791 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1792 1793endif 1794 1795ifndef CONFIG_MODULES 1796KBUILD_MODULES := 1797endif 1798 1799# Handle descending into subdirectories listed in $(build-dirs) 1800# Preset locale variables to speed up the build process. Limit locale 1801# tweaks to this spot to avoid wrong language settings when running 1802# make menuconfig etc. 1803# Error messages still appears in the original language 1804PHONY += descend $(build-dirs) 1805descend: $(build-dirs) 1806$(build-dirs): prepare 1807 $(Q)$(MAKE) $(build)=$@ \ 1808 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1809 need-builtin=1 need-modorder=1 1810 1811clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1812PHONY += $(clean-dirs) clean 1813$(clean-dirs): 1814 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1815 1816clean: $(clean-dirs) 1817 $(call cmd,rmfiles) 1818 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1819 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1820 -o -name '*.ko.*' \ 1821 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1822 -o -name '*.dwo' -o -name '*.lst' \ 1823 -o -name '*.su' -o -name '*.mod' \ 1824 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1825 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1826 -o -name '*.asn1.[ch]' \ 1827 -o -name '*.symtypes' -o -name 'modules.order' \ 1828 -o -name '.tmp_*.o.*' \ 1829 -o -name '*.c.[012]*.*' \ 1830 -o -name '*.ll' \ 1831 -o -name '*.gcno' \) -type f -print | xargs rm -f 1832 1833# Generate tags for editors 1834# --------------------------------------------------------------------------- 1835quiet_cmd_tags = GEN $@ 1836 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1837 1838tags TAGS cscope gtags: FORCE 1839 $(call cmd,tags) 1840 1841# Script to generate missing namespace dependencies 1842# --------------------------------------------------------------------------- 1843 1844PHONY += nsdeps 1845nsdeps: export KBUILD_NSDEPS=1 1846nsdeps: modules 1847 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1848 1849# Clang Tooling 1850# --------------------------------------------------------------------------- 1851 1852quiet_cmd_gen_compile_commands = GEN $@ 1853 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1854 1855$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1856 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1857 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1858 $(call if_changed,gen_compile_commands) 1859 1860targets += $(extmod-prefix)compile_commands.json 1861 1862PHONY += clang-tidy clang-analyzer 1863 1864ifdef CONFIG_CC_IS_CLANG 1865quiet_cmd_clang_tools = CHECK $< 1866 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1867 1868clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1869 $(call cmd,clang_tools) 1870else 1871clang-tidy clang-analyzer: 1872 @echo "$@ requires CC=clang" >&2 1873 @false 1874endif 1875 1876# Scripts to check various things for consistency 1877# --------------------------------------------------------------------------- 1878 1879PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1880 1881includecheck: 1882 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1883 -name '*.[hcS]' -type f -print | sort \ 1884 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1885 1886versioncheck: 1887 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1888 -name '*.[hcS]' -type f -print | sort \ 1889 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1890 1891coccicheck: 1892 $(Q)$(BASH) $(srctree)/scripts/$@ 1893 1894namespacecheck: 1895 $(PERL) $(srctree)/scripts/namespace.pl 1896 1897export_report: 1898 $(PERL) $(srctree)/scripts/export_report.pl 1899 1900PHONY += checkstack kernelrelease kernelversion image_name 1901 1902# UML needs a little special treatment here. It wants to use the host 1903# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1904# else wants $(ARCH), including people doing cross-builds, which means 1905# that $(SUBARCH) doesn't work here. 1906ifeq ($(ARCH), um) 1907CHECKSTACK_ARCH := $(SUBARCH) 1908else 1909CHECKSTACK_ARCH := $(ARCH) 1910endif 1911checkstack: 1912 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1913 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1914 1915kernelrelease: 1916 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1917 1918kernelversion: 1919 @echo $(KERNELVERSION) 1920 1921image_name: 1922 @echo $(KBUILD_IMAGE) 1923 1924# Clear a bunch of variables before executing the submake 1925 1926ifeq ($(quiet),silent_) 1927tools_silent=s 1928endif 1929 1930tools/: FORCE 1931 $(Q)mkdir -p $(objtree)/tools 1932 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1933 1934tools/%: FORCE 1935 $(Q)mkdir -p $(objtree)/tools 1936 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1937 1938quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1939 cmd_rmfiles = rm -rf $(rm-files) 1940 1941# Run depmod only if we have System.map and depmod is executable 1942quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1943 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1944 $(KERNELRELEASE) 1945 1946# read saved command lines for existing targets 1947existing-targets := $(wildcard $(sort $(targets))) 1948 1949-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1950 1951endif # config-build 1952endif # mixed-build 1953endif # need-sub-make 1954 1955PHONY += FORCE 1956FORCE: 1957 1958# Declare the contents of the PHONY variable as phony. We keep that 1959# information in a variable so we can use it in if_changed and friends. 1960.PHONY: $(PHONY) 1961