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   1# SPDX-License-Identifier: GPL-2.0
   2VERSION = 4
   3PATCHLEVEL = 19
   4SUBLEVEL = 0
   5EXTRAVERSION =
   6NAME = "People's Front"
   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# o Do not use make's built-in rules and variables
  19#   (this increases performance and avoids hard-to-debug behaviour);
  20# o Look for make include files relative to root of kernel src
  21MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23# Avoid funny character set dependencies
  24unexport LC_ALL
  25LC_COLLATE=C
  26LC_NUMERIC=C
  27export LC_COLLATE LC_NUMERIC
  28
  29# Avoid interference with shell env settings
  30unexport GREP_OPTIONS
  31
  32# We are using a recursive build, so we need to do a little thinking
  33# to get the ordering right.
  34#
  35# Most importantly: sub-Makefiles should only ever modify files in
  36# their own directory. If in some directory we have a dependency on
  37# a file in another dir (which doesn't happen often, but it's often
  38# unavoidable when linking the built-in.a targets which finally
  39# turn into vmlinux), we will call a sub make in that other dir, and
  40# after that we are sure that everything which is in that other dir
  41# is now up to date.
  42#
  43# The only cases where we need to modify files which have global
  44# effects are thus separated out and done before the recursive
  45# descending is started. They are now explicitly listed as the
  46# prepare rule.
  47
  48# Beautify output
  49# ---------------------------------------------------------------------------
  50#
  51# Normally, we echo the whole command before executing it. By making
  52# that echo $($(quiet)$(cmd)), we now have the possibility to set
  53# $(quiet) to choose other forms of output instead, e.g.
  54#
  55#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57#
  58# If $(quiet) is empty, the whole command will be printed.
  59# If it is set to "quiet_", only the short version will be printed.
  60# If it is set to "silent_", nothing will be printed at all, since
  61# the variable $(silent_cmd_cc_o_c) doesn't exist.
  62#
  63# A simple variant is to prefix commands with $(Q) - that's useful
  64# for commands that shall be hidden in non-verbose mode.
  65#
  66#       $(Q)ln $@ :<
  67#
  68# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70#
  71# To put more focus on warnings, be less verbose as default
  72# Use 'make V=1' to see the full commands
  73
  74ifeq ("$(origin V)", "command line")
  75  KBUILD_VERBOSE = $(V)
  76endif
  77ifndef KBUILD_VERBOSE
  78  KBUILD_VERBOSE = 0
  79endif
  80
  81ifeq ($(KBUILD_VERBOSE),1)
  82  quiet =
  83  Q =
  84else
  85  quiet=quiet_
  86  Q = @
  87endif
  88
  89# If the user is running make -s (silent mode), suppress echoing of
  90# commands
  91
  92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93  quiet=silent_
  94  tools_silent=s
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# kbuild supports saving output files in a separate directory.
 100# To locate output files in a separate directory two syntaxes are supported.
 101# In both cases the working directory must be the root of the kernel src.
 102# 1) O=
 103# Use "make O=dir/to/store/output/files/"
 104#
 105# 2) Set KBUILD_OUTPUT
 106# Set the environment variable KBUILD_OUTPUT to point to the directory
 107# where the output files shall be placed.
 108# export KBUILD_OUTPUT=dir/to/store/output/files/
 109# make
 110#
 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112# variable.
 113
 114# KBUILD_SRC is not intended to be used by the regular user (for now),
 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116ifeq ($(KBUILD_SRC),)
 117
 118# OK, Make called in directory where kernel src resides
 119# Do we want to locate output files in a separate directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124# Cancel implicit rules on top Makefile
 125$(CURDIR)/Makefile Makefile: ;
 126
 127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128  $(error main directory cannot contain spaces nor colons)
 129endif
 130
 131ifneq ($(KBUILD_OUTPUT),)
 132# check that the output directory actually exists
 133saved-output := $(KBUILD_OUTPUT)
 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                && pwd)
 136$(if $(KBUILD_OUTPUT),, \
 137     $(error failed to create output directory "$(saved-output)"))
 138
 139PHONY += $(MAKECMDGOALS) sub-make
 140
 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142        @:
 143
 144# Invoke a second make in the output directory, passing relevant variables
 145sub-make:
 146        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149# Leave processing to above invocation of make
 150skip-makefile := 1
 151endif # ifneq ($(KBUILD_OUTPUT),)
 152endif # ifeq ($(KBUILD_SRC),)
 153
 154# We process the rest of the Makefile if this is the final invocation of make
 155ifeq ($(skip-makefile),)
 156
 157# Do not print "Entering directory ...",
 158# but we want to display it when entering to the output directory
 159# so that IDEs/editors are able to understand relative filenames.
 160MAKEFLAGS += --no-print-directory
 161
 162# Call a source code checker (by default, "sparse") as part of the
 163# C compilation.
 164#
 165# Use 'make C=1' to enable checking of only re-compiled files.
 166# Use 'make C=2' to enable checking of *all* source files, regardless
 167# of whether they are re-compiled or not.
 168#
 169# See the file "Documentation/dev-tools/sparse.rst" for more details,
 170# including where to get the "sparse" utility.
 171
 172ifeq ("$(origin C)", "command line")
 173  KBUILD_CHECKSRC = $(C)
 174endif
 175ifndef KBUILD_CHECKSRC
 176  KBUILD_CHECKSRC = 0
 177endif
 178
 179# Use make M=dir to specify directory of external module to build
 180# Old syntax make ... SUBDIRS=$PWD is still supported
 181# Setting the environment variable KBUILD_EXTMOD take precedence
 182ifdef SUBDIRS
 183  KBUILD_EXTMOD ?= $(SUBDIRS)
 184endif
 185
 186ifeq ("$(origin M)", "command line")
 187  KBUILD_EXTMOD := $(M)
 188endif
 189
 190ifeq ($(KBUILD_SRC),)
 191        # building in the source tree
 192        srctree := .
 193else
 194        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                # building in a subdirectory of the source tree
 196                srctree := ..
 197        else
 198                srctree := $(KBUILD_SRC)
 199        endif
 200endif
 201
 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204objtree         := .
 205src             := $(srctree)
 206obj             := $(objtree)
 207
 208VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210export srctree objtree VPATH
 211
 212# To make sure we do not include .config for any of the *config targets
 213# catch them early, and hand them over to scripts/kconfig/Makefile
 214# It is allowed to specify more targets when calling make, including
 215# mixing *config targets and build targets.
 216# For example 'make oldconfig all'.
 217# Detect when mixed targets is specified, and make a second invocation
 218# of make so .config is not included in this case either (for *config).
 219
 220version_h := include/generated/uapi/linux/version.h
 221old_version_h := include/linux/version.h
 222
 223clean-targets := %clean mrproper cleandocs
 224no-dot-config-targets := $(clean-targets) \
 225                         cscope gtags TAGS tags help% %docs check% coccicheck \
 226                         $(version_h) headers_% archheaders archscripts \
 227                         %asm-generic kernelversion %src-pkg
 228no-sync-config-targets := $(no-dot-config-targets) install %install \
 229                           kernelrelease
 230
 231config-targets  := 0
 232mixed-targets   := 0
 233dot-config      := 1
 234may-sync-config := 1
 235
 236ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 237        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 238                dot-config := 0
 239        endif
 240endif
 241
 242ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 243        ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 244                may-sync-config := 0
 245        endif
 246endif
 247
 248ifneq ($(KBUILD_EXTMOD),)
 249        may-sync-config := 0
 250endif
 251
 252ifeq ($(KBUILD_EXTMOD),)
 253        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 254                config-targets := 1
 255                ifneq ($(words $(MAKECMDGOALS)),1)
 256                        mixed-targets := 1
 257                endif
 258        endif
 259endif
 260
 261# For "make -j clean all", "make -j mrproper defconfig all", etc.
 262ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 263        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 264                mixed-targets := 1
 265        endif
 266endif
 267
 268# install and modules_install need also be processed one by one
 269ifneq ($(filter install,$(MAKECMDGOALS)),)
 270        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 271                mixed-targets := 1
 272        endif
 273endif
 274
 275ifeq ($(mixed-targets),1)
 276# ===========================================================================
 277# We're called with mixed targets (*config and build targets).
 278# Handle them one by one.
 279
 280PHONY += $(MAKECMDGOALS) __build_one_by_one
 281
 282$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 283        @:
 284
 285__build_one_by_one:
 286        $(Q)set -e; \
 287        for i in $(MAKECMDGOALS); do \
 288                $(MAKE) -f $(srctree)/Makefile $$i; \
 289        done
 290
 291else
 292
 293# We need some generic definitions (do not try to remake the file).
 294scripts/Kbuild.include: ;
 295include scripts/Kbuild.include
 296
 297# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 298KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 299KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 300export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 301
 302include scripts/subarch.include
 303
 304# Cross compiling and selecting different set of gcc/bin-utils
 305# ---------------------------------------------------------------------------
 306#
 307# When performing cross compilation for other architectures ARCH shall be set
 308# to the target architecture. (See arch/* for the possibilities).
 309# ARCH can be set during invocation of make:
 310# make ARCH=ia64
 311# Another way is to have ARCH set in the environment.
 312# The default ARCH is the host where make is executed.
 313
 314# CROSS_COMPILE specify the prefix used for all executables used
 315# during compilation. Only gcc and related bin-utils executables
 316# are prefixed with $(CROSS_COMPILE).
 317# CROSS_COMPILE can be set on the command line
 318# make CROSS_COMPILE=ia64-linux-
 319# Alternatively CROSS_COMPILE can be set in the environment.
 320# Default value for CROSS_COMPILE is not to prefix executables
 321# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 322ARCH            ?= $(SUBARCH)
 323
 324# Architecture as present in compile.h
 325UTS_MACHINE     := $(ARCH)
 326SRCARCH         := $(ARCH)
 327
 328# Additional ARCH settings for x86
 329ifeq ($(ARCH),i386)
 330        SRCARCH := x86
 331endif
 332ifeq ($(ARCH),x86_64)
 333        SRCARCH := x86
 334endif
 335
 336# Additional ARCH settings for sparc
 337ifeq ($(ARCH),sparc32)
 338       SRCARCH := sparc
 339endif
 340ifeq ($(ARCH),sparc64)
 341       SRCARCH := sparc
 342endif
 343
 344# Additional ARCH settings for sh
 345ifeq ($(ARCH),sh64)
 346       SRCARCH := sh
 347endif
 348
 349KCONFIG_CONFIG  ?= .config
 350export KCONFIG_CONFIG
 351
 352# SHELL used by kbuild
 353CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 354          else if [ -x /bin/bash ]; then echo /bin/bash; \
 355          else echo sh; fi ; fi)
 356
 357HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 358HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 359HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 360
 361HOSTCC       = gcc
 362HOSTCXX      = g++
 363KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 364                -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 365                $(HOSTCFLAGS)
 366KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 367KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 368KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 369
 370# Make variables (CC, etc...)
 371AS              = $(CROSS_COMPILE)as
 372LD              = $(CROSS_COMPILE)ld
 373CC              = $(CROSS_COMPILE)gcc
 374CPP             = $(CC) -E
 375AR              = $(CROSS_COMPILE)ar
 376NM              = $(CROSS_COMPILE)nm
 377STRIP           = $(CROSS_COMPILE)strip
 378OBJCOPY         = $(CROSS_COMPILE)objcopy
 379OBJDUMP         = $(CROSS_COMPILE)objdump
 380LEX             = flex
 381YACC            = bison
 382AWK             = awk
 383GENKSYMS        = scripts/genksyms/genksyms
 384INSTALLKERNEL  := installkernel
 385DEPMOD          = /sbin/depmod
 386PERL            = perl
 387PYTHON          = python
 388PYTHON2         = python2
 389PYTHON3         = python3
 390CHECK           = sparse
 391
 392CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 393                  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 394NOSTDINC_FLAGS  =
 395CFLAGS_MODULE   =
 396AFLAGS_MODULE   =
 397LDFLAGS_MODULE  =
 398CFLAGS_KERNEL   =
 399AFLAGS_KERNEL   =
 400LDFLAGS_vmlinux =
 401
 402# Use USERINCLUDE when you must reference the UAPI directories only.
 403USERINCLUDE    := \
 404                -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 405                -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 406                -I$(srctree)/include/uapi \
 407                -I$(objtree)/include/generated/uapi \
 408                -include $(srctree)/include/linux/kconfig.h
 409
 410# Use LINUXINCLUDE when you must reference the include/ directory.
 411# Needed to be compatible with the O= option
 412LINUXINCLUDE    := \
 413                -I$(srctree)/arch/$(SRCARCH)/include \
 414                -I$(objtree)/arch/$(SRCARCH)/include/generated \
 415                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 416                -I$(objtree)/include \
 417                $(USERINCLUDE)
 418
 419KBUILD_AFLAGS   := -D__ASSEMBLY__
 420KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 421                   -fno-strict-aliasing -fno-common -fshort-wchar \
 422                   -Werror-implicit-function-declaration \
 423                   -Wno-format-security \
 424                   -std=gnu89
 425KBUILD_CPPFLAGS := -D__KERNEL__
 426KBUILD_AFLAGS_KERNEL :=
 427KBUILD_CFLAGS_KERNEL :=
 428KBUILD_AFLAGS_MODULE  := -DMODULE
 429KBUILD_CFLAGS_MODULE  := -DMODULE
 430KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 431KBUILD_LDFLAGS :=
 432GCC_PLUGINS_CFLAGS :=
 433
 434export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 435export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 436export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 437export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 438
 439export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 440export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 441export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 442export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 443export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 444export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 445export KBUILD_ARFLAGS
 446
 447# When compiling out-of-tree modules, put MODVERDIR in the module
 448# tree rather than in the kernel tree. The kernel tree might
 449# even be read-only.
 450export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 451
 452# Files to ignore in find ... statements
 453
 454export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 455                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 456                          -prune -o
 457export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 458                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 459
 460# ===========================================================================
 461# Rules shared between *config targets and build targets
 462
 463# Basic helpers built in scripts/basic/
 464PHONY += scripts_basic
 465scripts_basic:
 466        $(Q)$(MAKE) $(build)=scripts/basic
 467        $(Q)rm -f .tmp_quiet_recordmcount
 468
 469# To avoid any implicit rule to kick in, define an empty command.
 470scripts/basic/%: scripts_basic ;
 471
 472PHONY += outputmakefile
 473# outputmakefile generates a Makefile in the output directory, if using a
 474# separate output directory. This allows convenient use of make in the
 475# output directory.
 476outputmakefile:
 477ifneq ($(KBUILD_SRC),)
 478        $(Q)ln -fsn $(srctree) source
 479        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 480            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 481endif
 482
 483ifeq ($(cc-name),clang)
 484ifneq ($(CROSS_COMPILE),)
 485CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 486GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
 487CLANG_PREFIX    := --prefix=$(GCC_TOOLCHAIN_DIR)
 488GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 489endif
 490ifneq ($(GCC_TOOLCHAIN),)
 491CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 492endif
 493KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
 494KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
 495KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 496KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 497endif
 498
 499RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 500RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 501RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 502RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 503RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 504RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 505export RETPOLINE_CFLAGS
 506export RETPOLINE_VDSO_CFLAGS
 507
 508KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 509KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 510
 511# check for 'asm goto'
 512ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 513  CC_HAVE_ASM_GOTO := 1
 514  KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 515  KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 516endif
 517
 518# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 519# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 520# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 521# and from include/config/auto.conf.cmd to detect the compiler upgrade.
 522CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
 523
 524ifeq ($(config-targets),1)
 525# ===========================================================================
 526# *config targets only - make sure prerequisites are updated, and descend
 527# in scripts/kconfig to make the *config target
 528
 529# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 530# KBUILD_DEFCONFIG may point out an alternative default configuration
 531# used for 'make defconfig'
 532include arch/$(SRCARCH)/Makefile
 533export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 534
 535config: scripts_basic outputmakefile FORCE
 536        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 537
 538%config: scripts_basic outputmakefile FORCE
 539        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 540
 541else
 542# ===========================================================================
 543# Build targets only - this includes vmlinux, arch specific targets, clean
 544# targets and others. In general all targets except *config targets.
 545
 546# If building an external module we do not care about the all: rule
 547# but instead _all depend on modules
 548PHONY += all
 549ifeq ($(KBUILD_EXTMOD),)
 550_all: all
 551else
 552_all: modules
 553endif
 554
 555# Decide whether to build built-in, modular, or both.
 556# Normally, just do built-in.
 557
 558KBUILD_MODULES :=
 559KBUILD_BUILTIN := 1
 560
 561# If we have only "make modules", don't compile built-in objects.
 562# When we're building modules with modversions, we need to consider
 563# the built-in objects during the descend as well, in order to
 564# make sure the checksums are up to date before we record them.
 565
 566ifeq ($(MAKECMDGOALS),modules)
 567  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 568endif
 569
 570# If we have "make <whatever> modules", compile modules
 571# in addition to whatever we do anyway.
 572# Just "make" or "make all" shall build modules as well
 573
 574ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 575  KBUILD_MODULES := 1
 576endif
 577
 578ifeq ($(MAKECMDGOALS),)
 579  KBUILD_MODULES := 1
 580endif
 581
 582export KBUILD_MODULES KBUILD_BUILTIN
 583
 584ifeq ($(KBUILD_EXTMOD),)
 585# Objects we will link into vmlinux / subdirs we need to visit
 586init-y          := init/
 587drivers-y       := drivers/ sound/ firmware/
 588net-y           := net/
 589libs-y          := lib/
 590core-y          := usr/
 591virt-y          := virt/
 592endif # KBUILD_EXTMOD
 593
 594ifeq ($(dot-config),1)
 595include include/config/auto.conf
 596endif
 597
 598# The all: target is the default when no target is given on the
 599# command line.
 600# This allow a user to issue only 'make' to build a kernel including modules
 601# Defaults to vmlinux, but the arch makefile usually adds further targets
 602all: vmlinux
 603
 604CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 605        $(call cc-option,-fno-tree-loop-im) \
 606        $(call cc-disable-warning,maybe-uninitialized,)
 607export CFLAGS_GCOV
 608
 609# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 610ifdef CONFIG_FUNCTION_TRACER
 611  CC_FLAGS_FTRACE := -pg
 612endif
 613
 614# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 615# values of the respective KBUILD_* variables
 616ARCH_CPPFLAGS :=
 617ARCH_AFLAGS :=
 618ARCH_CFLAGS :=
 619include arch/$(SRCARCH)/Makefile
 620
 621ifeq ($(dot-config),1)
 622ifeq ($(may-sync-config),1)
 623# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 624# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 625# because some architectures define CROSS_COMPILE there.
 626-include include/config/auto.conf.cmd
 627
 628# To avoid any implicit rule to kick in, define an empty command
 629$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 630
 631# The actual configuration files used during the build are stored in
 632# include/generated/ and include/config/. Update them if .config is newer than
 633# include/config/auto.conf (which mirrors .config).
 634include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 635        $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 636else
 637# External modules and some install targets need include/generated/autoconf.h
 638# and include/config/auto.conf but do not care if they are up-to-date.
 639# Use auto.conf to trigger the test
 640PHONY += include/config/auto.conf
 641
 642include/config/auto.conf:
 643        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 644        echo >&2;                                                       \
 645        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 646        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 647        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 648        echo >&2 ;                                                      \
 649        /bin/false)
 650
 651endif # may-sync-config
 652endif # $(dot-config)
 653
 654KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 655KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 656KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 657KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 658KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 659
 660ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 661KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 662KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 663else
 664ifdef CONFIG_PROFILE_ALL_BRANCHES
 665KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 666else
 667KBUILD_CFLAGS   += -O2
 668endif
 669endif
 670
 671KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 672                        $(call cc-disable-warning,maybe-uninitialized,))
 673
 674# Tell gcc to never replace conditional load with a non-conditional one
 675KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 676
 677include scripts/Makefile.kcov
 678include scripts/Makefile.gcc-plugins
 679
 680ifdef CONFIG_READABLE_ASM
 681# Disable optimizations that make assembler listings hard to read.
 682# reorder blocks reorders the control in the function
 683# ipa clone creates specialized cloned functions
 684# partial inlining inlines only parts of functions
 685KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 686                 $(call cc-option,-fno-ipa-cp-clone,) \
 687                 $(call cc-option,-fno-partial-inlining)
 688endif
 689
 690ifneq ($(CONFIG_FRAME_WARN),0)
 691KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 692endif
 693
 694stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 695stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 696stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 697
 698KBUILD_CFLAGS += $(stackp-flags-y)
 699
 700ifeq ($(cc-name),clang)
 701KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 702KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 703KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 704KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 705# Quiet clang warning: comparison of unsigned expression < 0 is always false
 706KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 707# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 708# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 709# See modpost pattern 2
 710KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 711KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 712else
 713
 714# These warnings generated too much noise in a regular build.
 715# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 716KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 717endif
 718
 719KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 720ifdef CONFIG_FRAME_POINTER
 721KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 722else
 723# Some targets (ARM with Thumb2, for example), can't be built with frame
 724# pointers.  For those, we don't have FUNCTION_TRACER automatically
 725# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 726# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 727# -fomit-frame-pointer with FUNCTION_TRACER.
 728ifndef CONFIG_FUNCTION_TRACER
 729KBUILD_CFLAGS   += -fomit-frame-pointer
 730endif
 731endif
 732
 733KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 734
 735ifdef CONFIG_DEBUG_INFO
 736ifdef CONFIG_DEBUG_INFO_SPLIT
 737KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 738else
 739KBUILD_CFLAGS   += -g
 740endif
 741KBUILD_AFLAGS   += -Wa,-gdwarf-2
 742endif
 743ifdef CONFIG_DEBUG_INFO_DWARF4
 744KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 745endif
 746
 747ifdef CONFIG_DEBUG_INFO_REDUCED
 748KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 749                   $(call cc-option,-fno-var-tracking)
 750endif
 751
 752ifdef CONFIG_FUNCTION_TRACER
 753ifdef CONFIG_FTRACE_MCOUNT_RECORD
 754  # gcc 5 supports generating the mcount tables directly
 755  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 756    CC_FLAGS_FTRACE     += -mrecord-mcount
 757    export CC_USING_RECORD_MCOUNT := 1
 758  endif
 759  ifdef CONFIG_HAVE_NOP_MCOUNT
 760    ifeq ($(call cc-option-yn, -mnop-mcount),y)
 761      CC_FLAGS_FTRACE   += -mnop-mcount
 762      CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 763    endif
 764  endif
 765endif
 766ifdef CONFIG_HAVE_FENTRY
 767  ifeq ($(call cc-option-yn, -mfentry),y)
 768    CC_FLAGS_FTRACE     += -mfentry
 769    CC_FLAGS_USING      += -DCC_USING_FENTRY
 770  endif
 771endif
 772export CC_FLAGS_FTRACE
 773KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 774KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 775ifdef CONFIG_DYNAMIC_FTRACE
 776        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 777                BUILD_C_RECORDMCOUNT := y
 778                export BUILD_C_RECORDMCOUNT
 779        endif
 780endif
 781endif
 782
 783# We trigger additional mismatches with less inlining
 784ifdef CONFIG_DEBUG_SECTION_MISMATCH
 785KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 786endif
 787
 788ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 789KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 790LDFLAGS_vmlinux += --gc-sections
 791endif
 792
 793# arch Makefile may override CC so keep this after arch Makefile is included
 794NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 795
 796# warn about C99 declaration after statement
 797KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 798
 799# disable pointer signed / unsigned warnings in gcc 4.0
 800KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 801
 802# disable stringop warnings in gcc 8+
 803KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 804
 805# disable invalid "can't wrap" optimizations for signed / pointers
 806KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 807
 808# clang sets -fmerge-all-constants by default as optimization, but this
 809# is non-conforming behavior for C and in fact breaks the kernel, so we
 810# need to disable it here generally.
 811KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 812
 813# for gcc -fno-merge-all-constants disables everything, but it is fine
 814# to have actual conforming behavior enabled.
 815KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 816
 817# Make sure -fstack-check isn't enabled (like gentoo apparently did)
 818KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 819
 820# conserve stack if available
 821KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 822
 823# disallow errors like 'EXPORT_GPL(foo);' with missing header
 824KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 825
 826# require functions to have arguments in prototypes, not empty 'int foo()'
 827KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 828
 829# Prohibit date/time macros, which would make the build non-deterministic
 830KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 831
 832# enforce correct pointer usage
 833KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 834
 835# Require designated initializers for all marked structures
 836KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 837
 838# change __FILE__ to the relative path from the srctree
 839KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 840
 841# use the deterministic mode of AR if available
 842KBUILD_ARFLAGS := $(call ar-option,D)
 843
 844include scripts/Makefile.kasan
 845include scripts/Makefile.extrawarn
 846include scripts/Makefile.ubsan
 847
 848# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 849# last assignments
 850KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 851KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 852KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 853
 854# Use --build-id when available.
 855LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 856KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 857LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 858
 859ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 860LDFLAGS_vmlinux += $(call ld-option, -X,)
 861endif
 862
 863# insure the checker run with the right endianness
 864CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 865
 866# the checker needs the correct machine size
 867CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 868
 869# Default kernel image to build when no specific target is given.
 870# KBUILD_IMAGE may be overruled on the command line or
 871# set in the environment
 872# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 873# this default value
 874export KBUILD_IMAGE ?= vmlinux
 875
 876#
 877# INSTALL_PATH specifies where to place the updated kernel and system map
 878# images. Default is /boot, but you can set it to other values
 879export  INSTALL_PATH ?= /boot
 880
 881#
 882# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 883# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 884# an argument if needed. Otherwise it defaults to the kernel install path
 885#
 886export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 887
 888#
 889# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 890# relocations required by build roots.  This is not defined in the
 891# makefile but the argument can be passed to make if needed.
 892#
 893
 894MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 895export MODLIB
 896
 897#
 898# INSTALL_MOD_STRIP, if defined, will cause modules to be
 899# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 900# the default option --strip-debug will be used.  Otherwise,
 901# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 902
 903ifdef INSTALL_MOD_STRIP
 904ifeq ($(INSTALL_MOD_STRIP),1)
 905mod_strip_cmd = $(STRIP) --strip-debug
 906else
 907mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 908endif # INSTALL_MOD_STRIP=1
 909else
 910mod_strip_cmd = true
 911endif # INSTALL_MOD_STRIP
 912export mod_strip_cmd
 913
 914# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 915# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 916# or CONFIG_MODULE_COMPRESS_XZ.
 917
 918mod_compress_cmd = true
 919ifdef CONFIG_MODULE_COMPRESS
 920  ifdef CONFIG_MODULE_COMPRESS_GZIP
 921    mod_compress_cmd = gzip -n -f
 922  endif # CONFIG_MODULE_COMPRESS_GZIP
 923  ifdef CONFIG_MODULE_COMPRESS_XZ
 924    mod_compress_cmd = xz -f
 925  endif # CONFIG_MODULE_COMPRESS_XZ
 926endif # CONFIG_MODULE_COMPRESS
 927export mod_compress_cmd
 928
 929# Select initial ramdisk compression format, default is gzip(1).
 930# This shall be used by the dracut(8) tool while creating an initramfs image.
 931#
 932INITRD_COMPRESS-y                  := gzip
 933INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 934INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 935INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 936INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 937INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 938# do not export INITRD_COMPRESS, since we didn't actually
 939# choose a sane default compression above.
 940# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 941
 942ifdef CONFIG_MODULE_SIG_ALL
 943$(eval $(call config_filename,MODULE_SIG_KEY))
 944
 945mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 946else
 947mod_sign_cmd = true
 948endif
 949export mod_sign_cmd
 950
 951ifdef CONFIG_STACK_VALIDATION
 952  has_libelf := $(call try-run,\
 953                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 954  ifeq ($(has_libelf),1)
 955    objtool_target := tools/objtool FORCE
 956  else
 957    ifdef CONFIG_UNWINDER_ORC
 958      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 959    else
 960      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 961    endif
 962    SKIP_STACK_VALIDATION := 1
 963    export SKIP_STACK_VALIDATION
 964  endif
 965endif
 966
 967
 968ifeq ($(KBUILD_EXTMOD),)
 969core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 970
 971vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 972                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 973                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 974
 975vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 976                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 977
 978init-y          := $(patsubst %/, %/built-in.a, $(init-y))
 979core-y          := $(patsubst %/, %/built-in.a, $(core-y))
 980drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
 981net-y           := $(patsubst %/, %/built-in.a, $(net-y))
 982libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 983libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
 984virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
 985
 986# Externally visible symbols (used by link-vmlinux.sh)
 987export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 988export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 989export KBUILD_VMLINUX_LIBS := $(libs-y1)
 990export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 991export LDFLAGS_vmlinux
 992# used by scripts/package/Makefile
 993export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 994
 995vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 996
 997# Recurse until adjust_autoksyms.sh is satisfied
 998PHONY += autoksyms_recursive
 999autoksyms_recursive: $(vmlinux-deps)
1000ifdef CONFIG_TRIM_UNUSED_KSYMS
1001        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1002          "$(MAKE) -f $(srctree)/Makefile vmlinux"
1003endif
1004
1005# For the kernel to actually contain only the needed exported symbols,
1006# we have to build modules as well to determine what those symbols are.
1007# (this can be evaluated only once include/config/auto.conf has been included)
1008ifdef CONFIG_TRIM_UNUSED_KSYMS
1009  KBUILD_MODULES := 1
1010endif
1011
1012autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1013
1014$(autoksyms_h):
1015        $(Q)mkdir -p $(dir $@)
1016        $(Q)touch $@
1017
1018ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1019
1020# Final link of vmlinux with optional arch pass after final link
1021cmd_link-vmlinux =                                                 \
1022        $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1023        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1024
1025vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1026ifdef CONFIG_HEADERS_CHECK
1027        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1028endif
1029ifdef CONFIG_GDB_SCRIPTS
1030        $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1031endif
1032        +$(call if_changed,link-vmlinux)
1033
1034# Build samples along the rest of the kernel. This needs headers_install.
1035ifdef CONFIG_SAMPLES
1036vmlinux-dirs += samples
1037samples: headers_install
1038endif
1039
1040# The actual objects are generated when descending,
1041# make sure no implicit rule kicks in
1042$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1043
1044# Handle descending into subdirectories listed in $(vmlinux-dirs)
1045# Preset locale variables to speed up the build process. Limit locale
1046# tweaks to this spot to avoid wrong language settings when running
1047# make menuconfig etc.
1048# Error messages still appears in the original language
1049
1050PHONY += $(vmlinux-dirs)
1051$(vmlinux-dirs): prepare scripts
1052        $(Q)$(MAKE) $(build)=$@ need-builtin=1
1053
1054define filechk_kernel.release
1055        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1056endef
1057
1058# Store (new) KERNELRELEASE string in include/config/kernel.release
1059include/config/kernel.release: $(srctree)/Makefile FORCE
1060        $(call filechk,kernel.release)
1061
1062# Additional helpers built in scripts/
1063# Carefully list dependencies so we do not try to build scripts twice
1064# in parallel
1065PHONY += scripts
1066scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
1067        $(Q)$(MAKE) $(build)=$(@)
1068
1069# Things we need to do before we recursively start building the kernel
1070# or the modules are listed in "prepare".
1071# A multi level approach is used. prepareN is processed before prepareN-1.
1072# archprepare is used in arch Makefiles and when processed asm symlink,
1073# version.h and scripts_basic is processed / created.
1074
1075# Listed in dependency order
1076PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1077
1078# prepare3 is used to check if we are building in a separate output directory,
1079# and if so do:
1080# 1) Check that make has not been executed in the kernel src $(srctree)
1081prepare3: include/config/kernel.release
1082ifneq ($(KBUILD_SRC),)
1083        @$(kecho) '  Using $(srctree) as source for kernel'
1084        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1085                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1086                echo >&2 "  in the '$(srctree)' directory.";\
1087                /bin/false; \
1088        fi;
1089endif
1090
1091# prepare2 creates a makefile if using a separate output directory.
1092# From this point forward, .config has been reprocessed, so any rules
1093# that need to depend on updated CONFIG_* values can be checked here.
1094prepare2: prepare3 outputmakefile asm-generic
1095
1096prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1097        $(cmd_crmodverdir)
1098
1099archprepare: archheaders archscripts prepare1 scripts_basic
1100
1101prepare0: archprepare gcc-plugins
1102        $(Q)$(MAKE) $(build)=.
1103
1104# All the preparing..
1105prepare: prepare0 prepare-objtool
1106
1107# Support for using generic headers in asm-generic
1108PHONY += asm-generic uapi-asm-generic
1109asm-generic: uapi-asm-generic
1110        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1111                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
1112uapi-asm-generic:
1113        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1114                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1115
1116PHONY += prepare-objtool
1117prepare-objtool: $(objtool_target)
1118
1119# Generate some files
1120# ---------------------------------------------------------------------------
1121
1122# KERNELRELEASE can change from a few different places, meaning version.h
1123# needs to be updated, so this check is forced on all builds
1124
1125uts_len := 64
1126define filechk_utsrelease.h
1127        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1128          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1129          exit 1;                                                         \
1130        fi;                                                               \
1131        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1132endef
1133
1134define filechk_version.h
1135        (echo \#define LINUX_VERSION_CODE $(shell                         \
1136        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1137        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1138endef
1139
1140$(version_h): FORCE
1141        $(call filechk,version.h)
1142        $(Q)rm -f $(old_version_h)
1143
1144include/generated/utsrelease.h: include/config/kernel.release FORCE
1145        $(call filechk,utsrelease.h)
1146
1147PHONY += headerdep
1148headerdep:
1149        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1150        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1151
1152# ---------------------------------------------------------------------------
1153# Kernel headers
1154
1155#Default location for installed headers
1156export INSTALL_HDR_PATH = $(objtree)/usr
1157
1158# If we do an all arch process set dst to include/arch-$(SRCARCH)
1159hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1160
1161PHONY += archheaders
1162archheaders:
1163
1164PHONY += archscripts
1165archscripts:
1166
1167PHONY += __headers
1168__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1169        $(Q)$(MAKE) $(build)=scripts build_unifdef
1170
1171PHONY += headers_install_all
1172headers_install_all:
1173        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1174
1175PHONY += headers_install
1176headers_install: __headers
1177        $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1178          $(error Headers not exportable for the $(SRCARCH) architecture))
1179        $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1180        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1181
1182PHONY += headers_check_all
1183headers_check_all: headers_install_all
1184        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1185
1186PHONY += headers_check
1187headers_check: headers_install
1188        $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1189        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1190
1191# ---------------------------------------------------------------------------
1192# Kernel selftest
1193
1194PHONY += kselftest
1195kselftest:
1196        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1197
1198PHONY += kselftest-clean
1199kselftest-clean:
1200        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1201
1202PHONY += kselftest-merge
1203kselftest-merge:
1204        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1205        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1206                -m $(objtree)/.config \
1207                $(srctree)/tools/testing/selftests/*/config
1208        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1209
1210# ---------------------------------------------------------------------------
1211# Modules
1212
1213ifdef CONFIG_MODULES
1214
1215# By default, build modules as well
1216
1217all: modules
1218
1219# Build modules
1220#
1221# A module can be listed more than once in obj-m resulting in
1222# duplicate lines in modules.order files.  Those are removed
1223# using awk while concatenating to the final file.
1224
1225PHONY += modules
1226modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1227        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1228        @$(kecho) '  Building modules, stage 2.';
1229        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1230
1231modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1232        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1233
1234%/modules.builtin: include/config/auto.conf include/config/tristate.conf
1235        $(Q)$(MAKE) $(modbuiltin)=$*
1236
1237
1238# Target to prepare building external modules
1239PHONY += modules_prepare
1240modules_prepare: prepare scripts
1241
1242# Target to install modules
1243PHONY += modules_install
1244modules_install: _modinst_ _modinst_post
1245
1246PHONY += _modinst_
1247_modinst_:
1248        @rm -rf $(MODLIB)/kernel
1249        @rm -f $(MODLIB)/source
1250        @mkdir -p $(MODLIB)/kernel
1251        @ln -s $(abspath $(srctree)) $(MODLIB)/source
1252        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1253                rm -f $(MODLIB)/build ; \
1254                ln -s $(CURDIR) $(MODLIB)/build ; \
1255        fi
1256        @cp -f $(objtree)/modules.order $(MODLIB)/
1257        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1258        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1259
1260# This depmod is only for convenience to give the initial
1261# boot a modules.dep even before / is mounted read-write.  However the
1262# boot script depmod is the master version.
1263PHONY += _modinst_post
1264_modinst_post: _modinst_
1265        $(call cmd,depmod)
1266
1267ifeq ($(CONFIG_MODULE_SIG), y)
1268PHONY += modules_sign
1269modules_sign:
1270        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1271endif
1272
1273else # CONFIG_MODULES
1274
1275# Modules not configured
1276# ---------------------------------------------------------------------------
1277
1278PHONY += modules modules_install
1279modules modules_install:
1280        @echo >&2
1281        @echo >&2 "The present kernel configuration has modules disabled."
1282        @echo >&2 "Type 'make config' and enable loadable module support."
1283        @echo >&2 "Then build a kernel with module support enabled."
1284        @echo >&2
1285        @exit 1
1286
1287endif # CONFIG_MODULES
1288
1289###
1290# Cleaning is done on three levels.
1291# make clean     Delete most generated files
1292#                Leave enough to build external modules
1293# make mrproper  Delete the current configuration, and all generated files
1294# make distclean Remove editor backup files, patch leftover files and the like
1295
1296# Directories & files removed with 'make clean'
1297CLEAN_DIRS  += $(MODVERDIR) include/ksym
1298
1299# Directories & files removed with 'make mrproper'
1300MRPROPER_DIRS  += include/config usr/include include/generated          \
1301                  arch/*/include/generated .tmp_objdiff
1302MRPROPER_FILES += .config .config.old .version \
1303                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1304                  signing_key.pem signing_key.priv signing_key.x509     \
1305                  x509.genkey extra_certificates signing_key.x509.keyid \
1306                  signing_key.x509.signer vmlinux-gdb.py
1307
1308# clean - Delete most, but leave enough to build external modules
1309#
1310clean: rm-dirs  := $(CLEAN_DIRS)
1311clean: rm-files := $(CLEAN_FILES)
1312clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1313
1314PHONY += $(clean-dirs) clean archclean vmlinuxclean
1315$(clean-dirs):
1316        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1317
1318vmlinuxclean:
1319        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1320        $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1321
1322clean: archclean vmlinuxclean
1323
1324# mrproper - Delete all generated files, including .config
1325#
1326mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1327mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1328mrproper-dirs      := $(addprefix _mrproper_,scripts)
1329
1330PHONY += $(mrproper-dirs) mrproper archmrproper
1331$(mrproper-dirs):
1332        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1333
1334mrproper: clean archmrproper $(mrproper-dirs)
1335        $(call cmd,rmdirs)
1336        $(call cmd,rmfiles)
1337
1338# distclean
1339#
1340PHONY += distclean
1341
1342distclean: mrproper
1343        @find $(srctree) $(RCS_FIND_IGNORE) \
1344                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1345                -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1346                -o -name 'core' \) \
1347                -type f -print | xargs rm -f
1348
1349
1350# Packaging of the kernel to various formats
1351# ---------------------------------------------------------------------------
1352package-dir     := scripts/package
1353
1354%src-pkg: FORCE
1355        $(Q)$(MAKE) $(build)=$(package-dir) $@
1356%pkg: include/config/kernel.release FORCE
1357        $(Q)$(MAKE) $(build)=$(package-dir) $@
1358
1359
1360# Brief documentation of the typical targets used
1361# ---------------------------------------------------------------------------
1362
1363boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1364boards := $(sort $(notdir $(boards)))
1365board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1366board-dirs := $(sort $(notdir $(board-dirs:/=)))
1367
1368PHONY += help
1369help:
1370        @echo  'Cleaning targets:'
1371        @echo  '  clean           - Remove most generated files but keep the config and'
1372        @echo  '                    enough build support to build external modules'
1373        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1374        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1375        @echo  ''
1376        @echo  'Configuration targets:'
1377        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1378        @echo  ''
1379        @echo  'Other generic targets:'
1380        @echo  '  all             - Build all targets marked with [*]'
1381        @echo  '* vmlinux         - Build the bare kernel'
1382        @echo  '* modules         - Build all modules'
1383        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1384        @echo  '  dir/            - Build all files in dir and below'
1385        @echo  '  dir/file.[ois]  - Build specified target only'
1386        @echo  '  dir/file.ll     - Build the LLVM assembly file'
1387        @echo  '                    (requires compiler support for LLVM assembly generation)'
1388        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1389        @echo  '                    (requires a recent binutils and recent build (System.map))'
1390        @echo  '  dir/file.ko     - Build module including final link'
1391        @echo  '  modules_prepare - Set up for building external modules'
1392        @echo  '  tags/TAGS       - Generate tags file for editors'
1393        @echo  '  cscope          - Generate cscope index'
1394        @echo  '  gtags           - Generate GNU GLOBAL index'
1395        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1396        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1397        @echo  '  image_name      - Output the image name (use with make -s)'
1398        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1399         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1400         echo  ''
1401        @echo  'Static analysers:'
1402        @echo  '  checkstack      - Generate a list of stack hogs'
1403        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1404        @echo  '  versioncheck    - Sanity check on version.h usage'
1405        @echo  '  includecheck    - Check for duplicate included header files'
1406        @echo  '  export_report   - List the usages of all exported symbols'
1407        @echo  '  headers_check   - Sanity check on exported headers'
1408        @echo  '  headerdep       - Detect inclusion cycles in headers'
1409        @echo  '  coccicheck      - Check with Coccinelle'
1410        @echo  ''
1411        @echo  'Kernel selftest:'
1412        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1413        @echo  '                    Build, install, and boot kernel before'
1414        @echo  '                    running kselftest on it'
1415        @echo  '  kselftest-clean - Remove all generated kselftest files'
1416        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1417        @echo  '                    .config.'
1418        @echo  ''
1419        @echo 'Userspace tools targets:'
1420        @echo '  use "make tools/help"'
1421        @echo '  or  "cd tools; make help"'
1422        @echo  ''
1423        @echo  'Kernel packaging:'
1424        @$(MAKE) $(build)=$(package-dir) help
1425        @echo  ''
1426        @echo  'Documentation targets:'
1427        @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1428        @echo  ''
1429        @echo  'Architecture specific targets ($(SRCARCH)):'
1430        @$(if $(archhelp),$(archhelp),\
1431                echo '  No architecture specific help defined for $(SRCARCH)')
1432        @echo  ''
1433        @$(if $(boards), \
1434                $(foreach b, $(boards), \
1435                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1436                echo '')
1437        @$(if $(board-dirs), \
1438                $(foreach b, $(board-dirs), \
1439                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1440                printf "  %-16s - Show all of the above\\n" help-boards; \
1441                echo '')
1442
1443        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1444        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1445        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1446        @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1447        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1448        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1449        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1450        @echo  '                1: warnings which may be relevant and do not occur too often'
1451        @echo  '                2: warnings which occur quite often but may still be relevant'
1452        @echo  '                3: more obscure warnings, can most likely be ignored'
1453        @echo  '                Multiple levels can be combined with W=12 or W=123'
1454        @echo  ''
1455        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1456        @echo  'For further info see the ./README file'
1457
1458
1459help-board-dirs := $(addprefix help-,$(board-dirs))
1460
1461help-boards: $(help-board-dirs)
1462
1463boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1464
1465$(help-board-dirs): help-%:
1466        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1467        @$(if $(boards-per-dir), \
1468                $(foreach b, $(boards-per-dir), \
1469                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1470                echo '')
1471
1472
1473# Documentation targets
1474# ---------------------------------------------------------------------------
1475DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1476               linkcheckdocs dochelp refcheckdocs
1477PHONY += $(DOC_TARGETS)
1478$(DOC_TARGETS): scripts_basic FORCE
1479        $(Q)$(MAKE) $(build)=Documentation $@
1480
1481else # KBUILD_EXTMOD
1482
1483###
1484# External module support.
1485# When building external modules the kernel used as basis is considered
1486# read-only, and no consistency checks are made and the make
1487# system is not used on the basis kernel. If updates are required
1488# in the basis kernel ordinary make commands (without M=...) must
1489# be used.
1490#
1491# The following are the only valid targets when building external
1492# modules.
1493# make M=dir clean     Delete all automatically generated files
1494# make M=dir modules   Make all modules in specified dir
1495# make M=dir           Same as 'make M=dir modules'
1496# make M=dir modules_install
1497#                      Install the modules built in the module directory
1498#                      Assumes install directory is already created
1499
1500# We are always building modules
1501KBUILD_MODULES := 1
1502PHONY += crmodverdir
1503crmodverdir:
1504        $(cmd_crmodverdir)
1505
1506PHONY += $(objtree)/Module.symvers
1507$(objtree)/Module.symvers:
1508        @test -e $(objtree)/Module.symvers || ( \
1509        echo; \
1510        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1511        echo "           is missing; modules will have no dependencies and modversions."; \
1512        echo )
1513
1514module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1515PHONY += $(module-dirs) modules
1516$(module-dirs): crmodverdir $(objtree)/Module.symvers
1517        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1518
1519modules: $(module-dirs)
1520        @$(kecho) '  Building modules, stage 2.';
1521        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1522
1523PHONY += modules_install
1524modules_install: _emodinst_ _emodinst_post
1525
1526install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1527PHONY += _emodinst_
1528_emodinst_:
1529        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1530        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1531
1532PHONY += _emodinst_post
1533_emodinst_post: _emodinst_
1534        $(call cmd,depmod)
1535
1536clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1537
1538PHONY += $(clean-dirs) clean
1539$(clean-dirs):
1540        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1541
1542clean:  rm-dirs := $(MODVERDIR)
1543clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1544
1545PHONY += help
1546help:
1547        @echo  '  Building external modules.'
1548        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1549        @echo  ''
1550        @echo  '  modules         - default target, build the module(s)'
1551        @echo  '  modules_install - install the module'
1552        @echo  '  clean           - remove generated files in module directory only'
1553        @echo  ''
1554
1555# Dummies...
1556PHONY += prepare scripts
1557prepare: ;
1558scripts: ;
1559endif # KBUILD_EXTMOD
1560
1561clean: $(clean-dirs)
1562        $(call cmd,rmdirs)
1563        $(call cmd,rmfiles)
1564        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1565                \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1566                -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1567                -o -name '*.dwo' -o -name '*.lst' \
1568                -o -name '*.su'  \
1569                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1570                -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1571                -o -name '*.asn1.[ch]' \
1572                -o -name '*.symtypes' -o -name 'modules.order' \
1573                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1574                -o -name '*.c.[012]*.*' \
1575                -o -name '*.ll' \
1576                -o -name '*.gcno' \) -type f -print | xargs rm -f
1577
1578# Generate tags for editors
1579# ---------------------------------------------------------------------------
1580quiet_cmd_tags = GEN     $@
1581      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1582
1583tags TAGS cscope gtags: FORCE
1584        $(call cmd,tags)
1585
1586# Scripts to check various things for consistency
1587# ---------------------------------------------------------------------------
1588
1589PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1590
1591includecheck:
1592        find $(srctree)/* $(RCS_FIND_IGNORE) \
1593                -name '*.[hcS]' -type f -print | sort \
1594                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1595
1596versioncheck:
1597        find $(srctree)/* $(RCS_FIND_IGNORE) \
1598                -name '*.[hcS]' -type f -print | sort \
1599                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1600
1601coccicheck:
1602        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1603
1604namespacecheck:
1605        $(PERL) $(srctree)/scripts/namespace.pl
1606
1607export_report:
1608        $(PERL) $(srctree)/scripts/export_report.pl
1609
1610endif #ifeq ($(config-targets),1)
1611endif #ifeq ($(mixed-targets),1)
1612
1613PHONY += checkstack kernelrelease kernelversion image_name
1614
1615# UML needs a little special treatment here.  It wants to use the host
1616# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1617# else wants $(ARCH), including people doing cross-builds, which means
1618# that $(SUBARCH) doesn't work here.
1619ifeq ($(ARCH), um)
1620CHECKSTACK_ARCH := $(SUBARCH)
1621else
1622CHECKSTACK_ARCH := $(ARCH)
1623endif
1624checkstack:
1625        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1626        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1627
1628kernelrelease:
1629        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1630
1631kernelversion:
1632        @echo $(KERNELVERSION)
1633
1634image_name:
1635        @echo $(KBUILD_IMAGE)
1636
1637# Clear a bunch of variables before executing the submake
1638tools/: FORCE
1639        $(Q)mkdir -p $(objtree)/tools
1640        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1641
1642tools/%: FORCE
1643        $(Q)mkdir -p $(objtree)/tools
1644        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1645
1646# Single targets
1647# ---------------------------------------------------------------------------
1648# Single targets are compatible with:
1649# - build with mixed source and output
1650# - build with separate output dir 'make O=...'
1651# - external modules
1652#
1653#  target-dir => where to store outputfile
1654#  build-dir  => directory in kernel source tree to use
1655
1656ifeq ($(KBUILD_EXTMOD),)
1657        build-dir  = $(patsubst %/,%,$(dir $@))
1658        target-dir = $(dir $@)
1659else
1660        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1661        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1662        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1663endif
1664
1665%.s: %.c prepare scripts FORCE
1666        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1667%.i: %.c prepare scripts FORCE
1668        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1669%.o: %.c prepare scripts FORCE
1670        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1671%.lst: %.c prepare scripts FORCE
1672        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1673%.s: %.S prepare scripts FORCE
1674        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675%.o: %.S prepare scripts FORCE
1676        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677%.symtypes: %.c prepare scripts FORCE
1678        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679%.ll: %.c prepare scripts FORCE
1680        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681
1682# Modules
1683/: prepare scripts FORCE
1684        $(cmd_crmodverdir)
1685        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1686        $(build)=$(build-dir)
1687# Make sure the latest headers are built for Documentation
1688Documentation/ samples/: headers_install
1689%/: prepare scripts FORCE
1690        $(cmd_crmodverdir)
1691        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1692        $(build)=$(build-dir)
1693%.ko: prepare scripts FORCE
1694        $(cmd_crmodverdir)
1695        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1696        $(build)=$(build-dir) $(@:.ko=.o)
1697        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1698
1699# FIXME Should go into a make.lib or something
1700# ===========================================================================
1701
1702quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1703      cmd_rmdirs = rm -rf $(rm-dirs)
1704
1705quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1706      cmd_rmfiles = rm -f $(rm-files)
1707
1708# Run depmod only if we have System.map and depmod is executable
1709quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1710      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1711                   $(KERNELRELEASE)
1712
1713# Create temporary dir for module support files
1714# clean it up only when building all modules
1715cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1716                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1717
1718# read all saved command lines
1719
1720cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1721
1722ifneq ($(cmd_files),)
1723  $(cmd_files): ;       # Do not try to update included dependency files
1724  include $(cmd_files)
1725endif
1726
1727endif   # skip-makefile
1728
1729PHONY += FORCE
1730FORCE:
1731
1732# Declare the contents of the PHONY variable as phony.  We keep that
1733# information in a variable so we can use it in if_changed and friends.
1734.PHONY: $(PHONY)
1735