1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 8 4SUBLEVEL = 0 5EXTRAVERSION = 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 := $(no-dot-config-targets) install %install \ 269 kernelrelease 270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 271 272config-build := 273mixed-build := 274need-config := 1 275may-sync-config := 1 276single-build := 277 278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 280 need-config := 281 endif 282endif 283 284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 286 may-sync-config := 287 endif 288endif 289 290ifneq ($(KBUILD_EXTMOD),) 291 may-sync-config := 292endif 293 294ifeq ($(KBUILD_EXTMOD),) 295 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 296 config-build := 1 297 ifneq ($(words $(MAKECMDGOALS)),1) 298 mixed-build := 1 299 endif 300 endif 301endif 302 303# We cannot build single targets and the others at the same time 304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 305 single-build := 1 306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 307 mixed-build := 1 308 endif 309endif 310 311# For "make -j clean all", "make -j mrproper defconfig all", etc. 312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 314 mixed-build := 1 315 endif 316endif 317 318# install and modules_install need also be processed one by one 319ifneq ($(filter install,$(MAKECMDGOALS)),) 320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325ifdef mixed-build 326# =========================================================================== 327# We're called with mixed targets (*config and build targets). 328# Handle them one by one. 329 330PHONY += $(MAKECMDGOALS) __build_one_by_one 331 332$(MAKECMDGOALS): __build_one_by_one 333 @: 334 335__build_one_by_one: 336 $(Q)set -e; \ 337 for i in $(MAKECMDGOALS); do \ 338 $(MAKE) -f $(srctree)/Makefile $$i; \ 339 done 340 341else # !mixed-build 342 343include scripts/Kbuild.include 344 345# Read KERNELRELEASE from include/config/kernel.release (if it exists) 346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 349 350include scripts/subarch.include 351 352# Cross compiling and selecting different set of gcc/bin-utils 353# --------------------------------------------------------------------------- 354# 355# When performing cross compilation for other architectures ARCH shall be set 356# to the target architecture. (See arch/* for the possibilities). 357# ARCH can be set during invocation of make: 358# make ARCH=ia64 359# Another way is to have ARCH set in the environment. 360# The default ARCH is the host where make is executed. 361 362# CROSS_COMPILE specify the prefix used for all executables used 363# during compilation. Only gcc and related bin-utils executables 364# are prefixed with $(CROSS_COMPILE). 365# CROSS_COMPILE can be set on the command line 366# make CROSS_COMPILE=ia64-linux- 367# Alternatively CROSS_COMPILE can be set in the environment. 368# Default value for CROSS_COMPILE is not to prefix executables 369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 370ARCH ?= $(SUBARCH) 371 372# Architecture as present in compile.h 373UTS_MACHINE := $(ARCH) 374SRCARCH := $(ARCH) 375 376# Additional ARCH settings for x86 377ifeq ($(ARCH),i386) 378 SRCARCH := x86 379endif 380ifeq ($(ARCH),x86_64) 381 SRCARCH := x86 382endif 383 384# Additional ARCH settings for sparc 385ifeq ($(ARCH),sparc32) 386 SRCARCH := sparc 387endif 388ifeq ($(ARCH),sparc64) 389 SRCARCH := sparc 390endif 391 392# Additional ARCH settings for sh 393ifeq ($(ARCH),sh64) 394 SRCARCH := sh 395endif 396 397KCONFIG_CONFIG ?= .config 398export KCONFIG_CONFIG 399 400# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 401export KBUILD_DEFCONFIG := defconfig 402 403# SHELL used by kbuild 404CONFIG_SHELL := sh 405 406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 409 410ifneq ($(LLVM),) 411HOSTCC = clang 412HOSTCXX = clang++ 413else 414HOSTCC = gcc 415HOSTCXX = g++ 416endif 417 418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 419 -O2 -fomit-frame-pointer -std=gnu89 420export KBUILD_USERLDFLAGS := 421 422KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 424KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 425KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 426 427# Make variables (CC, etc...) 428CPP = $(CC) -E 429ifneq ($(LLVM),) 430CC = clang 431LD = ld.lld 432AR = llvm-ar 433NM = llvm-nm 434OBJCOPY = llvm-objcopy 435OBJDUMP = llvm-objdump 436READELF = llvm-readelf 437OBJSIZE = llvm-size 438STRIP = llvm-strip 439else 440CC = $(CROSS_COMPILE)gcc 441LD = $(CROSS_COMPILE)ld 442AR = $(CROSS_COMPILE)ar 443NM = $(CROSS_COMPILE)nm 444OBJCOPY = $(CROSS_COMPILE)objcopy 445OBJDUMP = $(CROSS_COMPILE)objdump 446READELF = $(CROSS_COMPILE)readelf 447OBJSIZE = $(CROSS_COMPILE)size 448STRIP = $(CROSS_COMPILE)strip 449endif 450PAHOLE = pahole 451RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 452LEX = flex 453YACC = bison 454AWK = awk 455INSTALLKERNEL := installkernel 456DEPMOD = /sbin/depmod 457PERL = perl 458PYTHON = python 459PYTHON3 = python3 460CHECK = sparse 461BASH = bash 462KGZIP = gzip 463KBZIP2 = bzip2 464KLZOP = lzop 465LZMA = lzma 466LZ4 = lz4c 467XZ = xz 468ZSTD = zstd 469 470CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 471 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 472NOSTDINC_FLAGS := 473CFLAGS_MODULE = 474AFLAGS_MODULE = 475LDFLAGS_MODULE = 476CFLAGS_KERNEL = 477AFLAGS_KERNEL = 478LDFLAGS_vmlinux = 479 480# Use USERINCLUDE when you must reference the UAPI directories only. 481USERINCLUDE := \ 482 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 483 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 484 -I$(srctree)/include/uapi \ 485 -I$(objtree)/include/generated/uapi \ 486 -include $(srctree)/include/linux/kconfig.h 487 488# Use LINUXINCLUDE when you must reference the include/ directory. 489# Needed to be compatible with the O= option 490LINUXINCLUDE := \ 491 -I$(srctree)/arch/$(SRCARCH)/include \ 492 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 493 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 494 -I$(objtree)/include \ 495 $(USERINCLUDE) 496 497KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 498KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 499 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 500 -Werror=implicit-function-declaration -Werror=implicit-int \ 501 -Wno-format-security \ 502 -std=gnu89 503KBUILD_CPPFLAGS := -D__KERNEL__ 504KBUILD_AFLAGS_KERNEL := 505KBUILD_CFLAGS_KERNEL := 506KBUILD_AFLAGS_MODULE := -DMODULE 507KBUILD_CFLAGS_MODULE := -DMODULE 508KBUILD_LDFLAGS_MODULE := 509export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 510KBUILD_LDFLAGS := 511CLANG_FLAGS := 512 513export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 514export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 515export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 516export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 517export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 518 519export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 520export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 521export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN 522export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 523export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 524export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 525 526# Files to ignore in find ... statements 527 528export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 529 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 530 -prune -o 531export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 532 --exclude CVS --exclude .pc --exclude .hg --exclude .git 533 534# =========================================================================== 535# Rules shared between *config targets and build targets 536 537# Basic helpers built in scripts/basic/ 538PHONY += scripts_basic 539scripts_basic: 540 $(Q)$(MAKE) $(build)=scripts/basic 541 $(Q)rm -f .tmp_quiet_recordmcount 542 543PHONY += outputmakefile 544# Before starting out-of-tree build, make sure the source tree is clean. 545# outputmakefile generates a Makefile in the output directory, if using a 546# separate output directory. This allows convenient use of make in the 547# output directory. 548# At the same time when output Makefile generated, generate .gitignore to 549# ignore whole output directory 550outputmakefile: 551ifdef building_out_of_srctree 552 $(Q)if [ -f $(srctree)/.config -o \ 553 -d $(srctree)/include/config -o \ 554 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 555 echo >&2 "***"; \ 556 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 557 echo >&2 "*** in $(abs_srctree)";\ 558 echo >&2 "***"; \ 559 false; \ 560 fi 561 $(Q)ln -fsn $(srctree) source 562 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 563 $(Q)test -e .gitignore || \ 564 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 565endif 566 567ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 568ifneq ($(CROSS_COMPILE),) 569CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 570GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 571CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 572GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 573endif 574ifneq ($(GCC_TOOLCHAIN),) 575CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 576endif 577ifneq ($(LLVM_IAS),1) 578CLANG_FLAGS += -no-integrated-as 579endif 580CLANG_FLAGS += -Werror=unknown-warning-option 581KBUILD_CFLAGS += $(CLANG_FLAGS) 582KBUILD_AFLAGS += $(CLANG_FLAGS) 583export CLANG_FLAGS 584endif 585 586# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 587# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 588# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 589# and from include/config/auto.conf.cmd to detect the compiler upgrade. 590CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 591 592ifdef config-build 593# =========================================================================== 594# *config targets only - make sure prerequisites are updated, and descend 595# in scripts/kconfig to make the *config target 596 597# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 598# KBUILD_DEFCONFIG may point out an alternative default configuration 599# used for 'make defconfig' 600include arch/$(SRCARCH)/Makefile 601export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 602 603config: outputmakefile scripts_basic FORCE 604 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 605 606%config: outputmakefile scripts_basic FORCE 607 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 608 609else #!config-build 610# =========================================================================== 611# Build targets only - this includes vmlinux, arch specific targets, clean 612# targets and others. In general all targets except *config targets. 613 614# If building an external module we do not care about the all: rule 615# but instead __all depend on modules 616PHONY += all 617ifeq ($(KBUILD_EXTMOD),) 618__all: all 619else 620__all: modules 621endif 622 623# Decide whether to build built-in, modular, or both. 624# Normally, just do built-in. 625 626KBUILD_MODULES := 627KBUILD_BUILTIN := 1 628 629# If we have only "make modules", don't compile built-in objects. 630ifeq ($(MAKECMDGOALS),modules) 631 KBUILD_BUILTIN := 632endif 633 634# If we have "make <whatever> modules", compile modules 635# in addition to whatever we do anyway. 636# Just "make" or "make all" shall build modules as well 637 638ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 639 KBUILD_MODULES := 1 640endif 641 642ifeq ($(MAKECMDGOALS),) 643 KBUILD_MODULES := 1 644endif 645 646export KBUILD_MODULES KBUILD_BUILTIN 647 648ifdef need-config 649include include/config/auto.conf 650endif 651 652ifeq ($(KBUILD_EXTMOD),) 653# Objects we will link into vmlinux / subdirs we need to visit 654core-y := init/ usr/ 655drivers-y := drivers/ sound/ 656drivers-$(CONFIG_SAMPLES) += samples/ 657drivers-y += net/ virt/ 658libs-y := lib/ 659endif # KBUILD_EXTMOD 660 661# The all: target is the default when no target is given on the 662# command line. 663# This allow a user to issue only 'make' to build a kernel including modules 664# Defaults to vmlinux, but the arch makefile usually adds further targets 665all: vmlinux 666 667CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 668 $(call cc-option,-fno-tree-loop-im) \ 669 $(call cc-disable-warning,maybe-uninitialized,) 670export CFLAGS_GCOV 671 672# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 673ifdef CONFIG_FUNCTION_TRACER 674 CC_FLAGS_FTRACE := -pg 675endif 676 677RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 678RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 679RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 680RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 681RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 682RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 683export RETPOLINE_CFLAGS 684export RETPOLINE_VDSO_CFLAGS 685 686include arch/$(SRCARCH)/Makefile 687 688ifdef need-config 689ifdef may-sync-config 690# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 691# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 692# because some architectures define CROSS_COMPILE there. 693include include/config/auto.conf.cmd 694 695$(KCONFIG_CONFIG): 696 @echo >&2 '***' 697 @echo >&2 '*** Configuration file "$@" not found!' 698 @echo >&2 '***' 699 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 700 @echo >&2 '*** "make menuconfig" or "make xconfig").' 701 @echo >&2 '***' 702 @/bin/false 703 704# The actual configuration files used during the build are stored in 705# include/generated/ and include/config/. Update them if .config is newer than 706# include/config/auto.conf (which mirrors .config). 707# 708# This exploits the 'multi-target pattern rule' trick. 709# The syncconfig should be executed only once to make all the targets. 710# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 711%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 712 $(Q)$(MAKE) -f $(srctree)/Makefile 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 820ifdef CONFIG_DEBUG_INFO_SPLIT 821DEBUG_CFLAGS += -gsplit-dwarf 822else 823DEBUG_CFLAGS += -g 824endif 825KBUILD_AFLAGS += -Wa,-gdwarf-2 826endif 827ifdef CONFIG_DEBUG_INFO_DWARF4 828DEBUG_CFLAGS += -gdwarf-4 829endif 830 831ifdef CONFIG_DEBUG_INFO_REDUCED 832DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 833 $(call cc-option,-fno-var-tracking) 834endif 835 836ifdef CONFIG_DEBUG_INFO_COMPRESSED 837DEBUG_CFLAGS += -gz=zlib 838KBUILD_AFLAGS += -gz=zlib 839KBUILD_LDFLAGS += --compress-debug-sections=zlib 840endif 841 842KBUILD_CFLAGS += $(DEBUG_CFLAGS) 843export DEBUG_CFLAGS 844 845ifdef CONFIG_FUNCTION_TRACER 846ifdef CONFIG_FTRACE_MCOUNT_RECORD 847 # gcc 5 supports generating the mcount tables directly 848 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 849 CC_FLAGS_FTRACE += -mrecord-mcount 850 export CC_USING_RECORD_MCOUNT := 1 851 endif 852 ifdef CONFIG_HAVE_NOP_MCOUNT 853 ifeq ($(call cc-option-yn, -mnop-mcount),y) 854 CC_FLAGS_FTRACE += -mnop-mcount 855 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 856 endif 857 endif 858endif 859ifdef CONFIG_HAVE_FENTRY 860 ifeq ($(call cc-option-yn, -mfentry),y) 861 CC_FLAGS_FTRACE += -mfentry 862 CC_FLAGS_USING += -DCC_USING_FENTRY 863 endif 864endif 865export CC_FLAGS_FTRACE 866KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 867KBUILD_AFLAGS += $(CC_FLAGS_USING) 868ifdef CONFIG_DYNAMIC_FTRACE 869 ifdef CONFIG_HAVE_C_RECORDMCOUNT 870 BUILD_C_RECORDMCOUNT := y 871 export BUILD_C_RECORDMCOUNT 872 endif 873endif 874endif 875 876# We trigger additional mismatches with less inlining 877ifdef CONFIG_DEBUG_SECTION_MISMATCH 878KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 879endif 880 881ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 882KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 883LDFLAGS_vmlinux += --gc-sections 884endif 885 886ifdef CONFIG_LIVEPATCH 887KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 888endif 889 890ifdef CONFIG_SHADOW_CALL_STACK 891CC_FLAGS_SCS := -fsanitize=shadow-call-stack 892KBUILD_CFLAGS += $(CC_FLAGS_SCS) 893export CC_FLAGS_SCS 894endif 895 896ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 897KBUILD_CFLAGS += -falign-functions=32 898endif 899 900# arch Makefile may override CC so keep this after arch Makefile is included 901NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 902 903# warn about C99 declaration after statement 904KBUILD_CFLAGS += -Wdeclaration-after-statement 905 906# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 907KBUILD_CFLAGS += -Wvla 908 909# disable pointer signed / unsigned warnings in gcc 4.0 910KBUILD_CFLAGS += -Wno-pointer-sign 911 912# disable stringop warnings in gcc 8+ 913KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 914 915# We'll want to enable this eventually, but it's not going away for 5.7 at least 916KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 917KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 918KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 919 920# Another good warning that we'll want to enable eventually 921KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 922 923# Enabled with W=2, disabled by default as noisy 924KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 925 926# disable invalid "can't wrap" optimizations for signed / pointers 927KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 928 929# clang sets -fmerge-all-constants by default as optimization, but this 930# is non-conforming behavior for C and in fact breaks the kernel, so we 931# need to disable it here generally. 932KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 933 934# for gcc -fno-merge-all-constants disables everything, but it is fine 935# to have actual conforming behavior enabled. 936KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 937 938# Make sure -fstack-check isn't enabled (like gentoo apparently did) 939KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 940 941# conserve stack if available 942KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 943 944# Prohibit date/time macros, which would make the build non-deterministic 945KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 946 947# enforce correct pointer usage 948KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 949 950# Require designated initializers for all marked structures 951KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 952 953# change __FILE__ to the relative path from the srctree 954KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 955 956# ensure -fcf-protection is disabled when using retpoline as it is 957# incompatible with -mindirect-branch=thunk-extern 958ifdef CONFIG_RETPOLINE 959KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 960endif 961 962# include additional Makefiles when needed 963include-y := scripts/Makefile.extrawarn 964include-$(CONFIG_KASAN) += scripts/Makefile.kasan 965include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 966include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 967include-$(CONFIG_KCOV) += scripts/Makefile.kcov 968include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 969 970include $(addprefix $(srctree)/, $(include-y)) 971 972# scripts/Makefile.gcc-plugins is intentionally included last. 973# Do not add $(call cc-option,...) below this line. When you build the kernel 974# from the clean source tree, the GCC plugins do not exist at this point. 975 976# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 977KBUILD_CPPFLAGS += $(KCPPFLAGS) 978KBUILD_AFLAGS += $(KAFLAGS) 979KBUILD_CFLAGS += $(KCFLAGS) 980 981KBUILD_LDFLAGS_MODULE += --build-id 982LDFLAGS_vmlinux += --build-id 983 984ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 985LDFLAGS_vmlinux += $(call ld-option, -X,) 986endif 987 988ifeq ($(CONFIG_RELR),y) 989LDFLAGS_vmlinux += --pack-dyn-relocs=relr 990endif 991 992# Align the bit size of userspace programs with the kernel 993KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 994KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 995 996# make the checker run with the right architecture 997CHECKFLAGS += --arch=$(ARCH) 998 999# insure the checker run with the right endianness 1000CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1001 1002# the checker needs the correct machine size 1003CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1004 1005# Default kernel image to build when no specific target is given. 1006# KBUILD_IMAGE may be overruled on the command line or 1007# set in the environment 1008# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1009# this default value 1010export KBUILD_IMAGE ?= vmlinux 1011 1012# 1013# INSTALL_PATH specifies where to place the updated kernel and system map 1014# images. Default is /boot, but you can set it to other values 1015export INSTALL_PATH ?= /boot 1016 1017# 1018# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1019# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1020# an argument if needed. Otherwise it defaults to the kernel install path 1021# 1022export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1023 1024# 1025# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1026# relocations required by build roots. This is not defined in the 1027# makefile but the argument can be passed to make if needed. 1028# 1029 1030MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1031export MODLIB 1032 1033# 1034# INSTALL_MOD_STRIP, if defined, will cause modules to be 1035# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1036# the default option --strip-debug will be used. Otherwise, 1037# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1038 1039ifdef INSTALL_MOD_STRIP 1040ifeq ($(INSTALL_MOD_STRIP),1) 1041mod_strip_cmd = $(STRIP) --strip-debug 1042else 1043mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1044endif # INSTALL_MOD_STRIP=1 1045else 1046mod_strip_cmd = true 1047endif # INSTALL_MOD_STRIP 1048export mod_strip_cmd 1049 1050# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1051# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1052# or CONFIG_MODULE_COMPRESS_XZ. 1053 1054mod_compress_cmd = true 1055ifdef CONFIG_MODULE_COMPRESS 1056 ifdef CONFIG_MODULE_COMPRESS_GZIP 1057 mod_compress_cmd = $(KGZIP) -n -f 1058 endif # CONFIG_MODULE_COMPRESS_GZIP 1059 ifdef CONFIG_MODULE_COMPRESS_XZ 1060 mod_compress_cmd = $(XZ) -f 1061 endif # CONFIG_MODULE_COMPRESS_XZ 1062endif # CONFIG_MODULE_COMPRESS 1063export mod_compress_cmd 1064 1065ifdef CONFIG_MODULE_SIG_ALL 1066$(eval $(call config_filename,MODULE_SIG_KEY)) 1067 1068mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1069else 1070mod_sign_cmd = true 1071endif 1072export mod_sign_cmd 1073 1074HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1075 1076has_libelf = $(call try-run,\ 1077 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1078 1079ifdef CONFIG_STACK_VALIDATION 1080 ifeq ($(has_libelf),1) 1081 objtool_target := tools/objtool FORCE 1082 else 1083 SKIP_STACK_VALIDATION := 1 1084 export SKIP_STACK_VALIDATION 1085 endif 1086endif 1087 1088ifdef CONFIG_DEBUG_INFO_BTF 1089 ifeq ($(has_libelf),1) 1090 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1091 else 1092 ERROR_RESOLVE_BTFIDS := 1 1093 endif 1094endif 1095 1096PHONY += prepare0 1097 1098export MODORDER := $(extmod-prefix)modules.order 1099export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1100 1101ifeq ($(KBUILD_EXTMOD),) 1102core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1103 1104vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1105 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1106 $(libs-y) $(libs-m))) 1107 1108vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1109 $(patsubst %/,%,$(filter %/, $(core-) \ 1110 $(drivers-) $(libs-)))) 1111 1112subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1113 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1114 $(drivers-y) $(drivers-m))) 1115 1116build-dirs := $(vmlinux-dirs) 1117clean-dirs := $(vmlinux-alldirs) 1118 1119# Externally visible symbols (used by link-vmlinux.sh) 1120KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1121KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1122ifdef CONFIG_MODULES 1123KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1124KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1125else 1126KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1127endif 1128KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1129 1130export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1131export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1132# used by scripts/Makefile.package 1133export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1134 1135vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1136 1137# Recurse until adjust_autoksyms.sh is satisfied 1138PHONY += autoksyms_recursive 1139ifdef CONFIG_TRIM_UNUSED_KSYMS 1140# For the kernel to actually contain only the needed exported symbols, 1141# we have to build modules as well to determine what those symbols are. 1142# (this can be evaluated only once include/config/auto.conf has been included) 1143KBUILD_MODULES := 1 1144 1145autoksyms_recursive: descend modules.order 1146 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1147 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1148endif 1149 1150autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1151 1152quiet_cmd_autoksyms_h = GEN $@ 1153 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1154 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1155 1156$(autoksyms_h): 1157 $(call cmd,autoksyms_h) 1158 1159ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1160 1161# Final link of vmlinux with optional arch pass after final link 1162cmd_link-vmlinux = \ 1163 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1164 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1165 1166vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1167 +$(call if_changed,link-vmlinux) 1168 1169targets := vmlinux 1170 1171# The actual objects are generated when descending, 1172# make sure no implicit rule kicks in 1173$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1174 1175filechk_kernel.release = \ 1176 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1177 1178# Store (new) KERNELRELEASE string in include/config/kernel.release 1179include/config/kernel.release: FORCE 1180 $(call filechk,kernel.release) 1181 1182# Additional helpers built in scripts/ 1183# Carefully list dependencies so we do not try to build scripts twice 1184# in parallel 1185PHONY += scripts 1186scripts: scripts_basic scripts_dtc 1187 $(Q)$(MAKE) $(build)=$(@) 1188 1189# Things we need to do before we recursively start building the kernel 1190# or the modules are listed in "prepare". 1191# A multi level approach is used. prepareN is processed before prepareN-1. 1192# archprepare is used in arch Makefiles and when processed asm symlink, 1193# version.h and scripts_basic is processed / created. 1194 1195PHONY += prepare archprepare 1196 1197archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1198 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1199 include/generated/autoconf.h 1200 1201prepare0: archprepare 1202 $(Q)$(MAKE) $(build)=scripts/mod 1203 $(Q)$(MAKE) $(build)=. 1204 1205# All the preparing.. 1206prepare: prepare0 prepare-objtool prepare-resolve_btfids 1207 1208# Support for using generic headers in asm-generic 1209asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1210 1211PHONY += asm-generic uapi-asm-generic 1212asm-generic: uapi-asm-generic 1213 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1214 generic=include/asm-generic 1215uapi-asm-generic: 1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1217 generic=include/uapi/asm-generic 1218 1219PHONY += prepare-objtool prepare-resolve_btfids 1220prepare-objtool: $(objtool_target) 1221ifeq ($(SKIP_STACK_VALIDATION),1) 1222ifdef CONFIG_UNWINDER_ORC 1223 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1224 @false 1225else 1226 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1227endif 1228endif 1229 1230prepare-resolve_btfids: $(resolve_btfids_target) 1231ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1232 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1233 @false 1234endif 1235# Generate some files 1236# --------------------------------------------------------------------------- 1237 1238# KERNELRELEASE can change from a few different places, meaning version.h 1239# needs to be updated, so this check is forced on all builds 1240 1241uts_len := 64 1242define filechk_utsrelease.h 1243 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1244 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1245 exit 1; \ 1246 fi; \ 1247 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1248endef 1249 1250define filechk_version.h 1251 echo \#define LINUX_VERSION_CODE $(shell \ 1252 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1253 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1254endef 1255 1256$(version_h): FORCE 1257 $(call filechk,version.h) 1258 $(Q)rm -f $(old_version_h) 1259 1260include/generated/utsrelease.h: include/config/kernel.release FORCE 1261 $(call filechk,utsrelease.h) 1262 1263PHONY += headerdep 1264headerdep: 1265 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1266 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1267 1268# --------------------------------------------------------------------------- 1269# Kernel headers 1270 1271#Default location for installed headers 1272export INSTALL_HDR_PATH = $(objtree)/usr 1273 1274quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1275 cmd_headers_install = \ 1276 mkdir -p $(INSTALL_HDR_PATH); \ 1277 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1278 usr/include $(INSTALL_HDR_PATH) 1279 1280PHONY += headers_install 1281headers_install: headers 1282 $(call cmd,headers_install) 1283 1284PHONY += archheaders archscripts 1285 1286hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1287 1288PHONY += headers 1289headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1290 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1291 $(error Headers not exportable for the $(SRCARCH) architecture)) 1292 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1293 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1294 1295# Deprecated. It is no-op now. 1296PHONY += headers_check 1297headers_check: 1298 @: 1299 1300ifdef CONFIG_HEADERS_INSTALL 1301prepare: headers 1302endif 1303 1304PHONY += scripts_unifdef 1305scripts_unifdef: scripts_basic 1306 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1307 1308# --------------------------------------------------------------------------- 1309# Kernel selftest 1310 1311PHONY += kselftest 1312kselftest: 1313 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1314 1315kselftest-%: FORCE 1316 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1317 1318PHONY += kselftest-merge 1319kselftest-merge: 1320 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1321 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1322 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1323 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1324 1325# --------------------------------------------------------------------------- 1326# Devicetree files 1327 1328ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1329dtstree := arch/$(SRCARCH)/boot/dts 1330endif 1331 1332ifneq ($(dtstree),) 1333 1334%.dtb: include/config/kernel.release scripts_dtc 1335 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1336 1337PHONY += dtbs dtbs_install dtbs_check 1338dtbs: include/config/kernel.release scripts_dtc 1339 $(Q)$(MAKE) $(build)=$(dtstree) 1340 1341ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1342export CHECK_DTBS=y 1343dtbs: dt_binding_check 1344endif 1345 1346dtbs_check: dtbs 1347 1348dtbs_install: 1349 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1350 1351ifdef CONFIG_OF_EARLY_FLATTREE 1352all: dtbs 1353endif 1354 1355endif 1356 1357PHONY += scripts_dtc 1358scripts_dtc: scripts_basic 1359 $(Q)$(MAKE) $(build)=scripts/dtc 1360 1361ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1362export CHECK_DT_BINDING=y 1363endif 1364 1365PHONY += dt_binding_check 1366dt_binding_check: scripts_dtc 1367 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1368 1369# --------------------------------------------------------------------------- 1370# Modules 1371 1372ifdef CONFIG_MODULES 1373 1374# By default, build modules as well 1375 1376all: modules 1377 1378# When we're building modules with modversions, we need to consider 1379# the built-in objects during the descend as well, in order to 1380# make sure the checksums are up to date before we record them. 1381ifdef CONFIG_MODVERSIONS 1382 KBUILD_BUILTIN := 1 1383endif 1384 1385# Build modules 1386# 1387# A module can be listed more than once in obj-m resulting in 1388# duplicate lines in modules.order files. Those are removed 1389# using awk while concatenating to the final file. 1390 1391PHONY += modules 1392modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1393 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1394 1395PHONY += modules_check 1396modules_check: modules.order 1397 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1398 1399cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1400 1401modules.order: $(subdir-modorder) FORCE 1402 $(call if_changed,modules_order) 1403 1404targets += modules.order 1405 1406# Target to prepare building external modules 1407PHONY += modules_prepare 1408modules_prepare: prepare 1409 1410# Target to install modules 1411PHONY += modules_install 1412modules_install: _modinst_ _modinst_post 1413 1414PHONY += _modinst_ 1415_modinst_: 1416 @rm -rf $(MODLIB)/kernel 1417 @rm -f $(MODLIB)/source 1418 @mkdir -p $(MODLIB)/kernel 1419 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1420 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1421 rm -f $(MODLIB)/build ; \ 1422 ln -s $(CURDIR) $(MODLIB)/build ; \ 1423 fi 1424 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1425 @cp -f modules.builtin $(MODLIB)/ 1426 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1427 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1428 1429# This depmod is only for convenience to give the initial 1430# boot a modules.dep even before / is mounted read-write. However the 1431# boot script depmod is the master version. 1432PHONY += _modinst_post 1433_modinst_post: _modinst_ 1434 $(call cmd,depmod) 1435 1436ifeq ($(CONFIG_MODULE_SIG), y) 1437PHONY += modules_sign 1438modules_sign: 1439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1440endif 1441 1442else # CONFIG_MODULES 1443 1444# Modules not configured 1445# --------------------------------------------------------------------------- 1446 1447PHONY += modules modules_install 1448modules modules_install: 1449 @echo >&2 1450 @echo >&2 "The present kernel configuration has modules disabled." 1451 @echo >&2 "Type 'make config' and enable loadable module support." 1452 @echo >&2 "Then build a kernel with module support enabled." 1453 @echo >&2 1454 @exit 1 1455 1456endif # CONFIG_MODULES 1457 1458### 1459# Cleaning is done on three levels. 1460# make clean Delete most generated files 1461# Leave enough to build external modules 1462# make mrproper Delete the current configuration, and all generated files 1463# make distclean Remove editor backup files, patch leftover files and the like 1464 1465# Directories & files removed with 'make clean' 1466CLEAN_FILES += include/ksym vmlinux.symvers \ 1467 modules.builtin modules.builtin.modinfo modules.nsdeps 1468 1469# Directories & files removed with 'make mrproper' 1470MRPROPER_FILES += include/config include/generated \ 1471 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1472 debian snap tar-install \ 1473 .config .config.old .version \ 1474 Module.symvers \ 1475 signing_key.pem signing_key.priv signing_key.x509 \ 1476 x509.genkey extra_certificates signing_key.x509.keyid \ 1477 signing_key.x509.signer vmlinux-gdb.py \ 1478 *.spec 1479 1480# Directories & files removed with 'make distclean' 1481DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1482 1483# clean - Delete most, but leave enough to build external modules 1484# 1485clean: rm-files := $(CLEAN_FILES) 1486 1487PHONY += archclean vmlinuxclean 1488 1489vmlinuxclean: 1490 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1491 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1492 1493clean: archclean vmlinuxclean 1494 1495# mrproper - Delete all generated files, including .config 1496# 1497mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1498mrproper-dirs := $(addprefix _mrproper_,scripts) 1499 1500PHONY += $(mrproper-dirs) mrproper 1501$(mrproper-dirs): 1502 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1503 1504mrproper: clean $(mrproper-dirs) 1505 $(call cmd,rmfiles) 1506 1507# distclean 1508# 1509distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1510 1511PHONY += distclean 1512 1513distclean: mrproper 1514 $(call cmd,rmfiles) 1515 @find $(srctree) $(RCS_FIND_IGNORE) \ 1516 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1517 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1518 -o -name 'core' \) \ 1519 -type f -print | xargs rm -f 1520 1521 1522# Packaging of the kernel to various formats 1523# --------------------------------------------------------------------------- 1524 1525%src-pkg: FORCE 1526 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1527%pkg: include/config/kernel.release FORCE 1528 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1529 1530# Brief documentation of the typical targets used 1531# --------------------------------------------------------------------------- 1532 1533boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1534boards := $(sort $(notdir $(boards))) 1535board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1536board-dirs := $(sort $(notdir $(board-dirs:/=))) 1537 1538PHONY += help 1539help: 1540 @echo 'Cleaning targets:' 1541 @echo ' clean - Remove most generated files but keep the config and' 1542 @echo ' enough build support to build external modules' 1543 @echo ' mrproper - Remove all generated files + config + various backup files' 1544 @echo ' distclean - mrproper + remove editor backup and patch files' 1545 @echo '' 1546 @echo 'Configuration targets:' 1547 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1548 @echo '' 1549 @echo 'Other generic targets:' 1550 @echo ' all - Build all targets marked with [*]' 1551 @echo '* vmlinux - Build the bare kernel' 1552 @echo '* modules - Build all modules' 1553 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1554 @echo ' dir/ - Build all files in dir and below' 1555 @echo ' dir/file.[ois] - Build specified target only' 1556 @echo ' dir/file.ll - Build the LLVM assembly file' 1557 @echo ' (requires compiler support for LLVM assembly generation)' 1558 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1559 @echo ' (requires a recent binutils and recent build (System.map))' 1560 @echo ' dir/file.ko - Build module including final link' 1561 @echo ' modules_prepare - Set up for building external modules' 1562 @echo ' tags/TAGS - Generate tags file for editors' 1563 @echo ' cscope - Generate cscope index' 1564 @echo ' gtags - Generate GNU GLOBAL index' 1565 @echo ' kernelrelease - Output the release version string (use with make -s)' 1566 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1567 @echo ' image_name - Output the image name (use with make -s)' 1568 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1569 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1570 echo '' 1571 @echo 'Static analysers:' 1572 @echo ' checkstack - Generate a list of stack hogs' 1573 @echo ' namespacecheck - Name space analysis on compiled kernel' 1574 @echo ' versioncheck - Sanity check on version.h usage' 1575 @echo ' includecheck - Check for duplicate included header files' 1576 @echo ' export_report - List the usages of all exported symbols' 1577 @echo ' headerdep - Detect inclusion cycles in headers' 1578 @echo ' coccicheck - Check with Coccinelle' 1579 @echo '' 1580 @echo 'Tools:' 1581 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1582 @echo '' 1583 @echo 'Kernel selftest:' 1584 @echo ' kselftest - Build and run kernel selftest' 1585 @echo ' Build, install, and boot kernel before' 1586 @echo ' running kselftest on it' 1587 @echo ' Run as root for full coverage' 1588 @echo ' kselftest-all - Build kernel selftest' 1589 @echo ' kselftest-install - Build and install kernel selftest' 1590 @echo ' kselftest-clean - Remove all generated kselftest files' 1591 @echo ' kselftest-merge - Merge all the config dependencies of' 1592 @echo ' kselftest to existing .config.' 1593 @echo '' 1594 @$(if $(dtstree), \ 1595 echo 'Devicetree:'; \ 1596 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1597 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1598 echo ' dt_binding_check - Validate device tree binding documents'; \ 1599 echo ' dtbs_check - Validate device tree source files';\ 1600 echo '') 1601 1602 @echo 'Userspace tools targets:' 1603 @echo ' use "make tools/help"' 1604 @echo ' or "cd tools; make help"' 1605 @echo '' 1606 @echo 'Kernel packaging:' 1607 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1608 @echo '' 1609 @echo 'Documentation targets:' 1610 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1611 @echo '' 1612 @echo 'Architecture specific targets ($(SRCARCH)):' 1613 @$(if $(archhelp),$(archhelp),\ 1614 echo ' No architecture specific help defined for $(SRCARCH)') 1615 @echo '' 1616 @$(if $(boards), \ 1617 $(foreach b, $(boards), \ 1618 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1619 echo '') 1620 @$(if $(board-dirs), \ 1621 $(foreach b, $(board-dirs), \ 1622 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1623 printf " %-16s - Show all of the above\\n" help-boards; \ 1624 echo '') 1625 1626 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1627 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1628 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1629 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1630 @echo ' (sparse by default)' 1631 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1632 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1633 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1634 @echo ' 1: warnings which may be relevant and do not occur too often' 1635 @echo ' 2: warnings which occur quite often but may still be relevant' 1636 @echo ' 3: more obscure warnings, can most likely be ignored' 1637 @echo ' Multiple levels can be combined with W=12 or W=123' 1638 @echo '' 1639 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1640 @echo 'For further info see the ./README file' 1641 1642 1643help-board-dirs := $(addprefix help-,$(board-dirs)) 1644 1645help-boards: $(help-board-dirs) 1646 1647boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1648 1649$(help-board-dirs): help-%: 1650 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1651 @$(if $(boards-per-dir), \ 1652 $(foreach b, $(boards-per-dir), \ 1653 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1654 echo '') 1655 1656 1657# Documentation targets 1658# --------------------------------------------------------------------------- 1659DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1660 linkcheckdocs dochelp refcheckdocs 1661PHONY += $(DOC_TARGETS) 1662$(DOC_TARGETS): 1663 $(Q)$(MAKE) $(build)=Documentation $@ 1664 1665# Misc 1666# --------------------------------------------------------------------------- 1667 1668PHONY += scripts_gdb 1669scripts_gdb: prepare0 1670 $(Q)$(MAKE) $(build)=scripts/gdb 1671 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1672 1673ifdef CONFIG_GDB_SCRIPTS 1674all: scripts_gdb 1675endif 1676 1677else # KBUILD_EXTMOD 1678 1679### 1680# External module support. 1681# When building external modules the kernel used as basis is considered 1682# read-only, and no consistency checks are made and the make 1683# system is not used on the basis kernel. If updates are required 1684# in the basis kernel ordinary make commands (without M=...) must 1685# be used. 1686# 1687# The following are the only valid targets when building external 1688# modules. 1689# make M=dir clean Delete all automatically generated files 1690# make M=dir modules Make all modules in specified dir 1691# make M=dir Same as 'make M=dir modules' 1692# make M=dir modules_install 1693# Install the modules built in the module directory 1694# Assumes install directory is already created 1695 1696# We are always building modules 1697KBUILD_MODULES := 1 1698 1699build-dirs := $(KBUILD_EXTMOD) 1700PHONY += modules 1701modules: descend 1702 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1703 1704PHONY += modules_install 1705modules_install: _emodinst_ _emodinst_post 1706 1707install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1708PHONY += _emodinst_ 1709_emodinst_: 1710 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1711 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1712 1713PHONY += _emodinst_post 1714_emodinst_post: _emodinst_ 1715 $(call cmd,depmod) 1716 1717clean-dirs := $(KBUILD_EXTMOD) 1718clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1719 1720PHONY += help 1721help: 1722 @echo ' Building external modules.' 1723 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1724 @echo '' 1725 @echo ' modules - default target, build the module(s)' 1726 @echo ' modules_install - install the module' 1727 @echo ' clean - remove generated files in module directory only' 1728 @echo '' 1729 1730PHONY += prepare 1731endif # KBUILD_EXTMOD 1732 1733# Single targets 1734# --------------------------------------------------------------------------- 1735# To build individual files in subdirectories, you can do like this: 1736# 1737# make foo/bar/baz.s 1738# 1739# The supported suffixes for single-target are listed in 'single-targets' 1740# 1741# To build only under specific subdirectories, you can do like this: 1742# 1743# make foo/bar/baz/ 1744 1745ifdef single-build 1746 1747# .ko is special because modpost is needed 1748single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1749single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1750 1751$(single-ko): single_modpost 1752 @: 1753$(single-no-ko): descend 1754 @: 1755 1756ifeq ($(KBUILD_EXTMOD),) 1757# For the single build of in-tree modules, use a temporary file to avoid 1758# the situation of modules_install installing an invalid modules.order. 1759MODORDER := .modules.tmp 1760endif 1761 1762PHONY += single_modpost 1763single_modpost: $(single-no-ko) 1764 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1766 1767KBUILD_MODULES := 1 1768 1769export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1770 1771# trim unrelated directories 1772build-dirs := $(foreach d, $(build-dirs), \ 1773 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1774 1775endif 1776 1777ifndef CONFIG_MODULES 1778KBUILD_MODULES := 1779endif 1780 1781# Handle descending into subdirectories listed in $(build-dirs) 1782# Preset locale variables to speed up the build process. Limit locale 1783# tweaks to this spot to avoid wrong language settings when running 1784# make menuconfig etc. 1785# Error messages still appears in the original language 1786PHONY += descend $(build-dirs) 1787descend: $(build-dirs) 1788$(build-dirs): prepare 1789 $(Q)$(MAKE) $(build)=$@ \ 1790 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1791 need-builtin=1 need-modorder=1 1792 1793clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1794PHONY += $(clean-dirs) clean 1795$(clean-dirs): 1796 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1797 1798clean: $(clean-dirs) 1799 $(call cmd,rmfiles) 1800 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1801 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1802 -o -name '*.ko.*' \ 1803 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1804 -o -name '*.dwo' -o -name '*.lst' \ 1805 -o -name '*.su' -o -name '*.mod' \ 1806 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1807 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1808 -o -name '*.asn1.[ch]' \ 1809 -o -name '*.symtypes' -o -name 'modules.order' \ 1810 -o -name '.tmp_*.o.*' \ 1811 -o -name '*.c.[012]*.*' \ 1812 -o -name '*.ll' \ 1813 -o -name '*.gcno' \) -type f -print | xargs rm -f 1814 1815# Generate tags for editors 1816# --------------------------------------------------------------------------- 1817quiet_cmd_tags = GEN $@ 1818 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1819 1820tags TAGS cscope gtags: FORCE 1821 $(call cmd,tags) 1822 1823# Script to generate missing namespace dependencies 1824# --------------------------------------------------------------------------- 1825 1826PHONY += nsdeps 1827nsdeps: export KBUILD_NSDEPS=1 1828nsdeps: modules 1829 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1830 1831# Scripts to check various things for consistency 1832# --------------------------------------------------------------------------- 1833 1834PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1835 1836includecheck: 1837 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1838 -name '*.[hcS]' -type f -print | sort \ 1839 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1840 1841versioncheck: 1842 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1843 -name '*.[hcS]' -type f -print | sort \ 1844 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1845 1846coccicheck: 1847 $(Q)$(BASH) $(srctree)/scripts/$@ 1848 1849namespacecheck: 1850 $(PERL) $(srctree)/scripts/namespace.pl 1851 1852export_report: 1853 $(PERL) $(srctree)/scripts/export_report.pl 1854 1855PHONY += checkstack kernelrelease kernelversion image_name 1856 1857# UML needs a little special treatment here. It wants to use the host 1858# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1859# else wants $(ARCH), including people doing cross-builds, which means 1860# that $(SUBARCH) doesn't work here. 1861ifeq ($(ARCH), um) 1862CHECKSTACK_ARCH := $(SUBARCH) 1863else 1864CHECKSTACK_ARCH := $(ARCH) 1865endif 1866checkstack: 1867 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1868 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1869 1870kernelrelease: 1871 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1872 1873kernelversion: 1874 @echo $(KERNELVERSION) 1875 1876image_name: 1877 @echo $(KBUILD_IMAGE) 1878 1879# Clear a bunch of variables before executing the submake 1880 1881ifeq ($(quiet),silent_) 1882tools_silent=s 1883endif 1884 1885tools/: FORCE 1886 $(Q)mkdir -p $(objtree)/tools 1887 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1888 1889tools/%: FORCE 1890 $(Q)mkdir -p $(objtree)/tools 1891 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1892 1893quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1894 cmd_rmfiles = rm -rf $(rm-files) 1895 1896# Run depmod only if we have System.map and depmod is executable 1897quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1898 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1899 $(KERNELRELEASE) 1900 1901# read saved command lines for existing targets 1902existing-targets := $(wildcard $(sort $(targets))) 1903 1904-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1905 1906endif # config-build 1907endif # mixed-build 1908endif # need-sub-make 1909 1910PHONY += FORCE 1911FORCE: 1912 1913# Declare the contents of the PHONY variable as phony. We keep that 1914# information in a variable so we can use it in if_changed and friends. 1915.PHONY: $(PHONY) 1916