1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 7 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 451LEX = flex 452YACC = bison 453AWK = awk 454INSTALLKERNEL := installkernel 455DEPMOD = /sbin/depmod 456PERL = perl 457PYTHON = python 458PYTHON3 = python3 459CHECK = sparse 460BASH = bash 461GZIP = gzip 462BZIP2 = bzip2 463LZOP = lzop 464LZMA = lzma 465LZ4 = lz4c 466XZ = xz 467 468# GZIP, BZIP2, LZOP env vars are used by the tools. Support them as the command 469# line interface, but use _GZIP, _BZIP2, _LZOP internally. 470_GZIP := $(GZIP) 471_BZIP2 := $(BZIP2) 472_LZOP := $(LZOP) 473 474# Reset GZIP, BZIP2, LZOP in this Makefile 475override GZIP= 476override BZIP2= 477override LZOP= 478 479# Reset GZIP, BZIP2, LZOP in recursive invocations 480MAKEOVERRIDES += GZIP= BZIP2= LZOP= 481 482CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 483 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 484NOSTDINC_FLAGS := 485CFLAGS_MODULE = 486AFLAGS_MODULE = 487LDFLAGS_MODULE = 488CFLAGS_KERNEL = 489AFLAGS_KERNEL = 490LDFLAGS_vmlinux = 491 492# Use USERINCLUDE when you must reference the UAPI directories only. 493USERINCLUDE := \ 494 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 495 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 496 -I$(srctree)/include/uapi \ 497 -I$(objtree)/include/generated/uapi \ 498 -include $(srctree)/include/linux/kconfig.h 499 500# Use LINUXINCLUDE when you must reference the include/ directory. 501# Needed to be compatible with the O= option 502LINUXINCLUDE := \ 503 -I$(srctree)/arch/$(SRCARCH)/include \ 504 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 505 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 506 -I$(objtree)/include \ 507 $(USERINCLUDE) 508 509KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 510KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 511 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 512 -Werror=implicit-function-declaration -Werror=implicit-int \ 513 -Wno-format-security \ 514 -std=gnu89 515KBUILD_CPPFLAGS := -D__KERNEL__ 516KBUILD_AFLAGS_KERNEL := 517KBUILD_CFLAGS_KERNEL := 518KBUILD_AFLAGS_MODULE := -DMODULE 519KBUILD_CFLAGS_MODULE := -DMODULE 520KBUILD_LDFLAGS_MODULE := 521export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 522KBUILD_LDFLAGS := 523GCC_PLUGINS_CFLAGS := 524CLANG_FLAGS := 525 526export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 527export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL 528export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 529export _GZIP _BZIP2 _LZOP LZMA LZ4 XZ 530export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 531 532export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 533export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 534export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 535export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 536export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 537export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 538 539# Files to ignore in find ... statements 540 541export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 542 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 543 -prune -o 544export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 545 --exclude CVS --exclude .pc --exclude .hg --exclude .git 546 547# =========================================================================== 548# Rules shared between *config targets and build targets 549 550# Basic helpers built in scripts/basic/ 551PHONY += scripts_basic 552scripts_basic: 553 $(Q)$(MAKE) $(build)=scripts/basic 554 $(Q)rm -f .tmp_quiet_recordmcount 555 556PHONY += outputmakefile 557# Before starting out-of-tree build, make sure the source tree is clean. 558# outputmakefile generates a Makefile in the output directory, if using a 559# separate output directory. This allows convenient use of make in the 560# output directory. 561# At the same time when output Makefile generated, generate .gitignore to 562# ignore whole output directory 563outputmakefile: 564ifdef building_out_of_srctree 565 $(Q)if [ -f $(srctree)/.config -o \ 566 -d $(srctree)/include/config -o \ 567 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 568 echo >&2 "***"; \ 569 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 570 echo >&2 "*** in $(abs_srctree)";\ 571 echo >&2 "***"; \ 572 false; \ 573 fi 574 $(Q)ln -fsn $(srctree) source 575 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 576 $(Q)test -e .gitignore || \ 577 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 578endif 579 580ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 581ifneq ($(CROSS_COMPILE),) 582CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 583GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 584CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 585GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 586endif 587ifneq ($(GCC_TOOLCHAIN),) 588CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 589endif 590ifneq ($(LLVM_IAS),1) 591CLANG_FLAGS += -no-integrated-as 592endif 593CLANG_FLAGS += -Werror=unknown-warning-option 594KBUILD_CFLAGS += $(CLANG_FLAGS) 595KBUILD_AFLAGS += $(CLANG_FLAGS) 596export CLANG_FLAGS 597endif 598 599# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 600# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 601# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 602# and from include/config/auto.conf.cmd to detect the compiler upgrade. 603CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 604 605ifdef config-build 606# =========================================================================== 607# *config targets only - make sure prerequisites are updated, and descend 608# in scripts/kconfig to make the *config target 609 610# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 611# KBUILD_DEFCONFIG may point out an alternative default configuration 612# used for 'make defconfig' 613include arch/$(SRCARCH)/Makefile 614export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 615 616config: outputmakefile scripts_basic FORCE 617 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 618 619%config: outputmakefile scripts_basic FORCE 620 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 621 622else #!config-build 623# =========================================================================== 624# Build targets only - this includes vmlinux, arch specific targets, clean 625# targets and others. In general all targets except *config targets. 626 627# If building an external module we do not care about the all: rule 628# but instead __all depend on modules 629PHONY += all 630ifeq ($(KBUILD_EXTMOD),) 631__all: all 632else 633__all: modules 634endif 635 636# Decide whether to build built-in, modular, or both. 637# Normally, just do built-in. 638 639KBUILD_MODULES := 640KBUILD_BUILTIN := 1 641 642# If we have only "make modules", don't compile built-in objects. 643ifeq ($(MAKECMDGOALS),modules) 644 KBUILD_BUILTIN := 645endif 646 647# If we have "make <whatever> modules", compile modules 648# in addition to whatever we do anyway. 649# Just "make" or "make all" shall build modules as well 650 651ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 652 KBUILD_MODULES := 1 653endif 654 655ifeq ($(MAKECMDGOALS),) 656 KBUILD_MODULES := 1 657endif 658 659export KBUILD_MODULES KBUILD_BUILTIN 660 661ifdef need-config 662include include/config/auto.conf 663endif 664 665ifeq ($(KBUILD_EXTMOD),) 666# Objects we will link into vmlinux / subdirs we need to visit 667core-y := init/ usr/ 668drivers-y := drivers/ sound/ 669drivers-$(CONFIG_SAMPLES) += samples/ 670drivers-y += net/ virt/ 671libs-y := lib/ 672endif # KBUILD_EXTMOD 673 674# The all: target is the default when no target is given on the 675# command line. 676# This allow a user to issue only 'make' to build a kernel including modules 677# Defaults to vmlinux, but the arch makefile usually adds further targets 678all: vmlinux 679 680CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 681 $(call cc-option,-fno-tree-loop-im) \ 682 $(call cc-disable-warning,maybe-uninitialized,) 683export CFLAGS_GCOV 684 685# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 686ifdef CONFIG_FUNCTION_TRACER 687 CC_FLAGS_FTRACE := -pg 688endif 689 690RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 691RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 692RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 693RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 694RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 695RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 696export RETPOLINE_CFLAGS 697export RETPOLINE_VDSO_CFLAGS 698 699include arch/$(SRCARCH)/Makefile 700 701ifdef need-config 702ifdef may-sync-config 703# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 704# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 705# because some architectures define CROSS_COMPILE there. 706include include/config/auto.conf.cmd 707 708$(KCONFIG_CONFIG): 709 @echo >&2 '***' 710 @echo >&2 '*** Configuration file "$@" not found!' 711 @echo >&2 '***' 712 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 713 @echo >&2 '*** "make menuconfig" or "make xconfig").' 714 @echo >&2 '***' 715 @/bin/false 716 717# The actual configuration files used during the build are stored in 718# include/generated/ and include/config/. Update them if .config is newer than 719# include/config/auto.conf (which mirrors .config). 720# 721# This exploits the 'multi-target pattern rule' trick. 722# The syncconfig should be executed only once to make all the targets. 723# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 724%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 725 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 726else # !may-sync-config 727# External modules and some install targets need include/generated/autoconf.h 728# and include/config/auto.conf but do not care if they are up-to-date. 729# Use auto.conf to trigger the test 730PHONY += include/config/auto.conf 731 732include/config/auto.conf: 733 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 734 echo >&2; \ 735 echo >&2 " ERROR: Kernel configuration is invalid."; \ 736 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 737 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 738 echo >&2 ; \ 739 /bin/false) 740 741endif # may-sync-config 742endif # need-config 743 744KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 745KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 746KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 747KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 748KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 749 750ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 751KBUILD_CFLAGS += -O2 752else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 753KBUILD_CFLAGS += -O3 754else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 755KBUILD_CFLAGS += -Os 756endif 757 758# Tell gcc to never replace conditional load with a non-conditional one 759KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 760KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 761 762include scripts/Makefile.kcov 763include scripts/Makefile.gcc-plugins 764 765ifdef CONFIG_READABLE_ASM 766# Disable optimizations that make assembler listings hard to read. 767# reorder blocks reorders the control in the function 768# ipa clone creates specialized cloned functions 769# partial inlining inlines only parts of functions 770KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 771 $(call cc-option,-fno-ipa-cp-clone,) \ 772 $(call cc-option,-fno-partial-inlining) 773endif 774 775ifneq ($(CONFIG_FRAME_WARN),0) 776KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 777endif 778 779stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 780stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 781stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 782 783KBUILD_CFLAGS += $(stackp-flags-y) 784 785ifdef CONFIG_CC_IS_CLANG 786KBUILD_CPPFLAGS += -Qunused-arguments 787KBUILD_CFLAGS += -Wno-format-invalid-specifier 788KBUILD_CFLAGS += -Wno-gnu 789# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 790# source of a reference will be _MergedGlobals and not on of the whitelisted names. 791# See modpost pattern 2 792KBUILD_CFLAGS += -mno-global-merge 793else 794 795# These warnings generated too much noise in a regular build. 796# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 797KBUILD_CFLAGS += -Wno-unused-but-set-variable 798 799# Warn about unmarked fall-throughs in switch statement. 800# Disabled for clang while comment to attribute conversion happens and 801# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 802KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 803endif 804 805KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 806ifdef CONFIG_FRAME_POINTER 807KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 808else 809# Some targets (ARM with Thumb2, for example), can't be built with frame 810# pointers. For those, we don't have FUNCTION_TRACER automatically 811# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 812# incompatible with -fomit-frame-pointer with current GCC, so we don't use 813# -fomit-frame-pointer with FUNCTION_TRACER. 814ifndef CONFIG_FUNCTION_TRACER 815KBUILD_CFLAGS += -fomit-frame-pointer 816endif 817endif 818 819# Initialize all stack variables with a pattern, if desired. 820ifdef CONFIG_INIT_STACK_ALL 821KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 822endif 823 824DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 825 826ifdef CONFIG_DEBUG_INFO 827ifdef CONFIG_DEBUG_INFO_SPLIT 828DEBUG_CFLAGS += -gsplit-dwarf 829else 830DEBUG_CFLAGS += -g 831endif 832KBUILD_AFLAGS += -Wa,-gdwarf-2 833endif 834ifdef CONFIG_DEBUG_INFO_DWARF4 835DEBUG_CFLAGS += -gdwarf-4 836endif 837 838ifdef CONFIG_DEBUG_INFO_REDUCED 839DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 840 $(call cc-option,-fno-var-tracking) 841endif 842 843ifdef CONFIG_DEBUG_INFO_COMPRESSED 844DEBUG_CFLAGS += -gz=zlib 845KBUILD_AFLAGS += -Wa,--compress-debug-sections=zlib 846KBUILD_LDFLAGS += --compress-debug-sections=zlib 847endif 848 849KBUILD_CFLAGS += $(DEBUG_CFLAGS) 850export DEBUG_CFLAGS 851 852ifdef CONFIG_FUNCTION_TRACER 853ifdef CONFIG_FTRACE_MCOUNT_RECORD 854 # gcc 5 supports generating the mcount tables directly 855 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 856 CC_FLAGS_FTRACE += -mrecord-mcount 857 export CC_USING_RECORD_MCOUNT := 1 858 endif 859 ifdef CONFIG_HAVE_NOP_MCOUNT 860 ifeq ($(call cc-option-yn, -mnop-mcount),y) 861 CC_FLAGS_FTRACE += -mnop-mcount 862 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 863 endif 864 endif 865endif 866ifdef CONFIG_HAVE_FENTRY 867 ifeq ($(call cc-option-yn, -mfentry),y) 868 CC_FLAGS_FTRACE += -mfentry 869 CC_FLAGS_USING += -DCC_USING_FENTRY 870 endif 871endif 872export CC_FLAGS_FTRACE 873KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 874KBUILD_AFLAGS += $(CC_FLAGS_USING) 875ifdef CONFIG_DYNAMIC_FTRACE 876 ifdef CONFIG_HAVE_C_RECORDMCOUNT 877 BUILD_C_RECORDMCOUNT := y 878 export BUILD_C_RECORDMCOUNT 879 endif 880endif 881endif 882 883# We trigger additional mismatches with less inlining 884ifdef CONFIG_DEBUG_SECTION_MISMATCH 885KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 886endif 887 888ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 889KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 890LDFLAGS_vmlinux += --gc-sections 891endif 892 893ifdef CONFIG_LIVEPATCH 894KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 895endif 896 897ifdef CONFIG_SHADOW_CALL_STACK 898CC_FLAGS_SCS := -fsanitize=shadow-call-stack 899KBUILD_CFLAGS += $(CC_FLAGS_SCS) 900export CC_FLAGS_SCS 901endif 902 903# arch Makefile may override CC so keep this after arch Makefile is included 904NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 905 906# warn about C99 declaration after statement 907KBUILD_CFLAGS += -Wdeclaration-after-statement 908 909# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 910KBUILD_CFLAGS += -Wvla 911 912# disable pointer signed / unsigned warnings in gcc 4.0 913KBUILD_CFLAGS += -Wno-pointer-sign 914 915# disable stringop warnings in gcc 8+ 916KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 917 918# We'll want to enable this eventually, but it's not going away for 5.7 at least 919KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 920KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 921KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 922 923# Another good warning that we'll want to enable eventually 924KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 925 926# Enabled with W=2, disabled by default as noisy 927KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 928 929# disable invalid "can't wrap" optimizations for signed / pointers 930KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 931 932# clang sets -fmerge-all-constants by default as optimization, but this 933# is non-conforming behavior for C and in fact breaks the kernel, so we 934# need to disable it here generally. 935KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 936 937# for gcc -fno-merge-all-constants disables everything, but it is fine 938# to have actual conforming behavior enabled. 939KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 940 941# Make sure -fstack-check isn't enabled (like gentoo apparently did) 942KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 943 944# conserve stack if available 945KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 946 947# Prohibit date/time macros, which would make the build non-deterministic 948KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 949 950# enforce correct pointer usage 951KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 952 953# Require designated initializers for all marked structures 954KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 955 956# change __FILE__ to the relative path from the srctree 957KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 958 959# ensure -fcf-protection is disabled when using retpoline as it is 960# incompatible with -mindirect-branch=thunk-extern 961ifdef CONFIG_RETPOLINE 962KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 963endif 964 965include scripts/Makefile.kasan 966include scripts/Makefile.extrawarn 967include scripts/Makefile.ubsan 968 969# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 970KBUILD_CPPFLAGS += $(KCPPFLAGS) 971KBUILD_AFLAGS += $(KAFLAGS) 972KBUILD_CFLAGS += $(KCFLAGS) 973 974KBUILD_LDFLAGS_MODULE += --build-id 975LDFLAGS_vmlinux += --build-id 976 977ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 978LDFLAGS_vmlinux += $(call ld-option, -X,) 979endif 980 981ifeq ($(CONFIG_RELR),y) 982LDFLAGS_vmlinux += --pack-dyn-relocs=relr 983endif 984 985# Align the bit size of userspace programs with the kernel 986KBUILD_USERCFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS)) 987KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS)) 988 989# make the checker run with the right architecture 990CHECKFLAGS += --arch=$(ARCH) 991 992# insure the checker run with the right endianness 993CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 994 995# the checker needs the correct machine size 996CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 997 998# Default kernel image to build when no specific target is given. 999# KBUILD_IMAGE may be overruled on the command line or 1000# set in the environment 1001# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1002# this default value 1003export KBUILD_IMAGE ?= vmlinux 1004 1005# 1006# INSTALL_PATH specifies where to place the updated kernel and system map 1007# images. Default is /boot, but you can set it to other values 1008export INSTALL_PATH ?= /boot 1009 1010# 1011# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1012# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1013# an argument if needed. Otherwise it defaults to the kernel install path 1014# 1015export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1016 1017# 1018# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1019# relocations required by build roots. This is not defined in the 1020# makefile but the argument can be passed to make if needed. 1021# 1022 1023MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1024export MODLIB 1025 1026# 1027# INSTALL_MOD_STRIP, if defined, will cause modules to be 1028# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1029# the default option --strip-debug will be used. Otherwise, 1030# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1031 1032ifdef INSTALL_MOD_STRIP 1033ifeq ($(INSTALL_MOD_STRIP),1) 1034mod_strip_cmd = $(STRIP) --strip-debug 1035else 1036mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1037endif # INSTALL_MOD_STRIP=1 1038else 1039mod_strip_cmd = true 1040endif # INSTALL_MOD_STRIP 1041export mod_strip_cmd 1042 1043# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1044# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1045# or CONFIG_MODULE_COMPRESS_XZ. 1046 1047mod_compress_cmd = true 1048ifdef CONFIG_MODULE_COMPRESS 1049 ifdef CONFIG_MODULE_COMPRESS_GZIP 1050 mod_compress_cmd = $(_GZIP) -n -f 1051 endif # CONFIG_MODULE_COMPRESS_GZIP 1052 ifdef CONFIG_MODULE_COMPRESS_XZ 1053 mod_compress_cmd = $(XZ) -f 1054 endif # CONFIG_MODULE_COMPRESS_XZ 1055endif # CONFIG_MODULE_COMPRESS 1056export mod_compress_cmd 1057 1058ifdef CONFIG_MODULE_SIG_ALL 1059$(eval $(call config_filename,MODULE_SIG_KEY)) 1060 1061mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1062else 1063mod_sign_cmd = true 1064endif 1065export mod_sign_cmd 1066 1067HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1068 1069ifdef CONFIG_STACK_VALIDATION 1070 has_libelf := $(call try-run,\ 1071 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1072 ifeq ($(has_libelf),1) 1073 objtool_target := tools/objtool FORCE 1074 else 1075 SKIP_STACK_VALIDATION := 1 1076 export SKIP_STACK_VALIDATION 1077 endif 1078endif 1079 1080PHONY += prepare0 1081 1082export MODORDER := $(extmod-prefix)modules.order 1083export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1084 1085ifeq ($(KBUILD_EXTMOD),) 1086core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1087 1088vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1089 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1090 $(libs-y) $(libs-m))) 1091 1092vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1093 $(patsubst %/,%,$(filter %/, $(core-) \ 1094 $(drivers-) $(libs-)))) 1095 1096subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1097 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1098 $(drivers-y) $(drivers-m))) 1099 1100build-dirs := $(vmlinux-dirs) 1101clean-dirs := $(vmlinux-alldirs) 1102 1103# Externally visible symbols (used by link-vmlinux.sh) 1104KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1105KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1106ifdef CONFIG_MODULES 1107KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1108KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1109else 1110KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1111endif 1112KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1113 1114export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1115export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1116export LDFLAGS_vmlinux 1117# used by scripts/Makefile.package 1118export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1119 1120vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1121 1122# Recurse until adjust_autoksyms.sh is satisfied 1123PHONY += autoksyms_recursive 1124ifdef CONFIG_TRIM_UNUSED_KSYMS 1125# For the kernel to actually contain only the needed exported symbols, 1126# we have to build modules as well to determine what those symbols are. 1127# (this can be evaluated only once include/config/auto.conf has been included) 1128KBUILD_MODULES := 1 1129 1130autoksyms_recursive: descend modules.order 1131 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1132 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1133endif 1134 1135autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1136 1137quiet_cmd_autoksyms_h = GEN $@ 1138 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1139 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1140 1141$(autoksyms_h): 1142 $(call cmd,autoksyms_h) 1143 1144ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1145 1146# Final link of vmlinux with optional arch pass after final link 1147cmd_link-vmlinux = \ 1148 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1149 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1150 1151vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1152 +$(call if_changed,link-vmlinux) 1153 1154targets := vmlinux 1155 1156# The actual objects are generated when descending, 1157# make sure no implicit rule kicks in 1158$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1159 1160filechk_kernel.release = \ 1161 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1162 1163# Store (new) KERNELRELEASE string in include/config/kernel.release 1164include/config/kernel.release: FORCE 1165 $(call filechk,kernel.release) 1166 1167# Additional helpers built in scripts/ 1168# Carefully list dependencies so we do not try to build scripts twice 1169# in parallel 1170PHONY += scripts 1171scripts: scripts_basic scripts_dtc 1172 $(Q)$(MAKE) $(build)=$(@) 1173 1174# Things we need to do before we recursively start building the kernel 1175# or the modules are listed in "prepare". 1176# A multi level approach is used. prepareN is processed before prepareN-1. 1177# archprepare is used in arch Makefiles and when processed asm symlink, 1178# version.h and scripts_basic is processed / created. 1179 1180PHONY += prepare archprepare 1181 1182archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1183 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1184 include/generated/autoconf.h 1185 1186prepare0: archprepare 1187 $(Q)$(MAKE) $(build)=scripts/mod 1188 $(Q)$(MAKE) $(build)=. 1189 1190# All the preparing.. 1191prepare: prepare0 prepare-objtool 1192 1193# Support for using generic headers in asm-generic 1194asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1195 1196PHONY += asm-generic uapi-asm-generic 1197asm-generic: uapi-asm-generic 1198 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1199 generic=include/asm-generic 1200uapi-asm-generic: 1201 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1202 generic=include/uapi/asm-generic 1203 1204PHONY += prepare-objtool 1205prepare-objtool: $(objtool_target) 1206ifeq ($(SKIP_STACK_VALIDATION),1) 1207ifdef CONFIG_UNWINDER_ORC 1208 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1209 @false 1210else 1211 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1212endif 1213endif 1214 1215# Generate some files 1216# --------------------------------------------------------------------------- 1217 1218# KERNELRELEASE can change from a few different places, meaning version.h 1219# needs to be updated, so this check is forced on all builds 1220 1221uts_len := 64 1222define filechk_utsrelease.h 1223 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1224 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1225 exit 1; \ 1226 fi; \ 1227 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1228endef 1229 1230define filechk_version.h 1231 echo \#define LINUX_VERSION_CODE $(shell \ 1232 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1233 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1234endef 1235 1236$(version_h): FORCE 1237 $(call filechk,version.h) 1238 $(Q)rm -f $(old_version_h) 1239 1240include/generated/utsrelease.h: include/config/kernel.release FORCE 1241 $(call filechk,utsrelease.h) 1242 1243PHONY += headerdep 1244headerdep: 1245 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1246 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1247 1248# --------------------------------------------------------------------------- 1249# Kernel headers 1250 1251#Default location for installed headers 1252export INSTALL_HDR_PATH = $(objtree)/usr 1253 1254quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1255 cmd_headers_install = \ 1256 mkdir -p $(INSTALL_HDR_PATH); \ 1257 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1258 usr/include $(INSTALL_HDR_PATH) 1259 1260PHONY += headers_install 1261headers_install: headers 1262 $(call cmd,headers_install) 1263 1264PHONY += archheaders archscripts 1265 1266hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1267 1268PHONY += headers 1269headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1270 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1271 $(error Headers not exportable for the $(SRCARCH) architecture)) 1272 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1273 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1274 1275# Deprecated. It is no-op now. 1276PHONY += headers_check 1277headers_check: 1278 @: 1279 1280ifdef CONFIG_HEADERS_INSTALL 1281prepare: headers 1282endif 1283 1284PHONY += scripts_unifdef 1285scripts_unifdef: scripts_basic 1286 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1287 1288# --------------------------------------------------------------------------- 1289# Kernel selftest 1290 1291PHONY += kselftest 1292kselftest: 1293 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1294 1295kselftest-%: FORCE 1296 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1297 1298PHONY += kselftest-merge 1299kselftest-merge: 1300 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1301 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1302 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1303 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1304 1305# --------------------------------------------------------------------------- 1306# Devicetree files 1307 1308ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1309dtstree := arch/$(SRCARCH)/boot/dts 1310endif 1311 1312ifneq ($(dtstree),) 1313 1314%.dtb: include/config/kernel.release scripts_dtc 1315 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1316 1317PHONY += dtbs dtbs_install dtbs_check 1318dtbs: include/config/kernel.release scripts_dtc 1319 $(Q)$(MAKE) $(build)=$(dtstree) 1320 1321ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1322export CHECK_DTBS=y 1323dtbs: dt_binding_check 1324endif 1325 1326dtbs_check: dtbs 1327 1328dtbs_install: 1329 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1330 1331ifdef CONFIG_OF_EARLY_FLATTREE 1332all: dtbs 1333endif 1334 1335endif 1336 1337PHONY += scripts_dtc 1338scripts_dtc: scripts_basic 1339 $(Q)$(MAKE) $(build)=scripts/dtc 1340 1341ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1342export CHECK_DT_BINDING=y 1343endif 1344 1345PHONY += dt_binding_check 1346dt_binding_check: scripts_dtc 1347 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1348 1349# --------------------------------------------------------------------------- 1350# Modules 1351 1352# install modules.builtin regardless of CONFIG_MODULES 1353PHONY += _builtin_inst_ 1354_builtin_inst_: 1355 @mkdir -p $(MODLIB)/ 1356 @cp -f modules.builtin $(MODLIB)/ 1357 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1358 1359PHONY += install 1360install: _builtin_inst_ 1361 1362ifdef CONFIG_MODULES 1363 1364# By default, build modules as well 1365 1366all: modules 1367 1368# When we're building modules with modversions, we need to consider 1369# the built-in objects during the descend as well, in order to 1370# make sure the checksums are up to date before we record them. 1371ifdef CONFIG_MODVERSIONS 1372 KBUILD_BUILTIN := 1 1373endif 1374 1375# Build modules 1376# 1377# A module can be listed more than once in obj-m resulting in 1378# duplicate lines in modules.order files. Those are removed 1379# using awk while concatenating to the final file. 1380 1381PHONY += modules 1382modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1383 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1384 1385PHONY += modules_check 1386modules_check: modules.order 1387 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1388 1389cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1390 1391modules.order: $(subdir-modorder) FORCE 1392 $(call if_changed,modules_order) 1393 1394targets += modules.order 1395 1396# Target to prepare building external modules 1397PHONY += modules_prepare 1398modules_prepare: prepare 1399 1400# Target to install modules 1401PHONY += modules_install 1402modules_install: _modinst_ _modinst_post 1403 1404PHONY += _modinst_ 1405_modinst_: _builtin_inst_ 1406 @rm -rf $(MODLIB)/kernel 1407 @rm -f $(MODLIB)/source 1408 @mkdir -p $(MODLIB)/kernel 1409 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1410 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1411 rm -f $(MODLIB)/build ; \ 1412 ln -s $(CURDIR) $(MODLIB)/build ; \ 1413 fi 1414 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1415 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1416 1417# This depmod is only for convenience to give the initial 1418# boot a modules.dep even before / is mounted read-write. However the 1419# boot script depmod is the master version. 1420PHONY += _modinst_post 1421_modinst_post: _modinst_ 1422 $(call cmd,depmod) 1423 1424ifeq ($(CONFIG_MODULE_SIG), y) 1425PHONY += modules_sign 1426modules_sign: 1427 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1428endif 1429 1430else # CONFIG_MODULES 1431 1432# Modules not configured 1433# --------------------------------------------------------------------------- 1434 1435PHONY += modules modules_install 1436modules modules_install: 1437 @echo >&2 1438 @echo >&2 "The present kernel configuration has modules disabled." 1439 @echo >&2 "Type 'make config' and enable loadable module support." 1440 @echo >&2 "Then build a kernel with module support enabled." 1441 @echo >&2 1442 @exit 1 1443 1444endif # CONFIG_MODULES 1445 1446### 1447# Cleaning is done on three levels. 1448# make clean Delete most generated files 1449# Leave enough to build external modules 1450# make mrproper Delete the current configuration, and all generated files 1451# make distclean Remove editor backup files, patch leftover files and the like 1452 1453# Directories & files removed with 'make clean' 1454CLEAN_FILES += include/ksym vmlinux.symvers \ 1455 modules.builtin modules.builtin.modinfo modules.nsdeps 1456 1457# Directories & files removed with 'make mrproper' 1458MRPROPER_FILES += include/config include/generated \ 1459 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1460 debian snap tar-install \ 1461 .config .config.old .version \ 1462 Module.symvers \ 1463 signing_key.pem signing_key.priv signing_key.x509 \ 1464 x509.genkey extra_certificates signing_key.x509.keyid \ 1465 signing_key.x509.signer vmlinux-gdb.py \ 1466 *.spec 1467 1468# Directories & files removed with 'make distclean' 1469DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1470 1471# clean - Delete most, but leave enough to build external modules 1472# 1473clean: rm-files := $(CLEAN_FILES) 1474 1475PHONY += archclean vmlinuxclean 1476 1477vmlinuxclean: 1478 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1479 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1480 1481clean: archclean vmlinuxclean 1482 1483# mrproper - Delete all generated files, including .config 1484# 1485mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1486mrproper-dirs := $(addprefix _mrproper_,scripts) 1487 1488PHONY += $(mrproper-dirs) mrproper 1489$(mrproper-dirs): 1490 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1491 1492mrproper: clean $(mrproper-dirs) 1493 $(call cmd,rmfiles) 1494 1495# distclean 1496# 1497distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1498 1499PHONY += distclean 1500 1501distclean: mrproper 1502 $(call cmd,rmfiles) 1503 @find $(srctree) $(RCS_FIND_IGNORE) \ 1504 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1505 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1506 -o -name 'core' \) \ 1507 -type f -print | xargs rm -f 1508 1509 1510# Packaging of the kernel to various formats 1511# --------------------------------------------------------------------------- 1512 1513%src-pkg: FORCE 1514 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1515%pkg: include/config/kernel.release FORCE 1516 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1517 1518# Brief documentation of the typical targets used 1519# --------------------------------------------------------------------------- 1520 1521boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1522boards := $(sort $(notdir $(boards))) 1523board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1524board-dirs := $(sort $(notdir $(board-dirs:/=))) 1525 1526PHONY += help 1527help: 1528 @echo 'Cleaning targets:' 1529 @echo ' clean - Remove most generated files but keep the config and' 1530 @echo ' enough build support to build external modules' 1531 @echo ' mrproper - Remove all generated files + config + various backup files' 1532 @echo ' distclean - mrproper + remove editor backup and patch files' 1533 @echo '' 1534 @echo 'Configuration targets:' 1535 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1536 @echo '' 1537 @echo 'Other generic targets:' 1538 @echo ' all - Build all targets marked with [*]' 1539 @echo '* vmlinux - Build the bare kernel' 1540 @echo '* modules - Build all modules' 1541 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1542 @echo ' dir/ - Build all files in dir and below' 1543 @echo ' dir/file.[ois] - Build specified target only' 1544 @echo ' dir/file.ll - Build the LLVM assembly file' 1545 @echo ' (requires compiler support for LLVM assembly generation)' 1546 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1547 @echo ' (requires a recent binutils and recent build (System.map))' 1548 @echo ' dir/file.ko - Build module including final link' 1549 @echo ' modules_prepare - Set up for building external modules' 1550 @echo ' tags/TAGS - Generate tags file for editors' 1551 @echo ' cscope - Generate cscope index' 1552 @echo ' gtags - Generate GNU GLOBAL index' 1553 @echo ' kernelrelease - Output the release version string (use with make -s)' 1554 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1555 @echo ' image_name - Output the image name (use with make -s)' 1556 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1557 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1558 echo '' 1559 @echo 'Static analysers:' 1560 @echo ' checkstack - Generate a list of stack hogs' 1561 @echo ' namespacecheck - Name space analysis on compiled kernel' 1562 @echo ' versioncheck - Sanity check on version.h usage' 1563 @echo ' includecheck - Check for duplicate included header files' 1564 @echo ' export_report - List the usages of all exported symbols' 1565 @echo ' headerdep - Detect inclusion cycles in headers' 1566 @echo ' coccicheck - Check with Coccinelle' 1567 @echo '' 1568 @echo 'Tools:' 1569 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1570 @echo '' 1571 @echo 'Kernel selftest:' 1572 @echo ' kselftest - Build and run kernel selftest' 1573 @echo ' Build, install, and boot kernel before' 1574 @echo ' running kselftest on it' 1575 @echo ' Run as root for full coverage' 1576 @echo ' kselftest-all - Build kernel selftest' 1577 @echo ' kselftest-install - Build and install kernel selftest' 1578 @echo ' kselftest-clean - Remove all generated kselftest files' 1579 @echo ' kselftest-merge - Merge all the config dependencies of' 1580 @echo ' kselftest to existing .config.' 1581 @echo '' 1582 @$(if $(dtstree), \ 1583 echo 'Devicetree:'; \ 1584 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1585 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1586 echo ' dt_binding_check - Validate device tree binding documents'; \ 1587 echo ' dtbs_check - Validate device tree source files';\ 1588 echo '') 1589 1590 @echo 'Userspace tools targets:' 1591 @echo ' use "make tools/help"' 1592 @echo ' or "cd tools; make help"' 1593 @echo '' 1594 @echo 'Kernel packaging:' 1595 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1596 @echo '' 1597 @echo 'Documentation targets:' 1598 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1599 @echo '' 1600 @echo 'Architecture specific targets ($(SRCARCH)):' 1601 @$(if $(archhelp),$(archhelp),\ 1602 echo ' No architecture specific help defined for $(SRCARCH)') 1603 @echo '' 1604 @$(if $(boards), \ 1605 $(foreach b, $(boards), \ 1606 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1607 echo '') 1608 @$(if $(board-dirs), \ 1609 $(foreach b, $(board-dirs), \ 1610 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1611 printf " %-16s - Show all of the above\\n" help-boards; \ 1612 echo '') 1613 1614 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1615 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1616 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1617 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1618 @echo ' (sparse by default)' 1619 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1620 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1621 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1622 @echo ' 1: warnings which may be relevant and do not occur too often' 1623 @echo ' 2: warnings which occur quite often but may still be relevant' 1624 @echo ' 3: more obscure warnings, can most likely be ignored' 1625 @echo ' Multiple levels can be combined with W=12 or W=123' 1626 @echo '' 1627 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1628 @echo 'For further info see the ./README file' 1629 1630 1631help-board-dirs := $(addprefix help-,$(board-dirs)) 1632 1633help-boards: $(help-board-dirs) 1634 1635boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1636 1637$(help-board-dirs): help-%: 1638 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1639 @$(if $(boards-per-dir), \ 1640 $(foreach b, $(boards-per-dir), \ 1641 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1642 echo '') 1643 1644 1645# Documentation targets 1646# --------------------------------------------------------------------------- 1647DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1648 linkcheckdocs dochelp refcheckdocs 1649PHONY += $(DOC_TARGETS) 1650$(DOC_TARGETS): 1651 $(Q)$(MAKE) $(build)=Documentation $@ 1652 1653# Misc 1654# --------------------------------------------------------------------------- 1655 1656PHONY += scripts_gdb 1657scripts_gdb: prepare0 1658 $(Q)$(MAKE) $(build)=scripts/gdb 1659 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1660 1661ifdef CONFIG_GDB_SCRIPTS 1662all: scripts_gdb 1663endif 1664 1665else # KBUILD_EXTMOD 1666 1667### 1668# External module support. 1669# When building external modules the kernel used as basis is considered 1670# read-only, and no consistency checks are made and the make 1671# system is not used on the basis kernel. If updates are required 1672# in the basis kernel ordinary make commands (without M=...) must 1673# be used. 1674# 1675# The following are the only valid targets when building external 1676# modules. 1677# make M=dir clean Delete all automatically generated files 1678# make M=dir modules Make all modules in specified dir 1679# make M=dir Same as 'make M=dir modules' 1680# make M=dir modules_install 1681# Install the modules built in the module directory 1682# Assumes install directory is already created 1683 1684# We are always building modules 1685KBUILD_MODULES := 1 1686 1687build-dirs := $(KBUILD_EXTMOD) 1688PHONY += modules 1689modules: descend 1690 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1691 1692PHONY += modules_install 1693modules_install: _emodinst_ _emodinst_post 1694 1695install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1696PHONY += _emodinst_ 1697_emodinst_: 1698 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1699 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1700 1701PHONY += _emodinst_post 1702_emodinst_post: _emodinst_ 1703 $(call cmd,depmod) 1704 1705clean-dirs := $(KBUILD_EXTMOD) 1706clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1707 1708PHONY += help 1709help: 1710 @echo ' Building external modules.' 1711 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1712 @echo '' 1713 @echo ' modules - default target, build the module(s)' 1714 @echo ' modules_install - install the module' 1715 @echo ' clean - remove generated files in module directory only' 1716 @echo '' 1717 1718PHONY += prepare 1719endif # KBUILD_EXTMOD 1720 1721# Single targets 1722# --------------------------------------------------------------------------- 1723# To build individual files in subdirectories, you can do like this: 1724# 1725# make foo/bar/baz.s 1726# 1727# The supported suffixes for single-target are listed in 'single-targets' 1728# 1729# To build only under specific subdirectories, you can do like this: 1730# 1731# make foo/bar/baz/ 1732 1733ifdef single-build 1734 1735# .ko is special because modpost is needed 1736single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1737single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1738 1739$(single-ko): single_modpost 1740 @: 1741$(single-no-ko): descend 1742 @: 1743 1744ifeq ($(KBUILD_EXTMOD),) 1745# For the single build of in-tree modules, use a temporary file to avoid 1746# the situation of modules_install installing an invalid modules.order. 1747MODORDER := .modules.tmp 1748endif 1749 1750PHONY += single_modpost 1751single_modpost: $(single-no-ko) 1752 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1753 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1754 1755KBUILD_MODULES := 1 1756 1757export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1758 1759# trim unrelated directories 1760build-dirs := $(foreach d, $(build-dirs), \ 1761 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1762 1763endif 1764 1765ifndef CONFIG_MODULES 1766KBUILD_MODULES := 1767endif 1768 1769# Handle descending into subdirectories listed in $(build-dirs) 1770# Preset locale variables to speed up the build process. Limit locale 1771# tweaks to this spot to avoid wrong language settings when running 1772# make menuconfig etc. 1773# Error messages still appears in the original language 1774PHONY += descend $(build-dirs) 1775descend: $(build-dirs) 1776$(build-dirs): prepare 1777 $(Q)$(MAKE) $(build)=$@ \ 1778 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \ 1779 need-builtin=1 need-modorder=1 1780 1781clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1782PHONY += $(clean-dirs) clean 1783$(clean-dirs): 1784 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1785 1786clean: $(clean-dirs) 1787 $(call cmd,rmfiles) 1788 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1789 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1790 -o -name '*.ko.*' \ 1791 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1792 -o -name '*.dwo' -o -name '*.lst' \ 1793 -o -name '*.su' -o -name '*.mod' \ 1794 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1795 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1796 -o -name '*.asn1.[ch]' \ 1797 -o -name '*.symtypes' -o -name 'modules.order' \ 1798 -o -name '.tmp_*.o.*' \ 1799 -o -name '*.c.[012]*.*' \ 1800 -o -name '*.ll' \ 1801 -o -name '*.gcno' \) -type f -print | xargs rm -f 1802 1803# Generate tags for editors 1804# --------------------------------------------------------------------------- 1805quiet_cmd_tags = GEN $@ 1806 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1807 1808tags TAGS cscope gtags: FORCE 1809 $(call cmd,tags) 1810 1811# Script to generate missing namespace dependencies 1812# --------------------------------------------------------------------------- 1813 1814PHONY += nsdeps 1815nsdeps: export KBUILD_NSDEPS=1 1816nsdeps: modules 1817 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1818 1819# Scripts to check various things for consistency 1820# --------------------------------------------------------------------------- 1821 1822PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1823 1824includecheck: 1825 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1826 -name '*.[hcS]' -type f -print | sort \ 1827 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1828 1829versioncheck: 1830 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1831 -name '*.[hcS]' -type f -print | sort \ 1832 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1833 1834coccicheck: 1835 $(Q)$(BASH) $(srctree)/scripts/$@ 1836 1837namespacecheck: 1838 $(PERL) $(srctree)/scripts/namespace.pl 1839 1840export_report: 1841 $(PERL) $(srctree)/scripts/export_report.pl 1842 1843PHONY += checkstack kernelrelease kernelversion image_name 1844 1845# UML needs a little special treatment here. It wants to use the host 1846# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1847# else wants $(ARCH), including people doing cross-builds, which means 1848# that $(SUBARCH) doesn't work here. 1849ifeq ($(ARCH), um) 1850CHECKSTACK_ARCH := $(SUBARCH) 1851else 1852CHECKSTACK_ARCH := $(ARCH) 1853endif 1854checkstack: 1855 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1856 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1857 1858kernelrelease: 1859 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1860 1861kernelversion: 1862 @echo $(KERNELVERSION) 1863 1864image_name: 1865 @echo $(KBUILD_IMAGE) 1866 1867# Clear a bunch of variables before executing the submake 1868 1869ifeq ($(quiet),silent_) 1870tools_silent=s 1871endif 1872 1873tools/: FORCE 1874 $(Q)mkdir -p $(objtree)/tools 1875 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1876 1877tools/%: FORCE 1878 $(Q)mkdir -p $(objtree)/tools 1879 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1880 1881quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1882 cmd_rmfiles = rm -rf $(rm-files) 1883 1884# Run depmod only if we have System.map and depmod is executable 1885quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1886 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1887 $(KERNELRELEASE) 1888 1889# read saved command lines for existing targets 1890existing-targets := $(wildcard $(sort $(targets))) 1891 1892-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1893 1894endif # config-build 1895endif # mixed-build 1896endif # need-sub-make 1897 1898PHONY += FORCE 1899FORCE: 1900 1901# Declare the contents of the PHONY variable as phony. We keep that 1902# information in a variable so we can use it in if_changed and friends. 1903.PHONY: $(PHONY) 1904