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 := 508export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 509KBUILD_LDFLAGS := 510CLANG_FLAGS := 511 512export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 513export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 514export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 515export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 516export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 517 518export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 519export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 520export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN 521export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 522export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 523export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 524 525# Files to ignore in find ... statements 526 527export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 528 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 529 -prune -o 530export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 531 --exclude CVS --exclude .pc --exclude .hg --exclude .git 532 533# =========================================================================== 534# Rules shared between *config targets and build targets 535 536# Basic helpers built in scripts/basic/ 537PHONY += scripts_basic 538scripts_basic: 539 $(Q)$(MAKE) $(build)=scripts/basic 540 $(Q)rm -f .tmp_quiet_recordmcount 541 542PHONY += outputmakefile 543# Before starting out-of-tree build, make sure the source tree is clean. 544# outputmakefile generates a Makefile in the output directory, if using a 545# separate output directory. This allows convenient use of make in the 546# output directory. 547# At the same time when output Makefile generated, generate .gitignore to 548# ignore whole output directory 549outputmakefile: 550ifdef building_out_of_srctree 551 $(Q)if [ -f $(srctree)/.config -o \ 552 -d $(srctree)/include/config -o \ 553 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 554 echo >&2 "***"; \ 555 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 556 echo >&2 "*** in $(abs_srctree)";\ 557 echo >&2 "***"; \ 558 false; \ 559 fi 560 $(Q)ln -fsn $(srctree) source 561 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 562 $(Q)test -e .gitignore || \ 563 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 564endif 565 566ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 567ifneq ($(CROSS_COMPILE),) 568CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 569GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 570CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 571GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 572endif 573ifneq ($(GCC_TOOLCHAIN),) 574CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 575endif 576ifneq ($(LLVM_IAS),1) 577CLANG_FLAGS += -no-integrated-as 578endif 579CLANG_FLAGS += -Werror=unknown-warning-option 580KBUILD_CFLAGS += $(CLANG_FLAGS) 581KBUILD_AFLAGS += $(CLANG_FLAGS) 582export CLANG_FLAGS 583endif 584 585# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 586# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 587# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 588# and from include/config/auto.conf.cmd to detect the compiler upgrade. 589CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 590 591ifdef config-build 592# =========================================================================== 593# *config targets only - make sure prerequisites are updated, and descend 594# in scripts/kconfig to make the *config target 595 596# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 597# KBUILD_DEFCONFIG may point out an alternative default configuration 598# used for 'make defconfig' 599include arch/$(SRCARCH)/Makefile 600export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 601 602config: outputmakefile scripts_basic FORCE 603 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 604 605%config: outputmakefile scripts_basic FORCE 606 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 607 608else #!config-build 609# =========================================================================== 610# Build targets only - this includes vmlinux, arch specific targets, clean 611# targets and others. In general all targets except *config targets. 612 613# If building an external module we do not care about the all: rule 614# but instead __all depend on modules 615PHONY += all 616ifeq ($(KBUILD_EXTMOD),) 617__all: all 618else 619__all: modules 620endif 621 622# Decide whether to build built-in, modular, or both. 623# Normally, just do built-in. 624 625KBUILD_MODULES := 626KBUILD_BUILTIN := 1 627 628# If we have only "make modules", don't compile built-in objects. 629ifeq ($(MAKECMDGOALS),modules) 630 KBUILD_BUILTIN := 631endif 632 633# If we have "make <whatever> modules", compile modules 634# in addition to whatever we do anyway. 635# Just "make" or "make all" shall build modules as well 636 637ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 638 KBUILD_MODULES := 1 639endif 640 641ifeq ($(MAKECMDGOALS),) 642 KBUILD_MODULES := 1 643endif 644 645export KBUILD_MODULES KBUILD_BUILTIN 646 647ifdef need-config 648include include/config/auto.conf 649endif 650 651ifeq ($(KBUILD_EXTMOD),) 652# Objects we will link into vmlinux / subdirs we need to visit 653core-y := init/ usr/ 654drivers-y := drivers/ sound/ 655drivers-$(CONFIG_SAMPLES) += samples/ 656drivers-y += net/ virt/ 657libs-y := lib/ 658endif # KBUILD_EXTMOD 659 660# The all: target is the default when no target is given on the 661# command line. 662# This allow a user to issue only 'make' to build a kernel including modules 663# Defaults to vmlinux, but the arch makefile usually adds further targets 664all: vmlinux 665 666CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 667 $(call cc-option,-fno-tree-loop-im) \ 668 $(call cc-disable-warning,maybe-uninitialized,) 669export CFLAGS_GCOV 670 671# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 672ifdef CONFIG_FUNCTION_TRACER 673 CC_FLAGS_FTRACE := -pg 674endif 675 676RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 677RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 678RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 679RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 680RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 681RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 682export RETPOLINE_CFLAGS 683export RETPOLINE_VDSO_CFLAGS 684 685include arch/$(SRCARCH)/Makefile 686 687ifdef need-config 688ifdef may-sync-config 689# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 690# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 691# because some architectures define CROSS_COMPILE there. 692include include/config/auto.conf.cmd 693 694$(KCONFIG_CONFIG): 695 @echo >&2 '***' 696 @echo >&2 '*** Configuration file "$@" not found!' 697 @echo >&2 '***' 698 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 699 @echo >&2 '*** "make menuconfig" or "make xconfig").' 700 @echo >&2 '***' 701 @/bin/false 702 703# The actual configuration files used during the build are stored in 704# include/generated/ and include/config/. Update them if .config is newer than 705# include/config/auto.conf (which mirrors .config). 706# 707# This exploits the 'multi-target pattern rule' trick. 708# The syncconfig should be executed only once to make all the targets. 709# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 710%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 711 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 712else # !may-sync-config 713# External modules and some install targets need include/generated/autoconf.h 714# and include/config/auto.conf but do not care if they are up-to-date. 715# Use auto.conf to trigger the test 716PHONY += include/config/auto.conf 717 718include/config/auto.conf: 719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 720 echo >&2; \ 721 echo >&2 " ERROR: Kernel configuration is invalid."; \ 722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 724 echo >&2 ; \ 725 /bin/false) 726 727endif # may-sync-config 728endif # need-config 729 730KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 731KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 732KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 733KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 734KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 735 736ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 737KBUILD_CFLAGS += -O2 738else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 739KBUILD_CFLAGS += -O3 740else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 741KBUILD_CFLAGS += -Os 742endif 743 744# Tell gcc to never replace conditional load with a non-conditional one 745KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 746KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 747 748ifdef CONFIG_READABLE_ASM 749# Disable optimizations that make assembler listings hard to read. 750# reorder blocks reorders the control in the function 751# ipa clone creates specialized cloned functions 752# partial inlining inlines only parts of functions 753KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 754 $(call cc-option,-fno-ipa-cp-clone,) \ 755 $(call cc-option,-fno-partial-inlining) 756endif 757 758ifneq ($(CONFIG_FRAME_WARN),0) 759KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 760endif 761 762stackp-flags-y := -fno-stack-protector 763stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 764stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 765 766KBUILD_CFLAGS += $(stackp-flags-y) 767 768ifdef CONFIG_CC_IS_CLANG 769KBUILD_CPPFLAGS += -Qunused-arguments 770KBUILD_CFLAGS += -Wno-format-invalid-specifier 771KBUILD_CFLAGS += -Wno-gnu 772# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 773# source of a reference will be _MergedGlobals and not on of the whitelisted names. 774# See modpost pattern 2 775KBUILD_CFLAGS += -mno-global-merge 776else 777 778# These warnings generated too much noise in a regular build. 779# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 780KBUILD_CFLAGS += -Wno-unused-but-set-variable 781 782# Warn about unmarked fall-throughs in switch statement. 783# Disabled for clang while comment to attribute conversion happens and 784# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 785KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 786endif 787 788KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 789ifdef CONFIG_FRAME_POINTER 790KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 791else 792# Some targets (ARM with Thumb2, for example), can't be built with frame 793# pointers. For those, we don't have FUNCTION_TRACER automatically 794# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 795# incompatible with -fomit-frame-pointer with current GCC, so we don't use 796# -fomit-frame-pointer with FUNCTION_TRACER. 797ifndef CONFIG_FUNCTION_TRACER 798KBUILD_CFLAGS += -fomit-frame-pointer 799endif 800endif 801 802# Initialize all stack variables with a 0xAA pattern. 803ifdef CONFIG_INIT_STACK_ALL_PATTERN 804KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 805endif 806 807# Initialize all stack variables with a zero value. 808ifdef CONFIG_INIT_STACK_ALL_ZERO 809# Future support for zero initialization is still being debated, see 810# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 811# renamed or dropped. 812KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 813KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 814endif 815 816DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 817 818ifdef CONFIG_DEBUG_INFO 819ifdef CONFIG_DEBUG_INFO_SPLIT 820DEBUG_CFLAGS += -gsplit-dwarf 821else 822DEBUG_CFLAGS += -g 823endif 824KBUILD_AFLAGS += -Wa,-gdwarf-2 825endif 826ifdef CONFIG_DEBUG_INFO_DWARF4 827DEBUG_CFLAGS += -gdwarf-4 828endif 829 830ifdef CONFIG_DEBUG_INFO_REDUCED 831DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 832 $(call cc-option,-fno-var-tracking) 833endif 834 835ifdef CONFIG_DEBUG_INFO_COMPRESSED 836DEBUG_CFLAGS += -gz=zlib 837KBUILD_AFLAGS += -gz=zlib 838KBUILD_LDFLAGS += --compress-debug-sections=zlib 839endif 840 841KBUILD_CFLAGS += $(DEBUG_CFLAGS) 842export DEBUG_CFLAGS 843 844ifdef CONFIG_FUNCTION_TRACER 845ifdef CONFIG_FTRACE_MCOUNT_RECORD 846 # gcc 5 supports generating the mcount tables directly 847 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 848 CC_FLAGS_FTRACE += -mrecord-mcount 849 export CC_USING_RECORD_MCOUNT := 1 850 endif 851 ifdef CONFIG_HAVE_NOP_MCOUNT 852 ifeq ($(call cc-option-yn, -mnop-mcount),y) 853 CC_FLAGS_FTRACE += -mnop-mcount 854 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 855 endif 856 endif 857endif 858ifdef CONFIG_HAVE_FENTRY 859 ifeq ($(call cc-option-yn, -mfentry),y) 860 CC_FLAGS_FTRACE += -mfentry 861 CC_FLAGS_USING += -DCC_USING_FENTRY 862 endif 863endif 864export CC_FLAGS_FTRACE 865KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 866KBUILD_AFLAGS += $(CC_FLAGS_USING) 867ifdef CONFIG_DYNAMIC_FTRACE 868 ifdef CONFIG_HAVE_C_RECORDMCOUNT 869 BUILD_C_RECORDMCOUNT := y 870 export BUILD_C_RECORDMCOUNT 871 endif 872endif 873endif 874 875# We trigger additional mismatches with less inlining 876ifdef CONFIG_DEBUG_SECTION_MISMATCH 877KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 878endif 879 880ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 881KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 882LDFLAGS_vmlinux += --gc-sections 883endif 884 885ifdef CONFIG_LIVEPATCH 886KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 887endif 888 889ifdef CONFIG_SHADOW_CALL_STACK 890CC_FLAGS_SCS := -fsanitize=shadow-call-stack 891KBUILD_CFLAGS += $(CC_FLAGS_SCS) 892export CC_FLAGS_SCS 893endif 894 895ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 896KBUILD_CFLAGS += -falign-functions=32 897endif 898 899# arch Makefile may override CC so keep this after arch Makefile is included 900NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 901 902# warn about C99 declaration after statement 903KBUILD_CFLAGS += -Wdeclaration-after-statement 904 905# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 906KBUILD_CFLAGS += -Wvla 907 908# disable pointer signed / unsigned warnings in gcc 4.0 909KBUILD_CFLAGS += -Wno-pointer-sign 910 911# disable stringop warnings in gcc 8+ 912KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 913 914# We'll want to enable this eventually, but it's not going away for 5.7 at least 915KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 916KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 917KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 918 919# Another good warning that we'll want to enable eventually 920KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 921 922# Enabled with W=2, disabled by default as noisy 923KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 924 925# disable invalid "can't wrap" optimizations for signed / pointers 926KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 927 928# clang sets -fmerge-all-constants by default as optimization, but this 929# is non-conforming behavior for C and in fact breaks the kernel, so we 930# need to disable it here generally. 931KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 932 933# for gcc -fno-merge-all-constants disables everything, but it is fine 934# to have actual conforming behavior enabled. 935KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 936 937# Make sure -fstack-check isn't enabled (like gentoo apparently did) 938KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 939 940# conserve stack if available 941KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 942 943# Prohibit date/time macros, which would make the build non-deterministic 944KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 945 946# enforce correct pointer usage 947KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 948 949# Require designated initializers for all marked structures 950KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 951 952# change __FILE__ to the relative path from the srctree 953KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 954 955# ensure -fcf-protection is disabled when using retpoline as it is 956# incompatible with -mindirect-branch=thunk-extern 957ifdef CONFIG_RETPOLINE 958KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 959endif 960 961# include additional Makefiles when needed 962include-y := scripts/Makefile.extrawarn 963include-$(CONFIG_KASAN) += scripts/Makefile.kasan 964include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 965include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 966include-$(CONFIG_KCOV) += scripts/Makefile.kcov 967include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 968 969include $(addprefix $(srctree)/, $(include-y)) 970 971# scripts/Makefile.gcc-plugins is intentionally included last. 972# Do not add $(call cc-option,...) below this line. When you build the kernel 973# from the clean source tree, the GCC plugins do not exist at this point. 974 975# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 976KBUILD_CPPFLAGS += $(KCPPFLAGS) 977KBUILD_AFLAGS += $(KAFLAGS) 978KBUILD_CFLAGS += $(KCFLAGS) 979 980KBUILD_LDFLAGS_MODULE += --build-id 981LDFLAGS_vmlinux += --build-id 982 983ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 984LDFLAGS_vmlinux += $(call ld-option, -X,) 985endif 986 987ifeq ($(CONFIG_RELR),y) 988LDFLAGS_vmlinux += --pack-dyn-relocs=relr 989endif 990 991# Align the bit size of userspace programs with the kernel 992KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 993KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 994 995# make the checker run with the right architecture 996CHECKFLAGS += --arch=$(ARCH) 997 998# insure the checker run with the right endianness 999CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1000 1001# the checker needs the correct machine size 1002CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1003 1004# Default kernel image to build when no specific target is given. 1005# KBUILD_IMAGE may be overruled on the command line or 1006# set in the environment 1007# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1008# this default value 1009export KBUILD_IMAGE ?= vmlinux 1010 1011# 1012# INSTALL_PATH specifies where to place the updated kernel and system map 1013# images. Default is /boot, but you can set it to other values 1014export INSTALL_PATH ?= /boot 1015 1016# 1017# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1018# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1019# an argument if needed. Otherwise it defaults to the kernel install path 1020# 1021export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1022 1023# 1024# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1025# relocations required by build roots. This is not defined in the 1026# makefile but the argument can be passed to make if needed. 1027# 1028 1029MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1030export MODLIB 1031 1032# 1033# INSTALL_MOD_STRIP, if defined, will cause modules to be 1034# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1035# the default option --strip-debug will be used. Otherwise, 1036# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1037 1038ifdef INSTALL_MOD_STRIP 1039ifeq ($(INSTALL_MOD_STRIP),1) 1040mod_strip_cmd = $(STRIP) --strip-debug 1041else 1042mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1043endif # INSTALL_MOD_STRIP=1 1044else 1045mod_strip_cmd = true 1046endif # INSTALL_MOD_STRIP 1047export mod_strip_cmd 1048 1049# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1050# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1051# or CONFIG_MODULE_COMPRESS_XZ. 1052 1053mod_compress_cmd = true 1054ifdef CONFIG_MODULE_COMPRESS 1055 ifdef CONFIG_MODULE_COMPRESS_GZIP 1056 mod_compress_cmd = $(KGZIP) -n -f 1057 endif # CONFIG_MODULE_COMPRESS_GZIP 1058 ifdef CONFIG_MODULE_COMPRESS_XZ 1059 mod_compress_cmd = $(XZ) -f 1060 endif # CONFIG_MODULE_COMPRESS_XZ 1061endif # CONFIG_MODULE_COMPRESS 1062export mod_compress_cmd 1063 1064ifdef CONFIG_MODULE_SIG_ALL 1065$(eval $(call config_filename,MODULE_SIG_KEY)) 1066 1067mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1068else 1069mod_sign_cmd = true 1070endif 1071export mod_sign_cmd 1072 1073HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1074 1075has_libelf = $(call try-run,\ 1076 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1077 1078ifdef CONFIG_STACK_VALIDATION 1079 ifeq ($(has_libelf),1) 1080 objtool_target := tools/objtool FORCE 1081 else 1082 SKIP_STACK_VALIDATION := 1 1083 export SKIP_STACK_VALIDATION 1084 endif 1085endif 1086 1087ifdef CONFIG_DEBUG_INFO_BTF 1088 ifeq ($(has_libelf),1) 1089 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1090 else 1091 ERROR_RESOLVE_BTFIDS := 1 1092 endif 1093endif 1094 1095PHONY += prepare0 1096 1097export MODORDER := $(extmod-prefix)modules.order 1098export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1099 1100ifeq ($(KBUILD_EXTMOD),) 1101core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1102 1103vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1104 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1105 $(libs-y) $(libs-m))) 1106 1107vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1108 $(patsubst %/,%,$(filter %/, $(core-) \ 1109 $(drivers-) $(libs-)))) 1110 1111subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1112 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1113 $(drivers-y) $(drivers-m))) 1114 1115build-dirs := $(vmlinux-dirs) 1116clean-dirs := $(vmlinux-alldirs) 1117 1118# Externally visible symbols (used by link-vmlinux.sh) 1119KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1120KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1121ifdef CONFIG_MODULES 1122KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1123KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1124else 1125KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1126endif 1127KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1128 1129export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1130export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1131# used by scripts/Makefile.package 1132export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1133 1134vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1135 1136# Recurse until adjust_autoksyms.sh is satisfied 1137PHONY += autoksyms_recursive 1138ifdef CONFIG_TRIM_UNUSED_KSYMS 1139# For the kernel to actually contain only the needed exported symbols, 1140# we have to build modules as well to determine what those symbols are. 1141# (this can be evaluated only once include/config/auto.conf has been included) 1142KBUILD_MODULES := 1 1143 1144autoksyms_recursive: descend modules.order 1145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1146 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1147endif 1148 1149autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1150 1151quiet_cmd_autoksyms_h = GEN $@ 1152 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1153 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1154 1155$(autoksyms_h): 1156 $(call cmd,autoksyms_h) 1157 1158ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1159 1160# Final link of vmlinux with optional arch pass after final link 1161cmd_link-vmlinux = \ 1162 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1163 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1164 1165vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1166 +$(call if_changed,link-vmlinux) 1167 1168targets := vmlinux 1169 1170# The actual objects are generated when descending, 1171# make sure no implicit rule kicks in 1172$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1173 1174filechk_kernel.release = \ 1175 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1176 1177# Store (new) KERNELRELEASE string in include/config/kernel.release 1178include/config/kernel.release: FORCE 1179 $(call filechk,kernel.release) 1180 1181# Additional helpers built in scripts/ 1182# Carefully list dependencies so we do not try to build scripts twice 1183# in parallel 1184PHONY += scripts 1185scripts: scripts_basic scripts_dtc 1186 $(Q)$(MAKE) $(build)=$(@) 1187 1188# Things we need to do before we recursively start building the kernel 1189# or the modules are listed in "prepare". 1190# A multi level approach is used. prepareN is processed before prepareN-1. 1191# archprepare is used in arch Makefiles and when processed asm symlink, 1192# version.h and scripts_basic is processed / created. 1193 1194PHONY += prepare archprepare 1195 1196archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1197 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1198 include/generated/autoconf.h 1199 1200prepare0: archprepare 1201 $(Q)$(MAKE) $(build)=scripts/mod 1202 $(Q)$(MAKE) $(build)=. 1203 1204# All the preparing.. 1205prepare: prepare0 prepare-objtool prepare-resolve_btfids 1206 1207# Support for using generic headers in asm-generic 1208asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1209 1210PHONY += asm-generic uapi-asm-generic 1211asm-generic: uapi-asm-generic 1212 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1213 generic=include/asm-generic 1214uapi-asm-generic: 1215 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1216 generic=include/uapi/asm-generic 1217 1218PHONY += prepare-objtool prepare-resolve_btfids 1219prepare-objtool: $(objtool_target) 1220ifeq ($(SKIP_STACK_VALIDATION),1) 1221ifdef CONFIG_UNWINDER_ORC 1222 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1223 @false 1224else 1225 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1226endif 1227endif 1228 1229prepare-resolve_btfids: $(resolve_btfids_target) 1230ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1231 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1232 @false 1233endif 1234# Generate some files 1235# --------------------------------------------------------------------------- 1236 1237# KERNELRELEASE can change from a few different places, meaning version.h 1238# needs to be updated, so this check is forced on all builds 1239 1240uts_len := 64 1241define filechk_utsrelease.h 1242 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1243 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1244 exit 1; \ 1245 fi; \ 1246 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1247endef 1248 1249define filechk_version.h 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1252 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1253endef 1254 1255$(version_h): FORCE 1256 $(call filechk,version.h) 1257 $(Q)rm -f $(old_version_h) 1258 1259include/generated/utsrelease.h: include/config/kernel.release FORCE 1260 $(call filechk,utsrelease.h) 1261 1262PHONY += headerdep 1263headerdep: 1264 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1265 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1266 1267# --------------------------------------------------------------------------- 1268# Kernel headers 1269 1270#Default location for installed headers 1271export INSTALL_HDR_PATH = $(objtree)/usr 1272 1273quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1274 cmd_headers_install = \ 1275 mkdir -p $(INSTALL_HDR_PATH); \ 1276 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1277 usr/include $(INSTALL_HDR_PATH) 1278 1279PHONY += headers_install 1280headers_install: headers 1281 $(call cmd,headers_install) 1282 1283PHONY += archheaders archscripts 1284 1285hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1286 1287PHONY += headers 1288headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1289 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1290 $(error Headers not exportable for the $(SRCARCH) architecture)) 1291 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1292 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1293 1294# Deprecated. It is no-op now. 1295PHONY += headers_check 1296headers_check: 1297 @: 1298 1299ifdef CONFIG_HEADERS_INSTALL 1300prepare: headers 1301endif 1302 1303PHONY += scripts_unifdef 1304scripts_unifdef: scripts_basic 1305 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1306 1307# --------------------------------------------------------------------------- 1308# Kernel selftest 1309 1310PHONY += kselftest 1311kselftest: 1312 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1313 1314kselftest-%: FORCE 1315 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1316 1317PHONY += kselftest-merge 1318kselftest-merge: 1319 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1320 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1321 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1322 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1323 1324# --------------------------------------------------------------------------- 1325# Devicetree files 1326 1327ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1328dtstree := arch/$(SRCARCH)/boot/dts 1329endif 1330 1331ifneq ($(dtstree),) 1332 1333%.dtb: include/config/kernel.release scripts_dtc 1334 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1335 1336PHONY += dtbs dtbs_install dtbs_check 1337dtbs: include/config/kernel.release scripts_dtc 1338 $(Q)$(MAKE) $(build)=$(dtstree) 1339 1340ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1341export CHECK_DTBS=y 1342dtbs: dt_binding_check 1343endif 1344 1345dtbs_check: dtbs 1346 1347dtbs_install: 1348 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1349 1350ifdef CONFIG_OF_EARLY_FLATTREE 1351all: dtbs 1352endif 1353 1354endif 1355 1356PHONY += scripts_dtc 1357scripts_dtc: scripts_basic 1358 $(Q)$(MAKE) $(build)=scripts/dtc 1359 1360ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1361export CHECK_DT_BINDING=y 1362endif 1363 1364PHONY += dt_binding_check 1365dt_binding_check: scripts_dtc 1366 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1367 1368# --------------------------------------------------------------------------- 1369# Modules 1370 1371ifdef CONFIG_MODULES 1372 1373# By default, build modules as well 1374 1375all: modules 1376 1377# When we're building modules with modversions, we need to consider 1378# the built-in objects during the descend as well, in order to 1379# make sure the checksums are up to date before we record them. 1380ifdef CONFIG_MODVERSIONS 1381 KBUILD_BUILTIN := 1 1382endif 1383 1384# Build modules 1385# 1386# A module can be listed more than once in obj-m resulting in 1387# duplicate lines in modules.order files. Those are removed 1388# using awk while concatenating to the final file. 1389 1390PHONY += modules 1391modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1392 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1393 1394PHONY += modules_check 1395modules_check: modules.order 1396 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1397 1398cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1399 1400modules.order: $(subdir-modorder) FORCE 1401 $(call if_changed,modules_order) 1402 1403targets += modules.order 1404 1405# Target to prepare building external modules 1406PHONY += modules_prepare 1407modules_prepare: prepare 1408 1409# Target to install modules 1410PHONY += modules_install 1411modules_install: _modinst_ _modinst_post 1412 1413PHONY += _modinst_ 1414_modinst_: 1415 @rm -rf $(MODLIB)/kernel 1416 @rm -f $(MODLIB)/source 1417 @mkdir -p $(MODLIB)/kernel 1418 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1419 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1420 rm -f $(MODLIB)/build ; \ 1421 ln -s $(CURDIR) $(MODLIB)/build ; \ 1422 fi 1423 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1424 @cp -f modules.builtin $(MODLIB)/ 1425 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1426 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1427 1428# This depmod is only for convenience to give the initial 1429# boot a modules.dep even before / is mounted read-write. However the 1430# boot script depmod is the master version. 1431PHONY += _modinst_post 1432_modinst_post: _modinst_ 1433 $(call cmd,depmod) 1434 1435ifeq ($(CONFIG_MODULE_SIG), y) 1436PHONY += modules_sign 1437modules_sign: 1438 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1439endif 1440 1441else # CONFIG_MODULES 1442 1443# Modules not configured 1444# --------------------------------------------------------------------------- 1445 1446PHONY += modules modules_install 1447modules modules_install: 1448 @echo >&2 1449 @echo >&2 "The present kernel configuration has modules disabled." 1450 @echo >&2 "Type 'make config' and enable loadable module support." 1451 @echo >&2 "Then build a kernel with module support enabled." 1452 @echo >&2 1453 @exit 1 1454 1455endif # CONFIG_MODULES 1456 1457### 1458# Cleaning is done on three levels. 1459# make clean Delete most generated files 1460# Leave enough to build external modules 1461# make mrproper Delete the current configuration, and all generated files 1462# make distclean Remove editor backup files, patch leftover files and the like 1463 1464# Directories & files removed with 'make clean' 1465CLEAN_FILES += include/ksym vmlinux.symvers \ 1466 modules.builtin modules.builtin.modinfo modules.nsdeps 1467 1468# Directories & files removed with 'make mrproper' 1469MRPROPER_FILES += include/config include/generated \ 1470 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1471 debian snap tar-install \ 1472 .config .config.old .version \ 1473 Module.symvers \ 1474 signing_key.pem signing_key.priv signing_key.x509 \ 1475 x509.genkey extra_certificates signing_key.x509.keyid \ 1476 signing_key.x509.signer vmlinux-gdb.py \ 1477 *.spec 1478 1479# Directories & files removed with 'make distclean' 1480DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1481 1482# clean - Delete most, but leave enough to build external modules 1483# 1484clean: rm-files := $(CLEAN_FILES) 1485 1486PHONY += archclean vmlinuxclean 1487 1488vmlinuxclean: 1489 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1490 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1491 1492clean: archclean vmlinuxclean 1493 1494# mrproper - Delete all generated files, including .config 1495# 1496mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1497mrproper-dirs := $(addprefix _mrproper_,scripts) 1498 1499PHONY += $(mrproper-dirs) mrproper 1500$(mrproper-dirs): 1501 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1502 1503mrproper: clean $(mrproper-dirs) 1504 $(call cmd,rmfiles) 1505 1506# distclean 1507# 1508distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1509 1510PHONY += distclean 1511 1512distclean: mrproper 1513 $(call cmd,rmfiles) 1514 @find $(srctree) $(RCS_FIND_IGNORE) \ 1515 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1516 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1517 -o -name 'core' \) \ 1518 -type f -print | xargs rm -f 1519 1520 1521# Packaging of the kernel to various formats 1522# --------------------------------------------------------------------------- 1523 1524%src-pkg: FORCE 1525 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1526%pkg: include/config/kernel.release FORCE 1527 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1528 1529# Brief documentation of the typical targets used 1530# --------------------------------------------------------------------------- 1531 1532boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1533boards := $(sort $(notdir $(boards))) 1534board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1535board-dirs := $(sort $(notdir $(board-dirs:/=))) 1536 1537PHONY += help 1538help: 1539 @echo 'Cleaning targets:' 1540 @echo ' clean - Remove most generated files but keep the config and' 1541 @echo ' enough build support to build external modules' 1542 @echo ' mrproper - Remove all generated files + config + various backup files' 1543 @echo ' distclean - mrproper + remove editor backup and patch files' 1544 @echo '' 1545 @echo 'Configuration targets:' 1546 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1547 @echo '' 1548 @echo 'Other generic targets:' 1549 @echo ' all - Build all targets marked with [*]' 1550 @echo '* vmlinux - Build the bare kernel' 1551 @echo '* modules - Build all modules' 1552 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1553 @echo ' dir/ - Build all files in dir and below' 1554 @echo ' dir/file.[ois] - Build specified target only' 1555 @echo ' dir/file.ll - Build the LLVM assembly file' 1556 @echo ' (requires compiler support for LLVM assembly generation)' 1557 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1558 @echo ' (requires a recent binutils and recent build (System.map))' 1559 @echo ' dir/file.ko - Build module including final link' 1560 @echo ' modules_prepare - Set up for building external modules' 1561 @echo ' tags/TAGS - Generate tags file for editors' 1562 @echo ' cscope - Generate cscope index' 1563 @echo ' gtags - Generate GNU GLOBAL index' 1564 @echo ' kernelrelease - Output the release version string (use with make -s)' 1565 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1566 @echo ' image_name - Output the image name (use with make -s)' 1567 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1568 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1569 echo '' 1570 @echo 'Static analysers:' 1571 @echo ' checkstack - Generate a list of stack hogs' 1572 @echo ' namespacecheck - Name space analysis on compiled kernel' 1573 @echo ' versioncheck - Sanity check on version.h usage' 1574 @echo ' includecheck - Check for duplicate included header files' 1575 @echo ' export_report - List the usages of all exported symbols' 1576 @echo ' headerdep - Detect inclusion cycles in headers' 1577 @echo ' coccicheck - Check with Coccinelle' 1578 @echo '' 1579 @echo 'Tools:' 1580 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1581 @echo '' 1582 @echo 'Kernel selftest:' 1583 @echo ' kselftest - Build and run kernel selftest' 1584 @echo ' Build, install, and boot kernel before' 1585 @echo ' running kselftest on it' 1586 @echo ' Run as root for full coverage' 1587 @echo ' kselftest-all - Build kernel selftest' 1588 @echo ' kselftest-install - Build and install kernel selftest' 1589 @echo ' kselftest-clean - Remove all generated kselftest files' 1590 @echo ' kselftest-merge - Merge all the config dependencies of' 1591 @echo ' kselftest to existing .config.' 1592 @echo '' 1593 @$(if $(dtstree), \ 1594 echo 'Devicetree:'; \ 1595 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1596 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1597 echo ' dt_binding_check - Validate device tree binding documents'; \ 1598 echo ' dtbs_check - Validate device tree source files';\ 1599 echo '') 1600 1601 @echo 'Userspace tools targets:' 1602 @echo ' use "make tools/help"' 1603 @echo ' or "cd tools; make help"' 1604 @echo '' 1605 @echo 'Kernel packaging:' 1606 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1607 @echo '' 1608 @echo 'Documentation targets:' 1609 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1610 @echo '' 1611 @echo 'Architecture specific targets ($(SRCARCH)):' 1612 @$(if $(archhelp),$(archhelp),\ 1613 echo ' No architecture specific help defined for $(SRCARCH)') 1614 @echo '' 1615 @$(if $(boards), \ 1616 $(foreach b, $(boards), \ 1617 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1618 echo '') 1619 @$(if $(board-dirs), \ 1620 $(foreach b, $(board-dirs), \ 1621 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1622 printf " %-16s - Show all of the above\\n" help-boards; \ 1623 echo '') 1624 1625 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1626 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1627 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1628 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1629 @echo ' (sparse by default)' 1630 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1631 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1632 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1633 @echo ' 1: warnings which may be relevant and do not occur too often' 1634 @echo ' 2: warnings which occur quite often but may still be relevant' 1635 @echo ' 3: more obscure warnings, can most likely be ignored' 1636 @echo ' Multiple levels can be combined with W=12 or W=123' 1637 @echo '' 1638 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1639 @echo 'For further info see the ./README file' 1640 1641 1642help-board-dirs := $(addprefix help-,$(board-dirs)) 1643 1644help-boards: $(help-board-dirs) 1645 1646boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1647 1648$(help-board-dirs): help-%: 1649 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1650 @$(if $(boards-per-dir), \ 1651 $(foreach b, $(boards-per-dir), \ 1652 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1653 echo '') 1654 1655 1656# Documentation targets 1657# --------------------------------------------------------------------------- 1658DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1659 linkcheckdocs dochelp refcheckdocs 1660PHONY += $(DOC_TARGETS) 1661$(DOC_TARGETS): 1662 $(Q)$(MAKE) $(build)=Documentation $@ 1663 1664# Misc 1665# --------------------------------------------------------------------------- 1666 1667PHONY += scripts_gdb 1668scripts_gdb: prepare0 1669 $(Q)$(MAKE) $(build)=scripts/gdb 1670 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1671 1672ifdef CONFIG_GDB_SCRIPTS 1673all: scripts_gdb 1674endif 1675 1676else # KBUILD_EXTMOD 1677 1678### 1679# External module support. 1680# When building external modules the kernel used as basis is considered 1681# read-only, and no consistency checks are made and the make 1682# system is not used on the basis kernel. If updates are required 1683# in the basis kernel ordinary make commands (without M=...) must 1684# be used. 1685# 1686# The following are the only valid targets when building external 1687# modules. 1688# make M=dir clean Delete all automatically generated files 1689# make M=dir modules Make all modules in specified dir 1690# make M=dir Same as 'make M=dir modules' 1691# make M=dir modules_install 1692# Install the modules built in the module directory 1693# Assumes install directory is already created 1694 1695# We are always building modules 1696KBUILD_MODULES := 1 1697 1698build-dirs := $(KBUILD_EXTMOD) 1699PHONY += modules 1700modules: descend 1701 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1702 1703PHONY += modules_install 1704modules_install: _emodinst_ _emodinst_post 1705 1706install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1707PHONY += _emodinst_ 1708_emodinst_: 1709 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1710 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1711 1712PHONY += _emodinst_post 1713_emodinst_post: _emodinst_ 1714 $(call cmd,depmod) 1715 1716clean-dirs := $(KBUILD_EXTMOD) 1717clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1718 1719PHONY += help 1720help: 1721 @echo ' Building external modules.' 1722 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1723 @echo '' 1724 @echo ' modules - default target, build the module(s)' 1725 @echo ' modules_install - install the module' 1726 @echo ' clean - remove generated files in module directory only' 1727 @echo '' 1728 1729PHONY += prepare 1730endif # KBUILD_EXTMOD 1731 1732# Single targets 1733# --------------------------------------------------------------------------- 1734# To build individual files in subdirectories, you can do like this: 1735# 1736# make foo/bar/baz.s 1737# 1738# The supported suffixes for single-target are listed in 'single-targets' 1739# 1740# To build only under specific subdirectories, you can do like this: 1741# 1742# make foo/bar/baz/ 1743 1744ifdef single-build 1745 1746# .ko is special because modpost is needed 1747single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1748single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1749 1750$(single-ko): single_modpost 1751 @: 1752$(single-no-ko): descend 1753 @: 1754 1755ifeq ($(KBUILD_EXTMOD),) 1756# For the single build of in-tree modules, use a temporary file to avoid 1757# the situation of modules_install installing an invalid modules.order. 1758MODORDER := .modules.tmp 1759endif 1760 1761PHONY += single_modpost 1762single_modpost: $(single-no-ko) 1763 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1764 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1765 1766KBUILD_MODULES := 1 1767 1768export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1769 1770# trim unrelated directories 1771build-dirs := $(foreach d, $(build-dirs), \ 1772 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1773 1774endif 1775 1776ifndef CONFIG_MODULES 1777KBUILD_MODULES := 1778endif 1779 1780# Handle descending into subdirectories listed in $(build-dirs) 1781# Preset locale variables to speed up the build process. Limit locale 1782# tweaks to this spot to avoid wrong language settings when running 1783# make menuconfig etc. 1784# Error messages still appears in the original language 1785PHONY += descend $(build-dirs) 1786descend: $(build-dirs) 1787$(build-dirs): prepare 1788 $(Q)$(MAKE) $(build)=$@ \ 1789 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1790 need-builtin=1 need-modorder=1 1791 1792clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1793PHONY += $(clean-dirs) clean 1794$(clean-dirs): 1795 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1796 1797clean: $(clean-dirs) 1798 $(call cmd,rmfiles) 1799 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1800 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1801 -o -name '*.ko.*' \ 1802 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1803 -o -name '*.dwo' -o -name '*.lst' \ 1804 -o -name '*.su' -o -name '*.mod' \ 1805 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1806 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1807 -o -name '*.asn1.[ch]' \ 1808 -o -name '*.symtypes' -o -name 'modules.order' \ 1809 -o -name '.tmp_*.o.*' \ 1810 -o -name '*.c.[012]*.*' \ 1811 -o -name '*.ll' \ 1812 -o -name '*.gcno' \) -type f -print | xargs rm -f 1813 1814# Generate tags for editors 1815# --------------------------------------------------------------------------- 1816quiet_cmd_tags = GEN $@ 1817 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1818 1819tags TAGS cscope gtags: FORCE 1820 $(call cmd,tags) 1821 1822# Script to generate missing namespace dependencies 1823# --------------------------------------------------------------------------- 1824 1825PHONY += nsdeps 1826nsdeps: export KBUILD_NSDEPS=1 1827nsdeps: modules 1828 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1829 1830# Scripts to check various things for consistency 1831# --------------------------------------------------------------------------- 1832 1833PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1834 1835includecheck: 1836 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1837 -name '*.[hcS]' -type f -print | sort \ 1838 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1839 1840versioncheck: 1841 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1842 -name '*.[hcS]' -type f -print | sort \ 1843 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1844 1845coccicheck: 1846 $(Q)$(BASH) $(srctree)/scripts/$@ 1847 1848namespacecheck: 1849 $(PERL) $(srctree)/scripts/namespace.pl 1850 1851export_report: 1852 $(PERL) $(srctree)/scripts/export_report.pl 1853 1854PHONY += checkstack kernelrelease kernelversion image_name 1855 1856# UML needs a little special treatment here. It wants to use the host 1857# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1858# else wants $(ARCH), including people doing cross-builds, which means 1859# that $(SUBARCH) doesn't work here. 1860ifeq ($(ARCH), um) 1861CHECKSTACK_ARCH := $(SUBARCH) 1862else 1863CHECKSTACK_ARCH := $(ARCH) 1864endif 1865checkstack: 1866 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1867 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1868 1869kernelrelease: 1870 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1871 1872kernelversion: 1873 @echo $(KERNELVERSION) 1874 1875image_name: 1876 @echo $(KBUILD_IMAGE) 1877 1878# Clear a bunch of variables before executing the submake 1879 1880ifeq ($(quiet),silent_) 1881tools_silent=s 1882endif 1883 1884tools/: FORCE 1885 $(Q)mkdir -p $(objtree)/tools 1886 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1887 1888tools/%: FORCE 1889 $(Q)mkdir -p $(objtree)/tools 1890 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1891 1892quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1893 cmd_rmfiles = rm -rf $(rm-files) 1894 1895# Run depmod only if we have System.map and depmod is executable 1896quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1897 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1898 $(KERNELRELEASE) 1899 1900# read saved command lines for existing targets 1901existing-targets := $(wildcard $(sort $(targets))) 1902 1903-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1904 1905endif # config-build 1906endif # mixed-build 1907endif # need-sub-make 1908 1909PHONY += FORCE 1910FORCE: 1911 1912# Declare the contents of the PHONY variable as phony. We keep that 1913# information in a variable so we can use it in if_changed and friends. 1914.PHONY: $(PHONY) 1915