1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 6 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# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# We are using a recursive build, so we need to do a little thinking 19# to get the ordering right. 20# 21# Most importantly: sub-Makefiles should only ever modify files in 22# their own directory. If in some directory we have a dependency on 23# a file in another dir (which doesn't happen often, but it's often 24# unavoidable when linking the built-in.a targets which finally 25# turn into vmlinux), we will call a sub make in that other dir, and 26# after that we are sure that everything which is in that other dir 27# is now up to date. 28# 29# The only cases where we need to modify files which have global 30# effects are thus separated out and done before the recursive 31# descending is started. They are now explicitly listed as the 32# prepare rule. 33 34ifneq ($(sub_make_done),1) 35 36# Do not use make's built-in rules and variables 37# (this increases performance and avoids hard-to-debug behaviour) 38MAKEFLAGS += -rR 39 40# Avoid funny character set dependencies 41unexport LC_ALL 42LC_COLLATE=C 43LC_NUMERIC=C 44export LC_COLLATE LC_NUMERIC 45 46# Avoid interference with shell env settings 47unexport GREP_OPTIONS 48 49# Beautify output 50# --------------------------------------------------------------------------- 51# 52# Normally, we echo the whole command before executing it. By making 53# that echo $($(quiet)$(cmd)), we now have the possibility to set 54# $(quiet) to choose other forms of output instead, e.g. 55# 56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58# 59# If $(quiet) is empty, the whole command will be printed. 60# If it is set to "quiet_", only the short version will be printed. 61# If it is set to "silent_", nothing will be printed at all, since 62# the variable $(silent_cmd_cc_o_c) doesn't exist. 63# 64# A simple variant is to prefix commands with $(Q) - that's useful 65# for commands that shall be hidden in non-verbose mode. 66# 67# $(Q)ln $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 72# 73# To put more focus on warnings, be less verbose as default 74# Use 'make V=1' to see the full commands 75 76ifeq ("$(origin V)", "command line") 77 KBUILD_VERBOSE = $(V) 78endif 79ifndef KBUILD_VERBOSE 80 KBUILD_VERBOSE = 0 81endif 82 83ifeq ($(KBUILD_VERBOSE),1) 84 quiet = 85 Q = 86else 87 quiet=quiet_ 88 Q = @ 89endif 90 91# If the user is running make -s (silent mode), suppress echoing of 92# commands 93 94ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 95 quiet=silent_ 96endif 97 98export quiet Q KBUILD_VERBOSE 99 100# Kbuild will save output files in the current working directory. 101# This does not need to match to the root of the kernel source tree. 102# 103# For example, you can do this: 104# 105# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 106# 107# If you want to save output files in a different location, there are 108# two syntaxes to specify it. 109# 110# 1) O= 111# Use "make O=dir/to/store/output/files/" 112# 113# 2) Set KBUILD_OUTPUT 114# Set the environment variable KBUILD_OUTPUT to point to the output directory. 115# export KBUILD_OUTPUT=dir/to/store/output/files/; make 116# 117# The O= assignment takes precedence over the KBUILD_OUTPUT environment 118# variable. 119 120# Do we want to change the working directory? 121ifeq ("$(origin O)", "command line") 122 KBUILD_OUTPUT := $(O) 123endif 124 125ifneq ($(KBUILD_OUTPUT),) 126# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 127# expand a shell special character '~'. We use a somewhat tedious way here. 128abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 129$(if $(abs_objtree),, \ 130 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 131 132# $(realpath ...) resolves symlinks 133abs_objtree := $(realpath $(abs_objtree)) 134else 135abs_objtree := $(CURDIR) 136endif # ifneq ($(KBUILD_OUTPUT),) 137 138ifeq ($(abs_objtree),$(CURDIR)) 139# Suppress "Entering directory ..." unless we are changing the work directory. 140MAKEFLAGS += --no-print-directory 141else 142need-sub-make := 1 143endif 144 145abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 146 147ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 148$(error source directory cannot contain spaces or colons) 149endif 150 151ifneq ($(abs_srctree),$(abs_objtree)) 152# Look for make include files relative to root of kernel src 153# 154# This does not become effective immediately because MAKEFLAGS is re-parsed 155# once after the Makefile is read. We need to invoke sub-make. 156MAKEFLAGS += --include-dir=$(abs_srctree) 157need-sub-make := 1 158endif 159 160ifneq ($(filter 3.%,$(MAKE_VERSION)),) 161# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 162# We need to invoke sub-make to avoid implicit rules in the top Makefile. 163need-sub-make := 1 164# Cancel implicit rules for this Makefile. 165$(lastword $(MAKEFILE_LIST)): ; 166endif 167 168export abs_srctree abs_objtree 169export sub_make_done := 1 170 171ifeq ($(need-sub-make),1) 172 173PHONY += $(MAKECMDGOALS) sub-make 174 175$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make 176 @: 177 178# Invoke a second make in the output directory, passing relevant variables 179sub-make: 180 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 181 182endif # need-sub-make 183endif # sub_make_done 184 185# We process the rest of the Makefile if this is the final invocation of make 186ifeq ($(need-sub-make),) 187 188# Do not print "Entering directory ...", 189# but we want to display it when entering to the output directory 190# so that IDEs/editors are able to understand relative filenames. 191MAKEFLAGS += --no-print-directory 192 193# Call a source code checker (by default, "sparse") as part of the 194# C compilation. 195# 196# Use 'make C=1' to enable checking of only re-compiled files. 197# Use 'make C=2' to enable checking of *all* source files, regardless 198# of whether they are re-compiled or not. 199# 200# See the file "Documentation/dev-tools/sparse.rst" for more details, 201# including where to get the "sparse" utility. 202 203ifeq ("$(origin C)", "command line") 204 KBUILD_CHECKSRC = $(C) 205endif 206ifndef KBUILD_CHECKSRC 207 KBUILD_CHECKSRC = 0 208endif 209 210# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 211# directory of external module to build. Setting M= takes precedence. 212ifeq ("$(origin M)", "command line") 213 KBUILD_EXTMOD := $(M) 214endif 215 216export KBUILD_CHECKSRC KBUILD_EXTMOD 217 218extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 219 220ifeq ($(abs_srctree),$(abs_objtree)) 221 # building in the source tree 222 srctree := . 223 building_out_of_srctree := 224else 225 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 226 # building in a subdirectory of the source tree 227 srctree := .. 228 else 229 srctree := $(abs_srctree) 230 endif 231 building_out_of_srctree := 1 232endif 233 234ifneq ($(KBUILD_ABS_SRCTREE),) 235srctree := $(abs_srctree) 236endif 237 238objtree := . 239VPATH := $(srctree) 240 241export building_out_of_srctree srctree objtree VPATH 242 243# To make sure we do not include .config for any of the *config targets 244# catch them early, and hand them over to scripts/kconfig/Makefile 245# It is allowed to specify more targets when calling make, including 246# mixing *config targets and build targets. 247# For example 'make oldconfig all'. 248# Detect when mixed targets is specified, and make a second invocation 249# of make so .config is not included in this case either (for *config). 250 251version_h := include/generated/uapi/linux/version.h 252old_version_h := include/linux/version.h 253 254clean-targets := %clean mrproper cleandocs 255no-dot-config-targets := $(clean-targets) \ 256 cscope gtags TAGS tags help% %docs check% coccicheck \ 257 $(version_h) headers headers_% archheaders archscripts \ 258 %asm-generic kernelversion %src-pkg dt_binding_check \ 259 outputmakefile 260no-sync-config-targets := $(no-dot-config-targets) install %install \ 261 kernelrelease 262single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 263 264config-build := 265mixed-build := 266need-config := 1 267may-sync-config := 1 268single-build := 269 270ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 271 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 272 need-config := 273 endif 274endif 275 276ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 277 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 278 may-sync-config := 279 endif 280endif 281 282ifneq ($(KBUILD_EXTMOD),) 283 may-sync-config := 284endif 285 286ifeq ($(KBUILD_EXTMOD),) 287 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 288 config-build := 1 289 ifneq ($(words $(MAKECMDGOALS)),1) 290 mixed-build := 1 291 endif 292 endif 293endif 294 295# We cannot build single targets and the others at the same time 296ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 297 single-build := 1 298 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 299 mixed-build := 1 300 endif 301endif 302 303# For "make -j clean all", "make -j mrproper defconfig all", etc. 304ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 305 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# install and modules_install need also be processed one by one 311ifneq ($(filter install,$(MAKECMDGOALS)),) 312 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317ifdef mixed-build 318# =========================================================================== 319# We're called with mixed targets (*config and build targets). 320# Handle them one by one. 321 322PHONY += $(MAKECMDGOALS) __build_one_by_one 323 324$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 325 @: 326 327__build_one_by_one: 328 $(Q)set -e; \ 329 for i in $(MAKECMDGOALS); do \ 330 $(MAKE) -f $(srctree)/Makefile $$i; \ 331 done 332 333else # !mixed-build 334 335include scripts/Kbuild.include 336 337# Read KERNELRELEASE from include/config/kernel.release (if it exists) 338KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 339KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 340export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 341 342include scripts/subarch.include 343 344# Cross compiling and selecting different set of gcc/bin-utils 345# --------------------------------------------------------------------------- 346# 347# When performing cross compilation for other architectures ARCH shall be set 348# to the target architecture. (See arch/* for the possibilities). 349# ARCH can be set during invocation of make: 350# make ARCH=ia64 351# Another way is to have ARCH set in the environment. 352# The default ARCH is the host where make is executed. 353 354# CROSS_COMPILE specify the prefix used for all executables used 355# during compilation. Only gcc and related bin-utils executables 356# are prefixed with $(CROSS_COMPILE). 357# CROSS_COMPILE can be set on the command line 358# make CROSS_COMPILE=ia64-linux- 359# Alternatively CROSS_COMPILE can be set in the environment. 360# Default value for CROSS_COMPILE is not to prefix executables 361# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 362ARCH ?= $(SUBARCH) 363 364# Architecture as present in compile.h 365UTS_MACHINE := $(ARCH) 366SRCARCH := $(ARCH) 367 368# Additional ARCH settings for x86 369ifeq ($(ARCH),i386) 370 SRCARCH := x86 371endif 372ifeq ($(ARCH),x86_64) 373 SRCARCH := x86 374endif 375 376# Additional ARCH settings for sparc 377ifeq ($(ARCH),sparc32) 378 SRCARCH := sparc 379endif 380ifeq ($(ARCH),sparc64) 381 SRCARCH := sparc 382endif 383 384# Additional ARCH settings for sh 385ifeq ($(ARCH),sh64) 386 SRCARCH := sh 387endif 388 389KCONFIG_CONFIG ?= .config 390export KCONFIG_CONFIG 391 392# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 393export KBUILD_DEFCONFIG := defconfig 394 395# SHELL used by kbuild 396CONFIG_SHELL := sh 397 398HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 399HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 400HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 401 402HOSTCC = gcc 403HOSTCXX = g++ 404KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 405 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 406 $(HOSTCFLAGS) 407KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 408KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 409KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 410 411# Make variables (CC, etc...) 412LD = $(CROSS_COMPILE)ld 413CC = $(CROSS_COMPILE)gcc 414CPP = $(CC) -E 415AR = $(CROSS_COMPILE)ar 416NM = $(CROSS_COMPILE)nm 417STRIP = $(CROSS_COMPILE)strip 418OBJCOPY = $(CROSS_COMPILE)objcopy 419OBJDUMP = $(CROSS_COMPILE)objdump 420OBJSIZE = $(CROSS_COMPILE)size 421READELF = $(CROSS_COMPILE)readelf 422PAHOLE = pahole 423LEX = flex 424YACC = bison 425AWK = awk 426INSTALLKERNEL := installkernel 427DEPMOD = /sbin/depmod 428PERL = perl 429PYTHON = python 430PYTHON3 = python3 431CHECK = sparse 432BASH = bash 433 434CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 435 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 436NOSTDINC_FLAGS := 437CFLAGS_MODULE = 438AFLAGS_MODULE = 439LDFLAGS_MODULE = 440CFLAGS_KERNEL = 441AFLAGS_KERNEL = 442LDFLAGS_vmlinux = 443 444# Use USERINCLUDE when you must reference the UAPI directories only. 445USERINCLUDE := \ 446 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 447 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 448 -I$(srctree)/include/uapi \ 449 -I$(objtree)/include/generated/uapi \ 450 -include $(srctree)/include/linux/kconfig.h 451 452# Use LINUXINCLUDE when you must reference the include/ directory. 453# Needed to be compatible with the O= option 454LINUXINCLUDE := \ 455 -I$(srctree)/arch/$(SRCARCH)/include \ 456 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 457 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 458 -I$(objtree)/include \ 459 $(USERINCLUDE) 460 461KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 462KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 463 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 464 -Werror=implicit-function-declaration -Werror=implicit-int \ 465 -Wno-format-security \ 466 -std=gnu89 467KBUILD_CPPFLAGS := -D__KERNEL__ 468KBUILD_AFLAGS_KERNEL := 469KBUILD_CFLAGS_KERNEL := 470KBUILD_AFLAGS_MODULE := -DMODULE 471KBUILD_CFLAGS_MODULE := -DMODULE 472KBUILD_LDFLAGS_MODULE := 473export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 474KBUILD_LDFLAGS := 475GCC_PLUGINS_CFLAGS := 476CLANG_FLAGS := 477 478export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 479export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL 480export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 481export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 482 483export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 484export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 485export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 486export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 487export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 488export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 489 490# Files to ignore in find ... statements 491 492export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 493 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 494 -prune -o 495export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 496 --exclude CVS --exclude .pc --exclude .hg --exclude .git 497 498# =========================================================================== 499# Rules shared between *config targets and build targets 500 501# Basic helpers built in scripts/basic/ 502PHONY += scripts_basic 503scripts_basic: 504 $(Q)$(MAKE) $(build)=scripts/basic 505 $(Q)rm -f .tmp_quiet_recordmcount 506 507PHONY += outputmakefile 508# Before starting out-of-tree build, make sure the source tree is clean. 509# outputmakefile generates a Makefile in the output directory, if using a 510# separate output directory. This allows convenient use of make in the 511# output directory. 512# At the same time when output Makefile generated, generate .gitignore to 513# ignore whole output directory 514outputmakefile: 515ifdef building_out_of_srctree 516 $(Q)if [ -f $(srctree)/.config -o \ 517 -d $(srctree)/include/config -o \ 518 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 519 echo >&2 "***"; \ 520 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 521 echo >&2 "*** in $(abs_srctree)";\ 522 echo >&2 "***"; \ 523 false; \ 524 fi 525 $(Q)ln -fsn $(srctree) source 526 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 527 $(Q)test -e .gitignore || \ 528 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 529endif 530 531ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 532ifneq ($(CROSS_COMPILE),) 533CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 534GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 535CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 536GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 537endif 538ifneq ($(GCC_TOOLCHAIN),) 539CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 540endif 541ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),) 542CLANG_FLAGS += -no-integrated-as 543endif 544CLANG_FLAGS += -Werror=unknown-warning-option 545KBUILD_CFLAGS += $(CLANG_FLAGS) 546KBUILD_AFLAGS += $(CLANG_FLAGS) 547export CLANG_FLAGS 548endif 549 550# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 551# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 552# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 553# and from include/config/auto.conf.cmd to detect the compiler upgrade. 554CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 555 556ifdef config-build 557# =========================================================================== 558# *config targets only - make sure prerequisites are updated, and descend 559# in scripts/kconfig to make the *config target 560 561# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 562# KBUILD_DEFCONFIG may point out an alternative default configuration 563# used for 'make defconfig' 564include arch/$(SRCARCH)/Makefile 565export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 566 567config: outputmakefile scripts_basic FORCE 568 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 569 570%config: outputmakefile scripts_basic FORCE 571 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 572 573else #!config-build 574# =========================================================================== 575# Build targets only - this includes vmlinux, arch specific targets, clean 576# targets and others. In general all targets except *config targets. 577 578# If building an external module we do not care about the all: rule 579# but instead _all depend on modules 580PHONY += all 581ifeq ($(KBUILD_EXTMOD),) 582_all: all 583else 584_all: modules 585endif 586 587# Decide whether to build built-in, modular, or both. 588# Normally, just do built-in. 589 590KBUILD_MODULES := 591KBUILD_BUILTIN := 1 592 593# If we have only "make modules", don't compile built-in objects. 594# When we're building modules with modversions, we need to consider 595# the built-in objects during the descend as well, in order to 596# make sure the checksums are up to date before we record them. 597 598ifeq ($(MAKECMDGOALS),modules) 599 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 600endif 601 602# If we have "make <whatever> modules", compile modules 603# in addition to whatever we do anyway. 604# Just "make" or "make all" shall build modules as well 605 606ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),) 607 KBUILD_MODULES := 1 608endif 609 610ifeq ($(MAKECMDGOALS),) 611 KBUILD_MODULES := 1 612endif 613 614export KBUILD_MODULES KBUILD_BUILTIN 615 616ifdef need-config 617include include/config/auto.conf 618endif 619 620ifeq ($(KBUILD_EXTMOD),) 621# Objects we will link into vmlinux / subdirs we need to visit 622init-y := init/ 623drivers-y := drivers/ sound/ 624drivers-$(CONFIG_SAMPLES) += samples/ 625net-y := net/ 626libs-y := lib/ 627core-y := usr/ 628virt-y := virt/ 629endif # KBUILD_EXTMOD 630 631# The all: target is the default when no target is given on the 632# command line. 633# This allow a user to issue only 'make' to build a kernel including modules 634# Defaults to vmlinux, but the arch makefile usually adds further targets 635all: vmlinux 636 637CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 638 $(call cc-option,-fno-tree-loop-im) \ 639 $(call cc-disable-warning,maybe-uninitialized,) 640export CFLAGS_GCOV 641 642# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 643ifdef CONFIG_FUNCTION_TRACER 644 CC_FLAGS_FTRACE := -pg 645endif 646 647RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 648RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 649RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 650RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 651RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 652RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 653export RETPOLINE_CFLAGS 654export RETPOLINE_VDSO_CFLAGS 655 656include arch/$(SRCARCH)/Makefile 657 658ifdef need-config 659ifdef may-sync-config 660# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 661# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 662# because some architectures define CROSS_COMPILE there. 663include include/config/auto.conf.cmd 664 665$(KCONFIG_CONFIG): 666 @echo >&2 '***' 667 @echo >&2 '*** Configuration file "$@" not found!' 668 @echo >&2 '***' 669 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 670 @echo >&2 '*** "make menuconfig" or "make xconfig").' 671 @echo >&2 '***' 672 @/bin/false 673 674# The actual configuration files used during the build are stored in 675# include/generated/ and include/config/. Update them if .config is newer than 676# include/config/auto.conf (which mirrors .config). 677# 678# This exploits the 'multi-target pattern rule' trick. 679# The syncconfig should be executed only once to make all the targets. 680# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 681%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG) 682 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 683else # !may-sync-config 684# External modules and some install targets need include/generated/autoconf.h 685# and include/config/auto.conf but do not care if they are up-to-date. 686# Use auto.conf to trigger the test 687PHONY += include/config/auto.conf 688 689include/config/auto.conf: 690 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 691 echo >&2; \ 692 echo >&2 " ERROR: Kernel configuration is invalid."; \ 693 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 694 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 695 echo >&2 ; \ 696 /bin/false) 697 698endif # may-sync-config 699endif # need-config 700 701KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 702KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 703KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 704KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 705KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 706 707ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 708KBUILD_CFLAGS += -O2 709else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 710KBUILD_CFLAGS += -O3 711else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 712KBUILD_CFLAGS += -Os 713endif 714 715ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 716KBUILD_CFLAGS += -Wno-maybe-uninitialized 717endif 718 719# Tell gcc to never replace conditional load with a non-conditional one 720KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 721KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 722 723include scripts/Makefile.kcov 724include scripts/Makefile.gcc-plugins 725 726ifdef CONFIG_READABLE_ASM 727# Disable optimizations that make assembler listings hard to read. 728# reorder blocks reorders the control in the function 729# ipa clone creates specialized cloned functions 730# partial inlining inlines only parts of functions 731KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 732 $(call cc-option,-fno-ipa-cp-clone,) \ 733 $(call cc-option,-fno-partial-inlining) 734endif 735 736ifneq ($(CONFIG_FRAME_WARN),0) 737KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 738endif 739 740stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 741stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 742stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 743 744KBUILD_CFLAGS += $(stackp-flags-y) 745 746ifdef CONFIG_CC_IS_CLANG 747KBUILD_CPPFLAGS += -Qunused-arguments 748KBUILD_CFLAGS += -Wno-format-invalid-specifier 749KBUILD_CFLAGS += -Wno-gnu 750# Quiet clang warning: comparison of unsigned expression < 0 is always false 751KBUILD_CFLAGS += -Wno-tautological-compare 752# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 753# source of a reference will be _MergedGlobals and not on of the whitelisted names. 754# See modpost pattern 2 755KBUILD_CFLAGS += -mno-global-merge 756else 757 758# These warnings generated too much noise in a regular build. 759# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 760KBUILD_CFLAGS += -Wno-unused-but-set-variable 761 762# Warn about unmarked fall-throughs in switch statement. 763# Disabled for clang while comment to attribute conversion happens and 764# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 765KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 766endif 767 768KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 769ifdef CONFIG_FRAME_POINTER 770KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 771else 772# Some targets (ARM with Thumb2, for example), can't be built with frame 773# pointers. For those, we don't have FUNCTION_TRACER automatically 774# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 775# incompatible with -fomit-frame-pointer with current GCC, so we don't use 776# -fomit-frame-pointer with FUNCTION_TRACER. 777ifndef CONFIG_FUNCTION_TRACER 778KBUILD_CFLAGS += -fomit-frame-pointer 779endif 780endif 781 782# Initialize all stack variables with a pattern, if desired. 783ifdef CONFIG_INIT_STACK_ALL 784KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 785endif 786 787DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 788 789ifdef CONFIG_DEBUG_INFO 790ifdef CONFIG_DEBUG_INFO_SPLIT 791DEBUG_CFLAGS += -gsplit-dwarf 792else 793DEBUG_CFLAGS += -g 794endif 795KBUILD_AFLAGS += -Wa,-gdwarf-2 796endif 797ifdef CONFIG_DEBUG_INFO_DWARF4 798DEBUG_CFLAGS += -gdwarf-4 799endif 800 801ifdef CONFIG_DEBUG_INFO_REDUCED 802DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 803 $(call cc-option,-fno-var-tracking) 804endif 805 806KBUILD_CFLAGS += $(DEBUG_CFLAGS) 807export DEBUG_CFLAGS 808 809ifdef CONFIG_FUNCTION_TRACER 810ifdef CONFIG_FTRACE_MCOUNT_RECORD 811 # gcc 5 supports generating the mcount tables directly 812 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 813 CC_FLAGS_FTRACE += -mrecord-mcount 814 export CC_USING_RECORD_MCOUNT := 1 815 endif 816 ifdef CONFIG_HAVE_NOP_MCOUNT 817 ifeq ($(call cc-option-yn, -mnop-mcount),y) 818 CC_FLAGS_FTRACE += -mnop-mcount 819 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 820 endif 821 endif 822endif 823ifdef CONFIG_HAVE_FENTRY 824 ifeq ($(call cc-option-yn, -mfentry),y) 825 CC_FLAGS_FTRACE += -mfentry 826 CC_FLAGS_USING += -DCC_USING_FENTRY 827 endif 828endif 829export CC_FLAGS_FTRACE 830KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 831KBUILD_AFLAGS += $(CC_FLAGS_USING) 832ifdef CONFIG_DYNAMIC_FTRACE 833 ifdef CONFIG_HAVE_C_RECORDMCOUNT 834 BUILD_C_RECORDMCOUNT := y 835 export BUILD_C_RECORDMCOUNT 836 endif 837endif 838endif 839 840# We trigger additional mismatches with less inlining 841ifdef CONFIG_DEBUG_SECTION_MISMATCH 842KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 843endif 844 845ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 846KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 847LDFLAGS_vmlinux += --gc-sections 848endif 849 850ifdef CONFIG_LIVEPATCH 851KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 852endif 853 854# arch Makefile may override CC so keep this after arch Makefile is included 855NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 856 857# warn about C99 declaration after statement 858KBUILD_CFLAGS += -Wdeclaration-after-statement 859 860# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 861KBUILD_CFLAGS += -Wvla 862 863# disable pointer signed / unsigned warnings in gcc 4.0 864KBUILD_CFLAGS += -Wno-pointer-sign 865 866# disable stringop warnings in gcc 8+ 867KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 868 869# disable invalid "can't wrap" optimizations for signed / pointers 870KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 871 872# clang sets -fmerge-all-constants by default as optimization, but this 873# is non-conforming behavior for C and in fact breaks the kernel, so we 874# need to disable it here generally. 875KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 876 877# for gcc -fno-merge-all-constants disables everything, but it is fine 878# to have actual conforming behavior enabled. 879KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 880 881# Make sure -fstack-check isn't enabled (like gentoo apparently did) 882KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 883 884# conserve stack if available 885KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 886 887# Prohibit date/time macros, which would make the build non-deterministic 888KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 889 890# enforce correct pointer usage 891KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 892 893# Require designated initializers for all marked structures 894KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 895 896# change __FILE__ to the relative path from the srctree 897KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 898 899# ensure -fcf-protection is disabled when using retpoline as it is 900# incompatible with -mindirect-branch=thunk-extern 901ifdef CONFIG_RETPOLINE 902KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 903endif 904 905include scripts/Makefile.kasan 906include scripts/Makefile.extrawarn 907include scripts/Makefile.ubsan 908 909# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 910KBUILD_CPPFLAGS += $(KCPPFLAGS) 911KBUILD_AFLAGS += $(KAFLAGS) 912KBUILD_CFLAGS += $(KCFLAGS) 913 914KBUILD_LDFLAGS_MODULE += --build-id 915LDFLAGS_vmlinux += --build-id 916 917ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 918LDFLAGS_vmlinux += $(call ld-option, -X,) 919endif 920 921ifeq ($(CONFIG_RELR),y) 922LDFLAGS_vmlinux += --pack-dyn-relocs=relr 923endif 924 925# make the checker run with the right architecture 926CHECKFLAGS += --arch=$(ARCH) 927 928# insure the checker run with the right endianness 929CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 930 931# the checker needs the correct machine size 932CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 933 934# Default kernel image to build when no specific target is given. 935# KBUILD_IMAGE may be overruled on the command line or 936# set in the environment 937# Also any assignments in arch/$(ARCH)/Makefile take precedence over 938# this default value 939export KBUILD_IMAGE ?= vmlinux 940 941# 942# INSTALL_PATH specifies where to place the updated kernel and system map 943# images. Default is /boot, but you can set it to other values 944export INSTALL_PATH ?= /boot 945 946# 947# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 948# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 949# an argument if needed. Otherwise it defaults to the kernel install path 950# 951export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 952 953# 954# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 955# relocations required by build roots. This is not defined in the 956# makefile but the argument can be passed to make if needed. 957# 958 959MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 960export MODLIB 961 962# 963# INSTALL_MOD_STRIP, if defined, will cause modules to be 964# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 965# the default option --strip-debug will be used. Otherwise, 966# INSTALL_MOD_STRIP value will be used as the options to the strip command. 967 968ifdef INSTALL_MOD_STRIP 969ifeq ($(INSTALL_MOD_STRIP),1) 970mod_strip_cmd = $(STRIP) --strip-debug 971else 972mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 973endif # INSTALL_MOD_STRIP=1 974else 975mod_strip_cmd = true 976endif # INSTALL_MOD_STRIP 977export mod_strip_cmd 978 979# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 980# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 981# or CONFIG_MODULE_COMPRESS_XZ. 982 983mod_compress_cmd = true 984ifdef CONFIG_MODULE_COMPRESS 985 ifdef CONFIG_MODULE_COMPRESS_GZIP 986 mod_compress_cmd = gzip -n -f 987 endif # CONFIG_MODULE_COMPRESS_GZIP 988 ifdef CONFIG_MODULE_COMPRESS_XZ 989 mod_compress_cmd = xz -f 990 endif # CONFIG_MODULE_COMPRESS_XZ 991endif # CONFIG_MODULE_COMPRESS 992export mod_compress_cmd 993 994ifdef CONFIG_MODULE_SIG_ALL 995$(eval $(call config_filename,MODULE_SIG_KEY)) 996 997mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 998else 999mod_sign_cmd = true 1000endif 1001export mod_sign_cmd 1002 1003HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1004 1005ifdef CONFIG_STACK_VALIDATION 1006 has_libelf := $(call try-run,\ 1007 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1008 ifeq ($(has_libelf),1) 1009 objtool_target := tools/objtool FORCE 1010 else 1011 SKIP_STACK_VALIDATION := 1 1012 export SKIP_STACK_VALIDATION 1013 endif 1014endif 1015 1016PHONY += prepare0 1017 1018export MODORDER := $(extmod-prefix)modules.order 1019export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1020 1021ifeq ($(KBUILD_EXTMOD),) 1022core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1023 1024vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1025 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1026 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1027 1028vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1029 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1030 $(drivers-) $(net-) $(libs-) $(virt-)))) 1031 1032build-dirs := $(vmlinux-dirs) 1033clean-dirs := $(vmlinux-alldirs) 1034 1035init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1036core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1037drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1038net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1039libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1040libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1041virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1042 1043# Externally visible symbols (used by link-vmlinux.sh) 1044export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1045 $(drivers-y) $(net-y) $(virt-y) 1046export KBUILD_VMLINUX_LIBS := $(libs-y1) 1047export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1048export LDFLAGS_vmlinux 1049# used by scripts/Makefile.package 1050export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1051 1052vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1053 1054# Recurse until adjust_autoksyms.sh is satisfied 1055PHONY += autoksyms_recursive 1056ifdef CONFIG_TRIM_UNUSED_KSYMS 1057autoksyms_recursive: descend modules.order 1058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1059 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1060endif 1061 1062# For the kernel to actually contain only the needed exported symbols, 1063# we have to build modules as well to determine what those symbols are. 1064# (this can be evaluated only once include/config/auto.conf has been included) 1065ifdef CONFIG_TRIM_UNUSED_KSYMS 1066 KBUILD_MODULES := 1 1067endif 1068 1069autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1070 1071quiet_cmd_autoksyms_h = GEN $@ 1072 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1073 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1074 1075$(autoksyms_h): 1076 $(call cmd,autoksyms_h) 1077 1078ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1079 1080# Final link of vmlinux with optional arch pass after final link 1081cmd_link-vmlinux = \ 1082 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1083 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1084 1085vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1086 +$(call if_changed,link-vmlinux) 1087 1088targets := vmlinux 1089 1090# The actual objects are generated when descending, 1091# make sure no implicit rule kicks in 1092$(sort $(vmlinux-deps)): descend ; 1093 1094filechk_kernel.release = \ 1095 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1096 1097# Store (new) KERNELRELEASE string in include/config/kernel.release 1098include/config/kernel.release: FORCE 1099 $(call filechk,kernel.release) 1100 1101# Additional helpers built in scripts/ 1102# Carefully list dependencies so we do not try to build scripts twice 1103# in parallel 1104PHONY += scripts 1105scripts: scripts_basic scripts_dtc 1106 $(Q)$(MAKE) $(build)=$(@) 1107 1108# Things we need to do before we recursively start building the kernel 1109# or the modules are listed in "prepare". 1110# A multi level approach is used. prepareN is processed before prepareN-1. 1111# archprepare is used in arch Makefiles and when processed asm symlink, 1112# version.h and scripts_basic is processed / created. 1113 1114PHONY += prepare archprepare 1115 1116archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1117 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1118 1119prepare0: archprepare 1120 $(Q)$(MAKE) $(build)=scripts/mod 1121 $(Q)$(MAKE) $(build)=. 1122 1123# All the preparing.. 1124prepare: prepare0 prepare-objtool 1125 1126# Support for using generic headers in asm-generic 1127asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1128 1129PHONY += asm-generic uapi-asm-generic 1130asm-generic: uapi-asm-generic 1131 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1132 generic=include/asm-generic 1133uapi-asm-generic: 1134 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1135 generic=include/uapi/asm-generic 1136 1137PHONY += prepare-objtool 1138prepare-objtool: $(objtool_target) 1139ifeq ($(SKIP_STACK_VALIDATION),1) 1140ifdef CONFIG_UNWINDER_ORC 1141 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1142 @false 1143else 1144 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1145endif 1146endif 1147 1148# Generate some files 1149# --------------------------------------------------------------------------- 1150 1151# KERNELRELEASE can change from a few different places, meaning version.h 1152# needs to be updated, so this check is forced on all builds 1153 1154uts_len := 64 1155define filechk_utsrelease.h 1156 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1157 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1158 exit 1; \ 1159 fi; \ 1160 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1161endef 1162 1163define filechk_version.h 1164 echo \#define LINUX_VERSION_CODE $(shell \ 1165 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1166 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1167endef 1168 1169$(version_h): FORCE 1170 $(call filechk,version.h) 1171 $(Q)rm -f $(old_version_h) 1172 1173include/generated/utsrelease.h: include/config/kernel.release FORCE 1174 $(call filechk,utsrelease.h) 1175 1176PHONY += headerdep 1177headerdep: 1178 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1179 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1180 1181# --------------------------------------------------------------------------- 1182# Kernel headers 1183 1184#Default location for installed headers 1185export INSTALL_HDR_PATH = $(objtree)/usr 1186 1187quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1188 cmd_headers_install = \ 1189 mkdir -p $(INSTALL_HDR_PATH); \ 1190 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1191 usr/include $(INSTALL_HDR_PATH) 1192 1193PHONY += headers_install 1194headers_install: headers 1195 $(call cmd,headers_install) 1196 1197PHONY += archheaders archscripts 1198 1199hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1200 1201PHONY += headers 1202headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1203 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1204 $(error Headers not exportable for the $(SRCARCH) architecture)) 1205 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1206 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1207 1208# Deprecated. It is no-op now. 1209PHONY += headers_check 1210headers_check: 1211 @: 1212 1213ifdef CONFIG_HEADERS_INSTALL 1214prepare: headers 1215endif 1216 1217PHONY += scripts_unifdef 1218scripts_unifdef: scripts_basic 1219 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1220 1221# --------------------------------------------------------------------------- 1222# Kernel selftest 1223 1224PHONY += kselftest 1225kselftest: 1226 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1227 1228kselftest-%: FORCE 1229 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1230 1231PHONY += kselftest-merge 1232kselftest-merge: 1233 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1234 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1235 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1236 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1237 1238# --------------------------------------------------------------------------- 1239# Devicetree files 1240 1241ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1242dtstree := arch/$(SRCARCH)/boot/dts 1243endif 1244 1245ifneq ($(dtstree),) 1246 1247%.dtb: include/config/kernel.release scripts_dtc 1248 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1249 1250PHONY += dtbs dtbs_install dtbs_check 1251dtbs: include/config/kernel.release scripts_dtc 1252 $(Q)$(MAKE) $(build)=$(dtstree) 1253 1254ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1255export CHECK_DTBS=y 1256dtbs: dt_binding_check 1257endif 1258 1259dtbs_check: dtbs 1260 1261dtbs_install: 1262 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1263 1264ifdef CONFIG_OF_EARLY_FLATTREE 1265all: dtbs 1266endif 1267 1268endif 1269 1270PHONY += scripts_dtc 1271scripts_dtc: scripts_basic 1272 $(Q)$(MAKE) $(build)=scripts/dtc 1273 1274ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1275export CHECK_DT_BINDING=y 1276endif 1277 1278PHONY += dt_binding_check 1279dt_binding_check: scripts_dtc 1280 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1281 1282# --------------------------------------------------------------------------- 1283# Modules 1284 1285ifdef CONFIG_MODULES 1286 1287# By default, build modules as well 1288 1289all: modules 1290 1291# Build modules 1292# 1293# A module can be listed more than once in obj-m resulting in 1294# duplicate lines in modules.order files. Those are removed 1295# using awk while concatenating to the final file. 1296 1297PHONY += modules 1298modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order 1299 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1300 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1301 1302modules.order: descend 1303 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1304 1305# Target to prepare building external modules 1306PHONY += modules_prepare 1307modules_prepare: prepare 1308 1309# Target to install modules 1310PHONY += modules_install 1311modules_install: _modinst_ _modinst_post 1312 1313PHONY += _modinst_ 1314_modinst_: 1315 @rm -rf $(MODLIB)/kernel 1316 @rm -f $(MODLIB)/source 1317 @mkdir -p $(MODLIB)/kernel 1318 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1319 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1320 rm -f $(MODLIB)/build ; \ 1321 ln -s $(CURDIR) $(MODLIB)/build ; \ 1322 fi 1323 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1324 @cp -f modules.builtin $(MODLIB)/ 1325 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1326 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1327 1328# This depmod is only for convenience to give the initial 1329# boot a modules.dep even before / is mounted read-write. However the 1330# boot script depmod is the master version. 1331PHONY += _modinst_post 1332_modinst_post: _modinst_ 1333 $(call cmd,depmod) 1334 1335ifeq ($(CONFIG_MODULE_SIG), y) 1336PHONY += modules_sign 1337modules_sign: 1338 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1339endif 1340 1341else # CONFIG_MODULES 1342 1343# Modules not configured 1344# --------------------------------------------------------------------------- 1345 1346PHONY += modules modules_install 1347modules modules_install: 1348 @echo >&2 1349 @echo >&2 "The present kernel configuration has modules disabled." 1350 @echo >&2 "Type 'make config' and enable loadable module support." 1351 @echo >&2 "Then build a kernel with module support enabled." 1352 @echo >&2 1353 @exit 1 1354 1355endif # CONFIG_MODULES 1356 1357### 1358# Cleaning is done on three levels. 1359# make clean Delete most generated files 1360# Leave enough to build external modules 1361# make mrproper Delete the current configuration, and all generated files 1362# make distclean Remove editor backup files, patch leftover files and the like 1363 1364# Directories & files removed with 'make clean' 1365CLEAN_DIRS += include/ksym 1366CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps 1367 1368# Directories & files removed with 'make mrproper' 1369MRPROPER_DIRS += include/config include/generated \ 1370 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1371 debian/ snap/ tar-install/ 1372MRPROPER_FILES += .config .config.old .version \ 1373 Module.symvers \ 1374 signing_key.pem signing_key.priv signing_key.x509 \ 1375 x509.genkey extra_certificates signing_key.x509.keyid \ 1376 signing_key.x509.signer vmlinux-gdb.py \ 1377 *.spec 1378 1379# Directories & files removed with 'make distclean' 1380DISTCLEAN_DIRS += 1381DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1382 1383# clean - Delete most, but leave enough to build external modules 1384# 1385clean: rm-dirs := $(CLEAN_DIRS) 1386clean: rm-files := $(CLEAN_FILES) 1387 1388PHONY += archclean vmlinuxclean 1389 1390vmlinuxclean: 1391 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1392 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1393 1394clean: archclean vmlinuxclean 1395 1396# mrproper - Delete all generated files, including .config 1397# 1398mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1399mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1400mrproper-dirs := $(addprefix _mrproper_,scripts) 1401 1402PHONY += $(mrproper-dirs) mrproper 1403$(mrproper-dirs): 1404 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1405 1406mrproper: clean $(mrproper-dirs) 1407 $(call cmd,rmdirs) 1408 $(call cmd,rmfiles) 1409 1410# distclean 1411# 1412distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1413distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1414 1415PHONY += distclean 1416 1417distclean: mrproper 1418 $(call cmd,rmdirs) 1419 $(call cmd,rmfiles) 1420 @find $(srctree) $(RCS_FIND_IGNORE) \ 1421 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1422 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1423 -o -name 'core' \) \ 1424 -type f -print | xargs rm -f 1425 1426 1427# Packaging of the kernel to various formats 1428# --------------------------------------------------------------------------- 1429 1430%src-pkg: FORCE 1431 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1432%pkg: include/config/kernel.release FORCE 1433 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1434 1435# Brief documentation of the typical targets used 1436# --------------------------------------------------------------------------- 1437 1438boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1439boards := $(sort $(notdir $(boards))) 1440board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1441board-dirs := $(sort $(notdir $(board-dirs:/=))) 1442 1443PHONY += help 1444help: 1445 @echo 'Cleaning targets:' 1446 @echo ' clean - Remove most generated files but keep the config and' 1447 @echo ' enough build support to build external modules' 1448 @echo ' mrproper - Remove all generated files + config + various backup files' 1449 @echo ' distclean - mrproper + remove editor backup and patch files' 1450 @echo '' 1451 @echo 'Configuration targets:' 1452 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1453 @echo '' 1454 @echo 'Other generic targets:' 1455 @echo ' all - Build all targets marked with [*]' 1456 @echo '* vmlinux - Build the bare kernel' 1457 @echo '* modules - Build all modules' 1458 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1459 @echo ' dir/ - Build all files in dir and below' 1460 @echo ' dir/file.[ois] - Build specified target only' 1461 @echo ' dir/file.ll - Build the LLVM assembly file' 1462 @echo ' (requires compiler support for LLVM assembly generation)' 1463 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1464 @echo ' (requires a recent binutils and recent build (System.map))' 1465 @echo ' dir/file.ko - Build module including final link' 1466 @echo ' modules_prepare - Set up for building external modules' 1467 @echo ' tags/TAGS - Generate tags file for editors' 1468 @echo ' cscope - Generate cscope index' 1469 @echo ' gtags - Generate GNU GLOBAL index' 1470 @echo ' kernelrelease - Output the release version string (use with make -s)' 1471 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1472 @echo ' image_name - Output the image name (use with make -s)' 1473 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1474 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1475 echo '' 1476 @echo 'Static analysers:' 1477 @echo ' checkstack - Generate a list of stack hogs' 1478 @echo ' namespacecheck - Name space analysis on compiled kernel' 1479 @echo ' versioncheck - Sanity check on version.h usage' 1480 @echo ' includecheck - Check for duplicate included header files' 1481 @echo ' export_report - List the usages of all exported symbols' 1482 @echo ' headerdep - Detect inclusion cycles in headers' 1483 @echo ' coccicheck - Check with Coccinelle' 1484 @echo '' 1485 @echo 'Tools:' 1486 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1487 @echo '' 1488 @echo 'Kernel selftest:' 1489 @echo ' kselftest - Build and run kernel selftest' 1490 @echo ' Build, install, and boot kernel before' 1491 @echo ' running kselftest on it' 1492 @echo ' Run as root for full coverage' 1493 @echo ' kselftest-all - Build kernel selftest' 1494 @echo ' kselftest-install - Build and install kernel selftest' 1495 @echo ' kselftest-clean - Remove all generated kselftest files' 1496 @echo ' kselftest-merge - Merge all the config dependencies of' 1497 @echo ' kselftest to existing .config.' 1498 @echo '' 1499 @$(if $(dtstree), \ 1500 echo 'Devicetree:'; \ 1501 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1502 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1503 echo ' dt_binding_check - Validate device tree binding documents'; \ 1504 echo ' dtbs_check - Validate device tree source files';\ 1505 echo '') 1506 1507 @echo 'Userspace tools targets:' 1508 @echo ' use "make tools/help"' 1509 @echo ' or "cd tools; make help"' 1510 @echo '' 1511 @echo 'Kernel packaging:' 1512 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1513 @echo '' 1514 @echo 'Documentation targets:' 1515 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1516 @echo '' 1517 @echo 'Architecture specific targets ($(SRCARCH)):' 1518 @$(if $(archhelp),$(archhelp),\ 1519 echo ' No architecture specific help defined for $(SRCARCH)') 1520 @echo '' 1521 @$(if $(boards), \ 1522 $(foreach b, $(boards), \ 1523 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1524 echo '') 1525 @$(if $(board-dirs), \ 1526 $(foreach b, $(board-dirs), \ 1527 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1528 printf " %-16s - Show all of the above\\n" help-boards; \ 1529 echo '') 1530 1531 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1532 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1533 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1534 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1535 @echo ' (sparse by default)' 1536 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1537 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1538 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1539 @echo ' 1: warnings which may be relevant and do not occur too often' 1540 @echo ' 2: warnings which occur quite often but may still be relevant' 1541 @echo ' 3: more obscure warnings, can most likely be ignored' 1542 @echo ' Multiple levels can be combined with W=12 or W=123' 1543 @echo '' 1544 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1545 @echo 'For further info see the ./README file' 1546 1547 1548help-board-dirs := $(addprefix help-,$(board-dirs)) 1549 1550help-boards: $(help-board-dirs) 1551 1552boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1553 1554$(help-board-dirs): help-%: 1555 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1556 @$(if $(boards-per-dir), \ 1557 $(foreach b, $(boards-per-dir), \ 1558 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1559 echo '') 1560 1561 1562# Documentation targets 1563# --------------------------------------------------------------------------- 1564DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1565 linkcheckdocs dochelp refcheckdocs 1566PHONY += $(DOC_TARGETS) 1567$(DOC_TARGETS): 1568 $(Q)$(MAKE) $(build)=Documentation $@ 1569 1570# Misc 1571# --------------------------------------------------------------------------- 1572 1573PHONY += scripts_gdb 1574scripts_gdb: prepare0 1575 $(Q)$(MAKE) $(build)=scripts/gdb 1576 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1577 1578ifdef CONFIG_GDB_SCRIPTS 1579all: scripts_gdb 1580endif 1581 1582else # KBUILD_EXTMOD 1583 1584### 1585# External module support. 1586# When building external modules the kernel used as basis is considered 1587# read-only, and no consistency checks are made and the make 1588# system is not used on the basis kernel. If updates are required 1589# in the basis kernel ordinary make commands (without M=...) must 1590# be used. 1591# 1592# The following are the only valid targets when building external 1593# modules. 1594# make M=dir clean Delete all automatically generated files 1595# make M=dir modules Make all modules in specified dir 1596# make M=dir Same as 'make M=dir modules' 1597# make M=dir modules_install 1598# Install the modules built in the module directory 1599# Assumes install directory is already created 1600 1601# We are always building modules 1602KBUILD_MODULES := 1 1603 1604PHONY += $(objtree)/Module.symvers 1605$(objtree)/Module.symvers: 1606 @test -e $(objtree)/Module.symvers || ( \ 1607 echo; \ 1608 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1609 echo " is missing; modules will have no dependencies and modversions."; \ 1610 echo ) 1611 1612build-dirs := $(KBUILD_EXTMOD) 1613PHONY += modules 1614modules: descend $(objtree)/Module.symvers 1615 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1616 1617PHONY += modules_install 1618modules_install: _emodinst_ _emodinst_post 1619 1620install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1621PHONY += _emodinst_ 1622_emodinst_: 1623 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1624 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1625 1626PHONY += _emodinst_post 1627_emodinst_post: _emodinst_ 1628 $(call cmd,depmod) 1629 1630clean-dirs := $(KBUILD_EXTMOD) 1631clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1632 1633PHONY += / 1634/: 1635 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.' 1636 1637PHONY += help 1638help: 1639 @echo ' Building external modules.' 1640 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1641 @echo '' 1642 @echo ' modules - default target, build the module(s)' 1643 @echo ' modules_install - install the module' 1644 @echo ' clean - remove generated files in module directory only' 1645 @echo '' 1646 1647PHONY += prepare 1648endif # KBUILD_EXTMOD 1649 1650# Single targets 1651# --------------------------------------------------------------------------- 1652# To build individual files in subdirectories, you can do like this: 1653# 1654# make foo/bar/baz.s 1655# 1656# The supported suffixes for single-target are listed in 'single-targets' 1657# 1658# To build only under specific subdirectories, you can do like this: 1659# 1660# make foo/bar/baz/ 1661 1662ifdef single-build 1663 1664# .ko is special because modpost is needed 1665single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1666single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1667 1668$(single-ko): single_modpost 1669 @: 1670$(single-no-ko): descend 1671 @: 1672 1673ifeq ($(KBUILD_EXTMOD),) 1674# For the single build of in-tree modules, use a temporary file to avoid 1675# the situation of modules_install installing an invalid modules.order. 1676MODORDER := .modules.tmp 1677endif 1678 1679PHONY += single_modpost 1680single_modpost: $(single-no-ko) 1681 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1682 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1683 1684KBUILD_MODULES := 1 1685 1686export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1687 1688# trim unrelated directories 1689build-dirs := $(foreach d, $(build-dirs), \ 1690 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1691 1692endif 1693 1694# Handle descending into subdirectories listed in $(build-dirs) 1695# Preset locale variables to speed up the build process. Limit locale 1696# tweaks to this spot to avoid wrong language settings when running 1697# make menuconfig etc. 1698# Error messages still appears in the original language 1699PHONY += descend $(build-dirs) 1700descend: $(build-dirs) 1701$(build-dirs): prepare 1702 $(Q)$(MAKE) $(build)=$@ \ 1703 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \ 1704 need-builtin=1 need-modorder=1 1705 1706clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1707PHONY += $(clean-dirs) clean 1708$(clean-dirs): 1709 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1710 1711clean: $(clean-dirs) 1712 $(call cmd,rmdirs) 1713 $(call cmd,rmfiles) 1714 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1715 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1716 -o -name '*.ko.*' \ 1717 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1718 -o -name '*.dwo' -o -name '*.lst' \ 1719 -o -name '*.su' -o -name '*.mod' \ 1720 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1721 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1722 -o -name '*.asn1.[ch]' \ 1723 -o -name '*.symtypes' -o -name 'modules.order' \ 1724 -o -name '.tmp_*.o.*' \ 1725 -o -name '*.c.[012]*.*' \ 1726 -o -name '*.ll' \ 1727 -o -name '*.gcno' \) -type f -print | xargs rm -f 1728 1729# Generate tags for editors 1730# --------------------------------------------------------------------------- 1731quiet_cmd_tags = GEN $@ 1732 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1733 1734tags TAGS cscope gtags: FORCE 1735 $(call cmd,tags) 1736 1737# Script to generate missing namespace dependencies 1738# --------------------------------------------------------------------------- 1739 1740PHONY += nsdeps 1741nsdeps: export KBUILD_NSDEPS=1 1742nsdeps: modules 1743 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1744 1745# Scripts to check various things for consistency 1746# --------------------------------------------------------------------------- 1747 1748PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1749 1750includecheck: 1751 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1752 -name '*.[hcS]' -type f -print | sort \ 1753 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1754 1755versioncheck: 1756 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1757 -name '*.[hcS]' -type f -print | sort \ 1758 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1759 1760coccicheck: 1761 $(Q)$(BASH) $(srctree)/scripts/$@ 1762 1763namespacecheck: 1764 $(PERL) $(srctree)/scripts/namespace.pl 1765 1766export_report: 1767 $(PERL) $(srctree)/scripts/export_report.pl 1768 1769PHONY += checkstack kernelrelease kernelversion image_name 1770 1771# UML needs a little special treatment here. It wants to use the host 1772# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1773# else wants $(ARCH), including people doing cross-builds, which means 1774# that $(SUBARCH) doesn't work here. 1775ifeq ($(ARCH), um) 1776CHECKSTACK_ARCH := $(SUBARCH) 1777else 1778CHECKSTACK_ARCH := $(ARCH) 1779endif 1780checkstack: 1781 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1782 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1783 1784kernelrelease: 1785 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1786 1787kernelversion: 1788 @echo $(KERNELVERSION) 1789 1790image_name: 1791 @echo $(KBUILD_IMAGE) 1792 1793# Clear a bunch of variables before executing the submake 1794 1795ifeq ($(quiet),silent_) 1796tools_silent=s 1797endif 1798 1799tools/: FORCE 1800 $(Q)mkdir -p $(objtree)/tools 1801 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1802 1803tools/%: FORCE 1804 $(Q)mkdir -p $(objtree)/tools 1805 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1806 1807# FIXME Should go into a make.lib or something 1808# =========================================================================== 1809 1810quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1811 cmd_rmdirs = rm -rf $(rm-dirs) 1812 1813quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1814 cmd_rmfiles = rm -f $(rm-files) 1815 1816# Run depmod only if we have System.map and depmod is executable 1817quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1818 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1819 $(KERNELRELEASE) 1820 1821# read saved command lines for existing targets 1822existing-targets := $(wildcard $(sort $(targets))) 1823 1824-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1825 1826endif # config-build 1827endif # mixed-build 1828endif # need-sub-make 1829 1830PHONY += FORCE 1831FORCE: 1832 1833# Declare the contents of the PHONY variable as phony. We keep that 1834# information in a variable so we can use it in if_changed and friends. 1835.PHONY: $(PHONY) 1836